RU2778732C1 - Trigger mechanism and stapler - Google Patents

Abstract

FIELD: medical equipment.

SUBSTANCE: invention relates to medical equipment, namely, to a trigger mechanism for a surgical stapler and to a surgical stapler. Trigger mechanism for a surgical stapler comprises a drive rod and a push button. The drive rod has a limiting groove, a trigger handle configured to rotate relative to the body of the stapler. Located in the trigger handle are a pin and a pin groove intended to accommodate the pin, and a return component is provided in the pin groove between the second end of the pin and the end surface of the pin groove, so that the pin is configured to move in a straight line in the direction defined by the pin groove. The first end of the pin is configured to protrude from the first end of the trigger handle and enter the limiting groove so as to prevent rotation of the trigger handle relative to the drive rod. The push button is configured to move in a first direction to press the first end of the pin so as to move the pin towards the second end of the trigger handle. When the trigger handle is pressed in the initial state, the trigger handle rotates from the second position to the first position; the pin rotates with the trigger handle; the first end of the pin moves distally until the first end of the pin enters the limiting groove so as to prevent the return rotation of the trigger handle to the second position. In the second implementation variant, the trigger mechanism for a surgical stapler comprises the above drive rod and a button assembly. The drive rod has a limiting groove, a trigger handle configured to rotate relative to the body of the stapler. The button assembly comprises a push rod. The first end of the push rod is inserted into the trigger handle. The push rod is configured to pass further into the trigger handle to press the first end of the pin so as to move the pin towards the second end of the trigger handle. The surgical stapler comprises one of the above trigger mechanisms. The inventions are characterised by the fact that when the stapler is not ready to be triggered, the pin is inserted into the limiting groove of the drive rod so as to prevent the rotation of the trigger handle, so that the trigger handle cannot return to the original position, since the trigger handle cannot be pushed to repeat rotation; the drive component of the trigger handle cannot push the drive rod, therefore the stapler cannot be actuated; only after the push button presses the pin to separate the pin from the limiting groove can the trigger handle rotate clockwise again to the second position, and then the trigger handle can be pushed again to activate the stapler.

EFFECT: creation of a surgical stapler equipped with an effective trigger mechanism.

17 cl, 22 dwg

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on International Patent Application No. PCT/CN2019/127100, which claims priority on the filing date of Chinese Patent Applications Nos. filed February 2, 2019, the entire contents of which are hereby incorporated by reference.

FIELD OF TECHNOLOGY

[0002] The present invention relates to the technology of medical instruments, in particular, to the trigger mechanism and stapler.

BACKGROUND OF THE INVENTION

[0003] A tumor of the digestive tract is one of the most common human diseases. During treatment, instead of the manual intervention of doctors, a stapler is widely used to stitch physiological tissues, such as tissues of the digestive tract. The linear stapler is a common surgical surgical instrument for linear stapling, which is used during surgery to stitch the tissues of the esophagus, stomach, intestines, etc.

[0004] A linear stapler typically includes a tool body and a head portion removably mounted on the tool body. The head can be passed through a small incision in the body through a trocar to get closer to the surgical site to perform the operation. Specifically, the tool body includes a trigger handle, and the detachable head includes a staple box and a staple head mounted at the distal end of the staple box. The staple box contains a trigger, and the staple head is configured to cut and staple tissue. The crank operated trigger assembly can drive the staple head to complete the cutting and suturing operation.

[0005] In the existing linear stapler before preparing the operation, the doctor may mistakenly press the trigger due to carelessness or lack of experience, then the stapler will work by mistake. This will adversely affect the operation and even harm the patients.

SUMMARY OF THE INVENTION

[0006] To solve the problems of the prior art, the present invention proposes a trigger mechanism and a stapler to realize that the operator cannot press the trigger handle to actuate the stapler when the finger is inserted into the restrictive groove.

[0007] In a first aspect of the present invention, there is provided a trigger for a stapler, comprising: a drive rod having a restrictive groove; a crank in which a finger is located, the first end of the finger being able to protrude from the first end of the crank and enter into a restrictive groove to prevent rotation of the crank relative to the drive rod; a push button movable in the first direction to press the first end of the finger to move it to the second end of the trigger.

[0008] In some embodiments, the trigger mechanism also includes a counterweight that includes a pivot part and a connecting part, wherein the counterweight connecting part is connected to a push button, and when the pivot part of the counterweight is rotated, the push button is driven.

[0009] In some embodiments, a finger groove is provided in the grip for receiving the finger, and a return component is provided between the second end of the finger and the finger groove so that the finger can move in a straight line in the direction defined by the finger groove.

[0010] In some embodiments, the return component is a compression spring.

[0011] In some embodiments, the finger comprises a first engagement portion and the push button comprises a second engagement portion, wherein when the push button is moved in the first direction, the first engagement portion depresses the second engagement portion so that the first end of the finger moves toward the second end of the trigger. handles.

[0012] In some embodiments, the first interaction part is a protrusion, including a restrictive part and a stepped part, and the second interaction part is a concave plate.

[0013] In some embodiments, the push button includes a push portion coupled to a second cooperating portion, the push portion extending through the body of the stapler.

[0014] In some embodiments, a push button restrictive component is installed in the body of the stapler, which is located in the path of movement of the push button moving in the first direction.

[0015] In some embodiments, the proximal end of the restrictive groove is in the form of an arcuate groove concave towards the interior of the drive shaft.

[0016] In some embodiments, the drive handle also has a drive component, and a toothed rack is installed on the side of the proximal end of the restriction groove, and a push tooth is installed on the side of the distal end of the restriction groove, and when the drive component is in contact with the push tooth, the drive component may push the drive rod to move it to the distal end of the stapler.

