WO2021035785A1

WO2021035785A1 - Disposable biopsy forceps

Info

Publication number: WO2021035785A1
Application number: PCT/CN2019/104506
Authority: WO
Inventors: 黄云凤; 丁小良; 冷德嵘; 陈凤江
Original assignee: 南微医学科技股份有限公司
Priority date: 2019-08-27
Filing date: 2019-09-05
Publication date: 2021-03-04
Also published as: CN110876631A

Abstract

Disposable biopsy forceps, at least comprising the following structure: a forceps head assembly, comprising at least two forceps heads having distal ends can be relatively opened or closed; a forceps base, proximal ends of the forceps heads being connected to a distal end of the forceps base by means of a connector; a control wire, a distal end thereof being connected to a proximal end of the forceps head assembly to drive the forceps head assembly to open or close, and further comprising a gasket, a distal end side thereof being connected to the forceps base by means of the connector, and a proximal end side thereof being provided with two extension portions that are oppositely arranged and extend toward the proximal end, an extension channel being formed between the two extension portions, and the distal end of the control wire moving in the extension channel. The biopsy forceps have a simple structure and stable and reliable technical effects.

Description

Disposable biopsy forceps

Cross-references to related applications

This application claims the priority of the Chinese patent application with the application number 201910794141.8 and the name "Disposable Biopsy Forceps" filed with the Chinese Patent Office on August 27, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to a disposable biopsy forceps, which belongs to a medical device used in the human body.

Background technique

Biopsy forceps are an indispensable tool for endoscopy to take pathological specimens. They are usually used to collect living tissue samples in human cavities such as the digestive tract and respiratory tract. If contaminated biopsy forceps are used to obtain specimens, nosocomial infections will occur. Therefore, disposable biopsy forceps are gradually being recognized by people. In the process of using disposable biopsy forceps, the following steps are usually required: actuate the control wire through the drive module on the handle, and then drive the jaw assembly at the distal end of the biopsy forceps to open, and then drive the jaws through an actuation tool such as an endoscope The components are aligned with the tissue to be clamped in the human body cavity, and finally the jaw assembly is closed to clamp the tissue through the actuation control line, and the biopsy clamp is taken out from the endoscopic channel, thereby completing the biopsy sampling. After sampling, the biopsy forceps are discarded and used as a one-time use to avoid the possibility of cross-infection. When clamping tissue, the two clamp heads in the clamp head assembly need to be able to fit as much as possible to effectively cover the tissue to be tested. At the same time, the tissue must be clamped appropriately to avoid excessive tissue damage. Of course, the forceps in this process The movement structure such as the head assembly and the control line should be centered as much as possible to reduce the resistance caused by the radial deviation, and realize the flexible use of the biopsy forceps.

The existing biopsy forceps mainly have the following three problems:

1. The existing disposable biopsy forceps are usually connected by a transition block or a direct riveting method due to the clamp head assembly and the proximal control line head. The clamp heads are easy to be misaligned, and the relative positions of the two clamp heads are not easy to fix, and they are not easy to fix. It is automatically corrected, and the movement structure in the biopsy forceps is easy to run off. These problems may cause tissue tearing caused by the dislocation of the clamp head when the clamp is sampled.

2. In order to ensure that the clamp head opens and closes smoothly without misalignment, it is necessary to perform complex welding on the connection point of the clamp head and the clamp head seat, which requires a lot of man-hours and manpower. Due to the high welding requirements, the quality control of the biopsy forceps is increased. The difficulty is higher, and the defective rate is higher.

3. The clamping amount of the existing biopsy forceps is not easy to control, and the clamping amount is often too large, which leads to an increase in the risk of injury to the human body.

In view of this, this application is hereby submitted.

Summary of the invention

Based on the technical problems existing in the prior art such as complex structure, easy deviation of the position of the clamp head, difficulty in assembly, and excessive clamping amount, the present application provides a self-consistent clamp head, moderate sampling volume, fixed position of the clamp head and centered movement structure. The biopsy forceps can realize a stable and reliable biopsy forceps, including:

The pliers head assembly includes at least two pliers heads whose distal ends can be relatively opened or closed;

A clamp base, the proximal end of the clamp head is connected to the distal end of the clamp base through a connecting piece;

A control line, the distal end of which is connected with the proximal end of the pliers head assembly to drive the pliers head assembly to open or close,

It also includes a gasket, the distal end of the gasket is connected to the clamp base through the connecting piece, the proximal side has two oppositely arranged extensions extending toward the proximal end, and an extension channel is formed between the two extensions, The distal end of the control wire moves in the extension channel.

