CN117958955A - Medical snare cutting knife - Google Patents

Abstract

The invention provides a medical snare cutting knife, which comprises a knife head assembly, a catheter assembly, a control wire assembly and a handle assembly; the tool bit assembly comprises a snare loop and a cutting knife, the proximal end of the snare loop is connected with the distal end of the catheter assembly, and the catheter assembly comprises an outer sheath tube and a mandrel movably penetrating through the outer sheath tube; the handle assembly comprises a handle seat and an operating handle used for driving the mandrel to move, the proximal end of the mandrel is fixedly connected with the operating handle, the proximal end of the outer sheath tube is fixedly connected with the handle seat, the wire control assembly comprises at least one wire and a wire control seat, the distal end of the wire is fixedly connected with the inner side of the outer sheath tube, the wire control seat is fixedly connected with the handle assembly in a sleeved mode, and the proximal end of the wire movably penetrates through the wire control seat to enable the cutter to rotate or lock. The medical snare cutting knife can adjust deflection of the knife head direction, is convenient for the knife head to reach the focus position, is simple to operate and convenient to realize, and reduces the operation difficulty.

Description

Medical snare cutting knife

Technical Field

The invention relates to the field of medical instruments, in particular to a medical snare cutting knife which is used for cutting or stripping digestive tract polyps, respiratory tract polyps or tumor mucous membranes.

Background

The endoscopic submucosal dissection (Endoscopic submucosal dissection, ESD) is a new treatment means which appears in recent years, is also a technology with good clinical application prospect, can completely resect more early digestive tract cancers at one time under the endoscope, and avoids the pain of the open surgery and the resection of organs. Compared with the prior endoscopic treatment methods such as the laparotomy, EMR (Endoscopic Mucosal Resec-section, endoscopic mucosal resection) and the like, the method has the advantages that the wound is small, a patient can receive multiple treatments of multiple parts, a doctor can obtain a complete tissue pathological specimen for analysis, the resection rate of more than 96 percent is carried out on tumors with larger area and irregular morphology or combined ulcers and scars, the recurrence probability is reduced, and the like.

At present, the conventional electrotome can only adjust the direction of the tool bit through the endoscope, and certain parts of the human body are special due to the limitation of the human body structure, the direction of the endoscope is difficult to adjust at the special parts, the tool bit is difficult to reach the focus position, and the operation difficulty is high.

Disclosure of Invention

In view of the shortcomings of the prior art, the invention aims to provide a medical snare cutting knife, which can adjust deflection of a knife head direction, is convenient for the knife head to reach a focus position, is simple to operate and convenient to realize, and reduces operation difficulty.

In order to achieve the above purpose, the invention provides a medical snare cutting knife, which comprises a knife head assembly, a catheter assembly, a control line assembly and a handle assembly; the tool bit assembly comprises a snare loop and a cutting knife, the proximal end of the snare loop is connected with the distal end of the catheter assembly, and the catheter assembly comprises an outer sheath tube and a mandrel movably penetrating through the outer sheath tube; the handle assembly comprises a handle seat and an operating handle used for driving the mandrel to move, the proximal end of the mandrel is fixedly connected with the operating handle, the proximal end of the outer sheath tube is fixedly connected with the handle seat, the wire control assembly comprises at least one wire and a wire control seat, the distal end of the wire is fixedly connected with the inner side of the outer sheath tube, the wire control seat is fixedly connected with the handle assembly in a sleeved mode, and the proximal end of the wire movably penetrates through the wire control seat to enable the cutter to rotate or lock.

Further, the control line seat comprises a fixed seat and at least one support device, wherein the fixed seat is sleeved and fixed on the handle assembly, and the support device is connected with the fixed seat; the support device comprises a support, a button and a spring, wherein the spring is arranged in the support, and one end of the spring abuts against the fixing seat; the support is provided with a third side hole, the button passes through the third side hole to be abutted or connected with the other end of the spring, and the button passes through the third side hole to be movably connected with the support; the button is provided with a first through hole, the support is further provided with a second through hole communicated with the first through hole, and the proximal end of the wire is movably and sequentially penetrated through the second through hole and the first through hole.

Further, the support is further provided with a protrusion, and the protrusion is in or out of contact with the button.

Further, pressing the button in the direction of the holder brings the inner side of the boss into abutment therewith to fix the wire to the first through hole or the second through hole.

