Safety device for surgical instruments and laparoscopic stapler

Abstract

The present invention provides a safety device for a surgical instrument and a laparoscopic stapler including such a safety device, wherein the surgical instrument comprises: a handle housing; a firing rack slidably mounted to the handle housing; a firing component partially disposed in the handle housing; a firing tooth movably connected to the firing component and a safety device. The firing tooth is detachably engaged with the firing rack, and the actuation of the firing component drives the firing tooth to move, and further pushes the firing rack to move distally. The safety device comprises a safety block and a safety firing component, wherein the safety block has a first position and a second position; when the safety block is in the first position, the safety block restricts the firing tooth from engaging with the rack; when the safety block is in the second position, the safety block allows the firing tooth to engage with the rack; the actuation of the safety firing component moves the safety block from the first position to the second position.

Description

Technical Field

[0001] The invention relates to surgical instruments, in particular to a safety device and a laparoscope stapler used for surgical instruments. Background Art

[0002] Some existing surgical instruments, such as cutting staplers, have a firing safety mechanism. The operator must first turn on the safety device before further using the instrument, thereby avoiding the accidental firing of the cutting and suturing assembly. The safety device of the cutting stapler currently on the market has a complex structure, and its function is achieved by the cooperation of multiple parts. It has the disadvantages of poor assembly processability, unstable performance, and a high risk of failure. If the safety fails, on the one hand, it may cause the operator to activate the firing function before confirming the cutting and anastomosis, resulting in unnecessary cutting and anastomosis; on the other hand, it may cause the stapler firing device to fail to start, affecting the smooth progress of the operation. Summary of the invention

[0003] On one hand, the present disclosure provides a safety device for surgical instruments to improve the problem of high failure risk in the prior art.

[0004] According to a first aspect of the present disclosure, a safety device for a surgical instrument is provided, the surgical instrument comprising: a handle housing, a firing rack slidably mounted to the handle housing, a firing component partially disposed in the handle housing, a firing tooth movably connected to the firing component, and a safety device. The firing tooth is detachably engaged with the firing rack, and the movement of the firing component causes the firing tooth to move, and further pushes the firing rack to move distally. The safety device comprises a safety block and a safety firing component. The safety block has a first position and a second position. When the safety block is in the first position, the safety block restricts the firing tooth from engaging with the rack; when the safety block is in the second position, the safety block does not restrict the firing tooth from engaging with the rack; the movement of the safety firing component causes the safety block to move from the first position to the second position.

[0005] In some embodiments according to the present disclosure, the firing rack includes a first tooth group and a second tooth group, and the firing tooth is detachably engaged with the second tooth group. The firing rack has a first engageable state and a second engageable state. When the firing rack is in the first engageable state, the movement of the firing component causes the firing tooth to engage with the first tooth group, so that the firing rack is converted from the first engageable state to the second engageable state.

[0006] In some embodiments of the present disclosure, the safety block has a safety boss. When the safety block is in a first position, the safety boss restricts the firing tooth from entering into a meshing state with the second tooth group; when the safety block is in a second position, the safety boss does not restrict the firing tooth from entering into a meshing state with the second tooth group.

[0007] In some embodiments according to the present disclosure, the safety device further comprises a firing rack reset structure, which acts on the firing rack to return the firing rack to the first meshable state. The firing rack further comprises a boss, and in the process of returning the firing rack to the first meshable state, the boss acts on the safety block to move the safety block from the second position to the first position.

[0008] In some embodiments according to the present disclosure, the safety block is mounted on the handle housing, and the safety firing component is mounted on the firing component or the handle housing. The movement of the firing component causes the movement of the safety firing component, or the movement of the firing component is independent of the movement of the safety firing component.

[0009] In some embodiments according to the present disclosure, the safety firing component and the firing component are each implemented as any one of a button, a dial, a trigger, and a rocker.

[0010] In some embodiments according to the present disclosure, the safety block rotationally moves around a fixed axis fixed to the handle housing.

[0011] In some embodiments according to the present disclosure, the safety block moves along a fixed track or along a straight line.

[0012] In some embodiments according to the present disclosure, a first engagement recess and a second engagement recess are provided in the handle housing, and a convex bulge is formed between the first engagement recess and the second engagement recess. When the safety block is in the first position, the engagement card package of the safety block engages with the first engagement recess; when the safety block is in the second position, the engagement card package engages with the second engagement recess. The actuation of the safety firing component drives the engagement card package to move from engaging with the first engagement recess to engaging with the second engagement recess. During the switching process of the safety block between the first position and the second position, the engagement card package passes over the convex bulge.

[0013] In some embodiments according to the present disclosure, the safety block further includes a stop block feature, wherein the stop block feature limits the movement of the firing rack during the switching of the safety block between the first position and the second position.

