Bipolar high-frequency electric snare

Abstract

A bipolar high-frequency electric snare, comprising a snare assembly (1) and a sleeve (2). The sleeve (2) is configured for fixing the snare assembly (1), and there are one or more sleeves (2). The bipolar snare can not only form a current loop, but also avoid a short circuit of an instrument, thereby reducing damage to the serosa layer of the intestinal wall and reducing the possibility of complications such as bleeding and perforation.

Description

Bipolar high-frequency electric snare TECHNICAL FIELD

[0001] The present application belongs to the field of medical devices, and particularly relates to a bipolar high-frequency electric snare. BACKGROUND

[0002] Currently, monopolar electric snares are used in the market. The positive pole of a high-frequency device is connected with the electrode of the electric snare, and the negative pole is connected with a negative pole plate which is attached to the surface of the human body. When the power supply of the high-frequency device is turned on, the current passes through the electric snare, the human body and the negative pole plate to form a current loop to achieve the effect of cutting polyps. During operation, if the negative pole plate is loose, the current passing through the negative pole plate will generate high temperature, which is easy to cause burns on the contact part of the human body.

[0003] The prior art is an invention patent named bipolar electrosurgical snare, and the publication number of the invention patent is US20050171532A1. The invention discloses a bipolar electrosurgical instrument comprising an introducer having a channel therein and a conductive snare slidably positioned within the channel and slidable between an undeployed position in which the conductive snare is substantially retracted within the channel and a deployed position in which a distal portion of the snare extends outwardly from the channel. The conductive snare is substantially insulated along its length but has an active electrode and a return electrode exposed through predetermined exposed portions. The instrument further comprises a retaining element at the distal end of the snare for securing the distal end of the snare to the introducer to form a loop configuration of the snare, and at least one fluid delivery channel extending through the introducer between a fluid inlet and a fluid outlet at the distal end of the introducer and located adjacent the exposed portions of the snare. The operation steps of the invention are relatively complicated, and the cutting effect is poor. SUMMARY

[0004] The purpose of the present application is to provide a bipolar high-frequency electric snare which cooperates, has high operation precision and has a modular design.

[0005] The technical scheme adopted by the present application to achieve the above purpose is as follows:

[0006] The bipolar high-frequency electric snare comprises a snare assembly and a sleeve, and the sleeve is used for fixing the snare assembly. The sleeve is one or more.

[0007] The snare assembly comprises a first wire and a second wire which are not in contact with each other. The free ends of the first wire and the second wire are connected through a structural member. An insulating tube is wrapped on the first wire along the extension direction of the first wire. The first wire has an exposed section.

[0008] The first wire and the second wire in the structure have a non-contact spacing distance, and the first wire has an exposed section without the wrapping of the insulating tube on the side of the structure.

[0009] The snare is generally used for cutting polyps or lesion tissues. In the prior art, a monopolar snare is generally used to cut polyps or lesion tissues, and in the use of the monopolar snare, a negative plate needs to be attached to the patient's body during the operation, which is not only cumbersome to operate, but also may cause skin burns due to overheating if the negative plate is not firmly attached or falls off, increasing the risk of the patient, or causing a short circuit to cause the instrument to fail. The present application adopts a bipolar snare, that is, the first wire and the second wire are connected to two electrodes respectively, and in the process of snaring the polyps or lesion tissues, the first wire and the second wire are in contact with the human tissues at the same time, in other words, the current flows in the direction of the first wire, the tissue, and the second wire or in the opposite direction. When the lesion tissue is removed, a current loop is formed, and the instrument short circuit is avoided. The use of the bipolar snare can reduce the damage to the intestinal wall serosa and reduce the possibility of complications such as bleeding and perforation. The present application adopts a modular design, which has the characteristics of easy maintenance, disassembly, assembly, and parameter adjustment.

[0010] The first wire and the second wire have free ends in the extension direction of the sheath tube, and the free ends of the first wire and the second wire are non-contact connected through the structure. It should be noted that the structure is made of insulating material to prevent short circuit of the first wire and the second wire. The snare formed between the sheath tube and the structure can be elliptical, polygonal or circular.

[0011] Further, the end of the structure away from the first wire and the second wire is arc-shaped. When the sheath tube enters the human body through the endoscope forceps channel, the snare assembly should be in a closed state at this time, and the snare assembly is accommodated in the sheath tube as a whole, but the structure plays a limiting role, that is, the limiting position is outside the end of the sheath tube. By setting the end of the structure away from the first wire and the second wire as arc-shaped, it is beneficial to the smoothness of the sheath tube entering the human body.

[0012] Further, the current through the first wire and the second wire is alternating current. Preferably, the current through the first wire and the second wire is high-frequency alternating current. The high-frequency alternating current is used to cauterize the lesion tissue and to stop bleeding of the wound.

[0013] Further, the first wire and the second wire are made of metal material. Further, the first wire and the second wire are made of conductive metal material.

[0014] The first cutting wire and the second cutting wire are fixed by a sleeve. The sleeve has no less than one sleeve hole. When the sleeve has one sleeve hole, the first cutting wire and the second cutting wire pass through the sleeve hole, and the fixing of the first cutting wire and the second cutting wire is realized by heat shrinkage or adhesion. When the sleeve has two sleeve holes, the first cutting wire and the second cutting wire pass through the corresponding sleeve holes respectively, and the fixing of the first cutting wire and the second cutting wire is realized by heat shrinkage or adhesion. When the sleeve has more than two sleeve holes, the first cutting wire and the second cutting wire pass through the symmetrically arranged sleeve holes. It should be noted that the first cutting wire and the second cutting wire can pass through the same sleeve hole, and the fixing of the first cutting wire and the second cutting wire is realized by heat shrinkage or adhesion. The unused sleeve hole can realize the air pressure balance inside and outside the sheath tube, improve the smoothness of the movement of the sleeve assembly, improve the smoothness of the expansion and closure of the sleeve assembly, and further improve the operation accuracy of the bipolar high-frequency loop snare.