Further, the outer side of the protrusion is shifted to a direction away from the support, so that the first through hole and the second through hole are communicated.

Further, the wire comprises a connecting end, a wire body and a pull ring, wherein the distal end of the wire body is connected with the connecting end, at least one first side hole is formed in the distal end of the outer sheath tube, the outer diameter of the connecting end is larger than that of the first side hole, the wire body penetrates through the first side hole to enable the connecting end to be reserved in the outer sheath tube, the proximal end of the wire body movably penetrates through the second through hole and the first through hole in sequence, and the proximal end of the wire body is connected with the pull ring.

Further, the control line assembly further comprises a fixing ring, the fixing ring is sleeved with the outer sheath tube in a fixed connection mode, the fixing ring is provided with at least one third through hole, and the proximal end of the line body sequentially penetrates through the third through hole, the second through hole and the first through hole to be connected with the pull ring.

Further, the sheath tube is further provided with at least one second side hole, and the proximal end of the wire body sequentially penetrates through the second side hole, the second through hole and the first through hole to be connected with the pull ring.

Further, the number of the wires is four, and the distal end of each wire is fixedly connected in the outer sheath tube respectively; the wire control seat comprises four support devices, and the proximal end of each wire is correspondingly provided with a second through hole and a first through hole of the corresponding support device in a penetrating mode.

Further, the colors of the four wires are different from each other.

The medical snare cutting knife can adjust deflection of the knife head direction, is convenient for the knife head to reach the focus position, is simple to operate and convenient to realize, and reduces the operation difficulty.

Drawings

FIG. 1 is a schematic view of the medical snare cutting blade according to the present application;

FIG. 2 is a schematic diagram of a cable seat according to the present application;

FIG. 3 is a schematic view of another angle of the cable seat of the present application;

FIG. 4 is a schematic diagram of a wire structure according to the present application;

FIG. 5 is a cross-sectional view of the connection of the button and the control wire holder of the present application;

FIG. 6 is a schematic diagram of a control wire seat;

FIG. 7is a state diagram of one connection of the distal ends of the wires according to the present application;

FIG. 8 is a state diagram of another connection of the distal ends of the wires according to the present application;

fig. 9 is a state view of the medical snare cutting blade according to the present application.

Description of element numbers:

1. Tool bit assembly, 11, snare loop, 12, cutter, 2, catheter assembly, 21, sheath tube, 211, first side opening, 212, second side opening, 22, mandrel, 3, wire control assembly, 31, wire, 32, wire control seat, 33, securing ring, 321, anchor seat, 322, seat means, 331, third through hole, 3221, seat, 3222, button, 3223, spring, 32221, first through hole, 32212, protrusion, 32213, third side opening, 32211, second through hole, 311, connection end, 312, wire body, 313, tab, 4, handle assembly, 41, handle seat, 42.

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used herein for descriptive purposes only and not for purposes of limitation, and are intended to limit the scope of the invention as defined by the claims and the relative terms thereof as construed as corresponding to the claims.

The application provides a medical instrument, in particular to a medical snare cutting knife for cutting or stripping digestive tract polyps, respiratory tract polyps or tumor mucous membranes. For purposes of more clarity in describing the structure of the present application, the following examples will use "distal" and "proximal" as the azimuthal terms, "distal" indicating the end of the instrument that is distal to the operator during the procedure, and "proximal" indicating the end of the instrument that is proximal to the operator during the procedure.

