Endoscope biopsy forceps

Abstract

The application discloses an endoscope sampling forceps, and relates to the field of medical devices, and has the technical scheme as follows: the endoscope sampling forceps comprises a wire, a handle, a spring tube, a forceps head assembly and a sliding block which is slidably arranged on the handle; the wire is arranged in the handle and the spring tube, and one end of the wire is connected with the sliding block, and the other end of the wire is connected with the forceps head assembly; the forceps head assembly comprises a forceps seat and two forceps heads; one end of the forceps seat is fixedly connected with the spring tube; the forceps head comprises a forceps handle; the forceps handles of the two forceps heads are hingedly connected to the other end of the forceps seat; the forceps handles are arranged on the front and back sides of the forceps seat; the forceps seat is provided with shaft holes for hingedly connecting the forceps handles; the two shaft holes are arranged in parallel; the wire is provided as two wires; and each wire is hingedly connected to the side of each forceps handle, which is away from the hinged position of the forceps handle and the shaft hole. The endoscope sampling forceps has the advantages of simple structure, large clamping force, low production and maintenance cost, high working stability and suitability for sampling in narrow spaces.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, more particularly, it relates to an endoscope biopsy forceps. BACKGROUND

[0002] With the development of medical technology, endoscopic surgery as a new type of surgery has the advantages of small surgical incision and less pain, and is more and more favored by doctors and patients. The biopsy forceps is a necessary tool in clinical endoscopy, which realizes the small trauma and small pain examination process, and is widely used. When the doctor or patient wants to perform pathological examination on the lesion site in the cavity, the biopsy forceps can reach the lesion site through the endoscope channel and clamp the lesion tissue for pathological examination.

[0003] The common biopsy forceps on the market under the endoscope transmits the push-pull force from the handle to the biopsy forceps head through the pull wire, and then controls the opening and closing of the forceps mouth. The existing forceps head structure assembly mainly includes a forceps head, a connecting rod, a push-pull rod, a forceps head seat, etc. Since the push-pull rod is connected to the connecting rod on both sides in a single shaft structure, the size of the force arm is limited when occlusion, and the occlusion force of the forceps head is insufficient, resulting in tearing and bleeding when the forceps head clamps the tissue during the operation, which requires hemostasis treatment, increasing the cost and causing more pain to the patient.

[0004] In view of the above problems, the Chinese invention patent with publication number CN108969026A discloses a medical forceps, and the technical solution points are as follows: a handle, a traction rope, a spring hose, a cup seat, a push-pull rod, a connecting piece and a forceps cup are included. The spring hose is connected with the cup seat, the traction rope is arranged in the spring hose and the cup seat, one end of the traction rope is connected with the handle, the other end of the traction rope is connected with the push-pull rod, the middle parts of the two forceps jaws are hinged through a hinge shaft, and the hinge shaft is installed on the forceps seat. The lower part of the forceps jaw is hinged with one end of the connecting piece, the other end of the connecting piece is hinged with the push-pull rod, the push-pull rod has two hinge centers for being hinged with the two connecting pieces respectively, and the two connecting pieces are arranged in a cross shape.

[0005] Although the above-mentioned method adopts a double-hinge center structure, the forceps jaw, the connecting piece and the push-pull rod form a staggered five-link mechanism, which ensures the flexibility of the forceps and enhances the occlusion force of the forceps, and improves the efficiency and accuracy of the biopsy forceps in clamping the tissue. However, it still has the following disadvantages:

[0006] 1. When the forceps jaw is opened, the connecting piece of the five-link mechanism will also expand outward, which requires a large activity radius, and it is difficult to sample in a small space;

[0007] 2. Since the scissors arm structure principle is adopted in essence, the opening and closing angle between the two forceps is very limited;

[0008] 3. Its clamp head assembly has many parts, resulting in high production costs and low operational stability.

[0009] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0010] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an endoscopic sampling forceps that solves the problems of complex structure, difficulty in sampling in a confined space, and insufficient clamping force of existing endoscopic sampling forceps.

[0011] The above-mentioned technical objective of the present invention is achieved through the following technical solution: an endoscopic sampling forceps, comprising a wire, a handle, a spring tube, a forceps head assembly, and a slider slidably disposed on the handle, wherein the wire passes through the handle and the spring tube, and one end of the wire is connected to the slider and the other end is connected to the forceps head assembly, the forceps head assembly includes a forceps base and two forceps heads, one end of the forceps base is fixedly connected to the spring tube, and each forceps head includes a handle, the handles of the two forceps heads are respectively hinged to the other end of the forceps base, and the two handles are respectively located on the front and rear sides of the forceps base, the forceps base is respectively provided with shaft holes for the two handles to hinge, the two shaft holes are arranged left and right, the wire is provided as two, each wire is hinged to the side of each forceps head away from its hinge position with the shaft hole, when the slider is pushed or pulled, the two forceps heads can rotate around the shaft holes towards or away from each other to drive the two forceps heads to close or open.

