A biopsy forceps head assembly and biopsy forceps

Abstract

The invention discloses a biopsy forceps head assembly and a biopsy forceps. The forceps head assembly includes a forceps head support, a first forceps head, a second forceps head, a limiter, a pulling mechanism and a rivet; the first forceps head and the second forceps head are arranged opposite to each other in a long groove of the forceps head support; the forceps handle of the first forceps head, the forceps handle of the second forceps head and the front end of the pulling mechanism are riveted by a rivet; the pulling mechanism extends backward from the tube cavity of the hollow tube of the forceps head support; a limiter is arranged between the first forceps head and the second forceps head, and the two ends of the limiter are respectively fixed to the first support and the second support of the forceps head support; the pulling mechanism is pushed forward, and the front ends of the first forceps head and the second forceps head are opened under the action of the limiter; the pulling mechanism is pulled backward, and the first forceps head and the second forceps head are closed under the limitation of the forceps head support. The above-mentioned biopsy forceps only push and pull the first forceps head and the second forceps head through the pulling mechanism, and the structure is simple, the assembly is convenient, and a small-sized biopsy forceps can be realized.

Description

Technical Field

[0001] The invention relates to a biopsy forceps head assembly and also to a biopsy forceps using the forceps head assembly, belonging to medical instruments. Background Art

[0002] In recent years, endoscopy has been widely used as an auxiliary diagnostic method in clinical medical examinations. When examining the lesions in the patient's body, the biopsy forceps can be inserted into the body through the endoscope channel to clamp the lesion tissue. Sampling through an endoscope is minimally invasive and painful, so endoscopy is a popular diagnostic method.

[0003] With the development of medical technology, endoscopic and bronchoscope biopsy techniques through the nasal cavity have been developed, which are more acceptable to the human body. In order to adapt to small-sized lumens, the size of the biopsy forceps needs to be reduced. When the size of the biopsy forceps is reduced, higher requirements are placed on the structural strength and assembly of the biopsy forceps. However, the existing four-bar biopsy forceps have many parts, complex structures, and large sizes. If the size is directly reduced, the structural strength of some parts cannot be guaranteed. Moreover, due to the limitations of product size and the strength of powder metallurgy injection molding materials, the size of the hole in the middle of the handle is too small, and the hole in the middle of the handle often breaks, which easily leads to unstable reliability and other situations. Summary of the invention

[0004] The primary technical problem to be solved by the present invention is to provide a biopsy forceps head assembly.

[0005] Another technical problem to be solved by the present invention is to provide a biopsy forceps.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] According to a first aspect of the present invention, a biopsy forceps head assembly is provided, comprising: a forceps head support, a first forceps head, a second forceps head, a stopper, a pulling mechanism and a rivet.

[0008] The clamp head bracket includes an integrally formed hollow tube, a first bracket and a second bracket, the first bracket and the second bracket are arranged opposite to each other at the front end of the hollow tube, and a long groove for accommodating the first clamp head and the second clamp head is defined between the first bracket and the second bracket;

[0009] The first clamp head and the second clamp head are arranged in a long slot of the clamp head bracket facing each other and can move in the long slot;

[0010] The rear end of the first clamp head, the rear end of the second clamp head and the front end of the pulling mechanism are riveted together by a rivet; the pulling mechanism extends backward from the lumen of the hollow tube;

[0011] A limit piece is provided between the first clamp head and the second clamp head, and two ends of the limit piece are respectively fixed on the first bracket and the second bracket, and the limit piece is used to limit the maximum stroke of the pulling mechanism pushing forward;

[0012] Push the pulling mechanism forward, and under the action of the limiter, the front ends of the first clamp head and the second clamp head are opened; pull the pulling mechanism backward, and under the limitation of the clamp head bracket, the front ends of the first clamp head and the second clamp head are closed.

[0013] Preferably, the outer diameter of the clamp head support is between 1.8 and 3.0 mm, or the outer diameter of the clamp head support is between 0.8 and 1.2 mm.

