CN219166560U - Snare - Google Patents

Abstract

The utility model discloses a snare, comprising: a sheath; the core wire penetrates through the sheath tube and can reciprocate along the axial direction of the sheath tube; the device comprises a ferrule head, a core wire and a sheath tube, wherein the ferrule head is suitable for ferrules and cutting objects to be cut, the proximal end of the ferrule head is connected with the distal end of the core wire in a traction way and is retracted in the sheath tube, and when the core wire moves back and forth along the axial direction of the sheath tube, the ferrule head expands or contracts; the handle comprises a holding part and a push-pull part which is connected with the holding part in a sliding way, the holding part is connected with the proximal end of the sheath tube, and the proximal end of the core wire extends out of the sheath tube and is connected with the push-pull part. The snare is unnecessary to be electrified, a user can operate the handle and hold the holding part by hand when using the snare, and the core wire can reciprocate in the sheath tube by pushing the push-pull part to the far end or pulling the push-pull part to the near end, so that the ferrule head is driven to open or shrink, the ferrule head can be used for holding the object to be resected after opening, the object to be resected can be gradually tightly held in the shrinking process, the object to be resected is finally cut off, the purpose of resecting is achieved, and the operation is very convenient.

Description

Snare

Technical Field

The utility model relates to the technical field of medical appliances, in particular to a snare for excision operation.

Background

Snare is used to capture and resect tissue during resection procedures, for example, but not limited to, resecting polyps, which are a type of bulge-like lesions protruding from a mucosal surface into a lumen, such as intestinal polyps distributed throughout the colon and rectum, and polypectomy can effectively disrupt adenoma to adenocarcinoma progression, thereby reducing the risk of colorectal cancer progression.

At present, most of polypectomy is performed under an endoscope by high-frequency electrotomy treatment with an electrified snare, but most of adverse reactions of the polypectomy are related to electrocautery, for example, bleeding, particularly delayed bleeding, can be caused by exposure of an artery branch after the branch is subjected to electrocoagulation; meanwhile, the high heat of the electrocoagulation can damage the intrinsic muscle layer to increase the risk of postoperative perforation; the post-polypectomy syndrome is also called transmural burn syndrome, and refers to that after the polyp is subjected to the electro-coagulation excision, abdominal pain, fever, increased white blood cell count and peritonitis occur under the condition of no intestinal perforation, and most of reasons are polyp thermal excision.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the snare which is convenient to operate and can complete cutting without electrifying.

The snare according to an embodiment of the present utility model includes: a sheath; the core wire penetrates through the sheath tube, and can reciprocate along the axial direction of the sheath tube; the device comprises a ferrule head, a core wire, a sheath tube and a cutting head, wherein the ferrule head is suitable for ferrules and cutting objects to be resected, the proximal end of the ferrule head is in traction connection with the distal end of the core wire and is contracted in the sheath tube, and when the core wire moves back and forth along the axial direction of the sheath tube, the ferrule head expands or contracts; the handle comprises a holding part and a push-pull part which is connected with the holding part in a sliding way, the holding part is connected with the proximal end of the sheath tube, and the proximal end of the core wire extends out of the sheath tube and is connected with the push-pull part.

Has at least the following beneficial effects: the snare is unnecessary to be electrified, a user can operate the handle and hold the holding part by hand when using the snare, and the core wire can reciprocate in the sheath tube by pushing the push-pull part to the far end or pulling the push-pull part to the near end, so that the ferrule head is driven to open or shrink, the ferrule head can be used for holding the object to be resected after opening, the object to be resected can be gradually tightly held in the shrinking process, the object to be resected is finally cut off, the purpose of resecting is achieved, and the operation is very convenient.

According to some embodiments of the utility model, the grip comprises: a grip; and the pressing block is detachably connected with the grip, and the proximal end of the sheath tube can be fixed between the grip and the pressing block.

