Biopsy forceps

Abstract

The embodiment of the utility model discloses biopsy forceps. The biopsy forceps comprise: a forceps head assembly; the handle assembly comprises a handle and a sliding piece, the sliding piece is arranged on the handle in a sliding mode, a clamping part is arranged on the sliding piece, a matching part is arranged on the handle, and the clamping part and the matching part are connected in a clamping mode to lock the sliding piece; the catheter assembly comprises a push-pull piece, and the two ends of the push-pull piece are connected with the forceps head assembly and the sliding piece respectively; when the sliding piece slides along the handle, the sliding piece drives the push-pull piece to open or close the tong head assembly, and when the sliding piece slides to enable the clamping portion and the matching portion to be connected in a clamped mode, the tong head assembly is locked in the closed state. The biopsy forceps can effectively control clamping and loosening of the forceps head assembly and prevent a sample from falling off.

Description

Technical Field

[0001] The embodiment of the utility model relates to the field of medical instruments, and in particular to a biopsy forceps. Background Art

[0002] Biopsy forceps are an indispensable tool for obtaining pathological samples during endoscopic examination. After the biopsy forceps clamp the sample, the operator needs to keep the biopsy forceps in a closed state to ensure that the sample can be removed smoothly. However, most of the biopsy forceps currently do not have a fixed structure, which can easily cause the forceps to loosen when the forceps are withdrawn, causing the sample to fall off, affecting the sampling success rate and prolonging the sampling time. Utility Model Content

[0003] The embodiment of the utility model provides a biopsy forceps, which can effectively control the clamping and loosening of the forceps head assembly to prevent the sample from falling off.

[0004] The utility model provides a biopsy forceps, comprising a forceps head assembly; a handle assembly, comprising a handle and a sliding member, the sliding member is slidably arranged on the handle, the sliding member is provided with a clamping portion, the handle is provided with a matching portion, the clamping portion and the matching portion are clamped with each other to lock the sliding member; a catheter assembly, comprising a push-pull member, the two ends of the push-pull member are respectively connected to the forceps head assembly and the sliding member; wherein, when the sliding member slides along the handle, it drives the push-pull member to open or close the forceps head assembly, and when the sliding member slides to make the clamping portion and the matching portion clamped, the forceps head assembly is locked in a closed state.

[0005] The biopsy forceps of the utility model lock the sliding member by engaging with the engaging portion on the sliding member and the matching portion on the handle, so that the clamp head assembly with the sample clamped can be kept in a closed state, thereby effectively preventing the clamp head assembly from loosening and causing the sample to fall off, and the sampling success rate is high, and the sampling time is also effectively shortened. The clamp head on the sliding member and the matching portion on the handle are directly engaged and locked, which effectively simplifies the structure of the biopsy forceps, does not require additional locking components, and reduces costs. At the same time, locking, unlocking and sampling can be completed with one hand, simplifying the difficulty of operation.

[0006] In a feasible solution, the sliding member is arranged in the handle, the engaging portion is a hook, the matching portion is a first clamping platform, and the sliding member can slide until the hook is engaged with the first clamping platform to lock the sliding member. The mechanical cooperation between the hook and the first clamping platform can stably lock the sliding member to prevent the sliding member from shaking and causing the clamp head assembly to loosen.

[0007] In a feasible solution, the sliding member is provided with two hooks, the two hooks are arranged axially symmetrically about the center line of the sliding member, the first clamping platform is provided with a first through hole penetrating the first clamping platform, and the sliding member can slide until the two hooks pass through the first through hole to engage with the first clamping platform. The locking stability of the sliding member can be further improved by the two hooks cooperating with the first clamping platform.

[0008] In a feasible solution, the handle assembly further includes a first spring, which is disposed between the sliding member and the first clamping platform. When the hook is engaged with the first clamping platform, the first spring is in a compressed state and abuts between the sliding member and the first clamping platform. When the hook is disengaged from the first clamping platform, the sliding member rebounds under the action of the first spring, and the clamp head assembly is in a natural state. At this time, the operator can further move the sliding member to open the clamp head assembly for convenient sampling.