Preferably, the proximal end of the forceps head has an insert structure with a sliding groove, and the connector positioned at the distal end of the forceps base is accommodated in the sliding groove, and when the control line is along the longitudinal axis of the biopsy forceps When moving back and forth, the connecting piece moves along the sliding groove to open or close the pliers head assembly.

Preferably, the proximal end of each pliers head has two parallel inserting piece structures with sliding grooves, and the sliding grooves on the two inserting piece structures are mirror-symmetrical; the two oppositely arranged inserts at the proximal end of the pliers head The chip structure is inserted into each other.

Preferably, the distal end of the spacer has a tissue restricting portion extending along the longitudinal axis of the biopsy forceps at the distal end, and the distal end of the tissue restricting portion has a radially extending structure.

Preferably, the distal end surface of the radially extending structure is flat, convex or concave, and the shape of the distal end surface is rectangular, circular or elliptical.

Preferably, the proximal end of the clamp base has a lumen channel, and the control wire is located in the lumen channel and extends from the proximal end to the distal end; the distal end of the clamp base is symmetrically provided with two distally extending channels. The clamp arm, the connecting piece connects the spacer and the proximal end of the clamp head to the clamp arm.

Preferably, the proximal end of the extension portion is received in the lumen channel of the clamp base to limit the radial movement of the control wire.

Preferably, the connecting member is a fixed pin, the distal end of the washer has a washer pin hole that is interference fit with the fixed pin, and the washer pin hole is open or closed. The fixing pin in this application is any part with a shaft structure in the prior art, such as rivets, rivets, screws, and mandrels, etc., subject to the fact that this part can be fixed to the pliers base, all of which are described in this application Within the scope of the fixed pin shaft.

Preferably, the distal end of the control wire and the proximal end of the pliers head assembly are connected by a drive pin shaft, and the distal end of the control wire has a control wire pin shaft hole that is interference fit with the drive pin shaft. The proximal end of the pliers head has a pliers head pin hole that is rotatably connected with the drive pin, the distal end of the control wire is clamped between the two proximal ends of the pliers head, and the drive pin extends radially through the The pliers pin hole and the control wire pin hole, and both sides of the drive pin in the radial direction protrude from the outer surface of the proximal end of the pliers head, so as to restrict the movement of the control wire in the radial direction.

This application further provides a method for preparing the above-mentioned disposable biopsy forceps, which includes the following steps:

Step 1. Connect the control wire to the pliers head assembly, so that the control line can drive the pliers head assembly to open or close;

Step 2. Pull the control wire and clamp head assembly from step 1 into the clamp head base;

Step 3. Pass the connector radially through the distal end of the pliers base, the pliers head assembly and the gasket;

Step 4. Fix the connecting piece on the clamp base.

Based on the above technical solution, this application has the following advantages:

The pliers head assembly in this application has a simple structure and only includes at least two self-annotated pliers heads, a gasket and a pliers seat structure. By using the special structure gasket in this application, the relative positioning and control of the two pliers head components are realized The radial positioning of the distal end of the wire simplifies the structure on the one hand, and minimizes the connection points for anchoring and welding in the structure. It has fewer parts, simple structure and streamlined manufacturing processes, without complicated welding processes and excessive The advantages of the installation process; on the other hand, it realizes the stability of the relative position of the forceps head and the stability of the control line in the radial direction, which greatly improves the smoothness of the biopsy forceps in use, and improves the operating flexibility and comfort of the biopsy forceps. degree.

In summary, this application provides a biopsy forceps with a self-anastomosing forceps head, moderate sampling volume, fixed forceps head position and centered movement, which can realize a biopsy forceps with a stable and reliable structure, reduce the risk of tearing during clinical forceps sampling, and reduce the amount of bleeding. And shorten the operation time.

