CN115607266A

CN115607266A - Anti-drop medical catheter

Info

Publication number: CN115607266A
Application number: CN202211295415.7A
Authority: CN
Inventors: 于琼; 董超; 高宾; 蔡燕丽; 林颖
Original assignee: Shanghai Hongdian Medical Technology Co ltd
Current assignee: Shanghai Hongdian Medical Technology Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-01-17

Abstract

The present invention provides an anti-drop medical catheter, including: the catheter comprises a catheter body, a first electrode, a second electrode and a safety wire; one end of the second electrode is connected to the far end of the catheter body, and the other end of the second electrode is in insulated connection with the first electrode; the safety wire is arranged along the axial extension of the catheter body, one end of the safety wire is fixed on the first electrode, and the other end of the safety wire is fixed at the near end of the catheter body. According to the anti-falling medical catheter, the first electrode and the catheter body are stably connected into a whole through the safety wire, so that the risk of disconnection between the first electrode and the second electrode is greatly reduced.

Description

Anti-drop medical catheter

Technical Field

The invention relates to the technical field of medical treatment, in particular to an anti-falling medical catheter.

Background

Hypertension is one of the major risk factors for cardiovascular disease. Statistically, over 900 million people die of hypertension complications, such as myocardial infarction, stroke, and renal failure, every year; over 10 million people worldwide currently suffer from hypertension, which is expected to increase to 15 million by 2025, of which 10% -15% are refractory hypertension. Although various safe and effective antihypertensive drugs exist, for intractable hypertension, the antihypertensive drugs are difficult to control the blood pressure within a normal range.

Renal artery denervation (RDN) is a new interventional technique that has been introduced in the last decade to treat refractory hypertension by blocking the renal artery sympathetic afferent and efferent nerve fibers. In clinical experiments of intractable hypertension, the RDN shows good application prospect.

Currently, renal nerve ablation is usually performed in a "blind" manner, i.e., ablation is performed on the entire renal artery. An ideal renal artery ablation procedure should selectively block the renal sympathetic nerves without damaging the sympathetic innervation of other organs. Therefore, an ablation catheter capable of accurately marking the distribution of renal nerves on renal arteries and simultaneously realizing accurate ablation of abnormal renal nerve sites is urgently needed clinically. Stimulation of renal sympathetic nerves can cause elevated blood pressure and altered heart rate and muscle sympathetic excitability. Blood pressure and heart rate can be raised by increasing sympathetic tone by directly stimulating renal nerves, and renal nerve ablation at this site can be expected to destroy renal nerve fibers more accurately, thereby improving clinical efficacy, minimizing unnecessary ablation in operation, and ensuring safety.

The ideal renal nerve removing catheter system ensures that not only can the renal nerve be stimulated by supplying current to map the renal nerve distribution, but also the energy can be conducted to carry out renal nerve removing operation on abnormal renal nerve sites, and also ensures the safety of all aspects in the operation. However, the existing renal denervation catheter systems use a bipolar ablation catheter for stimulation to find a target site, and when the target site is ablated, there is a risk of detachment or disconnection between the two electrodes.

Disclosure of Invention

The invention aims to provide an anti-falling medical catheter and a medical system, and aims to solve the problem that the risk of falling off or disconnection exists between two electrodes of the conventional bipolar anti-falling medical catheter.

In order to solve the above problems, the present invention provides an anti-drop medical catheter, comprising: the catheter comprises a catheter body, a first electrode, a second electrode and a safety wire;

one end of the second electrode is connected to the far end of the catheter body, and the other end of the second electrode is in insulated connection with the first electrode;

the safety wire is arranged along the axial extension of the catheter body, one end of the safety wire is fixed on the first electrode, and the other end of the safety wire is fixed at the near end of the catheter body.

Optionally, in the anti-drop medical catheter, the proximal surface of the first electrode has a first groove extending in the length direction, the safety wire is wound around the proximal end of the first electrode and extends to the proximal end of the catheter body along the first groove, and the safety wire is bonded and fixed to the first electrode.

Optionally, in the anti-drop medical catheter, the proximal end of the catheter body includes a glue injection section, and the proximal end of the safety wire is fixed in the glue injection section.

Optionally, in the anti-falling medical catheter, the catheter body includes a saline tube extending in an axial direction and a saline braided tube connected to a proximal end of the saline tube, the saline tube and the saline braided tube are connected by glue injection, and a connection portion forms the glue injection section.

