Electrolytically detachable catheter device

Abstract

The present invention relates to an electrolytically detachable catheter device, comprising a developing marker, a detachable distal catheter segment, a proximal catheter segment, a support tube, a tube base, an electrode rod, an anode conductive wire, and a cathode conductive wire. By leveraging the electrolytic reaction principle, a predetermined metal detachment point of the catheter undergoes controllable oxidative decomposition, achieving detachment within a short time. The detachment point is configured as a hollow metal ring, which not only ensures a consistent catheter lumen, but also maintains the normal fracture force level of the catheter because the metal ring is welded and reinforced with metal reinforcement layers at both ends of the catheter body before detachment. A PTFE liner is arranged within the detachment point, and the PTFE liner has been pre-treated to have circumferential cracks. As long as the metal layer at the detachment point is electrolytically detached, the PTFE liner can be easily detached, thereby achieving detachment between the detachable distal catheter segment and the proximal catheter segment.

Description

An electrolytically detachable catheter device

[0001] This application claims priority to the Chinese patent application No. 202410423991.8, filed on April 10, 2024, and entitled "An electrolytically detachable catheter device". TECHNICAL FIELD

[0002] The present application relates to the field of medicine, and in particular to an electrolytically detachable catheter device. BACKGROUND

[0003] Arteriovenous malformation (AVM) is a congenital local cerebral vascular ontogenesis variation. There is a lack of capillary between the cerebral artery and the cerebral vein in the lesion site, which causes the direct connection between the artery and the vein, forming a short circuit between the artery and the vein, leading to a series of cerebral hemodynamic disorders, and clinically often showing repeated intracranial hemorrhage, partial or systemic seizure, transient ischemic attack and progressive neurological dysfunction, and is the second cause of intracranial spontaneous subarachnoid hemorrhage.

[0004] At present, for the treatment of arteriovenous malformation, liquid embolic glue (such as onyx glue) is mainly used for embolization treatment in clinic. The liquid embolic glue has good dispersibility and can coagulate in a short time in the blood, thereby achieving the purpose of embolization treatment. However, the liquid embolic glue must be delivered by a microcatheter. The traditional microcatheter often causes the adhesion of the distal end of the catheter to the embolic glue during the delivery of the liquid embolic glue, which makes it extremely difficult to pull out the catheter, and even serious adverse events may occur. Subsequently, a detachable catheter device appears on the market, but the existing detachable catheter on the market is separated by mechanical force, that is, a certain pulling force needs to be applied to the proximal segment of the catheter during the operation to achieve the purpose of separation. This detachable way has poor controllability and still has clinical adverse events caused by fluctuation of the pulling force, which has a use limitation.

[0005] SUMMARY

[0006] The purpose of the present application is to overcome the limitations of the prior art, and to provide an electrolytic detachable catheter device, which can overcome the limitations of the prior art, and can be separated quickly and controllably at a predetermined detachment zone under the action of a direct current, and can generate a small amount of metal ions during the separation process, without causing vascular toxicity. Specifically, the present application uses the principle of electrolytic reaction to make the predetermined metal detachment point of the catheter controllably oxidize and decompose, and completes the separation in a short time. The detachment point adopts the form of a hollow metal ring, which can ensure the uniform inner cavity of the catheter, and the metal ring is welded and reinforced with the metal reinforcing layer of the pipe body at both ends before separation, which can ensure the normal breaking force level of the catheter. A PTFE lining is arranged in the detachment point, and the PTFE lining is subjected to circumferential crack treatment in advance. After the electrolytic separation of the metal layer of the detachment point, the PTFE lining can easily complete the separation, thereby realizing the detachment of the detachable catheter distal segment and the catheter proximal segment.

[0007] To achieve the above purpose, the present application provides an electrolytic detachable catheter device, which comprises a catheter device including a developing mark, a detachable catheter distal segment, a catheter proximal segment, a support pipe, a pipe seat, an electrode rod, an anode conductive wire and a cathode conductive wire.

