Automatic stapler

Abstract

The present invention discloses an automatic stapler, comprising: a main housing, a rack, a shifting member, a fixed driving wheel, a movable handle, a firing gear set meshing with the fixed driving wheel to drive the rack to feed, and a retracting gear set meshing with the fixed driving wheel to drive the rack to retract; the fixed driving wheel and the shifting member are rotatably connected to the main housing through a gear shaft, the movable handle is used to drive the fixed driving wheel to rotate, the firing gear set and the retracting gear set are fixed to the shifting member and are respectively located on both sides of the fixed driving wheel; a retracting switch that drives the shifting member to rotate to only make the retracting gear set mesh with the rack is provided at the first end of the rack, and a firing switch that drives the shifting member to rotate to only make the firing gear set mesh with the rack is provided at the second end of the rack. The automatic stapler provided by the present invention can automatically switch between firing and retracting, avoiding manual pulling back of the retracting knife to involve tissue.

Description

Technical Field

[0001] The invention relates to the field of surgical medical instruments, and in particular to an automatic stapler. Background Art

[0002] Laparoscopic linear cutting stapler is mainly used by medical institutions for resection, transection and anastomosis of lung, stomach and intestinal tissues during laparoscopic surgery. Laparoscopic linear cutting stapler is a commonly used medical device in surgery. It is favored and praised by clinical surgeons at home and abroad because of its simple operation, fast suturing and few side effects and surgical complications.

[0003] After completing the cutting, the current stapler stays in the firing position. If it continues to fire, there is a risk of the cutting blade breaking, or the instrument itself being damaged, or the blade not being able to be pulled back, causing fatal injuries to the patient. Secondly, in order to complete the blade retraction operation, it must be pulled back manually, which requires two hands and is not convenient. At the same time, there is a risk of pulling the tissue due to clamping the tissue during the pulling back operation.

[0004] Therefore, how to simplify the retraction of the stapler and reduce the risk of pulling tissue is a problem that needs to be solved by technical personnel in this field. Summary of the invention

[0005] The object of the present invention is to provide an automatic stapler which can automatically switch between firing and retracting the knife, thereby avoiding the involvement of tissues when manually pulling back the knife.

[0006] To achieve the above object, the present invention provides an automatic stapler, comprising: a main housing, a rack, a shifting member, a fixed driving wheel, a movable handle, a firing gear set meshing with the fixed driving wheel to drive the rack to feed, and a retracting gear set meshing with the fixed driving wheel to drive the rack to retract;

[0007] The fixed driving wheel and the shifting member are rotatably connected to the main housing via a gear shaft, the movable handle is used to drive the fixed driving wheel to rotate, and the firing gear set and the knife retracting gear set are fixed to the shifting member and are respectively located on both sides of the fixed driving wheel;

[0008] A retract switch is provided at the first end of the rack to drive the shift member to rotate until only the retract gear set is engaged with the rack, and a firing switch is provided at the second end of the rack to drive the shift member to rotate until only the firing gear set is engaged with the rack.

[0009] Optionally, the main housing includes a fixed handle, and when the movable handle rotates toward the fixed handle, the fixed driving wheel rotates counterclockwise; when the movable handle is reset away from the fixed handle, the fixed driving wheel remains stationary.

[0010] Optionally, the fixed driving wheel is a flywheel, and the movable handle is fixedly connected to the inner ring of the flywheel via a shaft sleeve.

[0011] Optionally, the number of gears in the firing gear set is 2N, the number of gears in the retracting gear set is 2N-1, and N is a positive integer greater than or equal to 1.

[0012] Optionally, a torsion spring is provided between the shaft sleeve and the gear shaft for pushing the shaft sleeve to rotate and move the movable handle away from the fixed handle.

[0013] Optionally, the shift member is in an inverted triangle shape, and two bottom corners of the shift member are cut to form thrust portions against which the firing switch and the retracting switch can abut respectively.

[0014] Optionally, the inclination angles of the firing switch and the retracting switch relative to the rack are adjustable.

[0015] Compared with the above background technology, the automatic stapler provided by the present invention rotates by rotating the fixed driving wheel of the handle, and the firing gear set and the knife retracting gear set arranged on both sides of the fixed driving wheel are driven by the fixed driving wheel to rotate. When the firing gear set is meshed with the rack, the rack moves linearly relative to the main housing, and the knife retracting switch arranged at the first end of the rack touches the shifting member, so that the shifting member rotates around the gear shaft, the firing gear set is disengaged from the rack, and the knife retracting gear set is meshed with the rack, and the fixed driving wheel drives the knife retracting gear set to drive the rack to move in the opposite direction, and the knife retracting switch arranged at the second end of the rack touches the shifting member, so that the shifting member rotates around the gear shaft, the knife retracting gear set is disengaged from the rack, and the firing gear set is meshed with the rack again.