[0015] It should be noted that the sleeve is arranged along the sheath tube, and the sleeve moves along the extension direction of the sheath tube when the sleeve assembly expands and closes. The sheath tube can be made of flexible material, that is, when the sheath tube enters the human body through the endoscope channel, the sheath tube is passively bent due to the physiological curvature of the human body. The prior art usually uses a double-lumen tube to realize the reciprocating movement of the first cutting wire and the second cutting wire. However, due to the bending, the strokes of the first cutting wire and the second cutting wire are inconsistent, which further causes that the sleeve assembly cannot completely cut the lesion tissue during expansion and closure. More specifically, when the closed sleeve assembly cuts the lesion tissue, the shorter cutting wire will enter the sheath tube first, and the longer cutting wire will not be completely retracted into the sheath tube, which further causes that the lesion tissue cannot be completely cut, resulting in the failure of the device. Compared with the prior art, the sleeve is arranged to realize that the first cutting wire and the second cutting wire on both sides are synchronized in the extension and retraction in the sheath tube even in the case of bending of the sheath tube, which further ensures that the lesion tissue can be completely cut.

[0016] Further, the sleeve is made of insulating material.

[0017] The sleeve is one or more. The arrangement of the sleeve can further improve the smoothness of the movement of the sleeve in the sheath tube in the bent state. In addition, the sleeve can also protect the first cutting wire and the second cutting wire, preventing the first cutting wire and the second cutting wire from being bent, broken or failed due to excessive bending angle.

[0018] Because the first cutting wire is covered with an insulating tube along its extension direction, the insulating tube prevents the need for additional insulating pads or sleeves to separate the first and second cutting wires during cannulation. This helps reduce the inner diameter of the cannula, resulting in a reduction in the overall diameter and volume of the cannula. This facilitates adaptation to different outer sheaths, enabling the cannula to handle a wider range of surgical environments. Furthermore, as the cannula's weight is reduced, the control of the opening and closing process of the loop assembly can be made more precise, further improving surgical accuracy and success rates.

[0019] The insulating tube covers the first cutting wire and is immobile during normal operation. This ensures that the insulating tube cannot move freely along the length of the first cutting wire during the surgical procedure, preventing a short circuit between the first and second cutting wires. Furthermore, the fixed insulating tube ensures that the length of the exposed section on the first cutting wire remains constant without human intervention, improving cutting precision.

[0020] It should be noted that the part of the insulating tube that comes into contact with the tissue will not cause damage to the tissue and cannot cut the diseased tissue.

[0021] The first cutting wire has an exposed section that is not wrapped with an insulating tube. The first and second cutting wires can only cut tissue through the exposed sections of the second and first cutting wires. This design reduces the effective cutting length of the first cutting wire, thereby achieving more concentrated energy and improving both cutting efficiency and cutting effect.

[0022] Furthermore, it should be noted that the exposed section is located on one side of the structural component. When the sliding component drives the collar assembly to unfold and close in the outer sheath, the exposed section of the first cutting wire and the second cutting wire can cut the polyp or lesion component.

[0023] Furthermore, the length of the exposed segment should be no less than 6mm. It should be noted that, due to the needs of different surgical environments, the length of the exposed segment can be adjusted or replaced to adjust or replace the ringing device to meet the needs of different surgical environments, thereby reducing costs and improving efficiency.

[0024] According to one embodiment of the present invention, it further includes an outer sheath tube and a handle assembly. The outer sheath tube is connected to the handle assembly, and the collar assembly is housed within the outer sheath tube. The handle assembly includes a handle base, and a sliding member that can move along a first direction is slidably mounted on the handle base. The other ends of the first and second slicing wires are both connected to the sliding member. The sliding member is used to drive the collar assembly to unfold and close within the outer sheath tube.

[0025] The outer sheath is used for accommodating the loop assembly, and the loop assembly is expanded and closed in the outer sheath by the sliding member, so that the expansion and closure of the loop assembly can be controlled by manually controlling the sliding member. The sliding member can move along the first direction on the handle base body, and in the application, the first direction includes but is not limited to the length direction of the handle assembly or the extension direction based on the length direction of the handle.

[0026] It should be noted that the sliding member provides energy for the first cutting wire and the second cutting wire. More specifically, the sliding member provides high-frequency alternating current for the first cutting wire and the second cutting wire to achieve normal cutting of the first cutting wire and the second cutting wire.

[0027] Further, the handle base body is provided with a first matching member matched with the first direction, and the sliding member is provided with a second matching member, and the first matching member and the second matching member can realize the sliding of the sliding body along the first direction. The first matching member includes but is not limited to a guide groove and a guide rod, and the second matching member includes but is not limited to a guide block and a guide port.

[0028] Further, the outer sheath is made of PTFE, and the structure of the outer sheath is a single-lumen tube.

[0029] According to an embodiment of the application, the handle base body and the sliding member are each provided with not less than one gripping ring.

[0030] The gripping ring is used to realize the operation of the snare by the operator. Further, the gripping ring on the handle base body is arranged at the end of the handle base body away from the outer sheath, and the handle base body is provided with not more than two gripping rings, and the sliding member is provided with at least one gripping ring, and the gripping ring arranged on the sliding member can be on the side of the sliding member or can surround the sliding member. Further, the gripping ring arranged on the sliding member can be closed or open.