[0014] In some embodiments according to the present disclosure, the convex bulge of the handle housing is implemented as an elastic structure, so that when the engaging card package passes over the convex bulge, the convex bulge is elastically deformed.

[0015] In some embodiments according to the present disclosure, the handle shell is formed as a thinned portion or an internal hollow structure or a spring structure at the convex part.

[0016] According to another aspect of the present disclosure, a laparoscopic stapler is provided, which includes any one of the above-mentioned safety devices.

[0017] According to the safety device disclosed in the present invention, a safety block is provided to realize the safety function of the stapler firing system. The change of the state of the safety block can simply and effectively control the engagement of the firing tooth and the rack, and the risk of failure of the safety device is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 shows a schematic diagram of a surgical instrument according to the present disclosure;

[0019] Figure 2 shows a cross-sectional view of a safety device for a surgical instrument according to the present disclosure;

[0020] Figure 3 An exploded view of a safety device for a surgical instrument according to the present disclosure is shown;

[0021] Figure 4 shows a partial detailed view of a safety device for a surgical instrument according to the present disclosure;

[0022] Figure 5 A cross-sectional view of a safety device for a surgical instrument according to the present disclosure is shown, wherein the firing component is in an extreme actuation position;

[0023] Figures 6A-6C An enlarged view of the safety block is shown, wherein the safety block is in a first position; Figure 6B A safety block including a stop feature is shown, where the safety block stop feature limits the movement of the firing rack; Figure 6C A side view of a firing rack and a safety block including a stop feature is shown;

[0024] Fig. 7A Another enlarged view of the safety block is shown, wherein the safety block is in a first position;

[0025] Figure 7B Shows Fig. 7A A side view of the safety block shown;

[0026] Figures 8A-8C 8B shows an enlarged rear view of the safety block, wherein the safety trigger is in the extreme actuation position and the safety block is in the second position; wherein 8B shows the safety block including the stop feature, at which time the safety block stop feature releases the movement restriction of the firing rack; Figure 8C A side view of a firing rack and a safety block including a stop feature is shown;

[0027] Fig. 9 showing an enlarged view of the safety block, wherein the safety trigger is in an unactuated position and the safety block is in a second position;

[0028] Fig.10shows a cross-sectional view of a safety device for a surgical instrument according to the present disclosure, wherein the firing rack is in a distal-most position;

[0029] Fig.11 A firing rack reset structure is shown, wherein the firing shift tooth is engaged with the firing rack;

[0030] Fig.12 The firing rack reset structure is shown, wherein the reset piece abuts against the firing tooth;

[0031] Fig.13 A firing rack reset structure is shown, wherein the firing rack contacts the safety block;

[0032] Fig.14A A side view of the firing rack and the safety block is shown, wherein the firing rack is in contact with the safety block;

[0033] Fig. 14B A side view of the firing rack and the safety block is shown, wherein the firing rack is out of contact with the safety block;

[0034] Fig.15 A firing rack reset structure is shown, wherein the firing rack is in contact with the safety block.

[0035] Fig.16 The safety block is shown in a first position;

[0036] Fig.17 The safety block is shown in the second position.

[0037] List of reference numerals: 1. handle housing; 1-1. firing component rotation axis; 1-2. safety rotation axis; 1-3. track; 1-4. convex bump; 1-5. first engaging recess; 1-6. second engaging recess; 1-7. firing tooth stopper; 2. firing rack; 2-1. first tooth group; 2-2. second tooth group; 2-3. cam portion; 2-4. slot; 3. reset plate; 4. reset cap; 5. firing tooth; 5-1. end of the firing tooth; 6. firing 1. Tooth-shifting torsion spring; 2. Firing component torsion spring; 3. Firing trigger; 4. Safety trigger torsion spring; 5. Safety trigger; 6. Safety block; 7. Engaging card package; 8. Safety block; 9. Safety block; 10. Safety trigger boss; 11. Elasticity feature; 11. Safety block stop feature; 13. Reset tension spring; 14. Reset pin; 15. Locking block; 16. Locking block torsion spring; 17. Reset pin; 18. Safety trigger pin; 19. Firing tooth-shifting pin. DETAILED DESCRIPTION

[0038] The following, in conjunction with the accompanying drawings, will describe in detail the specific embodiments of the present application, which will make the technical solutions and other beneficial effects of the present application apparent. The same reference numerals are used in all the drawings to represent the same or similar components. It should be noted that the drawings are in a very simplified form and use inaccurate ratios, which are only used to facilitate and clearly assist in explaining the embodiments of the present application.

[0039] A first aspect of the present disclosure provides a safety device for a surgical instrument. As an example of a surgical instrument, Figure 1 A schematic diagram of a laparoscopic stapler is shown.