[0017] In a second aspect of the present invention, there is provided a trigger for a stapler, the trigger comprising: a drive rod having a stop groove, a start handle having a finger, the first end of which can protrude from the start handle and enter the stop groove to prevent rotation starting handle relative to the drive rod; a button assembly comprising a push rod, the first end of which is inserted into the trigger handle, wherein the push rod can further enter the trigger handle to press the first end of the finger to move it to the second end of the trigger handle.

[0018] In some embodiments, the finger includes a first interacting part that has a first inclined surface, while the first end of the push rod contains a second interacting part that has a third inclined surface, and when the push rod is in its original position, the third inclined surface coincides with the first inclined surface.

[0019] In some embodiments, the first engagement portion also has a second ramp located corresponding to the first ramp, and the second collaboration portion also has a fourth ramp corresponding to the third ramp, and when the push rod is in its home position, the fourth ramp docked with the second inclined surface.

[0020] In some embodiments, the intersection between the first inclined surface and the second inclined surface protrudes toward the first end of the finger, and a cavity is formed at the intersection between the third inclined surface and the fourth inclined surface, while the intersection between the first inclined surface and the second inclined surface enters the said cavity.

[0021] In some embodiments, the trigger handle is provided, respectively, with a finger groove for receiving a finger and a push rod guide groove for receiving a push rod, the finger groove extending in a third direction and the push rod guide groove extending in second direction.

[0022] In some embodiments, the button assembly also includes a connecting part and a guide rod, which is connected to the push rod through the connecting part, and the crank also has a button guide groove for accommodating the guide rod, and the first end of the guide rod is inserted into the guide groove for button.

[0023] In some embodiments, a sliding groove is also formed on the side of the button guide groove, and a clamping portion is formed at the first end of the guide rod, the clamping portion being disposed in the sliding groove.

[0023] In some embodiments, the button assembly also includes a connecting part and a button shaft that is connected to the push rod through the connecting part.

[0025] In some embodiments, the crank also has a mounting groove for accommodating the button shaft, in which the return spring for the button assembly is located.

[0026] In some embodiments, a finger groove is provided in the trigger handle to receive the finger, and a return component is installed between the second end of the finger and the finger groove so that the finger can move in a straight line in the direction defined by the finger groove.

[0027] In a third aspect of the present invention, there is provided a surgical stapler comprising a trigger according to the first or second aspect of the present invention.

[0028] The trigger and the surgical stapler have the following advantages.

[0029] The present invention provides a trigger for a stapler. The interaction between the pin and the drive rod implements a mechanism to protect the stapler from being actuated. After closing the stapler, the clinician needs to adjust the clamping state of the tissues in the staple head, such as flattening the tissues so that they are ready to actuate the stapler. Before the tissues reach a state of readiness to actuate the stapler, a finger is inserted into the restrictive groove of the drive shaft to limit the rotation of the start handle, while the drive component of the start handle cannot push the drive shaft to move it towards the drive shaft. The operator cannot press the trigger to actuate the stapler, which prevents the stapler from being actuated before the operation is prepared. When the button assembly is moved in the first direction, the finger can be pressed to separate from the restrictive groove and will not restrict the rotational movement of the trigger handle, while the trigger handle can be rotated so that the drive component can push the drive rod to drive the stapler.

[0030] In addition, in another embodiment of the present invention, the position of the finger can be switched by pressing the button assembly. The button assembly is disposed on the operating handle, and there is no need to specifically provide a separate structure for accommodating the button assembly, and the operator can only operate the operating handle with one hand, so that the button assembly is easy to use, which makes the operator's work easier.

[0031] The stapler made in accordance with the present invention is not limited to a linear stapler, but may also be other types of stapler.

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Embodiments of the present invention are described below, by way of example only, with reference to the accompanying schematic drawings. Obviously, the following drawings are only illustrative. For those skilled in the art, other drawings can be obtained according to the following drawings without creative effort.

[0033] FIG. 1 is a structural schematic view of a trigger mechanism interacting with a tool body, in accordance with one embodiment of the invention;

[0034] FIG. 2 is a structural schematic view of the trigger mechanism in the initial state, in accordance with one embodiment of the invention;

[0035] FIG. 3-4 are schematic views of a finger interacting with a push button and a rack, in accordance with one embodiment of the invention;

[0036] FIG. 5-6 are schematic views of a finger interacting with a push button, in accordance with one embodiment of the invention;

[0037] FIG. 7-8 are structural schematic views of a toothed rack in accordance with one embodiment of the invention;

[0038] FIG. 9-10 are structural schematic views of a trigger when the trigger is pressed, in accordance with one embodiment of the invention;

[0039] FIG. 11 is a structural schematic view of a trigger in a safe position, in accordance with one embodiment of the invention;

[0040] FIG. 12 is a structural schematic view of a firing mechanism in a ready to actuate position, in accordance with one embodiment of the invention;

[0041] FIG. 13 is a structural schematic view of a trigger according to another embodiment of the invention;

[0042] FIG. 14 is an exploded view of a crank and button assembly in accordance with another embodiment of the invention;

[0043] FIG. 15 is a structural schematic view of a crank cooperating with a button assembly, in accordance with another embodiment of the invention;

[0044] FIG. 16 is a side view of a crank engaging a button assembly, in accordance with another embodiment of the invention;

[0045] FIG. 17 is a sectional view along line A'-A' of FIG. 16;

[0046] FIG. 18 is a perspective view of a drive shaft according to another embodiment of the invention;

[0047] FIG. 19 is a structural schematic view of an actuating rod according to another embodiment of the invention;

[0048] FIG. 20-22 are structural schematic views of a crank, in accordance with another embodiment of the invention.