[0031] Further, a flexible ring can be arranged on the inner side wall of the gripping ring. The flexible ring can reduce the squeezing feeling of the fingers of the operator during use of the device, which is beneficial to improve the operation accuracy of the operator during long-time operation and prevent fatigue.

[0032] Further, the inner side wall of the gripping ring has a curved structure. The curved structure can prevent the fixed compression of the fingers of the operator during the movement of the gripping ring along the handle base body from causing a decrease in accuracy, and can improve the holding experience and also has an anti-slip effect.

[0033] According to an embodiment of the application, the sliding member includes a sliding base body, and the sliding base body is provided with a conductive assembly in a matched manner, and the conductive assembly is used to supply power to the loop assembly.

[0034] According to an embodiment of the present application, the sliding base body is provided with a base corresponding to the conductive assembly, the base is provided with a base hole corresponding to the first cutting wire and the second cutting wire, and a drum spring is arranged in the base hole.

[0035] It should be noted that the handle base body is provided with a sliding groove, and the sliding groove is arranged in cooperation with the base. In other words, when the sliding base body drives the base to move in the first direction, the base cooperates with the sliding groove to realize the movement of the base in the first direction. In this process, the base drives the first cutting wire and the second cutting wire to move in the first direction.

[0036] Further, the base is also provided with a catheter, wherein the catheter is connected with the base by mechanical embedding or adhesion. The catheter is used to control the first cutting wire and the second cutting wire. In other words, the first cutting wire and the second cutting wire are accommodated in the catheter, and the catheter is communicated with an outer sheath. It should be noted that when the sliding member moves to the limit distance away from the outer sheath, the catheter is still in communication with the outer sheath. The arrangement of the catheter can prevent the first cutting wire and the second cutting wire from bending or separating during the movement of the sliding member in the first direction, and can realize the consistency of the movement of the first cutting wire and the second cutting wire.

[0037] Further, the catheter is made of rigid material.

[0038] It should be noted that the base and the sliding base body can be clamped. The sliding base body is provided with a base groove corresponding to the base hole. The conductive base body is provided with a third cooperating member, and the inner wall of the base groove is provided with a fourth cooperating member. The third cooperating member and the fourth cooperating member are used to realize the clamping connection of the conductive base body and the base, and to ensure the power supply of the conductive base body to the first cutting wire and the second cutting wire. This can prevent the conductive base body from being separated from the base or from being in poor contact during operation, thereby causing the failure of the operation or causing harm to the patient. More specifically, the third cooperating member is a clamping block, and the fourth cooperating member is a cooperating groove, i.e. the clamping block is fixed by buckling with the cooperating groove.

[0039] The first cutting wire and the second cutting wire are respectively provided with a base hole, and the conductive assembly is arranged corresponding to the base hole, so as to ensure the power supply of the conductive assembly to the first cutting wire and the second cutting wire. More specifically, the first cutting wire and the second cutting wire are embedded in the base hole of the base and are respectively connected with the drum spring. The two drum springs are arranged in cooperation with the pin, and the power supply of the first cutting wire and the second cutting wire is realized by the pin of the conductive assembly.

[0040] The drum spring is embedded in the corresponding base hole.

[0041] Further, the drum spring has a horn-shaped structure on both sides. The drum spring is conducive to firm cooperation with the pin, that is, to improve the stability of the pin in supplying power to the first and second cutters. Moreover, the setting direction of the drum spring is perpendicular to the first moving direction, so that the perpendicularity of the pin and the drum spring can be maintained through the buffering effect of the drum spring during the movement of the base, thereby maintaining the state of the conductive assembly and reducing the risk of the conductive assembly falling off.

[0042] According to an embodiment of the present application, the conductive assembly comprises a conductive base body, and the conductive base body is provided with symmetrically arranged conductive tabs. The conductive tabs are provided with notches on the side facing the sliding base body. The notches are matched with pins protruding from the conductive base body.

[0043] The conductive assembly is used to connect with an external high-frequency generator and transmit the current of the external high-frequency generator to the first or second cutter. The corresponding arrangement of the pins and the notches enables the pins to be more flexible in cooperating with the conductive tabs. It should be noted that the arrangement of the notches enables the pins and the conductive tabs to be in contact connection. It should be noted that the pins are arranged in cooperation with the drum springs.

[0044] It should be noted that, since high-frequency alternating current is used, the cooperation between the pins and the drum springs can be exchanged. In other words, the cooperation between the conductive assembly and the base is not positive or negative, which is conducive to the convenience of assembly between the conductive assembly and the base.

[0045] Further, the pins are replaceable. This enables the conductive connector to be modularly designed, and the pins can be replaced or produced according to the size of different base holes, thereby saving costs and improving the simplicity of replacement.

[0046] Further, the notches are provided with a buffer section. It should be noted that the buffer section can reduce the possibility of damage and bending of the pins during cooperation with the drum springs. That is, when the pins are subjected to a large impact force in the length direction, the buffer section can absorb the impact and control the position of the pins, so that the length of the pins protruding from the conductive base body is controllable and limited. That is, when the pins are compressed and retracted into the buffer section, they will have a force to return to the original position, so that the length of the pins protruding from the conductive base body returns. It should be noted that the force herein includes but is not limited to elastic force or pressure.