[0008] The developing mark is arranged at the distal end of the detachable catheter distal segment, and is used for developing the tip of the detachable catheter distal segment.

[0009] The proximal end of the detachable catheter distal segment is connected with the distal end of the catheter proximal segment, and a detachment point is arranged at the connection position. The detachable catheter distal segment can be detached from the catheter proximal segment at the detachment point.

[0010] The support pipe is arranged between the catheter proximal segment and the pipe seat, and is used for connecting the catheter proximal segment and the pipe seat.

[0011] The electrode rod comprises an outer layer pipe and an inner core arranged in the outer layer pipe. One end of the electrode rod is fixed on the pipe seat, and the other end is connected with an external direct current power supply.

[0012] The anode conductive wire penetrates through the catheter proximal segment and the support pipe, and is connected with the detachment point at the distal end and connected with the outer layer pipe of the electrode rod at the proximal end.

[0013] The cathode conductive wire penetrates through the catheter proximal segment and the support pipe, and is connected with the catheter proximal segment at the distal end and connected with the inner core of the electrode rod at the proximal end.

[0014] When the catheter device is located in a liquid containing electrolyte, the anode conductive wire, the cathode conductive wire, the detachment point and the electrode rod form a circuit loop. The detachment point undergoes anodic oxidation reaction and breaks and decomposes under the action of a continuous current, thereby realizing the detachment of the detachable catheter distal segment and the catheter proximal segment.

[0015] Preferably, the detachable catheter distal segment and the catheter proximal segment have the same layer structure, from outside to inside, the outer layer resin, the metal reinforcing layer and the PTFE inner lining;

[0016] The outer layer resin of the catheter proximal segment is pre-embedded with an anode conductive wire and a cathode conductive wire.

[0017] Preferably, the length of the release point is 0.1-1mm, and the release point has a single-layer structure or a double-layer structure.

[0018] The single-layer structure is a stainless steel layer.

[0019] The double-layer structure has, from outside to inside, a stainless steel layer and a PTFE inner lining, and the PTFE inner lining is pre-segmented or pre-cracked in the circumferential direction, so that when the stainless steel layer is broken and decomposed under the direct current electrolysis, the inner PTFE lining can be separated synchronously.

[0020] Further preferably, the distal end of the anode conductive wire is welded with the stainless steel layer of the release point to form a first welding point, and the proximal end is connected with the outer conductive metal tube of the electrode rod to form a third welding point.

[0021] The distal end of the cathode conductive wire is exposed on the outer layer of the catheter proximal segment to form a bare second welding point, and the proximal end is connected with the inner core of the electrode rod to form a fourth welding point.

[0022] In a dry state or in air, the anode conductive wire and the cathode conductive wire are insulated from each other and do not conduct electricity; when the catheter device is located in a liquid with electrolyte, an electric circuit loop is formed among the anode conductive wire, the cathode conductive wire, the release point and the electrode rod under the conductive effect of the electrolyte liquid.

[0023] Further preferably, the outer tube and the inner core of the electrode rod are made of stainless steel.

[0024] The outer tube is connected with the anode conductive wire to form a positive electrode, and the inner core is connected with the cathode conductive wire to form a negative electrode, the outer tube and the inner core are insulated in the positive electrode region, the outer tube and the inner core are in conductive contact in the negative electrode region, and the positive electrode region and the negative electrode region are isolated by insulation glue.

[0025] Further preferably, when the catheter device is located in a liquid containing electrolyte, the electric current flows from the positive pole of the electrode rod through the anode conductive wire, contacts the electrolyte in the liquid at the release point, and then flows through the liquid and returns to the cathode conductive wire at the second welding point, and finally returns to the negative pole of the electrode rod, thus forming a current loop. During the continuous action of the electric current, the release point undergoes electrolysis, the stainless steel layer of the release point undergoes anodic oxidation, and a small amount of ferrous ions are released. After the continuous action of the electric current, the release point breaks, so that the detachable catheter distal segment remains in the liquid containing electrolyte.