[0040] like Figure 2 As shown, the surgical instrument can mainly include a handle housing 1; a firing rack 2 slidably mounted to the handle housing 1, and the firing rack 2 can include a first tooth group 2-1 and a second tooth group 2-2; a firing component 8 partially disposed in the handle housing 1; a firing tooth 5 movably connected to the firing component 8, and a safety device. The firing tooth 5 is detachably engaged with the firing rack 2, especially the second tooth group 2-2 of the firing rack 2, and the actuation of the firing component 8 drives the firing tooth 5 to move, and further pushes the firing rack 2 to move toward the distal end.

[0041] The safety device may include: a safety block 11 mounted to the handle housing 1, and a safety firing component 10. The safety block 11 has a first position and a second position. When the safety block 11 is in the first position, the safety block 11 limits the engagement of the firing tooth 5 with the rack 2; when the safety block 11 is in the second position, the safety block 11 does not limit the engagement of the firing tooth 5 with the rack 2. The movement of the safety firing component 10 causes the safety block 11 to move from the first position to the second position.

[0042] The handle housing 1 may have a handle portion held by an operator (such as a physician, etc.), and may be composed of two halves. An internal volume may be formed between the two halves to accommodate other components of the surgical instrument, such as safety devices and the like. The firing component 8 may be mounted on the firing component rotation axis 1-1 within the handle housing 1, and its handle extends to the outside of the handle housing 1 to be actuated by the operator. The firing tooth 5 may be mounted on the firing component 8 by a firing tooth pin 19, and the actuation of the firing component 8 may drive the firing tooth 5 to move toward the distal end and enter a position that can engage with the firing rack 2.

[0043] The firing component rotation axis 1 - 1 can be formed integrally with the handle housing 1 by molding techniques such as injection molding, compression molding, 3D printing, and casting.

[0044] Alternatively, the firing component 8 can be implemented in the form of a button, a dial, a trigger, a rocker, etc., and in the specific embodiment shown in the drawings, the firing component 8 is implemented as a firing trigger 8, which is rotatable around the firing component rotation axis 1-1.

[0045] The actuation of the safety firing component 10 drives the safety block 11 to move from the first position to the second position. The safety firing component 10 can be mounted on the firing component 8 or the handle housing 1 through the safety firing component pin 18, and is configured so that the actuation of the firing component 8 allows the actuation of the safety firing component 10. In other words, the safety firing component 10 can be configured to be actuated by the operator only when the firing component 8 has been actuated. In particular, at this time, it can be further configured so that in the non-actuated state of the firing component 8, the operator's fingers cannot be buckled into the gap between the safety firing component 10 and the handle housing 1, thereby preventing misoperation.

[0046] In addition, the safety firing component 10 can also be configured to be actuated independently of the actuation of the firing component 8, that is, the movement of the firing component 8 and the movement of the safety firing component 10 can be independent of each other.

[0047] Alternatively, the safety firing component 10 can be implemented in the form of a button, a dial, a trigger, a rocker, etc. In the specific embodiment shown in the drawings, the safety firing component 10 is implemented as a safety trigger 10, and the actuation direction of the safety trigger 10 is along Fig. 6A The arrow direction around the reference numeral 10. The operator can actuate the firing component 8 and / or the safety firing component 10 by, for example, pressing, depressing, rotating, dialing, clicking, etc.

[0048] The safety block 11 can be rotatably moved around a fixed axis fixed to the handle housing 1. The fixed axis can be implemented as a safety rotation axis 1-2. Alternatively, the safety block 11 can also be configured to move along a fixed track or move along a straight line. In the specific embodiment shown in the drawings, the safety block 11 switches between the first position and the second position by its own rotation, but it should be understood that, in fact, the safety block 11 can work by rotating, sliding along a straight line, sliding along a specific track, etc.

[0049] In addition, the firing component 8 may be provided with a firing component elastic return device, which pushes the firing component 8 toward the unactuated position of the firing component 8. In the embodiment shown in the drawings, the firing component elastic return device may be implemented as a firing component torsion spring 7, which is mounted on the firing component rotation axis 1-1, and whose two ends abut against the firing component 8 and the handle housing 1, respectively. Figure 4 shown.

[0050] The firing tooth 5 may also be provided with a firing tooth elastic return device, which pushes the firing tooth 5 toward the firing rack 2. In the embodiment shown in the drawings, the firing tooth elastic return device may be implemented as a firing tooth torsion spring 6, which is mounted on the firing tooth pin 19, and the two ends of which abut against the firing component 8 and the firing tooth 5, respectively. Figure 3 As shown, the firing tooth 5 is tilted toward the firing rack 2 under the thrust of the firing tooth torsion spring 6, so that the end of the firing tooth 5 is meshed with the teeth of the firing rack 2.

[0051] The safety trigger component 10 may also be provided with a safety elastic return device, which pushes the safety trigger component 10 toward the unactivated position of the safety trigger component 10. In the embodiment shown in the drawings, the safety elastic return device may be implemented as a safety trigger component torsion spring 9, which is mounted on the safety trigger component pin 18, and the two ends of which abut against the trigger component 8 and the safety trigger component 10, respectively. Figure 4 shown.

