CN110353991B - Precise filtering device for injection and filtering method thereof - Google Patents
Precise filtering device for injection and filtering method thereof Download PDFInfo
- Publication number
- CN110353991B CN110353991B CN201910677620.1A CN201910677620A CN110353991B CN 110353991 B CN110353991 B CN 110353991B CN 201910677620 A CN201910677620 A CN 201910677620A CN 110353991 B CN110353991 B CN 110353991B
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- 238000001914 filtration Methods 0.000 title claims abstract description 58
- 238000002347 injection Methods 0.000 title claims abstract description 52
- 239000007924 injection Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 10
- 239000007788 liquid Substances 0.000 claims abstract description 60
- 239000003814 drug Substances 0.000 claims abstract description 37
- 239000012528 membrane Substances 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 4
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 230000000474 nursing effect Effects 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 5
- 239000002245 particle Substances 0.000 description 14
- 239000011521 glass Substances 0.000 description 5
- 238000001802 infusion Methods 0.000 description 4
- 239000003708 ampul Substances 0.000 description 2
- 210000004204 blood vessel Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 208000015181 infectious disease Diseases 0.000 description 2
- 239000011859 microparticle Substances 0.000 description 2
- 208000001297 phlebitis Diseases 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010002198 Anaphylactic reaction Diseases 0.000 description 1
- 208000005189 Embolism Diseases 0.000 description 1
- 206010018691 Granuloma Diseases 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 229930182555 Penicillin Natural products 0.000 description 1
- JGSARLDLIJGVTE-MBNYWOFBSA-N Penicillin G Chemical compound N([C@H]1[C@H]2SC([C@@H](N2C1=O)C(O)=O)(C)C)C(=O)CC1=CC=CC=C1 JGSARLDLIJGVTE-MBNYWOFBSA-N 0.000 description 1
- 208000007536 Thrombosis Diseases 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000036783 anaphylactic response Effects 0.000 description 1
- 208000003455 anaphylaxis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000036770 blood supply Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000003743 erythrocyte Anatomy 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007954 hypoxia Effects 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 208000028867 ischemia Diseases 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 230000004199 lung function Effects 0.000 description 1
- 210000002540 macrophage Anatomy 0.000 description 1
- 230000017074 necrotic cell death Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 229940049954 penicillin Drugs 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 230000002685 pulmonary effect Effects 0.000 description 1
- 206010043554 thrombocytopenia Diseases 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/14—Details; Accessories therefor
- A61J1/20—Arrangements for transferring or mixing fluids, e.g. from vial to syringe
- A61J1/2003—Accessories used in combination with means for transfer or mixing of fluids, e.g. for activating fluid flow, separating fluids, filtering fluid or venting
- A61J1/2048—Connecting means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/14—Details; Accessories therefor
- A61J1/20—Arrangements for transferring or mixing fluids, e.g. from vial to syringe
- A61J1/2003—Accessories used in combination with means for transfer or mixing of fluids, e.g. for activating fluid flow, separating fluids, filtering fluid or venting
- A61J1/2079—Filtering means
- A61J1/2086—Filtering means for fluid filtration
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/14—Details; Accessories therefor
- A61J1/20—Arrangements for transferring or mixing fluids, e.g. from vial to syringe
- A61J1/2096—Combination of a vial and a syringe for transferring or mixing their contents
Landscapes
- Health & Medical Sciences (AREA)
- Pharmacology & Pharmacy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The precise filtering device for injection comprises a filter, wherein the filter comprises a filter main body, a valve core, a filter upper cover and a knob for rotating the valve core, a core groove which is convenient for the valve core to be installed and rotated is formed in the filter main body, at least three interfaces matched with an injector or an injection needle are arranged in the circumferential direction of the core groove, and a filtering membrane for filtering liquid medicine is arranged on at least one interface; the valve core is internally provided with a liquid channel, and the liquid channel is provided with a plurality of circulation ports for communicating any two ports at a time. The device reasonable in design, convenient to use is safer to nursing staff and patient, and the particulate pollution in the liquid medicine is stopped as far as possible, prevents that it from causing harm to the patient, makes things convenient for nursing staff's operation simultaneously, reduces nursing staff's risk of infecting.