[0026] Preferably, the voltage output by the external DC power supply is 8-36V, and under the action of the continuous electric current, the stainless steel layer of the release point undergoes anodic oxidation and breaks, and the release and separation time is 8-600s.

[0027] Preferably, the tube seat is provided with a double channel, including a horizontal channel and a side channel which are in communication with each other.

[0028] The horizontal channel is in communication with the inner cavity of the proximal segment of the catheter through a support tube.

[0029] The side channel is used for placing the electrode rod, and an adhesive is provided in the side channel for fixing the electrode rod.

[0030] Preferably, the anode conductive wire and the cathode conductive wire are both metal inner cores with a high polymer insulating layer, the material of the insulating layer is PET, PTFE or PI, the material of the metal inner core is platinum-tungsten alloy, silver or stainless steel, and the diameter of the single conductive wire of the metal inner core is 0.05-0.15mm.

[0031] Preferably, the inner diameters of the detachable catheter distal segment, the catheter proximal segment and the support tube are the same, the inner diameter is 0.01-0.04 inches, and the length of the detachable catheter distal segment is 2-6cm.

[0032] The detachable catheter device provided by the embodiment of the present application can realize controllable oxidation decomposition of a predetermined metal detachment point of the catheter by means of electrolytic reaction principle, and can complete separation in a short time. The detachment point adopts the form of a hollow metal ring, which can ensure the uniform inner cavity of the catheter, and the metal ring and the metal reinforcing layer of the pipe body at both ends are welded and reinforced before separation, so as to ensure the normal breaking force level of the catheter. A PTFE lining is arranged in the detachment point, and the PTFE lining is subjected to circumferential crack treatment in advance. After the metal layer of the detachment point is electrolytically separated, the PTFE lining can be easily separated, so as to realize the detachment of the detachable catheter far section and the catheter near section. In the application of the catheter device in the clinical treatment process of AVM, the detachable catheter far section will be broken at the detachment point, so that the detachable catheter far section can be directly left in the blood vessel, and the problem of adhesion of the liquid embolism glue to the catheter and the problem of inability to withdraw the catheter can be avoided. Therefore, the design of the catheter device of the present application solves the problem of uncontrollable catheter withdrawal in the clinical treatment process of AVM, and the safety of the operation is higher and the controllability is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 is a structural schematic view of a detachable catheter device provided by the embodiment of the present application;

[0034] Fig. 2 is a sectional view of A-A in Fig. 1;

[0035] Fig. 3 is a sectional view of B-B in Fig. 1;

[0036] Fig. 4 is a sectional view of C-C in Fig. 1. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be further described in detail below by means of the drawings and embodiments.

[0038] The detachable catheter device provided by the embodiment of the present application can be used in various application scenarios, including but not limited to the treatment of cerebral arteriovenous malformations. Those skilled in the art can apply the detachable catheter device of the present application to the required scene according to actual needs, and the present application does not limit the application scenarios. Fig. 1 is a structural schematic view of a detachable catheter device provided by the embodiment of the present application. As shown in Fig. 1, the catheter device comprises a developing marker 11, a detachable catheter far section 12, a catheter near section 13, a support pipe 14, a pipe seat 15, an electrode rod 16, an anode conductive wire 17 and a cathode conductive wire 18. For the convenience of description, the side close to the user is called the proximal end, and the side far from the user is called the distal end. The structures and functions of each part of the detachable catheter device will be introduced in detail below in combination with Fig. 1.

[0039] The developing mark 11 is arranged at the distal end of the detachable catheter distal segment 12, and is used for developing the tip of the detachable catheter distal segment 12. During use of the catheter device, the user can identify the position of the detachable catheter distal segment 12 by the position of the developing mark 11.