DETAILED DESCRIPTION

[0049] The embodiments of the present invention are described below, by way of example only, with reference to the accompanying schematic drawings, in accordance with the embodiments of the present invention, so that the purpose of the invention, the solution of the technical problem, and the advantages are more clear. It should be understood that the described embodiments are only part of the embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0050] The present invention is described in detail below in conjunction with the schematic drawings and embodiments.

[0051] In order to solve the technical problem of the existing technology, the present invention proposes a trigger mechanism for the stapler. The trigger mechanism includes a drive rod having a restrictive groove, a start handle having a first position, and a push button. A finger is installed in the starting handle, which has a first state and a second state. When the finger is in the first state and the start handle is in the first position, the first end of the finger protrudes from the first end of the start handle and enters the limit groove, and the start handle cannot be rotated relative to the drive rod to return to the initial state. When the push button is moved in the first direction, it depresses the first end of the finger to move to the second end of the crank, so that the finger enters the second state from the first state. The present invention also provides a stapler containing a trigger. The stapler is not limited to a linear stapler, but may also be another type of stapler.

[0052] Thus, in the trigger mechanism according to the present invention, the interaction between the pin and the drive shaft realizes the triggering protection of the stapler. Before the stapler reaches the actuation-ready state, the pin is in the first state, and is inserted into a stop groove on the drive rod to prevent the crank from turning to return to its original position. At this time, the crank drive component and the drive rod cannot act on each other even if the crank is pressed, and the drive rod cannot be pushed to move it to the distal end of the stapler, so the operator cannot press the crank to bring the stapler into action, thereby erroneous actuation of the stapler will be prevented. Therefore, when the finger is in the first state, the stapler is in a safe state and cannot be driven normally. When moving in the first direction, the push button presses the finger to move out of the restrictive groove, after which the finger no longer prevents the crank from turning.

[0053] The design of the trigger mechanism in each embodiment is described below in conjunction with the schematic drawings.

[0054] FIG. 1-12 are structural schematic views of the trigger mechanism and its components made in accordance with the first embodiment of the present invention. In this embodiment, the trigger mechanism includes a drive rod 5, a crank 3, and a push button 8. The drive rod 5 has a stop groove 53. The crank 3 has a first position and a second position. The finger 6 having the first state and the second state is installed in the crank 3. When the finger 6 is in the first state and the crank 3 is in the first position, the first end 61 of the finger 6 protrudes from the first end 31 of the crank 3 and enters the limit groove 53, and the handle 3 cannot rotate relative to the drive rod 5. When the push button 8 is moved in the first direction, it presses the first end 61 of the finger 6 to move it to the second end 32 of the crank 3, so that the finger 6 enters the second state from the first state. In this embodiment, the first direction is direction B shown in FIG. 4. In this embodiment, when the finger 6 is in the second state, it is retracted to the second end 32 of the crank 3 to separate from the stop groove 53.

[0055] FIG. 1 is a schematic view of a trigger mechanism cooperating with a tool body made in accordance with this embodiment. The drive rod 5 is made in the body 1 of the tool, and the distal end of the drive rod 5 is connected to the pushing unit of the cutting element. The drive shaft 5 has a third position and a fourth position, with the third position on the side of the proximal end of the fourth position. When the drive rod 5 moves from the fourth position towards the distal end of the stapler, the cutting element pushing assembly can be extended to drive the stapler. The tool body 1 comprises a fixed handle 2, wherein the first end 31 of the crank 3 is rotatably connected to the tool body 1, and the return component for the crank 3 is positioned between the crank 3 and the tool body 1. The return component for the crank 3 may be an extension spring, a torsion spring, a compression spring, etc. When pressed by the operator, the crank 3 can move relative to the tool body 1 in the direction A shown in FIG. 1. The position of the starting handle 3 shown in FIG. 1 represents the second position, at which time the trigger is in the rest state. When the operator presses the start handle 3 and the second end 32 of the start handle 3 rotates towards the fixed handle 2, the start handle 3 enters the first position. When the operator releases the start handle 3, it, under the action of the return component for the start handle 3, can rotate in the opposite direction to direction A, while the second end 32 of the start handle 3 rotates away from the fixed handle 2, and the start handle 3 returns to the second position.

[0056] In the present invention, the positions of the distal end and the proximal end are defined relative to the operator, with the proximal end being the end closer to the operator and the distal end being the other end farther from the operator and closer to the surgical site. For example, in terms of FIG. 1, the distal end of the instrument body 1 is the left end, and the proximal end of the instrument body 1 is the right end.

[0057] FIG. 2, in accordance with an embodiment of the present invention, is a structural schematic view of the trigger mechanism in the initial state. At this time, the starting handle 3 is in the second position, and the finger 6 is in the first state. In this embodiment, the crank 3 has a finger groove 33 in which the finger 6 is located. The finger 6 can only move in the direction defined by the groove 33, and between the second end 62 of the finger 6 and the finger groove 33 is a finger return component 7 6. In this embodiment, the return component 7 for the pin 6 is a compression spring. When the finger 6 is pressurized from the side of the push button 8 towards the second end 32 of the crank 3, the finger 6 enters the second state from the first state. At the same time, the second end 62 of the pin 6 presses the compression spring to deform it. That is, the first state of the finger 6 is a protruding state, the second state of the finger is a retracted state. When the push button 8 is moved in the opposite direction to the first direction, it no longer presses the pin 6, then the pin 6 returns to the first state under the action of the return force of the compression spring deformation.