[0014] Preferably, the first pliers head and the second pliers head respectively include a pliers head spoon and a long pliers handle, and the pliers head spoon and the long pliers handle are integrally formed; the long pliers handle includes a handle body and a connecting portion, and the handle body is used to connect the pliers head spoon and the connecting portion;

[0015] The width of the pliers spoon is greater than the width of the handle, and the center line of the handle coincides with the center line of the pliers spoon; the handle has the same arc section along the length direction, and the arc section faces the opening direction of the pliers spoon;

[0016] The width of the handle body is greater than that of the connecting portion. In the width direction, the connecting portion is arranged offset from the axis of the handle body. Furthermore, the connecting portion protrudes inwardly of the handle body. The connecting portion is provided with a connecting hole, and the axis of the connecting hole is perpendicular to the length direction of the long pliers handle.

[0017] Preferably, the rear end of the first pliers head and the rear end of the second pliers head facing each other have an inclined profile.

[0018] According to a second aspect of the present invention, a biopsy forceps is provided, comprising the above-mentioned forceps head support, and also comprising a spring tube, a drawing wire and an operating handle, wherein the front end of the spring tube is fixed to the rear end of the forceps head support, and the rear end of the spring tube is fixed to the operating handle; the rear end of the pulling mechanism is fixed to the front end of the drawing wire, the drawing wire extends backward from the spring tube, and the rear end of the drawing wire is fixed to the operating handle.

[0019] The biopsy forceps provided by the present invention improve the forceps head assembly, remove the four-bar structure in the forceps head assembly, and only use a pulling mechanism to push and pull the rear ends of the first forceps head and the second forceps head. Combined with the limiting function of the limiter and the forceps head bracket, the opening and closing of the first forceps head and the second forceps head are realized. The structure is simple and the assembly is convenient. Therefore, under the premise of ensuring structural strength and processing stability, a biopsy forceps with an outer diameter of about 2 mm or even smaller can be manufactured, making it suitable for passing through a small-sized lumen (for example, the nasal cavity, trachea) and performing a biopsy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1is a schematic diagram of a closed state of the biopsy forceps provided in the first embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of a cutaway state of the biopsy forceps shown;

[0022] Figure 3 is a schematic diagram of the biopsy forceps provided in the first embodiment of the present invention in an open state;

[0023] Figure 4 yes Figure 3 A schematic diagram of a cutaway state of the biopsy forceps shown;

[0024] Figure 5 is a schematic structural diagram of the clamp head support used in the first embodiment;

[0025] Figure 6 is a schematic diagram of the structure of the square pin used in the first embodiment;

[0026] Figure 7 is a schematic diagram of the structure of the sampling needle used in the first embodiment;

[0027] Figure 8 yes Figure 6 Square pins shown and Figure 7 Schematic diagram of the fixed state of the sampling needle shown;

[0028] Fig. 9 is a schematic structural diagram of the clamp head used in the first embodiment;

[0029] Fig.10 is a schematic structural diagram of the biopsy forceps provided in the second embodiment of the present invention;

[0030] Fig.11 It is a schematic diagram of the connection between two forceps heads and a pulling mechanism in the biopsy forceps provided in the second embodiment;

[0031] Fig.12 is a schematic structural diagram of the clamp head support used in the second embodiment;

[0032] Fig.13 is a schematic structural diagram of the clamp head used in the second embodiment;

[0033] Fig.14 Schematic diagram of the structure of the pulling mechanism used in the second embodiment. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The present invention provides a simple biopsy forceps, which reduces the number of parts of the biopsy forceps, simplifies the assembly, and reduces the overall size of the biopsy forceps by simplifying the structure of the forceps head assembly, so that the biopsy forceps can be used for biopsy operations through small-sized lumens (e.g., nasal cavities). In the following description, the side of the biopsy forceps close to the diseased part is the front end, also called the distal end, and the side of the biopsy forceps close to the operating handle is the rear end, also called the proximal end.

[0036] First embodiment

[0037] like Figures 1 to 4 As shown, the biopsy forceps head assembly provided in this embodiment includes a forceps head support 1, a limiter 2, a first forceps head 3, a second forceps head 4, a rivet 5 and a pulling mechanism.

[0038] Among them, Figure 5 As shown, the clamp head bracket 1 includes an integrally formed hollow tube 10, a first bracket 12 and a second bracket 13; the hollow tube 10 defines a hollow lumen 11, and the outer diameter of the hollow tube 10 can be controlled between 1.8 and 3.0 mm (for example, controlled between 2.35 and 2.45 mm) or the size can be modified according to the specifications of the biopsy forceps. The outer diameter of the hollow tube 10 defines the outer diameter of the clamp head bracket 1, and further defines the outer diameter of the clamp head assembly; the axis of the hollow tube 10 is consistent with the axis of the clamp head assembly; the first bracket 12 and the second bracket 13 are arranged opposite to each other at the front end of the hollow tube 10, and a long groove 14 for accommodating the first clamp head 3 and the second clamp head 4 is defined between the first bracket 12 and the second bracket 13, and the length direction of the long groove 14 is consistent with the axial direction of the hollow tube 10.

