WO2020125675A1

WO2020125675A1 - Knob assembly and cylindrical anastomat

Info

Publication number: WO2020125675A1
Application number: PCT/CN2019/126296
Authority: WO
Inventors: 陈志�; 郭毅; 林江
Original assignee: 天臣国际医疗科技股份有限公司
Priority date: 2018-12-18
Filing date: 2019-12-18
Publication date: 2020-06-25

Abstract

A knob assembly and a cylindrical anastomat. The knob assembly comprises a knob body (1), a clutch member, and a knob rear cover. The knob body (1) is provided with a first matching member (11). When the knob body (1) rotates, a screw (6) is driven to move along the axial direction of the anastomat. The clutch member is provided with a second matching member (21). A press spring (3) is provided between the knob rear cover and the clutch member. The knob assembly is divided into the knob body (1) and the clutch member. Before the drag force experienced by the knob body (1) reaches a preset value, the clutch member is rotated to drive the knob body (1) to rotate, and the knob body (1) can drive a nail anvil component (83) to move along the axial direction of the anastomat to get close to a nail bin (82). After the drag force experienced by the knob body (1) reaches the preset value, the clutch member cannot drive the knob body (1) to rotate. In this case, the knob assembly enters an invalid state, and the gap between the nail anvil component (83) and the nail bin (82) stays unchanged so that the tissue is not excessively squeezed.

Description

Knob assembly and round tube type stapler

Technical field

The invention relates to the technical field of medical equipment, in particular to a knob assembly and a circular tube-type stapler.

Background technique

Gastrointestinal diseases are one of the most common diseases in humans. In the process of treatment, a circular tube-type stapler is often used to replace the doctor's manual operation to anastomize the digestive tract and other physiological tissues. The round tube stapler is a common surgical instrument. Most of them use axial inward binding. During the operation, they form an end-to-end or end-to-side anastomosis of the esophagus, stomach, intestine and other physiological tissues. The segmental tissues are contained and contained in the stapler, and after the firing is completed, a circular anastomosis is formed on the tissue to reconstruct the human body channel.

In the prior art, a round tube type stapler includes a stapler body, an operation handle movably connected to the stapler body, and a nail anvil assembly cooperating with the body. The stapler body includes a staple cartridge assembly disposed at a distal end, the staple cartridge assembly includes a ring-shaped staple cartridge, a cutter; and a knob disposed at a proximal end of the body, the knob can rotate relative to the body, and the stapler The interior of the body also includes a nail anvil shaft disposed from the proximal end to the distal end. Here, the distal end and the proximal end are relative to the operator. The end closer to the operator is the proximal end, and the end farther from the operator, that is, the end closer to the operation position is the distal end. In the stapler, the inside and the outside are relative to the axis of the stapler, the side near the axis is the inside, and the side away from the axis is the outside. The nail anvil assembly includes a nail anvil, a nail anvil cap disposed at a distal end of the nail anvil, and a knife anvil disposed inside the nail anvil. The nail anvil assembly may be directly connected to the distal end of the nail anvil shaft or connected through a nail anvil shaft connection . During tumor surgery, after removing the tumor tissue, the nail anvil shaft penetrates from the purse of the stump tissue and is located at the distal end of the stapler body. Rotate the knob to gradually reduce the distance between the nail anvil assembly and the nail cartridge After reaching a suitable distance, it can reach the firing state, and then the operating handle can be used to complete the anastomosis. With the continuous development of medical devices, the round tube stapler is also more and more widely used in the treatment of diseases such as hemorrhoids.

In the process of rotating the knob to make the anvil assembly approach the staple cartridge, sometimes the knob can be rotated after the tissue is closed in place, so that the staple anvil assembly and the staple cartridge will continue to approach and continue to compress the tissue, causing tissue Excessive squeezing may even crush the tissue, which is very detrimental to the surgical results.

Summary of the invention

In view of the problems in the prior art, the object of the present invention is to provide a knob assembly and a tube-shaped stapler. When the knob is rotated, when the resistance of the knob reaches the preset resistance value, the knob will not be able to transmit a larger Torque, the knob at this time enters a failure mode, and the gap between the anvil assembly and the staple cartridge remains unchanged without causing excessive tissue compression.