[0052] In addition, if Fig.10 As shown, a firing tooth stopper 1-7 may also be provided in the handle housing 1. When the firing component 8 is in the non-actuated position, the thrust of the firing component elastic restoring device overcomes the thrust of the firing tooth elastic restoring device to push the proximal end surface of the firing tooth 5 against the firing tooth stopper 1-7, so that the firing tooth 5 rotates away from the firing rack 2 and disengages from the firing rack 2. The firing tooth stopper 1-7 may be implemented as a rib or web structure in the handle housing 1, for example, may be implemented as a reinforcing rib of the handle housing 1.

[0053] Back to Figure 3 The firing rack 2 can be mounted on the track 1-3 of the handle housing 1 and is restricted by the track 1-3 to move along the track 1-3 in the axial direction of the laparoscopic stapler toward the distal end or the proximal end. The firing rack 2 can also have a first tooth group 2-1. The firing rack 2 can have a first meshable state (for example, Figures 2 to 4 ) and a second engageable state (e.g., as Figure 5to 7). In the first engageable state, when the operator actuates the firing component 8, the firing tooth 5 can be driven to move toward the distal end to engage with the first tooth group 2-1 of the firing rack 2, and further movement of the firing tooth 5 toward the distal end can convert the firing rack 2 from the first engageable state to the second engageable state; in the second engageable state, when the safety is turned on (that is, the safety boss 11-2 of the safety block 11 is in the upper limit position), the operator actuates the firing component 8, which can drive the firing tooth 5 to move toward the distal end to engage with the second tooth group 2-2 of the firing rack 2. In the first engageable state, the firing rack 2 is located at the most proximal position. It should be understood that the state of the firing rack 2 is not limited to the first engageable state and the second engageable state described herein. The firing rack 2 may have other states (such as Fig.10 The return state shown in the figure), or an intermediate state between the first engageable state and the second engageable state, etc.

[0054] In particular, the distance between the first tooth group 2-1 and the second tooth group 2-2 of the firing rack 2 is greater than the tooth pitch of the second tooth group 2-2. The second tooth group 2-2 may include a plurality of teeth that are equidistant from each other and have the same shape. The size of the firing rack 2 may be designed so that in the initial state of the safety device (e.g. Figure 2 When the operator first actuates the firing member 8 to the limit actuation position, as shown in the initial state, Figure 5 As shown, the firing gear 5 pushes the firing rack 2 from the first engageable state to the second engageable state. It should be understood that the first tooth group 2-1 can be implemented to include a single tooth or a plurality of teeth without departing from the scope of the present invention.

[0055] When the safety block 11 is in the first position, the safety boss 11-2 of the safety block 11 is in the lower limit position (such as Fig. 6A , 7), when the safety block 11 is in the second position, the safety boss 11-2 of the safety block 11 is in the upper limit position (as shown in FIG. Fig. 9 As used herein, the "lower limit position" is located below the "upper limit position", and the safety boss 11-2 moves between the upper limit position and the lower limit position. In particular, as an exemplary manner, the safety boss 11-2 in the "lower limit position" exceeds the tooth top of the firing rack 2 downward, and the safety boss 11-2 in the "upper limit position" exceeds the tooth root of the firing rack 2 upward.

[0056] When the firing rack 2 is in the first meshable state, the safety boss 11-2 in the lower limit position allows the firing tooth 5 to mesh with the first tooth group 2-1 when the firing component 8 is actuated, thereby pushing the first tooth group 2-1 to move toward the distal end along the axial direction; and when the firing rack 2 is in the second meshable state, the safety boss 11-2 in the lower limit position is located within the tooth profile range of the second tooth group 2-2 (such as Fig. 6A , 7) and restricts the end 5-1 of the firing tooth 5 from moving into the tooth profile range when the firing component 8 is actuated again, thereby restricting the engagement of the firing tooth 5 with the second tooth group 2-2. When the safety boss 11-2 of the safety block 11 is at the upper limit position, the safety boss 11-2 of the safety block 11 is located outside the tooth profile range of the first tooth group 2-1 and the second tooth group 2-2, allowing the end 5-1 of the firing tooth 5 to move into the tooth profile range, thereby allowing the firing tooth 5 to engage with the second tooth group 2-2.

[0057] like Fig. 9 As shown, in some embodiments, a first engaging recess 1-5 and a second engaging recess 1-6 may be provided in the handle housing 1. A convex bulge 1-4 may be formed between the first engaging recess 1-5 and the second engaging recess 1-6.

[0058] When the safety block 11 is in the first position, the engagement card package 11-1 of the safety block 11 engages with the first engagement recess 1-5, so that the safety boss 11-2 is fixed in the lower limit position; when the safety block 11 is in the second position, the engagement card package 11-1 of the safety block 11 engages with the second engagement recess 1-6, so that the safety boss 11-2 is fixed in the upper limit position.