[0047] Further, the conductive tabs are bent. The bent conductive tabs can improve the ability of the notches to absorb impact force, and the bent arrangement can adapt to external cold and heat, preventing the conductive tabs from being disconnected from the pins or the drum springs of their input ends after the temperature changes. In addition, the precision requirement of the bent conductive tabs is lower than that of straight conductive tabs, which is conducive to the control of production and replacement costs.

[0048] Further, the pin is made of conductive material.

[0049] More specifically, the pin is made of metal conductive material. Since the device will inevitably separate the pin and the conductive base from the corresponding receiving device during use, the material selection of the pin will affect the service life of the pin and the overall device. Using metal material can improve the service life of the pin and reduce the possibility of bending or breaking the pin.

[0050] When the lesion tissue is removed, the high-frequency current passes through the electrode plug, the conductive insert, the pin, the coil spring, the first cutting wire, the lesion tissue, the second cutting wire, the coil spring, the pin, the conductive insert, and the electrode plug in turn, and finally returns to the high-frequency generator. The high-frequency current passes through the lesion tissue and uses the thermal effect of the high-frequency current to complete the removal of the lesion tissue.

[0051] According to an embodiment of the present application, the handle base is provided with one or more than one limiting block, and the limiting block is used to limit the limit position of the sliding member.

[0052] Through the limiting block, the limit distance of the sliding member in the first direction can be controlled, which is beneficial to the control of the distance by the operator and prevents the position of the ferrule assembly from being excessively changed due to tension or mistake of the operator during the operation of the sliding member.

[0053] Further, the position of the limiting block can be adjusted, that is, the size of the expansion of the ferrule assembly can be controlled in different surgical environments.

[0054] According to an embodiment of the present application, the outer sheath is sleeved with a protective sleeve along the extension direction of the outer sheath, and the protective sleeve is connectable with the handle base.

[0055] The protective sleeve is used to protect the outer sheath. The protective sleeve and the handle base can be connected by means of clamping or threaded connection, so as to fix the protective sleeve.

[0056] It should be noted that the handle base is provided with a connecting piece on the side facing the ferrule assembly, and the connecting piece is used to connect and fix the outer sheath. The connecting piece comprises a connecting base. The connecting base is made of metal or hard plastic. The connecting base has a fixed end and a connecting end, wherein the fixed end is connected with the handle base, and the connecting end is provided with a clamping protrusion for connecting with the outer sheath. BRIEF DESCRIPTION OF DRAWINGS

[0057] Fig. 1 is a schematic view of the ferrule assembly and the sleeve in cooperation;

[0058] Fig. 2 is a schematic view of the ferrule assembly when it is expanded;

[0059] Fig. 3 is a schematic view of the ferrule assembly when it is closed;

[0060] Fig. 4 is a schematic diagram of a bipolar high-frequency electric snare structure;

[0061] Fig. 5 is an enlarged schematic diagram of A in Fig. 4;

[0062] Fig. 6 is a schematic diagram of current flow when lesion tissue is cut;

[0063] Fig. 7 is an enlarged schematic diagram of C in Fig. 4;

[0064] Fig. 8 is an assembly schematic diagram of the conductive assembly and the sliding member;

[0065] Fig. 9 is a schematic diagram of the conductive assembly structure;

[0066] Fig. 10 is a schematic diagram of the conductive insert;

[0067] Fig. 11 is an enlarged schematic diagram of B in Fig. 4;

[0068] Fig. 12 is a schematic diagram of the connecting member.

[0069] Reference signs: snare assembly 1, first cutting wire 11, second cutting wire 12, structural member 13, insulating tube 14, exposed section 15, sleeve 2, sheath 3, sheath sleeve 31, handle assembly 4, handle base 41, gripping ring 42, limiting block 43, sliding groove 44, sliding member 5, sliding base 51, conductive assembly 6, conductive base 61, conductive insert 62, notch 63, pin 64, third fitting member 65, fourth fitting member 66, base 7, base hole 71, coil spring 72, catheter 73, base groove 74, connecting member 8, connecting base 81, fixed end 82, connecting end 83, clamping protrusion 84. Embodiment of the present application

[0070] The technical solutions of the present application will be further described in detail below in combination with specific embodiments and drawings:

[0071] Embodiment 1:

[0072] As shown in Figs. 1-12, a bipolar high-frequency electric snare includes a snare assembly 1 and a sleeve 2, the sleeve 2 is used to fix the snare assembly 1, and the sleeve 2 is one or more.

[0073] The snare assembly 1 includes a first cutting wire 11 and a second cutting wire 12 that are not in contact with each other, the free ends of the first cutting wire 11 and the second cutting wire 12 are connected through a structural member 13, the first cutting wire 11 is coated with an insulating tube 14 along the extension direction thereof, and the first cutting wire 11 has an exposed section 15.

[0074] The first cutting wire 11 and the second cutting wire 12 in the structural member 13 have a non-contact spacing distance, and the first cutting wire 11 has an exposed section 15 that is not wrapped with the insulating tube 14 on the side of the structural member 13.

[0075] The snare is generally used for cutting polyps or lesion tissues. In the prior art, a monopolar snare is generally used to cut polyps or lesion tissues. In the use of the monopolar snare, a negative plate needs to be attached to the patient's body during the operation, which is not only cumbersome to operate, but also may cause skin burns due to overheating if the negative plate is not firmly attached or falls off, thereby increasing the risk of the patient or causing a short circuit to cause the instrument to fail. The bipolar snare of the present application is used, that is, the first cutting wire 11 and the second cutting wire 12 are connected to two electrodes respectively. In the process of snaring the polyps or lesion tissues, the first cutting wire 11 and the second cutting wire 12 are simultaneously in contact with the human tissues. In other words, the current flows in the direction of the first cutting wire 11, the tissue, and the second cutting wire 12 or in the opposite direction at this time. When the lesion tissue is removed, a current loop is formed, and the instrument short circuit is avoided. The use of the bipolar snare can reduce the damage to the intestinal wall serosa and reduce the possibility of complications such as bleeding and perforation. The modular design is adopted, which has the characteristics of easy maintenance, disassembly, assembly, and parameter adjustment.