[0009] In a feasible solution, the handle assembly further includes an unlocking mechanism slidably disposed in the handle, and the unlocking mechanism slides to push the hook to disengage from the first card platform to unlock the sliding member. The hook is disengaged from the first card platform by the unlocking mechanism, and the unlocking can be operated with one hand, which is convenient to operate.

[0010] In a feasible solution, the unlocking mechanism includes a movable plug slidably disposed in the handle, and a recessed portion is disposed on one end surface of the movable plug facing the hook, and the inner wall of the recessed portion has a sloped surface inclined toward the center thereof, and the movable plug can slide to make the sloped surface squeeze the hook to deviate toward the center line of the sliding member to disengage from the first clamping station. The recessed portion of the movable plug squeezes the hook to disengage from the first clamping station, and the unlocking process is stable and reliable.

[0011] In a feasible solution, a second clamping plate is further provided in the handle, and the movable plug includes a main body, a pressing portion and an unlocking portion respectively connected to the two ends of the main body, and a limiting column connected to the unlocking portion, the main body and the limiting column are both slidably connected to the second clamping plate, the recessed portion is provided in the unlocking portion, the unlocking portion slides between the first clamping plate and the second clamping plate, and the unlocking mechanism also includes a second spring provided between the second clamping plate and the limiting column. When the operator presses the pressing portion of the movable plug, the movable plug as a whole will slide toward the sliding member, so that the recessed portion on the unlocking portion of the movable plug squeezes the hook on the sliding member to achieve unlocking. In this process, due to the design of the limiting column, the movable plug will not completely detach from the second clamping plate, wherein the second spring is in a compressed state; after unlocking is completed, the movable plug automatically resets under the action of the second spring, and the operation is convenient.

[0012] In a feasible solution, the sliding member includes a fixed portion slidably connected to the handle and a sleeve connected to the fixed portion, the sleeve is slidably sleeved outside the handle, the clamping portion is a protrusion or groove provided on the inner wall of the sleeve, and the matching portion is a groove or protrusion provided on the outer wall of the handle. The mechanical matching of the protrusion and the groove can stably lock the sliding member to prevent the sliding member from shaking and causing the pliers head assembly to loosen.

[0013] In a feasible solution, the fixing part includes a connecting plate and two engaging parts respectively connected to two sides of the connecting plate, the handle is provided with two opposite openings, the sleeve is provided with two opposite engaging holes, and the two engaging parts of the fixing part respectively pass through the corresponding openings of the handle to engage with the corresponding engaging holes of the sleeve. In this way, when the sleeve is pushed to move relative to the handle, the fixing part can be driven to move through the engaging part, thereby driving the pliers head assembly to open or close.

[0014] In a feasible solution, the sleeve is provided with a plurality of protrusions arranged at intervals along the circumference of the inner wall of the sleeve, and the handle is provided with a plurality of annular grooves arranged at intervals along the axial direction of the outer wall of the handle, and the plurality of protrusions can be engaged with any of the plurality of annular grooves. The design of the plurality of annular grooves allows the plurality of protrusions to be positioned at different axial positions as required, thereby adjusting the tightness of the pliers head assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 The figure is a schematic diagram of the overall structure of the biopsy forceps in the first embodiment of the present utility model;

[0017] Figure 2 for Figure 1 Exploded view of the biopsy forceps shown;

[0018] Figure 3 for Figure 1 A cross-sectional view of the handle assembly of the biopsy forceps;

[0019] Figure 4 for Figure 1 Another cross-sectional view of the handle assembly of the biopsy forceps;

[0020] Figure 5The figure is a schematic diagram of the overall structure of the handle assembly of the biopsy forceps in the second embodiment of the present utility model;

[0021] Figure 6 for Figure 5 an exploded view of the handle assembly shown;

[0022] Figure 7 for Figure 5 A cross-sectional view of the handle assembly is shown. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The technical solution of the present utility model is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0026] refer to Figures 1 to 3The biopsy forceps 1000 of the first embodiment of the present utility model comprises a forceps head assembly 1100 , a handle assembly 1200 , and a catheter assembly 1300 for connecting the forceps head assembly 1100 and the handle assembly 1200 .

[0027] The pliers head assembly 1100 includes an openable and closable pliers head 1110 and a support 1120 connected to the pliers head 1110 .