Description of the drawings

Figure 1 is a schematic diagram of the three-dimensional structure of the disposable biopsy forceps of the present application;

Figure 2 is an exploded view of the disposable biopsy forceps in this application;

Figure 3 is a cross-sectional view of the disposable biopsy forceps of the present application along the jaw anastomotic surface;

4 is a cross-sectional view of the vertical jaw anastomosis surface of the disposable biopsy forceps of the present application;

Figures 5a-5i are perspective views of different configurations of the distal surface of the disposable biopsy forceps pad of the present application;

FIG. 6 is an assembly view of the replacement method 1 of the gasket structure in the disposable biopsy forceps of the present application;

FIG. 7 is a view to be assembled of the replacement method of the gasket structure in the disposable biopsy forceps of the present application; FIG.

FIG. 8 is an assembly view of the second method of replacing the gasket structure in the disposable biopsy forceps according to the present application;

Fig. 9 is a view of the inter-insertion cooperation of the insert structures of the proximal ends of the two jaws of the disposable biopsy forceps of the present application;

Figure 10 is a closed view of the jaw assembly of the disposable biopsy forceps of the present application;

Fig. 11 is a schematic diagram of sampling with disposable biopsy forceps according to the present application;

Figures 12a-12c are corresponding views of the first step of preparing the disposable biopsy forceps of the present application;

Figures 13a-13b are views corresponding to the second step of preparing the disposable biopsy forceps of the present application.

Description of reference signs:

1-clamp head assembly, 11-clamp head, 12-insert structure, 13-sliding groove, 14-coating structure, 15-clamp pin shaft hole, 2-clamp seat, 21-lumen channel, 22-clamp seat Arm, 23-clamp base arm pin hole, 3-control wire, 31-control wire pin hole, 32-control wire distal part, 4-spacer, 41-extension, 42-extension channel, 43-diameter Toward extension structure, 44-distal face, 45-spacer pin hole, 5-fixed pin, 6-drive pin, A-human tissue

detailed description

The technical content of this application will be described in detail with reference to the drawings and specific embodiments.

The embodiments of the present application will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application.

Some terms involved in this application are explained. The proximal end refers to the section close to the operator outside the body; the distal end refers to the end of the tissue to be closed in the body; the axial direction refers to the direction along the longitudinal axis of the biopsy forceps; the radial refers to the direction perpendicular to the axial direction; the circumferential direction Refers to the circumferential direction along the circumferential axis.

As shown in Figures 1 to 4, the disposable biopsy forceps in this application includes a forceps head assembly 1, a forceps base 2, and a control wire 3 of a forceps head 11 whose distal ends can be relatively opened or closed, wherein, The proximal end of the pliers head 11 is movably connected to the distal end of the pliers base 2 through a fixed pin 5, and the distal end of the control line 3 is rotatably connected with the proximal end of the pliers head assembly 1 through a drive pin 6 to drive the pliers head Module 1 is opened or closed. As a prior art in the field, the driving process of the control wire can be driven by actuating an actuation module (not shown in the figure) such as a slider on the proximal handle to drive the control wire to move up and down along the axis of the control wire in the biopsy forceps. In turn, the opening or closing of the biopsy forceps can be controlled. Although this embodiment describes that the pliers head assembly and the control wire are rotationally connected in the form of a drive pin, in the actual manufacturing process, it can be replaced with any structure that can realize the rotational connection between the control line and the end of the pliers head assembly, such as the remote control wire. The end has a hook-shaped structure, and the end of the pliers head assembly has a hole matching the hook-shaped structure, which can also realize the rotational connection between the two. In addition, any conventional way to achieve the rotational connection should be covered by the scope of protection of this application; in addition; In this embodiment, the fixed pin shaft can be replaced with any existing conventional method to realize the connection between the pliers head and the pliers base, and is not limited to the specific implementation described in this application.

