CN210077720U - Biopsy Forceps and Biopsy Systems - Google Patents

Abstract

The utility model provides a biopsy forceps and biopsy system. The handle of the biopsy forceps is connected with the near end of the elastic tube, the forceps head component is connected with the far end of the elastic tube, the core wire component is movably arranged in the elastic tube in a penetrating mode, the sliding component is connected with the near end of the core wire component, and the forceps head component is connected with the far end of the core wire component; the elastic pipe comprises a pre-bending section adjacent to the tong head assembly and straight sections respectively connected with two ends of the pre-bending section, and the pre-bending section keeps an initial pre-bending angle in a natural state; the binding clip assembly comprises two binding clips which are oppositely opened and closed; the sliding assembly moves towards the near end of the handheld assembly so that the core wire assembly drives the bending angle of the pre-bending section to change from the initial pre-bending angle to 0 degree, and the two forceps heads are closed; the sliding assembly is moved distally of the handle assembly to spread the two jaws apart. The utility model provides a bending angle can not be adjusted according to individual tissue structure's difference to the preflex portion of biopsy forceps, the relatively poor technical problem of suitability of biopsy forceps.

Description

Biopsy Forceps and Biopsy Systems

technical field

The utility model relates to the technical field of medical instruments, in particular to a biopsy forceps and a biopsy system.

Background technique

Bronchoscopy, gastroscope, colonoscopy and other endoscopes can visually observe the lesions in the lungs, stomach and other organs, and endoscopy is currently a commonly used clinical examination method. In the process of endoscopy, doctors often use biopsy forceps, or biopsy forceps for short, to perform biopsy: biopsy forceps directly reach the patient's body through the endoscope forceps, and take out a certain amount from the patient's body by incision, forceps or puncture. Pathological examination was performed on a large amount of diseased tissue to make a definite histopathological diagnosis. This inspection method is the most convenient and efficient way to obtain pathological diagnosis of diseased tissue in the human body. Therefore, biopsy forceps are widely used in clinical endoscopy.

Existing biopsy forceps generally include a pre-curved portion with a specific curvature and a bending angle, and the pre-curved portion will become straight when passing through the endoscope channel or delivery sheath, and once the forceps channel or delivery sheath is extended. When the pre-bending portion is restored to a curved state, the pre-bending portion can be entered into a lumen that matches or is relatively close to the shape of the pre-bending portion for biopsy. Therefore, this kind of biopsy forceps can only perform biopsy on a specific individual tissue structure, and the pre-bending part of the biopsy forceps cannot adjust the bending angle according to the differences of individual tissue structures, and the applicability of the biopsy forceps is poor.

Utility model content

The purpose of the utility model is to provide a biopsy forceps and a biopsy system to solve the technical problem that the pre-bending part of the biopsy forceps cannot adjust the bending angle according to the difference of individual tissue structures, and the applicability of the biopsy forceps is poor.

The utility model provides a biopsy forceps, comprising a handle, an elastic tube, a forceps head assembly and a core wire assembly. The handle includes a hand-held assembly and a sliding assembly mounted on the hand-held assembly to move along the axial direction of the hand-held assembly. The handle is connected to the proximal end of the elastic tube, the forceps head assembly is connected to the distal end of the elastic tube, the core wire assembly is movably inserted into the elastic tube, and the sliding assembly is connected to the core the proximal end of the wire assembly, the forceps head assembly is connected to the distal end of the core wire assembly;

The elastic tube includes a pre-bending section adjacent to the pliers head assembly and a straight section respectively connecting two ends of the pre-bending section. In a natural state, the pre-bending section maintains an initial pre-bending angle; the pliers head assembly Including two relatively open and closed pliers;

The sliding assembly moves toward the proximal end of the hand-held assembly, so that the core wire assembly drives the bending angle of the pre-bending section to change between the initial pre-bending angle and 0°, and closes the two jaws; The slide assembly is moved distally of the hand-held assembly to expand the two jaws.

Wherein, the initial pre-bending angle is less than or equal to 45°.

Wherein, the hand-held assembly includes a sliding rod, and the sliding rod is provided with a sliding groove arranged along the axial direction of the sliding rod, and the sliding assembly includes a sliding block, and the sliding block is arranged in the sliding groove and extends along the sliding rod. The chute moves, and the proximal end of the core wire assembly is fixed on the slider.

Wherein, the hand-held assembly further includes a finger ear, and the distal end of the finger ear is clamped with the proximal end of the sliding rod.

Wherein, the distal end of the finger ear is provided with a connecting seat, and the proximal end of the sliding rod is provided with a connecting head, and the connecting head is clamped in the connecting seat so that the distal end of the finger ear is connected with the sliding rod. The proximal end of the rod snaps into place.