[0012] In one embodiment, the clamp seat includes a sleeve fixedly connected to a spring tube and a frame plate extending upward from the middle of the top of the sleeve. The frame plate is flat, and two shaft holes are disposed on the frame plate either through or without penetration. The line connecting the two shaft holes is parallel to the top end face of the clamp seat. Two through slots are symmetrically formed on the sleeve along the frame plate. A rotating shaft and a drive shaft are fixed on the clamp handle, respectively. The clamp handle is hinged to the shaft hole through the rotating shaft, and the wire passes through the through slot and is hinged to the drive shaft.

[0013] In one embodiment, the pliers head further includes jaws, the pliers handle extends downward from the front side of the lower part of the jaws and is L-shaped, the pivot is fixed at the inflection point of the L-shaped pliers handle, the drive shaft is fixed at the end of the L-shaped pliers handle, a short arm extends downward from the rear side of the lower part of the jaws, and an assembly groove is formed between the pliers handle and the short arm. The width of the assembly groove is adapted to the thickness of the frame plate, and at least a portion of the frame plate can extend into and be confined within the assembly groove.

[0014] In one embodiment, the thickness of the clamp at the root of the rotating shaft is greater than the thickness of the clamp at the root of the drive shaft, such that the clamp forms a step between the rotating shaft and the drive shaft, and the height of the drive shaft is lower than the height of the step.

[0015] In one of the embodiments, the handle is provided with a limiting stroke for limiting the sliding of the slider, and when the slider slides within the limiting stroke, the opening and closing angle between the two jaws is 0°-100°.

[0016] In one of the embodiments, the two jaws also have a mechanical disassembly angle, and when the mechanical disassembly angle is within the range, the two jaws can be respectively detached from the jaw seat, and the mechanical disassembly angle is greater than 100° and less than or equal to 180°.

[0017] In one of the embodiments, the wire pulling end close to the driving shaft is bent to form a pull ring, and the pull ring is hinged to the driving shaft.

[0018] In one of the embodiments, the jaw is a hollow arc-shaped thin-walled structure with an opening at one end, the openings of the two jaws are oppositely arranged, and through holes are also provided on the two jaws.

[0019] In one of the embodiments, the relative positions of the handle of one jaw and the short arm of the other jaw are respectively provided with mutually matched arcs.

[0020] In one of the embodiments, the wire pulling is elastic and hard.

[0021] In summary, the present application has the following advantages: the two jaws are respectively hinged to the two shaft holes, and the wire pulling for providing driving force is arranged for each jaw, and when working, the two jaws can be respectively rotated around the shaft holes to realize the opening and closing of the two jaws, and the clamping force of the two jaws is enhanced, and the jaw assembly of the present application only includes a jaw seat and two jaws, has the advantages of simple structure, low production and maintenance cost, and high working stability, and when the two jaws are opened during the working process, the handle position is inwardly retracted, so that the handle position is not outwardly expanded, has a small activity radius, and can be applied to sampling in a narrow space. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the endoscope sampling forceps of the embodiments of the present application;

[0023] Figure 2 It is an exploded view of the jaw assembly in the endoscope sampling forceps of the embodiments of the present application;

[0024] Figure 3 It is a schematic diagram of the jaw opening state in the endoscope sampling forceps of the embodiments of the present application;

[0025] Figure 4 It is a schematic diagram of the jaw closing state in the endoscope sampling forceps of the embodiments of the present application;

[0026] Figure 5 A simplified force analysis diagram of the forceps head in the endoscopic sampling forceps in the embodiment of this application when the forceps head is closed;

[0027] Figure 6 This is a schematic diagram showing the mechanical disassembly angle between the forceps head and the forceps base in an endoscopic sampling forceps according to an embodiment of this application.