According to some embodiments of the utility model, the handle is of a hollow structure, the interior of the handle can be used for the proximal end of the sheath tube to extend into, the pressing block is of a hollow structure and can be used for the core wire to penetrate through, the pressing block is detachably inserted into the handle, and the pressing block can be used for pressing the proximal end of the sheath tube into the interior of the handle.

According to some embodiments of the utility model, the press block is in threaded connection with the grip, a horn mouth is arranged at the proximal end of the sheath tube, a first round table surface is arranged on the inner surface of the grip, a second round table surface is arranged on the outer surface of the press block, and the horn mouth can be pressed between the first round table surface and the second round table surface.

According to some embodiments of the utility model, the outer surface of the grip is provided with a plurality of anti-slip lines along the circumferential direction.

According to some embodiments of the utility model, the grip further comprises a guide rod, a distal end of which is snap-fitted to a proximal end of the press block, the guide rod being slidably coupled to the push-pull portion.

According to some embodiments of the utility model, a guide groove is formed in the guide rod, and the proximal end of the core wire is arranged in the guide groove in a penetrating mode and connected with the push-pull part.

According to some embodiments of the utility model, a first rivet pipe is riveted to the outer surface of the proximal end of the core wire, a rivet head is provided at the proximal end of the first rivet pipe, the rivet head is riveted to the proximal end of the first rivet pipe and the proximal end of the core wire at the same time, and the rivet head is embedded in the push-pull portion.

According to some embodiments of the utility model, the push-pull part comprises a connecting piece, the connecting piece is slidably arranged in the guide groove, the connecting piece is provided with a groove, and the rivet joint is embedded in the groove.

According to some embodiments of the utility model, the push-pull portion further comprises a push-pull ring, which is snap-connected with the connector.

According to some embodiments of the utility model, the push-pull ring is provided with two, two of which are symmetrical about the guide groove.

According to some embodiments of the utility model, the proximal end of the guide rod is provided with a fixation ring.

According to some embodiments of the utility model, the ferrule is surrounded by a single strand of nitinol wire, with both the ends of the nitinol wire being connected to the distal end of the core wire in traction and convergent within the sheath.

According to some embodiments of the utility model, the nitinol wire is looped to form a ferrule section and a necked section, the ferrule section and the necked section are smoothly connected in a transitional manner and are spliced into a circle, and the necked section is far away from the core wire relative to the ferrule section.

According to some embodiments of the utility model, the proximal end of the ferrule head is connected to the distal end of the core wire by a second rivet tube, which is riveted to the proximal end of the ferrule head, the distal end of the core wire, the second rivet tube being reciprocally movable along the axial direction of the sheath tube following the core wire.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic illustration of the cooperation of a handle with a sheath and a core wire in an embodiment of the present utility model;

FIG. 3 is a schematic diagram showing the cooperation of the push-pull part with the guide rod and the core wire in the embodiment of the utility model;

fig. 4 is a schematic diagram illustrating the cooperation of a core wire with a ferrule head and a sheath in an embodiment of the present utility model.

Reference numerals: sheath tube 1, bell mouth 11, core wire 2, ferrule head 3, nitinol wire 31, ferrule section 311, necking section 312, handle 4, grip 41, grip 411, first round table 4111, anti-slip pattern 4112, press block 412, second round table 4121, guide bar 413, guide groove 4131, fixing ring 4132, push-pull section 42, connecting piece 421, groove 422, push-pull ring 423, first rivet pipe 5, rivet head 6, second rivet pipe 7.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions, such as proximal, distal, inner, outer, etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

In the description of the present utility model, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as threading, arranging, mounting, connecting, ferrules, cutting and the like should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by those skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 4, the present utility model discloses a snare comprising a sheath tube 1, a core wire 2, a snare head 3 and a handle 4.