Wherein, the sliding assembly further includes a sliding cylinder, and the sliding cylinder is slidably sleeved on the sliding rod and fixed with the sliding block.

Wherein, the slider includes a first sub-slider and a second sub-slider, and the first sub-slider is butted with the second sub-slider.

Wherein, the first sub-slider includes a first extension part disposed at the distal end, the second sub-slider includes a second extension part disposed at the distal end, the first extension part and the second extension part Department docking.

Wherein, the first sub-slider includes a wedge-shaped groove disposed at the proximal end, and the second sub-slider includes a wedge-shaped portion disposed at the proximal end, and the wedge-shaped portion is wedge-shaped into the wedge-shaped groove.

Wherein, the sliding cylinder includes a first latching position and a second latching position opposite to the first latching position, the first extending portion is clipped into the first latching position, and the second extending portion is The sliding block is clamped into the second clamping position to limit the proximal displacement of the sliding block relative to the sliding cylinder.

Wherein, the first sub-slider further includes a first protrusion disposed between the first extension portion and the wedge-shaped groove, and the first protrusion is located at a position away from the second sub-slider side, the second sub-slider further includes a second protrusion disposed between the second extension portion and the wedge-shaped portion, the second protrusion is located on a side facing away from the first sub-slider side, the sliding cylinder includes a first card slot and a second card slot opposite to the first card slot, the first protrusion is snapped into the first card groove, and the second protrusion The sliding block is clamped into the second clamping groove to limit the distal displacement of the sliding block relative to the sliding cylinder.

The core wire assembly includes a guide rod, a core wire strand and a draw rod, the distal end of the guide rod is connected to the proximal end of the core wire strand, and the proximal end of the draw rod is connected to the core wire strand. The distal ends are connected, the proximal end of the guide rod is fixed to the sliding assembly, and the distal end of the pulling rod is connected to the forceps head assembly.

Wherein, the pliers head assembly further includes a pliers head frame and two connecting rods, each pliers head includes a pliers handle and a working pliers head, the distal end of the traction rod is provided with a first hinge joint, the pliers head The distal end of the frame is provided with a second hinge joint, the proximal ends of the two connecting rods intersect and are hinged on the first hinge joint, and the clamp handles of the two plier heads intersect and are hinged on the second hinge joint, so The distal ends of the two connecting rods and the proximal ends of the two pliers handles are respectively hinged correspondingly, so that the two connecting rods and the two plier heads form a four-link structure.

Wherein, the biopsy forceps further includes a lubricating tube, and the lubricating tube is sleeved between the core wire strand and the elastic tube.

Wherein, the biopsy forceps further comprises a protection tube, and the protection tube is sleeved on the proximal end of the elastic tube.

The utility model provides a biopsy system, comprising an endoscope and the above-mentioned biopsy forceps, wherein the endoscope includes a forceps channel, and an elastic tube of the biopsy forceps is movably fitted in the forceps channel.

To sum up, in the present application, the bending angle of the pre-bending section of the elastic tube can be changed and the two forceps heads can be opened or closed only by manipulating the sliding component to move to the proximal end or the distal end, which not only solves the problem of pre-bending the biopsy forceps. The angle of the curved portion cannot be adjusted according to the individual tissue structure, which is a technical problem of poor applicability of the biopsy forceps, and the structure of the biopsy forceps is simplified, which is more convenient for the operator to operate.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the structural representation of the biopsy system provided by the utility model;

Figure 2 is a schematic front view of the biopsy forceps in Figure 1;

FIG. 3 is a schematic front view of the elastic tube in FIG. 2 being bent and straightened, including a pliers head assembly;

Fig. 4 is the three-dimensional exploded structure schematic diagram of the handle in Fig. 2;

Fig. 5 is a perspective exploded schematic view of the slider in Fig. 4, which includes a guide rod;

Fig. 6 is the sectional structure schematic diagram of the sliding assembly in Fig. 4;

Fig. 7 is the sectional structure schematic diagram of the sliding cylinder in Fig. 4;

FIG. 8 is a schematic front view of the core wire assembly in FIG. 2;

FIG. 9 is a schematic front view of the pliers head assembly in FIG. 2 when the pliers head is opened;

FIG. 10 is a schematic front view of the pliers head assembly in FIG. 2 when the pliers head is closed;

Figure 11 is a schematic cross-sectional view of the pliers assembly in Figure 2, including a drawbar;

FIG. 12 is a schematic perspective view of the forceps head assembly in FIG. 2 , which includes the part of the elastic tube connecting the forceps head assembly.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Orientation definition: In the field of interventional medical devices, the end that is closer to the operator is usually called the "proximal end" and the end that is farther from the operator is called the "distal end" during the operation.

