Gun head safety mechanism and intracavitary cutting stapler using the same

Abstract

The present invention discloses a gun head safety mechanism and an intracavitary cutting stapler using the same, comprising: a gun head connector, a rotary lock and a lock rotation assembly, wherein the gun head connector is used to connect the gun body of the instrument; the rotary lock is rotatably sleeved on the gun head connector; the lock rotation assembly comprises a locking block suitable for plugging and matching with the rotary lock to prevent the rotary lock from rotating relative to the gun head connector, and an axial pushing block connected to the locking block to drive the locking block to move axially along the gun head connector. The present invention can avoid the technical problem of the rotating movable block being triggered by mistake before the gun head structure of the instrument is matched with the gun body structure.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a gun head safety mechanism and an intracavitary cutting stapler using the same. Background Art

[0002] At present, laparoscopic cutting and staplers are widely used as one of the instruments in minimally invasive surgery, mainly used for tissue resection, transection and anastomosis in open surgery in abdominal surgery, gynecology, pediatrics and thoracic surgery. Since the development of surgical operations, there has been an increasing tendency towards minimally invasive surgery. In a broad sense, operations that can reduce trauma are called minimally invasive surgeries, and minimally invasive surgeries in a narrow sense generally refer to operations performed under endoscopes. Endoscopic surgery generally only requires opening a few small holes in the patient's body, and inserting the resected and sutured tissues and auxiliary instruments into the patient's body through the small holes for surgery. Minimally invasive surgery causes less trauma to patients, and patients can recover in a very short time, so minimally invasive surgery is receiving more and more attention.

[0003] For the intracavitary cutting stapler, when installing the staple cartridge assembly, the pusher rod may not be concentric and may not enter the connecting sleeve. In order to effectively ensure that the pusher rod can enter the connecting sleeve, a positioning mechanism for installing the staple cartridge assembly will be set in the intracavitary cutting stapler. One type of positioning mechanism is an axial push method, which easily causes the problem that the cutting knife assembly cannot be pulled back after firing. Another type of positioning mechanism is to convert the axial push into a rotational motion. In this case, the structure can exist in two states. The staple cartridge assembly can also be moved by hand, so that the positioning mechanism is rotated to the final state position. In this case, clinically, the staple cartridge assembly cannot be installed on the gun head. Summary of the invention

[0004] The first object of the present invention is to provide a gun head safety mechanism to solve the technical problem of effectively avoiding the erroneous triggering of the rotating movable block before the installation of the nail magazine assembly.

[0005] A second object of the present invention is to provide an intracavitary cutting stapler to solve the technical problem of effectively avoiding erroneous triggering of a rotating movable block before installation of a staple cartridge assembly.

[0006] The gun head safety mechanism of the present invention is applicable to an intracavitary cutting stapler and is implemented as follows:

[0007] A gun head safety mechanism, comprising:

[0008] A gun head connector, the gun head connector is used to connect to the instrument gun body;

[0009] A rotating lock buckle, which is rotatably mounted on the gun head connector;

[0010] The locking and rotating stop assembly comprises a locking block adapted to be plugged into and matched with the rotating locking block to prevent the rotating locking block from rotating relative to the gun head connector, and an axial pushing block connected to the locking block to drive the locking block to move axially along the gun head connector.

[0011] In a preferred embodiment of the present invention, the axial push block and the locking block are arranged along the axial direction of the gun head connector; and

[0012] A first receiving groove adapted to receive the axial push block and a second receiving groove communicated with the first receiving groove and adapted to receive the locking block are provided on the gun head connector along its axial direction;

[0013] The end of the locking block connected to the axial pushing block is suitable for moving from the second accommodating groove to the first accommodating groove, and the end of the axial pushing block connected to the locking block is suitable for moving from the first accommodating groove to the second accommodating groove.

[0014] In a preferred embodiment of the present invention, a convex hook suitable for hooking on the edge of the axial end of the rotary lock is also convexly provided on the end of the axial pushing block away from the locking block.