[0058] As shown in FIG. 3-6, in this embodiment, the trigger also includes a counterweight 9. The counterweight 9 includes a pivot part 91 and a connecting part 92 which is rigidly connected to the push button 8, and the pivot part 91 is rotatably connected to the fixed handle 2. When the pivot part 91 rotates in the first direction, the push button 8 is driven to move in the first direction. The counterweight 9 can also be pivotally connected to the tool body 1 . For example, in the tool body 1, a rotary shaft is made, and the counterweight 9 is enclosed in a casing outside the rotary shaft. The present invention is not limited to this, however, in other alternative embodiments, the counterweight 9 may also use other types of fastening structure.

[0059] Thus, in the embodiment, when the counterweight 9, the push button 8 and the finger 6 interact, moving the push button 8 can switch the state of the finger 6. When moving, the button 8 always moves around the counterweight 9, and the push button 8 has no displacement in the axial direction of the counterweight 9 relative to the body 1. Therefore, the structural stability of the entire trigger mechanism is improved and the trigger mechanism becomes more comfortable for the operator.

[0060] As shown in FIG. 3-6, in the embodiment, the first interaction part 63 and the second interaction part 81 are provided on the finger 6 and the push button 8, respectively. When the push button 8 is moved in the first direction, the first interaction part 63 presses the second interaction part 81 so that that the first end 61 of the finger 6 moves towards the second end 32 of the crank 3.

[0061] In an embodiment, the first cooperating portion 63 is a protrusion having a restrictive portion 631 and a stepped portion 632. The second cooperating portion 81 is a concave plate cooperating with the restrictive portion 631. From the point of view of FIG. 4, the restriction portion 631 is located on top of the stepped portion 632, with the restriction portion 631 directly interacting with the second interacting part 81. In an alternative embodiment, the first interacting part 63 may be a protrusion, and the second interacting part 81 may also be a protrusion. In another alternative embodiment, the first interaction part 63 may be a protrusion of a different shape, and the second interaction part 81 is a concave plate. In another alternative embodiment, the first engagement portion 63 may be a concave plate and the second engagement portion 81 may be a protrusion. The first cooperating part 63 and the second cooperating part 81 may also be other types of structures, all of which are included within the protection scope of the present invention. When the counterweight 9 rotates in the first direction, the push button 8 is driven to move in the first direction, the concave plate of the push button 8 presses the protrusion of the pin 6 and pushes the compression spring 7 in an oblique downward direction, so the first end 61 of the pin 6 moves to the second end 32 of the crank 3, and the finger 6 enters the second state from the first state.

[0062] The push button 8 has a push portion 82 connected to the second cooperating portion 81. The push portion 82 extends through and protrudes from the body of the stapler. In an embodiment, there are two pressing parts 82 extending respectively through two sides of the tool body 1 . Moreover, the body of the stapler has a stop member 11 for the push button 8, where the stop member 11 is located in the movement path of the push button 8 in the first direction to restrict movement of the push button 8 in the first direction. Each pressing portion 82 also has an operator's finger location 821 so that the operator can work comfortably from either side of the housing.

[0063] As shown in FIG. 7 and FIG. 9, the proximal end of the limit groove 53 has an arcuate groove 52 concave towards the inside of the drive shaft 5. When the pin 6 is in the first state and the crank 3 is rotated from the second position to the first position, the arcuate groove 52 engages with the first end 61 of the pin 6 and guides the first end 61 of the pin 6 to enter the restrictive groove 53.

[0064] In an embodiment, the crank 3 also includes a drive component 4, wherein, in the embodiment, the drive component 4 is a spike, and the bottom of the drive bar 5 has a rack 51 and a push tooth 54. The rack 51 is located on the side of the proximal end of the push tooth 54, and between the toothed rack 51 and the pushing tooth 54, a smooth part 58 is made. The toothed rack 51 and the pushing tooth 54 can, in various states, respectively, interact with the drive element 4 of the starting handle 3. In the initial state, the drive rod 5 is in the third position , and when the trigger 3 is rotated from the second position to the first position, the drive component 4 is in contact with the pushing tooth 54 and pushes the drive rod 5 to move towards the distal end of the stapler to enter the fourth position. When the drive rod 5 is in the fourth position and the crank 3 rotates from the second position to the first position, the drive component 4 is in contact with the rack 51 and also pushes the drive rod 5 to move to the distal end of the stapler to push the cutting element pushing assembly , so the stapler fires.

[0065] Next, with reference to FIG. 9-12 describe in detail the structures of the trigger mechanism in various states of this embodiment.

[0066] In the initial state, as shown in FIG. 2, the first end 61 of the pin 6 protrudes from the crank 3 and is located in the area corresponding to the rack 51, and the drive component 4 is located in the smooth part 58.

[0067] FIG. 9 and FIG. 10 respectively show two positions of the crank 3 during rotation from the second position to the first position when the crank 3 is pressed to close the stapler. During this process, the drive rod 5 is driven to move from the third position to the fourth position. On FIG. 9 shows a state in which the crank 3 is slightly pressed and the finger 6 is in the first state. Although the pin 6 is slightly compressed by the arcuate groove 52, the first end 61 of the pin 6 still protrudes from the crank 3. In FIG. 10 shows the state in which the crank 3 is pressed to the maximum extent, the finger 6 is still in the first state, and the finger 6 has already begun to move to the most distal end of the arcuate groove 52. That is, when the crank 3 is rotated from the second position to the first position, the first end 61 of the finger 6 is guided by the arcuate groove 52 to gradually move towards the limit groove 53. At this time, if the handle 3 is kept pressed, as shown in FIG. 11, it rotates to the first position, and the driving component 4 comes into contact with the pushing tooth 54, while, if the handle 3 continues to be pressed, it can push the driving rod 5 by the interaction of the driving component 4 and the pushing tooth 54 to move it to distal end of the stapler. The driving rod 5 moves in direction C and enters the fourth position, and the pin 6 enters the limit groove 53.