Optionally, in the anti-drop medical catheter, the catheter body further includes a handle, a socket and a protection tube connected to a distal end of the socket are disposed in the handle, glue is filled in the protection tube, and the proximal end of the safety wire is fixed in the protection tube.

Optionally, in the anti-drop medical catheter, the safety wire is made of an insulating flexible material.

Optionally, in the anti-falling medical catheter, the inner core of the safety wire is made of a conductive rigid material.

Optionally, in the anti-drop medical catheter, the anti-drop medical catheter further includes a sensing unit, the sensing unit includes a sensing portion and a conducting portion, the sensing portion is sandwiched between the first electrode and the second electrode, and a sensing signal of the sensing portion is transmitted to an external device through the conducting portion, so as to be used for determining a change in a relative position of the first electrode and the second electrode.

Optionally, in the anti-detachment medical catheter, the sensing portion includes a biosensor; or, the sensing part is made of metal materials, and the sensing part is connected with the first electrode and the second electrode in an insulating mode.

Optionally, in the anti-shedding medical catheter, the sensing portion includes a pressure sensor, the first electrode and the second electrode are connected through an insulating gasket, a second groove is formed on a surface of the insulating gasket, which is closer to the second electrode than the first electrode, and the pressure sensor is disposed in the second groove.

Optionally, in the anti-drop medical catheter, the first electrode has a first placement hole, the second electrode has a second placement hole, the first placement hole is used for installing a first temperature sensor, and a lead of the first temperature sensor passes through the second placement hole and extends to the proximal end of the catheter body.

In summary, the anti-drop medical catheter provided by the invention comprises: the catheter comprises a catheter body, a first electrode, a second electrode and a safety wire; one end of the second electrode is connected to the far end of the catheter body, and the other end of the second electrode is in insulated connection with the first electrode; the safety wire is arranged along the axial extension of the catheter body, one end of the safety wire is fixed on the first electrode, and the other end of the safety wire is fixed at the near end of the catheter body. According to the anti-falling medical catheter, the first electrode and the catheter body are stably connected into a whole through the safety wire, so that the risk of disconnection between the first electrode and the second electrode is greatly reduced.

Drawings

Fig. 1 is a partial structural schematic view of an anti-drop medical catheter according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a connection manner of the first electrode and the safety wire according to an embodiment of the present invention;

FIG. 3 is an exploded view of a first electrode and a second electrode in an embodiment of the invention;

FIG. 4 is a schematic view of an anti-detachment medical catheter entering a renal artery for ablation according to an embodiment of the present invention;

FIG. 5 is a schematic view of the securing of the distal end of the safety line in an embodiment of the invention;

FIG. 6 is a schematic view of another connection mode of the first electrode and the safety wire according to the embodiment of the present invention;

FIG. 7 is a schematic view of another securing arrangement for the distal end of the safety line in accordance with an embodiment of the present invention;

FIG. 8 is a perspective view of a first electrode and a second electrode in accordance with an embodiment of the present invention;

FIG. 9 is a schematic view of a fifth embodiment of the present invention showing the arrangement of the pressure sensor;

wherein the reference numerals are as follows:

1-a catheter body; 2-a first electrode; 3-a second electrode; 4-a safety line; 5-pulling a wire; 6-first insulating pad; 7-a brine pipe; 8-saline braided tube; 9-a handle; 10-a pressure sensor;

11-a body section; 12-a bendable section; 13-single lumen tubing section;

21-a first electrode head; 22-a first core rod;

221-a distal segment;

31-a second electrode head; 32-a second core rod;

91-a socket; 92-a protective tube;

100-a first groove; 200-a first placement hole; 300-a second placement hole;

Detailed Description

To make the objects, advantages and features of the present invention more apparent, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings are intended to show different emphasis, sometimes in different proportions. As used herein, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or", the terms "a" and "an" are generally employed in a sense including "at least one", the terms "at least two" are generally employed in a sense including "two or more", and furthermore, the terms "first", "second", "third" and the like in the specification are used merely to distinguish various components, elements, steps and the like in the specification, and are not used to indicate a logical relationship or a sequential relationship between various components, elements, steps and the like, unless otherwise specified or indicated.