An embodiment of the present invention provides a knob assembly for a round tube-type stapler, and a screw rod is provided inside the stapler; the knob assembly includes:

A knob body, the knob body is sleeved on the outside of the screw rod, a drive member is provided on the knob body, a first fitting member is provided on a proximal end surface of the drive member, and the wire is driven when the knob body rotates The rod moves in the axial direction of the stapler;

The clutch member is located at the proximal end of the driving member, and the distal end surface of the clutch member has a second mating member corresponding to the first mating member. The second mating member may be opposite to the first mating member. Axial movement, and when the second mating member is in contact with the first mating member, the rotation of the clutch member rotates the knob body;

A knob back cover is located at the proximal end of the knob body, and a compression spring is provided between the knob back cover and the proximal end surface of the clutch.

Optionally, the matching pieces are all convex.

Optionally, the first fitting piece is a protrusion, and the second fitting piece is a groove.

Optionally, the first fitting piece is a groove, and the second fitting piece is a protrusion.

Optionally, the first mating piece includes a first side face, the second mating piece includes a third side face that cooperates with the first side face, and the first side face of the first mating piece faces a first direction tilt.

Optionally, the first mating member further includes a second side, and the second mating member further includes a fourth side that cooperates with the second side.

Optionally, the second side face of the first fitting piece is a right-angle face, or the second side face of the first fitting piece is inclined toward the second direction and the degree of inclination of the second side face of the first fitting piece is less than the The inclination of the first side.

Optionally, the first side of the first mating member and the third side of the second mating member are both flat or mating curved surfaces, and the second side of the first mating member and the fourth side of the second mating member The sides are flat or matching curved surfaces.

Optionally, the clutch member includes a clutch ring, and the clutch ring is sleeved on the outside of the knob body.

Optionally, at least one directional groove is provided on the side of the clutch member, and the inner surface of the knob housing of the knob assembly is provided with directional ribs corresponding to the directional grooves one by one, the directional ribs are along the axis of the stapler It extends in the direction and extends into the orientation groove.

Optionally, at least one directional rib is provided on the side of the clutch member, and the inner surface of the knob housing of the knob assembly is provided with an directional groove corresponding to the directional rib, and the directional rib is along the axis of the stapler It extends in the direction and extends into the orientation groove.

Optionally, the inner surface of the knob housing of the knob assembly is provided with a stepped portion, and the stepped portion is located on the distal end surface of the clutch.

Optionally, the distal end of the rear cover of the knob is provided with an internal thread of the rear cover, and the proximal end of the knob body is provided with an external body thread matched with the internal thread of the rear cover.

An embodiment of the present invention also provides a round tube type stapler including the knob assembly.

The knob assembly and the round tube type stapler provided by the invention have the following advantages:

The invention provides a knob assembly for a round tube-type stapler. The knob assembly is divided into a knob body and a clutch member. When the resistance of the knob body reaches the preset resistance value, rotating the clutch member can bring the knob body together Rotating, the knob body can drive the anvil assembly to move along the axial direction of the stapler and close to the staple cartridge. When the resistance of the knob reaches the preset resistance value, the clutch cannot drive the knob body to rotate, and the knob assembly enters the failure mode , The gap between the anvil assembly and the staple cartridge remains unchanged, without causing excessive tissue compression.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For a person of ordinary skill in the art, without paying any creative work, other drawings can be obtained based on these drawings.

1 is a schematic structural diagram of an anastomotic device according to an embodiment of the present invention;

2 is a schematic diagram of the knob assembly and the screw rod according to an embodiment of the present invention;

3 is a schematic structural view of a knob body according to an embodiment of the invention;

4 is a schematic structural view of a clutch ring according to an embodiment of the invention;

5 is a schematic structural diagram of a knob housing according to an embodiment of the present invention;

6 is a schematic structural view of a first knob back cover according to an embodiment of the invention;

7 is a schematic structural diagram of the cooperation between the knob body and the clutch ring in an initial state according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of the cooperation between the knob body and the clutch ring when the knob assembly fails according to an embodiment of the present invention.

detailed description

To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, but not all the embodiments.