As a core improvement point of the present application, the biopsy forceps further includes a spacer 4, the distal side of the spacer 4 is connected to the forceps base 2 by a fixed pin 5, and the proximal side has two oppositely arranged and extending proximally An extension channel 42 is formed between the two extension portions 41, and the distal end of the control wire 3 moves back and forth in the extension channel 42. By arranging the structure of the spacer 4, on the one hand, the extension 41 at the proximal end of the spacer 4 limits the movement of the control wire 3 in the radial direction, effectively avoiding the radial deviation and deviation of the control wire during the forward and backward movement. The contact friction with the outer casing and the clamp base improves the feel and flexibility of the operation. Furthermore, because the control line is limited in the extension channel 42 of the gasket 4 to move back and forth, that is, the motion trajectory of the control line 3 is limited. This ensures that the pliers head assembly connected to the distal end of the control line through the drive pin can move along the central axis to the utmost extent without deviation. In the open position, the control line and the pliers head assembly can be kept fixed and not shaken. On the other hand, the insert structure 12 at the proximal end of the two clamp heads 11 is inserted into each other, and the distal end plane of the spacer 4 and the insert structure 12 are parallel to each other and interlaced and inserted into each other. The 4-plane is further revised and defines the sliding direction of the jaw assembly during the opening and closing process, ensuring the stability of the opening and closing track of the jaw, and facilitating the tooth anastomosis on the jaw structure. Next, the specific connection relationship between the pliers head assembly 1 and the pliers base 2, the control wire 3 and the spacer 4 will be described in detail. The proximal end of the pliers head 11 in the present application is an insert structure 12 with a sliding groove 13, and the fixed pin 5 is penetrated by the pliers arm pin hole 23 on the pliers arm 22 at the distal end of the pliers base 2. Pass through the two pliers sliding grooves 13 on one side, the gasket pin hole 45 and the two pliers sliding grooves 13 on the other side in turn, then pass through the pliers arm pin hole 23 on the other side and be riveted and fixed. On the forceps base arm 22, the fixed pin 5 is accommodated in the sliding groove 13, and when the control wire 3 moves back and forth along the longitudinal axis of the biopsy forceps, the fixed pin 5 follows the sliding groove 13 Sliding to achieve opening or closing of the pliers head assembly 1.

As shown in FIGS. 2 to 4 and 5a to 5i, the proximal end of the clamp base 2 has a lumen channel 21, and the control wire 3 is located in the lumen channel 21 and extends from the proximal end to the distal end, The proximal end of the extension 41 of the spacer 4 is received in the lumen channel 21 of the clamp base 2. On the one hand, the structure of the spacer 4 can limit the radial deviation of the control line 3 in the lumen channel 21, Avoid the bad situation that the control line 3 is not on the central axis and deviate radially; on the other hand, the extension 41 of the gasket 4 in the present application is directly inserted into the lumen channel 21 at the proximal end of the clamp base 2, without complicated welding The process can fix the position of the gasket 4, which greatly simplifies the assembly process.

As shown in FIGS. 4 and 5a-5i, in the present application, it is preferable that the distal end of the spacer 4 has a tissue restriction portion (not marked in the figure) extending along the longitudinal axis of the biopsy forceps. The distal end of the restricting portion has a radially extending structure 43. By arranging the tissue restricting portion on the spacer 4, the amount of tissue entering the internal space of the forceps head assembly 1 can be effectively controlled, preventing excessive tissue from entering the internal cavity of the forceps head, and avoiding excessive damage to the human body. In the present application, the distal end surface of the radially extending structure 43 is flat (as shown in Figure 5a, Figure 5d and Figure 5g), convex (as shown in Figure 5b, Figure 5e and Figure 5h) or concave (as shown in Figure 5c, Figure 5f and Figure 5i), the shape of the distal surface is rectangular (as shown in Figure 5a, Figure 5b and Figure 5c), circular (as shown in Figure 5d, Figure 5e and Figure 5f) or elliptical (as shown in Figure 5d, Figure 5e and Figure 5f). As shown in Fig. 5g, Fig. 5h and Fig. 5i), the body tissue entering into the clamp head can be effectively controlled by the radially extending structure 43 of different shapes.