The terms "proximal" and "distal" are defined herein with respect to a delivery catheter having one end for insertion into the body and a steering end extending out of the body. The term "proximal" refers to a location of an element that is closer to the steering end of the delivery catheter outside of the body, and the term "distal" refers to a location of an element that is closer to the end of the delivery catheter that is inserted into the body and, thus, further from the steering end of the delivery catheter. Alternatively, in a manual or hand-operated application scenario, the terms "proximal" and "distal" are defined herein with respect to an operator, such as a surgeon or clinician. The term "proximal" refers to a position of an element closer to the operator, and the term "distal" refers to a position of an element closer to the delivery catheter and thus further from the operator.

[ EXAMPLES ] A method for producing a semiconductor device

Referring to fig. 1 in combination with fig. 2 and 3, the present embodiment provides an anti-drop medical catheter, which includes a catheter body 1, a first electrode 2, a second electrode 3 and a safety wire 4. One end of the second electrode 3 is connected to the far end of the catheter body 1, and the other end of the second electrode 3 is connected with the first electrode 2 in an insulating way; the safety wire 4 extends along the axial direction of the catheter body 1, one end of the safety wire is fixed on the first electrode 2, and the other end of the safety wire is fixed on the near end of the catheter body 1.

As previously mentioned, there is a risk of detachment or disconnection between the two electrodes when stimulating with a bipolar ablation catheter to find a target site and ablating the target site. According to the anti-falling medical catheter provided by the embodiment, the first electrode 2 and the catheter body 1 are stably connected into a whole through the safety wire 4, so that the risk of disconnection between the first electrode 2 and the second electrode 3 is greatly reduced.

The anti-drop medical catheter provided by the embodiment is used for performing electrical stimulation or ablation through the first electrode 2 and the second electrode 3 after entering the renal artery through the femoral artery by puncturing the sheath. The first electrode 2 and the second electrode 3 can be made of platinum-iridium alloy or stainless steel, and the stimulation type comprises monopolar stimulation and bipolar stimulation, and the ablation type also comprises two forms of monopolar ablation and bipolar ablation.

Fig. 4 is a schematic view illustrating the anti-drop medical catheter provided in the embodiment entering a renal artery to perform an ablation procedure. The process is as follows: (1) Guiding the anti-drop medical catheter to enter a renal artery on one side, and monitoring blood pressure in a femoral artery on the other side to obtain a baseline measurement control value; (2) The anti-drop medical catheter is used for electrically stimulating renal nerves at a specific position in a renal artery lumen, observing physiological and pathological indexes such as blood pressure and the like after electrical stimulation, recording the change of the physiological and pathological indexes relative to a baseline measurement control value before stimulation to judge whether renal sympathetic nerve distribution exists at the position, and further carrying out selective targeted ablation. (3) Whether the blood pressure reduction effect is achieved can be judged by monitoring the blood pressure and the blood pressure gradient, and the stenosis degree of the renal artery is judged by FFR (fractional flow reserve) so as to avoid over ablation.

In the anti-drop medical catheter provided by the embodiment, the first electrode 2 and the second electrode 3 are in a porous form, and can be used for installing a lead, a temperature sensor, a positioning sensor and the like, in addition, a saline water perfusion function can be realized, renal artery injury, scabbing or clot formation can be prevented, and meanwhile, the lower contact surface temperature allows the use of higher power for ablation, the ablation depth is increased, and renal nerves are removed more safely and effectively.

In one embodiment, referring to fig. 2 and 3, the first electrode 2 includes a first electrode head 21 and a hollow first core rod 22, the first core rod 22 is connected to the proximal end of the first electrode head 21, the second electrode 3 includes a second electrode head 31 and a hollow second core rod 32, and the second core rod 32 is connected to the proximal end of the second electrode head 31; the first core rod 22 adopts a reducing design, the distal end section 221 has a larger diameter, the second electrode tip 31 is partially sleeved on the distal end section 221 and is insulated and spaced from the first electrode tip 21, and the second electrode tip 31 is insulated and connected with the distal end section 221. In addition, when the catheter is connected to the catheter body 1, the proximal end of the first core rod 22 extends into the catheter body 1, and the proximal end of the second core rod 32 is engaged with the distal end of the catheter body 1.