[0028] The handle assembly 1200 includes a handle 1210 and a sliding member 1220. The handle 1210 has a cavity 1211 and a matching portion 1212 disposed in the cavity 1211. The sliding member 1220 can be slidably received in the cavity 1211 of the handle 1210. The sliding member 1220 is provided with a clamping portion 1221, which can be mutually clamped with the matching portion 1212 to lock the sliding member 1220 (such as Figure 3 shown).

[0029] The catheter assembly 1300 includes a push-pull member 1310 and an outer tube 1320 sleeved outside the push-pull member 1310. The two ends of the push-pull member 1310 are respectively connected to the clamp head 1110 and the sliding member 1220. The two ends of the outer tube 1320 are respectively connected to the support 1120 and the handle 1210.

[0030] When the sliding member 1220 slides relative to the handle 1210, the sliding member 1220 drives the push-pull member 1310 to open or close the clamp head 1110, and when the sliding member 1220 slides to make the clamping portion 1221 clamp with the matching portion 1212, the clamp head 1110 is locked in a closed state. This can effectively prevent the clamp head 1110 from loosening and causing the sample to fall off, increase the sampling success rate, and effectively shorten the sampling time.

[0031] In this embodiment, the pliers 1110 of the pliers assembly 1100 includes a first link mechanism and a second link mechanism. The first link mechanism includes a first link 1113 hinged to the push-pull member 1310, a first swing rod 1115 hinged to the first link 1113, and a first clamping portion 1117 connected to the first swing rod 1115. The first swing rod 1115 and the first clamping portion 1117 can be integrally formed, for example.

[0032] Similarly, the second link mechanism includes a second link 1114 hinged to the push-pull member 1310, a second swing rod 1116 hinged to the second link 1114, and a second clamping portion 1118 connected to the second swing rod 1116. The second swing rod 1116 and the second clamping portion 1118 can be integrally formed, for example. The second swing rod 1116 is connected to the first swing rod 1115 via a rotating shaft 1119. The second clamping portion 1118 is opposite to the first clamping portion 1117.

[0033] like Figure 2 As shown, the support 1120 of the clamp head assembly 1100 includes a U-shaped main body 1121 and a connecting portion 1122 connected to the bottom of the U-shaped main body 1121. The U-shaped main body 1121 is provided with a connecting hole 1123 for connecting with the rotating shaft 1119. The connecting portion 1122 is used to connect with the outer tube 1320.

[0034] Therefore, when the sliding member 1220 is pushed to move toward the clamp head assembly 1100, the push-pull member 1310 connected to the sliding member 1220 will move forward relative to the outer tube 1320, thereby driving the first connecting rod mechanism and the second connecting rod mechanism to swing. During this process, the first clamping portion 1117 and the second clamping portion 1118 move away from each other, that is, the clamp head 1110 is opened, and sampling can be carried out at this time.

[0035] When the sliding member 1220 is pulled to move away from the clamp head assembly 1100, the push-pull member 1310 connected to the sliding member 1220 will move backward relative to the outer tube 1320, thereby driving the first connecting rod mechanism and the second connecting rod mechanism to swing. During this process, the first clamping portion 1117 and the second clamping portion 1118 approach each other, that is, the clamp head 1110 is closed, and the sample can be clamped at this time.

[0036] It is understandable that the structure of the clamp head assembly 1100 is only shown as an example and is not intended to limit the present application. A person skilled in the art may also adopt a clamp head assembly with other structures, which will not be described in detail here.

[0037] In this embodiment, the push-pull member 1310 of the catheter assembly 1300 is (but not limited to) a steel cable. In order to increase the connection area between the push-pull member 1310 and the clamp head 1110, preferably, the push-pull member 1310 is connected to the clamp head 1110 (specifically, the first connecting rod 1113 and the second connecting rod 1114) through a first sleeve 1311. It is also preferred that the push-pull member 1310 is connected to the sliding member 1220 through a second sleeve 1312 to ensure that the push-pull member 1310 will not bend when the sliding member 1220 is pushed forward. Optionally, a first connecting tube 1313 can be sleeved on the end of the second sleeve 1312 connected to the sliding member 1220 to facilitate the connection of the second sleeve 1312.