[0028] In the diagram: 1. Handle; 2. Bourdon tube; 3. Pliers head assembly; 31. Pliers head; 311. Jaws; 3111. Through hole; 312. Short arm; 313. Assembly slot; 314. Pliers handle; 3141. Stepped; 32. Pliers base; 321. Stand; 3211. Shaft hole; 322. Tube sleeve; 3221. Through groove; 4. Slider; 5. Wire drawing; 51. Pull ring; 6. Rotating shaft; 7. Drive shaft. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] like Figures 1 to 4 As shown, an embodiment of this application provides an endoscopic sampling forceps, including a wire 5, a handle 1, a spring tube 2, a forceps head assembly 3 connected in sequence, and a slider 4 slidably disposed on the handle 1. The wire 5 passes through the handle 1 and the spring tube 2, and one end of the wire 5 is connected to the slider 4. The wire 5 can be hinged to the slider 4 via a connecting post. The slider 4 is a ring. The handle 1 is provided with a groove into which the connecting post can extend. The other end of the wire 5 is connected to the forceps head assembly 3. The forceps head assembly 3 includes a forceps base 32 and two forceps heads 31. One end of the forceps base 32 is fixedly connected to the spring tube 2. The forceps head 31 includes a handle 314. The handles 314 of the two forceps heads 31 are respectively hinged to the other end of the forceps base 32, and the two handles 314 are respectively located on the front and rear sides of the forceps base 32. The forceps base 32 is provided with shaft holes 3211 for the two handles 314 to be hinged, and the two shaft holes 3211 are arranged side by side. The drawing wire 5 is configured as two wires, each wire 5 is hinged to the side of each clamp handle 314 away from its hinge position with the shaft hole 3211. When the slider 4 is pushed or pulled, the two clamp heads 31 can rotate towards or away from each other around the shaft hole 3211 to drive the two clamp heads 31 to close or open.

[0031] Specifically, the wire 5 is an elastic hard wire, which can be steel wire.

[0032] During operation, the slider 4 on the push-pull handle 1 can retract or extend the wire puller 5. The wire puller 5 drives the two clamp heads 31 to rotate in opposite directions around the shaft hole 3211 to drive the two clamp heads 31 to close or open. Specifically, when the slider 4 is pushed, the two clamp heads 31 open, and when the slider 4 is pulled back, the two clamp heads 31 close.

[0033] The above-mentioned mode is achieved by hingedly connecting the two plier heads 31 to the two shaft holes 3211 respectively, and setting a pull wire 5 for providing driving force for each plier head 31. In operation, the two plier heads 31 can rotate around the shaft holes 3211 respectively to open and close the two plier heads 31, thereby enhancing the clamping force of the two plier heads 31. The plier head 31 assembly 3 only includes the plier seat 32 and the two plier heads 31, and has the advantages of simple structure, low production and maintenance cost, and high operation stability. In addition, when the two plier heads 31 are opened, the positions of the plier handles 314 are retracted inward, so that the positions of the plier handles 314 are not expanded outward, and the plier head 31 assembly 3 has a small activity radius and can be used for sampling in a narrow space.

[0034] In the embodiment, the plier seat 32 includes a sleeve 322 fixedly connected with the spring tube 2 and a shelf plate 321 formed by extending upward from the top of the sleeve 322. The shelf plate 321 is arranged in a flat shape, and the two shaft holes 3211 are arranged through or non-through the shelf plate 321. The line connecting the two shaft holes 3211 is parallel to the top end surface of the plier seat 32. Two through grooves 3221 are symmetrically formed in the sleeve 322 along the shelf plate 321. The plier handle 314 is fixed with a rotating shaft 6 and a driving shaft 7 respectively. The plier handle 314 is hingedly connected with the shaft hole 3211 through the rotating shaft 6. The pull wire 5 is hingedly connected with the driving shaft 7 after passing through the through groove 3221.

[0035] Specifically, the sleeve 322 is connected with the spring tube 2 by laser welding. The depth of the shaft hole 3211 is only required to be greater than the length of the rotating shaft 6, so that the plier handle 314 can better fit the shelf plate 321. The through groove 3221 has a certain length and width, and can provide free movement for the pull wire 5.

[0036] Through the arrangement of the through groove 3221, when the plier handle 314 rotates around the rotating shaft 6, the pull wire 5 always moves left and right or up and down within the range of the through groove 3221. Therefore, the activity radius of the pull wire 5 is not too large, which is beneficial to the sampling of the plier head 31 assembly 3 in a narrow space.

[0037] In the embodiment, the thickness of the plier handle 314 at the root of the rotating shaft 6 is greater than the thickness of the plier handle 314 at the root of the driving shaft 7, so that a step 3141 is formed between the plier handle 314 and the driving shaft 7. The height of the driving shaft 7 is lower than the height of the step 3141.

[0038] The arrangement of the above structure makes the driving shaft 7 not contact with the shelf plate 321 when the plier handle 314 rotates around the rotating shaft 6, so that the rotation of the plier handle 314 is not interfered, and the flexibility of the rotation of the plier handle 314 is effectively improved.