Please refer to FIG. 1 , the present invention provides a biopsy system including a biopsy forceps 100 and an endoscope 200 . The endoscope 200 is not limited to existing various types of bronchoscopes, gastroscopes, enteroscopes, etc., and the distal end of the endoscope 200 is provided with an ultrasonic probe or/and an optical camera (not shown). The endoscope 200 is provided with a forceps channel (not shown), and the forceps channel provides a channel for the biopsy forceps 100 to enter the human body cavity. Biopsy forceps 100 will be described in detail below.

Referring to FIG. 2 , the biopsy forceps 100 includes a handle 10 , an elastic tube 20 , a forceps head assembly 30 and a core wire assembly 40 . The handle 10 includes a hand-held assembly 101 and a sliding assembly 102 mounted on the hand-held assembly 101 and capable of moving axially along the hand-held assembly 101 . The handle 10 is connected to the proximal end of the elastic tube 20, the forceps head assembly 30 is connected to the distal end of the elastic tube 20, the core wire assembly 40 is movably inserted into the elastic tube 20, the sliding assembly 102 is connected to the proximal end of the core wire assembly 40, The forceps head assembly 30 is attached to the distal end of the core wire assembly 40 . The forceps channel of the endoscope 200 provides a channel for the elastic tube 20 of the biopsy forceps 100 and the forceps head assembly 30 to enter the human body cavity.

The elastic tube 20 is preferably a spring tube, which has certain flexibility and elasticity, and will deform compliantly when subjected to a temporary external force, and will return to its original shape after the external force is removed. The elastic tube 20 includes a pre-bent section 201 adjacent to the jaw assembly 30 and a straight section 202 respectively connecting two ends of the pre-bend section 201 . In this embodiment, the pre-bending section 201 is formed through a pre-forming process, and the pre-forming processing method may be, but not limited to, bending the section through a relatively long-lasting mechanical external force or directly braiding the section into a curved. The distal end of the elastic tube 20 is fixedly connected with the forceps head assembly 30 by welding or the like.

In a natural state, that is, in a state where no force is applied, the angle between the tangent lines at the far and near ends of the pre-bending section 201 is defined as the initial pre-bending angle α of the pre-bending section 201. In a specific embodiment, the pre-bending The initial pre-bending angle α of the segment 201 is less than or equal to 45 degrees.

The core wire assembly 40 has flexibility. Please refer to FIG. 2 and FIG. 3 at the same time, when the sliding component 102 is manipulated to move toward the proximal end of the handheld component 101 along the axial direction of the handheld component 101, the sliding component 102 pulls the core wire component 40 to move proximally in the elastic tube 20, and the core wire component 40 drives the bending angle of the pre-bending section 201 to change. That is, when the core wire assembly 40 is pulled toward the proximal end of the sliding assembly 102, the bending angle of the pre-bending section 201 changes. In this embodiment, as the sliding assembly 102 gradually moves toward the proximal end, the bending angle of the pre-bending section 201 gradually decreases.

That is to say, when the core wire assembly 40 is pulled towards the proximal end of the sliding assembly 102, the flexible core wire assembly 40 exhibits a certain rigidity, and generates a pushing force acting on the pre-bending section 201, and the pushing force makes The bending angle of the pre-bending section 201 gradually decreases, that is, the angle between the tangents at the far and near ends of the pre-bending section 201 becomes smaller under the stress state, and can even be straightened, so that the bending angle of the pre-bending section 201 can be adjusted. Adjust the change from the initial prebend angle α to 0°. When the core wire assembly 40 is no longer subjected to the pulling force of the sliding assembly 102 toward the proximal end, the above-mentioned pushing force disappears, and the pre-bending section 201 can return to the original curved shape. Therefore, after the elastic tube 20 protrudes from the forceps channel of the endoscope 400 , the elastic tube 20 of the biopsy forceps 100 can be manipulated by manipulating the sliding assembly 102 according to the different tissue structures of the individual into which the biopsy forceps 100 is to enter and perform biopsy. The bending angle of the pre-bending section 201 can be flexibly adjusted and changed between 0° and the initial pre-bending angle α, so as to smoothly enter the lumen with different bending angles, which improves the applicability of the biopsy forceps.