Description
Technical Field
The invention relates to a filtering device, in particular to a precise filtering device for injection and a filtering method of the precise filtering device for injection.
Background
At present, the injection of liquid medicine by an injector directly or indirectly through an infusion apparatus is a common treatment method in hospitals, but glass (such as rubber) particles with the size of 10-250 ㎛ are generated when ampoule bottles and penicillin bottles are unsealed, the liquid medicine is easily sucked into the injector through an injection needle tube without filtering and then is injected into a human body, and side effects such as phlebitis and the like are caused to be caused-! The liquid medicine is injected into the infusion set by the injector and then is infused into the vein of the human body by the infusion set, so that the particles enter the human body to cause more harm.
The harm of infusion particle pollution to the body comprises:
1. Directly blocking blood vessels to cause partial blood supply deficiency, ischemia, hypoxia and even necrosis of tissues;
2. the red blood cells aggregate on the microparticles to form thrombus, causing vascular embolism and phlebitis;
3. The particles enter the pulmonary capillaries to cause the proliferation of macrophages, and surround the particles to form granuloma in the lung, thereby affecting the lung function;
4. causing thrombocytopenia and anaphylaxis;
5. the microparticles stimulate the tissue to produce inflammation or form tumors.
When the needle is sucked into the ampoule bottle for injection, the glass particles are possibly mixed, various side effects can be caused by foreign matters such as the glass particles directly injected into the body, the particles can move around the body after being injected into the blood vessel, if the glass particles entering the body are not timely discharged outside the body, the damage to organs in the body is easily caused, and if the glass particles are injected into the vertebra, the damage is more fatal.
Thus, in view of the above problems, a large variety of filter-type syringe products have appeared on the market, but all have various drawbacks, the prior art has the following drawbacks:
1. some filter type injectors simply add a filter device at the needle site or add a one-way valve to separate the fluid inlet from the fluid outlet. The design can not completely stop particles, because the outer wall and the inner wall of the needle are very likely to be polluted by the particles when the injection needle sucks the liquid medicine, some particles can be attached to the needle, and when the same needle is used for injection, the particles can be injected into a human body;
2. The filtering type injector for solving the problems adopts two needles, one needle is additionally arranged outside the existing needle, the filtering membrane is arranged at the top end or the lower end of the needle, when the liquid medicine is sucked, the liquid medicine is filtered, the outer needle is pulled out after the liquid medicine is sucked, and then the inner needle is used for injection; on the other hand, when the outer needle is pulled out, the hand is highly likely to contact the inner needle, so that the inner needle is polluted.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the precise filtering device head for injection, which is safer for nursing staff and patients, prevents the pollution of particles in liquid medicine from being harmful to the patients as far as possible, is convenient for the operation of the nursing staff and reduces the risk of infection of the nursing staff.
Another technical problem to be solved by the invention is to provide a filtering method of the precise filtering device for injection.
The technical problems to be solved by the invention are realized by the following technical proposal. The invention relates to a precise filtering device for injection, which comprises a filter, wherein the filter comprises a filter main body, a valve core, a filter upper cover and a knob for rotating the valve core, a core groove which is convenient for the installation and rotation of the valve core is formed in the filter main body, at least three interfaces matched with an injector or an injection needle are arranged in the circumferential direction of the core groove, and a filtering membrane for filtering liquid medicine is arranged on at least one interface; the valve core is internally provided with a liquid channel, and the liquid channel is provided with a plurality of circulation ports for communicating any two ports at a time.