Wherein, referring to fig. 2 and 4, the core wire 2 is arranged in the sheath tube 1 in a penetrating way, the core wire 2 can reciprocate along the axial direction of the sheath tube 1, it can be understood that the sheath tube 1 and the core wire 2 can be bent to adapt to the bending environment in the human body

Referring to fig. 4, the snare head 3 is adapted to snare and cut an object to be resected, a proximal end of the snare head 3 is traction-connected with a distal end of the core wire 2 and is retracted within the sheath tube 1, and the snare head 3 expands or contracts when the core wire 2 reciprocates in an axial direction of the sheath tube 1.

Referring to fig. 1 and 2, the handle 4 includes a grip 41 and a push-pull portion 42 slidably coupled to the grip 41, the grip 41 being coupled to the proximal end of the sheath 1, and the proximal end of the core wire 2 extending out of the sheath 1 and being coupled to the push-pull portion 42.

The snare does not need to be electrified, a user can operate the handle 4, hold the holding part 41 by hand, push the push-pull part 42 to the far end or pull the push-pull part to the near end, so that the core wire 2 can reciprocate in the sheath tube 1, the snare head 3 is driven to be opened or contracted, the snare head 3 can be used for snare a to-be-resected object after being opened, the to-be-resected object can be gradually tightened in the contraction process, and finally the to-be-resected object is cut off, thereby achieving the purpose of resection and being very convenient to operate.

Referring to fig. 2, in some embodiments of the present utility model, the grip 41 includes a grip 411 and a press block 412, the press block 412 is detachably connected to the grip 411, and the proximal end of the sheath 1 may be fixed between the grip 411 and the press block 412, thereby achieving quick assembly and disassembly of the grip 41 from the sheath 1.

The handle 411 may be specifically in a hollow structure, the proximal end of the sheath tube 1 may extend into the interior of the handle 411, the pressing block 412 is in a hollow structure and may be penetrated by the core wire 2, the pressing block 412 is detachably inserted into the handle 411, the pressing block 412 may compress the proximal end of the sheath tube 1 in the interior of the handle 411, the core wire 2 penetrates through the pressing block 412 and the handle 411 from the near to the far in sequence, and the core wire 2 and the sheath tube 1 are convenient to install.

Referring to fig. 2, the pressing block 412 is in threaded connection with the grip 411, a flare 11 is disposed at the proximal end of the sheath tube 1, a first round table surface 4111 is disposed on the inner surface of the grip 411, a second round table surface 4121 is disposed on the outer surface of the pressing block 412, the flare 11 can be pressed between the first round table surface 4111 and the second round table surface 4121, the quick assembly and disassembly of the holding portion 41 and the sheath tube 1 can be realized, the sheath tube 1 can be effectively fastened, and when the sheath tube 1 passes through the grip 411 from the near to the far, the flare 11 can also play a role of stopping and positioning, and the sheath tube 1 is locked with the grip 411 through the pressing block 412.

The distal end of the core wire 2 and the ferrule head 3 can be synchronously and sequentially penetrated through the pressing block 412 and the sheath 1 from the near to the far according to the requirement; the proximal end of the core wire 2 may be passed through the sheath 1 and the press block 412 in this order from the far to the near direction.

Referring to fig. 1, in some embodiments, the outer surface of the grip 411 is provided with a plurality of anti-slip lines 4112 along the circumferential direction to increase friction, so as to facilitate the grip 411 to be held by a user.

In addition, the holding portion 41 further includes a guide rod 413, wherein a distal end of the guide rod 413 is in snap-fit connection with a proximal end of the pressing block 412, so that the guide rod 413 is quickly connected with the pressing block 412, and the guide rod 413 is slidably connected with the push-pull portion 42.

Referring to fig. 2, a guide groove 4131 is disposed inside the guide bar 413, the length direction of the guide groove 4131 extends from the proximal end to the distal end, the proximal end of the core wire 2 is disposed through the guide groove 4131 and connected to the push-pull portion 42, and a passage for the core wire 2 to pass through can also limit the moving direction of the push-pull portion 42.