[0015] In a preferred embodiment of the present invention, a movable groove communicating with the second receiving groove is hollowed out on the gun head connector;

[0016] The end of the locking block away from the axial pushing block is inserted into the movable groove; and

[0017] A return spring is embedded in the movable groove;

[0018] One end of the return spring abuts against a groove wall opposite to an end of the movable groove and the locking block inserted in the movable groove, and the other end of the return spring abuts against an end of the locking block inserted in the movable groove.

[0019] In a preferred embodiment of the present invention, the groove width of the movable groove is greater than the groove width of the second accommodating groove; and

[0020] A stopper is integrally provided at the end of the locking block inserted into the movable groove, and the width of the stopper is greater than the width of the second accommodating groove.

[0021] In a preferred embodiment of the present invention, the thickness of the locking block on the radial surface relative to the gun head connector is greater than the thickness of the axial push block on the radial surface relative to the gun head connector; that is,

[0022] An L-shaped step portion is formed at the junction of the locking block and the axial pushing block.

[0023] In a preferred embodiment of the present invention, the end of the rotary lock buckle facing the locking block is further provided with a notch suitable for the locking block to be embedded; and

[0024] The L-shaped step portion is suitable for abutting against the wall surface of the notch and the locking block facing each other.

[0025] In a preferred embodiment of the present invention, a stopper suitable for being embedded in the gun head connector is convexly provided on the rotating lock buckle; and

[0026] A limiting groove suitable for cooperating with a limiting block is also provided on the gun head connector along the rotation track of the rotating lock buckle.

[0027] In a preferred embodiment of the present invention, a pair of matching parts are further provided at one end of the rotary lock away from the locking block along the axial direction of the gun head connector.

[0028] The intracavitary cutting stapler of the present invention is realized as follows:

[0029] An intracavitary cutting stapler comprises: the gun head safety mechanism and an instrument gun body suitable for matching with the gun head connector.

[0030] By adopting the above technical scheme, the present invention has the following beneficial effects: the gun head safety mechanism of the present invention and the intracavitary cutting stapler using the same, through the cooperation of the locking buckle rotation stop assembly and the rotary lock, the locking block of the locking buckle rotation stop assembly can form a locking effect on the rotation of the rotary lock relative to the gun head connecting head before the instrument gun head and the gun body are matched. Only when the instrument gun head and the gun body are matched, the axial pushing block is pushed by the gun body to release the locking effect of the locking block on the rotary lock, the rotary lock can be rotated relative to the gun head connecting head, that is, the locking block plays a role in protecting the rotation of the rotary lock, thereby avoiding the rotation triggering of the rotary lock in the wrong state, and then effectively ensuring the positioning accuracy of the nail magazine assembly under the premise of being installed in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of the rotating lock of the gun head safety mechanism of this embodiment in a state where it cannot rotate;

[0032] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0033] Figure 3 It is a schematic structural diagram of the rotating lock of the gun head safety mechanism of this embodiment in a rotating state;

[0034] Figure 4 It is a structural schematic diagram of the axial push block and the locking block of the gun head safety mechanism of this embodiment;

[0035] Figure 5It is a schematic structural diagram of the limit groove of the gun head connecting head of the gun head safety mechanism of this embodiment;

[0036] Figure 6 It is a structural schematic diagram of the first receiving groove, the second receiving groove and the movable groove of the gun head safety mechanism of this embodiment;

[0037] Figure 7 It is a schematic structural diagram of the rotating lock buckle of the gun head safety mechanism of this embodiment from a first perspective;

[0038] Figure 8 It is a schematic structural diagram of the rotating lock buckle of the gun head safety mechanism of this embodiment from a second viewing angle;

[0039] Fig. 9 It is a schematic diagram of the matching structure of the rotating lock buckle of the gun head safety mechanism and the cutting knife assembly of this embodiment.