As shown in FIG. 6, as an alternative to the structure of the gasket 4 of the present application, in order to clearly show the connection relationship between the gasket and the fixed pin 5 and the clamp base 2, the clamp head assembly 1 and the control line 3 are omitted in FIG. , Does not mean that the biopsy forceps structure or the installation process does not have the forceps head assembly 1 and the control line 3 structure. In this embodiment, the shim pin hole 45 on the distal side of the shim 4 is in interference fit with the fixed pin 5 so that the shim and the fixed pin are closely matched. During the movement operation of the biopsy forceps, the shim 4 It will not be shifted or rotated by the movement of the forceps head assembly 1 or the control wire 3. At this time, unlike the previous embodiment, the extension 41 at the proximal end of the spacer 4 in this embodiment is shortened to not be stored in the inner wall of the forceps seat In this way, on the basis of reducing the overall length of the gasket, it is also possible to realize the limiting function of the control line 3 in the radial direction. This structure does not need to consider the matching of the distance between the gasket pin hole 45 and the proximal end of the extension 41 in the gasket and the distance between the fixed pin 5 and the clamp base 2 during installation, and only needs to shorten the length of the extension to a minimum. It only needs to be in contact with the clamp base, which reduces the difficulty of the gasket processing process, while still achieving the technical effects that can be achieved by the present application.

As shown in Figures 7-8, as the second alternative to the structure of the gasket 4 of the present application, in order to clearly show the connection relationship between the gasket and the fixed pin 5 and the clamp base 2, the clamp head assembly 1 and the control The omission of line 3 does not mean that the biopsy forceps structure or the structure of the forceps head assembly 1 and the control line 3 are not provided during the installation process. In this embodiment, the gasket pin hole 45 on the distal side of the gasket 4 is an open hole, and the open gasket pin hole 45 is an interference fit with the fixed pin 5 so that the gasket and the fixed pin With close cooperation, during the movement operation of the biopsy forceps, the spacer 4 will not be shifted or rotated due to the movement of the forceps head assembly 1 or the control wire 3. Different from the previous embodiment in which the gasket pin hole 45 is closed, the gasket pin hole 45 in this embodiment is open. This difference makes the gasket installation process more flexible, except that the fixed pin 5 can be used. Pass through the gasket pin hole 45 radially to realize the way of fixing the gasket. You can also clamp the gasket to the fixed pin 5 from above in the direction of the dashed arrow in Figure 7. The assembler can restrict the assembly according to the actual assembly. According to actual needs, choose a more advantageous assembly method, which greatly improves the flexibility of installation.

Further, the preferred structure of the clamp head assembly 1 in the present application will be further described. As shown in Figure 9, the proximal end of each forceps head 11 has two insert structures 12 that are both parallel to the longitudinal axis of the biopsy forceps, and the sliding groove 13 is provided on the insert structure 12, and the two The slide grooves on the insert structure 12 are mirror-symmetrical to ensure that when the fixed pin 5 slides in the slide groove 13, the planes of the two insert structures 12 are always along the direction parallel to the longitudinal axis of the biopsy forceps without offset, ensuring the forceps Stability of head opening and closing. In this embodiment, the inserting piece structures 12 at the proximal ends of the two oppositely arranged jaws 11 are mated with each other, which can achieve the operation of mutually restricting the radial offset of the jaws. In this embodiment, one insert structure 12 at the proximal end of each pliers head 11 has a pliers pin shaft hole 15, and the two pliers 11 have a pliers pin hole 15 on the insert structure 12 respectively located on the gasket 4 Both sides, so as to achieve the purpose of movably connecting the clamp head assembly 1 with the gasket 4, the clamp base 2 and the control line by the fixed pin 5.

As shown in FIG. 9, the distal end of each of the forceps 11 has a jaw structure (not marked in the figure), the jaw structure is set toward the longitudinal axis of the biopsy forceps, and the two oppositely arranged forceps 11 are facing all the way. One side of the longitudinal axis of the biopsy forceps is respectively provided with a toothing structure 14 which is located at the edge of the jaw structure. When the jaw assembly 1 is closed, the toothing structures 14 on the two opposite jaw structures are mutually Engage, and form an accommodating space for accommodating human tissues between the two jaw structures. In the present application, the rodent structure 14 on the two jaw structures realizes the automatic meshing correction effect of the rodent structure of the clamp head, which can further correct the center position of the clamp head, and achieve the self-anastomosis function of the clamp head without additional assembly process assistance. , Effectively avoid tissue tearing defects caused by the dislocation of the clamp head.