[0076] The first cutting wire 11 and the second cutting wire 12 have free ends in the extension direction of the outer sheath tube 3, and the free ends of the first cutting wire 11 and the second cutting wire 12 are non-contact connected through the structural member 13. It should be noted that the structural member 13 is made of insulating material to prevent the first cutting wire 11 and the second cutting wire 12 from short circuiting. The first cutting wire 11 and the second cutting wire 12 form a snare between the sleeve 2 and the structural member 13. The shape of the snare can be oval, polygonal, or circular. In this embodiment, the snare is illustrated in the form of an oval.

[0077] Further, the end of the structural member 13 away from the first cutting wire 11 and the second cutting wire 12 is arc-shaped. When the outer sheath tube 3 enters the human body through the endoscope forceps channel, the snare assembly 1 should be in a closed state at this time. At this time, the snare assembly 1 is accommodated in the outer sheath tube 3 as a whole, but the structural member 13 plays a limiting role, that is, the limiting position is outside the end of the outer sheath tube 3. By setting the end of the structural member 13 away from the first cutting wire 11 and the second cutting wire 12 as arc-shaped, it is beneficial to realize the smoothness of the outer sheath tube 3 entering the human body.

[0078] Further, the current passing through the first cutting wire 11 and the second cutting wire 12 is alternating current. Preferably, the current passing through the first cutting wire 11 and the second cutting wire 12 is high-frequency alternating current. The high-frequency alternating current is used to achieve cauterization of the lesion tissue and hemostasis of the wound.

[0079] Further, the first cutting wire 11 and the second cutting wire 12 are made of metal material. Further, the first cutting wire 11 and the second cutting wire 12 are made of conductive metal material.

[0080] The first cutting wire 11 and the second cutting wire 12 are fixed by the sleeve 2. The sleeve 2 has not less than one sleeve hole. When the sleeve 2 has one sleeve hole, the first cutting wire 11 and the second cutting wire 12 pass through the sleeve hole, and the fixing of the first cutting wire 11 and the second cutting wire 12 is realized by heat shrinkage or adhesion. When the sleeve 2 has two sleeve holes, the first cutting wire 11 and the second cutting wire 12 pass through the corresponding sleeve holes respectively, and the fixing of the first cutting wire 11 and the second cutting wire 12 is realized by heat shrinkage or adhesion. When the sleeve 2 has more than two sleeve holes, the first cutting wire 11 and the second cutting wire 12 pass through the symmetrically arranged sleeve holes. It needs to be explained that the first cutting wire 11 and the second cutting wire 12 can pass through the same sleeve hole, and the fixing of the first cutting wire 11 and the second cutting wire 12 is realized by heat shrinkage or adhesion. The unused sleeve hole can realize the air pressure balance inside and outside the sheath tube 3, improve the smoothness of the movement of the sleeve assembly 1, improve the unfolding and closing degree of the sleeve assembly 1, and further improve the operation accuracy of the bipolar high-frequency loop snare.

[0081] It needs to be explained that the sleeve 2 is arranged along the sheath tube 3, and when the sleeve assembly 1 is unfolded and closed, the sleeve 2 moves along the extension direction of the sheath tube 3. Among them, the sheath tube 3 can be made of flexible material, that is, when the sheath tube 3 enters the human body through the endoscope forceps channel, due to the physiological bending of the human body, the sheath tube 3 is passively bent. The prior art usually uses a double-lumen tube to realize the reciprocating movement of the first cutting wire 11 and the second cutting wire 12, but due to the bending, the strokes of the first cutting wire 11 and the second cutting wire 12 are inconsistent, which further causes that the sleeve assembly 1 cannot completely cut the lesion tissue during the unfolding and closing process. More specifically, when the closed sleeve assembly cuts the lesion tissue, the shortened cutting wire will enter the sheath tube 3 first, and the lengthened cutting wire will not be completely retracted into the sheath tube 3, which further causes that the lesion tissue cannot be completely cut, resulting in the failure of the instrument. Compared with the prior art, the sleeve 2 is arranged to realize that the first cutting wire 11 and the second cutting wire 12 on both sides are synchronized in the extension and retraction of the sheath tube 3 even in the case of bending of the sheath tube 3, which further ensures that the lesion tissue can be completely cut.

[0082] Further, the sleeve is made of insulating material.

[0083] The sleeve 2 is one or more. The arrangement of the sleeve 2 can further improve the smoothness of the movement of the sleeve in the sheath tube in the bent state. The sleeve 2 can also protect the first cutting wire and the second cutting wire, preventing the first cutting wire and the second cutting wire from being bent at too large an angle to cause bending, breaking or failure.

[0084] Since the first wire 11 is coated with the insulation tube 14 along the extension direction thereof. The insulation tube 14 can prevent the first wire 11 and the second wire 12 from needing to be additionally separated by an insulation pad or an insulation tube 14 when the sleeve 2 is fixed, which is conducive to reducing the inner diameter of the sleeve 2, can realize the overall diameter and volume of the sleeve 2 to be reduced, is conducive to adapting to different sheath tubes 3, and thus can cope with more surgical environments.