[0038] In this embodiment, the outer tube 1320 of the catheter assembly 1300 is configured as a spring tube to increase the flexibility and flexibility of the outer tube 1320. Similarly, to facilitate the connection between the outer tube 1320 and the handle 1210, one end of the outer tube 1320 is connected to the handle 1210 through a second connecting tube 1321.

[0039] Combined with Figures 2 to 4 In this embodiment, the handle 1210 of the handle assembly 1200 is generally cylindrical in shape, and its diameter is configured to allow the operator to operate it with one hand. The front section of the handle 1210 is provided with a receiving groove 1213 for receiving the second connecting tube 1321. The middle section of the handle 1210 is provided with a groove 1214 and a first opening 1215. In one embodiment, the groove 1214 is recessed from the outer surface of the handle 1210. The first opening 1215 penetrates the side wall of the handle 1210 and connects the groove 1214 with the cavity 1211. The matching portion 1212 is provided at the tail section of the handle 1210, that is, at the end away from the pliers head assembly 1100.

[0040] In this embodiment, the matching portion 1212 is configured as a first card platform.

[0041] More specifically, the first clamping platform is annular and has a first through hole 1216 located in the middle thereof. The clamping portion 1221 moves toward the end away from the clamp head assembly 1100 until it passes through the first through hole 1216 and then engages with the first clamping platform.

[0042] like Figure 2 As shown, in this embodiment, the sliding member 1220 of the handle assembly 1200 includes a base 1222, a connecting plate 1223 vertically connected to one side of the base 1222, a sliding button 1224 connected to the connecting plate 1223, and a connecting strip 1225 vertically connected to the other side of the base 1222. The clamping portion 1221 is connected to the end of the connecting strip 1225.

[0043] The connecting plate 1223 is provided with a lateral groove 1226 for receiving the first connecting tube 1313 to fix the first connecting tube 1313 to the push-pull member 1310 .

[0044] In one embodiment, if Figure 2 and Figure 4 As shown, the slide button 1224 includes a force-applying portion 1227 and an inserting portion 1228, and preferably the force-applying portion 1227 and the inserting portion 1228 are arranged perpendicular to each other. The force-applying portion 1227 is slidably connected to the groove 1214 of the handle 1210. The inserting portion 1228 passes through the first opening 1215 and is connected to the connecting plate 1223. The operator can push the force-applying portion 1227 to make the slide button 1224 slide along the groove 1214 as a whole to push the sliding member 1220 to move.

[0045] In this embodiment, the engaging portion 1221 is a hook. The sliding member 1220 can slide until the hook passes through the first through hole 1216 on the first engaging platform (i.e., the matching portion 1212) of the handle 1210 and engages with the first engaging platform (i.e., Figure 3 As shown in the figure, the sliding member 1220 is locked. Preferably, the sliding member 1220 includes two opposite connecting strips 1225, and correspondingly, also includes two clamping parts 1221. Preferably, the two clamping parts 1221 (hooks) are arranged axially symmetrically about the center line of the sliding member 1220. By engaging the two clamping parts 1221 with the first clamping platform, the locking stability of the sliding member 1220 can be improved.

[0046] It can be understood that in other embodiments, the sliding member 1220 may also include only one clamping portion 1221, and the matching portion 1212 may not be an annular first clamping platform, for example, a semicircular or arc-shaped clamping platform is also feasible.

[0047] In this embodiment, the handle assembly 1200 further includes a first spring 1230. The first spring 1230 is sleeved outside the two connecting strips 1225 and is located between the base 1222 of the sliding member 1220 and the first clamping platform (i.e., the matching portion 1212). When the clamping portion 1221 is engaged with the matching portion 1212, the first spring 1230 is in a compressed state and abuts between the base 1222 and the matching portion 1212. When the clamping portion 1221 is disengaged from the matching portion 1212, the sliding member 1220 rebounds under the action of the first spring 1230, and the clamp head 1110 is in a natural state. At this time, the operator can further move the sliding member 1220 to open the clamp head 1110 to obtain the sample.