[0039] The jaw 31 further comprises a jaw opening 311, the jaw handle 314 is formed by extending downward from the front side of the lower part of the jaw opening 311, and the jaw handle 314 is L-shaped, the rotating shaft 6 is fixed at the inflection point of the L-shaped jaw handle 314, the driving shaft 7 is fixed at the end of the L-shaped jaw handle 314, the lower rear side of the jaw opening 311 is formed with a short arm 312 extending downward, and the assembly groove 313 is formed between the jaw handle 314 and the short arm 312, the width of the assembly groove 313 is adapted to the thickness of the shelf plate 321, and at least part of the shelf plate 321 can extend into and be limited in the assembly groove 313.

[0040] Specifically, when the jaw handle 314 rotates to a certain position, the short arm 312 loses the limiting effect on the shelf plate 321, so that the jaw 31 can be detached from the shelf plate 321.

[0041] In the embodiment, the handle 1 is provided with a limiting stroke for limiting the sliding block 4, and when the sliding block 4 slides in the limiting stroke, the opening and closing angle between the two jaw openings 311 is 0°-100°.

[0042] Specifically, as shown in Figure 5 The opening and closing angle can also be defined in the following manner: the line between the rotating shaft 6 and the driving shaft 7 is set as a, the line between the two shaft holes 3211 is set as b, and the included angle between a and b is set as α. When the jaw 31 is working, the angle α can be-5° to 45°, and at this time, the opening and closing angle between the two jaw openings 311 is 0°-100°.

[0043] The above-mentioned manner makes the two jaw openings 311 have a larger opening and closing angle within the formed range, and has better applicability.

[0044] Figure 5 When the jaw 31 is closed, the wire drawing 5 pulls the driving shaft 7 downward to generate a downward component force Fa acting on the force arm a. The force arm a of the four-bar linkage sampling force is longer, the component force Fa is larger, and the generated torque is larger, so that a larger force F is generated on the jaw opening 311 through the rotating shaft 6, and a strong bite is generated with the other jaw opening 311.

[0045] In the embodiment, the two jaw openings 311 also have a mechanical disassembly angle, and when the two jaw openings 311 are within the mechanical disassembly angle range, the two jaw openings 311 can be respectively detached from the jaw seat 32, and the mechanical disassembly angle is greater than 100° and less than or equal to 180°.

[0046] Specifically, as shown in Figure 6As shown, the mechanical dismounting angle can also be defined in the following form, assuming that the mechanical dismounting angle is α0, when the angle is α0, the short arm 312 loses the limiting effect on the shelf plate 321, so that the jaw 31 can be dismounted from the shelf plate 321, in the implementation process, the distance between the shaft 6 and the short arm 312 is greater than the minimum distance between the shaft hole 3211 and the side wall of the shelf plate 321 adjacent to it, which can achieve the above purpose.

[0047] It should be noted that the mechanical dismounting angle can only be reached when the jaw 31 is manually pressed down, and the mechanical dismounting angle cannot be reached when the slider 4 is pushed and pulled within the stroke, so that the jaw 31 will not fall off the jaw seat 32 during normal operation.

[0048] The above structure makes the jaw 31 assembly 3 have the advantages of convenient and fast dismounting, which is beneficial to subsequent replacement or cleaning.

[0049] In this embodiment, the wire drawing 5 is bent to form a pull ring 51 at one end close to the driving shaft 7, and the pull ring 51 is hinged to the driving shaft 7.

[0050] The above structure has a movement gap between the pull ring 51 and the driving shaft 7, which makes the movement between the pull ring 51 and the driving shaft 7 more smooth.

[0051] In this embodiment, the jaw 311 is a hollow arc-shaped thin-walled structure with an opening at one end, and the openings of the two jaw 311s are oppositely arranged, and through holes 3111 are also arranged through the two jaw 311s.

[0052] In the above manner, by arranging the jaw 311 as a hollow arc-shaped thin-walled structure, it has the advantages of light weight and high structural strength, and by arranging the through hole 3111, when the two jaws 311 are closed, the gas between them can be discharged through the through hole 3111, which is beneficial to improve the tightness of the clamping.

[0053] In this embodiment, the relative positions of the jaw handle 314 of one jaw 31 and the short arm 312 of the other jaw 31 are respectively arranged with mutually matched arcs. By arranging the mutually matched arcs, when the two jaws 31 move towards or away from each other, the bottoms between them can be arc-shapedly fitted, which is beneficial to maintain the stability of the two jaws 31.

