CA2700289A1 - Position detection device and method for detecting at least two positions - Google Patents
Position detection device and method for detecting at least two positions Download PDFInfo
- Publication number
- CA2700289A1 CA2700289A1 CA2700289A CA2700289A CA2700289A1 CA 2700289 A1 CA2700289 A1 CA 2700289A1 CA 2700289 A CA2700289 A CA 2700289A CA 2700289 A CA2700289 A CA 2700289A CA 2700289 A1 CA2700289 A1 CA 2700289A1
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- Prior art keywords
- syringe
- die
- switching device
- detection device
- position detection
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims description 32
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 25
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 description 24
- 238000002347 injection Methods 0.000 description 15
- 239000007924 injection Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 8
- 210000004204 blood vessel Anatomy 0.000 description 5
- 230000005291 magnetic effect Effects 0.000 description 4
- 239000011796 hollow space material Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 210000002105 tongue Anatomy 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
- A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/026—Measuring blood flow
- A61B5/0275—Measuring blood flow using tracers, e.g. dye dilution
- A61B5/028—Measuring blood flow using tracers, e.g. dye dilution by thermo-dilution
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31501—Means for blocking or restricting the movement of the rod or piston
- A61M2005/31508—Means for blocking or restricting the movement of the rod or piston provided on the piston-rod
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3379—Masses, volumes, levels of fluids in reservoirs, flow rates
- A61M2205/3382—Upper level detectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3379—Masses, volumes, levels of fluids in reservoirs, flow rates
- A61M2205/3386—Low level detectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
- A61M5/1684—Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
- A61M5/1684—Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion
- A61M5/1685—Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion by detection of position of a floating member
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31501—Means for blocking or restricting the movement of the rod or piston
- A61M5/31505—Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
- A61M5/31561—Mechanically operated dose setting member using freely adjustable volume steps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31545—Setting modes for dosing
- A61M5/31548—Mechanically operated dose setting member
- A61M5/31563—Mechanically operated dose setting member interacting with a displaceable stop member
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
- A61M5/3159—Dose expelling manners
- A61M5/31591—Single dose, i.e. individually set dose administered only once from the same medicament reservoir, e.g. including single stroke limiting means
Landscapes
- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention relates to a position detection device (10) for detecting at least a first and a second position of a syringe plunger (20) relative to the syringe barrel (25) of a syringe, comprising at least three switching devices (40, 50, 60), wherein at least one switching device is configured as a reed contact, and at least one switching device is configured as a magnet.
Description
POSITION DETECTION DEVICE AND METHOD FOR DETECTING AT LEAST TWO
POSITIONS
The invention relates to a position detection device and to a method for detecting at least two positions. The invention relates particularly to a position detection device for detecting at least a first and a second position of a syringe die as well as to a method for detecting at least two positions of a syringe die with respect to the syringe body of a syringe.
In thermodilution, it is necessary to inject a predefined volume of liquid, and to determine the change of this injected volume after the duration of the passage through the vessels to be measured. From the difference of the two detected volumes, parameters concerning the vessels are then determined. An important prerequisite here is that the administered volume, just like the time it took to administer the volume, is detected.
In DE 699 17 425 T2, an injection channel intended for a blood vessel catheter, and presenting a temperature sensor, is described. A flow rate switch and/or a pressure switch is/are connected electrically to the output of the temperature sensor.
However, in interpreting a bolus whose properties were determined after passage through a blood vessel and/or the heart, conclusions may be drawn here that deviate from reality. This is due to the fact that it is possible to administer a bolus that deviates from an intended bolus, and to use the data that were measured after the passage of this bolus through a blood vessel and/or the heart as the basis of the interpretation.
From this results the problem of providing a position detection device and a method by means of which the above-mentioned problem can be avoided.
This problem is solved particularly by a position detection device for detecting a first and a second position of a syringe die with respect to the syringe body of a syringe, which comprises at least two switching devices, where at least one switching device is configured as a reed contact and at least one switching device is configured as a magnet.
A position detection device is preferably a device that is capable of detecting at least one position, preferably a position of a syringe die.
A syringe is preferably a medical instrument that can be used to administer liquid substances. The syringe consists preferably of a preferably cylindrical syringe body, a syringe die that can be used in it, and a preferably conical nozzle. The syringe can be filled preferably by drawing the syringe die up. It is preferably possible to press a fluid through the nozzle by applying pressure to the syringe die.
A first position of the syringe die is preferably a position that the syringe die assumes when there is fluid in the syringe body.
A second position of a syringe die is preferably a position that the syringe die assumes when no hollow space is present between the syringe body and the syringe die that is capable of receiving a fluid.
Switching devices are preferably devices that are capable of detecting positions. It is preferred for the switching devices to be devices which are arranged to close an electric circuit when a certain position relative to another switching device has been reached. It is preferred to use a microswitch as switching device. A microswitch is preferably an electrical switch whose contacts in the open state are separated by a separation of less than 3 mm from each other. It is preferred to use a switching device as normally closed contact, particularly preferably as normally open contact. It is particularly preferred to use a reed contact.
Reed contacts are preferably contact tongues that have been melted under a vacuum or protective gas into a glass piston. The contact tongues are manufactured preferably from a ferromagnetic material that has been coated with a noble metal. Contact actuation occurs preferably by means of a magnetic field that acts from the exterior.
As magnet, it is preferred to use a device that is capable of generating a magnetic field. It is preferred to use a magnetic coil or an electromagnet, particularly advantageously a permanent magnet.
It is preferred for the syringe die to be arranged in a sheathing that prevents, for example, germs from reaching the syringe die, and thus entering the fluid to be injected.
It is preferred for a temperature sensor to be arranged in the syringe. It is particularly preferred for the temperature sensor to be arranged in the area of the nozzle.
It is preferred for the syringe die to be connected to an automatic actuation device that is capable of moving the syringe die upon a signal of the processing apparatus.
Such an automatic actuation device can be motor driven, for example, or it can be used via gas or fluid controlled drive mechanisms, in order to automatically draw up the syringe and inject the bolus. It is particularly preferred for the syringe to be received for this purpose in a carriage which is driven by an appropriate motor, and which can draw up the syringe to a first position, and then empty the syringe in a predefined time window, thereby injecting a bolus.
It is preferred for two of the switching devices to be arranged in a fixed position with respect to the syringe body. As a result, it is possible to detect two positions of the syringe die in a simple way. It is preferred for the switching devices which are arranged in a fixed position with respect to the syringe body to be configured as reed contacts. It is preferred to design the third switching device as a magnet, and to arrange it in such a way that at least two positions of the magnet correspond to two positions of the syringe die. As a result it is possible to obtain a first signal for a first position of the syringe die from the first positionally fixed switching device, and a second signal for a second position of the syringe die from the second positionally fixed switching device.
It is preferred to arrange two of the switching devices so they can be moved with respect to the syringe body. As a result, it is possible to detect two positions of the syringe die in a particularly cost advantageous way. It is preferred for the two switching devices that are movable with respect to the syringe body to be in a fixed body with respect to the syringe die. It is particularly advantageous for the two movable switching devices to be arranged in such a way that each one of the switching devices can assume at least one position that corresponds to a position of the syringe die. It is particularly preferred for the two switching devices which are arranged in a movable way with respect to the syringe body to be configured as magnets. It is particularly preferred for an additional switching device to be arranged in a fixed position with respect to the syringe body and to be configured as a reed contact. It is particularly preferred to connect the syringe die to a carriage on which the two switching devices which are arranged so they can be moved with respect to the syringe body are attached. As a result, it is possible, in a simple way, to provide switching devices which are in a fixed position with respect to the syringe die, without having to modify the syringe itself.