The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

In order to solve the technical problems in the prior art, the present invention provides a knob assembly, the knob assembly includes a knob body, a clutch member and a knob back cover, the knob body is sleeved on the outside of the screw, the A drive member is provided on the knob body, and a first fitting member is provided on the proximal end surface of the drive member. When the knob body rotates, the screw is moved along the axial direction of the stapler; the clutch member is located on the drive member At the proximal end, a second mating member is provided on the distal end surface of the clutch member, and the second mating member can move axially relative to the first mating member. The second mating member has a first state that can drive the first mating member, and a second state that cannot drive the first mating member. When the second fitting is in the first state, the rotation of the clutch drives the knob body to rotate. When the second fitting is in the second state, the rotation of the clutch does not drive the knob body to rotate. The clutch member moves axially proximally relative to the knob body; the knob back cover is located at the proximal end of the knob body, and a compression spring is provided between the knob back cover and the proximal end surface of the clutch member .

Therefore, the present invention divides the knob assembly into a knob body and a clutch. In addition, a knob back cover and a positioning compression spring are provided at the proximal end of the knob body. The axial movement of the clutch member toward the proximal end of the stapler is hindered by the compression spring, that is, the axial movement of the clutch member needs to overcome the spring force of the compression spring. The driving part and the clutch part of the knob body together constitute a clutch structure. When the operator rotates the knob assembly, the clutch is first driven by the operator's rotational force to rotate. Before the resistance of the knob body reaches the preset resistance value, the clutch mechanism can transmit a torque greater than the resistance of the knob body. The knob body and the clutch member are linked. Rotating the clutch member can drive the knob body to rotate together. The knob body can drive the nail anvil assembly Move along the axial direction of the stapler to approach or move away from the staple cartridge; when the resistance of the knob reaches the preset resistance value, the clutch mechanism cannot transmit torque greater than the resistance of the knob body, and the clutch moves and drives to the proximal end of the stapler The piece is disengaged and the compression spring is pressed. At this time, the clutch piece cannot drive the knob body to rotate, the knob assembly enters the failure mode, and the gap between the nail anvil assembly and the nail cartridge remains unchanged without causing excessive tissue compression. Among them, the preset resistance value is determined by the inclination of the contact surface between the driving member and the clutch member and the spring force of the compression spring, and the preset resistance value corresponds to the compression of the tissue between the anvil assembly and the cartridge assembly The size of the maximum tissue squeezing force.

An embodiment of the present invention also provides a round tube-type stapler. The knob assembly is located at a proximal end of the stapler. A staple cartridge assembly and a nail anvil assembly are provided at the distal end of the stapler. The nail anvil assembly It is connected to the distal end of the screw rod by a nail anvil shaft or directly connected to the distal end of the screw rod. When the knob body is rotated, the nail anvil assembly can be driven to move along the axial direction of the stapler by the anvil shaft to approach or move away from the nail cartridge assembly.

In the initial state where the anvil assembly and the stapler body with the staple cartridge assembly have just been successfully docked, rotate the knob in the first direction and the clutch rotates. At this time, because the tissue has not been clamped, the resistance of the knob body has not reached the preset resistance Value, the clutch mechanism can transmit torque greater than the resistance of the knob body, the compression spring maintains the initial state, no deformation or a certain amount of initial deformation occurs, the clutch member drives the knob body to rotate in the first direction, that is, the second mating member is in In the first state, the first mating member is driven, and the anvil assembly is driven by the anvil shaft and the screw to gradually approach the nail cartridge assembly.

After the tissue is clamped between the anvil assembly and the staple cartridge assembly, the knob is rotated, and the knob body will be subjected to resistance that inhibits rotation in the first direction. This resistance corresponds to the tissue pressing force between the nail anvil assembly and the staple cartridge assembly. At this time, only when a rotational torque greater than the resistance is applied to the knob body can the knob body be turned in the first direction. When the resistance is greater than the resistance preset value, if a greater rotational torque is applied to rotate the clutch member, the reaction force of the rotation torque received by the knob body is given to the clutch member, the reaction force will overcome the spring force of the compression spring and compress the compression spring If the deformation occurs, the clutch member will produce axial movement towards the proximal end of the stapler, and the second mating member of the clutch member will disengage from the first mating member of the knob body, that is, the second mating member is in the second state without driving the first mating At this time, the clutch cannot transmit the rotational torque applied by the operator to the knob body, the knob body will not rotate, the clutch is idling idle, and the first and second mating parts can be released At the moment, the knob assembly is in a failure state, the nail forming gap between the anvil assembly and the nail cartridge assembly remains unchanged, and the tissue will not be over-squeezed.

