CN111281461B - Driving device, structure for preventing transmission mechanism from being blocked, steering part and anastomat - Google Patents

Abstract

The invention discloses a steering member, a structure for preventing a transmission mechanism from being blocked and a cutting knife driving device for a anastomat, wherein the cutting knife driving device for the anastomat comprises the structure for preventing the transmission mechanism from being blocked; when the limiting piece is located at the first position, the transmission mechanism drives the cutting knife to move forwards, and when the limiting piece is located at the second position, the transmission mechanism drives the cutting knife to move backwards. The operator can control the limiting piece through manual control steering piece, and the limiting piece is used for controlling the motion mode of drive mechanism to the direction of motion of control cutting knife.

Description

Driving device, structure for preventing transmission mechanism from being blocked, steering part and anastomat

Technical Field

The invention relates to a cutter driving device for a anastomat, a structure for preventing a transmission mechanism from being blocked, a steering part and a corresponding anastomat.

Background

Endoluminal anastomat is well known to have found widespread use in reconstructive surgery of the stomach, colorectal, etc.

Existing endoluminal cutting staplers generally include a handle assembly, a shaft assembly extending longitudinally from the handle assembly, and an end effector disposed at a distal end of the shaft assembly. A firing bar is arranged in the bar body component. A cutting knife is arranged in the end effector. The firing bar is connected with the cutting knife. The handle assembly is internally provided with a transmission mechanism, and the transmission mechanism comprises a rack and a gear which are connected with each other. The rack is connected with the firing bar. The gear drives the rack to move backwards, and the rack drives the cutting knife to move backwards through the firing bar, namely the knife is retracted. However, during withdrawal, the gears and racks tend to become stuck, increasing the risk of surgery.

Disclosure of Invention

The invention aims to provide a structure for preventing a transmission mechanism from being blocked and an anastomat thereof.

In order to achieve the above purpose, the present invention is realized by the following technical scheme: the structure for preventing the transmission mechanism from being blocked comprises a first toothed member, a second toothed member and a pushing member, wherein the first toothed member is meshed with the second toothed member, the structure comprises a steering member and a limiting member, the steering member comprises a groove, the limiting member comprises a convex part, and the convex part is at least partially positioned in the groove; the limiting piece is provided with a first position and a second position, when the limiting piece is positioned at the first position, the pushing piece drives the second toothed piece to move along the second direction, and when the limiting piece is positioned at the second position, the first toothed piece drives the second toothed piece to move along the first direction, wherein the second direction is opposite to the first direction; the groove pushes against the convex part along a third direction, so that the limiting part moves from the first position to the second position, and the groove pushes against the convex part along a fourth direction opposite to the third direction, so that the limiting part moves from the second position to the first position.

Further, the steering member includes a first main body portion, and a first protrusion and a second protrusion protruding from the first main body portion, the recess is formed between the first protrusion and the second protrusion, and the limiting member includes a second main body portion and the protrusion extending from the second main body portion.

Further, the steering member further includes a pressing portion protruding from the first main body portion, and a protruding direction of the pressing portion is perpendicular to a protruding direction of the first bump and the second bump.

Further, when the pressing portion is pressed in the fourth direction, the second projection pushes against the convex portion to move the stopper from the second position to the first position; when the pressing portion is pressed in the third direction, the first bump pushes against the protruding portion to move the stopper from the first position to the second position.

Further, the transmission mechanism further comprises a movable handle, and the movable handle provides external force to enable the pushing piece to drive the second toothed piece to move along the second direction.

Further, the transmission mechanism further comprises a sector toothed cam, and the sector toothed cam provides an external force to enable the first toothed member to drive the second toothed member to move along the first direction.

Further, the sector toothed cam rotates synchronously with the movable handle.

Further, the transmission mechanism further comprises a first rod piece, the movable handle and the pushing piece are connected to the first rod piece, the movable handle drives the first rod piece to move along the second direction, the first rod piece drives the pushing piece to move along the second direction, and the pushing piece pushes the second toothed piece forwards along the second direction.

Further, the transmission mechanism further comprises a pull spring piece, the pull spring piece is connected to the pushing piece, and when the first rod piece drives the pushing piece to advance, the pull spring piece pulls the pushing piece backwards so that the pushing piece rotates to be abutted with the second toothed piece.

Further, the pushing member includes a third main body portion and a protruding portion protruding from the third main body portion, and the first rod member is provided with a stop portion, and when the stop member is located at the second position, the stop portion cooperates with the protruding portion to enable the pushing member to be unable to rotate around the first rod member.