It is preferred for the second position of the syringe die to be the position in which the syringe die is located immediately after emptying the syringe. As a result, it is possible to detect the position that the syringe die assumes after emptying the syringe.
It is preferably possible to determine the time it takes for the syringe die to assume the second position.
It is preferred to be able to set a first switching device in a fixed position in a first area which corresponds to a first position of the syringe die. As a result, it is possible to provide different first positions for the syringe die. As a result, it is possible to provide injections of different volumes. The first positionally fixed switching device can preferably be adjusted in the first area. As a result, it is possible to provide several injections, without having to newly install the first positionally fixed switching device.
It is preferable possible to adjust a separation between at least one movable switching device and at least one positionally fixed switching device. As a result, it is possible to predetermine the sensitivity of the actuation of a switching device. It is preferred for the switching devices to be arranged in such a way that they can be actuated when they face each other. It is preferred for the switching devices to respond with greater precision the smaller the provided separation between a movable and a positionally fixed switching device is.
It is preferred for at least one switching device to have magnetizable plastic. As a result it is possible to integrate a switching device in a syringe in a particularly simple way. At least a part of the syringe die is preferably made from a magnetizable plastic. As a result, it is possible to provide a switching device on the syringe die, in a simple way.
It is preferred for the magnetizable plastic to be capable of being processed by the usual processing techniques applied in plastics technology. It is particularly preferred for the magnetic plastic to be capable of assuming nearly any shape. It is particularly preferred for the metal part that is in the material to be magnetizable.
It is preferred for the position detection device to comprise a latch that is arranged in such a way that it restricts the draw up piston stroke of the syringe die. As a result, it is possible, in a simple way, to prevent drawing up excess fluid with the syringe.
The draw up piston stroke is preferably the path that the syringe die travels during the draw up piston stroke of the syringe.
The latch is preferably a device that is capable of preventing further drawing up of the syringe die starting at a defined position of the syringe die relative to the syringe body. It is preferred for the latch to present a mechanical abutment which is connected in a fixed position to the syringe body. It is preferred for the position of the latch to be adjustable relative to the syringe body, so that it is possible to predetermine different draw up piston strokes, and thus different volumes, of the fluid in the syringe. It is preferable that the syringe die can be connected to the latch. As a result, it is possible to bring the syringe die into a certain position with particular precision. It is preferred for the latch to be arranged in such a way that a syringe die can be connected to it, and the syringe die and latch can be moved up to a predefined position relative to the syringe body. It is preferred for the position of the latch to be detectable. It is particularly preferred for the position of the latch to be detectable by a switching device. It is preferable to be able to perform a control of a drawn up fluid quantity.
It is particularly preferred for the latch to be provided in a carriage into which the syringe can be inserted. After the insertion of the syringe into a carriage, the latter can firmly hold the syringe body, and lock the syringe die in a movable part of the carriage part. In this way it is possible to move, by the movement of the carriage, the syringe or the syringe die relative to the syringe body. On this carriage system, a latch can now be provided preferably, so that the carriage system can be moved only up to a certain predetermined position. In this way, it is thus only possible to draw up the syringe to this predetermined position. As a result of the integration of the reed contacts or of the magnets in this external carriage system, they can be used with any syringes, so that commercial syringes can be inserted from the sterile packaging into the carriage system, and no modifications on an existing syringe or the syringe die are required.
It is preferred for the latch to be connectable to a positionally fixed switching device. As a result, it is possible to detect the actuation of the latch. It is preferred for the latch to be connectable to the first positionally fixed switching device. As a result, it is possible to avoid providing a separate switching device for the detection of the actuation of the latch. It is preferred for the actuation of the latch, and also the departure of the syringe die from the area in which the latch is actuated, to be detectable with the first positionally fixed switching device. It is preferred for the connection of the latch to the positionally fixed switching device to be a logical connection. It is particularly preferred for the connection of the latch to the positionally fixed switching device to be a mechanical connection. It is preferred for the latch and the first positionally fixed switching device to be movable jointly.
It is preferable that moving the latch or moving the first positionally fixed switching device in each case also moves the first positionally fixed switching device or the latch. It is preferable that the latch and the first positionally fixed switching device can be adjustable jointly. As a result, a detected position is the position in which the syringe die has been pulled out of the syringe body to a maximum.
It is preferred for the latch to present a bevel which is oriented in such a way that a force is transmitted into the syringe die, which force does not act in the actuation direction of the syringe die when the position sensor is not connected to the syringe die, and a pressure is exerted on the syringe die. As a result, it is possible to prevent injection of a fluid when the syringe die is not in a predetermined first position. In this way, one can prevent the injection of an unintended quantity of fluid.
It is preferred to deflect by means of the bevel the force that is exerted for the injections on the syringe die, particularly a portion of this force, in a direction that does not correspond to the actuation direction of the syringe die.
It is preferably possible to connect the position detection device to a syringe. As a result, it is possible to prevent the syringe from being actuated when there is no detection of the positions of the syringe die.
It is preferred for the syringe to be connected in a detachable way to the position detection device, so that the syringe can be replaced.
It is preferred for the position detection device to present a carriage which is connected to at least one switching device, and which can be connected to the syringe die. As a result, it is possible, in a simple way, to provide a position detection device such that a position of the syringe die can be detected without modifying the syringe die itself. It is preferred for the carriage to be in a fixed position with respect to the syringe die. It is preferred for the carriage to be movable in the longitudinal direction of the syringe body.
It is preferred for the position detection device to present a syringe receiver which is arranged to receive a syringe body. As a result, it is possible, in a simple way, to connect a syringe to the position detection device.
It is preferred for the syringe receiver to present an area that is configured as a hollow cylinder. It is preferable possible to receive a syringe body of a commercial syringe in a syringe receiver. It is preferred for the syringe body to be connectable to the syringe receiver;
POSITIONS
The invention relates to a position detection device and to a method for detecting at least two positions. The invention relates particularly to a position detection device for detecting at least a first and a second position of a syringe die as well as to a method for detecting at least two positions of a syringe die with respect to the syringe body of a syringe.
In thermodilution, it is necessary to inject a predefined volume of liquid, and to determine the change of this injected volume after the duration of the passage through the vessels to be measured. From the difference of the two detected volumes, parameters concerning the vessels are then determined. An important prerequisite here is that the administered volume, just like the time it took to administer the volume, is detected.
In DE 699 17 425 T2, an injection channel intended for a blood vessel catheter, and presenting a temperature sensor, is described. A flow rate switch and/or a pressure switch is/are connected electrically to the output of the temperature sensor.
However, in interpreting a bolus whose properties were determined after passage through a blood vessel and/or the heart, conclusions may be drawn here that deviate from reality. This is due to the fact that it is possible to administer a bolus that deviates from an intended bolus, and to use the data that were measured after the passage of this bolus through a blood vessel and/or the heart as the basis of the interpretation.
From this results the problem of providing a position detection device and a method by means of which the above-mentioned problem can be avoided.
This problem is solved particularly by a position detection device for detecting a first and a second position of a syringe die with respect to the syringe body of a syringe, which comprises at least two switching devices, where at least one switching device is configured as a reed contact and at least one switching device is configured as a magnet.
A position detection device is preferably a device that is capable of detecting at least one position, preferably a position of a syringe die.
A syringe is preferably a medical instrument that can be used to administer liquid substances. The syringe consists preferably of a preferably cylindrical syringe body, a syringe die that can be used in it, and a preferably conical nozzle. The syringe can be filled preferably by drawing the syringe die up. It is preferably possible to press a fluid through the nozzle by applying pressure to the syringe die.
A first position of the syringe die is preferably a position that the syringe die assumes when there is fluid in the syringe body.