[0039] The first clamp head 3 and the second clamp head 4 are arranged in the long slot 14 of the clamp head bracket 1 facing each other, and the first clamp head 3 and the second clamp head 4 can move in the long slot 14 of the clamp head bracket 1. The rear end 33 of the first clamp head 3, the rear end 43 of the second clamp head 4 and the front end of the pulling mechanism are riveted by a rivet 5 (such as a rivet) (see Figure 4 ); The pulling mechanism extends backward from the lumen 11 of the hollow tube 10.

[0040] A limit member 2 is disposed between the first clamp head 3 and the second clamp head 4, and both ends of the limit member 2 are respectively fixed on the first bracket 12 and the second bracket 13. The limit member 2 is used to limit the maximum travel of the pulling mechanism pushing forward.

[0041] like Figure 1 and Figure 2As shown, by pulling the pulling mechanism backward, under the limitation of the long groove 14 of the clamp head support 2, the bottom of the long groove 14 forces the front ends of the first clamp head 3 and the second clamp head 4 to close. At the same time, during the closing process of the first clamp head 3 and the second clamp head 4, the two sides of the long groove 14 also limit the long clamp handles of the first clamp head 3 and the second clamp head 4, thereby enhancing the stability of the two clamp heads. Figure 3 and Figure 4 As shown, by pushing the pulling mechanism forward, under the action of the stopper 2, the front ends of the first clamp 3 and the second clamp 4 are opened; when the front end of the pulling mechanism abuts against the bottom of the stopper 2, the stopper 2 prevents the pulling mechanism from moving forward, and the pulling mechanism stops pushing forward. Figure 2 The figure shows the limit position of the pulling mechanism pulling backward. Figure 4 The figure shows the limit position of the pulling mechanism being pushed forward. It can also be seen from the figure that in a small-sized biopsy forceps, the moving distance of the front end of the pulling mechanism is very short and the operating space is narrow.

[0042] like Figures 2 to 4 As shown, this embodiment provides a needle biopsy forceps, and the forceps head assembly also includes a sampling needle 8, and the rear end of the sampling needle 8 is fixed to the middle part of the limiter 2. By arranging the sampling needle 8 between the first forceps head 3 and the second forceps head 4, continuous multiple sampling can be achieved, and the samples can be stored on the entire sampling needle 8.

[0043] like Figure 5 As shown, in the clamp head bracket 1 provided in this embodiment, a first fixing groove 15 is provided at the front end of the first bracket 12, and a second fixing groove 16 is provided at the front end of the second bracket 13. The first fixing groove 15 and the second fixing groove 16 are arranged opposite to each other, and the length direction of the first fixing groove 15 and the second fixing groove 16 is consistent with the axial direction of the hollow tube 10, and the depth of the first fixing groove 15 and the second fixing groove 16 is less than the depth of the long groove 14. The two ends of the stopper 2 are respectively fixed to the first fixing groove 15 and the second fixing groove 16, so that the stopper 2 is fixed to the front ends of the first bracket 12 and the second bracket 13.

[0044] In order to facilitate the fixation of the limit member 2 and the sampling needle 8, the cross-sectional shape of the first fixing groove 15 and the second fixing groove 16 is designed to be rectangular, and the cross-sectional shape of the limit member 2 is designed to be rectangular; the two ends of the limit member 2 are respectively placed in the first fixing groove 15 and the second fixing groove 16, and then welded and fixed.

[0045] like Figure 6 and Figure 8 As shown, a third fixing groove 21 is provided in the middle of the stopper 2, and the opening of the third fixing groove 21 faces forward, so that a larger plane is formed at the bottom of the third fixing groove 21, which is conducive to the fixation of the sampling needle 8. The rear end 82 of the sampling needle 8 is fixed in the third fixing groove 21.