[0040] In the figure: a gun head connector 1, a rotating lock buckle 2, a locking block 3, an axial pushing block 5, a first accommodating groove 6, a second accommodating groove 7, a convex hook 8, a movable groove 9, a return spring 10, a convex column 11, a stop portion 12, a matching portion 13, a limit block 14, and a limit groove 15. DETAILED DESCRIPTION

[0041] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0042] Embodiment 1:

[0043] See also Figures 1 to 9 As shown, this embodiment provides a gun head safety mechanism, which is suitable for an intracavitary cutting stapler, comprising: a gun head connector 1 for connecting to a gun body of the instrument, a rotary lock 2 rotatably sleeved on the gun head connector 1, and a lock and rotation stop assembly suitable for locking the rotary lock 2. Specifically, the rotary lock 2 can rotate around the circumferential outer wall of the gun head connector 1. The lock and rotation stop assembly comprises a locking block 3 suitable for plugging and cooperating with the rotary lock 2 to prevent the rotary lock 2 from rotating relative to the gun head connector 1, and an axial pushing block 5 connected to the locking block 3 to drive the locking block 3 to move axially along the gun head connector 1.

[0044] It should be noted that, during the assembly of the gun head (the gun head includes the stapler assembly) and the gun body of the intracavitary cutting stapler, the gun head is first inserted into the gun body, and when the gun head is axially assembled in place relative to the gun body, the gun head is rotated relative to the gun body until it is circumferentially assembled in place. In this embodiment, the gun head connector 1 is limited by the provided rotating lock 2, so that when the rotating lock 2 is not rotated relative to the gun head connector 1, the gun head and the gun body cannot be assembled in place.

[0045] In more detail, the axial push block 5 and the locking block 3 are arranged along the axial direction of the gun head connector 1; and a first receiving groove 6 suitable for receiving the axial push block 5 and a second receiving groove 7 connected with the first receiving groove 6 and suitable for receiving the locking block 3 are provided on the gun head connector 1 along its axial direction; the end of the locking block 3 connected to the axial push block 5 is suitable for moving from the second receiving groove 7 to the first receiving groove 6, and the end of the axial push block 5 connected to the locking block 3 is suitable for moving from the first receiving groove 6 to the second receiving groove 7. Here, the first receiving groove 6 and the second receiving groove 7 have the same groove width, and the corresponding axial push block 5 and the locking block 3 also have the same width. Under such a structure, the axial push block 5 can move freely from the first receiving groove 6 to the second receiving groove 7, and similarly, the locking block 3 can move freely from the second receiving groove 7 to the first receiving groove 6.

[0046] In addition, it should be noted that a convex hook 8 suitable for hooking on the edge of the axial end of the rotary lock catch 2 is also provided at the end of the axial push block 5 away from the locking block 3. The provision of the convex hook 8 prevents the axial push block 5 from being separated from the rotary lock catch 2 during the axial movement of the gun head connector 1.

[0047] Considering the automatic reset process of the axial push block 5 and the locking block 3, the present embodiment further hollows out a movable groove 9 connected to the second accommodating groove 7 on the gun head connector 1; the end of the locking block 3 away from the axial push block 5 is inserted into the movable groove 9; and a reset spring 10 is embedded in the movable groove 9; specifically, one end of the reset spring 10 abuts against the groove wall of the movable groove 9 opposite to the end of the locking block 3 inserted in the movable groove 9, and the other end of the reset spring 10 abuts against the end of the locking block 3 inserted in the movable groove 9. That is to say, in the process of driving the locking block 3 to move toward the side of the reset spring 10 under the premise of the axial push block 5 being pushed, the reset spring 10 is in a compressed state, and when the pushing force on the axial push block 5 is released, the reset action of the reset spring 10 can reset the locking block 3 and the axial push block 5.