A second position of a syringe die is preferably a position that the syringe die assumes when no hollow space is present between the syringe body and the syringe die that is capable of receiving a fluid.
Switching devices are preferably devices that are capable of detecting positions. It is preferred for the switching devices to be devices which are arranged to close an electric circuit when a certain position relative to another switching device has been reached. It is preferred to use a microswitch as switching device. A microswitch is preferably an electrical switch whose contacts in the open state are separated by a separation of less than 3 mm from each other. It is preferred to use a switching device as normally closed contact, particularly preferably as normally open contact. It is particularly preferred to use a reed contact.
Reed contacts are preferably contact tongues that have been melted under a vacuum or protective gas into a glass piston. The contact tongues are manufactured preferably from a ferromagnetic material that has been coated with a noble metal. Contact actuation occurs preferably by means of a magnetic field that acts from the exterior.
As magnet, it is preferred to use a device that is capable of generating a magnetic field. It is preferred to use a magnetic coil or an electromagnet, particularly advantageously a permanent magnet.
It is preferred for the syringe die to be arranged in a sheathing that prevents, for example, germs from reaching the syringe die, and thus entering the fluid to be injected.
It is preferred for a temperature sensor to be arranged in the syringe. It is particularly preferred for the temperature sensor to be arranged in the area of the nozzle.
It is preferred for the syringe die to be connected to an automatic actuation device that is capable of moving the syringe die upon a signal of the processing apparatus.
Such an automatic actuation device can be motor driven, for example, or it can be used via gas or fluid controlled drive mechanisms, in order to automatically draw up the syringe and inject the bolus. It is particularly preferred for the syringe to be received for this purpose in a carriage which is driven by an appropriate motor, and which can draw up the syringe to a first position, and then empty the syringe in a predefined time window, thereby injecting a bolus.
It is preferred for two of the switching devices to be arranged in a fixed position with respect to the syringe body. As a result, it is possible to detect two positions of the syringe die in a simple way. It is preferred for the switching devices which are arranged in a fixed position with respect to the syringe body to be configured as reed contacts. It is preferred to design the third switching device as a magnet, and to arrange it in such a way that at least two positions of the magnet correspond to two positions of the syringe die. As a result it is possible to obtain a first signal for a first position of the syringe die from the first positionally fixed switching device, and a second signal for a second position of the syringe die from the second positionally fixed switching device.
It is preferred to arrange two of the switching devices so they can be moved with respect to the syringe body. As a result, it is possible to detect two positions of the syringe die in a particularly cost advantageous way. It is preferred for the two switching devices that are movable with respect to the syringe body to be in a fixed body with respect to the syringe die. It is particularly advantageous for the two movable switching devices to be arranged in such a way that each one of the switching devices can assume at least one position that corresponds to a position of the syringe die. It is particularly preferred for the two switching devices which are arranged in a movable way with respect to the syringe body to be configured as magnets. It is particularly preferred for an additional switching device to be arranged in a fixed position with respect to the syringe body and to be configured as a reed contact. It is particularly preferred to connect the syringe die to a carriage on which the two switching devices which are arranged so they can be moved with respect to the syringe body are attached. As a result, it is possible, in a simple way, to provide switching devices which are in a fixed position with respect to the syringe die, without having to modify the syringe itself.
It is preferred for the second position of the syringe die to be the position in which the syringe die is located immediately after emptying the syringe. As a result, it is possible to detect the position that the syringe die assumes after emptying the syringe.
It is preferably possible to determine the time it takes for the syringe die to assume the second position.
It is preferred to be able to set a first switching device in a fixed position in a first area which corresponds to a first position of the syringe die. As a result, it is possible to provide different first positions for the syringe die. As a result, it is possible to provide injections of different volumes. The first positionally fixed switching device can preferably be adjusted in the first area. As a result, it is possible to provide several injections, without having to newly install the first positionally fixed switching device.
It is preferable possible to adjust a separation between at least one movable switching device and at least one positionally fixed switching device. As a result, it is possible to predetermine the sensitivity of the actuation of a switching device. It is preferred for the switching devices to be arranged in such a way that they can be actuated when they face each other. It is preferred for the switching devices to respond with greater precision the smaller the provided separation between a movable and a positionally fixed switching device is.
It is preferred for at least one switching device to have magnetizable plastic. As a result it is possible to integrate a switching device in a syringe in a particularly simple way. At least a part of the syringe die is preferably made from a magnetizable plastic. As a result, it is possible to provide a switching device on the syringe die, in a simple way.
It is preferred for the magnetizable plastic to be capable of being processed by the usual processing techniques applied in plastics technology. It is particularly preferred for the magnetic plastic to be capable of assuming nearly any shape. It is particularly preferred for the metal part that is in the material to be magnetizable.
It is preferred for the position detection device to comprise a latch that is arranged in such a way that it restricts the draw up piston stroke of the syringe die. As a result, it is possible, in a simple way, to prevent drawing up excess fluid with the syringe.
The draw up piston stroke is preferably the path that the syringe die travels during the draw up piston stroke of the syringe.
The latch is preferably a device that is capable of preventing further drawing up of the syringe die starting at a defined position of the syringe die relative to the syringe body. It is preferred for the latch to present a mechanical abutment which is connected in a fixed position to the syringe body. It is preferred for the position of the latch to be adjustable relative to the syringe body, so that it is possible to predetermine different draw up piston strokes, and thus different volumes, of the fluid in the syringe. It is preferable that the syringe die can be connected to the latch. As a result, it is possible to bring the syringe die into a certain position with particular precision. It is preferred for the latch to be arranged in such a way that a syringe die can be connected to it, and the syringe die and latch can be moved up to a predefined position relative to the syringe body. It is preferred for the position of the latch to be detectable. It is particularly preferred for the position of the latch to be detectable by a switching device. It is preferable to be able to perform a control of a drawn up fluid quantity.
It is particularly preferred for the latch to be provided in a carriage into which the syringe can be inserted. After the insertion of the syringe into a carriage, the latter can firmly hold the syringe body, and lock the syringe die in a movable part of the carriage part. In this way it is possible to move, by the movement of the carriage, the syringe or the syringe die relative to the syringe body. On this carriage system, a latch can now be provided preferably, so that the carriage system can be moved only up to a certain predetermined position. In this way, it is thus only possible to draw up the syringe to this predetermined position. As a result of the integration of the reed contacts or of the magnets in this external carriage system, they can be used with any syringes, so that commercial syringes can be inserted from the sterile packaging into the carriage system, and no modifications on an existing syringe or the syringe die are required.
It is preferred for the latch to be connectable to a positionally fixed switching device. As a result, it is possible to detect the actuation of the latch. It is preferred for the latch to be connectable to the first positionally fixed switching device. As a result, it is possible to avoid providing a separate switching device for the detection of the actuation of the latch. It is preferred for the actuation of the latch, and also the departure of the syringe die from the area in which the latch is actuated, to be detectable with the first positionally fixed switching device. It is preferred for the connection of the latch to the positionally fixed switching device to be a logical connection. It is particularly preferred for the connection of the latch to the positionally fixed switching device to be a mechanical connection. It is preferred for the latch and the first positionally fixed switching device to be movable jointly.
It is preferable that moving the latch or moving the first positionally fixed switching device in each case also moves the first positionally fixed switching device or the latch. It is preferable that the latch and the first positionally fixed switching device can be adjustable jointly. As a result, a detected position is the position in which the syringe die has been pulled out of the syringe body to a maximum.