Please refer to FIGS. 2 and 4 , the hand-held assembly 101 includes a sliding rod 1011 . The sliding rod 1011 is provided with a sliding groove 101b axially arranged along the sliding rod 1011 . The proximal end of the core wire assembly 40 is fixed on the slider 104 inside and can move along the chute 101b. That is, when the slider 104 is controlled to move toward the proximal end in the chute 101b, the slider 104 drives the core wire assembly 40 to move toward the proximal end, so that the bending angle of the pre-bending section 201 changes. In this embodiment, the proximal end of the elastic tube 20 and the distal end of the sliding rod 101 are fixedly connected by means of bonding or the like.

Please continue to refer to FIG. 4 , the hand-held assembly 101 further includes a finger ear 103 , and the proximal end of the sliding rod 1011 is snapped into the distal end of the finger ear 103 to realize the fixing of the two. In one embodiment, the distal end of the finger ear 103 is provided with a connecting seat 103a, and the proximal end of the sliding rod 101 is provided with a connecting head 101a. The proximal end of 101 is fixed. Specifically, the connecting seat 103a has a "U-shaped" accommodating space inside, the connecting seat 103a includes a convex portion 103b facing the connecting head 101a, and the convex portion 103b is provided with a penetrating convex portion 103b and communicates with the "U-shaped" accommodating space. In the through hole 103c, the connector 101a includes a plurality of elastic arms 101c, and there is a gap between adjacent elastic arms 101c, and each elastic arm 101c has a flange 101d at its proximal end. When the connecting head 101a is assembled with the connecting seat 103a, the elastic arms 101c of the connecting head 101a are brought together so that the flanges 101d penetrate through the through holes 103c. When the flange 101d of each elastic arm 101c of the connecting head 101a completely penetrates When entering the "U-shaped" accommodating space through the through hole 103c, the gap between the elastic arms 101c expands, the elastic arms 101c return to their original positions, and the flanges 101d are clamped on the inner surface of the connecting seat 103a. And in this embodiment, the connection head 101a and the connection base 103a can rotate relative to each other, so that the finger ears 103 and the sliding rod 101 can rotate relative to each other.

Referring to FIG. 5 , the slider 104 includes a first sub-slider 105 and a second sub-slider 106 , and the first sub-slider 105 and the second sub-slider 106 are butted together. Specifically, in order to facilitate the installation of the slider 104 in the chute 101b, the first sub-slider 105 and the second sub-slider 106 are respectively installed from both sides of the chute 101b.

The first sub-slider 105 includes a first extension portion 105a disposed at the distal end, the second sub-slider 106 includes a second extension portion 106a disposed at the distal end, and the first extension portion 105a is abutted with the second extension portion 106a to The distal end of the first sub-slider 105 is butted with the distal end of the second sub-slider 106 . Specifically, the first extension portion 105a is a semi-circular ring surrounding the distal end of the first sub-slider 105, and includes two first end faces 105b facing the second extension portion 106a, and each first end face 105b is provided with several inserts The hole 105c and the second extension portion 106a are semi-circular rings surrounding the distal end of the second sub-slider 106, including two second end faces 106b facing the first extension portion 105a, The holes 105c are fitted with several protruding posts 106c, one protruding post 106c is inserted into one socket 105c, and a tight fit is formed between the protruding post 106c and the socket 105c, so that the first extension part 105a and the second extension part 106a are butted together . And when the first extension part 105a and the second extension part 106a are butted together, the first extension part 105a and the second extension part 106a form a collar that is sleeved outside the sliding rod 1011, so that when the slider 104 moves in the sliding groove 101b , the collar restricts the movement of the slider 104 in the radial direction of the sliding rod 1011, and the sliding block 104 can only move along the axial direction of the sliding rod 1011, which ensures the stability of the movement of the core wire assembly 40 and prevents the core wire assembly 40 from moving along the axis of the sliding rod 1011. The friction between the core wire assembly 40 and the elastic tube 20 caused by the radial movement.

The first sub-slider 105 includes a wedge-shaped groove 105d provided at the proximal end, and the second sub-slider 106 includes a wedge-shaped portion 106d provided at the proximal end, and the wedge-shaped portion 106d is wedge-shaped The proximal end of the slider 105 and the proximal end of the second sub-slider 106 are butted against each other. Specifically, the first sub-slider 105 is substantially “L-shaped”, including a longer main body portion 105e and a side body portion 105f connected with the main body portion 105e at an angle, and the main body portion 105e and the side body portion 105f form an “L” The side body portion 105f is provided with a wedge-shaped groove 105d facing the "L-shaped" space. The second sub-slider 106 is substantially elongated and accommodated in the "L-shaped" space. The wedge-shaped portion 106d is provided in the "L-shaped" space. The second sub-slider 106 faces one end of the wedge-shaped groove 105d, so that when the wedge-shaped portion 106d is wedge-shaped into the wedge-shaped groove 105d, the first sub-slider 105 and the second sub-slider 106 abut each other at the proximal end. Therefore, both the proximal end and the distal end of the first sub-slider 105 and the second sub-slider 106 of the present application are butted, which improves the connection stability of the first sub-slider 105 and the second sub-slider 106 .