[0040] The detachable catheter distal segment 12 and the catheter proximal segment 13 are connected at the proximal end of the detachable catheter distal segment 12 and the distal end of the catheter proximal segment 13, and a release point 19 is arranged at the connection position. The detachable catheter distal segment 12 can be released from the catheter proximal segment 13 at the release point 19. In some embodiments, as shown in FIGS. 2 and 3, the detachable catheter distal segment 12 and the catheter proximal segment 13 have the same layer structure. The detachable catheter distal segment 12 comprises, from outside to inside, an outer layer resin 121, a metal reinforcing layer 122, and a PTFE inner liner 123. The catheter proximal segment 13 comprises, from outside to inside, an outer layer resin 131, a metal reinforcing layer 132, and a PTFE inner liner 133. The outer layer resin 131 of the catheter proximal segment 13 is pre-embedded with the anode conductive wire 17 and the cathode conductive wire 18. The pre-embedding of the anode conductive wire 17 and the cathode conductive wire 18 does not affect the delivery outer diameter of the entire catheter.

[0041] Further, as shown in FIG. 4, the release point 19 can have a single-layer structure or a double-layer structure. When the release point 19 has the single-layer structure, it is only a stainless steel layer. When the release point 19 has the double-layer structure, the double-layer structure comprises, from outside to inside, a stainless steel layer 191 and a PTFE inner liner 192. In order to facilitate the release and separation of the detachable catheter distal segment 12, the PTFE inner liner 192 at the release point 19 is pre-divided or pre-cracked in the circumferential direction. When the stainless steel layer is broken and decomposed under the direct current electrolysis, the PTFE inner liner 192 in the inner layer can be easily separated due to the pre-set cracks. It should be noted that the length of the release point 19 is preferably 0.1-1 mm, and the outer stainless steel layer 191 is in a bare state. The release point 19 adopts the form of a hollow metal ring, which not only ensures the consistent inner cavity of the catheter, but also is welded and reinforced with the metal reinforcing layers of the two end pipe bodies before separation, so as to ensure the normal breaking force level of the catheter.

[0042] The support pipe 14 is arranged between the catheter proximal segment 13 and the pipe base 15, and is used for connecting the catheter proximal segment 13 and the pipe base 15. The support pipe 14 is mainly used for the transition between the catheter proximal segment 13 and the pipe base 15, and also plays a role in protecting the anode conductive wire 17 and the cathode conductive wire 18 from being bent.

[0043] The pipe base 15 is provided with a double channel, and is used for fixing the electrode rod 16. The structure of the pipe base 15 specifically comprises a horizontal channel 151 and a side channel 152 which are in communication with each other. The horizontal channel 151 is in communication with the inner cavity of the catheter proximal segment 13 through the support pipe 14. The side channel 152 is used for placing the electrode rod 16, and the adhesive 20 is arranged in the side channel 152, which is used for fixing the electrode rod 16.

[0044] The electrode rod 16 is structured to include an outer tube 161 and an inner core 162 disposed within the outer tube 161, and the outer tube 161 and the inner core 162 of the electrode rod 16 are preferably made of stainless steel. One end of the electrode rod 16 is fixed to the tube seat 15, and the other end is connected to an external DC power source. In some embodiments, the voltage output by the external DC power source is preferably 8-36V. Under the action of the continuous current, the stainless steel layer 191 of the release point 19 undergoes anodic oxidation reaction and breaks down. The release and separation time is 8-600s. It can be understood that those skilled in the art can select and set the output voltage and the release and separation time according to different application scenarios.

[0045] In some embodiments, the electrolytically releasable catheter device has a uniform inner diameter throughout. Specifically, the inner diameters of the separable catheter distal section 12, the catheter proximal section 13, and the support tube 14 are the same, and the inner diameter ranges from 0.01 to 0.04 inches. The preferred length of the separable catheter distal section 12 is 2-6cm. It can be understood that those skilled in the art can select and set the inner diameter and the length of the separable catheter distal section 12 according to different application scenarios.