The circular tube-type stapler provided in an embodiment of the present invention and the knob assembly therein will be described in detail below with reference to the drawings.

As shown in FIGS. 1 and 2, the structure of the stapler according to an embodiment is shown. The stapler includes a stapler body and an anvil assembly 83, wherein the stapler body includes a stapler housing 81, a staple cartridge assembly 82 located at the distal end of the stapler housing 81, and a proximal end at the stapler housing 81 The knob assembly and the screw 6 disposed from the proximal end to the distal end, the nail cartridge assembly 82 includes an annular nail cartridge and a cutter, the nail anvil assembly 83 includes a nail anvil and a nail anvil shaft, and the nail anvil is connected to the screw shaft through the nail anvil shaft 6's far end. When the knob assembly rotates, the nail anvil assembly 83 is driven to move axially through the screw rod and the anvil shaft sequentially, away from or near the nail cartridge assembly 82.

Of course, in another type of circular tube-type stapler, such as the aforementioned circular tube-type stapler for hemorrhoid surgery, the nail anvil assembly 83 is directly connected to the stapler body, and the nail anvil assembly 83 cannot be anastomosed from The nail body is removed, and the nail anvil assembly 83 does not include the nail anvil shaft, and the nail anvil is directly fixedly connected to the distal end of the screw rod 6. The present invention will be described by taking an example of such a stapler.

As shown in FIGS. 2 to 6, the knob assembly includes a knob body 1, a clutch member and a knob back cover, the knob body 1 is sleeved outside the screw rod 6, and the knob body 1 is provided with a driving member 14. The proximal end surface of the driving member 14 is provided with a first fitting member, and the internal body of the knob body 1 is provided with internal thread 13 which cooperates with the screw 6 of the stapler. When the knob body 1 rotates The screw 6 is driven to move along the axial direction of the stapler; the clutch member is located at the proximal end of the driving member 14, a second mating member is provided on the distal end surface of the clutch member, and the second mating member can be opposite to Axial movement of the first mating member, the second mating member has a first state that can drive the first mating member, and a second state that cannot drive the first mating member. When the second mating member is in the first state, the rotation of the clutch member drives the knob body 1 to rotate, and when the second mating member is in the second state, the rotation of the clutch member does not drive the knob body to rotate, The clutch member moves axially proximally with respect to the knob body; the knob back cover is located at the proximal end of the knob body 1 and is disposed between the knob back cover and the proximal end surface of the clutch member有压Spring3。 There are compression spring 3.

In this embodiment, the clutch member includes a clutch ring 2 which is sleeved on the knob body 1. The first mating member is disposed on the proximal end surface of the driving member 14, and the second mating member corresponds to the first mating member in one-to-one correspondence. The first matching member may be a first protrusion 11, and the second matching member may be a second protrusion 21. In other alternative embodiments, the first matching member and the second matching member can also be selected as other structures, for example, the first matching member is a protrusion, the second matching member is a groove that cooperates with the protrusion, or the first The mating member is a groove, the second mating member is a protrusion that cooperates with the groove, and the like, which all fall within the protection scope of the present invention. Further preferably, the first protrusion 11 includes a first side 111, the second protrusion 21 includes a third side 211, and when the clutch ring 2 rotates in a first direction 61 under external force, the first protrusion The first side 111 of the first protrusion 11 is in contact with the third side 211 of the second protrusion 21, and the first side 111 of the first protrusion 11 is inclined toward the first direction 61. The inclination direction of the third side surface 211 of the second protrusion 11 corresponds to the first side surface 111.