As shown in fig. 1, the medical snare cutting knife comprises a knife head assembly 1, a catheter assembly 2, a control wire assembly 3 and a handle assembly 4; the tool bit assembly 1 comprises a snare loop 11 and a cutting knife 12, the proximal end of the snare loop 11 is connected with the distal end of the catheter assembly 2, and the catheter assembly 2 comprises an outer sheath 21 and a mandrel 22 movably penetrating the outer sheath 21; the handle assembly 4 comprises a handle seat 41 and an operating handle 42 for driving the mandrel 22 to move, the proximal end of the mandrel 22 is fixedly connected with the operating handle 42, the proximal end of the sheath tube 21 is fixedly connected with the handle seat 41, the wire control assembly 3 comprises at least one wire 31 and a wire control seat 32, the distal end of the wire 31 is fixedly connected with the sheath tube 21, the wire control seat 32 is sheathed and fixed with the handle assembly 4, and the proximal end 31 of the wire movably penetrates through the wire control seat 32 to enable the cutting knife 12 to rotate or lock. According to the scheme of the application, the hollow outer sheath tube 21, the mandrel 22 movably penetrating through the outer sheath tube 21 and the handle assembly 4 for driving the mandrel 22 to move are arranged, and the proximal end of the snare loop 11 in the cutter head assembly 1 is fixedly connected with the distal end of the mandrel 22. When the handle assembly 4 drives the mandrel 22 to move back and forth in the outer sheath 21, the mandrel 22 drives the tool bit assembly 1 to move back and forth together, thereby realizing that the snare loop 11 and the cutter 12 extend from the outer sheath 21 and that the snare loop 11 and the cutter 12 are retracted in the outer sheath 21. The distal end of the lead 31 is fixedly connected with the inside of the outer sheath tube 21, the proximal end of the lead 31 is movably arranged in the wire control seat 32 in a penetrating way, and the bending of the outer pin tube 21 is realized by pulling the lead 31 towards the proximal end, so that the cutter head component 1 is driven to deflect in the direction and keep motionless; when the medical snare cutting knife enters a human body through the endoscope, and when the endoscope cannot adjust the proper direction to enable the knife head to reach the focus position, the direction deflection of the knife head is adjusted according to the needs by pulling the lead 31 to the near end, so that the knife head can conveniently reach the focus position, the operation is simple, the realization is convenient, and the operation difficulty is reduced.

As shown in fig. 2-7 and 9, in particular, the control wire holder 32 comprises a fixing base 321 for sleeving and fixing the handle assembly 4 and at least one support device 322, and the support device 322 is connected with the fixing base 321; the support device 322 comprises a support 3221, a button 3222 and a spring 3223, wherein the spring 3223 is arranged in the support 3221, and one end of the spring 3223 abuts against the fixed seat 321; the support 3221 is provided with a third side hole 32213, the button 3222 is abutted or connected with the other end of the spring 3223 through the third side hole 32213, and the button 3222 is movably connected with the support 3221 through the third side hole 32213; the button 3222 is provided with a first through hole 32221, the support 3221 is further provided with a second through hole 32211 communicated with the first through hole 32221, and the proximal end of the wire 31 is movably penetrated through the second through hole 32211 and the first through hole 32221 in sequence. The support 3221 is further provided with a protrusion 32212, the protrusion 32212 being in abutment or not with the button 3222. Pressing the button 3222 in the direction of the support 3221 brings the inner side of the protrusion 32212 into abutment therewith to fix the wire 31 to the first through hole 32221 or the second through hole 32211. Toggling the outer side of the protrusion 32212 in a direction away from the support 3221 causes the first through hole 32221 and the second through hole 32211 to communicate.

As shown in fig. 2 to 7, more specifically, the lead 31 includes a connection end 311, a wire body 312, and a pull ring 313, wherein a distal end of the wire body 312 is connected to the connection end 311, the distal end of the sheath tube 21 is provided with at least one first side hole 211, an outer diameter of the connection end 311 is larger than that of the first side hole 211, the wire body 312 passes through the first side hole 211 to leave the connection end 311 in the sheath tube 21, a proximal end of the wire body 312 movably passes through the second through hole 32211 and the first through hole 32221 in sequence, and a proximal end of the wire body 312 is connected to the pull ring 313. Further preferably, the distal end of the outer sheath 21 is provided with four first side holes 211, the outer diameter of each connecting end 311 is larger than that of each first side hole 211, each wire body 312 passes through the corresponding first side hole 211 to leave each connecting end 311 in the outer sheath 21, the proximal end of each wire body 312 movably passes through the corresponding second through hole 32211 and the corresponding first through hole 32221 in sequence, and the proximal end of each wire body 312 is connected with the corresponding pull ring 313. The control line assembly 3 further comprises a fixed ring 33, the fixed ring 33 is sleeved with the outer sheath tube 21 in a fixed connection mode, the fixed ring 33 is provided with at least one third through hole 331, and the proximal end 312 of the line body sequentially penetrates through the third through hole 331, the second through hole 32211 and the first through hole 32221 to be connected with the pull ring 313. More specifically, the number of the wires 31 is four, and the distal end of each wire 31 is fixedly connected in the outer sheath 21, that is, the distal end of each wire 31 is fixed in the corresponding first side hole 211; the wire control seat 32 comprises four support devices 322, each support device 322 has the same structure, each support device 322 comprises a support 3221, a button 3222 and springs 3223, the four supports 3221 are respectively connected with the periphery of the fixed seat 321, each spring 3223 is arranged in the corresponding support 3221, and one end of each spring 3223 respectively abuts against the outer side of the fixed seat 321; each support 3221 is provided with a third side hole 32213, each button 3222 is abutted or connected with the other end of the corresponding spring 3223 through the corresponding third side hole 32213, and each button 3222 is movably connected with the corresponding support 3221 through the corresponding third side hole 32213; each button 3222 is provided with a first through hole 32221, and each support 3221 is further provided with a second through hole 32211 in communication with the corresponding first through hole 32221; the proximal end of each wire 31 is respectively and movably threaded through the second through hole 32211 and the first through hole 32221, so as to realize the drawing or fixing of each wire 31. Each support 3221 is further provided with a protrusion 32212, each protrusion 32212 being in or out of abutment with a corresponding button 3222. Pressing the button 3222 in the direction of the corresponding mount 3221 brings the inner side of the corresponding protrusion 32212 into abutment therewith to fix the corresponding wire 31 to the corresponding first through hole 32221 or second through hole 32211. Further preferably, the fixing ring 33 is provided with four third through holes 331, and the proximal end of each wire body 312 is connected to the corresponding pull ring 313 through the corresponding third through holes 331, second through holes 32211, and first through holes 32221 in sequence. The four wires 31 are arranged, so that the direction adjustment of the cutting knife 12 is more convenient, and the four wires can be selectively adjusted according to the requirement. Further, the colors of the four wires 31 are different from each other, so that when the medical electric knife is operated by a human body and the direction of the cutting knife 12 needs to be adjusted, the user can easily identify which wire 31 needs to rotate in which direction, and the operation is convenient.

