Endoscope biopsy forceps

Abstract

The pair of endoscope biopsy forceps comprises forceps heads and a forceps head seat, the forceps heads are oppositely arranged left and right, the tail ends of the forceps heads are hinged, the forceps head seat is cylindrical, a boss used for installing a cylindrical pin is arranged at the top of the forceps head seat, two shoulders of the boss form a guide edge, a first limiting surface is arranged on the outer side of a supporting arm at the tail of each forceps head, and a second limiting surface is arranged on the outer side of the supporting arm. The tong head is inserted from the top of the tong head seat, and when the first limiting face slides relative to the guide edge, the tong head is closed. The forcep head seat is cylindrical, the limiting surface is arranged outside the forcep head supporting arm, the forcep head can be inserted into the forcep head seat from the opening in the top of the forcep head seat, biopsy forceps do not need to pass through an endoscope forcep channel and are not limited by the forcep channel, the biopsy forceps are suitable for the small-size endoscope forcep channel, and sufficient sampling amount is guaranteed.

Description

Technical Field

[0001] This utility model relates to a medical sampling instrument, and more particularly to an endoscopic biopsy forceps. Background Technology

[0002] Biopsy forceps are used for sampling live tissue. They require a certain length and typically consist of a forceps head assembly, an extension assembly, and an operating handle. The forceps head assembly generally includes at least two forceps, which are opened and closed by the drive handle to perform the grasping action. Biopsy forceps are often used in conjunction with an endoscope. The forceps head passes through the endoscope's forceps channel to reach the lesion site and grasp tissue. The inner diameter of the endoscope's forceps channel matches the outer diameter of the extension assembly. In certain applications, such as ureteral or bile duct strictures, the size of the endoscope's forceps channel will be correspondingly reduced. Due to the limitation of the endoscope's forceps channel inner diameter, the amount of tissue that can be retrieved by the biopsy forceps is limited.

[0003] The utility model patent application with publication number CN 212281447 U discloses a forceps head and biopsy forceps. The tail ends of the left and right forceps heads are hinged and have an arc-shaped groove. The top of the forceps head seat has a rod. There is a pull rod with a sliding groove between the left and right forceps heads. The pull rod is connected to the tail ends of the left and right forceps heads. When the pull rod pushes the left and right forceps heads to move back and forth, the arc-shaped groove of the forceps head slides along the rod, and the left and right forceps heads open or close symmetrically. The sliding groove of the pull rod is used to avoid the rod, which can increase the sample volume. However, the forceps head assembly has many parts and is not easy to assemble. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide an endoscopic biopsy forceps that is compatible with small-sized endoscopic forceps channels.

[0005] Technical solution: The endoscopic biopsy forceps of this utility model include a forceps head and a forceps head base. The forceps head is arranged opposite to each other and is hinged at the tail end. A first limiting surface is provided on the outer side of the support arm at the tail end of the forceps head. The forceps head base is cylindrical and has a boss for installing a cylindrical pin on the top of the forceps head base. The two shoulders of the boss form guide ridges. The forceps head is inserted from the top of the forceps head base. When the first limiting surface slides relative to the guide ridge, the forceps head closes.

[0006] Preferably, the first limiting surface includes two arc-shaped surfaces with opposite centered directions, and the junction of the two arc-shaped surfaces is smoothly transitioned.

[0007] Preferably, the thickness of the support arm gradually decreases from beginning to end.

[0008] Preferably, the inner side of the support arm is provided with an arc-shaped second limiting surface, and a cylindrical pin is provided between the bosses. When the pliers extend, the second limiting surface slides relative to the cylindrical pin, and the pliers are separated by the cylindrical pin. When the pliers close, the cylindrical pin is clamped between the second limiting surfaces.

[0009] Preferably, the side portion of the support arm is cut off to form a first mounting position for another clamp head that is positioned opposite to it.

[0010] Preferably, the tail end of the support arm is thinned and has a fixing hole to form a second mounting position for connecting the flat-head pin.

[0011] Preferably, the two clamp heads arranged opposite each other are driven to move back and forth by a drive wire, and the front end of the drive wire is provided with a connector.

[0012] Preferably, the connector is a flat connector.

[0013] Preferably, the boss is located at the top of the front and rear side walls of the plier head seat, and when the plier head moves back and forth, the inner walls of the front and rear side walls of the plier head seat contact the front and rear sides of the support arm.

[0014] Preferably, the pliers head seat has a connecting end at its tail.