[0068] At this time, when the drive rod 5 is pushed to the fourth position, if the crank 3 returns to the second position, the position of the drive component 4 will correspond to the position of the rack 51. When the operator continues to press the crank 3 to move it from the second position to the first position, the drive component 4 will also push the rack 51 to move towards the distal end of the stapler to drive it. However, before the operation is prepared, if the operator presses the trigger 3 by mistake, the stapler will be erroneously actuated. Therefore, in this embodiment, in the state shown in FIG. 10, when the first end 61 of the pin 6 is inserted into the limit groove 53, the limit groove 53 restricts the rotation of the pin 6 and restricts the return rotary movement of the start handle 3. The start handle 3 cannot return to the second position from the first position shown in FIG. 11, and the operator cannot press the start handle 3 again, so erroneous actuation before the preparation of the operation is prevented.

[0069] In the state shown in FIG. 11, if the push button 8 is pressed down, it rotates in the first direction around the pivot portion 91 of the counterweight 9 to cause the first end 61 of the pin 6 to move towards the second end 32 of the handle 3. The first end 61 of the pin 6 separates from the stop groove 53 of the drive rod 5, so that the limit groove 53 no longer restricts the rotation of the handle 3. At this time, if the operator releases the handle 3, it can return to the second position under the return function of the return component for the handle 3, so as to enter the state shown in FIG. 12. After the handle 3 is reset, the push button 8 can be released and the finger 6 returns to the first state.

[0070] FIG. 12 is a structural schematic view of the firing mechanism in the ready to actuate position, in accordance with this embodiment. At this time, the drive rod 5 is in the fourth position, and the drive component 4 of the handle 3 cooperates with the rack 51. If the handle 3 is pressed, it rotates from the second position to the first position in direction A. The drive component 4 will push the drive rod 5 through rack 51 to move towards the distal end of the stapler to actuate it. To prevent the first end 61 of the pin 6 from creating excessive resistance to the rotation of the handle 3, a groove 511 is also provided in the part of the rack 51 interacting with the first end 61 of the pin 6 so that the first end 61 of the pin 6 can move towards the distal end of the rack 51 along the groove. 511 toothed rack.

[0071] In another embodiment, the present invention provides a trigger for a stapler. The trigger mechanism includes a drive rod, a trigger handle and a button assembly. The starter handle has a safety finger. When the trigger is pressed, the finger enters the limit groove made on the drive rod, so the trigger cannot be rotated, and the stapler is in a safe state at this time to prevent erroneous actuation before the operation is prepared. The button assembly is provided on one side of the trigger handle remote from the fixed handle, and the button assembly can switch finger states due to the interaction between the button assembly and the finger. After the operation is set up, the clinician may press the button assembly towards the trigger handle so that the button assembly presses the finger to enter the inside of the trigger handle and separate from the stop groove. The crank can then be turned normally, the stapler is in a ready-to-operate state, and the stapler can be started normally by pressing the crank.

[0072] In another embodiment, the present invention provides a crosslinker comprising the aforementioned trigger. It is possible to prevent the stapler from being erroneously actuated before the operation is prepared due to the interaction between the safety finger of the trigger handle and the stop groove of the drive rod. Finger states can be switched using the button assembly located on the trigger handle. When the button node is pressed, the stapler can operate normally. The stapler is not limited to a linear stapler, but may also be other types of stapler, such as an arc stapler, etc.

[0073] The trigger structure of another embodiment of the present invention will also be described with reference to FIG. 13-22. Fig. 13 depicts the construction of a trigger mechanism interacting with the stapler. As shown in FIG. 13, the starting handle is not pressed, while the button assembly is in its original position. The drive rod 5 is made in the tool body 1, the fixed handle 2 and the starting handle 3 are made on one side of the tool body 1. As shown in FIG. 13-19, the stop groove 53 is formed on the drive shaft 5, and the pin 6 is installed in the handle 3. When the pin 6 does not enter the stop groove 53, the handle 3 can be rotated relative to the fixed handle 2, towards or away from the fixed handle 2. In the initial state, the handle 3 is in a position remote from the fixed handle 2. After pressing the handle 3, it rotates to a position close to the fixed handle 2. The finger 6 has a first state and a second state. When the pin 6 is in the first state, the first end 61 of the pin 6 enters the limit groove 53, then the handle 3 cannot be rotated relative to the drive bar 5, so the relative position between the handle 3 and the drive bar 5 is limited, and the stapler is in a safe state. . When the pin 6 is in the second state, the first end 61 of the pin 6 is separated from the restrictive groove 53 and does not block the rotational movement of the trigger 3, while the stapler is in a ready-to-operate state. The button assembly 10 used to switch the states of the finger 6 is provided on one side of the handle 3. The button assembly 10 is preferably located on the side of the handle 3 that is away from the fixed handle 2 in order to facilitate the operation by the physician. The button assembly 10 includes a push bar 71, the first end of the push bar 71 being inserted into the start handle 3. When the button assembly 10 is in the home position and the start handle 3 is pressed, the first end 61 of the pin 6 enters the limit groove 53. At this time, if the handle 3 is released, it cannot return to its original position under the influence of the finger 6. When the button assembly 10 is pressed in the direction of the trigger handle 3, it moves as a whole from its original position in the direction of the handle 3, so that the push rod 71 further enters the handle 3, the push bar 71 presses the pin 6 to force the first end 61 of the pin 6 to move to the second end 32 of the crank 3, and then the pin 6 enters the second state from the first state, that is, the first end 61 of the pin 6 separates from the stop groove 53 , and the handle 3 simultaneously returns to its original position under the action of the return component.