It is preferred for the latch to present a bevel which is oriented in such a way that a force is transmitted into the syringe die, which force does not act in the actuation direction of the syringe die when the position sensor is not connected to the syringe die, and a pressure is exerted on the syringe die. As a result, it is possible to prevent injection of a fluid when the syringe die is not in a predetermined first position. In this way, one can prevent the injection of an unintended quantity of fluid.
It is preferred to deflect by means of the bevel the force that is exerted for the injections on the syringe die, particularly a portion of this force, in a direction that does not correspond to the actuation direction of the syringe die.
It is preferably possible to connect the position detection device to a syringe. As a result, it is possible to prevent the syringe from being actuated when there is no detection of the positions of the syringe die.
It is preferred for the syringe to be connected in a detachable way to the position detection device, so that the syringe can be replaced.
It is preferred for the position detection device to present a carriage which is connected to at least one switching device, and which can be connected to the syringe die. As a result, it is possible, in a simple way, to provide a position detection device such that a position of the syringe die can be detected without modifying the syringe die itself. It is preferred for the carriage to be in a fixed position with respect to the syringe die. It is preferred for the carriage to be movable in the longitudinal direction of the syringe body.
It is preferred for the position detection device to present a syringe receiver which is arranged to receive a syringe body. As a result, it is possible, in a simple way, to connect a syringe to the position detection device.
It is preferred for the syringe receiver to present an area that is configured as a hollow cylinder. It is preferable possible to receive a syringe body of a commercial syringe in a syringe receiver. It is preferred for the syringe body to be connectable to the syringe receiver;
it is particularly preferred for a syringe body to be connectable in a detachable way to the syringe receiver. It is preferred for the syringe receiver to be dimensioned in such a way that a syringe body of a commercial syringe can be connected to it with positive connection.
It is preferred to use a method for detecting at least two positions of a syringe die relative the syringe body of a syringe which comprises the following steps:
drawing up into the syringe, detection of the first position of the syringe die, detection of the point in time when the syringe die leaves the first position, pressing of the content of the syringe through a nozzle of the syringe, detection of a second position of the syringe die and of the point in time when the syringe die has reached the second position, and processing of the first position and second position, and of the points in time when the first and second position of the syringe die are detected, in a processing apparatus..
A nozzle is any device that is capable of allowing fluid to exit from a syringe.
A point in time is any time tag that allows a comparison with other time tags.
It is preferred for a point in time to be a time tag that makes it possible to determine a separation with respect to other points in time. It is particularly preferred for a point in time to be a clock time.
The processing of the first position and the second position, and of the points in time of the detected first position and second position of the syringe die, in a processing apparatus, comprises preferably a determination of the extension and temperature of an injected bolus.
It is particularly preferred for this processing to allow a prediction of the time when the bolus will occur at a certain place of a blood vessel, particularly preferably a prediction of the length, and preferably of the temperature, of this bolus. It is preferred for the processing to comprise the calculation of how the temperature and/or extension of the bolus change/ s during the passage through the heart.
It is preferred to use a method for detecting at least two positions of a syringe die relative the syringe body of a syringe which comprises the following steps:
drawing up into the syringe, detection of the first position of the syringe die, detection of the point in time when the syringe die leaves the first position, pressing of the content of the syringe through a nozzle of the syringe, detection of a second position of the syringe die and of the point in time when the syringe die has reached the second position, and processing of the first position and second position, and of the points in time when the first and second position of the syringe die are detected, in a processing apparatus..
A nozzle is any device that is capable of allowing fluid to exit from a syringe.
A point in time is any time tag that allows a comparison with other time tags.
It is preferred for a point in time to be a time tag that makes it possible to determine a separation with respect to other points in time. It is particularly preferred for a point in time to be a clock time.
The processing of the first position and the second position, and of the points in time of the detected first position and second position of the syringe die, in a processing apparatus, comprises preferably a determination of the extension and temperature of an injected bolus.
It is particularly preferred for this processing to allow a prediction of the time when the bolus will occur at a certain place of a blood vessel, particularly preferably a prediction of the length, and preferably of the temperature, of this bolus. It is preferred for the processing to comprise the calculation of how the temperature and/or extension of the bolus change/ s during the passage through the heart.
Moreover, it is preferred for the method to comprise the process steps:
connection of the position detection device to the syringe, and setting of the first positionally fixed switching device. As a result, it is possible to install the position detection device in such a way that a bolus can be drawn up with the syringe and injected repeatedly, without having to proceed to any adjustments on the position detection device.
The connection of the position detection device to the syringe is preferably a detachable connection, so that the syringe can be replaced. The setting of the first positionally fixed switch position is preferably a setting of a first positionally fixed switching device to a certain position that corresponds preferably to a volume to be injected.
Moreover, it is preferred for the method to comprise the process step: setting of the second positionally fixed switching device. As a result, it is possible to detect an end point of an injection. It is preferred for the second positionally fixed switching device to be set in an area that corresponds to a position of the syringe die in which no volume for fluid is present between the syringe die and the syringe body.
Moreover, it is preferred for the method to comprise the process step:
stopping of the drawing up into the syringe. As a result, it is possible to draw up a defined volume. The stopping preferably comprises locking of the syringe die. The drawing up into the syringe comprises preferably a movement of the syringe die relative to the syringe body such that a volume is formed between the syringe die and the syringe body, into which the fluid flows in through a nozzle. It is preferred for the syringe die to be reached by abutment against an abutment that is provided in a fixed position with respect to the syringe body.
Moreover, it is preferred for the method to comprise the process step:
emission of a signal, when the duration between the time when a first position of the syringe die has been reached, and the time when a second position of the syringe die has been reached, is too short or too long and/or when the latch that has been arranged to delimit a draw up piston stroke of the syringe die has not been activated.
A signal is any sign that is capable of informing a user and/or a processing apparatus that no injection according to the specification has taken place. It is preferred to elaborate a signal that is processed by a processing apparatus in such a way that measured data are discarded.
It is preferred for a signal to be an optical, particularly preferably, an acoustic signal.
connection of the position detection device to the syringe, and setting of the first positionally fixed switching device. As a result, it is possible to install the position detection device in such a way that a bolus can be drawn up with the syringe and injected repeatedly, without having to proceed to any adjustments on the position detection device.
The connection of the position detection device to the syringe is preferably a detachable connection, so that the syringe can be replaced. The setting of the first positionally fixed switch position is preferably a setting of a first positionally fixed switching device to a certain position that corresponds preferably to a volume to be injected.
Moreover, it is preferred for the method to comprise the process step: setting of the second positionally fixed switching device. As a result, it is possible to detect an end point of an injection. It is preferred for the second positionally fixed switching device to be set in an area that corresponds to a position of the syringe die in which no volume for fluid is present between the syringe die and the syringe body.
Moreover, it is preferred for the method to comprise the process step:
stopping of the drawing up into the syringe. As a result, it is possible to draw up a defined volume. The stopping preferably comprises locking of the syringe die. The drawing up into the syringe comprises preferably a movement of the syringe die relative to the syringe body such that a volume is formed between the syringe die and the syringe body, into which the fluid flows in through a nozzle. It is preferred for the syringe die to be reached by abutment against an abutment that is provided in a fixed position with respect to the syringe body.
Moreover, it is preferred for the method to comprise the process step:
emission of a signal, when the duration between the time when a first position of the syringe die has been reached, and the time when a second position of the syringe die has been reached, is too short or too long and/or when the latch that has been arranged to delimit a draw up piston stroke of the syringe die has not been activated.
A signal is any sign that is capable of informing a user and/or a processing apparatus that no injection according to the specification has taken place. It is preferred to elaborate a signal that is processed by a processing apparatus in such a way that measured data are discarded.
It is preferred for a signal to be an optical, particularly preferably, an acoustic signal.