[0085] Wherein the insulation tube 14 is coated on the first wire 11 and cannot be moved during normal operation. It can be ensured that the insulation tube 14 cannot freely move along the length direction of the first wire 11 during the surgical operation, so as to cause the first wire 11 and the second wire 12 to be short-circuited. Moreover, the fixation of the insulation tube 14 can also realize that the length of the exposed section 15 on the first wire 11 is unchanged without human intervention, which can improve the cutting precision.

[0086] It should be noted that the part of the insulation tube 14 in contact with the tissue cannot cause damage to the tissue and cannot cut the diseased tissue.

[0087] The first wire 11 has an exposed section 15 without the insulation tube 14, and the cutting of the tissue by the first wire 11 and the second wire 12 can only be performed by the second wire 12 and the exposed section 15 of the first wire 11. In this way, the effective cutting length of the first wire 11 can be reduced, and thus the energy can be more concentrated, and the cutting efficiency and cutting effect are improved.

[0088] Moreover, it should be noted that the exposed section 15 is arranged on one side of the structural member 13, and when the sleeve assembly 1 is expanded and closed in the sheath tube 3 by the sliding member 5, the exposed section 15 of the first wire 11 and the second wire 12 can cut the polyp or the diseased component.

[0089] Furthermore, the length of the exposed section 15 is not less than 6 mm. It should be noted that due to the needs of different surgical environments, the length of the exposed section 15 can be adjusted or replaced by human intervention, so as to adjust or replace the sleeve assembly 1 to meet the needs of the snare for different surgical environments, reduce the cost and improve the efficiency.

[0090] Further comprising a sheath tube 3 and a handle assembly 4, the sheath tube 3 is connected with the handle assembly 4, the sleeve assembly 1 is accommodated in the sheath tube 3, and the handle assembly 4 comprises a handle base 41, the handle base 41 is sleeved with a sliding member 5 which can move along a first direction, and the other ends of the first wire 11 and the second wire 12 are connected with the sliding member 5, and the sliding member 5 is used to drive the sleeve assembly 1 to expand and close in the sheath tube 3.

[0091] The outer sheath 3 is used to accommodate the loop assembly 1, and the loop assembly 1 is driven by the sliding member 5 to expand and close in the outer sheath 3, so that the expansion and closure of the loop assembly can be controlled by manually operating the sliding member 5. The sliding member 5 can move along the first direction on the handle base 41, and the first direction includes but is not limited to the length direction of the handle assembly 4 or the extension direction based on the length direction of the handle assembly 4.

[0092] It should be noted that the sliding member 5 provides energy for the first cutting wire 11 and the second cutting wire 12. More specifically, the sliding member 5 provides high-frequency alternating current for the first cutting wire 11 and the second cutting wire 12 to achieve normal cutting of the first cutting wire 11 and the second cutting wire 12.

[0093] Further, the handle base 41 is provided with a first matching member matched with the first direction, and the sliding member 5 is provided with a second matching member, and the first matching member and the second matching member can realize the sliding of the sliding member 5 along the first direction. The first matching member includes but is not limited to a guide groove and a guide rod, and the second matching member includes but is not limited to a guide block and a guide port.

[0094] Further, the outer sheath 3 is made of PTFE, and the structure of the outer sheath 3 is a single-lumen tube. The single-lumen outer sheath 3 and the combined double electrode avoid the failure of the instrument caused by the fact that the cutting wire cannot be completely retracted into the outer sheath 3.

[0095] The handle base 41 and the sliding member 5 are each provided with not less than one gripping ring 42.

[0096] The gripping ring 42 is used to realize the operation of the snare by the operator, and further, the gripping ring 42 on the handle base 41 is arranged at the end of the handle base 41 away from the outer sheath 3, and the number of the gripping rings 42 arranged on the handle base 41 is not more than two, and at least one gripping ring 42 is arranged on the sliding member 5, and the gripping ring 42 arranged on the sliding member 5 can be on the side of the sliding member or can surround the sliding member. Further, the gripping ring arranged on the sliding member can be closed or open.

[0097] Further, the inner side wall of the gripping ring 42 can be provided with a flexible ring. The flexible ring can reduce the squeezing feeling of the fingers of the operator during the use of the device, which is beneficial to improve the operation accuracy and prevent fatigue of the operator during long-time operation.

[0098] Further, the inner side wall of the gripping ring 42 has a curved structure. The curved structure can prevent the fixed compression of the fingers from causing the decrease of the accuracy during the operation of the operator moving the gripping ring 42 along the handle base 41, and can improve the holding experience and has the effect of preventing slipping.

[0099] The sliding member 5 comprises a sliding base 51, which is provided with a conductive assembly 6 for supplying power to the ferrule assembly 1.

[0100] The sliding base 51 is provided with a base 7 corresponding to the conductive assembly 6, and the base 7 is provided with a base hole 71 corresponding to the ferrule assembly 1, and a drum spring 72 is arranged in the base hole 71. The base 7 is provided with a base hole 71 corresponding to the first cutting wire 11 and the second cutting wire 12.

[0101] It should be noted that the handle base 41 is provided with a sliding groove 44, which is matched with the base 7. In other words, when the sliding base 51 drives the base 7 to move in the first direction, the base 7 is matched with the sliding groove 44 to realize the movement of the base 7 in the first direction. In this process, the base 7 drives the first cutting wire 11 and the second cutting wire 12 to move in the first direction.