As shown in Figures 2 to 4, the distal portion 32 of the control wire 3 in the present application has a control wire pin shaft hole 31 that is in interference fit with the drive pin 6, and the proximal end of each clamp head 11 There is a pliers pin hole 15 rotatably connected with the drive pin 6, the distal end portion 32 of the control wire is clamped between the two insert structures 12 at the proximal end of the pliers, and the drive pin 6 is along the diameter Extends through the pliers pin shaft hole 15 and the control line pin shaft hole 31, and both sides of the drive pin 6 in the radial direction protrude from the outer surface of the insert structure 12 at the proximal end of the pliers head (away from The side of the longitudinal axis, that is, the side close to the inner surface of the lumen channel 21), is almost in contact with the inner wall of the lumen channel 21 at the proximal end of the clamp base 2, thereby limiting the control line 3 in the lumen channel 21 to the greatest extent. The movement in the radial direction ensures that the rod shaft is always in the center position.

The basic operation process of the disposable biopsy forceps in this application is as follows: as shown in Figures 10-11, the control line (not shown) is actuated by the drive module on the handle, which then drives two of the jaw assemblies 1 at the distal end of the biopsy forceps. The forceps head 11 is relatively opened, and then the forceps head assembly 1 is driven to align with the tissue A in the body cavity to be clamped by an actuating tool such as an endoscope, so that the tissue A enters the space defined by the jaw structures of the two forceps heads 11 opposed to each other. Inside, the rodent structure 14 can play the role of occluding and grasping the tissue at this time. The radially extending structure 43 on the distal surface of the spacer 4 abuts the tissue A and defines the volume of tissue that enters the internal space of the forceps head assembly. By actuating the control wire 3, the jaw assembly 1 is closed and the tissue A is clamped. At this time, the rodent structures 14 in the forceps head assembly 1 are close to each other and then engage to form a closed state of the clamp head. In the closed state, the rodent structure 14 of the clamp head automatically The meshing correction can further correct the center position of the forceps head 11, achieve the self-anastomosis function of the forceps heads, and effectively avoid tissue tearing defects caused by the dislocation of the forceps heads. Finally, by pulling the handle, the biopsy forceps are taken out of the endoscope channel to complete the biopsy sampling. After sampling, the biopsy forceps are discarded and used as a one-time use to avoid the possibility of cross-infection.

In addition, the assembly process of the disposable biopsy forceps in this application is briefly described, but it is not limited to the following assembly process:

Step 1, as shown in Figure 12, firstly insert the two pliers 11 into each other so that the pliers pin holes 15 on the two pliers are aligned, and move the distal end 32 of the control wire in the direction of the dashed arrow ① in Figure 12 Insert between the two pliers pin holes 15 and align the pliers pin holes 15 on the two pliers heads with the control wire pin shaft holes 31 at the distal end of the control wire; In the direction of the dashed arrow ②, the drive pin 6 is passed through the jaw pin hole 15 of the insert structure 12 at the proximal end of the jaw on one side, the control wire pin hole 31 at the distal end of the control wire, and the other in turn in the radial direction. The clamp pin hole 15 of the insert structure 12 at the proximal end of the clamp head completes the connection between the control line 3 and the clamp head assembly (as shown in Figure 12b and Figure 12c);

Step 2 shown in Figure 13, first insert the washer 4 between the two pliers 11 in the direction of the dashed arrow ① in Figure 13, so that the four sliding grooves 13 in the two pliers 11 are far away from the washer. The shim pin hole 45 on the end side is aligned; then in the direction of the dashed arrow ② in Fig. 13, the two pliers heads 11 and the shim are simultaneously inserted between the two pliers base arms 22 of the pliers base 2, and the pliers The two pin holes of the clamp seat arm at the far end of the seat arm are aligned with the four sliding grooves 13 and the spacer pin hole 45; finally, in the direction of the dashed arrow ③ in Figure 13, move the fixed pin 5 away from the clamp seat 2. The pin hole 23 of the pliers seat arm on the end of the pliers seat arm 22 penetrates and sequentially passes through the two pliers sliding grooves 13 on one side, the gasket pin hole 45 and the two pliers sliding grooves 13 on the other side. Then the pin hole 23 of the forceps base arm on the other side is penetrated and riveted and fixed on the forceps base arm 22, and the fixed pin 5 is accommodated in the sliding groove 13, thereby realizing the assembly of the disposable biopsy forceps of the present application ( As shown in Figure 13b). When the control wire 3 moves back and forth along the longitudinal axis of the biopsy forceps, the fixed pin 5 slides along the sliding groove 13 to open or close the forceps head assembly 1.