[0015] Preferably, the head of the forceps forms jaws to accommodate tissue, and the edges of the jaws are flat or toothed.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. It is suitable for small-sized endoscope forceps channels; a limiting surface is set on the outside of the forceps head support arm, and the forceps head seat is set as a cylindrical shape. The forceps head can be inserted into the forceps head seat from the top opening. The forceps head part of the biopsy forceps does not need to pass through the endoscope forceps channel. The outer tube can complete the sampling by passing through the forceps channel. It is suitable for small-sized endoscope forceps channels. The size of the forceps head is not limited by the forceps channel. The outer diameter of the forceps head can be more than 2mm, such as 2.3mm, to ensure sufficient sampling volume. 2. Simplified structure and easy assembly: The bottom of the forceps head is hinged, then connected to the drive wire extending into the forceps head seat, and finally the cylindrical pin is installed to complete the assembly; 3. Helps reduce discomfort: The forceps head seat is cylindrical and wraps around the outside of the forceps head, ensuring that the outer wall of the forceps head assembly is smooth. The outer limiting surface of the forceps head is a smooth curved surface, ensuring that the outside of the forceps head is smooth; 4. Ensures the open state of the biopsy forceps: The structural features of the limiting surface of the outer wall of the support arm and the gradually decreasing thickness of the support arm are matched to ensure the opening angle of the jaws, ensure the sample volume of the forceps head, and increase the sampling efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the biopsy forceps structure of this utility model;

[0018] Figure 2 A schematic diagram of the assembly structure of the pliers head and drive wire;

[0019] Figure 3 This is a schematic diagram of the pliers head base structure;

[0020] Figure 4 Schematic diagram of the clamp head structure;

[0021] Figure 5 Schematic diagram of the position driving wire structure;

[0022] Figure 6 This is a front view of the biopsy forceps of this utility model;

[0023] Figure 7 This is a front sectional view of the biopsy forceps of this utility model in the closed state;

[0024] Figure 8 This is a frontal sectional view of the biopsy forceps of this utility model in the open state;

[0025] Figure 9 This is a schematic diagram of the biopsy forceps of this utility model in use. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the biopsy forceps 100 of this utility model mainly consists of a forceps head 1, a forceps head seat 2, and a drive wire 5. The forceps head 1 is symmetrically arranged on the left and right to form grippers for grasping tissue. The forceps head seat 2 supports the forceps head 1, and the drive wire 5 drives the forceps head 1 to extend forward or retract, so that the forceps head 1 can perform opening and closing actions.

[0028] like Figure 2 , Figure 4 The front half of the forceps head 1 is the jaw 13, which is used to accommodate the tissue being grasped. The jaw 13 can be flat or toothed. A pressure relief hole 16 is provided on the side wall of the jaw 13. The rear half of the forceps head 1 is the support arm 15. A guide surface 11 is provided on the outer wall of the support arm 15. The guide surface 11 has two arc-shaped surfaces with opposite centers. The joint is tangent and smoothly transitions. The guide surface 11 cooperates with the forceps head seat 2. The forceps head 11 can be inserted into the forceps head seat 2 from the top opening of the forceps head seat, which is suitable for small-sized endoscope channels. The maximum size of the forceps head after closing can reach 2.3mm. When the forceps head 1 is pulled back, the guide surface 11 causes the forceps head 1 to close. The thickness of the support arm 15 gradually decreases from head to tail to ensure that the opening angle of the forceps head 1 is large enough. The inner wall of the support arm 15 has a guide surface 12, which is arc-shaped. The guide surface 12 cooperates with the forceps head seat 2, allowing the forceps head 1 to open to a certain range when pushed forward. The tail end of the support arm 15 has a fixing hole 14 for connecting the drive wire 5. The thickness of the support arm 15 is reduced at the fixing hole 14 to make room for fasteners such as flat-head pins 7 and baffles 9. A portion of one side of the support arm 15 is cut off to form a mounting position for another forceps head, which is used to accommodate the support arm 15 of another forceps head 1, thereby reducing the space occupied in the width direction of the biopsy forceps.

[0029] like Figure 3 , Figure 7 , Figure 8The plier head base 2 is cylindrical in shape, with an internal guide channel 24. The top of the guide channel 24 is for the plier head 1 to enter, and the bottom is for the drive wire 5 to enter. Both the front and rear sides of the top of the plier head base 2 have bosses 22, and the middle of both the front and rear bosses 22 has positioning holes 221 for installing cylindrical pins 6. The shoulders of the bosses 22 form guide ridges 21. When the plier head 1 moves forward, the closed plier head 1 can be separated by the cylindrical pins 6. The cylindrical pins 6 and guide surfaces 12 cooperate, and the guide surfaces 12 slide along the cylindrical pins 6, allowing the plier head 1 to open and close. When the guide 21 and guide surface 11 are engaged, the jaw 1 closes. Specifically, when the guide 21 and guide surface 11 are engaged, and the guide surface 11 slides along the guide 21, the jaw 1 can close. When the jaw 1 closes, the support arm 15 retracts into the guide channel 24. The inner wall of the boss 22 is a limiting surface 222. When the jaw 1 moves back and forth, the limiting surface 222 contacts the front and rear of the support arm 15. The limiting surface 222 engages with the guide channel 24, allowing the support arm 15 to slide inside the jaw seat 2 without axial deflection.