[0046] The structure of the sampling needle 8 is as follows Figure 7 As shown, the sampling needle 8 includes a cylindrical needle body 80 and a conical needle tip 81. The bottom of the cylindrical needle body 80 (i.e., the rear end 82 of the sampling needle) is fixed to the third fixing groove 21 (see Figure 8 In this embodiment, a needle-type sampling needle 8 is used to facilitate insertion and sample storage during the biopsy operation, and multiple consecutive sampling can be achieved at the same lesion site without multiple advance and retreat clamp operations.

[0047] The structure of the first clamp head 3 used in this embodiment is as follows: Fig. 9 As shown, the structure of the second pliers 4 is the same as that of the first pliers 3. Both the first pliers 3 and the second pliers 4 are designed with long pliers handles.

[0048] like Fig. 9 As shown, the first clamp head 3 includes a clamp head spoon 30 and a long clamp handle 31. The clamp head spoon 30 is located at the front end of the first clamp head 3, and the clamp head spoon 30 is connected to the front end of the long clamp handle 31. The clamp head spoon 30 and the long clamp handle 31 are integrally formed. Preferably, it is recommended to use powder metallurgy to manufacture the first clamp head 3 and the second clamp head 4. Preferably, a window 35 can be set in the clamp head spoon 30, through which the tissue stored on the sampling needle 8 can be observed, which is conducive to the biopsy operation.

[0049] The description is made with the opening direction of the pliers head spoon 30 as the inner side, the axial direction of the long pliers handle 31 as the length direction, and the direction perpendicular to the length direction of the long pliers handle 31 as the width direction. The long pliers handle 31 includes a handle body 32 located in the middle of the first pliers head 3 and a connecting portion 33 located at the rear end of the first pliers head 3. The handle body 32 refers to an arc-shaped portion of the long pliers handle 31 with a medium width and thickness, and the handle body 32 is used to connect the pliers head spoon 30 and the connecting portion 33. A connecting hole 34 is provided on the connecting portion 33 for realizing riveting of the first pliers head 3 and the pulling mechanism.

[0050] The width of the forceps spoon 30 is greater than the width of the handle 32, and the center line of the handle 32 coincides with the center line of the forceps spoon 30. The handle 32 has the same arc-shaped cross section along the length direction, and the arc-shaped cross section faces the opening direction of the forceps spoon 30, that is, faces the inner side of the first forceps 3. Preferably, the handle 32 has a semicircular cross section. The handle 32 protrudes toward the outside of the forceps spoon 30 to form an inwardly facing groove, and the inside of the groove can be used to store samples. By extending the length of the handle 32, the storage space for the sample can be increased. Of course, considering the activity space of the small-sized biopsy forceps, the length of the handle 32 should not be too long.

[0051] The width of the handle 32 is greater than the width of the connecting portion 33, and the connecting portion 33 is arranged offset from the axis of the handle 32; in the width direction, the connecting portion 33 is offset to one side of the handle 32. In this way, when the tongs scoops 30 of the first tongs 3 and the second tongs 4 are arranged facing each other, the two tongs scoops 30 and the handle 32 can be aligned and closed by riveting the rear ends of the first tongs 3 and the second tongs 4 to the front end of the pulling mechanism.

[0052] like Fig. 9 As shown, the connection portion 33 is of equal width and protrudes toward the inner side of the handle body 32, and the protruding direction of the connection portion 33 is the same as the opening direction of the pliers head spoon 31. The connection portion 33 is provided with a connection hole 34, and the axis of the connection hole 34 is perpendicular to the length direction of the first pliers head 3, so that when the first pliers head 3, the second pliers head 4 and the pulling mechanism are riveted by the rivet 5, the first pliers head 3 and the second pliers head 4 can rotate around the rivet 5 to realize the opening and closing of the pliers head spoon. In this embodiment, the outer contour of the connection portion 33 around the connection hole 34 is in an arc shape, which can ensure the structural strength and processing stability of the small-sized pliers head.

[0053] In the clamp head assembly provided in this embodiment, by improving the structure of the first clamp head 3 and the second clamp head 4, the pin hole set in the middle of the handle body is omitted, the handle body is set as a groove that can accommodate the sample, and the first clamp head 3 and the second clamp head 4 are riveted through the connecting hole at the tail end. The first clamp head 3 and the second clamp head 4 rotate around the rivet set at the tail end, so that the sample can be stored on the sampling needle 8 between the clamp head scoop 31 and the handle body 32 of the two clamp heads, and is not limited by the structure of the clamp heads. In traditional biopsy forceps, a four-bar structure is used for driving, and the clamp heads rotate around the pins set in the handle body, so that the sample can only be stored between the two clamp head scoops. Compared with traditional biopsy forceps, the above-mentioned biopsy forceps undoubtedly greatly increase the storage space for samples; thereby, while reducing the overall size of the clamp head assembly, the sample storage space of the clamp head part is guaranteed, so that it can meet the needs of continuous multiple sampling of small-sized biopsy forceps.