Moreover, it is preferred for the method to comprise the process step:
delivery of the region in which the second positionally fixed switching device is positioned, to a processing apparatus. As a result, it is possible to provide the processing apparatus with information regarding the quantity of the fluid to be injected.
It is preferred to enter the area manually into the processing apparatus. It is particularly preferred for the position detection device to present switches which are arranged in such a way that they detect the position of the second positionally fixed switching device, and deliver it to the processing apparatus.
Moreover, it is preferred for the method to comprise the process step:
calculation of the volume that has been injected between the time when the first position is left, and the time when the second position is reached. As a result, it is possible to provide the processing apparatus in a simple way with information regarding the injected volume.
It is preferred for the processing apparatus to have available a list in which the different volumes are assigned to different positions; it is particularly preferred for the processing apparatus to have available a calculation instruction by means of which it can calculate from the first position and from the second position a corresponding volume. It is particularly preferred to calculate the constitution of a bolus. For this purpose, it is preferred to calculate the extension, particularly preferably the temperature of the bolus.
Preferred embodiments of the invention are explained in greater detail below in reference to the drawing in the appendix. The figures show:
Figure 1 a diagram of an embodiment example of a position detection device according to the invention, Figures 2A-2E diagrams of an embodiment example of a position detection device according to the invention, where in each one of Figures 2A-2E, another phase is shown in the use of the position detection device, Figures 3A-3E diagrams of an embodiment example of an additional position detection device, where in Figures 3A-3E, different phases are shown in the use of the position detection device, Figure 4 a diagram of an embodiment example of a syringe receiver and a carriage, and Figure 5 a diagram of an additional embodiment example of a position detection device.
Figure 1 shows a schematic cross section of an embodiment example of a position detection device 10 according to the invention. In addition, Figure 1 shows the cross section of a syringe 30 with a syringe body 25 and a syringe die 20. The syringe body 25 is configured as a cylindrical hollow body, in which the syringe die 20 is arranged so it is moved in such a way that a hollow space can be generated in the syringe body 25, which is capable of holding fluid. The syringe 20 presents a nozzle 35 which is connected to a tube 80. The tube 80 presents a first tube area 81 which can be connected to a pouch. Between the first tube area 81 and the nozzle 35, the first valve 82 is arranged. The tube 80 presents a second tube area 83 which can be connected to a catheter. Between the second tube area 83 and the nozzle 35, a second valve 84 is arranged. The syringe die 20 presents a piston section 22, which is arranged for the purpose of closing off a hollow space with the syringe body 25, and a handle 21 which is capable of transmitting a force, which a user exerts on it, to the piston section 22.
A carriage 45 is connected in such a way to the handle 21 that it is positionally fixed relative to the syringe die 20. The carriage, moreover, extends outside of the syringe body 25 in the same direction as the syringe die 20. It is movable relative to the syringe body 25. At the height of the piston section 22, a switching device 40 is provided on the carriage 45.
In a positionally fixed way relative to the syringe body 25, two switching devices 50 and 60 are arranged in different areas outside of the syringe body 25, in such a way that the switching device 40, when the syringe die 20 is actuated, can be moved past the switching devices 50 and 60. The switching devices 50 and 60 present in each case a data line leading to the processing device 70.
Pulling the handle 21 of the syringe die 20 generates a low pressure in the nozzle 35, by means of which the first valve 82 can be opened, and fluid can be sucked out of a pouch through the first tube area 81 into the syringe body 25. By pressing the handle 21 of the syringe die 20, fluid can be pushed through the nozzle 35 into the tube 80. As a result, an excess pressure develops in the tube 80, by means of which the second valve 84 is opened, and the fluid can be led through the second tube area 83 to the catheter. When the syringe die 20 is moved, the carriage 45 attached to the handle 21 is also moved together with the switching device 40. The switching device 60 is arranged in such a way that it faces the switching device 40, when the syringe die 20 is pushed completely into the syringe body 25.
The switching device 50 is arranged in a position in which it faces the switching device 40, when the piston section 22 is positioned in an area that corresponds to the volume to be injected. As a result, it is possible to detect both a predetermined starting position as well as a final position of the syringe die 20. In the embodiment shown here, the switching device 40 is configured as a magnet. The switching devices 50 and 60 are configured as reed contacts.
As a result, there is a separate position signal for the two positions of the syringe die 20.
The position detection device 10 shown in Figure 1 makes it possible to control, in the processing apparatus 70, whether a fluid volume has been delivered as intended. When the switching device 50 has not issued a signal to the processing apparatus 70, the fluid injection is rejected as not according to specification. When the switching device 60 has not delivered a signal to the processing apparatus 70, the fluid injection is also rejected as not according to specification. In the first case, it can be assumed that the syringe has not been drawn up sufficiently; in the second case, one can assume that the syringe has not been emptied completely. In addition, it is possible to reject injections as not according to specification if the time elapsed between the input of a signal from the switching device 50, and the input of a signal from the switching device 60 is too short or too long. In both cases, a bolus administration according to specification has not been achieved. In addition, it is possible to make precise statements regarding the constitution of the bolus, because both the information on its volume and the information on the start and the end of the injection time are available. Therefore, the measurements of the bolus after passage through the blood vessels and/or heart can be interpreted with greater precision.
In Figures 2A-2E, an embodiment example of a position detection device according to the invention is shown in different phases. The position detection device 10 and syringe 30 are configured in a way similar to that shown in Figure 1; however, the switching device 40 is arranged directly on the piston section 22, and it is formed from a magnetizable plastic.
In Figure 2A, the piston section 22 is located directly on the nozzle 35.
Between the piston section 22 and the piston body 25, there is no volume capable of receiving fluid. The switching device 40 faces the switching device 60. As a result, the switching device 60 generates a signal.
In Figure 2B, the syringe die 20 is pulled slightly out of the syringe body 25. The switching device 40 faces neither the switching device 60 nor the switching device 50.
As a result, none of the switching devices 50 or 60 generates a signal.
In Figure 2C, the syringe die 20 has been pulled slightly further out of the syringe body 25.
The switching device 40 faces the switching device 50. As a result, the switching device 50 generates a signal. Figure 2C shows the start position for an injection of a bolus. The syringe 30 has been drawn up.
In Figure 2D, the syringe die 20 has been pushed in the direction of a nozzle 35. The switching device 40 neither faces the switching device 50 nor the switching device 60. Figure 2D shows the injection phase. Neither the switching device 50 nor the switching device 60 generates a signal.
In Figure 2E, the syringe die 20 has been pushed completely into the syringe body 25. The switching device 40 faces the switching device 60. The switching device 60 generates a signal.
Since the switching devices 50 and 60 are configured as reed contacts, and the switching device 40 is configured as a magnet, two different signals are generated for the two possible positions. As a result, it is possible to assign the signals with precision to the positions.
Figures 3A-3E show the diagram of an additional embodiment example of a position detection device and of an additional syringe. In contrast to the position detection device 10 shown in Figures 2A-2E and the shown syringe 30, a switching device 40 is provided in a positionally fixed way relative to the syringe body 25 on the syringe body. In addition, two switching devices 50 and 60 that are configured as magnets are provided on the syringe die 20.
In Figure 3A, the piston section 22 of the piston die 20 lies against the nozzle 35. Between the piston section 22 and the syringe body 25, there is no volume present that is capable of receiving fluid. The switching device 50 faces the switching device 40. The switching device 40 generates a signal.
delivery of the region in which the second positionally fixed switching device is positioned, to a processing apparatus. As a result, it is possible to provide the processing apparatus with information regarding the quantity of the fluid to be injected.
It is preferred to enter the area manually into the processing apparatus. It is particularly preferred for the position detection device to present switches which are arranged in such a way that they detect the position of the second positionally fixed switching device, and deliver it to the processing apparatus.
