End effector and surgical instrument

Abstract

The present application relates to a kind of end effector and surgical instrument, including anvil assembly, staple cartridge assembly support and the closed drive component of driving staple cartridge assembly support, anvil assembly relative movement to enable end effector to close or open, end effector further include the connecting rod of connecting staple cartridge assembly support and anvil assembly, connecting rod includes first rod body part and second rod body part articulated with it, first rod body part has the articulated end away from second rod body part, second rod body part has the sliding end away from first rod body part, the side wall of one of staple cartridge assembly support and anvil assembly is provided with sliding groove extending along the longitudinal direction of end effector, the other is provided with articulated portion, the articulated end of first rod body part is connected with articulated portion, the sliding end of second rod body part is arranged in sliding groove and it can move relative to sliding groove, when end effector is closed, first rod body and second rod body are collinear.Simple structure, convenient operation.

Description

TECHNICAL FIELD

[0001] The present application relates to an end effector and surgical instrument, belonging to the technical field of medical instruments. BACKGROUND

[0002] In the surgical treatment of general surgery, surgical instruments are surgical tools in medical operations, and an anastomat is a surgical tool commonly used to complete the cutting and anastomosis function of the tissue, which is a device used in medicine to replace manual suturing, and its main working principle is to use titanium nails (suture nails) to cut or anastomose the tissue, which is similar to a stapler. However, the anastomat of the prior art has the following disadvantages: when closing the target tissue in the operation, the front end of the anastomat is a cantilever structure, which makes the anastomat have poor rigidity. When the anastomat is closing a larger target tissue, it will be subjected to pressure from other parts of the target tissue, causing the anastomat to deform and the jaws to flip over. The prior art structure is complex, and a lot of manual force is required to overcome the flipping of the jaws, and the reliability is not high, and the force control is not easy to grasp. SUMMARY

[0003] The purpose of the present application is to provide an end effector and surgical instrument which can prevent the jaws from flipping over and has a simple structure and is easy to operate.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an end effector, comprising an anvil assembly, a cartridge assembly support arranged opposite to the anvil assembly, and a closure drive assembly for driving the relative movement of the cartridge assembly support and the anvil assembly to close or open the end effector, the end effector further comprising a connecting rod connecting the cartridge assembly support and the anvil assembly, the connecting rod comprising a first rod body portion and a second rod body portion, the first rod body portion and the second rod body portion being hinged, the first rod body portion having a hinged end away from the second rod body portion, the second rod body portion having a sliding end away from the first rod body portion, a sliding groove extending in the longitudinal direction of the end effector being formed on the side wall of one of the cartridge assembly support and the anvil assembly, the other of the cartridge assembly support and the anvil assembly being provided with a hinged portion, the hinged end of the first rod body portion being connected to the hinged portion, the sliding end of the second rod body portion being arranged in the sliding groove and being movable relative to the sliding groove, and the first rod body and the second rod body being collinear when the end effector is closed.

[0005] Further, a roller is arranged on the sliding end and arranged in the sliding groove.

[0006] Furthermore, the staple cartridge assembly bracket includes a frame portion for mounting the staple cartridge assembly and a connecting portion extending rearward from the frame portion. The closure drive assembly includes a closure shaft, the connecting portion of the staple cartridge assembly bracket is movably mounted on the closure shaft, and the staple cartridge assembly bracket moves along the longitudinal direction of the closure shaft. When the anvil assembly applies a thrust to the frame portion of the staple cartridge assembly bracket, the connecting portion of the staple cartridge assembly bracket can swing relative to the closure drive assembly in a first direction, the first direction being the direction of the force exerted by the anvil assembly on the staple cartridge assembly bracket.

[0007] Furthermore, the closing drive assembly also includes a closing nut disposed on the closing shaft, the closing nut being threadedly connected to the closing shaft, the connecting end having a mounting hole, the closing nut being inserted into the mounting hole, and the closing nut and the mounting hole having a clearance fit.

[0008] Furthermore, the end effector also includes a cutting assembly fired by a firing rod for cutting the target tissue.

[0009] Furthermore, the cutting assembly includes a firing nut disposed on the firing rod and a blade disposed on the firing nut.

[0010] Furthermore, the blade has a cutting edge that is positioned opposite to the firing lever.

[0011] Furthermore, the firing rod has a threaded section and a smooth rod extending along the threaded section, and the cutting assembly is threadedly connected to the threaded section.