More specifically, the second electrode 3 and the first electrode 2 may be insulated by an insulating spacer, referring to fig. 1, the first electrode head 21 and the second electrode head 31 are separated by a first insulating spacer 6 shown in the figure, except for the first insulating spacer 6, the second electrode head 31 and the distal end section 221 of the first core rod 22 are separated by a second insulating spacer (not shown in the figure), the first insulating spacer 6 and the second insulating spacer are both hollow tubular structures, which can be separately arranged or integrally formed, and the outer diameter of the first insulating spacer 6 is larger than the outer diameter of the second insulating spacer, preferably, equal to the outer diameters of the first electrode head 21 and the second electrode head 31. The first insulating pad 6 and the second insulating pad can be connected to the first electrode 2 and the second electrode 3 by glue, and in other embodiments, the insulating connection between the first electrode 2 and the second electrode 3 can also be achieved by designing a glue layer with a suitable thickness. However, in consideration of the difficulty of the process operation, it is preferable to achieve the insulation between the first electrode 2 and the second electrode 3 by using the first insulating pad 6 and the second insulating pad.

Brine holes are formed in the first electrode tip 21 and the first core rod 22, brine is introduced from the inner cavity of the first core rod 22 and flows to the first electrode tip 21, the brine is sprayed to the outer periphery of the first electrode tip 21 through the brine holes in the first electrode tip 21, and simultaneously, the brine flows to the second electrode tip 31 through the brine holes in the first core rod 22 and is sprayed to the outer periphery of the second electrode tip 31 through the brine holes in the second electrode tip 31.

The distance between the first electrode tip 21 and the second electrode tip 31 (i.e., the axial width of the first insulating spacer 6) is 0.5 to 1.2mm, which can be adjusted according to the brine hole position of the second electrode 3 and/or the core rod length of the first electrode 2. Such an arrangement facilitates uniform distribution of the applied energy, achieving bipolar stimulation and bipolar ablation (although in other embodiments, different sized designs are possible, and the invention is not limited thereto). Under the premise that the process conditions allow and the insulation between the first electrode 2 and the second electrode 3 is ensured, the closer the distance between the first electrode head 21 and the second electrode head 31 is, the more concentrated the applied stimulation energy is, the better the stimulation effect is, and the smaller the range of the stimulated tissue is, which is helpful for finding a target point more accurately, so that the targeted ablation can be more accurately performed, the ablation area can be reduced, and the operation safety can be improved; in addition, the closer the distance, the more concentrated the energy of ablation, and the shorter the time required to reach the treatment temperature, helping to shorten the procedure time.

Referring to fig. 4, in the anti-drop medical catheter provided by the present embodiment, the catheter body 11 includes a main body section 11, a bendable section 12 and a single lumen tube section 13 connected in sequence from a proximal end to a distal end. The proximal end of the first electrode 2 extends into the single-lumen tube section 13, and the proximal end of the second electrode 3 is embedded in the single-lumen tube section 13.

The bendable section 12 is a multi-cavity pipe section and is respectively used for a saline pipe, a conducting wire, the safety wire 4 and a stay wire for controlling bending. The main body section 11 is a slender tube body containing knitting yarns, and the knitting yarns have the functions of supporting the tube body to prevent deformation, enabling the torque of the catheter to be transmitted in equal proportion and the like. The anti-drop medical catheter further comprises a handle 9, the handle 9 is arranged at the near end of the catheter body 1 and is connected with the second electrode 3 through a pull wire, and the handle 9 is used for drawing the pull wire to move along the axial direction of the catheter body 1 so as to control the bending of the bendable section 12.

Referring to fig. 5, in general, the anti-detachment medical catheter further includes a saline tube 7, and the saline tube 7 leads saline from the proximal end to saline holes of the first electrode 2 and the second electrode 3. In order to connect the saline tube 7 and the infusion pump, the catheter body 1 is further provided with a saline braided tube 8 at a proximal end to connect the saline tube 7, and a part of the saline braided tube 8 is exposed out of the proximal end of the handle and connected with the infusion pump through a connecting piece. The saline pipe 7 is easy to bend, and the saline braided pipe 8 is made of a high polymer material with braided wires and can resist deformation, so that the saline infusion passage can be prevented from being blocked due to bending of a pipeline at the handle.

In this embodiment, the safety wire 4 may be made of an insulating flexible material, such as a nylon wire, or a braided wire, a carbon wire, or other soft wire with high tensile strength, and the distal end of the safety wire is not damaged when the safety wire is disposed in the catheter body 1. Specifically, as shown in fig. 2, a first groove 100 is axially formed on a sidewall of a proximal end of the first core rod 22, the distal end of the safety wire 4 is bonded in the first groove 100, and the proximal end of the safety wire 4 is fixed to the catheter body 1, for example, the saline tube 7 in the catheter body 1. Specifically, the saline tube 7 is glue-injected with the saline braided tube 8, and the connection portion forms a glue injection section in which the proximal end of the safety wire 4 is fixed when the glue injection is formed.