[0016] By reasonably setting the transmission ratio of the rack and the fixed driving wheel, every time the handle is turned once, the rack just completes the switching between firing and retracting, without manually dragging the retracting. When the rack reciprocates, the firing switches and retracting switches at both ends touch the shifting member alternately, and the shifting member rotates around the gear shaft to change the switching between the firing gear set and the retracting gear set meshing with the rack, respectively, to achieve the switching between the feeding and retracting of the rack, and then drive the cutting knife of the stapler to complete the switching between the cutting and retracting states. It should be noted that the improvement of the present invention lies in the automatic switching between the feeding and retracting states of the rack, and the connection relationship between the parts such as the cutting and retracting driven by the linear motion of the rack can refer to the existing stapler settings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a driving portion of an automatic stapler provided in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the automatic stapler provided by an embodiment of the present invention switching from firing to retracting;

[0020] Figure 3 A schematic diagram of the automatic stapler provided by an embodiment of the present invention switching from retracting the knife to firing;

[0021] Figure 4 A schematic diagram of the connection between a movable handle and a fixed driving wheel provided in an embodiment of the present invention.

[0022] in:

[0023] 1-main housing, 2-rack, 3-shifter, 4-fixed driving wheel, 5-moving handle, 51-pin, 52-spring, 6-firing gear set, 7-retracting gear set, 8-firing switch, 9-retracting switch, 10-fixed handle. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the driving part of the automatic stapler provided in an embodiment of the present invention. Figure 2 A schematic diagram of the automatic stapler provided by an embodiment of the present invention switching from firing to retracting. Figure 3 A schematic diagram of the automatic stapler provided by an embodiment of the present invention switching from retracting to firing, Figure 4 A schematic diagram of the connection between a movable handle and a fixed driving wheel provided in an embodiment of the present invention.

[0027] The automatic stapler provided by the present invention comprises a main housing 1, a cutting knife for cutting tissue arranged at the front end of the main housing 1 and a driving part for driving the cutting knife to perform firing, cutting and retracting. The core part of the present invention is to improve the driving part. The driving part comprises a rack 2, a fixed driving wheel 4, a firing gear set 6, a retracting gear set 7, a shifting member 3 and a movable handle 5. The rack 2 feeds and retracts relative to the main housing 1, and drives the cutting knife to perform cutting and retracting through a connecting rod and other mechanisms.

[0028] In the specific embodiment provided by the present invention, the shift member 3 is connected to the main housing 1 by rotating the gear shaft, the fixed driving wheel 4 is connected to the shift member 3 by the gear shaft, the movable handle 5 is connected to the fixed driving wheel 4, and the fixed driving wheel 4 is driven to rotate by the rotation of the movable handle 5. The firing gear group 6 and the retracting gear group 7 are also arranged on the shift member 3 and are respectively located on both sides of the fixed driving wheel 4. The rotation of the shift member 3 makes the firing gear group 6 and the retracting gear group 7 respectively engage with the rack 2, thereby realizing the switching of feeding and retracting of the rack 2.

[0029] Will Figure 2 and Figure 3 The right side is defined as the first end, and the left side is defined as the second end. In order to promote the rotation of the shift member 3, the present invention adopts a method of setting a retract switch 9 at the first end of the rack 2 and a firing switch 8 at the second end of the rack 2. When the firing gear set 6 is meshed with the rack 2 and the rack 2 moves toward the second end to drive the cutting knife to cut, the retract switch 9 will touch the shift member 3, the shift member 3 rotates around the gear shaft, the firing gear set 6 is disengaged from the rack 2, the retract gear set 7 is meshed with the rack 2, the fixed driving wheel 4 drives the retract gear set 7 to drive the rack 2 to move toward the first end, and the rack 2 drives the cutting knife to slowly open and retract, thereby avoiding the involvement of human tissue. When the firing switch 8 at the second end touches the second end of the shift member 3, the shift member 3 rotates to disengage the retracting gear group 7 from the rack 2, and the firing gear group 6 engages with the rack 2. The fixed driving wheel 4 rotates through the shift member 3 to realize that the firing gear group 6 and the retracting gear group 7 alternately engage with the rack 2, thereby pushing the cutting knife to switch alternately between cutting and retracting.