The first sub-slider 105 further includes a first protrusion 105g disposed between the first extension portion 105a and the wedge-shaped groove 105d, the first protrusion 105g is located on the side away from the second sub-slider 106, and the second sub-slider The block 106 further includes a second protrusion 106g disposed between the second extension portion 106a and the wedge portion 106d , and the second protrusion 106g is located on the side facing away from the first sub-slider 105 . There is an included angle between the first protrusion 105g and the main body portion 105e of the first sub-slider 105, and the first protrusion 105g extends toward the direction of the first extension portion 105a, and the second protrusion 106g and the second sub-slider There is an included angle between 106, and the second protrusion 106g extends toward the direction of the second extending portion 106a,

Please refer to FIG. 2 , FIG. 4 , FIG. 6 and FIG. 7 , the sliding assembly 102 further includes a sliding cylinder 107 , and the sliding cylinder 107 is slidably sleeved on the sliding rod 1011 and fixed with the sliding block 104 . In this embodiment, the sliding cylinder 107 and the sliding block 104 are clamped and fixed. The sliding cylinder 107 drives the sliding block 104 to move in the chute 101b. When the sliding cylinder 107 drives the slider 104 to move proximally in the chute 101b, the slider 104 drives the core wire assembly 40 to move proximally, so that the bending angle of the pre-bending section 201 changes. Specifically, the sliding cylinder 107 is a hollow cylindrical structure with open ends. The sliding cylinder 107 includes a top wall 1071 , a bottom wall 1072 and a side wall 1073 disposed between the top wall 1071 and the bottom wall 1072 . The top wall 1071 and the bottom wall 1072 The two end openings of the side wall 1073 are formed by vertically extending outward, thereby forming an annular groove-shaped structure, which is convenient for the operator to stably hold and push and pull the sliding cylinder 107 .

Please refer to FIG. 6 and FIG. 7 , the sliding cylinder 107 includes a first latching position 107a and a second latching position 107b opposite to the first latching position 107a. The portion 106a is snapped into the second locking position 107b to limit the proximal displacement of the slider 104 relative to the sliding cylinder 107 . Therefore, when the sliding cylinder 107 is pushed to move to the distal end, the sliding cylinder 107 drives the slider 104 to move, and the slider 104 drives the core wire assembly 40 to move. The position limit and the position limit of the second extension portion 106a by the second locking position 107b prevents the relative displacement of the sliding cylinder 107 and the sliding block 104, thereby improving the movement stability of the core wire assembly 40. In this embodiment, the first latching position 107a and the second latching position 107b are disposed opposite to each other and form an annular groove for accommodating the collar formed by the butt joint of the first extension portion 105a and the second extension portion 106a, and the collar is clamped in the annular groove Inside.

Please refer to FIG. 7 , the sliding cylinder 107 further includes a first slot 107c and a second slot 107d opposite to the first slot 107c. The first protrusion 105g is snapped into the first slot 107c, and the second protrusion 106g The slider 104 is locked into the second engaging slot 107d to limit the distal displacement of the slider 104 relative to the sliding cylinder 107 . Therefore, when the sliding cylinder 107 is pulled to move toward the proximal end, the sliding cylinder 107 drives the slider 104 to move, and the slider 104 drives the core wire assembly 40 to move. Due to the limit and the limit of the second protrusion 106g by the second locking groove 107d, the sliding cylinder 107 and the sliding block 104 will not be displaced relative to each other, thereby improving the movement stability of the core wire assembly 40.

Referring to FIG. 8 , the core wire assembly 40 includes a guide rod 401 , a core wire strand 402 and a pulling rod 403 . The distal end of the guide rod 401 is connected to the proximal end of the core wire strand 402 , the proximal end of the pulling rod 403 is connected to the distal end of the core wire strand 402 , the proximal end of the guiding rod 401 is fixedly connected to the slider 104 , and the distal end of the pulling rod 403 Connect the jaw assembly 30. In this embodiment, the core wire strand 402 is formed by twisting several core wires, generally 4-10.