[0046] The anode conductive wire 17 penetrates through the catheter proximal section 13 and the support tube 14, and is partially embedded in the outer resin layer 131 of the catheter proximal section 13. The distal end of the anode conductive wire 17 is connected to the release point 19, and the proximal end is connected to the outer tube 161 of the electrode rod 16.

[0047] The cathode conductive wire 18 penetrates through the catheter proximal section 13 and the support tube 14, and is partially embedded in the outer resin layer 131 of the catheter proximal section 13. The distal end of the cathode conductive wire 18 is connected to the catheter proximal section 13, and the proximal end is connected to the inner core 162 of the electrode rod 16.

[0048] It should be noted that the anode conductive wire 17 and the cathode conductive wire 18 described above are both metal inner cores with a high-molecular insulating layer. The insulating layer material includes but is not limited to PET (polyethylene terephthalate), PTFE (polytetrafluoroethylene), or PI (polyimide). The metal inner core material includes but is not limited to platinum-tungsten alloy, silver, or stainless steel. The diameter of a single conductive wire of the metal inner core preferably ranges from 0.05 to 0.15mm.

[0049] Further, the outer layer stainless steel tube of the electrode rod 16 is connected with the anode conductive wire 17 to form a positive electrode, and the stainless steel inner core of the electrode tube is connected with the cathode conductive wire 18 to form a negative electrode. In the positive electrode area section, the stainless steel outer layer tube 161 is insulated from the stainless steel inner core 162, and in the negative electrode area section, the outer layer tube 161 and the inner core 162 are in conductive contact. The entire positive electrode section and the negative electrode section are isolated by the insulating glue 21, and further, the end part is also bonded by the bonding glue 22, which is used to fix the inner core and the outer layer tube 161 and forms a small taper.

[0050] Based on the understanding of the structure of the catheter device of the present embodiment, the working principle and process thereof will be introduced below in combination with FIGS. 1 to 4.

[0051] In use of the catheter device, the distal end of the catheter device is placed in a liquid with electrolyte, such as human blood. When the catheter device is located in the liquid with electrolyte, the anode conductive wire 17, the cathode conductive wire 18, the release point 19 and the electrode rod 16 form a circuit loop. The release point 19 is subjected to an anodic oxidation reaction and breaks down under the action of the continuous current, thereby realizing the release of the separable catheter distal section 12 from the catheter proximal section 13.

[0052] In a specific example, the distal end of the anode conductive wire 17 is welded with the stainless steel layer of the release point 19 to form a first welding point 100, and the proximal end is connected with the outer layer conductive metal tube 161 of the electrode rod 16 to form a third welding point 300. The distal end of the cathode conductive wire 18 is exposed on the outer layer of the catheter proximal section 13 to form a metal exposed point, i.e., a second welding point 200, and the proximal end is connected with the inner core 162 of the electrode rod 16 to form a fourth welding point 400. In a dry state or in air, the anode conductive wire 17 and the cathode conductive wire 18 are insulated and not conductive with each other. When the catheter device is located in the liquid with electrolyte, an electric circuit loop is formed among the anode conductive wire 17, the cathode conductive wire 18, the release point 19 and the electrode rod 16 under the conductive action of the electrolyte in the liquid. When the catheter device is located in the liquid with electrolyte, the current flows from the positive electrode of the electrode rod 16 through the anode conductive wire 17, the release point 19, contacts the electrolyte in the liquid, and then returns to the cathode conductive wire 18 through the second welding point 200, and finally returns to the negative electrode of the electrode rod 16, thereby forming a current loop. In the process of the continuous current, the release point 19 is subjected to an electrolytic reaction, the stainless steel layer 161 of the release point 19 is subjected to an anodic oxidation reaction, and a small amount of ferrous ions is released. Under the continuous action of the current, the release point 19 breaks, so that the separable catheter distal section 12 is left in the liquid with electrolyte.