[0054] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiment. Any technical solution that belongs to the idea of the present application shall be within the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the present application shall also be considered as the protection scope of the present application.

Claims

1. An endoscopic sampling forceps, comprising a wire (5), a handle (1), a spring tube (2), a forceps head assembly (3) connected in sequence, and a slider (4) slidably disposed on the handle (1), wherein the wire (5) passes through the handle (1) and the spring tube (2), and one end of the wire (5) is connected to the slider (4), and the other end is connected to the forceps head assembly (3), characterized in that: The pliers assembly (3) includes a pliers base (32) and two pliers (31). One end of the pliers base (32) is fixedly connected to the spring tube (2). Each pliers (31) includes a pliers handle (314). The pliers handle (314) of the two pliers (31) are respectively hinged to the other end of the pliers base (32), and the two pliers handle (314) are respectively located on the front and rear sides of the pliers base (32). The pliers base (32) is provided with shaft holes (3211) for hinged connection of the two pliers handle (314). The two shaft holes (3211) are arranged side by side, and the two pliers are respectively hinged to the two shaft holes. Next, the drawing wire (5) is configured as two wires, each wire (5) is hinged to each clamp handle (314) on the side away from its hinge position with the shaft hole (3211). When the slider (4) is pushed or pulled, the two clamp heads (31) can rotate towards or away from each other around the shaft hole (3211) to drive the two clamp heads (31) to close or open. The clamp seat (32) includes a sleeve (322) fixedly connected to the spring tube (2) and a frame plate (321) extending upward from the middle of the top of the sleeve (322). The frame plate (321) is configured as flat, and the two shaft holes (3211) pass through it. The clamps are mounted on the frame plate (321) either through or without penetration. The line connecting the two shaft holes (3211) is parallel to the top end face of the clamp seat (32). Two through slots (3221) are symmetrically opened on the sleeve (322) along the frame plate (321). A rotating shaft (6) and a drive shaft (7) are fixed on the clamp handle (314). The clamp handle (314) is hinged to the shaft hole (3211) through the rotating shaft (6). The wire (5) passes through the through slot (3221) and is hinged to the drive shaft (7). The clamp head (31) also includes jaws (311). The clamp handle (314) The jaws (311) extend downward from the front side of the lower part, and the handle (314) is L-shaped. The pivot (6) is fixed at the inflection point of the L-shaped handle (314), and the drive shaft (7) is fixed at the end of the L-shaped handle (314). A short arm (312) extends downward from the rear side of the lower part of the jaws (311). An assembly groove (313) is formed between the handle (314) and the short arm (312). The width of the assembly groove (313) is adapted to the thickness of the frame plate (321). At least a portion of the frame plate (321) can extend into and be confined within the assembly groove (313). During operation, when the two pliers open, the pliers handles will retract inwards, preventing them from expanding outwards.

2. The endoscopic sampling forceps according to claim 1, characterized in that: The thickness of the clamp (314) at the root of the rotating shaft (6) is greater than the thickness of the clamp (314) at the root of the drive shaft (7), so that the clamp (314) forms a step (3141) between the rotating shaft (6) and the drive shaft (7), and the height of the drive shaft (7) is lower than the height of the step (3141).

3. The endoscopic sampling forceps according to claim 1, characterized in that: The handle (1) is provided with a limiting stroke for limiting the slider (4). When the slider (4) slides within the limiting stroke, the opening angle between the two jaws (311) is 0°-100°.

4. The endoscopic sampling forceps according to claim 3, characterized in that: The two jaws (311) also have a mechanical disassembly angle. Within the range of the mechanical disassembly angle, the two jaws (31) can be removed from the jaw base (32) respectively. The mechanical disassembly angle is greater than 100° and less than or equal to 180°.

5. The endoscopic sampling forceps according to claim 1, characterized in that: The end of the wire (5) near the drive shaft (7) is bent to form a pull ring (51), which is hinged to the drive shaft (7).

6. The endoscopic sampling forceps according to claim 1, characterized in that: The jaws (311) are hollow, arc-shaped, thin-walled structures with an opening at one end. The openings of the two jaws (311) are arranged facing each other, and through holes (3111) are also provided through the two jaws (311).

7. The endoscopic sampling forceps according to claim 1, characterized in that: The relative positions of the handle (314) of one of the pliers (31) and the short arm (312) of the other pliers (31) are respectively provided with mutually compatible arcs.

8. The endoscopic sampling forceps according to claim 1, characterized in that: The wire drawing (5) is an elastic hard wire drawing.

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