Please continue to refer to FIG. 5. In this embodiment, the main body portion 105e of the first sub-slider 105 includes a first sub-receiving groove 105h facing the second sub-slider 106, and the second sub-slider 106 includes a first sub-slider 106 facing the first sub-slider. The second sub-accommodating groove 106h of the accommodating groove 105h, when the first sub-slider 105 and the second sub-slider 106 are butted together, the first sub-accommodating groove 105h and the second sub-accommodating groove 106h form a guide rod for the guide rod 401 passes through and fixes the accommodating groove of the guide rod 401 by means of bonding or the like.

The biopsy forceps 100 further includes a lubricating tube (not shown in the figure), and the lubricating tube is sleeved between the core wire strand 402 and the elastic tube 20 . Specifically, the length of the lubricating tube is at least equal to the length of the core wire strand 402 . When the core wire strand 402 moves in the lumen of the elastic tube 20 , the lubricating tube can reduce the gap between the core wire strand 402 and the tube wall of the elastic tube 20 . friction, thereby facilitating the movement of the core strand 402.

Referring to FIGS. 2 , 9-12 , the forceps head assembly 30 includes two oppositely opening and closing forceps heads 303 , a forceps head frame 301 and two connecting rods 302 . Each pliers head 303 includes a pliers handle 3031 and a working pliers head 3032, the distal end of the draw rod 403 is provided with a first hinge joint 403a, the distal end of the forceps head frame 301 is provided with a second hinged joint 301a, The proximal ends are crossed and hinged on the first hinge joint 403a, the forceps handles 3031 of the two forceps heads 303 are intersected and hinged on the second hinge joint 301a, and the distal ends of the two links 302 are connected to the proximal ends of the two forceps handles 3031. The two connecting rods 302 and the two plier heads 303 form a four-link structure, respectively. In this embodiment, the forceps head frame 301 and the distal end of the elastic tube 20 are fixedly connected by welding or the like.

When the sliding assembly 102 moves distally relative to the hand-held assembly 101, the sliding assembly 102 pushes the core wire assembly 40 to move distally, the traction rod 403 pushes the two connecting rods 302 to move distally, and the two connecting rods 302 are relatively unfolded, thereby driving The two jaws 303 are opened. On the contrary, when the sliding assembly 102 moves toward the proximal end relative to the hand-held assembly 101, the two forceps heads 303 are closed, so as to clamp or clamp the diseased tissue to be biopsyed.

Please refer to FIG. 11 and FIG. 12 . Specifically, the clamp head frame 301 is provided with a “U-shaped” through groove 3011 along the axial direction, and the two connecting rods 302 and the clamp handles 3031 of the two clamp heads 303 are arranged in the “U-shaped” through groove 3011 . In the groove 3011, the “U-shaped” through groove 3011 includes two “U-shaped” openings 3012 arranged opposite to each other. , or move toward the central axis of the "U-shaped" through groove 3011 .

That is to say, when the pulling rod 403 of the core wire assembly 40 moves to the distal end under the driving of the sliding assembly 102 , the pulling rod 403 pushes the two links 302 to move so that the four-link structure is in the “U-shaped” through groove 3011 The inside moves toward the "U-shaped" opening 3012, and through the movement of the four-bar linkage structure, the two working forceps heads 3032 are opened, ready to clamp the diseased tissue in the target cavity; The pulling rod 403 of the core wire assembly 40 moves proximally under the driving of the sliding assembly 102, and the pulling rod 403 pulls the two connecting rods 302 to move so that the four-link structure moves toward the central axis of the “U-shaped” through-groove 3011. With the movement of the four-bar linkage structure, the two working forceps heads 3032 are closed, and during the process of turning the two working forceps heads 3032 from opening to closing, the diseased tissue in the target lumen is clamped or grasped for sampling; then, the biopsy forceps 100 The sample is taken out of the human body while keeping the two working forceps heads 3032 closed. In this embodiment, when the sliding cylinder 107 drives the sliding block 104 to move toward the distal end in the sliding groove 101b, the sliding block 104 pushes the core wire assembly 40 to move toward the distal end, so that the two working jaws 3032 are opened; otherwise, When the sliding cylinder 107 drives the sliding block 104 to move toward the proximal end in the chute 101b, the sliding block 104 pulls the core wire assembly 40 to move toward the proximal end, so that the two working jaws 3032 are closed.

In the present application, the sliding assembly 102 is pushed to the distal end by a slight distance, the core wire assembly 40 exerts a slight pushing force on the forceps head assembly 30, the working forceps 3032 of the two forceps 303 can be opened, and the elastic tube 20 The pre-bending section 201 of the elastic tube 20 needs a large force to change the bending angle. Therefore, when the two working pliers 3032 are controlled to open, the pre-bending section 201 of the elastic tube 20 is basically not deformed. And in the natural state and when the bending angle of the pre-bending section 201 is adjusted, since the core wire assembly 40 does not apply a thrust to the clamp head assembly 30, the two working clamp heads 3032 are closed.