[0059] The activation of the safety firing component, especially the safety firing component 10, can drive the engagement card package 11-1 to move from the engagement with the first engagement recess 1-5 to the engagement with the second engagement recess 1-6, thereby moving the safety block 11 from the first position to the second position. During the switching of the safety block 11 between the first position and the second position, the engagement card package 11-1 passes over the convex bulge 1-4, that is, the engagement card package 11-1 abuts against the convex bulge 1-4 and moves relatively.

[0060] In particular, the convex 1-4 of the handle housing 1 can be implemented as an elastic structure, so that when the engagement card package 11-1 passes over the convex 1-4, the convex 1-4 undergoes elastic deformation. For this purpose, the handle housing 1 can be formed as a thinning portion or an internal hollow structure or a spring structure at the convex 1-4. For example, a recess can be provided at a position opposite to the convex 1-4 in the handle housing 1, so that the thickness of the handle housing 1 at the convex 1-4 is thinned or hollowed out, so that the convex 1-4 is relatively easier to deform. In addition, it should be understood that the convex 1-4 can also be formed into any other structure, as long as it can be made elastically deformable in the process of being passed over by the engagement card package 11-1. With the elastic deformation of the convex 1-4, the safety block 11 will have a tactile or sound feedback (such as a "click" sound) when passing over the convex 1-4 on the handle housing 1, indicating that the safety block 11 switches from the first position to the second position or from the second position to the first position.

[0061] Additionally or alternatively, the safety block 11 may be provided with an elastic feature 11-3, such as Fig.16 and 17 As shown. The elastic feature 11-3 can be implemented as a cut-out portion of the safety block 11 near the engagement card package 11-1, so that when the engagement card package 11-1 is engaged with the first engagement recess 1-5 or the second engagement recess 1-6, the elastic feature 11-3 is compressed and deformed due to the pressure between the safety block 11 and the engagement recesses 1-5, 1-6. In this way, when the safety block 11 passes over the convex bump 1-4 on the handle housing 1, there will be a tactile or sound feedback, indicating that the safety block 11 switches from the first position to the second position or from the second position to the first position.

[0062] In some embodiments, a safety block stop feature 11-4 may also be provided on the safety block 11, such as Figure 6B , 6C When the firing rack 2 is in the first meshable state and the safety block 11 is in the first position, the safety block stop feature 11-4 can limit the movement of the firing rack 2, as shown in FIG. Figure 6B and 6C When the safety block 11 is in the second position, the safety block stop feature 11-4 releases the movement restriction on the firing rack 2, as shown in FIG. Figure 8B and 8C shown.

[0063] exist Fig. 9 In the specific embodiment shown, the first engaging recess 1-5 is located below the second engaging recess 1-6. It should be understood that, depending on the specific structure of the safety block 11, the first engaging recess 1-5 may also be located above the second engaging recess 1-6.

[0064] In this specification, the distal end and the proximal end refer to the position of the surgical instrument, especially the laparoscopic stapler, relative to the operator during normal operation, wherein the distal end refers to the end farther from the operator and the proximal end refers to the end closer to the operator. Figure 2 In the perspective of FIG. 1 , the distal end points to the left side of the figure, and the proximal end points to the right side of the figure. The axial direction of the laparoscopic stapler refers to the direction from the proximal end of the laparoscopic stapler to the distal end.

[0065] In some embodiments, the safety device for surgical instruments according to the present disclosure may further include a firing rack reset structure, which acts on the firing rack 2 so that the firing rack 2 returns to the first meshable state. The firing rack reset structure may be connected to the firing rack 2 and may be capable of moving toward the proximal end (e.g., Fig.10 The firing rack 2 is pulled in the direction indicated by the middle arrow, preferably the firing rack 2 is pulled from the second engageable state back to the first engageable state.

[0066] Specifically, Figures 10 to 12 As shown, the firing rack reset structure may include a reset plate 3 and a reset spring 13 , and the reset plate 3 is connected to the firing rack 2 via the reset spring 13 .

[0067] The firing rack reset structure may further include a reset pin 17, which is connected to the firing rack 2 via a reset tension spring 13, a reset plate 3 is connected to the reset pin 17, and the reset plate 3 can move relative to the reset pin 17 toward the firing tooth 5. For example, an opening may be provided in the proximal end of the reset plate 3, the reset pin 17 is accommodated in the opening, and the shape of the opening is designed to allow the reset pin 17 to move up and down in the opening, but to limit movement in the axial direction. In fact, one end of the reset tension spring 13 is connected to the firing rack 2, and the other end may be connected to the reset plate 3 or the reset pin 17. Preferably, the reset tension spring 13 is connected to the reset plate 3 so that the force is evenly applied and wear is reduced.