[0030] In the above embodiment, the fixed driving wheel 4 can be specifically a flywheel, so that when the movable handle 5 is rotated, the fixed driving wheel 4 can be driven to rotate in one direction. When the movable handle 5 completes a push reset process, the fixed driving wheel 4 does not drive the firing gear set 6 and the retracting gear set 7 to rotate. When the fixed driving wheel 4 is a flywheel, the fixed driving wheel 4 and the movable handle 5 are respectively arranged on both sides of the shift member 3, and the movable handle 5 is fixedly connected to the inner ring of the flywheel of the fixed driving wheel 4 through the shaft sleeve that penetrates the shift member 3. The two ends of the gear shaft are fixed on the main housing 1. The movable handle 5 and the fixed driving wheel 4 are both rotated around the gear shaft through the shaft sleeve, and the shift member 3 rotates around the shaft sleeve. When the movable handle 5 is turned to drive the outer ring of the flywheel to rotate through the inner ring of the flywheel, the firing gear set 6 and the retracting gear set 7 rotate with the fixed driving wheel 4. When the movable handle 5 is reversely reset, the inner ring of the flywheel rotates, and the outer ring of the flywheel does not rotate. The fixed driving wheel 4 will not drive the firing gear set 6 and the retracting gear set 7 to rotate, so that the movable handle 5 can be turned again after being reset.

[0031] The unidirectional toggle driving of the movable handle 5 to drive the fixed driving wheel 4 to rotate and the reverse resetting process to keep the fixed driving wheel 4 stationary can be achieved not only by using a flywheel on the fixed driving wheel 4, but also by connecting the movable handle 5 to the fixed driving wheel 4 through a unidirectional driven ratchet structure, which will not be elaborated in this application.

[0032] In order to optimize the above embodiment, another embodiment provided by the present invention is further provided with an elastic member for driving the movable handle 5 to reset. The elastic member is specifically a torsion spring, which is arranged between the shaft sleeve and the gear shaft. The gear shaft and the shaft sleeve are both provided with through holes penetrating in the radial direction. One torsion arm of the torsion spring is inserted into the through hole of the gear shaft, and the other torsion arm of the torsion spring is inserted into the through hole of the shaft sleeve. When the movable handle 5 is toggled to drive the fixed driving wheel 4 to rotate, the torsion spring is compressed. When the fixed driving wheel 4 is released, the elastic force generated by the torsion spring pushes the movable handle 5 to reset.

[0033] The number of gears of the firing gear set 6 can be set to 2N, and the number of gears of the retracting gear set 7 can be set to 2N-1, where N is a positive integer greater than or equal to 1. In other words, the rotation direction of the gear at the end of the firing gear set 6 that is used to mesh with the rack 2 is consistent with the rotation direction of the fixed driving wheel 4, and the rotation direction of the gear at the end of the retracting gear set 7 that is used to mesh with the rack 2 is opposite to the rotation direction of the fixed driving wheel 4. The feeding and retracting of the rack 2 are achieved through the differentiated settings of the firing gear set 6 and the retracting gear set 7.

[0034] exist Figure 2 and Figure 3In the embodiment shown, the firing gear set 6 has two gears, the retracting gear set 7 has one gear, the main housing 1 is provided with a fixed handle 10, the fixed driving wheel 4 and the movable handle 5 are provided so that the movable handle 5 can only drive the fixed driving wheel 4 to rotate counterclockwise, and when the movable handle 5 is reset away from the fixed handle 10, the fixed driving wheel 4 remains stationary. Since the gear at the end of the firing gear set 6 rotates in the same direction as the fixed driving wheel 4, when the firing gear set 6 is meshed with the rack 2, the gear at the end of the firing gear set 6 rotates counterclockwise to drive the rack 2 toward the second end, i.e. Figure 2 As shown in the left side movement, the retract switch 9 touches the first end of the shift member 3, the firing gear set 6 disengages from the rack 2, the retract gear set 7 engages with the rack 2, and the movable handle 5 is reset under the action of the torsion spring. The movable handle 5 is turned again, and the retract gear set 7 drives the rack 2 to move until the firing switch 8 touches the second end of the shift member 3, thereby realizing the switching of the firing and retracting states of the automatic stapler, that is, the feeding and retracting states of the rack 2.