Therefore, in the present application, when the slider 107 is manipulated to move proximally, the slider 104 drives the core wire assembly 40 to move proximally, so that the bending angle of the pre-bending section 201 of the elastic tube 20 can be changed to adjust the pre-bending section 201 The bending angle varies between the initial pre-bending angle α and 0°, so that the biopsy forceps 100 can adapt to different individual tissue structures, expand the applicability of the biopsy forceps 100, and close the two forceps heads 303; When the distal end moves, the slider 104 drives the core wire assembly 40 to move to the distal end, so that the two forceps heads 303 can be opened. Although the biopsy forceps in the prior art can also change the bending angle of the pre-bending section and drive the opening and closing of the forceps head, changing the bending angle of the pre-bending section requires a separate pulling and bending assembly to drive the two forceps heads. Opening or closing requires a separate push-pull assembly, the overall structure of the product is relatively complex, and the operation is not convenient, and in the present application, the bending angle of the pre-bending section 201 can be changed and the two pliers 303 can be opened or closed, thereby simplifying the structure of the biopsy forceps 100, making it more convenient for the operator to operate, and solving the need to separately set a pulling and bending component to change the bending angle of the pre-bending section and a push-pull component to drive the two forceps heads to open or The technical problems of complex product structure and inconvenient operation caused by closure.

In a specific embodiment, if the biopsy forceps 100 is used in conjunction with a bronchoscope, in a natural state, the pre-bending section 201 of the elastic tube 20 is kept at the pre-bending angle α, and the two forceps heads 303 are closed, limiting the natural state. The axial distance L between the second hinge joint 301a hinged by the two forceps heads 303 and the center of curvature of the pre-bending section 201 is between 20-30mm to adapt to the bronchial structure, as shown in FIG. 2 .

Please continue to refer to FIG. 2 , the biopsy forceps further includes a protection tube 50 , which is sheathed on the proximal end of the elastic tube 20 to prevent the proximal end of the elastic tube 20 from breaking at the perpendicular intersection with the distal end of the sliding rod 1011 . The protection tube 50 has flexibility and certain bending resistance.

Please return to FIG. 1 , taking the endoscope 200 as a bronchoscope as an example to illustrate the use process of the biopsy system of the present application. The forceps 100 is placed into the trachea together with the endoscope 200; the forceps head assembly 30 and the elastic tube 20 of the biopsy forceps 100 are extended from the forceps channel of the endoscope 200; the sliding cylinder 107 of the biopsy forceps 100 is pulled proximally to adjust the elasticity The bending angle of the pre-bending section 201 of the tube 20, when the angle is adjusted to suit the target tracheal lumen to be entered, push the biopsy forceps 100 to make the distal end of the elastic tube 20 and the forceps head assembly 30 enter the target lumen; make the forceps head The assembly 30 is close to the diseased tissue in the target cavity, first loosen the sliding cylinder 107 and then push the sliding cylinder 107 to the distal end, the two forceps heads 303 are opened, and aim at the diseased tissue; then pull the sliding cylinder 107 to the proximal end again, so that the two The forceps head 303 is closed to clamp the diseased tissue; the two forceps heads 303 are kept closed, the elastic tube 20 and the forceps head assembly 30 are withdrawn into the forceps channel of the endoscope 200, and then withdrawn from the human body together with the endoscope 200 to obtain the lesions tissue samples.

The above disclosures are only the preferred embodiments of the present invention, and of course, it cannot limit the scope of the rights of the present invention. Those of ordinary skill in the art can understand that all or part of the procedures for realizing the above-mentioned embodiments can be implemented according to the present invention. The equivalent changes made by the claims still belong to the scope covered by the utility model.

Claims (16)