[ example two ]

Referring to fig. 6, unlike the first embodiment, the safety wire 4 is wound around the proximal end of the first electrode 2 and then extends to the proximal end of the catheter body 1 along the first groove 100, and similarly, the safety wire 4 is adhered to the first electrode 2. In this embodiment, the safety thread 4 may also be a soft thread with high tensile strength, such as a nylon thread, a braided thread, or a carbon thread, so as to be wound around the thread.

Compared with the mode of fixing only on the side wall in the first embodiment, the gluing amount and the gluing range of the first embodiment are larger, and the connection strength is higher.

[ EXAMPLE III ]

In addition to the above-mentioned embodiments, the safety wire 4 is made of a soft wire material with high tensile strength, such as a nylon wire, a braided wire, or a carbon wire, in this embodiment, the inner core of the safety wire 4 may be made of a conductive rigid material, for example, the inner core is made of stainless steel or nickel-titanium metal, the surface of the inner core is covered with an insulating layer, and the insulating layer at the distal end is removed, so that the distal end of the safety wire 4 can be fixed on the first electrode 2 by welding, thereby improving the connection strength between the safety wire and the first electrode 2. The specific welding position and the welding square wire can be selected according to the softness degree of the safety wire 4, the safety wire 4 with higher hardness is suitable for direct side wall fixation, and the safety wire 4 with higher hardness can be fixed around the side wall.

Referring to fig. 7, generally, for an anti-drop medical catheter, a socket 91 and a protective tube 92 are arranged in the handle 9, the protective tube 92 is connected to a distal end of the socket 91, the socket 91 is electrically connected to an external device through an electrical connection joint to implement electrical stimulation, radiofrequency energy ablation and data transmission, after passing through the protective tube 92, the first electrode 2, the second electrode 3 and a lead of a temperature sensor are electrically connected to the socket 91, and glue is filled in the protective tube 92 to protect and position the leads.

In view of the protective tube 92 in the handle and the large space inside the protective tube 92, in the present embodiment, unlike the above embodiments, the proximal end of the safety wire 4 is fixed inside the protective tube 92 when injecting glue into the protective tube 92. When the safety wire 4 is made of stainless steel or nickel-titanium metal, the end face has high hardness, and if the safety wire is arranged on the catheter body 1, the catheter body 1 may be damaged in the arranging process or the using process, in this embodiment, the proximal end of the safety wire 4 is fixed in the handle, and the safety wire is kept away from the catheter body 1, so that the damage to the catheter body 1 can be avoided.

In addition, the inner core has been compromise for the safety wire 4 of metal material and has been difficult for the fracture and can the electrically conductive performance, on the one hand can with first electrode 2 stabilize connect in catheter body 1, on the other hand can act as the electrode wire of first electrode 2, for first electrode 2 provides the ablation energy, and two unifications help practicing thrift space and cost, reduce the preparation degree of difficulty.

[ EXAMPLE IV ]

Compared with the above embodiment, in the present embodiment, the anti-drop medical catheter further includes a sensing unit, the sensing unit includes a sensing portion and a conducting portion, the sensing portion is interposed between the first electrode 2 and the second electrode 3, and a sensing signal of the sensing portion is transmitted to an external device through the conducting portion, so as to be used for determining a change in the relative position of the first electrode 2 and the second electrode 3. For the medical catheter with dual-electrode anti-drop function, the first electrode 2 and the second electrode 3 are usually connected by glue, when the first electrode 2 and the second electrode 3 are connected as described in the first embodiment, glue is filled between the outer surface of the distal section 221 of the first core rod 22 and the inner surface of the second electrode head 31 to connect the two, and at this time, the sensing portion is sandwiched between the outer surface of the distal section 221 and the inner surface of the second electrode head 31, so as to sense whether the two are separated.