[0053] In order to more clearly describe the application of the catheter device, the use process and principle of the catheter device are further described below by taking the application of the catheter device in a blood vessel as an example. When the catheter device is located in the blood vessel and in contact with blood, an external direct current source is connected through the electrode rod 16, and a direct current voltage of 8-36V is input, and the current flows from the anode of the electrode rod 16 through the anode conductive wire 17 to the contact point 19, contacts the conductivity of the blood electrolyte, and the current flows through the blood and returns to the cathode conductive wire 18 through the metal exposed point, that is, the second welding point 200, and finally returns to the negative electrode of the electrode rod 16, thus forming a complete current loop. During the continuous action of the current, the contact point 19 actually undergoes an electrolysis reaction, and the stainless steel contact point 19 will quickly undergo an anodic oxidation reaction and mainly release trace amounts of ferrous ions. After 8-600s of current action time, the contact point 19 will break, so that the detachable catheter distal segment 12 is directly left in the blood vessel, and the problem of adhesion of the liquid embolization glue to the catheter and the inability to withdraw the catheter is solved, thus solving the problem of uncontrollable catheter withdrawal in the AVM clinical treatment process through the design of the catheter device, and the safety of the operation is higher and the controllability is stronger.

[0054] The detachable catheter device provided by the embodiment of the present application realizes controllable oxidation decomposition of the predetermined metal contact point of the catheter by means of the electrolysis reaction principle, and completes separation in a short time. The contact point is in the form of a hollow metal ring, which not only ensures the uniform inner cavity of the catheter, but also is welded and reinforced with the metal reinforcing layer of the pipe body at both ends before separation, so as to ensure the normal breaking force level of the catheter. A PTFE lining is arranged in the contact point, and the PTFE lining is subjected to circumferential crack treatment in advance. As long as the metal layer of the contact point is electrolytically separated, the PTFE lining can easily complete the separation, so that the detachable catheter distal segment and the catheter proximal segment are separated.

[0055] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0057] In the description, the terms "one specific embodiment", "some embodiments", "one embodiment", etc. are described to mean that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The illustrative examples given are not necessarily to be construed as applying to only one embodiment or example. Furthermore, the describing particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0058] The above detailed description describes the purpose, technical solutions and beneficial effects of the application. It should be understood that the above description is only a specific embodiment of the application and is not intended to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. An electrolytically detachable catheter device, characterized in that: The electrolytically detachable catheter device comprises a developing marker, a detachable distal catheter section, a proximal catheter section, a support tube, a tube seat, an electrode rod, an anode conductive wire and a cathode conductive wire; wherein, The visualization mark is provided at the distal end of the distal section of the detachable catheter and is used for visualization of the distal end of the distal section of the detachable catheter; The proximal end of the detachable catheter distal section is connected to the distal end of the catheter proximal section, and a release point is provided at the connection, and the detachable catheter distal section can be released from the catheter proximal section at the release point; The support tube is arranged between the proximal section of the catheter and the tube seat, and is used to connect the proximal section of the catheter and the tube seat; The electrode rod comprises an outer tube and an inner core arranged in the outer tube, one end of the electrode rod is fixed to the tube holder, and the other end is connected to an external DC power supply; The anode conductive wire penetrates the proximal section of the catheter and the support tube, the distal end of the wire is connected to the release point, and the proximal end is connected to the outer tube of the electrode rod; The cathode conductive wire passes through the proximal section of the catheter and the support tube, with the distal end connected to the proximal section of the catheter and the proximal end connected to the inner core of the electrode rod; When the catheter device is located in a liquid with an electrolyte, the anode conductive wire, the cathode conductive wire, the release point and the electrode rod form a circuit loop. Under the action of a continuous current, the release point undergoes an anodic oxidation reaction and breaks and decomposes, thereby achieving the release of the distal section of the detachable catheter and the proximal section of the catheter.