The technical problem to be solved by the invention can be further solved by the following technical scheme, for the precise filtering device for injection, 3 interfaces and 3 circulating ports are arranged, the 3 interfaces are respectively arranged at the top, the bottom and the left side of the core groove, and the filtering membrane is arranged on the left side interface; the 3 interfaces are respectively arranged at the top, the bottom and the right side of the valve core.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and the liquid channel is T-shaped for the precise filtering device for injection.
The technical problem to be solved by the invention can be further solved by the following technical scheme, for the precise filtering device for injection, the valve core is fixedly connected with a rotary rod, the knob is provided with a rotary groove matched with the rotary rod, and the other end of the rotary rod penetrates through the upper cover of the filter and is clamped in the rotary groove.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and for the precise filtering device for injection, the rotating rod and the rotating groove are both in a regular hexagon shape or a rectangle shape.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and for the precise filtering device for injection, an inner ring table matched with the filtering membrane is arranged in an interface for installing the filtering membrane.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and for the precise filtering device for injection, the upper cover of the filter is arranged on the main body of the filter in a fastening or ultrasonic welding or bonding connection mode.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and for the precise filtering device for injection, a sealing ring for enhancing the sealing performance is further arranged between the upper cover of the filter and the filter body.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and the filtering method of the precise filtering device for injection comprises the following steps of:
(1) The interface provided with the filtering membrane is provided with a dispensing needle, and other interfaces are respectively provided with an injection needle and an injector;
(2) The valve core is rotated through the knob, the interface provided with the dispensing needle is communicated with the interface provided with the injector, then the dispensing needle is inserted into the dispensing bottle to absorb the liquid medicine, the liquid medicine flows out of the dispensing bottle and sequentially flows through the filtering membrane and the liquid channel on the valve core to enter the injector;
(3) After the liquid medicine is sucked, the valve core is rotated through the knob, the interface provided with the injection needle is communicated with the interface provided with the injector, then the injection needle is utilized for injection, the liquid medicine flows out from the injector, and the liquid medicine flows through the liquid channel on the valve core and the injection needle in sequence and is then output outwards.
Compared with the prior art, the invention has the beneficial effects that:
1. The filter main body is provided with a plurality of interfaces connected with the injection needle (or the dispensing needle or the flushing needle), and after the medicine liquid is inhaled, the injection can be carried out by changing one interface by rotating a certain angle; the liquid medicine is filtered by the filter membrane when the liquid medicine is sucked, so that particulate pollution is radically eliminated;
2. The interface on the filter main body is connected with a plurality of injection needles (or dispensing needles or flushing needles), after the medicine liquid is sucked, nursing staff only need to rotate a certain angle, the original operation habit is not changed, and the injection is simple and convenient, and the risk of infection of the nursing staff is reduced.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention;
Fig. 2 is a top view of a structure of the present invention.
FIG. 3 is a side view of one construction of the present invention;
Fig. 4 is a schematic view of an internal structure of the present invention.
FIG. 5 is a flow chart of the liquid medicine when the liquid medicine is absorbed in the invention;
Fig. 6 is an external view of the present invention when absorbing liquid.