In the view of the stapler from the proximal end to the distal end, the first direction 61 is a clockwise direction, and the second direction 62 is a counterclockwise direction. When the clutch ring 2 is rotated in the clockwise direction, and the knob body 1 is rotated in the clockwise direction, the screw 6 moves toward the proximal end of the stapler, and drives the anvil assembly 83 closer to the staple cartridge assembly 82, in a counterclockwise direction When the clutch ring 2 is rotated, and the knob body 1 is rotated in the counterclockwise direction, the screw 6 moves toward the distal end of the stapler, and drives the nail anvil assembly 83 away from the nail cartridge assembly 82.

In this embodiment, the first side surface 111 and the third side surface 211 are inclined surfaces. When the resistance of the knob body 1 is greater than the preset resistance value, the clutch ring 2 rotates in the first direction 61 under external force And when a large rotating torque is applied to the knob body 1, the reaction force of the knob body 1 to the clutch ring 2 is decomposed by the inclined plane, and after the decomposition, the force along the axial direction of the stapler pushes the clutch ring 2 to move toward the proximal end of the stapler. In order to overcome the elastic force of the compression spring 3, the compression spring 3 is deformed, so that the knob body 1 and the clutch ring 2 are gradually separated from each other. The preset resistance value may be determined by the magnitude of the spring force of the compression spring 3 and the degree of inclination of the first side 111 and the third side 211. In addition, due to the inclination of the first side surface 111 of the first protrusion 11 and the third side surface 211 of the second protrusion 21, the clutch ring 2 rotates clockwise and does not interlock with the knob body 1 The second protrusion 21 having a displacement at the end is more easily separated from the first protrusion 11.

In this embodiment, the first protrusion 11 further includes a second side 112, and the second protrusion 21 further includes a fourth side 212. When the clutch ring 2 is rotated in the second direction 62 by external force, the The second side 112 of the first protrusion 11 is in contact with the fourth side 212 of the second protrusion 21 to facilitate the rotation of the knob body 1 in the second direction when the clutch ring 2 is rotated in the second direction 62 62 rotation increases the distance between the anvil assembly 83 and the cartridge assembly 82.

In this embodiment, the second side surface 112 of the first protrusion 11 is a right angle surface, and correspondingly, the fourth side surface 212 of the second protrusion 21 is also a right angle surface. The right-angle surface here refers to the surface of the second side 112 of the first protrusion 11 perpendicular to the driving member 14. In other alternative embodiments, the second side surface 112 of the first protrusion 11 may also be inclined toward the second direction 62 and the second side surface 112 of the first protrusion 11 is less inclined than the first side of the first protrusion 11 The inclination degree of one side 111 corresponds to the inclination direction and angle of the fourth side 212 of the second protrusion 21 corresponding to the second side 112. In this way, when the clutch ring 2 rotates in the second direction 62, the second protrusion 21 is not easy to disengage from the first protrusion 11, thereby preventing the knob assembly from tightening in the first direction 61 when When operating in the direction, the knob body 1 cannot be driven to rotate in the second direction 62 to increase the distance between the anvil assembly 83 and the staple cartridge assembly 82.

The first side 111 of the first protrusion 11 and the third side 211 of the second protrusion 21 are both flat or matching curved surfaces, and the second side 112 and the second protrusion 21 of the first protrusion 11 The fourth side 212 is a flat surface or a matching curved surface.

In this embodiment, the knob back cover includes a first knob back cover 5 and a second knob back cover 7. The distal end of the first knob back cover 5 is provided with a back cover internal thread 51, and the knob body 1 is near The end is provided with a body external thread 12 that cooperates with the internal thread 51 of the rear cover, the first knob back cover 5 is matched with the proximal end of the knob body 1 through the thread, and the second knob back cover 7 can be installed on the first knob back cover The proximal end of 5. The first knob back cover 5 can provide support and limit for the proximal end of the compression spring 3.

As shown in FIGS. 7 and 8, the structure in which the knob body 1 and the clutch ring 2 cooperate in the initial state and the failed state are respectively shown.