[0012] Furthermore, the firing nut is disposed on the threaded section.

[0013] The present invention also provides a surgical instrument, including a handle and a working head, the working head including an end effector as described above.

[0014] The beneficial effects of this invention are as follows: By providing a connecting rod for connecting the staple cartridge assembly support and the anvil assembly, the connecting rod includes a first rod body and a second rod body hinged to the first rod body. The first rod body has a hinged end away from the second rod body and is disposed on one of the staple cartridge assembly support and the anvil assembly. The second rod body has a sliding end away from the first rod body and is disposed on a sliding groove. The sliding end of the second rod body is disposed in the sliding groove and can move relative to the sliding groove. When the end effector is closed, the first and second rod bodies are collinear. When the first and second rod bodies are collinear, a dead point is reached. At this time, the effective rotational torque of the connecting rod due to the pressure of the target tissue is zero, thereby preventing the end effector from overturning, reliably ensuring the consistency of the staple height, and effectively ensuring the quality and safety of the surgery.

[0015] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the surgical instrument shown in Embodiment 1 of the present invention.

[0017] Figure 2 for Figure 1 A cross-sectional view of the mid-end actuator when it is open.

[0018] Figure 3 for Figure 1 A cross-sectional view of the actuator when it is closed. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention. The above, below, left, right, front, and rear positional relationships described below are... Figure 1 As a reference point, in Figure 1 The middle arrow 'aa' points up and down, while the arrow 'bb' points forward and backward.

[0020] Please see Figures 1 to 3 The surgical instrument shown in one embodiment of the present invention is an electrically driven stapler (hereinafter referred to as the stapler), which is used for suturing and cutting tissue. The stapler includes a gun body and a staple cartridge assembly 100 mounted on the gun body. The gun body includes a handle (not shown) and a working head 10. In this embodiment, the handle is a reusable and sterilizable electric handle, which is provided with a quick connector and a signal transmission port. The handle also contains a replaceable battery pack for providing power and a power input device (not shown) for inputting power, which includes a motor. The connection method between the motor and the battery is a conventional design in the prior art, and therefore will not be described in detail here. The working head 10 is driven by the handle to perform actions such as closing, opening, and firing.

[0021] The working head 10 comprises a housing 1, a center support (not shown), a closure transmission assembly (not shown), a firing transmission assembly (not shown), a switching component (not shown), and an end effector 2. The center support is fixed in the housing 1, the closure transmission assembly and the firing transmission assembly are enclosed in the housing 1, one end of the closure transmission assembly and the firing transmission assembly is connected with the motor through a power transmission assembly (not shown), and the other end of the closure transmission assembly and the firing transmission assembly is connected with the end effector 2 and supported by the center support. The closure transmission assembly and the firing transmission assembly are connected with the handle portion to transmit the power of the handle portion to the end effector 2, so that the closure, firing, firing reset and opening of the end effector 2 are driven by the closure transmission assembly and the firing transmission assembly. The closure transmission assembly, the firing transmission assembly, the switching component and the center support are conventional designs in the art, and therefore will not be described in detail here.

[0022] The end effector 2 comprises an anvil assembly 21, an opposite cartridge assembly support 22 arranged relative to the anvil assembly 21, and a closure drive assembly for driving the cartridge assembly support 22 and the anvil assembly 21 to move relative to each other to close or open the end effector. The opening or closing of the end effector 2 is completed by the anvil assembly 21 and the cartridge assembly support 22 forming a jaw, and the closing of the jaw is the closing of the end effector 2, and the opening of the jaw is the opening of the end effector 2. In this embodiment, the anvil assembly 21 is fixedly arranged, and the closure drive assembly is connected with the cartridge assembly support 22 to drive the cartridge assembly support 22 to move relative to the anvil assembly 21.

[0023] The anvil assembly 21 comprises an anvil support 211 and an anvil head 212 arranged at the end of the anvil support 211, and the anvil head 212 is snap-connected with the anvil support 211. The cartridge assembly support 22 is a cantilever structure, which comprises a frame portion 221 for fixing the cartridge assembly and a connecting portion 222 extending rearward from the frame portion 221 to connect the frame portion 221 and the closure drive assembly, and the frame portion 221 comprises a top wall 2211 and side walls 2212 extending downward from both sides of the top wall 2211.