[0074] As shown in FIG. 14-17, the trigger 3 is provided with a finger groove 33 for receiving the pin 6 and a guide groove 34 for receiving the push rod 71. The finger groove 33 extends in the third direction 85, and the guide groove 34 extends in the second direction 83, wherein the groove 33 under the finger and the guide groove 34 intersect each other. As shown in FIG. 17, the third direction approximately extends in the longitudinal direction of the crank 3, the second direction 83 is perpendicular or approximately perpendicular to the third direction 85. The intersection between the finger groove 33 and the guide groove 34 is the interface between the first interaction part 63 of the finger 6 and the second interaction part 72 of the push rod 71, the push rod 71 and the pin 6 intersect each other at the intersection position of said two grooves, so that the pressure can be transferred from the push rod 71 to the pin 6. The pin 6 can only move in a straight line, along the direction of passage of the finger groove 33 , to switch between the first state and the second state. The push rod 71 can only move in the direction of the guide groove 34.

[0075] In this embodiment, pin 6 includes a first engagement portion 63 having a first sloping surface 531. The first end of the push rod 71 includes a second engagement portion 72 having a third sloping surface 721. When the push rod 71 is in its home position, the third sloping surface 721 is mated with the first ramp 531. When the push rod 71 further enters the trigger 3 from its original position, the first ramp 531 slides on the third ramp 721 so that the first end 61 of the pin 6 moves to the second end 32 of the trigger 3 From the point of view of FIG. 17, the first inclined surface 531 is inclined upward from the right side to the left side. The inclined direction of the third inclined surface 721 coincides with the inclined direction of the first inclined surface 531, that is, the upward slope from the right side to the left side. When the push rod 71 further enters the start handle 3 in the direction from the right side to the left side, the third ramp 721 presses the first ramp 531 down, the first cooperating part 63 causes the finger 6 to move entirely towards the second end 32 of the start handle 3.

[0076] In addition, the first cooperating part 63 may also have a second inclined surface 532 disposed in correspondence with the first inclined surface 531. The second cooperating portion 72 may also have a fourth inclined surface 722 disposed in correspondence with the third inclined surface 721. When pressing the pin 71 is in its home position, the fourth ramp 722 mates with the second ramp 532. From the point of view of FIG. 17, the second inclined surface 532 is inclined upward from the left side to the right side, and the inclined direction of the fourth surface 722 is the same as the inclined direction of the second surface 532, that is, it is inclined upward from the left side to the right side.

[0077] As shown in FIG. 17, the intersection 81 between the first ramp 531 and the second ramp 532 protrudes toward the first end 61 of the pin 6, a cavity 723 is formed at the intersection between the third ramp 721 and the fourth ramp 722. When the push bar 71 is in its home position, the intersection between the first inclined surface 531 and the second inclined surface 532 enters the cavity 723. Therefore, when the button assembly 10 is not pressed, the first interaction part 63 and the second interaction part 72 cannot move relative to each other, while the stability of the push bar 71 in its the initial position when the button assembly 10 is not pressed improves.

[0078] As shown in FIG. 14-17, in order to better guide the button assembly 10 when pressed and prevent the button assembly 10 from separating from the trigger handle 3 when the push rod 71 is in its rest position, the button assembly 10 may also include a connecting portion 76 and a guide rod 73. The guide rod 73 is connected with the push rod 71 through the connecting part 76. The guide groove 35 for the button to accommodate the guide rod 73 is made in the start handle 3, and the first end of the guide rod 73 is inserted into the guide groove 35. In the embodiment, there are two guide rods 73, there are also two guides grooves 35, each guide rod 73 being an elastic guide rod. When the guide rods 73 are in the initial state, the distance between the two guide rods 73 when they are open outward is larger than the distance between the two guide grooves 35. elastic deformation, to a certain extent, towards the middle to ensure that the guide rods 73 can be inserted into the two guide grooves 35. After the rods 73 are inserted into the two grooves 35, the rods 73 can be held in two grooves 35. To further improve the stability of the guide rod 73 and prevent accidental separation of the rods 73 from the guide grooves 35, a clamp portion 731 is also formed at the first end of the rod 73, and a sliding groove 341 for the clamp portion 731 is formed on the side surface of the guide groove 35. When the rod 73 is inserted into groove 35, clamping i part 731 is inserted into the sliding groove 341 to limit the movement of the clamping part 731. Therefore, the rod 73 can only move in a straight line along the direction of passage of the guide groove 35. When the rod 71 is in its original position, under the action of the clamping and limiting function of the clamping part 731 in the guide groove 35 of the button, the button assembly 10 is not separated from the crank 3.

[0079] In order to realize the automatic reset of the button assembly 10 after being pressed, the button assembly 10 also includes a connecting part 76 and a button shaft 74. The button shaft 74 is connected to the push rod 71 through the connecting part 76, and the starting handle 3 is provided with an installation groove 36 of the button shaft to accommodate the button shaft 74. The button return spring 75 is located in the mounting groove 36. When the button assembly 10 is moved from its home position to the actuating handle 3, to actuate the push rod 71 to further enter the handle 3, the return spring 75 buttons are deformed. After the external force applied to the button assembly 10 is released, the deformation restoring force pushes the button assembly 10 away from the handle 3 in order to force the button assembly 10 to return to its original position. A shaft sleeve 37 is also installed in the button shaft mounting groove 36, with the button shaft 74 passing through the sleeve 74. Therefore, during the movement process of the button assembly 10 in the button shaft installation groove 36, the button assembly 10 moves more smoothly.