[0068] The firing rack reset structure may further include a reset cap 4, such as Figure 3 The reset cap 4 is mounted to the reset pin 17 so that the operator can manually pull back the reset cap 4 and thereby pull the firing rack reset structure.

[0069] When the firing rack 2 is in the first meshable state, that is, the firing rack reset structure has not yet pulled the firing rack 2 toward the proximal end, the reset tension spring 13 is in a pre-tensioned state. The tensioned state of the reset tension spring 13 can apply a pulling force toward the distal end to the reset plate 3 during the process of the firing rack 2 moving toward the distal end (i.e., the firing process). The reset plate 3 is configured so that when it is pressed against the firing rack 2 toward the distal end, it will not move relative to the firing rack 2. The reset plate 3 can also be configured so that when the reset plate 3 moves toward the proximal end relative to the firing rack 2, for example, due to the engagement of the firing tooth 5 with the firing rack 2, the movement of the firing rack 2 toward the proximal end is blocked, and the reset plate 3 can move (for example, downward) to abut the firing tooth 5 and push the firing tooth 5 out of engagement with the firing rack 2.

[0070] In some embodiments, the firing rack 2 may be provided with axially extending slots 2-4 (eg Fig.14A and 14B As shown in the figure), the reset piece 3 in a sheet shape can be accommodated in the narrow groove 2-4. The narrow groove 2-4 is preferably arranged at the center of the firing rack 2. The firing rack 2 and the reset piece 3 can be respectively provided with two sets of inclined surfaces that cooperate with each other. The first set of inclined surfaces inclined toward the distal end can be in the shape of an arc, so that when the reset piece 3 is pressed against the firing rack 2 toward the distal end, due to the shape cooperation of the first set of inclined surfaces, it will not move downward relative to the firing rack 2 and hinder the engagement of the firing gear 5 with the firing rack 2. The second set of inclined surfaces inclined toward the proximal end makes it possible for the reset piece 3 to move downward due to the relative sliding between the second set of inclined surfaces when the reset piece 3 moves toward the proximal end relative to the firing rack 2. Alternatively, a reset piece pin 14 (such as Figures 10 to 12 As shown in the figure, the reset plate pin 14 cooperates with the second inclined surface provided in the firing rack 2, so that when the reset plate 3 moves toward the proximal end relative to the firing rack 2, the reset plate 3 moves downward.

[0071] In some embodiments, the firing rack 2 can also be configured so that when the firing rack reset structure pulls the firing rack 2 toward the proximal end, the firing rack 2 contacts the safety block 11 and changes the safety block 11 from the second position to the first position. For example, when the firing rack 2 moves to contact the safety block 11, a downward pressure (such as 10-2) is generated on the safety boss 11-2 on the safety block 11. Fig.14A As shown), the safety block 11 is transformed from the second position to the first position, as shown Figures 13 to 15 Specifically, the firing rack 2 may also have a cam portion 2-3, such as Fig.14A and 14B As shown in FIG. 16 , during the process of the firing rack 2 returning to the first position, the cam portion 2 - 3 acts on the safety block 11, so that the safety block 11 is converted from the second position to the first position. Fig.14AThe safety block 11, in particular the safety boss 11-2 of the safety block 11, is shown pressing the firing gear 2; Fig. 14B Correspondingly, it is shown that the safety block 11 moves to the second position, and the safety boss 11 - 2 is out of contact with the firing gear 5 , so that the firing gear 5 can engage with the firing rack 2 .

[0072] Another aspect of the present disclosure provides a laparoscopic stapler, which may include any one of the above-mentioned safety devices.

[0073] The operation process of the safety device for surgical instruments disclosed in the present invention is mainly divided into three stages: the safety effective stage, the safety opening stage, and the safety resetting stage. The safety device for surgical instruments according to the present invention is described below with reference to each operation process of the safety device.

[0074] Figure 2 The initial state of the safety device is shown, wherein the firing rack 2 is in a first engageable state, the safety block 11 is in a first position, and the safety boss 11 - 2 of the safety block 11 is in a lower limit position.

[0075] The following reference Figure 5 7 to 7 describe the insurance activation phase starting from the initial state of the insurance device.