Moreover, it is preferred for the method to comprise the process step:
calculation of the volume that has been injected between the time when the first position is left, and the time when the second position is reached. As a result, it is possible to provide the processing apparatus in a simple way with information regarding the injected volume.
It is preferred for the processing apparatus to have available a list in which the different volumes are assigned to different positions; it is particularly preferred for the processing apparatus to have available a calculation instruction by means of which it can calculate from the first position and from the second position a corresponding volume. It is particularly preferred to calculate the constitution of a bolus. For this purpose, it is preferred to calculate the extension, particularly preferably the temperature of the bolus.
Preferred embodiments of the invention are explained in greater detail below in reference to the drawing in the appendix. The figures show:
Figure 1 a diagram of an embodiment example of a position detection device according to the invention, Figures 2A-2E diagrams of an embodiment example of a position detection device according to the invention, where in each one of Figures 2A-2E, another phase is shown in the use of the position detection device, Figures 3A-3E diagrams of an embodiment example of an additional position detection device, where in Figures 3A-3E, different phases are shown in the use of the position detection device, Figure 4 a diagram of an embodiment example of a syringe receiver and a carriage, and Figure 5 a diagram of an additional embodiment example of a position detection device.
Figure 1 shows a schematic cross section of an embodiment example of a position detection device 10 according to the invention. In addition, Figure 1 shows the cross section of a syringe 30 with a syringe body 25 and a syringe die 20. The syringe body 25 is configured as a cylindrical hollow body, in which the syringe die 20 is arranged so it is moved in such a way that a hollow space can be generated in the syringe body 25, which is capable of holding fluid. The syringe 20 presents a nozzle 35 which is connected to a tube 80. The tube 80 presents a first tube area 81 which can be connected to a pouch. Between the first tube area 81 and the nozzle 35, the first valve 82 is arranged. The tube 80 presents a second tube area 83 which can be connected to a catheter. Between the second tube area 83 and the nozzle 35, a second valve 84 is arranged. The syringe die 20 presents a piston section 22, which is arranged for the purpose of closing off a hollow space with the syringe body 25, and a handle 21 which is capable of transmitting a force, which a user exerts on it, to the piston section 22.
A carriage 45 is connected in such a way to the handle 21 that it is positionally fixed relative to the syringe die 20. The carriage, moreover, extends outside of the syringe body 25 in the same direction as the syringe die 20. It is movable relative to the syringe body 25. At the height of the piston section 22, a switching device 40 is provided on the carriage 45.
In a positionally fixed way relative to the syringe body 25, two switching devices 50 and 60 are arranged in different areas outside of the syringe body 25, in such a way that the switching device 40, when the syringe die 20 is actuated, can be moved past the switching devices 50 and 60. The switching devices 50 and 60 present in each case a data line leading to the processing device 70.
Pulling the handle 21 of the syringe die 20 generates a low pressure in the nozzle 35, by means of which the first valve 82 can be opened, and fluid can be sucked out of a pouch through the first tube area 81 into the syringe body 25. By pressing the handle 21 of the syringe die 20, fluid can be pushed through the nozzle 35 into the tube 80. As a result, an excess pressure develops in the tube 80, by means of which the second valve 84 is opened, and the fluid can be led through the second tube area 83 to the catheter. When the syringe die 20 is moved, the carriage 45 attached to the handle 21 is also moved together with the switching device 40. The switching device 60 is arranged in such a way that it faces the switching device 40, when the syringe die 20 is pushed completely into the syringe body 25.
The switching device 50 is arranged in a position in which it faces the switching device 40, when the piston section 22 is positioned in an area that corresponds to the volume to be injected. As a result, it is possible to detect both a predetermined starting position as well as a final position of the syringe die 20. In the embodiment shown here, the switching device 40 is configured as a magnet. The switching devices 50 and 60 are configured as reed contacts.
As a result, there is a separate position signal for the two positions of the syringe die 20.
The position detection device 10 shown in Figure 1 makes it possible to control, in the processing apparatus 70, whether a fluid volume has been delivered as intended. When the switching device 50 has not issued a signal to the processing apparatus 70, the fluid injection is rejected as not according to specification. When the switching device 60 has not delivered a signal to the processing apparatus 70, the fluid injection is also rejected as not according to specification. In the first case, it can be assumed that the syringe has not been drawn up sufficiently; in the second case, one can assume that the syringe has not been emptied completely. In addition, it is possible to reject injections as not according to specification if the time elapsed between the input of a signal from the switching device 50, and the input of a signal from the switching device 60 is too short or too long. In both cases, a bolus administration according to specification has not been achieved. In addition, it is possible to make precise statements regarding the constitution of the bolus, because both the information on its volume and the information on the start and the end of the injection time are available. Therefore, the measurements of the bolus after passage through the blood vessels and/or heart can be interpreted with greater precision.
In Figures 2A-2E, an embodiment example of a position detection device according to the invention is shown in different phases. The position detection device 10 and syringe 30 are configured in a way similar to that shown in Figure 1; however, the switching device 40 is arranged directly on the piston section 22, and it is formed from a magnetizable plastic.
In Figure 2A, the piston section 22 is located directly on the nozzle 35.
Between the piston section 22 and the piston body 25, there is no volume capable of receiving fluid. The switching device 40 faces the switching device 60. As a result, the switching device 60 generates a signal.
In Figure 2B, the syringe die 20 is pulled slightly out of the syringe body 25. The switching device 40 faces neither the switching device 60 nor the switching device 50.
As a result, none of the switching devices 50 or 60 generates a signal.
In Figure 2C, the syringe die 20 has been pulled slightly further out of the syringe body 25.
The switching device 40 faces the switching device 50. As a result, the switching device 50 generates a signal. Figure 2C shows the start position for an injection of a bolus. The syringe 30 has been drawn up.
In Figure 2D, the syringe die 20 has been pushed in the direction of a nozzle 35. The switching device 40 neither faces the switching device 50 nor the switching device 60. Figure 2D shows the injection phase. Neither the switching device 50 nor the switching device 60 generates a signal.
In Figure 2E, the syringe die 20 has been pushed completely into the syringe body 25. The switching device 40 faces the switching device 60. The switching device 60 generates a signal.
Since the switching devices 50 and 60 are configured as reed contacts, and the switching device 40 is configured as a magnet, two different signals are generated for the two possible positions. As a result, it is possible to assign the signals with precision to the positions.
Figures 3A-3E show the diagram of an additional embodiment example of a position detection device and of an additional syringe. In contrast to the position detection device 10 shown in Figures 2A-2E and the shown syringe 30, a switching device 40 is provided in a positionally fixed way relative to the syringe body 25 on the syringe body. In addition, two switching devices 50 and 60 that are configured as magnets are provided on the syringe die 20.
In Figure 3A, the piston section 22 of the piston die 20 lies against the nozzle 35. Between the piston section 22 and the syringe body 25, there is no volume present that is capable of receiving fluid. The switching device 50 faces the switching device 40. The switching device 40 generates a signal.
In Figure 3B, the syringe die 20 is pulled out by a first distance out of the syringe body 25.
The switching device 40 faces neither the switching device 50 nor the switching device 60.
The switching device 40 generates no signal.
In Figure 3C, the syringe die 20 has been pulled out by an additional distance out of the syringe body 25. The switching device 60 faces the switching device 40. The switching device 40 generates a signal. The syringe die 20 is located in the starting position for an injection.
In Figure 3D, the syringe die 20 has been pushed in by a distance in the direction of the nozzle 35. Fluid has been pushed through the nozzle 35. Neither the switching device 50 nor the switching device 60 faces the switching device 40. The switching device 40 generates no signal.