[0080] In addition, in order to realize the automatic reset of the finger 6, a finger return component is also provided between the second end 62 of the finger 6 and the finger groove 33. This return component may be a return spring 75 for the finger.

[0081] As shown in FIG. 18 and FIG. 19, the proximal end of the limit groove 53 has an arcuate groove 52 concave towards the inside of the drive shaft 5. When the handle 3 is pressed, it rotates from its original position to the fixed handle 2, the arcuate groove 52 engages with the first end 61 of the finger 6 and guides the first end 61 of the pin 6 to enter the limit groove 53 to prevent collision between the first end 61 of the pin 6 and the drive rod 5 when they are in contact with each other so that the first end 61 of the pin 6 moves along the drive rod 5 more smoothly.

[0082] As used herein, the positions of the distal end and the proximal end are defined relative to the operator, with the proximal end being the end closer to the operator and the distal end being the other end further away from the operator and closer to the surgical site. For example, in terms of FIG. 13, the distal end of the instrument body 1 is the left end, and the proximal end of the instrument body 1 is the right end. From the point of view of FIG. 19, the distal end of the drive shaft 5 is the left end, and the proximal end of the drive shaft 5 is the right end.

[0083] In addition, the driving rod 5 on the side of the distal end of the limiting groove 53 also has a pushing tooth, and the pushing tooth 54 can cooperate with the driving component, and in this embodiment, the driving component is a sharp protrusion 4 provided on the driving handle 3, and the specific interaction method is described in detail below. The drive rod 5 on the side of the proximal end of the restrictive groove 53 also has a toothed rack 51 that can cooperate with a sharp protrusion 4 formed on the crank 3, and the specific method of interaction is described in detail below. The middle portion of the rack 51 may be provided with a groove 511 for realizing a retreat effect towards the first end 61 of the pin, the retreat method being described in detail below.

[0084] Next, the trigger state when the finger 6 is in the first state will be described with reference to FIG. 13, Fig. 20 and FIG. 21. FIG. 13 shows the design of the stapler in its original state. The finger 6 and the crank 3 are in the initial state, and the second end 32 of the crank 3 is away from the fixed handle 2. In the state shown in FIG. 13, the drive rod 5 is in its original position. At this time, if the start handle 3 is pressed, it rotates towards the fixed handle 2 to approach the fixed handle 2 to enter the state shown in FIG. 20. In this embodiment, at this time, the crank 3 is pressed and the button assembly 10 is in the home position. At this time, the sharp protrusion 4 of the trigger 3 is in contact with the pushing tooth 54 on the drive rod 5 and pushes the pushing tooth 54 towards the distal end of the stapler, while the tooth 54 drives the drive rod 5 to move to the distal end of the stapler, then there is a driving rod 5 moves in the direction B shown in FIG. 20. The drive rod 5 then moves some distance from its original position towards the distal end of the stapler. At this time, under the action of the pin return spring 7, the first end 61 of the pin 6 is guided by the arcuate groove 52 to enter the limit groove 53 of the drive rod 5 and enter the first state. At this time, even if the starting handle 3 is released, it cannot return to its original position under the action of the limiting function of the pin 6 and the limiting groove 53. At this time, the stapler cannot be actuated and is in a safe state.

[0085] After the physician completes preparations for surgery, as shown in FIG. 21, in this embodiment, the crank is pressed and the button assembly is pressed down. The button assembly 10 is pressed in the direction C shown in FIG. 21, the push rod 71 further enters the start handle 3. Under the pressure of the push rod 71, the finger 6 moves towards the second end 32 of the start handle 3 and enters the second state from the first state, while the first end 61 of the finger 6 separates from the stop groove 53 and enters the state shown in FIG. 21. At this time, the starting handle 3 can be rotated to return to the original position shown in FIG. 22, under the action of a return component (such as a return spring) for the handle 3, then the handle 3 returns to its original state and the button assembly is in its original position. After the handle 3 returns to its original position, the position of the spike 4 corresponds to the position of the rack 51 of the drive bar 5. At this time, when the button assembly 10 is released, it returns to its original position under the action of the button return spring 75. Also provided is a return component 7 for the pin 6, wherein in this embodiment the return component 7 is a return spring 7 for the pin. Under the action of the return spring 7, the first end 61 of the finger 6 moves away from the second end 32 of the handle 3 and protrudes from the first end 31 of the handle 3 again. comes into contact with the groove 511 of the rack, and the groove 511 of the rack realizes the retreat of the first end 61 of the pin 6. Then the sharp projection 4 of the handle 3 comes into contact with the rack 51 and pushes the rack 51 so that the drive rod moves to the distal end of the stapler for putting it into action.

[0086] The trigger and stapler made in accordance with the present invention have the following advantages.