In the initial state where the anvil assembly 83 has just docked with the stapler body or the tissue has just been incorporated, the knob assembly is in the initial state, and the operator rotates the clutch ring 2 in the first direction 61. At this time, since the tissue has not been clamped, The resistance of the knob body 1 does not reach the preset resistance value, and the clutch mechanism can transfer the torque greater than the resistance of the knob body 1 from the clutch ring 2 to the knob body through the cooperation between the first protrusion 11 and the second protrusion 21 1. At this time, the reaction force of the knob body 1 to the clutch ring 2 is insufficient to overcome the elastic force of the compression spring 3. As shown in FIG. 7, at this time, the compression spring 3 maintains the initial state without deformation or a certain amount of initial deformation, the second fitting is in the first state, the second protrusion 21 of the clutch ring 2 and the knob body 1 The first protrusion 11 fully contacts and fits, the rotation of the clutch ring 2 drives the knob body 1 to rotate in the first direction 61, and the nail anvil assembly 83 is driven by the screw rod 6 and the nail cartridge assembly 82 gradually approaches each other.

When the anvil assembly 83 and the cartridge assembly 82 reach a suitable distance and the pressing force on the tissue reaches a suitable predetermined value, then the clutch ring 2 of the knob assembly is rotated in the first direction 61, the knob body 1 will be hindered Its resistance to rotation in the first direction 61, at this time, only when a rotational torque greater than the resistance is applied to the knob body 1 can the knob body 1 be turned in the first direction 61. That is, when the resistance is greater than the resistance preset value, if the operator applies a rotation torque less than the resistance to the clutch ring 2, the clutch ring 2 is blocked by the knob body 1 and cannot rotate, if the operator applies a rotation torque greater than the resistance to rotate In the clutch ring 2, the reaction force of the rotation torque received by the knob body 1 is transmitted to the clutch ring 2 through the cooperation between the first protrusion 11 and the second protrusion 21, and the component of the reaction force in the axial direction will overcome the pressure The spring force of the spring 3 urges the compression spring 3 to deform. As shown in FIG. 8, the clutch ring 2 will produce an axial movement toward the proximal end of the stapler, so that the second protrusion 21 of the clutch ring 2 disengages from the first protrusion 11 of the knob body 1, that is, the second fitting is in the first position. In the second state, at this time, the clutch ring 2 cannot transmit the rotational torque applied by the operator to the knob body 1, the knob body 1 does not rotate, the clutch ring 2 performs invalid idling, and can emit the first protrusion 11 and The click sound when the second protrusion 21 is tripped. At this time, the knob assembly is in a failure state, the nail forming gap between the nail anvil assembly 83 and the nail cartridge assembly 82 remains unchanged, and the tissue will not be excessively pressed. If the operator hears a click or according to the feel of rotating the knob assembly in the failure state, it can determine that the current anvil assembly 83 has moved into place, and can perform the firing operation of the stapler.

Further, the stapling device further includes a knob housing 4, an inner surface of the knob housing 4 is provided with a fourth fitting portion; the clutch ring 2 is located inside the knob housing 4, and the side of the clutch ring 2 is provided There is a third mating portion, which cooperates with the fourth mating portion, so that the knob housing 4 can drive the clutch ring 2 to rotate, and the clutch ring 2 can move axially relative to the knob housing 4.

When the operator rotates the knob assembly, the knob housing 4 linked with the clutch ring 2 is rotated, and the knob housing 4 does not restrict the clutch ring 2 from moving toward the proximal end of the stapler and returning to the initial position. In this embodiment, the third mating portion includes at least one directional groove 22 on the axial side of the clutch ring 2, and the fourth mating portion includes directional ribs 41 corresponding to the directional groove 22 in one-to-one correspondence. The directional rib 41 extends along the axial direction of the stapler and can extend into the directional groove 22, and the directional groove 22 can move along the extending direction of the directional rib 41, so that the clutch ring 2 can be together with the knob housing 4 It rotates, and the clutch ring 2 can move axially with respect to the knob housing 4. The orientation rib 41 provides a guidance for the orientation groove 22. Preferably, two orienting grooves 22 and orienting ribs 41 are provided respectively, and are symmetrically arranged to achieve the balance of the structure and the balance of the force. Of course, there may be multiple or asymmetrically arranged.