[0024] The end effector further comprises a cutting assembly 4 which is fired by the firing rod 3 and used to cut target tissue, the cutting assembly 4 comprises a firing nut 42 arranged on the firing rod 3 and a blade 41 arranged on the firing nut 42. The blade 41 has a cutting edge surface and a back surface arranged opposite to the cutting edge surface, and the cutting edge surface is arranged opposite to the firing rod 3. The firing rod 3 has a threaded section and a light pole part extending along the threaded section, and the cutting assembly 4 is threadedly connected with the threaded section. More specifically, the firing nut 42 is arranged on the threaded section. In the embodiment, the cutting assembly 4 is arranged on the anvil assembly 21, and the anvil assembly 21 is fixedly arranged, and the cartridge assembly support 22 moves relative to the anvil assembly 21. Of course, in other embodiments, the cartridge assembly support 22 is fixedly arranged, and the anvil assembly 21 moves relative to the cartridge assembly support 22, and the cutting assembly 4 is arranged on the cartridge assembly support 22, which is not limited herein.

[0025] The closure drive assembly comprises a closure shaft 51, and the connecting portion 222 of the cartridge assembly support 22 is movably arranged on the closure shaft 51, and the cartridge assembly support 22 moves on the closure shaft 51 along the longitudinal direction of the closure shaft 51. When the anvil assembly 21 exerts a pushing force on the frame portion 221 of the cartridge assembly support 22, the connecting portion 222 of the cartridge assembly support 22 can swing relative to the closure drive assembly in a first direction, and the first direction is the direction of the force exerted by the anvil support 211 on the cartridge assembly support 22. When the surgical instrument clamps and cuts tissue, the cartridge assembly support 22 will be subjected to a force in the first direction, and thus will swing in the first direction (i.e., the a-a direction). The source of the pushing force is the force generated when the surgical instrument clamps and cuts tissue, one of which is the pushing force generated by squeezing tissue, and the other is the force generated by suturing and cutting tissue.

[0026] The closure drive assembly further comprises a closure nut 52 arranged on the closure shaft 51, and the closure nut 52 is threadedly connected with the closure shaft 51. The connecting portion 222 has a mounting hole, and the closure nut 52 is inserted into the mounting hole, and the closure nut 52 and the mounting hole are in clearance fit. The closure shaft 51 and the closure transmission assembly are provided with a conical transmission gear set, and the conical transmission gear set comprises a first bevel gear 61 arranged on the closure transmission assembly and a second bevel gear 62 arranged on the closure shaft 51 and engaged with the first bevel gear 61.

[0027] The end effector 2 further comprises a connecting rod 7 connecting the staple cartridge assembly holder 22 and the anvil assembly 21, the connecting rod 7 comprising a first rod body 71 and a second rod body 72, the first rod body 71 and the second rod body 72 being hinged, the first rod body 71 having a hinged end 711 away from the second rod body 72, the second rod body 72 having a sliding end 721 away from the first rod body 71, one of the staple cartridge assembly holder 22 and the anvil assembly 21 being provided with a sliding groove 2213 extending along the longitudinal direction of the end effector on the side wall 2212 thereof, the other of the staple cartridge assembly holder 22 and the anvil assembly 21 being provided with a hinge part 213, the hinged end 711 of the first rod body 71 being connected with the hinge part 213, the first rod body 71 being able to swing left and right relative to the hinged end 711. The sliding end 721 of the second rod body 72 is arranged in the sliding groove 2213 and is able to move relative to the sliding groove 2213, when the end effector is closed, the first rod body 71 and the second rod body 72 are collinear to reach a dead point position, at this time, the effective turning moment of the connecting rod 7 under the pressure of the target tissue is zero, thereby preventing the end effector 2 from overturning, effectively ensuring the quality and safety of the operation. In the embodiment, the sliding grooves 2213 are arranged on the side walls 2212 of the two sides of the staple cartridge assembly holder 22, the connecting rod 7 is provided with two, and the sliding end 721 of the second rod body 72 of each connecting rod 7 is slidingly connected with the sliding groove 2213. The anvil assembly 21 is provided with the hinge part 213, and the hinged end 711 of the first rod body 71 is hinged with the hinge part 213. By arranging the sliding grooves 2213 on the two sides of the staple cartridge assembly holder 22 and connecting with the connecting rod 7, the end effector 2 is effectively prevented from being unevenly stressed. The sliding end 721 is provided with a roller, the roller is arranged in the sliding groove 2213, and the second rod body 72 slides in the sliding groove 2213 through the roller, so as to reduce the friction.