[0102] Further, the base 7 is also provided with a catheter 73, wherein the catheter 73 is connected with the base 7 by mechanical embedding or bonding. The catheter 73 is used to control the first cutting wire 11 and the second cutting wire 12. In other words, the first cutting wire 11 and the second cutting wire 12 are contained in the catheter 73, and the catheter 73 is communicated with the outer sheath 3. It should be noted that when the sliding member 5 moves to the limit distance away from the outer sheath 3, the catheter 73 is still in communication with the outer sheath 3. The arrangement of the catheter 73 can prevent the first cutting wire 11 and the second cutting wire 12 from bending or separating during the movement of the sliding member 5 in the first direction, and can realize the consistency of the movement of the first cutting wire 11 and the second cutting wire 12.

[0103] Further, the catheter 73 is made of rigid material.

[0104] It should be noted that the base 7 and the sliding base 51 can be clamped. The sliding base 51 is provided with a base groove 74 corresponding to the base hole 71. The conductive base 61 is provided with a third matching part 65, and the inner wall of the base groove 74 is provided with a fourth matching part 66. The third matching part 65 and the fourth matching part 66 realize the clamping connection of the conductive base 61 and the base 7, and ensure the power supply of the first cutting wire 11 and the second cutting wire 12 by the conductive base 61, prevent the separation or poor contact of the conductive base 61 and the base 7 during operation, and further cause the failure of the operation or the harm to the patient. More specifically, the third matching part 65 is a clamping block, and the fourth matching part 66 is a matching groove, that is, the clamping block is fixed by buckling with the matching groove.

[0105] The first cutting wire 11 and the second cutting wire 12 are respectively provided with base holes 71, and the conductive assembly 6 is arranged correspondingly with the base holes 71, that is, to ensure that the conductive assembly 6 supplies power to the first cutting wire 11 and the second cutting wire 12. More specifically, the first cutting wire 11 and the second cutting wire 12 are embedded in the base holes 71 of the base 7 at one end away from the structural member 13, and are respectively connected with the drum springs 72, and the two drum springs 72 are arranged in cooperation with the pins 64, and the power supply to the first cutting wire 11 and the second cutting wire 12 is realized through the pins 64 of the conductive assembly 6.

[0106] Among them, the drum spring 72 is embedded into the corresponding base hole 71.

[0107] Further, the drum spring 72 has a horn-shaped structure on both sides. The drum spring 72 is conducive to firm cooperation with the pin 64, that is, to improve the stability of the pin 64 in supplying power to the first cutting wire 11 and the second cutting wire 12; and the setting direction of the drum spring 72 is perpendicular to the first moving direction, which can realize the perpendicularity of the pin 64 and the drum spring 72 through the buffering effect of the drum spring 72 during the movement of the base 7, thereby maintaining the state of the conductive assembly 6 and reducing the risk of falling of the conductive assembly 6.

[0108] The conductive assembly 6 comprises a conductive base 61, and the conductive base 61 is provided with symmetrically arranged conductive tabs 62, and the conductive tabs 62 are provided with notches 63 on the side facing the sliding base 51, and the notches 63 are provided with pins 64 protruding from the conductive base 61.

[0109] The conductive assembly 6 is used to connect with an external high-frequency generator, and transmit the current of the external high-frequency generator to the first cutting wire 11 or the second cutting wire 12. The corresponding arrangement of the pin 64 and the notch 63 realizes that the pin 64 can more flexibly cooperate with the conductive tab 62. It should be noted that the arrangement of the notch 63 realizes the contact connection between the pin 64 and the conductive tab 62. It should be noted that the pin 64 is arranged in cooperation with the drum spring 72. It should be noted that the conductive assembly 6 is connected with the external high-frequency generator through the conductive tab 62, that is, the conductive tab 62 has an exposed section, and the connection with the external high-frequency generator is realized through the exposed section.

[0110] It should be noted that since high-frequency alternating current is used, the cooperation between each pin 64 and each drum spring 72 can be exchanged, in other words, the cooperation between the conductive assembly 6 and the base 7 has no positive and negative distinction, which is conducive to the convenience degree of assembly between the conductive assembly 6 and the base 7.

[0111] Further, the pin 64 can be replaced. The modular design of the conductive assembly 6 can be realized, and the pin 64 can be replaced or produced according to the size of different base holes 71, which can save cost and improve the simplicity of replacement.

[0112] Further, the notch 63 is provided with a buffer section. It should be noted that the buffer section can reduce the possibility of damage and bending of the pin 64 during cooperation with the drum spring 72, that is, when the pin 64 is subjected to a greater impact force in the length direction, the impact can be absorbed through the buffer section while the position of the pin 64 is controlled, so that the length of the pin 64 extending out of the conductive base body 61 is controllable and limited, that is, after the pin 64 is compressed and retracted into the buffer section, it will have a force to return to the original position to realize the length of the pin 64 extending out of the conductive base body 61. It should be noted that the force includes but is not limited to elastic force or pressure.

[0113] Further, the conductive tab 62 is bent. The bent conductive tab 62 can improve the ability of the notch 63 to absorb impact force, and the bent configuration can achieve the ability to adapt to external cold and heat, preventing the conductive tab 62 from being disconnected from the pin 64 or the drum spring 72 of the input end after the external temperature changes. In addition, the precision requirement of the bent conductive tab 62 can be lower than that of the straight conductive tab 62, which is beneficial to the control of production and replacement costs.

[0114] Further, the pin 64 is made of a conductive material.

[0115] More specifically, the pin 64 is made of a metal conductive material. Since the device will inevitably perform the disconnection and connection of the pin 64 and the conductive base body 61 with the corresponding receiving device during use, the selection of the material of the pin 64 will affect the service life of the pin 64 and the overall device. The use of a metal material can improve the service life of the pin 64 and reduce the possibility of bending or breaking of the pin 64.