2. The electrolytically detachable catheter device according to claim 1, wherein: The distal section of the detachable catheter and the proximal section of the catheter have the same layer structure, which is, from outside to inside, an outer resin layer, a metal reinforcement layer and a PTFE lining; Anode conductive wires and cathode conductive wires are pre-embedded in the outer layer resin of the proximal section of the catheter.

3. The electrolytically detachable catheter device according to claim 1, wherein: The length of the release point is 0.1-1 mm, and the release point is a single-layer structure or a double-layer structure; Wherein, the single-layer structure is a stainless steel layer; The double-layer structure is composed of a stainless steel layer and a PTFE lining from the outside to the inside. The circumferential direction is first split or cracked so that the inner PTFE lining can be separated simultaneously after the stainless steel layer is broken and decomposed under the direct current electrolysis.

4. The electrolytically detachable catheter device according to claim 3, wherein: The distal end of the anode conductive wire is welded to the stainless steel layer at the release point to form a first welding point, and the proximal end is connected to the outer conductive metal tube of the electrode rod to form a third welding point; The distal end of the cathode conductive wire is exposed on the outer layer of the proximal section of the catheter to form an exposed second welding point, and the proximal end is connected to the inner core of the electrode rod to form a fourth welding point; When in a dry state or in air, the anode conductive wire and the cathode conductive wire are insulated from each other and do not conduct electricity; when the catheter device is located in a liquid with an electrolyte, under the conductive effect of the electrolyte liquid, a circuit loop is formed between the anode conductive wire, the cathode conductive wire, the release point and the electrode rod.

5. The electrolytically detachable catheter device according to claim 4, wherein: The outer tube and inner core of the electrode rod are made of stainless steel; Among them, the outer tube is connected to the anode conductive wire to form a positive electrode, and the inner core is connected to the cathode conductive wire to form a negative electrode. In the positive electrode area, an insulation setting is adopted between the outer tube and the inner core. In the negative electrode area, conductive contact is achieved between the outer tube and the inner core, and the positive electrode segment and the negative electrode segment are isolated by insulating glue.

6. The electrolytically detachable catheter device according to claim 5, wherein: When the catheter device is located in a liquid with an electrolyte, the current flows from the positive electrode of the electrode rod through the anode conductive wire through the release point, contacts the electrolyte in the liquid, and the current returns to the cathode conductive wire through the liquid and the second welding point, and finally returns to the negative electrode of the electrode rod, thus forming a current loop. During the continuous action of the current, the release point undergoes an electrolytic reaction, the stainless steel layer at the release point undergoes an anodic oxidation reaction, and releases a trace amount of ferrous ions. After the continuous action of the current, the release point breaks, thereby leaving the distal section of the detachable catheter in the liquid with the electrolyte.

7. The electrolytically detachable catheter device according to claim 1, wherein: The voltage output by the external DC power supply is 8-36V. Under the action of continuous current, the stainless steel layer at the release point undergoes an anodic oxidation reaction and fractures and decomposes. The release separation time is 8-600s.

8. The electrolytically detachable catheter device according to claim 1, wherein: The tube base is a dual-channel arrangement, comprising a horizontal channel and a side channel that are interconnected; Wherein, the horizontal channel is connected with the inner cavity of the proximal section of the catheter through the support tube; The side channel is used for placing the electrode rods, and adhesive is provided in the side channel for fixing the electrode rods.

9. The electrolytically detachable catheter device according to claim 1, wherein: The anode conductive wire and the cathode conductive wire are both metal cores with a polymer insulating layer, the insulating layer is made of PET, PTFE or PI, the metal core is made of platinum tungsten alloy, silver or stainless steel, and the diameter of a single conductive wire of the metal core ranges from 0.05 to 0.15 mm.

10. The electrolytically detachable catheter device according to claim 1, wherein: The inner diameters of the detachable catheter distal section, the catheter proximal section, and the support tube are the same, ranging from 0.01 to 0.04 inches, and the length of the detachable catheter distal section is 2 to 6 cm.

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