[0054] Furthermore, in the above-mentioned pliers structure, by eliminating the hole in the middle of the handle body and setting the connection hole at the central axis position of the connection part located at the rear end of the first pliers 3 and the second pliers 4, the mechanical strength problem of the pliers is effectively solved. It can prevent the pliers from breaking during the manufacturing and use process. Moreover, since the overall size of the pliers assembly is reduced, only using the pulling mechanism to push and pull the rear ends of the first pliers 3 and the second pliers 4 can also provide the force required to force the two pliers to move, thereby meeting the use requirements of a small-sized pliers bracket.

[0055] Reference Figure 2 and Figure 4The pulling mechanism used in this embodiment includes a pull rod 6 and a connecting tube 7, and the lengths of the pull rod 6 and the connecting tube 7 are relatively short. The front end of the cylindrical pull rod 6 is provided with an annular connecting portion 60, and the rivet 5 passes through the annular connecting portion 60 to realize the riveting of the pulling mechanism and the first clamp head 3 and the second clamp head 4. The cylindrical pull rod 6 is inserted into the front end of the connecting tube 7 and fixed to form the pulling mechanism.

[0056] The biopsy forceps are manufactured using the forceps head assembly provided in this embodiment, and the biopsy forceps include the above-mentioned forceps head assembly, a wire drawing, a spring tube, and an operating handle. Among them, the rear end of the connecting tube 7 is fixed to the front end of the wire drawing (not shown), and the rear end of the wire drawing is fixed to the operating handle; the spring tube is sleeved on the outside of the wire drawing, the front end of the spring tube is fixed to the rear end of the forceps head bracket 1, and the rear end of the spring tube is fixed to the operating handle to form a biopsy forceps.

[0057] The biopsy forceps described above can reduce the size of the entire forceps head portion by simplifying the structure of the forceps head assembly, and can effectively realize the production of biopsy forceps used under nasal endoscopy, thereby overcoming the problems of complex assembly, small part size, and unstable strength reliability of existing biopsy forceps products. By reducing some parts through reasonable structural design, the parts of small-sized biopsy forceps can be optimized, the assembly difficulty can be reduced to the maximum extent, and the production efficiency can be improved. Moreover, by improving the forceps head structure, a storage sample space that cannot be provided by existing biopsy forceps is provided, thereby realizing the function of continuous sampling.

[0058] Second embodiment

[0059] like Fig.10 and Fig.11 As shown, the jaw assembly of the biopsy forceps provided in this embodiment includes a jaw support 201, a stopper 202, a first jaw 203, a second jaw 204, a rivet 205 and a pulling mechanism.

[0060] Among them, Fig.12 As shown, the clamp head bracket 201 includes an integrally formed hollow tube 210, a first bracket 212 and a second bracket 213; the hollow tube 210 defines a hollow lumen 211, and the outer diameter of the hollow tube 210 can be controlled between 0.8 and 1.2 mm or modified in size according to the specifications of the biopsy forceps. The outer diameter of the hollow tube 210 defines the outer diameter of the clamp head bracket 201, and further defines the outer diameter of the clamp head assembly; the axis of the hollow tube 210 is consistent with the axis of the clamp head assembly; the first bracket 212 and the second bracket 213 are arranged opposite to each other at the front end of the hollow tube 210, and a long groove 214 for accommodating the first clamp head 203 and the second clamp head 204 is defined between the first bracket 212 and the second bracket 213, and the length direction of the long groove 214 is consistent with the axial direction of the hollow tube 210.

[0061] The first clamp head 203 and the second clamp head 204 are disposed opposite to each other in the long slot 214 of the clamp head bracket 201, and the first clamp head 203 and the second clamp head 204 can move in the long slot 214 of the clamp head bracket 201. The rear end of the first clamp head 203, the rear end of the second clamp head 204 and the front end of the pulling mechanism are riveted by a rivet 205; the pulling mechanism extends backward from the tube cavity 211 of the hollow tube 210.