[0076] The operator pulls the trigger member 8, the trigger member 8 twists the trigger member torsion spring 7 and drives the trigger tooth 5 to move toward the distal end, the trigger tooth 5 is engaged with the first tooth group 2-1 of the trigger rack 2, and drives the trigger rack 2 to move toward the distal end. Figure 5 As shown, the firing rack 2 moves from the first meshable state to the second meshable state. The operator then releases the firing member 8, and under the action of the firing member torsion spring 7, the firing member 8 returns to the unactivated or initial position, as shown in FIG. Fig. 6A As shown in FIG. 7 , at this time, the end of the firing tooth 5 abuts against the safety boss 11-2, and the safety boss 11-2 basically covers the tooth groove of the second tooth group 2-2. The safety block 11 is now in the first position, with an interference fit with the handle housing 1. As shown in FIG. 7 , the engagement card package 11-1 on the safety block 11 is engaged with the first engagement recess 1-5 and is in a compressed state (no relative movement without external force). At this time, the elastic feature 11-3 of the safety block 11 is in a compressed state as shown in FIG. Fig.16 The safety boss 11-2 on the safety block 11 presses the end 5-1 of the firing tooth 5 (as shown in FIG. Fig. 6A As shown), and basically covers the tooth groove of the second tooth group 2-2, the operator then pulls the trigger component 8 again, the trigger tooth 5 cannot enter the tooth groove of the second tooth group 2-2 of the firing rack 2, cannot mesh with the second tooth group 2-2, and cannot push the firing rack 2 to continue to move toward the distal end, and the insurance takes effect. Fig. 7A ,7B shown.

[0077] The following reference Figures 8A to 9 , describing the safety opening stage of the safety device.

[0078] The operator first pulls the trigger component 8 (not necessarily all the way), and the safety trigger component 10 moves to the actuable position. The operator then pulls the safety trigger component 10, twists the safety trigger component torsion spring 9, and the safety trigger component 10 pushes the safety block 11 from the first position to the second position. For example, the safety trigger component 10 may include a safety trigger component boss 10-1. When the operator pulls the safety trigger component 10, the safety trigger component boss 10-1 moves upward to the second position against the safety block 11. The safety trigger component 10 is actuated to the extreme position (pull to the bottom, such as Fig. 9 As shown in FIG. 1 , the safety boss 11-2 of the safety block 11 is at the upper limit position, and the engagement card package 11-1 is engaged with the second engagement recess 1-6. When the operator pulls the safety trigger component 10, the safety block 11 overcomes the convex bump 1-4 on the handle housing 1. At this time, there will be a tactile or sound feedback, and the safety is opened. At the same time, the safety block 11 and the handle housing 1 are in a compressed state to prevent the safety block 11 from falling downwards. Fig. 9 As shown (no relative movement without external force), the compression state of the elastic characteristic 11-3 of the safety block 11 is as follows Fig.17 Then, the operator releases the safety firing component 10, and under the action of the safety firing component torsion spring 9, the safety firing component 10 returns to the non-actuated position. At this time, if the operator pulls the trigger component 8 again, since the safety boss 11-2 is at the upper limit position and is outside the tooth profile range of the first tooth group 2-1 and the second tooth group 2-2, the firing tooth 5 can be engaged with the tooth groove of the second tooth group 2-2 on the firing rack 2, thereby realizing the firing function, as shown in FIG. Fig. 9 shown.

[0079] The following reference Figures 10 to 15 , describing the fuse reset phase of the fuse.

[0080] The operator manually pulls back the reset cap 4, which drives the reset plate 3 to move backward through the connection of the reset pin 17. The reset plate 3 is connected to the firing rack 2 through the reset tension spring 13. During the backward pulling process, the reset tension spring 13 is in a stretched state. In the case of normal reset, when the firing component 8 does not need to be triggered, the proximal surface of the firing tooth 5 abuts against the firing tooth block 1-7 of the handle housing 1, and the firing tooth 5 is separated from the firing rack 2 and disengaged, and can perform the return movement normally. During the return process, if the firing component 8 is accidentally triggered, referring to the working principle of the safety device described above, the firing tooth 5 is engaged with the teeth of the second tooth group 2-2 of the firing rack 2, and the firing rack 2 cannot be pulled back toward the proximal end. Fig.11 At this time, the operator continues to pull back the reset cap 4, and the reset plate 3 moves downward to abut against the firing gear 5 through the cooperation of the reset plate pin 14 and the inclined surface of the firing rack 2, and pushes the firing gear 5 downward to disengage the firing gear 5 from the firing rack 2, and then the firing rack 2 can be pulled back continuously, as shown in FIG. Fig.12 During the pull-back process, when the firing rack 2 moves to contact the safety block 11, a downward pressure is generated on the safety boss 11-2 on the safety block 11, as shown in FIG. Fig.13 and 14A As shown. The firing rack 2 continues to be pulled back, thereby driving the safety block 11 to rotate downward, and at the same time the safety block 11 overcomes the convex bumps 1-4 on the handle housing 1. At this time, there will be a tactile or sound feedback, and the safety block 11 rotates to the first position. Continue to pull back, and the safety device returns to the Figure 2 The initial state shown, thus a complete working cycle of the entire safety device is completed.

[0081] It should be understood that the described embodiments are only some specific implementations of the present application, rather than an exhaustive enumeration of all possible embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0082] In the above description, for the purpose of explanation, many specific details are set forth to provide a thorough understanding of various embodiments of the present application. However, it is apparent to those skilled in the art that embodiments of the present invention may be implemented without some of these specific details.