[0035] The shift member 3 is a plate-like member that is generally in the shape of an inverted triangle. The two bottom corners of the shift member 3 are cut off to form thrust portions at the two bottom corners for the firing switch 8 and the retracting switch 9 to respectively abut against. The firing switch 8 and the retracting switch 9 are arranged to be inclined relative to the rack 2 toward the thrust portions of the shift member 3. The firing switch 8 and the retracting switch 9 can be connected to the rack 2 by screws. After the inclination angles of the firing switch 8 and the retracting switch 9 relative to the rack 2 are adjusted into place, the screws are tightened.

[0036] As the firing switch 8 and the knife retracting switch 9 follow the feeding and retracting of the rack 2, the shifting member 3 is pushed to rotate, the movement state of the rack 2 is switched, and the automatic stapler cutting knife is completed to cut and retract. The automatic stapler provided by the present invention realizes the automatic switching of cutting and retracting by means of the differential setting of the firing gear set 6 and the knife retracting gear set 7, and the rotation of the shifting member 3 is respectively engaged with the rack 2 to realize the automatic switching of cutting and retracting. The firing switch 8 and the knife retracting switch 9 follow the movement of the rack 2 to push the shifting member 3 to rotate and shift. During operation, the fixed handle 10 is held in one hand, and the movable handle 5 is moved toward the fixed handle 10, which is convenient for one-handed operation and simplifies the knife retracting operation of the automatic stapler.

[0037] In addition, the connection between the movable handle 5 and the fixed driving wheel 4 can also refer to Figure 4 The movable handle 5 is integrally fixed to the gear shaft, and a pin 51 with a spring 52 is provided on the gear shaft. A wedge-shaped tooth is designed inside the fixed driving wheel 4. When the movable handle 5 is held and rotated counterclockwise, the pin 51 clamps the straight surface of the wedge-shaped tooth, driving the fixed driving wheel 4 to rotate counterclockwise. When the movable handle 5 is released, the spring bends 52 to make the pin 51 slide along the inclined surface of the wedge-shaped tooth, and at this time, the fixed driving wheel 4 cannot be driven to rotate.

[0038] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0039] The automatic stapler provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An automatic stapler, characterized in that: include: A main housing (1), a rack (2), a shifting member (3), a fixed driving wheel (4), a movable handle (5), a firing gear set (6) meshing with the fixed driving wheel (4) to drive the rack (2) to advance, and a retracting gear set (7) meshing with the fixed driving wheel (4) to drive the rack (2) to retract, wherein the rack (2) advances and retracts relative to the main housing (1); The fixed driving wheel (4) and the shifting member (3) are rotatably connected to the main housing (1) via a gear shaft; the movable handle (5) is used to drive the fixed driving wheel (4) to rotate; the firing gear set (6) and the knife retracting gear set (7) are fixed to the shifting member (3) and are respectively located on both sides of the fixed driving wheel (4); The first end of the rack (2) is provided with a retract switch (9) for driving the shift member (3) to rotate until only the retract gear group (7) is meshed with the rack (2), and the second end of the rack (2) is provided with a firing switch (8) for driving the shift member (3) to rotate until only the firing gear group (6) is meshed with the rack (2).

2. The automatic stapler according to claim 1, characterized in that: The main housing (1) comprises a fixed handle (10); when the movable handle (5) rotates towards the fixed handle (10), the fixed driving wheel (4) rotates counterclockwise; when the movable handle (5) is moved away from the fixed handle (10) to reset, the fixed driving wheel (4) remains stationary.

3. The automatic stapler according to claim 2, characterized in that: The fixed driving wheel (4) is a flywheel, and the movable handle (5) is fixedly connected to the inner ring of the flywheel via a shaft sleeve.

4. The automatic stapler according to claim 3, characterized in that: The number of gears of the firing gear set (6) is 2N, and the number of gears of the knife retracting gear set (7) is 2N-1, where N is a positive integer greater than or equal to 1.

5. The automatic stapler according to claim 3, characterized in that: A torsion spring is provided between the shaft sleeve and the gear shaft for pushing the shaft sleeve to rotate and move the movable handle (5) away from the fixed handle (10).

6. The automatic stapler according to claim 4 or 5, characterized in that: The shifting member (3) is in the shape of an inverted triangle, and two bottom corners of the shifting member (3) are cut to form thrust portions for the firing switch (8) and the knife retracting switch (9) to abut against respectively.

7. The automatic stapler according to claim 6, characterized in that: The inclination angles of the firing switch (8) and the knife retraction switch (9) relative to the rack (2) are adjustable.

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