In Figure 3E, the syringe die 20 has been pushed completely into the syringe body 25. The switching device 50 faces the switching device 40. The switching device 40 generates a signal.
Since the switching device 40 generates a signal in the case of both positions to be detected, it is possible to generate the signal particularly cost effectively.
Figure 4 shows a diagram of an embodiment example of a syringe receiver 90 and a carriage 45. Moreover, a commercial syringe 30 is shown, whose syringe body 25 is received in the syringe receiver 90, and whose handle 21 is connected in a positionally fixed way to the carriage 45.
The carriage 45 presents a connection area which is connected detachably to the handle 21.
To the connection area, a switch area is connected, which extends in the form of a rod parallel to the syringe die 20. At the height of the piston section 22, the switch area presents a permanent magnet 40.
The syringe receiver 90 presents a first area, which is configured as a hollow cylinder, so that the syringe body 25 can be received in it. Furthermore, the syringe receiver 90 presents a second area, which is also configured in the form of a hollow cylinder. In this second area of the syringe receiver 90, the second area of the carriage 45 has been received in a movable way. In this second area of the syringe area 90, the first reed contact 50 and the second reed contact 60 are positioned.
The switching device 40 faces neither the switching device 50 nor the switching device 60.
The switching device 40 generates no signal.
In Figure 3C, the syringe die 20 has been pulled out by an additional distance out of the syringe body 25. The switching device 60 faces the switching device 40. The switching device 40 generates a signal. The syringe die 20 is located in the starting position for an injection.
In Figure 3D, the syringe die 20 has been pushed in by a distance in the direction of the nozzle 35. Fluid has been pushed through the nozzle 35. Neither the switching device 50 nor the switching device 60 faces the switching device 40. The switching device 40 generates no signal.
In Figure 3E, the syringe die 20 has been pushed completely into the syringe body 25. The switching device 50 faces the switching device 40. The switching device 40 generates a signal.
Since the switching device 40 generates a signal in the case of both positions to be detected, it is possible to generate the signal particularly cost effectively.
Figure 4 shows a diagram of an embodiment example of a syringe receiver 90 and a carriage 45. Moreover, a commercial syringe 30 is shown, whose syringe body 25 is received in the syringe receiver 90, and whose handle 21 is connected in a positionally fixed way to the carriage 45.
The carriage 45 presents a connection area which is connected detachably to the handle 21.
To the connection area, a switch area is connected, which extends in the form of a rod parallel to the syringe die 20. At the height of the piston section 22, the switch area presents a permanent magnet 40.
The syringe receiver 90 presents a first area, which is configured as a hollow cylinder, so that the syringe body 25 can be received in it. Furthermore, the syringe receiver 90 presents a second area, which is also configured in the form of a hollow cylinder. In this second area of the syringe receiver 90, the second area of the carriage 45 has been received in a movable way. In this second area of the syringe area 90, the first reed contact 50 and the second reed contact 60 are positioned.
When the syringe die 20 is moved, the carriage 45 moves with it. The switch area of the carriage 45 moves in the second area of the syringe receiver. When the syringe die 20 has been pushed completely into the syringe body 25, the permanent magnet faces the reed contact 60, so that the latter can then be connected. When the syringe die 20 is pulled out of the syringe body, the permanent magnet 40 faces, in a position of the syringe die 20, the reed contact 50, so that the latter is connected.
The syringe receiver 90 and the carriage 45 can be used multiple times. They form a component group that belongs together and into which a commercial syringe 30 can be integrated. For this purpose, the syringe body 25 is inserted in the first area of the syringe receiver 90, and the handle 21 of the syringe die 20 is connected to the connection area of the carriage 45 by a snap connection. In this way, a sterile syringe can be provided in a simple and cost effective way, and positions of the piston section 22 can be detected.
Figure 5 shows a diagram of an additional embodiment example of a position detection device 10. In this embodiment example, the carriage 45 is provided with a reed contact 40 and with a carriage-side abutment 100. A rail 120 which is provided in a positionally fixed way relative to the syringe body 25 is provided with a slot - not shown - and presents a first magnet 60. A positioning device 110 is mounted on the rail 120. This positioning device 110 comprises a second magnet 50, an abutment 104 with a threaded hole which is not shown, and a screw 115 which is not shown and which is led through the slot, and tightened in such a way in the threaded hole that the positioning device 110 is secured on the rai1120.
When the syringe is drawn up, the quantity that can be drawn up is limited by the abutment 104. In addition, the reed contact 40, because it is brought in the vicinity of the magnet 50, generates a position signal when the syringe is in the drawn up state.
Moreover, it is possible to detect the point in time when the emptying of the syringe starts.
When the content of the syringe has been emptied, the reed contact 40 is in the vicinity of the magnet 60. As a result, a position signal is also generated.
By loosening the screw 115, the positioning device 110 can be moved along the rail 120. By tightening the screw 115, the positioning device 110 can be fixed in any place in the area of the carriage. As a result, it is possible to change the maximum quantity that can be drawn up into the syringe.
The syringe receiver 90 and the carriage 45 can be used multiple times. They form a component group that belongs together and into which a commercial syringe 30 can be integrated. For this purpose, the syringe body 25 is inserted in the first area of the syringe receiver 90, and the handle 21 of the syringe die 20 is connected to the connection area of the carriage 45 by a snap connection. In this way, a sterile syringe can be provided in a simple and cost effective way, and positions of the piston section 22 can be detected.
Figure 5 shows a diagram of an additional embodiment example of a position detection device 10. In this embodiment example, the carriage 45 is provided with a reed contact 40 and with a carriage-side abutment 100. A rail 120 which is provided in a positionally fixed way relative to the syringe body 25 is provided with a slot - not shown - and presents a first magnet 60. A positioning device 110 is mounted on the rail 120. This positioning device 110 comprises a second magnet 50, an abutment 104 with a threaded hole which is not shown, and a screw 115 which is not shown and which is led through the slot, and tightened in such a way in the threaded hole that the positioning device 110 is secured on the rai1120.
When the syringe is drawn up, the quantity that can be drawn up is limited by the abutment 104. In addition, the reed contact 40, because it is brought in the vicinity of the magnet 50, generates a position signal when the syringe is in the drawn up state.
Moreover, it is possible to detect the point in time when the emptying of the syringe starts.
When the content of the syringe has been emptied, the reed contact 40 is in the vicinity of the magnet 60. As a result, a position signal is also generated.
By loosening the screw 115, the positioning device 110 can be moved along the rail 120. By tightening the screw 115, the positioning device 110 can be fixed in any place in the area of the carriage. As a result, it is possible to change the maximum quantity that can be drawn up into the syringe.
List of reference numerals Position detection device Syringe die 21 Handle 5 22 Piston section Syringe body Syringe Nozzle Switching device 10 45 Carriage Switching device Switching device Processing apparatus Tube 15 81 First tube area 82 First valve 83 Second tube area 84 Second valve Syringe receiver 20 100 Carriage-side abutment 104 Abutment 110 Positioning device 115 Screw 120 Rail
Claims (20)
1. Position detection device (10) for detecting at least a first and a second position of a syringe die (20) relative to the syringe body (25) of a syringe (30), comprising at least three switching devices (40, 50, 60), where at least one switching device (40, 50, 60) is configured as a reed contact and at least one switching device (40, 50, 60) is configured as a magnet.
2. Position detection device (10) according to Claim 1, where two of the switching devices (40, 50, 60) are arranged in a positionally fixed way relative to the syringe body (25).
3. Position detection device (10) according to Claim 1, where two of the switching devices (40, 50, 60) are arranged so they are movable relative to the syringe body (25).