[0062] like Fig.10 As shown, a limiter 202 is provided between the first clamp head 203 and the second clamp head 204, and the two ends of the limiter 202 are respectively fixed on the first bracket 212 and the second bracket 213. The limiter 202 is used to limit the maximum position of the pulling mechanism pushed forward, and by pushing the pulling mechanism forward, under the action of the limiter 202, the front ends of the first clamp head 203 and the second clamp head 204 are opened; by pulling the pulling mechanism backward, under the limitation of the long slot 214 of the clamp head bracket 202, the first clamp head 203 and the second clamp head 204 are closed.

[0063] like Fig.12 As shown, in the clamp head bracket provided in this embodiment, a first circular hole 215 is opened on the first bracket 212, a second circular hole 216 is opened on the second bracket 213, and two ends of the cylindrical limiting member 202 are fixed to the first circular hole 215 and the second circular hole 216 respectively.

[0064] This embodiment provides a needleless biopsy forceps. By reducing the size of each part in the forceps head assembly, a smaller-sized biopsy forceps can be achieved. The outer diameter of the forceps head bracket can be controlled to about 1 mm, and the sizes of the first forceps head 203, the second forceps head 204, the limiter 202, and the rivet 205 are correspondingly reduced.

[0065] The structure of the first clamp head 203 used in this embodiment is as follows: Fig.13 As shown, the structure of the second clamp head 204 is the same as that of the first clamp head 203. Both the first clamp head 203 and the second clamp head 204 are designed with long clamp handles. The structure of the clamp head used in the second embodiment is similar to that of the clamp head used in the first embodiment, but the size is smaller and can only be used for single sampling. In order to meet the use requirements of a smaller size, the structure of the clamp head used in the second embodiment is slightly different from that of the clamp head used in the first embodiment.

[0066] like Fig.13 As shown, the first clamp head 203 includes a clamp head spoon 230 and a long clamp handle 231. The clamp head spoon 230 is located at the front end of the first clamp head 203, and the clamp head spoon 230 is connected to the front end of the long clamp handle 231. The clamp head spoon 230 and the long clamp handle 231 are integrally formed.

[0067] The description is made with the opening direction of the pliers head spoon 230 as the inner side, the axial direction of the long pliers handle 231 as the length direction, and the direction perpendicular to the length direction of the long pliers handle 231 as the width direction. The long pliers handle 231 includes a handle body 232 located in the middle of the first pliers head 203 and a connecting portion 233 located at the rear end of the first pliers head 203. The handle body 232 refers to an arc-shaped portion of the long pliers handle 231 with a medium width and thickness, and the handle body 232 is used to connect the pliers head spoon 230 and the connecting portion 233. A connecting hole 234 is provided on the connecting portion 233 for realizing riveting of the first pliers head 203 and the pulling mechanism.

[0068] The width of the forceps spoon 230 is greater than the width of the handle 232, and the center line of the handle 232 coincides with the center line of the forceps spoon 230. The handle 232 has the same arc-shaped cross section along the length direction, and the arc-shaped cross section faces the opening direction of the forceps spoon 230, that is, faces the inner side of the first forceps 203. Preferably, the handle 232 has a semicircular cross section. The handle 232 protrudes toward the outside of the forceps spoon 230 to form an inner groove, and the inside of the groove can be used to store samples. By extending the length of the handle 232, the storage space for the sample can be increased. Of course, considering the activity space of the small-sized biopsy forceps, the length of the handle 232 should not be too long.

[0069] The width of the handle 232 is greater than the width of the connecting portion 233, and the connecting portion 233 is arranged offset from the axis of the handle 232; in the width direction, the connecting portion 233 is offset to one side of the handle 232. In this way, when the tongs scoops 230 of the first tongs 203 and the second tongs 204 are arranged facing each other, the two tongs scoops and the handle can be aligned and closed by riveting the rear ends of the first tongs 203 and the second tongs 204 to the front end of the pulling mechanism.