[0087] The present invention provides a trigger for a stapler. The interaction between the pin and the drive rod realizes the actuation protection mechanism. After closing the stapler, the clinician needs to adjust the clamping state of the tissues in the staple head, such as flattening the tissues so that they are ready to be actuated. Before the fabrics are ready to be actuated, the finger is inserted into the stop groove of the drive rod to limit the rotation of the start handle, then the drive component of the start handle cannot push the drive rod to move towards the drive rod. The operator cannot press the trigger to actuate the stapler to prevent the stapler from being actuated before the operation is prepared. When the button assembly is moved in the first direction, the finger can be pressed to separate from the restrictive groove and will not restrict the rotational movement of the trigger handle, while the trigger handle can be rotated so that the drive component can push the drive rod to drive the stapler. In addition, in another embodiment of the present invention, the position of the finger can be switched by pressing the button assembly. The button assembly is located on the handle, and there is no need to specially provide a separate structure to accommodate the button assembly, and the doctor can only operate the handle with one hand, and the button assembly is easy to use, which makes the doctor's work easier. The stapler made in accordance with the present invention is not limited to a linear stapler, but may also be other types of stapler.

[0088] The above is a detailed description of the present invention in connection with specific preferred embodiments, and specific embodiments of the invention are not limited to the description. Modifications and substitutions may be made without departing from the spirit and scope of the present invention.

Claims (24)

1. A trigger for a surgical stapler, comprising: a drive rod having a restrictive groove, a trigger handle rotatable relative to the body of the stapler, wherein a finger and a finger groove for accommodating the finger are located in the trigger handle, and in the finger groove between the second end of the finger and the end surface of the finger groove is located a returnable component such that the finger is movable in a straight line in a direction defined by the finger groove, wherein the first end of the finger is operable to protrude from the first end of the trigger handle and engage in a restrictive groove to prevent rotation of the trigger handle relative to the drive rod, a push button movable in a first direction to press the first end of the finger to move it to the second end of the trigger handle, while pressing the start handle in the initial state, the start handle is rotated from the second position to the first position, the finger is rotated together with the start handle, the first end of the finger moves distally until the first end of the finger enters the restrictive groove to prevent the start handle from turning back to the second position. 2. The trigger according to claim 1, further comprising a counterweight, which includes a rotary part and a connecting part, and the connecting part of the counterweight is connected to a push button, while the push button is configured to be driven when the rotary part of the counterweight is rotated. 3. The trigger according to claim. 1, in which the finger contains the first interacting part, and the push button contains the second interacting part, and the second interacting part is configured to press the first interacting part when the push button is moved in the first direction to move the first end of the finger to the other end of the starting handle. 4. The trigger mechanism according to claim 3, wherein the first interaction part is a protrusion containing a restrictive part and a stepped part, and the second interaction part is a concave plate. 5. The trigger mechanism of claim 3, wherein the push button comprises a push portion coupled to a second cooperating portion, the push portion extending through the body of the stapler. 6. The trigger mechanism of claim. 5, wherein the stapler body is provided with a push button restrictive component that is located in the path of movement of the push button in the first direction. 7. The firing mechanism of claim. 1, wherein the proximal end of the restrictive groove has an arcuate groove concave towards the inside of the drive rod. 8. Trigger for a surgical stapler, comprising: a drive rod having a restrictive groove, a trigger handle rotatable relative to the body of the stapler, wherein a finger is located in the trigger handle, a finger groove for accommodating the finger, and in the finger groove between the second end of the finger and the end surface of the finger groove is located a returnable component such that the finger is movable in a straight line in a direction defined by the finger groove, wherein the first end of the finger is operable to protrude from the first end of the trigger handle and engage in a restrictive groove to prevent rotation of the trigger handle relative to the drive rod, a button assembly comprising a push rod, wherein the first end of the push rod is inserted into the trigger handle, moreover, the push rod is configured to further enter the trigger handle to press the first end of the finger to move it to the second end of the trigger handle, while pressing the trigger handle in the initial state, the trigger handle is rotated from the second position to the first position, the finger is rotated together with the trigger handle, the first end of the finger moves distally until the first end of the finger enters the restrictive groove to prevent rotation of the trigger handle back to the second position. 9. The trigger according to claim 8, in which the finger contains the first interacting part, which has a first inclined surface, and the first end of the push rod contains a second interacting part, which has a third inclined surface, while the third inclined surface is made with the possibility of docking with the first inclined surface when the pressure rod is in its original position. 10. The trigger according to claim 9, in which the first interacting part further has a second inclined surface located in accordance with the first inclined surface, and the second interacting part further has a fourth inclined surface located in accordance with the third inclined surface, and the fourth inclined surface made with the possibility of docking with the second inclined surface when the pressure rod is in its original position. 11. The trigger according to claim 10, in which the intersection between the first inclined surface and the second inclined surface protrudes towards the first end of the pin, and a cavity is formed at the intersection between the third inclined surface and the fourth inclined surface, while the intersection between the first inclined surface surface and the second inclined surface enters the cavity. 12. The firing mechanism of claim 8, wherein the trigger handle has a push rod guide groove for receiving the push rod, the finger groove extending in a third direction and the push rod guide groove extending in a second direction. 13. The trigger according to claim 8, wherein the button assembly further comprises a connecting part and a guide rod, which is connected to the push rod through the connecting part, and in the trigger handle there is a button guide groove for accommodating the guide rod, and the first end of the guide the rod is inserted into the guide groove for the button. 14. The firing mechanism according to claim 13, wherein a sliding groove is formed on the side of the guide groove for the button, and a clamp portion is formed at the first end of the guide rod, which is placed in the sliding groove. 15. The firing mechanism of claim 8, wherein the button assembly further comprises a connecting part and a button shaft that is connected to the push rod through the connecting part. 16. The trigger mechanism according to claim 15, in which an installation groove is additionally made in the starting handle for accommodating the button shaft, in which the return spring for the button assembly is located. 17. Surgical stapler containing the trigger according to claim 1 or 8.

Images