4. Position detection device (10) according to one of the previous claims, where the second position of the syringe die (20) is the position in which the syringe die (20) is located immediately after emptying the syringe.
5. Position detection device (10) according to one of the previous claims, where a first positionally fixed switching device (50) can be fixed in a first area which corresponds to a first position of the syringe die (20).
6. Position detection device (10) according to one of the previous claims, where the separation between at least one movable switching device (40) and at least one positionally fixed switching device (50, 60) is adjustable.
7. Position detection device (10) according to one of the previous claims, where at least one movable switching device (40) or at least one positionally fixed switching device (60) comprises magnetizable plastic.
8. Position detection device (10) according to one of the previous claims, comprising a latch which is arranged so it delimits a draw up piston stroke of the syringe die (20).
9. Position detection device (10) according to Claim 8, where the latch can be connected to a positionally fixed switching device (50).
10. Position detection device (10) according to Claim 8 or 9, where the latch presents a bevel, which is arranged so it transmits a force into the syringe die (20), which force does not act in an actuation direction of the syringe die (20), when the position sensor is not connected to the syringe die (20), and a pressure is exerted on the syringe die (20).
11. Position detection device (10) according to one of the previous claims, where the position detection device can be connected to a syringe (30).
12. Position detection device (10) according to one of the previous claims, where the position detection device (10) presents a carriage (45) which is connected to at least one switching device (40, 50, 60), and which can be connected to the syringe die (20).
13. Position detection device (10) according to one of the previous claims, where the position detection device (10) presents a syringe receiver (90), which is arranged so as to receive the syringe body (25).
14. Method for detecting at least two positions of a syringe die (20) relative to the syringe body (25) of a syringe (30), comprising the following steps:
drawing up into the syringe (30), detection of the first position of the syringe die (20), detection of the point in time when the syringe die (20) leaves the first position, pressing of the content of the syringe (30) through a nozzle of the syringe (30), detection of a second position of the syringe die (20) and of the point in time when the syringe die (20) has reached the second position, and processing of the first position and second position, and of the points in time when the first and second positions of the syringe die (20) are detected, in a processing apparatus (70).
drawing up into the syringe (30), detection of the first position of the syringe die (20), detection of the point in time when the syringe die (20) leaves the first position, pressing of the content of the syringe (30) through a nozzle of the syringe (30), detection of a second position of the syringe die (20) and of the point in time when the syringe die (20) has reached the second position, and processing of the first position and second position, and of the points in time when the first and second positions of the syringe die (20) are detected, in a processing apparatus (70).
15. Method according to Claim 14, comprising furthermore the process steps:
connection of the position detection device (10) to the syringe (30), setting of the first positionally fixed switching device (50).
connection of the position detection device (10) to the syringe (30), setting of the first positionally fixed switching device (50).
16. . Method according to Claim 14 or 15, comprising furthermore the process step:
setting of the second positionally fixed switching device (60).
setting of the second positionally fixed switching device (60).
17. Method according to one of Claims 14-16, comprising furthermore the process step:
stopping of the drawing up into the syringe (30).
stopping of the drawing up into the syringe (30).
18. Method according to one of Claims 14-17, comprising furthermore the process step:
emission of a signal, when the duration between the time when a first position of the syringe die (20) has been reached, and the time when a second position of the syringe die (20) has been reached, is too short or too long and/or when the latch that has been arranged to delimit a draw up piston stroke of the syringe die (20) has not been activated.
emission of a signal, when the duration between the time when a first position of the syringe die (20) has been reached, and the time when a second position of the syringe die (20) has been reached, is too short or too long and/or when the latch that has been arranged to delimit a draw up piston stroke of the syringe die (20) has not been activated.
19. Method according to one of Claims 14-18, comprising furthermore the process step:
delivery of the region in which the second positionally fixed switching device (60) is positioned, to a processing apparatus (70).
delivery of the region in which the second positionally fixed switching device (60) is positioned, to a processing apparatus (70).
20. Method according to one of Claims 14-19, comprising furthermore the process step:
calculation of the volume that has been injected between the time when the first position is left, and the time when the second position is reached.
calculation of the volume that has been injected between the time when the first position is left, and the time when the second position is reached.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200710045189 DE102007045189A1 (en) | 2007-09-21 | 2007-09-21 | Position detecting device and method for detecting at least two positions |
| DE102007045189.1 | 2007-09-21 | ||
| PCT/EP2008/007728 WO2009040026A2 (en) | 2007-09-21 | 2008-09-16 | Position detection device and method for detecting at least two positions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2700289A1 true CA2700289A1 (en) | 2009-04-02 |
Family
ID=40379657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2700289A Abandoned CA2700289A1 (en) | 2007-09-21 | 2008-09-16 | Position detection device and method for detecting at least two positions |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2200513A2 (en) |
| CN (1) | CN101868179A (en) |
| CA (1) | CA2700289A1 (en) |
| DE (2) | DE102007045189A1 (en) |
| WO (1) | WO2009040026A2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2327431A1 (en) * | 2009-11-25 | 2011-06-01 | Letcat Aktiebolag | Medical delivery device |
| CN102646353A (en) * | 2012-04-28 | 2012-08-22 | 徐州医学院 | Anesthesia operation simulation device |
| CN105307708B (en) * | 2012-12-07 | 2018-01-02 | 史密斯医疗Asd公司 | The sign of syringe |
| CN109099945B (en) * | 2013-01-29 | 2021-11-02 | 赛诺菲-安万特德国有限公司 | Combination body for detecting position of plunger |
| CN105402174B (en) * | 2015-12-08 | 2018-04-03 | 成都飞机设计研究所 | The double remaining detection means and detection determination methods of a kind of hydraulic oil container oil mass |
| CN111655311B (en) * | 2017-12-01 | 2022-09-30 | 赛诺菲 | Sensor system |
| BR112021003622A2 (en) * | 2018-08-30 | 2021-05-18 | Hewlett-Packard Development Company, L.P. | syringe bodies |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4435173A (en) * | 1982-03-05 | 1984-03-06 | Delta Medical Industries | Variable rate syringe pump for insulin delivery |
| US5254096A (en) * | 1992-09-23 | 1993-10-19 | Becton, Dickinson And Company | Syringe pump with graphical display or error conditions |
| US6645177B1 (en) * | 1999-02-09 | 2003-11-11 | Alaris Medical Systems, Inc. | Directly engaged syringe driver system |
| DE1034737T1 (en) * | 1999-03-06 | 2001-03-15 | Pulsion Medical Sys Ag | Injection channel for a blood vessel catheter |
| DE10330984B4 (en) * | 2003-07-09 | 2009-12-10 | Tecpharma Licensing Ag | Injection device with position sensor |
-
2007
- 2007-09-21 DE DE200710045189 patent/DE102007045189A1/en not_active Ceased
- 2007-09-21 DE DE202007018843U patent/DE202007018843U1/en not_active Expired - Lifetime
-
2008
- 2008-09-16 CA CA2700289A patent/CA2700289A1/en not_active Abandoned
- 2008-09-16 CN CN200880116114A patent/CN101868179A/en active Pending
- 2008-09-16 WO PCT/EP2008/007728 patent/WO2009040026A2/en active Application Filing
- 2008-09-16 EP EP08802257A patent/EP2200513A2/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE202007018843U1 (en) | 2009-10-01 |
| CN101868179A (en) | 2010-10-20 |
| DE102007045189A1 (en) | 2009-04-09 |
| WO2009040026A3 (en) | 2009-09-17 |
| EP2200513A2 (en) | 2010-06-30 |
| WO2009040026A2 (en) | 2009-04-02 |
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| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20110916 |