[0070] like Fig.13 As shown, the connection part 233 protrudes toward the inner side of the handle body 232, and the protruding direction of the connection part 233 is the same as the opening direction of the pliers head spoon 231. The connection part 233 is provided with a connection hole 234, and the axis of the connection hole 234 is perpendicular to the length direction of the first pliers head 203, so that when the first pliers head 203, the second pliers head 204 and the pulling mechanism are riveted by the rivet 205, the first pliers head 203 and the second pliers head 204 can rotate around the rivet 205 to realize the opening and closing of the pliers head spoon. Since the size of the first pliers head 203 and the second pliers head 204 is small, the size of the connection part 233 is very small, and the size of the connection hole 234 provided in the connection part 233 also needs to be greatly reduced, so as to ensure the stability of the pliers head structure.

[0071] In this embodiment, in order to make the first pliers 203 and the second pliers 204 adapt to the small-sized pliers bracket 201, the contour of the connecting portion 233 close to the inner side is inclined, that is, the rear end of the first pliers 203 and the rear end of the second pliers 204 facing each other have an inclined contour. Compared with the structure in which the entire contour is an arc, during the rotation of the first pliers 203 and the second pliers 204, the movable space required by the connecting portion 233 provided with the inclined contour is also reduced.

[0072] Reference Fig.14 In order to adapt to the small-sized clamp head bracket and clamp head and to ensure the operational stability of the pulling mechanism, the pulling mechanism used in this embodiment includes a filament 206 and a connecting tube 207. The diameter of the filament 206 ranges from 0.19 to 0.2 5 The filament 206 is folded in half, and a ring-shaped connecting portion 261 is formed in the middle of the filament 206. The filament 206 is connected to the rivet 205 through the ring-shaped connecting portion 261. There are multiple connection points between the portions 262 and 263 of the filament 206 extending from the middle to both ends. Preferably, a connection point 264 is provided at a position of the filament 206 close to the ring-shaped connecting portion 261, connection points 265 are provided at both ends of the filament 206, and multiple connection points 266 are provided between the connection point 264 and the connection point 265.

[0073] In the pulling mechanism provided in this embodiment, the end of the filament 206 is inserted into one end of the connecting tube 207 for fixation, and then the pulling mechanism, the drawing wire and the operating handle are fixed through the connecting tube 207.

[0074] In this embodiment, by using the folded filament 206 to pull the two clamp heads, not only the size of the pulling mechanism is reduced, but also the strength of the pulling action is ensured. The length of the folded filament 206 is not less than 60 mm (for example, 100 mm), and by arranging the connecting tube 207 with a larger diameter at a position farther from the clamp heads, it can be ensured that the portion with a smaller outer diameter of the biopsy forceps has a longer length, which facilitates the biopsy forceps to extend into a small-sized lumen and move in the lumen.

[0075] The biopsy forceps are manufactured using the forceps head assembly provided in this embodiment, and the biopsy forceps include the above-mentioned forceps head assembly, a wire drawing, a spring tube, and an operating handle. Among them, the rear end of the connecting tube 207 is fixed to the front end of the wire drawing (not shown), and the rear end of the wire drawing is fixed to the operating handle; the spring tube is sleeved on the outside of the wire drawing, the front end of the spring tube is fixed to the rear end of the forceps head bracket 201, and the rear end of the spring tube is fixed to the operating handle, forming a biopsy forceps.

[0076] Compared with the biopsy forceps provided in the first embodiment, the biopsy forceps provided in the second embodiment can be made into a smaller size and can adapt to a smaller lumen (such as the nasal cavity).

[0077] In summary, the biopsy forceps provided by the present invention eliminates the four-bar structure in the forceps head assembly, and only uses a pulling mechanism to push and pull the rear ends of the first forceps head and the second forceps head. Combined with the limiting function of the limiter and the forceps head bracket, the opening and closing of the first forceps head and the second forceps head are achieved. The structure is simple and easy to assemble, so that a small-sized biopsy forceps can be achieved, making it suitable for passing through a small-sized lumen and performing a biopsy operation.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0079] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0080] The above is a detailed description of the biopsy forceps head assembly and the biopsy forceps provided by the present invention. For those skilled in the art, any obvious changes made to the biopsy forceps without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal liabilities.