In the present application, the assembly of the biopsy forceps can be realized in two simple steps, and the mating connection of various components can be realized through a single riveting process, which greatly simplifies the assembly process of the existing biopsy forceps and improves the assembly efficiency.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application Range.

Claims

A disposable biopsy forceps, at least including the following structures:

The pliers head assembly includes at least two pliers heads whose distal ends can be relatively opened or closed;

A clamp base, the proximal end of the clamp head is connected to the distal end of the clamp base through a connecting piece;

A control line, the distal end of which is connected with the proximal end of the pliers head assembly to drive the pliers head assembly to open or close,

Its characteristics are:

It also includes a gasket, the distal side of the gasket is connected to the clamp base through the connecting piece, the proximal side has two oppositely arranged extensions extending toward the proximal end, and an extension is formed between the two extensions Channel, the distal end of the control line moves in the extension channel.
The disposable biopsy forceps according to claim 1, wherein:

The proximal end of the forceps head has an insert structure with a sliding groove, and the connecting member positioned at the distal end of the forceps base is accommodated in the sliding groove, and when the control wire moves back and forth along the longitudinal axis of the biopsy forceps , The connecting piece moves along the sliding groove to open or close the pliers head assembly.
The disposable biopsy forceps according to claim 2, wherein:

The proximal end of each pliers head has two parallel inserting piece structures with sliding grooves, and the sliding grooves on the two inserting piece structures are mirror-symmetrical; the two oppositely arranged inserting piece structures of the proximal end of the jaws are mutually Insert fit.
The disposable biopsy forceps according to claim 1, wherein:

The distal end of the spacer has a tissue restricting portion extending along the longitudinal axis of the biopsy forceps at the distal end, and the distal end of the tissue restricting portion has a radially extending structure.
The disposable biopsy forceps according to claim 4, characterized in that:

The distal surface of the radially extending structure is flat, convex or concave, and the shape of the distal surface is rectangular, circular or elliptical.
The disposable biopsy forceps according to claim 1, wherein:

The proximal end of the forceps base has a lumen channel, and the control wire is located in the lumen channel and extends from the proximal end to the distal end; the distal end of the forceps base is symmetrically provided with two forceps base arms extending distally The connecting piece connects the spacer and the proximal end of the pliers head to the arm of the pliers base.
The disposable biopsy forceps according to claim 6, characterized in that:

The proximal end of the extension is received in the lumen channel of the clamp base to limit the radial movement of the control wire.
The disposable biopsy forceps according to any one of claims 1-7, characterized in that:

The connecting member is a fixed pin, the distal end of the washer has a washer pin hole that is interference fit with the fixed pin, and the washer pin hole is open or closed.
The disposable biopsy forceps according to any one of claims 1-7, characterized in that:

The distal end of the control wire and the proximal end of the pliers head assembly are connected by a drive pin shaft, the distal end of the control wire has a control wire pin shaft hole that is interference fit with the drive pin shaft, and each of the pliers head is close to The end has a pliers pin hole rotatably connected with the drive pin, the distal end of the control wire is clamped between the two proximal ends of the pliers, and the drive pin extends radially through the pliers pin A shaft hole and a control wire pin shaft hole, and both sides of the drive pin in the radial direction protrude from the outer surface of the proximal end of the pliers head, so as to restrict the movement of the control wire in the radial direction.
A method for assembling the disposable biopsy forceps according to any one of claims 1-9, comprising the following steps:

Step 1. Connect the control wire to the pliers head assembly to realize that the control line can drive the pliers head assembly to open or close;

Step 2. Pull the control wire and clamp head assembly from step 1 into the clamp head base;

Step 3. Pass the connector radially through the distal end of the pliers base, the pliers head assembly and the gasket;

Step 4. Fix the connecting piece on the clamp base.