[0030] The end 23 of the clamp head seat 2 is connected to the drive wire 5 through which to pass. For example... Figure 6 The plier head seat 2 also has a connector 3 and an outer tube 4 at its tail. The connector is used to fix the plier head seat 2 and the outer tube 4. The outer tube 4 is a flexible tube, such as a spring tube, with an outer diameter of 0.7 to 1.1 mm and an internal cavity for the drive wire 5 to pass through.

[0031] like Figure 5 , Figure 7 , Figure 8 The drive wire 5 is a flexible wire with a certain degree of support, such as steel wire rope or nickel-titanium rope. The front end of the drive wire 5 is provided with a connector 8. The front end of the connector 8 is flat and is provided with a connecting hole 81. During assembly, the connector 8 is located between the two support arms 15. The flat-headed pin 7 passes through the fixing hole 14 and the connecting hole 81 to connect the drive wire 5 and the pliers 1. When the drive wire 5 extends forward or retracts backward, it can drive the two pliers 1 to move simultaneously.

[0032] During assembly, after the pliers head 1 is assembled with the flat-head pin 7, the stop plate 9, the connector 8, and the drive screw 5, the assembly is inserted into the guide channel 24 of the pliers head seat 2 from the top. Then, the cylindrical pin 6 is fixed in the positioning hole 221 on the pliers head seat 2 for positioning. The connecting end 23 of the pliers head seat 2 is fixed to one end of the outer tube 4 by the connector 3, such as... Figure 9The other end of the outer tube 4 is connected and fixed to the handle 200, and the other end of the drive wire 2 is also connected to the handle 200. After the biopsy forceps 100 are inverted into the endoscope 300 through the distal forceps channel 3001 and mounted on the handle 200, the handle 200 is operated to push the drive wire 5 forward. The drive wire 5 causes the forceps head 1 to move forward through force transmission. At this time, the guide surface 12 of the forceps head contacts the cylindrical pin 6. Under the limiting action of the cylindrical pin 6, the two symmetrical forceps heads 1 open. After the opened forceps head 1 reaches the lesion position, the handle 200 is operated to move the drive wire 5 backward. The two forceps heads 1 move backward under the action of the drive wire 5. At this time, the guide surface 11 of the forceps head contacts the guide ridge 21 of the forceps head seat 2. Under the limiting action of the guide ridge 21, the two opposing forceps heads 1 close. At this time, the lesion tissue can be grasped and removed from the body for biopsy.

Claims

1. An endoscopic biopsy forceps comprising a forceps head (1) and a forceps head holder (2), the forceps head (1) being arranged opposite to each other and hingedly connected at the tail end, characterized in that, The first limiting surface (11) is arranged outside the supporting arm (15) of the tail of the plier head (1), the plier head seat (2) is cylindrical, the top of the plier head seat (2) is provided with a boss (22) for mounting a cylindrical pin, the two shoulders of the boss (22) form a guide rib (21), the plier head (1) is inserted from the top of the plier head seat (2), when the first limiting surface (11) slides relative to the guide rib (21), the plier head (1) is closed.

2. The endoscopic biopsy forceps according to claim 1, wherein, The first limiting surface (11) comprises two arc surfaces with opposite centers, and the junction of the two arc surfaces is smoothly transitioned.

3. The endoscopic biopsy forceps according to claim 1, wherein, The thickness of the supporting arm (15) gradually decreases from the head to the tail.

4. The endoscopic biopsy forceps according to claim 1, wherein, The inner side of the supporting arm (15) is provided with an arc-shaped second limiting surface (12), the boss (22) is provided with a cylindrical pin (6), when the plier head (1) is extended, the second limiting surface (12) slides relative to the cylindrical pin (6), the plier head (1) is separated by the cylindrical pin (6), when the plier head (1) is closed, the cylindrical pin (6) is clamped between the second limiting surfaces (12).

5. The endoscopic biopsy forceps according to claim 1, wherein, The side surface of the supporting arm (15) is partially cut to form a first mounting position of the other plier head.

6. The endoscopic biopsy forceps according to claim 1, wherein, The tail end of the supporting arm (15) is thinned and provided with a fixing hole (14) to form a second mounting position for connecting a flat pin shaft.

7. The endoscopic biopsy forceps according to claim 1, wherein, The two plier heads (1) arranged opposite to each other are driven to move forward and backward by a driving wire (5), the front end of the driving wire (5) is provided with a joint (8), and the joint (8) is a flat joint.

8. The endoscopic biopsy forceps according to claim 1, wherein, The boss (22) is located at the top of the front and rear side walls of the plier head seat, when the plier head (1) moves forward and backward, the inner walls of the front and rear side walls of the plier head seat (2) are in contact with the front and rear side surfaces of the supporting arm (15).

9. The endoscopic biopsy forceps according to claim 1, wherein, The head of the plier head (1) forms a plier jaw (13) for containing tissues, the edge of the plier jaw (13) is flat or toothed.

10. The endoscopic biopsy forceps according to claim 1, wherein, The tail of the plier head seat (2) is provided with a connecting end (23).

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