[0048] In order to better limit the first spring 1230, preferably, as Figure 2As shown, the sliding member 1220 further includes two limiting bars 1229 connected to the base 1222. Preferably, the limiting bars 1229 are perpendicular to the base 1222. The two limiting bars 1229 are respectively located on both sides of the two connecting bars 1225 and are spaced apart from the corresponding connecting bars 1225. The first spring 1230 is arranged between the two connecting bars 1225 and the two limiting bars 1229, which is stable and reliable. In other embodiments, the limiting bar 1229 can also be set to other structures, such as an annular sleeve structure.

[0049] In this embodiment, the disengagement of the clamping portion 1221 from the matching portion 1212 is achieved by an unlocking mechanism 1240. The unlocking mechanism 1240 is slidably disposed in the handle 1210, and is adapted to slide to push the clamping portion 1221 to disengage from the matching portion 1212 to unlock the sliding member 1220.

[0050] Specifically, the unlocking mechanism 1240 includes a movable plug 1241 slidably disposed in the handle 1210, and a second spring 1242 disposed between the handle 1210 and the movable plug 1241. The movable plug 1241 is provided with a recessed portion 1243 on one end surface facing the matching portion 1212 (also facing the clamping portion 1221), and the recessed portion 1243 has a sloped surface 1244 inclined toward its center. The movable plug 1241 can slide until the sloped surface 1244 squeezes the clamping portion 1221 toward the center line of the sliding member 1220 to disengage from the clamping portion 1221 (first clamping platform). In other words, the connecting strip 1225 is not completely rigid, and at least a portion of its section (such as the section connected to the hook) has a certain degree of deformation capability.

[0051] More specifically, in this embodiment, the handle 1210 is further provided with a second clamping platform 1217 and a second opening 1218 at the tail end. The second clamping platform 1217 is located between the second opening 1218 and the first clamping platform and is spaced apart from each other. The second clamping platform 1217 is provided with a second through hole 1219A located in the middle and two third through holes 1219B located on both sides of the second through hole 1219A.

[0052] The movable plug 1241 includes a columnar body 1245, a pressing portion 1246 and an unlocking portion 1247 respectively connected to both ends of the columnar body 1245, and two limiting columns 1248 connected to the unlocking portion 1247 and respectively located on both sides of the columnar body 1245. The columnar body 1245 is slidably connected to the second through hole 1219A of the second clamping platform 1217. The pressing portion 1246 can be received in the second opening 1218 of the handle 1210. The unlocking portion 1247 is located between the first clamping platform and the second clamping platform 1217, and the recessed portion 1243 is provided on a side of the unlocking portion 1247 facing the first clamping platform. The two limiting columns 1248 are respectively slidably connected to the corresponding third through holes 1219B of the second clamping platform 1217, and each limiting column 1248 is sleeved with a second spring 1242, one end of the second spring 1242 abuts against the second clamping platform 1217, and the other end abuts against the boss at the end of the limiting column 1248.

[0053] When the operator presses the pressing portion 1246 of the movable plug 1241, the movable plug 1241 as a whole will slide toward the first clamping platform, so that the recessed portion 1243 on the unlocking portion 1247 squeezes the clamping portion 1221 on the sliding member 1220 to achieve unlocking. During this process, due to the design of the boss at the end of the limiting column 1248, the movable plug 1241 will not completely separate from the second clamping platform 1217, and the second spring 1242 is in a compressed state. When unlocking is completed, the movable plug 1241 automatically resets under the action of the second spring 1242, which is easy to operate.

[0054] It is understandable that the unlocking mechanism 1240 is shown as an example only. In other embodiments, those skilled in the art may modify the unlocking mechanism 1240. For example, the second clamping platform 1217 may not be designed, and the movable plug 1241 may not be designed with the limiting column 1248, and a spring may be directly arranged between the unlocking portion 1247 of the movable plug 1241 and the first clamping platform. When the movable plug constructed in this way is squeezed to unlock the sliding member 1220, the spring is compressed; after unlocking, the movable plug is reset under the action of the spring.