[0116] When the lesion tissue is cut, the high-frequency current passes through the electrode plug, the conductive tab 62, the pin 64, the drum spring 72, the first cutting wire 11, the lesion tissue, the second cutting wire 12, the drum spring 72, the pin 64, the conductive tab 62, and the electrode plug in turn, and finally returns to the high-frequency generator. The high-frequency current passes through the lesion tissue to complete the cutting of the lesion tissue by using the heat effect of the high-frequency current.

[0117] The handle base body 41 is provided with at least one limiting block 43, which is used to limit the limit position of the sliding member 5.

[0118] Through the limiting block 43, the limit distance of the sliding member 5 in the first direction can be controlled, which is beneficial to the control of the distance by the operator and prevents the position of the ferrule assembly 1 from being excessively adjusted by the operator due to tension or mistake during operation of the sliding member 5.

[0119] Further, the position of the limiting block 43 is adjustable, that is, the size of the expansion of the ferrule assembly 1 can be controlled in different surgical environments.

[0120] The outer sheath tube 3 is sleeved with a protective sleeve 31 along its extending direction, and the protective sleeve 31 is cooperatively connected with the handle base 41.

[0121] The protective sleeve 31 is used for protecting the outer sheath tube 3. The protective sleeve 31 and the handle base 41 can be connected in a manner such as but not limited to clamping or threaded connection to fix the protective sleeve 31.

[0122] It should be noted that the handle base 41 is provided with a connecting piece 8 on the side facing the sleeve assembly 1, and the connecting piece 8 is used for connecting and fixing the outer sheath tube 3. The connecting piece 8 comprises a connecting base 81. The connecting base 81 is made of metal or hard plastic. The connecting base 81 has a fixed end 82 and a connecting end 83. The fixed end 82 is connected with the handle base 41, and the connecting end 83 is provided with a clamping protrusion 84 on the side, and the clamping protrusion 84 is used for connecting with the outer sheath tube 3.

[0123] The above embodiments have described the technical solutions of the present application in detail. It should be understood that the above description is only a specific embodiment of the present application, and is not used to limit the present application. Any modification, supplement or similar replacement within the principle range of the present application should be included in the protection scope of the present application.

Claims

1. A bipolar high-frequency snare comprising a loop assembly (1) and a sleeve (2) for fixing the loop assembly (1), characterized in that, The sleeve (2) is one or more; The sleeve assembly (1) comprises a first cutting wire (11) and a second cutting wire (12) which are not in contact with each other, free ends of the first cutting wire (11) and the second cutting wire (12) are connected by a structure (13), the first cutting wire (11) is coated with an insulation tube (14) extending along the direction of the first cutting wire (11), the first cutting wire (11) has an exposed section (15); The first cutting wire (11) and the second cutting wire (12) have a non-contact spacing distance in the structure (13), the first cutting wire (11) has an exposed section (15) without the insulation tube (14) on the side of the structure (13); The bipolar high-frequency loop snare further comprises an outer sheath (3) and a handle assembly (4), the outer sheath (3) is connected with the handle assembly (4), the sleeve assembly (1) is accommodated in the outer sheath (3), and the handle assembly (4) comprises a handle base body (41), the handle base body (41) is sleeved with a slider (5) which can move in a first direction, and the slider (5) is used to drive the sleeve assembly (1) to expand and close in the outer sheath (3); The slider (5) comprises a sliding base body (51), the sliding base body (51) is provided with a conductive assembly (6) which can be matched, and the conductive assembly (6) is used to supply power to the sleeve assembly (1); The sliding base body (51) is provided with a base (7) which is correspondingly arranged with the conductive assembly (6), the base (7) is provided with a base hole (71) which is correspondingly arranged with the first cutting wire (11) and the second cutting wire (12), and a drum spring (72) is arranged in the base hole (71); A sliding groove (44) is arranged in the handle base body (41), the sliding groove (44) is matched with the base (7), and the base (7) can drive the first cutting wire (11) and the second cutting wire (12) to move in the first direction; The base (7) is clamped with the sliding base body (51), the sliding base body (51) is provided with a base groove (74) which is correspondingly arranged with the base hole (71), a third matching part (65) is arranged on the side of the conductive base body (61), a fourth matching part (66) is arranged on the inner wall of the base groove (74), and the conductive base body (61) and the base (7) are matched and connected through the third matching part (65) and the fourth matching part (66); The conductive assembly (6) comprises a conductive base body (61), the conductive base body (61) is provided with symmetrically arranged conductive inserts (62), the conductive inserts (62) are provided with notches (63) on the side facing the sliding base body (51), and the notches (63) are matched with the inserted pins (64) which are arranged on the conductive base body (61); The first cutting wire (11) and the second cutting wire (12) are embedded in the base hole (71) of the base (7) at the end away from the structure (13) and are connected with the drum springs (72) respectively, the two drum springs (72) are matched with the inserted pins (64), and the inserted pins (64) of the conductive assembly (6) are used to supply power to the first cutting wire (11) and the second cutting wire (12); The inserted pins (64) can be replaced.

2. The bipolar high-frequency snare according to claim 1, wherein The handle base body (41) and the slider (5) are each provided with not less than one gripping ring (42).

3. The bipolar high-frequency snare according to claim 1, wherein The handle base (41) is provided with at least one limiting block (43) for limiting the limit position of the sliding member (5).

4. The bipolar high-frequency snare according to claim 1, wherein The outer sheath (3) is sleeved with a protective sleeve (31) along its extension direction, and the protective sleeve (31) is cooperatively connected with the handle base (41).

Images