[0048] In an optional implementation, in order to effectively maintain the effective contact state between the reset spring 10 and the locking block 3, the locking block 3 of this embodiment is also integrally provided with a boss 11 suitable for being inserted into the connecting hole of the reset spring 10 at the end facing the reset spring 10. Of course, it should be noted here that the axial length of the boss 11 is less than the slot length of the movable slot 9.

[0049] In addition, in order to prevent the locking block 3 from being disengaged from the movable groove 9 during the axial movement of the axial pushing block 5 along the gun head connector 1, the groove width of the movable groove 9 provided in this embodiment is greater than the groove width of the second receiving groove 7; and a stopper 12 is integrally provided at the end of the locking block 3 inserted into the movable groove 9, and the width of the stopper 12 is greater than the width of the second receiving groove 7. That is to say, no matter what state the locking block 3 is in, the stopper 12 will not be disengaged from the movable groove 9.

[0050] It should also be noted that the specific locking cooperation between the locking block 3 and the rotating lock buckle 2 of this embodiment is achieved as follows:

[0051] Specifically, the thickness of the locking block 3 on the radial surface relative to the gun head connector 1 is greater than the thickness of the axial push block 5 on the radial surface relative to the gun head connector 1; that is, an L-shaped step portion 18 is formed at the junction of the locking block 3 and the axial push block 5. In this state, the axial push block 5 is located between the rotary lock buckle 2 and the gun head connector 1. At this time, mainly from the radial surface of the gun head connector 1, that is, a fitting gap along the radial surface of the gun head connector 1 is formed between the rotary lock buckle 2 and the gun head connector 1, and the fitting gap can just accommodate the axial push block 5, but the thickness of the locking block 3 is greater than the axial push block 5, that is, the locking block 3 cannot be accommodated in the fitting gap formed between the rotary lock buckle 2 and the gun head connector 1. The end of the rotary lock buckle 2 facing the locking block 3 is also provided with a notch 16 suitable for the locking block 3 to be embedded; and the L-shaped step portion 18 is suitable for abutting against the wall surface facing the notch 16 and the locking block 3. That is, when the locking block 3 is partially embedded in the notch 16 , the locking block 3 at this time forms an obstacle to the rotation of the rotary lock 2 relative to the gun head connector 1 .

[0052] Considering the cooperation with the gun body of the instrument, the rotary lock 2 of this embodiment is provided with a pair of matching parts 13 along the axial direction of the gun head connector 1 at one end of the rotary lock 2 away from the locking block 3. The matching parts 13 are mainly used to match with the gun body when the gun body and the gun head are matched.

[0053] Finally, it should be noted that a stopper 14 suitable for being embedded in the gun head connector 1 is also provided on the rotating lock buckle 2; and a stopper groove 15 suitable for cooperating with the stopper block 14 is also provided on the gun head connector 1 along the rotating track of the rotating lock buckle 2. The length of the stopper groove 15 here is greater than the length of the stopper block 14, that is, the rotating track of the rotating lock buckle 2 is limited by the length of the stopper groove 15.

[0054] Regarding the limit block 14 of this embodiment, the limit block 14 is suitable for being embedded in the prefabricated slot 17 on the cutting knife group 20 after passing through the limit groove 15, that is, the limit block 14 can be matched with the slot 17 and released from the slot 17 by rotating, so as to realize the insurance function of the rotary lock 2 for the cutting knife group 20 during the rotation process. Specifically, when the gun head connector is not connected to the gun body, the limit block 14 on the rotary lock 2 is just embedded in the slot 17 of the cutting knife group 20. With the assembly of the gun head connector and the gun body, the limit block 14 gradually leaves the slot 17 of the cutting knife group 20 during the normal rotation of the rotary lock 2 relative to the gun head connector 1, and in this process, the rotary lock 2 releases the limit insurance for the cutting knife group 20.