FIG. 7 is a flow chart of the liquid medicine at the time of injection according to the present invention;
Fig. 8 is an external view of the injection of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 8, a precise filtering device for injection comprises a filter, wherein the filter comprises a filter main body 12, a valve core 6, a filter upper cover 3 and a knob 2 for rotating the valve core 6, a core groove which is convenient for installing and rotating the valve core 6 is formed in the filter main body 12, at least three interfaces matched with a syringe or an injection needle are arranged in the circumferential direction of the core groove, and a filtering membrane 10 for filtering liquid medicine is arranged on at least one interface; the inside of case 6 is provided with liquid passageway 5, is provided with a plurality of circulation mouthfuls that are used for once to communicate arbitrary two interfaces among them on the liquid passageway 5. The filter main body 12, the core groove and the valve core 6 are all cylindrical, the valve core 6 is movably arranged in the core groove and can rotate 360 degrees in the core groove, the outer edge of the valve core 6 is tightly attached to the inner groove edge of the core groove, and a gap which can facilitate the rotation of the core groove is reserved, so that the valve core 6 cannot rotate by itself after rotating in place; the notch of the core groove is sealed by the upper filter cover 3; the knob 2 is connected with the knob 2 through a rotary rod 4 fixed on the core groove, so that the core groove can be conveniently rotated through the knob 2, meanwhile, an opening matched with the rotary rod 4 is formed in the upper filter cover 3, the opening is sealed through rotary sealing, the rotary sealing belongs to one type of dynamic sealing, and the rotary sealing consists of a slip ring made of filled polytetrafluoroethylene and a rubber O-shaped ring for providing elasticity; the forwarding valve core 6 is rotated once, namely, the valve core 6 can only be communicated with two interfaces through the liquid channel 5 each time, so that different interfaces can be conveniently switched, and the operation of dispensing or transfusion is carried out.
The number of the interfaces and the number of the circulating ports are 3, the 3 interfaces are respectively arranged at the top, the bottom and the left side of the core groove, and the filtering membrane 10 is arranged on the left interface; the 3 interfaces are respectively arranged at the top, the bottom and the right side of the valve core 6. The interface on the left side of the core groove can be arranged on the right side, but the circulation port on the right side of the valve core 6 is also arranged on the left side, namely, the arrangement directions of the two ports are opposite, so that the switching can be facilitated; in a normal case, 3 interfaces are provided, namely an injector interface 11, an injection needle interface 7 and a dispensing needle interface 8, and a filtering membrane 10 is arranged at the dispensing needle interface 8 and is used for filtering the input liquid medicine; the liquid channel 5 is also provided with 3 mutually communicated circulation ports for being matched with the 3 ports respectively, and at the same time, two of the 3 ports can only be conducted by using the 3 circulation ports, and the valve core 6 is rotated to switch, so that the medicine dispensing and the transfusion are facilitated.
The liquid channel 5 is in a T shape, the liquid channel 5 comprises a vertical channel and a transverse channel vertically communicated with the middle of the vertical channel, a T-shaped channel is formed, and two end parts of the vertical channel and one end part of the transverse channel are circulation ports.
The rotary rod 4 is fixedly connected to the valve core 6, the rotary knob 2 is provided with a rotary groove 1 matched with the rotary rod 4, the other end of the rotary rod 4 penetrates through the upper filter cover 3 and is clamped in the rotary groove 1, the rotary rod 4 is conveniently rotated through the rotary knob 2, and the valve core 6 is further rotated; the knob 2 is designed to be in an arrow shape and is used for indicating the direction of liquid flow, so that the operation of operators is facilitated; of course, the knob 2 can be designed into other shapes, and only the raised arrow mark is added on the knob 2, so that the function of indicating the direction of liquid flow can be achieved.
The rotary rod 4 and the rotary groove 1 are both in a regular hexagon shape or a rectangle shape, and can be designed into other shapes and how to form a quincuncial pile for resisting the rotary force.
An inner ring table 9 matched with the filtering membrane 10 is arranged in the interface for installing the filtering membrane 10, and forms a step shape with the end part of the interface, so that the filtering membrane 10 is conveniently and fixedly supported from the inside.
The filter upper cover 3 is mounted on the filter body 12 by means of a snap-fit or ultrasonic welding or adhesive connection. The filter upper cover 3 and the filter main body 12 can be connected by a buckle type, or can be bonded by ultrasonic welding or glue.
A sealing ring for enhancing the sealing performance is further arranged between the filter upper cover 3 and the filter body, so that the liquid in the filter upper cover does not flow out.