As shown in fig. 2-7 and fig. 9, when the cutter 12 is required to be adjusted to turn, the corresponding pull ring 313 is pulled to drive the wire body 312 to move, the wire connecting end 311 is fixed with the distal end of the catheter assembly 2, the distal end of the catheter assembly 2 is bent towards the pulling force under the pulling force, and the cutter head assembly 1 realizes the adjustment of the direction. When the button 3222 is lifted, the first through hole 32221 of the button 3222 is communicated with the second through hole 32211 of the support 3221, and the protrusion 32212 is not abutted against the button 3222, so that the wire body 312 can be pulled normally, and the rotation direction of the cutting knife 12 can be adjusted. When the button 3222 is pressed toward the support 3221, the inner side of the protrusion 32212 abuts against the bottom of the button 3222, and the button 3222 is fixed, and at this time, the first through hole 32221 of the button 3222 and the second through hole 32211 of the support 3221 are displaced, and the wire body 312 is fixed, that is, the wire 31 is fixed in the first through hole 32221 or the second through hole 32211, and the direction of the cutter 12 is also fixed at this time. When the outer side of the protrusion 32212 is shifted in a direction away from the support 3221, the inner side of the protrusion 32212 is not abutted against the bottom of the button 3222, and then the button 3222 is lifted in a direction away from the support 3221 under the action of the spring 3223, at this time, the first through hole 32221 and the second through hole 32211 are communicated, and then the wire body 312 can be pulled normally.

As shown in fig. 8 and 9, in another embodiment of the medical snare cutting knife, other structures are kept unchanged on the basis of the above embodiment, the fixing ring 33 is not provided, but at least one second side hole 212 is further provided on the outer sheath 21, and the proximal end 312 of the wire body sequentially passes through the second side hole 212, the second through hole 32211 and the first through hole 32221 and is connected with the pull ring 313, thereby realizing the fixed connection of the guide wire 31. Further preferably, the outer sheath 21 is provided with four second side holes 212, and the proximal end 312 of each wire body is connected to the corresponding pull ring 313 through the corresponding second side hole 212, the second through hole 32211, and the first through hole 32221 in sequence.