[0055] The specific implementation principle of the gun head safety mechanism of this embodiment is as follows:

[0056] When the gun tip connector 1 is not connected to the gun body, a part of the locking block 3 is embedded in the notch of the rotating lock catch 2, so that the locking block 3 can form an obstruction to the rotation of the rotating lock catch 2 relative to the gun tip connector 1. When the gun tip connector 1 is assembled with the gun body, due to the pushing effect of the gun body on the axial push block 5 connected to the locking block 3, the locking block 3 moves away from the axial push block 5 under the action of the axial push block 5, so that the part of the locking block 3 itself embedded in the notch of the rotating lock catch 2 is withdrawn from the rotating lock catch 2, that is, the obstruction of the locking block 3 on the rotating lock catch 2 is released, and the rotating lock catch 2 can rotate normally relative to the gun tip connector 1. In summary, when the gun tip connector 1 is not assembled with the gun body, the rotating lock catch 2 is not easily triggered by mistake and causes a rotation process relative to the gun tip connector 1.

[0057] Embodiment 2:

[0058] Based on the gun tip safety mechanism of Example 1, this embodiment provides an intracavitary cutting stapler, comprising: the gun tip safety mechanism of Example 1, and an instrument gun body suitable for matching with the gun tip connector 1.

[0059] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0060] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0063] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0064] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A gun tip safety mechanism, suitable for an intracavitary cutting stapler, characterized in that: include: A gun head connector, the gun head connector is used to connect to the instrument gun body; A rotating lock buckle, which is rotatably mounted on the gun head connector; A lock buckle rotation stop assembly, the lock buckle rotation stop assembly comprising a locking block adapted to be plugged into and matched with the rotary lock buckle to prevent the rotary lock buckle from rotating relative to the gun head connector, and an axial push block connected to the locking block to drive the locking block to move axially along the gun head connector; the axial push block and the locking block are arranged axially along the gun head connector; A first receiving groove adapted to receive the axial push block and a second receiving groove communicated with the first receiving groove and adapted to receive the locking block are provided on the gun head connector along its axial direction; The end of the locking block connected to the axial push block is suitable for moving from the second receiving groove to the first receiving groove, and the end of the axial push block connected to the locking block is suitable for moving from the first receiving groove to the second receiving groove; The gun head connector is also hollowed out with a movable groove that is connected to the second receiving groove; the end of the locking block away from the axial pushing block is inserted into the movable groove; A return spring is embedded in the movable groove; one end of the return spring abuts against the groove wall of the movable groove opposite to the end of the locking block inserted in the movable groove, and the other end of the return spring abuts against the end of the locking block inserted in the movable groove; the groove width of the movable groove is greater than the groove width of the second accommodating groove; A stopper is integrally provided at the end of the locking block inserted into the movable groove, and the width of the stopper is greater than the width of the second accommodating groove; the thickness of the locking block at the radial surface relative to the gun head connector is greater than the thickness of the axial push block at the radial surface relative to the gun head connector; that is, an L-shaped step portion is formed at the junction of the locking block and the axial push block; The end of the rotating lock buckle facing the locking block is also provided with a notch suitable for the locking block to be embedded; and the L-shaped step portion is suitable for abutting against the wall surface facing the notch and the locking block; A limiting block suitable for being embedded in the gun head connector is also convexly provided on the rotating lock buckle; and a limiting groove suitable for cooperating with the limiting block is also provided on the gun head connector along the rotating track of the rotating lock buckle.

2. The gun head safety mechanism according to claim 1, characterized in that: A convex hook suitable for hooking on the edge of the axial end of the rotary lock is also convexly provided at one end of the axial pushing block away from the locking block.

3. The gun head safety mechanism according to claim 1, characterized in that: A pair of matching parts are also provided along the axial direction of the gun head connector at one end of the rotating lock buckle away from the locking block.

4. An intracavitary cutting stapler, characterized in that: It comprises a gun head safety mechanism as described in any one of claims 1 to 3, and an instrument gun body suitable for matching with the gun head connector.

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