[0055] refer to Figures 5 to 7The similarities between the biopsy forceps of the second embodiment of the utility model and the biopsy forceps 1000 of the first embodiment are mainly that: the biopsy forceps of this embodiment also include a forceps head assembly 1100 (not shown), a handle assembly 2200 and a catheter assembly 1300 (not shown); the handle assembly 2200 also includes a handle 2210 and a sliding member 2220, and the sliding member 2220 is slidably arranged on the handle 2210; the sliding member 2220 is also provided with a clamping portion 2221, and the handle 2210 is also provided with a matching portion 2212, and the sliding member 2220 can also slide relative to the handle 2210 to drive the push-pull member 1310 to open or close the forceps head assembly 1100, and when the sliding member 2220 slides to make the clamping portion 2221 and the matching portion 2212 clamped, the forceps head assembly 1100 is also locked in a closed state.

[0056] However, the handle assembly 2200 of the present embodiment no longer includes the first spring 1230 and the unlocking mechanism 1240 , and the structure and connection relationship between the handle 2210 and the sliding member 2220 of the handle assembly 2200 of the present embodiment are also changed.

[0057] Specifically, the sliding member 2220 of this embodiment includes a fixing portion 2225 slidably connected to the handle 2210 and a sleeve 2222 connected to the fixing portion 2225. The fixing portion 2225 is used to be fixedly connected to the push-pull member 1310. The sleeve 2222 is slidably sleeved outside the handle 2210. The clamping portion 2221 is a protrusion provided on the inner wall of the sleeve 2222, and the matching portion 2212 is a groove provided on the outer wall of the handle 2210. When the sleeve 2222 moves relative to the handle 2210, the fixing portion 2225 is driven to move, so that the push-pull member 1310 connected to the fixing portion 2225 drives the clamp head assembly 1100 to open or close. The sliding member 2220 can also be stably locked by the clamping fit of the protrusion and the groove, thereby keeping the clamp head 1110 of the clamp head assembly 1100 in a closed state to prevent the sample from falling off.

[0058] Preferably, the clamping portion 2221 includes a plurality of protrusions arranged at intervals along the circumferential direction of the inner wall of the sleeve 2222, and the matching portion 2212 includes a plurality of annular grooves arranged at intervals along the axial direction of the outer wall of the handle 2210, and the plurality of protrusions can be clamped into any of the plurality of annular grooves. Thus, the clamping portion 2221 can be positioned at different axial positions as required, so as to adjust the tightness of the pliers head 1110 of the pliers head assembly 1100.

[0059] It can be understood that in other embodiments, the clamping portion 2221 can also be a groove provided on the inner wall of the sleeve 2222, and the matching portion 2212 can also be a protrusion provided on the outer wall of the handle 2210, and the sliding member 2220 can also be locked by matching the protrusion and the groove.

[0060] More specifically, in this embodiment, the handle 2210 is generally cylindrical, and a receiving groove 1213 is also provided at the front section thereof for receiving the second connecting tube 1321 to be fixedly connected to the outer tube 1320. The middle portion of the handle 2210 is provided with two opposite long strip openings 2215 penetrating through the side wall thereof, and the openings 2215 are communicated with the cavity 2211 of the handle 2210. The matching portion 2212, i.e., a plurality of annular grooves, is provided at the tail section of the handle 2210. Optionally, an end cap 2217 is further provided at the tail end of the handle 2210 for sealing the cavity 2211 of the handle 2210.

[0061] The fixing portion 2225 includes a connecting plate 2223 and two engaging portions 2224 respectively connected to both sides of the connecting plate 2223. A groove 2226 is provided on the connecting plate 2223 for receiving the first connecting tube 1313 to fix the push-pull member 1310. Two opposite engaging holes 2227 are provided on the sleeve 2222. The two engaging portions 2224 of the fixing portion 2225 respectively pass through the corresponding openings 2215 of the handle 2210 and are engaged in the corresponding engaging holes 2227 of the sleeve 2222, so that when the sleeve 2222 is pushed to move relative to the handle 2210, the fixing portion 2225 can be driven to move through the engaging portions 2224, thereby driving the pliers head assembly 1100 to open or close.

[0062] A step portion 2228 is provided between the connecting plate 2223 and the engaging portion 2224, and the width of the step portion 2228 along the radial direction of the handle 2210 is greater than the inner diameter of the handle 2210 and smaller than the outer diameter thereof. Thus, when the fixing portion 2225 moves toward the end cover 2217, the step portion 2228 abuts against the wall of the opening 2215 on the handle 2210 to limit the fixing portion 2225, thereby preventing the fixing portion 2225 from excessively moving.