In summary, in the use process of the medical snare cutting knife, the doctor needs to push the operation handle 42 to slide back and forth on the handle seat 41 to control the positions of the snare loop 11 and the cutting knife 12, and then select the operation to control which wire 31 is pulled proximally according to the needs, so that the cutting knife 12 can rotate in the direction to conveniently reach the position of the lesion tissue, and then the operations of excision scope marking, injection bulge, mucous membrane incision and peeling, and hemostasis function are performed. Therefore, the medical snare incision knife has simple structure and safe and convenient operation, and can shorten the operation time and reduce the operation difficulty. Therefore, the invention effectively overcomes the defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The medical snare cutting knife is characterized by comprising a knife head assembly (1), a catheter assembly (2), a control wire assembly (3) and a handle assembly (4); the tool bit assembly (1) comprises a snare loop (11) and a cutting knife (12), the proximal end of the snare loop (11) is connected with the distal end of the catheter assembly (2), and the catheter assembly (2) comprises an outer sheath tube (21) and a mandrel (22) movably penetrating through the outer sheath tube (21); the handle assembly (4) comprises a handle seat (41) and an operating handle (42) used for driving the mandrel (22) to move, the proximal end of the mandrel (22) is fixedly connected with the operating handle (42), the proximal end of the outer sheath tube (21) is fixedly connected with the handle seat (41), the wire control assembly (3) comprises at least one wire (31) and a wire control seat (32), the distal end of the wire (31) is fixedly connected with the inner side of the outer sheath tube (21), the wire control seat (32) is sheathed and fixed with the handle assembly (4), and the proximal end (31) of the wire is movably arranged in the wire control seat (32) in a penetrating manner so as to enable the cutting knife (12) to rotate or be locked.

2. A medical snare cutting instrument according to claim 1, wherein the control wire holder (32) comprises a holder (321) for socket-mounting the handle assembly (4) and at least one support means (322), the support means (322) being connected to the holder (321); the support device (322) comprises a support (3221), a button (3222) and a spring (3223), wherein the spring (3223) is arranged in the support (3221), and one end of the spring (3223) abuts against the fixing seat (321); the support (3221) is provided with a third side hole (32213), the button (3222) passes through the third side hole (32213) to be abutted against or connected with the other end of the spring (3223), and the button (3222) passes through the third side hole (32213) to be movably connected with the support (3221); the button (3222) is provided with a first through hole (32221), the support (3221) is further provided with a second through hole (32211) communicated with the first through hole (32221), and the proximal end of the wire (31) is movably and sequentially penetrated through the second through hole (32211) and the first through hole (32221).

3. A medical snare cutting knife according to claim 2, wherein the support (3221) is further provided with a protrusion (32212), the protrusion (32212) being in or out of abutment with the button (3222).

4. A medical snare cutting knife according to claim 3, wherein pressing the button (3222) in the direction of the support (3221) causes the inner side of the protrusion (32212) to abut against it to secure the wire (31) to the first through hole (32221) or the second through hole (32211).

5. A medical snare cutting knife according to claim 3, wherein toggling the outer side of the protrusion (32212) in a direction away from the support (3221) places the first through hole (32221) and the second through hole (32211) in communication.

6. The medical snare cutting knife according to claim 2, wherein the guide wire (31) comprises a connection end (311), a wire body (312) and a pull ring (313), wherein the distal end of the wire body (312) is connected with the connection end (311), the distal end of the sheath tube (21) is provided with at least one first side hole (211), the outer diameter of the connection end (311) is larger than that of the first side hole (211), the wire body (312) passes through the first side hole (211) to leave the connection end (311) in the sheath tube (21), the proximal end of the wire body (312) movably passes through the second through hole (32211) and the first through hole (32221) in sequence, and the proximal end of the wire body (312) is connected with the pull ring (313).

7. A medical snare cutting knife according to claim 6, wherein the control wire assembly (3) further comprises a fixing ring (33), the fixing ring (33) is fixedly sleeved with the outer sheath tube (21), the fixing ring (33) is provided with at least one third through hole (331), and the proximal end (312) of the wire body sequentially passes through the third through hole (331), the second through hole (32211), the first through hole (32221) and the pull ring (313) to be connected.

8. A medical snare cutting knife according to claim 6, wherein the outer sheath (21) is further provided with at least one second side hole (212), the proximal end (312) of the wire body being connected to the pull ring (313) by passing sequentially through the second side hole (212), the second through hole (32211), the first through hole (32221).

9. A medical snare cutting knife according to claim 2, wherein the number of wires (31) is four, the distal end of each wire (31) being fixedly connected within the outer sheath (21), respectively; the wire control seat (32) comprises four support devices (322), and the proximal end of each wire (31) is respectively and correspondingly provided with a second through hole (32211) and the first through hole (32221) of the corresponding support device (322).

10. A medical snare cutting instrument according to claim 9, wherein the four wires (31) are of mutually different colours.