Optionally, the sensing portion and the conducting portion are integrally formed, and are detection leads, the distal ends of the detection leads are clamped between the first electrode 2 and the second electrode 3 after the external insulating coating is removed and a remaining metal material portion is clamped between the outer surface of the distal end section 221 and the inner surface of the second electrode head 31 to form the sensing portion, and a portion of the detection leads without the external insulating coating being removed extends to the socket 91 along the axial direction of the catheter body 1 and is connected with an external radio frequency device through the socket 91. Although the insulating coating at the distal end of the detection wire is removed, since the outer surface of the distal end section 221 and the inner surface of the second electrode tip 31 are connected by glue, the exposed conductive core at the distal end of the detection wire is insulated from the first electrode 2 and the second electrode 3 due to the glue in the non-detached state.

If the first electrode tip 21 and the second electrode tip 31 are connected in an insulated manner by using an insulating gasket as described in the first embodiment. The distal end of the detection wire is sandwiched between the insulating pad and the second electrode 3, specifically, may be sandwiched between the proximal end surface of the first insulating pad 6 and the distal end surface of the second electrode tip 31, or may be sandwiched between the outer surface of the second insulating pad and the inner surface of the second electrode tip 31, and similarly, when the first insulating pad 6/the second insulating pad and the second electrode 3 are connected by glue, the conductive core exposed at the distal end of the detection wire may be insulated from both the first electrode 2 and the second electrode 3 due to the existence of the glue in a non-separated state.

If the first electrode 2 is separated from the second electrode 3 during bending control, the distal end of the detection lead leaks out of the glue or breaks to leak out of the end face, and then contacts with blood, so that the resistance value of the detection lead is changed and is reflected to the interface of the radio frequency equipment.

As described in the first embodiment, the first electrode 2 and the second electrode 3 are porous, and can be used for mounting a lead, a temperature sensor, positioning sensing, and the like. In order to facilitate the arrangement of the lead wires, preferably, as shown in fig. 8, the first electrode 2 has a first placing hole 200, the second electrode 3 has a second placing hole 300, the first placing hole 200 is used for arranging a first temperature sensor, and the lead wires of the first temperature sensor pass through the second placing hole 300 and extend to the proximal end of the catheter body 1 to be connected with the socket 91. After the detection wire is arranged, the detection wire can also extend from the second placing hole 300 to the proximal end of the catheter body 1 to be connected with the socket 91. The second electrode 3 may further have a third seating hole (not shown) for seating a second temperature sensor. The first mounting hole 200 is a blind hole arranged along the axial direction, and the second mounting hole 300 and the third mounting hole are through holes arranged along the axial direction.

Because the lead of the temperature sensor arranged in the first electrode 2 penetrates through the second electrode 3, when the first electrode 2 and the second electrode 3 are separated, the lead of the temperature sensor arranged in the first electrode 2 has the risk of poor insulation or breakage, so that the temperature measurement of the first electrode 2 is failed, and the possibility of the separation of the electrodes can be reflected. However, when the first electrode 2 is separated from the second electrode 3, there is still a possibility that the lead of the temperature sensor disposed in the first electrode 2 will not fail, and therefore, the temperature measurement condition of the first electrode 2 can only be used as a reference for electrode separation, and cannot be used as a final judgment basis.

In this embodiment, the sensing portion may also be a biosensor, the conducting portion is a separate wire, and the biosensor and the wire are connected to constitute the sensing unit.

The biosensor is, for example, a glucose sensor, which is most commonly used, and measures the concentration of glucose in blood by contacting the blood when the first electrode 2 is separated from the second electrode 3. When the glucose concentration is displayed at the device end, the first electrode 2 and the second electrode 3 are separated. The glucose sensor can be arranged at the joint of the first electrode 2 and the second electrode 3, or a plurality of glucose sensors can be uniformly distributed around the position to improve the recognition rate.

[ EXAMPLE V ]

Different from the fourth embodiment, in the present embodiment, the sensing portion includes a pressure sensor 10, and the pressure sensor 10 may be a semiconductor pressure sensor or a piezoelectric force sensor, which is not limited in this application. When the second electrode 3 and the first electrode 2 are at risk of separation, firstly the second electrode 3 is deviated in a direction away from the first electrode 2 under the action of bending control, and then the stress condition between the first electrode 2 and the second electrode 3 is changed, so that when the pressure sensor 10 is used for sensing, the pressure sensor 10 is arranged between the second electrode 3 and the first electrode 2, and the connection state between the electrodes can be monitored in real time according to a pressure signal sensed by the pressure sensor 10, so that separation is prevented. The pressure sensors 10 may be disposed at one connecting surface, or may be uniformly distributed on the connecting surface to improve the recognition rate.