[0063] Therefore, when the operator slides the sleeve 2222 relative to the handle 2210, the fixing part 2225 also slides along with the sleeve 2222, thereby driving the push-pull member 1310 to open or close the pliers head 1110 of the pliers head assembly 1100. In this embodiment, the cooperation between the handle 2210 and the sliding member 2220 can realize stepless control of the opening angle of the pliers head, and the pliers head can be opened to any angle as required and locked at the same time.

[0064] In the present invention, unless otherwise clearly specified and limited, a first feature being “on” or “under” a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact via an intermediate medium.

[0065] Moreover, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. 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 utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A biopsy forceps, characterized in that: include Clamp head assembly; A handle assembly, comprising a handle and a sliding member, wherein the sliding member is slidably arranged on the handle, the sliding member is provided with a clamping portion, the handle is provided with a matching portion, the clamping portion and the matching portion are mutually clamped to lock the sliding member; The catheter assembly comprises a push-pull member, and two ends of the push-pull member are respectively connected to the clamp head assembly and the sliding member; When the sliding member slides along the handle, it drives the push-pull member to open or close the pliers head assembly. When the sliding member slides until the engaging portion is engaged with the matching portion, the pliers head assembly is locked in a closed state.

2. The biopsy forceps according to claim 1, characterized in that: The sliding member is arranged in the handle, the engaging portion is a hook, the matching portion is a first clamping platform, and the sliding member can slide until the hook is clamped with the first clamping platform to lock the sliding member.

3. The biopsy forceps according to claim 2, characterized in that: The sliding member is provided with two hooks, and the two hooks are axially symmetrically arranged about the center line of the sliding member. The first card table is provided with a first through hole penetrating the first card table, and the sliding member can slide until the two hooks pass through the first through hole to engage with the first card table.

4. The biopsy forceps according to claim 2, characterized in that: The handle assembly further comprises a first spring disposed between the sliding member and the first clamping platform. When the hook is engaged with the first clamping platform, the first spring is in a compressed state and abuts against between the sliding member and the first clamping platform.

5. The biopsy forceps according to claim 2, characterized in that: The handle assembly further comprises an unlocking mechanism slidably disposed in the handle, and the unlocking mechanism slides to push the hook to disengage from the first card platform to unlock the sliding member.

6. The biopsy forceps according to claim 5, characterized in that: The unlocking mechanism includes a movable plug slidably disposed in the handle, wherein a recess is provided on one end face of the movable plug facing the hook, and an inner wall of the recess has a slope surface inclined toward its center. The movable plug can slide until the slope surface squeezes the hook to deviate toward the center line of the sliding member to disengage from the first card platform.

7. The biopsy forceps according to claim 6, characterized in that: A second clamping platform is also provided in the handle, and the movable plug includes a main body, a pressing part and an unlocking part respectively connected to the two ends of the main body, and a limiting column connected to the unlocking part. The main body and the limiting column are both slidably connected to the second clamping platform, the recessed part is provided in the unlocking part, the unlocking part slides between the first clamping platform and the second clamping platform, and the unlocking mechanism also includes a second spring provided between the second clamping platform and the limiting column.

8. The biopsy forceps according to claim 1, characterized in that: The sliding member includes a fixed portion slidably connected to the handle and a sleeve connected to the fixed portion, the sleeve can be slidably mounted outside the handle, the clamping portion is a protrusion or groove provided on the inner wall of the sleeve, and the matching portion is a groove or protrusion provided on the outer wall of the handle.

9. The biopsy forceps according to claim 8, characterized in that: The fixing portion includes a connecting plate and two engaging portions respectively connected to two sides of the connecting plate, the handle is provided with two opposite openings, the sleeve is provided with two opposite engaging holes, and the two engaging portions of the fixing portion respectively pass through the corresponding openings of the handle to engage with the corresponding engaging holes of the sleeve.

10. The biopsy forceps according to claim 8, characterized in that: The sleeve is provided with a plurality of protrusions arranged at intervals in the circumferential direction along the inner wall of the sleeve, and the handle is provided with a plurality of annular grooves arranged at intervals in the axial direction along the outer wall of the handle. The plurality of protrusions can be engaged with any of the plurality of annular grooves.

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