[0028] In summary: by arranging the connecting rod 7 for connecting the staple cartridge assembly holder 22 and the anvil assembly 21, the connecting rod 7 comprising the first rod body 71 and the second rod body 72 hinged with the first rod body 71, the first rod body 71 having the hinged end 711 away from the second rod body 72 and being arranged on one of the staple cartridge assembly holder 22 and the anvil assembly 21, the second rod body 72 having the sliding end 721 away from the first rod body 71 and being arranged on the sliding groove 2213, the sliding end 721 of the second rod body being arranged in the sliding groove 2213 and being able to move relative to the sliding groove 2213, when the end effector is closed, the first rod body and the second rod body are collinear. When the first rod body 71 and the second rod body 72 are collinear to reach the dead point position, at this time, the effective turning moment of the connecting rod 7 under the pressure of the target tissue is zero, thereby preventing the end effector 2 from overturning, effectively ensuring the quality and safety of the operation.

[0029] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as there is no conflict, any combination of the technical features should be considered within the scope of the present disclosure.

[0030] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An end effector for a surgical instrument, comprising an anvil assembly, a cartridge assembly support disposed relative to the anvil assembly, and a closure drive assembly for driving relative movement of the cartridge assembly support and the anvil assembly to close or open the end effector, characterized in that, The end effector further includes a connecting rod connecting the staple cartridge assembly bracket and the anvil assembly. The connecting rod includes a first rod portion and a second rod portion, which are hinged together. The first rod portion has a hinged end away from the second rod portion, and the second rod portion has a sliding end away from the first rod portion. A sliding groove extending along the longitudinal direction of the end effector is formed on the side wall of one of the staple cartridge assembly bracket and the anvil assembly. A hinge portion is provided on the other of the staple cartridge assembly bracket and the anvil assembly. The hinged end of the first rod portion is connected to the hinge portion, and the sliding end of the second rod portion is disposed in the sliding groove and can move relative to the sliding groove. When the end effector is in a fully closed state, the first rod and the second rod extend to a collinear state, forming a dead-point locking structure to prevent the staple cartridge assembly bracket from overturning relative to the anvil assembly under tissue pressure. Furthermore, a roller is provided on the sliding end, and the roller is disposed in the sliding groove.

2. The end effector for surgical instruments as described in claim 1, characterized in that, The staple cartridge assembly bracket includes a frame portion for mounting the staple cartridge assembly and a connecting portion extending rearward from the frame portion. The closure drive assembly includes a closure shaft. The connecting portion of the staple cartridge assembly bracket is movably mounted on the closure shaft, and the staple cartridge assembly bracket moves along the longitudinal direction of the closure shaft. When the anvil assembly applies a thrust to the frame portion of the staple cartridge assembly bracket, the connecting portion of the staple cartridge assembly bracket can swing relative to the closure drive assembly in a first direction, where the first direction is the direction of the force exerted by the anvil assembly on the staple cartridge assembly bracket.

3. The end effector for surgical instruments as described in claim 2, characterized in that, The closing drive assembly also includes a closing nut disposed on the closing shaft. The closing nut is threadedly connected to the closing shaft. The connecting part has a mounting hole. The closing nut is inserted into the mounting hole, and there is a clearance fit between the closing nut and the mounting hole.

4. The end effector for surgical instruments as claimed in claim 1, characterized in that, The end effector also includes a cutting assembly fired by a firing rod for cutting the target tissue.

5. The end effector for surgical instruments as described in claim 4, characterized in that, The cutting assembly includes a firing nut disposed on the firing rod and a blade disposed on the firing nut.

6. The end effector for surgical instruments as described in claim 5, characterized in that, The blade has a cutting edge, which is positioned opposite to the firing lever.

7. The end effector for surgical instruments as described in claim 5, characterized in that, The firing rod has a threaded section and a smooth rod extending along the threaded section, and the cutting assembly is threadedly connected to the threaded section.

8. The end effector for surgical instruments as claimed in claim 7, characterized in that, The firing nut is disposed on the threaded section.

9. A surgical instrument, comprising a handle and a working head, characterized in that, The working head includes an end effector as claimed in any one of claims 1 to 8.

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