Referring to fig. 3, in order to facilitate connection of the core wire 2 with the push-pull portion 42, a first rivet pipe 5 is riveted on the outer surface of the proximal end of the core wire 2, a rivet joint 6 is provided at the proximal end of the first rivet pipe 5, the rivet joint 6 is simultaneously riveted with the proximal end of the first rivet pipe 5 and the proximal end of the core wire 2, the connection is firm, the rivet joint 6 is embedded in the push-pull portion 42, and the core wire 2 can be rapidly installed on the push-pull portion 42.

In some embodiments, referring to fig. 3, the push-pull portion 42 includes a connecting member 421, the connecting member 421 is slidably disposed in the guide groove 4131, the connecting member 421 is provided with a groove 422, the rivet 6 is embedded in the groove 422, and the connecting member 421 can slide in the guide groove 4131 and can be conveniently overlapped with the rivet 6.

In addition, the push-pull portion 42 further includes a push-pull ring 423, where the push-pull ring 423 is snap-connected to the connecting member 421. It will be appreciated that during assembly, the rivet head 6 at the proximal end of the core wire 2 extends out of the guide groove 4131 and is embedded in the groove 422, then the connecting member 421 is inserted into the guide groove 4131, and then the push-pull ring 423 is connected with the connecting member 421 in a snap-fit manner, so that the connecting member 421 is prevented from being separated from the guide groove 4131, and the quick installation of the core wire 2 and the connecting member 421 is completed.

Referring to fig. 1 and fig. 2, two push-pull rings 423 may be specifically provided, the two push-pull rings 423 are symmetrical about the guide groove 4131, a user hooks into the two push-pull rings 423 through two fingers, and the push-pull drives the push-pull rings 423 to slide in the guide groove 4131, so that the two push-pull rings 423 can maintain the balance of the push-pull action, and are also beneficial to the user to apply acting force, and the operation is convenient.

In addition, in some embodiments, the proximal end of the guide rod 413 is further provided with a fixing ring 4132, and the fixing ring 4132 facilitates the finger of the user to pass through, so as to maintain the position of the holding portion 41, and further facilitate the relative sliding of the two push-pull rings 423.

Referring to fig. 4, in some embodiments of the present utility model, the ferrule head 3 is formed by encircling a single strand of nitinol wire 31, the end-to-end ends of the nitinol wire 31 are both connected with the distal end of the core wire 2 in a traction manner and are convergent within the sheath 1, and the nitinol wire 31 has good shape plasticity and is also capable of effectively cutting the object to be resected.

In order to guide the object to be cut to the preset position of the ferrule head 3, as shown in fig. 4, the nitinol wire 31 is looped to form a ferrule section 311 and a necking section 312, the ferrule section 311 and the necking section 312 are in smooth transition connection and are spliced into a circle, and the necking section 312 is far away from the core wire 2 relative to the ferrule section 311, so that the object to be cut can be gradually guided into the necking section 312 in the process of pulling the ferrule head 3, the object to be cut is prevented from being separated from the ferrule head 3, and the necking section 312 is also beneficial to directionally cutting the object to be cut. In addition, considering that the ferrule head 3 is substantially circular, when the ferrule head 3 is pulled into the interior of the sheath tube 1, the stress of the ferrule head 3 is concentrated at the distal end, and a small but hard circular ring is finally formed, so that the ferrule head 3 is difficult to enter or remove from the sheath tube 1, while the addition of the design of the necking section 312 can effectively avoid the situation, the necking section 312 is arranged to disperse the extruded stress, and the diameter of the distal end of the ferrule head 3 is reduced, so that the ferrule head 3 is convenient to enter or remove from the sheath tube 1.