Claims

1. A biopsy forceps head assembly, characterized in that include: A clamp head bracket, a first clamp head, a second clamp head, a limiter, a pulling mechanism and a riveted part, The clamp head bracket includes an integrally formed hollow tube, a first bracket and a second bracket, the first bracket and the second bracket are arranged opposite to each other at the front end of the hollow tube, and a long groove for accommodating the first clamp head and the second clamp head is defined between the first bracket and the second bracket; The first clamp head and the second clamp head can be opened and closed, and are movably arranged in the long slot of the clamp head bracket; the rear end of the first clamp head, the rear end of the second clamp head and the front end of the pulling mechanism are connected to each other in a relatively rotatable manner and are riveted by the rivet; the pulling mechanism extends backward from the lumen of the hollow tube; wherein the clamp head assembly of the biopsy forceps includes a sampling needle; The limiting member is provided between the first clamp head and the second clamp head, and the two ends of the limiting member are respectively fixed on the first bracket and the second bracket, and the limiting member is used to limit the maximum stroke of the pulling mechanism pushing forward; The rear end of the first clamp head and the rear end of the second clamp head facing each other have an inclined profile, which is used to cooperate with the limiting member to open or close the first clamp head and the second clamp head; The pulling mechanism includes a pulling rod, and an annular connecting portion is arranged at the front end of the pulling rod. The rivet passes through the annular connecting portion to realize the riveting of the pulling mechanism with the first clamp head and the second clamp head. It is characterized in that the rear end of the sampling needle is fixed to the middle part of the limiting member, and the pulling mechanism further includes a connecting tube, and the pulling rod is inserted into the front end of the connecting tube for fixing.

2. The biopsy forceps head assembly according to claim 1, characterized in that: The outer diameter of the clamp head support is between 1.8 and 3.0 mm, or the outer diameter of the clamp head support is between 0.8 and 1.2 mm.

3. The biopsy forceps head assembly according to claim 1, characterized in that: The first bracket is provided with a first circular hole, the second bracket is provided with a second circular hole, and two ends of the position-limiting member are respectively fixed to the first circular hole and the second circular hole.

4. The biopsy forceps head assembly according to claim 1, characterized in that: The first bracket is provided with a first fixing groove, the second bracket is provided with a second fixing groove, both ends of the limiting member are respectively fixed to the first fixing groove and the second fixing groove, and the depth of the first fixing groove and the second fixing groove is less than the depth of the long groove.

5. The biopsy forceps head assembly according to claim 4, characterized in that: The cross-sections of the first fixing groove and the second fixing groove are rectangular, and the cross-section of the limiting member is rectangular.

6. The biopsy forceps head assembly according to claim 5, characterized in that: The sampling needle comprises a cylindrical needle body and a conical needle tip.

7. The biopsy forceps head assembly according to claim 5, characterized in that: A third fixing groove is formed in the middle of the position-limiting member, and the rear end of the sampling needle is fixed in the third fixing groove.

8. The biopsy forceps head assembly according to claim 1, characterized in that: The first pliers head and the second pliers head respectively include a pliers head spoon and a long pliers handle, wherein the pliers head spoon and the long pliers handle are integrally formed; the long pliers handle includes a handle body and a connecting portion, wherein the handle body is used to connect the pliers head spoon and the connecting portion; The width of the pliers spoon is greater than the width of the handle, and the center line of the handle coincides with the center line of the pliers spoon; the handle has the same arc-shaped cross section along the length direction, and the arc-shaped cross section faces the opening direction of the pliers spoon; The width of the handle body is greater than the width of the connecting portion, and in the width direction, the connecting portion is arranged to deviate from the axis of the handle body; and the connecting portion protrudes toward the inner side of the handle body, and the connecting portion is provided with a connecting hole, and the axis of the connecting hole is perpendicular to the length direction of the long pliers handle.

9. The biopsy forceps head assembly according to claim 1, characterized in that: The pulling mechanism includes a filament and a connecting tube. The filament is folded in half, and a ring-shaped connecting portion is formed in the middle of the filament. There are multiple connection points between the parts of the filament extending from the middle to both ends; the rear end of the filament is fixed to the front end of the connecting tube.

10. The biopsy forceps head assembly according to claim 9, characterized in that: The diameter of the filament is between 0.19 and 0.25 mm, and the length of the filament after being folded in half is not less than 60 mm.

11. A biopsy forceps, comprising the forceps head assembly according to any one of claims 1 to 10, further comprising a spring tube, a drawing wire and an operating handle, wherein: The front end of the spring tube is fixed to the rear end of the pliers head bracket, and the rear end of the spring tube is fixed to the operating handle; the rear end of the pulling mechanism is fixed to the front end of the drawing wire, the drawing wire extends backward from the spring tube, and the rear end of the drawing wire is fixed to the operating handle.

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