1. a biopsy forceps, is characterized in that, comprises handle, elastic tube, forceps head assembly and core wire assembly, and described handle comprises hand-held assembly and the sliding assembly that is installed on described hand-held assembly and axially moves along described hand-held assembly , the handle is connected to the proximal end of the elastic tube, the forceps head assembly is connected to the distal end of the elastic tube, the core wire assembly is movably inserted into the elastic tube, and the sliding assembly is connected to the the proximal end of the core wire assembly, the forceps head assembly is connected to the distal end of the core wire assembly; The elastic tube includes a pre-bending section adjacent to the pliers head assembly and a straight section respectively connecting two ends of the pre-bending section. In a natural state, the pre-bending section maintains an initial pre-bending angle; the pliers head assembly Including two relatively open and closed pliers; The sliding assembly moves toward the proximal end of the hand-held assembly, so that the core wire assembly drives the bending angle of the pre-bending section to change between the initial pre-bending angle and 0°, and closes the two jaws; The slide assembly is moved distally of the hand-held assembly to expand the two jaws. 2 . The biopsy forceps according to claim 1 , wherein the initial pre-bending angle is less than or equal to 45°. 3 . 3 . The biopsy forceps according to claim 1 , wherein the hand-held component comprises a sliding rod, and the sliding rod is provided with a sliding groove axially arranged along the sliding rod, and the sliding component comprises a sliding block. 4 . , the slider is arranged in the chute and moves along the chute, and the proximal end of the core wire assembly is fixed on the slider. 4 . The biopsy forceps according to claim 3 , wherein the hand-held assembly further comprises a finger ear, and the distal end of the finger ear is clamped with the proximal end of the sliding rod. 5 . 5. The biopsy forceps according to claim 4, wherein the distal end of the finger ear is provided with a connecting seat, the proximal end of the sliding rod is provided with a connecting head, and the connecting head is stuck on the connecting seat so that the distal end of the finger ear is snapped with the proximal end of the sliding rod. 6 . The biopsy forceps according to claim 3 , wherein the sliding assembly further comprises a sliding cylinder, and the sliding cylinder is slidably sleeved on the sliding rod and fixed with the sliding block. 7 . 7 . The biopsy forceps according to claim 6 , wherein the slider comprises a first sub-slider and a second sub-slider, and the first sub-slider is abutted with the second sub-slider. 8 . 8. The biopsy forceps of claim 7, wherein the first sub-slider comprises a first extension provided at the distal end, and the second sub-slider comprises a second extension provided at the distal end part, the first extension part is butted with the second extension part. 9 . The biopsy forceps according to claim 8 , wherein the first sub-slider comprises a wedge-shaped groove provided at the proximal end, and the second sub-slider comprises a wedge-shaped portion provided at the proximal end, 10 . The wedge-shaped portion is wedge-shaped into the wedge-shaped groove. 10 . The biopsy forceps according to claim 8 , wherein the sliding cylinder comprises a first clamping position and a second clamping position opposite to the first clamping position, and the first extension portion is clamped into the first clamping position. 11 . The second extension portion is locked into the second locking position, so as to limit the proximal displacement of the slider relative to the sliding cylinder. 11 . The biopsy forceps according to claim 9 , wherein the first sub-slider further comprises a first protrusion disposed between the first extension portion and the wedge-shaped groove, and the first sub-slider A protrusion is located on the side facing away from the second sub-slider, the second sub-slider further includes a second protrusion disposed between the second extension part and the wedge-shaped part, the first sub-slider Two protrusions are located on the side facing away from the first sub-slider. The sliding cylinder includes a first slot and a second slot opposite to the first slot. The first projection is inserted into the first slot. into the first slot, and the second protrusion is clipped into the second slot, so as to limit the displacement of the slider relative to the sliding cylinder toward the distal end. 12. The biopsy forceps according to claim 1, wherein the core wire assembly comprises a guide rod, a core wire strand and a draw rod, and the distal end of the guide rod is connected to the proximal end of the core wire strand, The proximal end of the pulling rod is connected to the distal end of the core wire strand, the proximal end of the guide rod is fixed to the sliding assembly, and the distal end of the pulling rod is connected to the forceps head assembly. 13. The biopsy forceps according to claim 12, wherein the forceps head assembly further comprises a forceps head frame and two connecting rods, each of the forceps heads comprises a forceps handle and a working forceps head, and the draw rod The distal end of the clamp head frame is provided with a first hinge joint, the distal end of the clamp head frame is provided with a second hinge head, the proximal ends of the two connecting rods intersect and are hinged on the first hinge head, and the two clamp heads The pliers handles are crossed and hinged on the second hinge joint, and the distal ends of the two connecting rods are respectively hinged with the proximal ends of the two pliers handles, so that the two connecting rods are connected to the two pliers. The head forms a four-bar linkage structure. 14 . The biopsy forceps according to claim 12 , wherein the biopsy forceps further comprises a lubricating tube, and the lubricating tube is sleeved between the core wire strand and the elastic tube. 15 . 15 . The biopsy forceps according to claim 1 , wherein the biopsy forceps further comprises a protective tube, and the protective tube is sleeved on the proximal end of the elastic tube. 16 . 16. A biopsy system, characterized in that it comprises an endoscope and the biopsy forceps according to any one of claims 1-15, wherein the endoscope comprises a forceps channel, and an elastic tube of the biopsy forceps is movably fitted in the clamp tunnel.

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