In order to connect the ferrule head 3 and the core wire 2, the proximal end of the ferrule head 3 is connected with the distal end of the core wire 2 through the second riveting pipe 7, the second riveting pipe 7 is riveted with the proximal end of the ferrule head 3 and the distal end of the core wire 2, the connection is very firm, and it is understood that the second riveting pipe 7 can reciprocate in the sheath tube 1 along the axial direction of the sheath tube 1 along with the core wire 2.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

Of course, the present utility model is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications or substitutions are included in the scope of the present utility model as defined in the claims.

Claims (15)

1. A snare, comprising:

a sheath;

the core wire penetrates through the sheath tube, and can reciprocate along the axial direction of the sheath tube;

the device comprises a ferrule head, a core wire, a sheath tube and a cutting head, wherein the ferrule head is suitable for ferrules and cutting objects to be resected, the proximal end of the ferrule head is in traction connection with the distal end of the core wire and is contracted in the sheath tube, and when the core wire moves back and forth along the axial direction of the sheath tube, the ferrule head expands or contracts;

the handle comprises a holding part and a push-pull part which is connected with the holding part in a sliding way, the holding part is connected with the proximal end of the sheath tube, and the proximal end of the core wire extends out of the sheath tube and is connected with the push-pull part.

2. The snare of claim 1, wherein the grip comprises:

a grip;

and the pressing block is detachably connected with the grip, and the proximal end of the sheath tube can be fixed between the grip and the pressing block.

3. The snare of claim 2, wherein the grip is hollow, the interior of the grip is configured to allow the proximal end of the sheath to extend into the grip, the press block is hollow and configured to allow the core wire to pass through the grip, the press block is removably insertable into the grip, and the press block is configured to compress the proximal end of the sheath into the interior of the grip.

4. The snare of claim 3, wherein the press block is threadably connected to the handle, a proximal end of the sheath is provided with a flare, an inner surface of the handle is provided with a first rounded surface, an outer surface of the press block is provided with a second rounded surface, and the flare is compressible between the first rounded surface and the second rounded surface.

5. The snare of claim 4, wherein an outer surface of the grip is circumferentially provided with a plurality of non-slip ridges.

6. The snare of claim 2, wherein the grip further comprises a guide bar, a distal end of the guide bar being snap-fit to a proximal end of the pusher block, the guide bar being slidably coupled to the push-pull portion.

7. The snare of claim 6, wherein the guide bar has a guide slot disposed therein, and wherein the proximal end of the core wire extends through the guide slot and is connected to the push-pull portion.

8. The snare of claim 7, wherein a first rivet tube is riveted to a proximal outer surface of the core wire, a rivet head is provided at a proximal end of the first rivet tube, the rivet head is simultaneously riveted to a proximal end of the first rivet tube and a proximal end of the core wire, and the rivet head is embedded within the push-pull portion.

9. The snare of claim 8, wherein the push-pull portion comprises a connector slidably disposed within the guide channel, the connector being recessed, the rivet head being embedded within the recess.

10. The snare of claim 9, wherein the push-pull portion further comprises a push-pull ring that snap-connects with the connector.

11. The snare of claim 10, wherein there are two push-pull rings, two of which are symmetrical about the guide groove.

12. The snare of claim 6, wherein a proximal end of the guide bar is provided with a securing ring.

13. The snare of claim 1, wherein the snare head is surrounded by a single strand of nitinol wire, the nitinol wire having both ends at the head and tail thereof being in traction connection with the distal end of the core wire and being cinched within the sheath.

14. The snare of claim 13, wherein the nitinol wire is looped to form a loop segment and a necked-down segment, the loop segment and necked-down segment being joined in a rounded transition and joined together in a loop, the necked-down segment being distal from the core wire relative to the loop segment.

15. The snare of claim 1 or 13, wherein the proximal end of the snare head is connected to the distal end of the core wire by a second rivet tube, the second rivet tube being riveted to the proximal end of the snare head, the distal end of the core wire, the second rivet tube being reciprocally movable along the axial direction of the sheath tube following the core wire.

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