In other embodiments, the third mating portion may also include at least one directional rib located on the axial side of the clutch ring 2, and the fourth mating portion includes an directional groove corresponding to the directional rib one by one. The directional ribs extend along the axial direction of the stapler and extend into the directional groove, and the directional ribs can move along their extension direction, so that the clutch ring 2 can rotate together with the knob housing 4 and the clutch ring 2 can It moves axially relative to the knob housing 4.

Further, the inner surface of the knob housing 4 is provided with an L-shaped step portion 42, and the step portion 42 is located on the distal end surface of the clutch ring 2. The use of the step 42 can limit the movement of the clutch ring 2 toward the distal end of the stapler.

The circular tube type stapler provided by the invention has the following advantages:

The invention provides a knob assembly for a round tube-type stapler. The knob assembly is divided into a knob body and a clutch member. When the resistance of the knob body reaches the preset resistance value, rotating the clutch member can bring the knob body together Rotating, the knob body can drive the anvil assembly to move along the axial direction of the stapler and close to the staple cartridge. When the resistance of the knob reaches the preset resistance value, the clutch cannot drive the knob body to rotate, and the knob assembly enters the failure mode , The gap between the anvil assembly and the cartridge assembly remains unchanged, without causing the tissue to be over-squeezed.

The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For a person of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or replacements can be made, which should be regarded as falling within the protection scope of the present invention.

Claims

A knob assembly, characterized in that it is used for a round tube type stapler, and a screw rod is provided inside the stapler; the knob assembly includes:

A knob body, the knob body is sleeved on the outside of the screw rod, a drive member is provided on the knob body, a first fitting member is provided on a proximal end surface of the drive member, and the wire is driven when the knob body rotates The rod moves in the axial direction of the stapler;

The clutch member is located at the proximal end of the driving member, and the distal end surface of the clutch member has a second mating member corresponding to the first mating member, and the second mating member is relative to the axis of the first mating member When the second mating member is in contact with the first mating member, the rotation of the clutch member rotates the knob body;

A knob back cover is located at the proximal end of the knob body, and a compression spring is provided between the knob back cover and the proximal end surface of the clutch.
The knob assembly according to claim 1, wherein all of the fittings are convex.
The knob assembly according to claim 1, wherein the first fitting is a protrusion, and the second fitting is a groove.
The knob assembly according to claim 1, wherein the first fitting is a groove, and the second fitting is a protrusion.
The knob assembly according to any one of claims 2 to 4, wherein the first mating member includes a first side, and the second mating member includes a third side that cooperates with the first side , And the first side of the first fitting member is inclined toward the first direction.
The knob assembly according to claim 5, wherein the first fitting member further includes a second side surface, and the second fitting member further includes a fourth side surface that cooperates with the second side surface.
The knob assembly according to claim 6, wherein the second side surface of the first matching member is a right-angled surface, or the second side surface of the first matching member is inclined toward the second direction and the first matching member The inclination of the second side is smaller than that of the first side.
The knob assembly according to claim 7, wherein the first side face of the first matching piece and the third side face of the second matching piece are both flat or mating curved surfaces, and the first side of the first matching piece Both the second side and the fourth side of the second fitting are flat or matching curved surfaces.
The knob assembly according to claim 1, wherein the clutch member includes a clutch ring, and the clutch ring is sleeved on the outside of the knob body.
The knob assembly according to claim 1, wherein the side surface of the clutch member is provided with at least one directional groove, and the inner surface of the knob housing of the knob assembly is provided with directional ribs corresponding to the directional grooves in one-to-one correspondence , The directional rib extends in the axial direction of the stapler and extends into the directional groove.
The knob assembly according to claim 1, wherein at least one directional rib is provided on the side surface of the clutch member, and an inner surface of the knob housing of the knob assembly is provided with an directional groove corresponding to the directional rib , The directional rib extends in the axial direction of the stapler and extends into the directional groove.
The knob assembly according to claim 1, wherein the inner surface of the knob housing of the knob assembly is provided with a stepped portion, and the stepped portion is located on a distal end surface of the clutch member.
The knob assembly according to claim 1, wherein the distal end of the knob rear cover is provided with an internal thread of the rear cover, and the proximal end of the knob body is provided with an external body that cooperates with the internal thread of the rear cover Thread.
A round tube type stapler, characterized by comprising the knob assembly according to any one of claims 1 to 13.