As described in the first embodiment, the first electrode 2 and the second electrode 3 are preferably insulated by the first insulating pad 6 and the second insulating pad. On the basis, referring to fig. 9, in the present embodiment, it is further preferable that the pressure sensor 10 is disposed between the proximal end surface of the first insulating pad 6 and the distal end surface of the second electrode 3. The proximal end face of the first insulating gasket 6 is a plane, which is more convenient for the arrangement of the pressure sensor 10 compared with the surface of the second insulating gasket, and when the second electrode 3 is separated from the first electrode 2, the pressure change at the end face joint is more obvious.

In addition, since the first insulating pad 6 has a larger thickness, a second groove can be formed at a position where the first insulating pad 6 faces the second electrode 3, the pressure sensor 10 is disposed in the second groove, and since glue is filled between the first insulating pad 6 and the second electrode 3, when the two are loosened, the pressure sensor 10 will also sense a change in the force value, and meanwhile, the pressure sensor 10 will not affect the connection strength between the first insulating pad 6 and the second electrode 3.

In summary, the anti-drop medical catheter provided in the embodiment of the present invention includes: the catheter comprises a catheter body, a first electrode, a second electrode and a safety wire; one end of the second electrode is connected to the far end of the catheter body, and the other end of the second electrode is in insulated connection with the first electrode; the safety wire is arranged along the axial extension of the catheter body, one end of the safety wire is fixed on the first electrode, and the other end of the safety wire is fixed at the near end of the catheter body. According to the anti-falling medical catheter, the first electrode and the catheter body are stably connected into a whole through the safety wire, so that the risk of disconnection between the first electrode and the second electrode is greatly reduced.

It should be noted that, in the embodiment of the present invention, a medical catheter for renal artery ablation is taken as an example, and those skilled in the art can understand that the anti-drop medical catheter according to the present invention may also be applied to treatment of other parts, such as the heart, and the present application does not limit this. In this specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, similar parts in the embodiments may be referred to one another, and different parts in the embodiments may also be used in combination with one another, which is not limited in the present invention.

It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims

1. A drop-resistant medical catheter, comprising: the catheter comprises a catheter body, a first electrode, a second electrode and a safety wire;

2. The anti-detachment medical catheter according to claim 1, wherein the proximal end surface of the first electrode has a first groove extending in a longitudinal direction, the safety wire is wound around the proximal end of the first electrode and extends to the proximal end of the catheter body along the first groove, and the safety wire is adhesively fixed to the first electrode.

3. The anti-drop medical catheter according to claim 1 or 2, wherein the proximal end of the catheter body includes a glue injection section in which the proximal end of the safety wire is fixed.

4. The drop-preventing medical catheter according to claim 3, wherein the catheter body includes a saline tube provided extending in the axial direction and a saline braided tube connected to a proximal end of the saline tube, the saline tube and the saline braided tube being glue-cast connected, a connecting portion forming the glue-cast section.

5. The anti-drop medical catheter as claimed in claim 3, wherein the catheter body further comprises a handle, a socket and a protection tube connected with a distal end of the socket are arranged in the handle, the protection tube is filled with glue, and a proximal end of the safety wire is fixed in the protection tube.

6. An anti-drop medical catheter as claimed in claim 4 or 5, wherein the safety wire is of an insulating flexible material.

7. The anti-drop medical catheter of claim 5, wherein the inner core of the safety wire is made of a conductive rigid material.

8. The anti-shedding medical catheter according to claim 1, further comprising a sensing unit including a sensing portion and a conducting portion, the sensing portion being interposed between the first electrode and the second electrode, a sensing signal of the sensing portion being transmitted to an external device through the conducting portion for determining a change in the relative position of the first electrode and the second electrode.

9. The anti-drop medical catheter of claim 8, wherein the sensing portion comprises a biosensor; or the sensing part is made of metal materials, and the sensing part is connected with the first electrode and the second electrode in an insulating mode.

10. The anti-drop medical catheter of claim 8, wherein the sensing portion comprises a pressure sensor, the first electrode and the second electrode are connected by an insulating gasket, the insulating gasket has a second groove on a surface thereof adjacent to the second electrode, and the pressure sensor is disposed in the second groove.

11. The anti-drop medical catheter of claim 1, wherein the first electrode has a first seating hole and the second electrode has a second seating hole, the first seating hole being for seating a first temperature sensor, a lead of the first temperature sensor passing through the second seating hole and extending to the proximal end of the catheter body.