[0083] The foregoing description provides only exemplary embodiments and is not intended to limit the scope, applicability or configuration of the present disclosure. On the contrary, the foregoing description of the exemplary embodiments will provide a description for implementing the exemplary embodiments for those skilled in the art. It should be understood that various modifications, equivalent substitutions or improvements, etc. may be made to the functions and arrangements of the elements without departing from the spirit and scope of the present invention as set forth in the appended claims, and all should be included within the scope of protection of the present invention.

Claims

1. A safety device for a surgical instrument, the surgical instrument comprising: Handle housing (1); a firing rack (2) slidably mounted to the handle housing (1); a firing component (8) partially disposed in the handle housing (1); a firing tooth (5) movably connected to the firing member (8), wherein the firing tooth (5) is detachably engaged with the firing rack (2), and the movement of the firing member (8) causes the firing tooth (5) to move and pushes the firing rack (2) to move toward the distal end; And a safety device, characterized in that the safety device comprises: A safety block (11), and Safety trigger component (10); Wherein, the safety block (11) has a first position and a second position; When the safety block (11) is in the first position, the safety block (11) limits the engagement of the firing tooth (5) with the firing rack (2); When the safety block (11) is in the second position, the safety block (11) does not restrict the firing tooth (5) from meshing with the firing rack (2); The movement of the safety triggering component (10) causes the safety block (11) to move from the first position to the second position; and A first engaging recess (1-5) and a second engaging recess (1-6) are provided in the handle housing (1), and a convex bump (1-4) is formed between the first engaging recess (1-5) and the second engaging recess (1-6); Wherein, when the safety block (11) is in the first position, the engaging card package (11-1) of the safety block (11) engages with the first engaging recess (1-5); When the safety block (11) is in the second position, the engagement card package (11-1) engages with the second engagement recess (1-6); and The actuation of the safety firing component (10) drives the engagement card package (11-1) to move from engagement with the first engagement recess (1-5) to engagement with the second engagement recess (1-6); During the process of the safety block (11) switching between the first position and the second position, the engaging card package (11-1) passes over the convex package (1-4).

2. The safety device according to claim 1, characterized in that: The firing rack (2) comprises a first tooth group (2-1) and a second tooth group (2-2), and the firing tooth (5) is detachably meshed with the second tooth group (2-2); The firing rack (2) has a first engageable state and a second engageable state; When the firing rack (2) is in the first engageable state, the movement of the firing component (8) causes the firing tooth (5) to engage with the first tooth group (2-1), so that the firing rack (2) is converted from the first engageable state to the second engageable state.

3. The safety device according to claim 2, characterized in that: The safety block (11) has a safety boss (11-2); Wherein, when the safety block (11) is in the first position, the safety boss (11-2) restricts the firing tooth (5) and the second tooth group (2-2) from entering a meshing state; When the safety block (11) is in the second position, the safety boss (11-2) does not restrict the firing tooth (5) and the second tooth group (2-2) from entering a meshing state.

4. The safety device according to claim 3, characterized in that: It also includes a firing rack reset structure, which acts on the firing rack (2) to restore the firing rack (2) to the first meshable state; The firing rack (2) also has a cam portion (2-3). When the firing rack (2) returns to the first engageable state, the cam portion (2-3) acts on the safety block (11), so that the safety block (11) moves from the second position to the first position.

5. The safety device according to claim 1, characterized in that: The safety block is mounted on the handle housing (1), and the safety firing component (10) is mounted on the firing component (8) or the handle housing (1); The movement of the firing component (8) causes the movement of the safety firing component (10), or the movement of the firing component (8) and the movement of the safety firing component (10) are independent of each other.

6. The safety device according to claim 1, characterized in that: The safety firing component (10) is any one of a button, a dial, a trigger, and a rocker, and the firing component (8) is any one of a button, a dial, a trigger, and a rocker.

7. The safety device according to claim 1, characterized in that: The safety block (11) is rotatably movable around a fixed axis fixed to the handle housing (1).

8. The safety device according to claim 1, characterized in that: The safety block (11) moves along a fixed track or along a straight line.

9. The safety device according to claim 1, characterized in that: The safety block (11) further comprises a stop block feature (11-4), wherein the stop block feature (11-4) limits the movement of the firing rack (2) during the switching of the safety block (11) between the first position and the second position.

10. The safety device according to claim 1, characterized in that: The convex bulge (1-4) of the handle housing (1) is an elastic structure, so that when the engaging card package (11-1) passes over the convex bulge (1-4), the convex bulge (1-4) undergoes elastic deformation.

11. The safety device according to claim 10, characterized in that: The handle shell (1) is formed as a thinned portion or an internal hollow structure or a spring sheet structure at the convex bump (1-4).

12. A laparoscopic stapler comprising the safety device according to any one of claims 1 to 11.

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