A filtering method of a precise filtering device for injection comprises the following steps:
(1) The interface provided with the filtering membrane is provided with a dispensing needle, and other interfaces are respectively provided with an injection needle and an injector;
(2) The valve core is rotated through the knob, the interface provided with the dispensing needle is communicated with the interface provided with the injector, then the dispensing needle is inserted into the dispensing bottle to absorb the liquid medicine, the liquid medicine flows out of the dispensing bottle and sequentially flows through the filtering membrane and the liquid channel on the valve core to enter the injector;
(3) After the liquid medicine is sucked, the valve core is rotated through the knob, the interface provided with the injection needle is communicated with the interface provided with the injector, then the injection needle is utilized for injection, the liquid medicine flows out from the injector, and the liquid medicine flows through the liquid channel on the valve core and the injection needle in sequence and is then output outwards.
Claims (1)
1. A filtering method of a precise filtering device for injection is characterized in that: the method uses a precise filtering device for injection, the filtering device comprises a filter, the filter comprises a filter main body, a valve core, a filter upper cover and a knob for rotating the valve core, a core groove which is convenient for the valve core to be installed and rotated is arranged on the filter main body, at least three interfaces matched with an injector or an injection needle are arranged on the circumference of the core groove, and a filtering membrane for filtering liquid medicine is arranged on at least one interface; the valve core is internally provided with a liquid channel, and the liquid channel is provided with a plurality of circulation ports for communicating any two ports at a time;
the number of the interfaces and the number of the circulation ports are 3, the 3 interfaces are respectively arranged at the top, the bottom and the left side of the core groove, and the left side interface is provided with a filtering membrane; the 3 interfaces are respectively arranged at the top, the bottom and the right side of the valve core;
The liquid channel is in a T shape;
The rotary rod is fixedly connected to the valve core, a rotary groove matched with the rotary rod is formed in the rotary knob, and the other end of the rotary rod penetrates through the upper cover of the filter and is clamped in the rotary groove;
The rotary rod and the rotary groove are both in a regular hexagon shape or a rectangular shape;
an inner ring table matched with the filtering membrane is arranged in the interface for installing the filtering membrane;
the filter upper cover is arranged on the filter main body in a fastening or ultrasonic welding or bonding connection mode;
a sealing ring for enhancing the sealing performance is also arranged between the filter upper cover and the filter body;
The method comprises the following steps:
(1) The interface provided with the filtering membrane is provided with a dispensing needle, and other interfaces are respectively provided with an injection needle and an injector;
(2) The valve core is rotated through the knob, the interface provided with the dispensing needle is communicated with the interface provided with the injector, then the dispensing needle is inserted into the dispensing bottle to absorb the liquid medicine, the liquid medicine flows out of the dispensing bottle and sequentially flows through the filtering membrane and the liquid channel on the valve core to enter the injector;
(3) After the liquid medicine is sucked, the valve core is rotated through the knob, the interface provided with the injection needle is communicated with the interface provided with the injector, then the injection needle is utilized for injection, the liquid medicine flows out from the injector, and the liquid medicine flows through the liquid channel on the valve core and the injection needle in sequence and is then output outwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910677620.1A CN110353991B (en) | 2019-07-25 | 2019-07-25 | Precise filtering device for injection and filtering method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910677620.1A CN110353991B (en) | 2019-07-25 | 2019-07-25 | Precise filtering device for injection and filtering method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110353991A CN110353991A (en) | 2019-10-22 |
| CN110353991B true CN110353991B (en) | 2024-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910677620.1A Active CN110353991B (en) | 2019-07-25 | 2019-07-25 | Precise filtering device for injection and filtering method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110353991B (en) |
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2019
- 2019-07-25 CN CN201910677620.1A patent/CN110353991B/en active Active
Patent Citations (9)
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|---|---|---|---|---|
| WO2015125987A1 (en) * | 2014-02-21 | 2015-08-27 | 엘케이메디칼(주) | Syringe integrated with filter needle, blood backflow prevention device and venous catheter having blood backflow prevention device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110353991A (en) | 2019-10-22 |
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