Further, the transmission mechanism further comprises a third toothed member, a fourth toothed member and a second rod member, wherein the third toothed member and the fourth toothed member are both connected to the second rod member, the second rod member is provided with a linkage lug, the third toothed member is meshed with the first toothed member, and the fourth toothed member is meshed with the fan-shaped toothed cam.

Further, when the limiting piece is located at the first position, the linkage protruding block is only connected to the third toothed piece, and the third toothed piece and the fourth toothed piece rotate independently; when the limiting piece is located at the second position, the linkage protruding block is simultaneously connected to the third toothed piece and the fourth toothed piece, and the third toothed piece and the fourth toothed piece rotate in the same direction.

Further, the transmission mechanism further comprises a fifth toothed member, the fifth toothed member is meshed with the third toothed member, the third toothed member drives the fifth toothed member to rotate, the fifth toothed member is provided with a push block, and the push block is used for pushing the limiting member to enable the limiting member to move from the first position to the second position.

Further, the limiting piece comprises two vertical parts and a horizontal part, wherein the two vertical parts are oppositely arranged, the horizontal part is connected with the two vertical parts, and the pushing block is used for pushing the horizontal part.

Further, the toothed member is a gear or a rack; the movement includes both rotation and movement.

The invention also provides an anastomat, which comprises a handle assembly, a rod body assembly extending longitudinally from the handle assembly and an end effector arranged at the distal end of the rod body assembly, wherein the end effector comprises a cutting knife, a firing rod is arranged in the rod body assembly and is connected with the cutting knife, the handle assembly comprises a transmission mechanism and the structure for preventing the transmission mechanism from being blocked, and the firing rod is connected with the second toothed member.

The invention aims to provide a cutter driving device for a anastomat and the anastomat, which can relieve the clamping of a retracting cutter.

In order to achieve the above purpose, the present invention is also realized by the following technical scheme: the cutter driving device for the anastomat comprises a transmission mechanism and a steering assembly, wherein the steering assembly comprises a steering piece and a limiting piece, the limiting piece is provided with a first position and a second position, when the limiting piece is positioned at the first position, the transmission mechanism drives the cutter to move forwards, and when the limiting piece is positioned at the second position, the transmission mechanism drives the cutter to move backwards; the steering member comprises a first driving structure for driving the limiting member to move from the first position to the second position, and a second driving structure for driving the limiting member to move from the second position to the first position.

Further, the first driving structure is a first bump, the second driving structure is a second bump, a groove is formed between the first bump and the second bump, the limiting piece comprises a protruding portion, and the protruding portion is at least partially accommodated in the groove.

Further, the steering member further includes a first body portion, and the first projection and the second projection each protrude from the first body portion; the limiting piece comprises a second main body part and the convex part extending from the second main body part.

Further, the steering member further includes a pressing portion protruding from the first main body portion; when the pressing part is pressed downwards, the first lug pushes against the protruding part to enable the limiting piece to move from the first position to the second position, and when the pressing part is pressed upwards, the second lug pushes against the protruding part to enable the limiting piece to move from the second position to the first position.

Further, the transmission mechanism comprises a first rod piece, a pushing piece and a rack, wherein the rack is connected with the cutting knife, the pushing piece is connected with the first rod piece, and the pushing piece can rotate around the first rod piece to be abutted with the rack and push the rack forwards.

Further, the anastomat comprises a firing trigger, the firing trigger is connected to the first rod piece, when the limiting piece is positioned at the first position, the firing trigger fires, the firing trigger drives the first rod piece to move forwards, and the first rod piece drives the pushing piece to move forwards.

Further, the transmission mechanism further comprises a pull spring piece, the pull spring piece is connected to the pushing piece, and when the first rod piece drives the pushing piece to move forwards, the pull spring piece pulls the pushing piece backwards so that the pushing piece rotates to be abutted with the rack.

Further, the pushing member includes a third main body portion and a protruding portion protruding from the third main body portion, and the first rod member is provided with a stop portion.

Further, the transmission mechanism further comprises a plurality of gears, the gears comprise a first gear connected with the firing trigger, a third gear meshed with the rack and a second gear meshed with the third gear, and the firing trigger drives the rack through transmission among the gears.

Further, the transmission mechanism further comprises a second rod, the first gear and the second gear are both connected to the second rod, when the limiting piece is located at the first position, the first gear and the second gear rotate independently, and when the limiting piece is located at the second position, the first gear and the second gear rotate synchronously.

Further, the second rod member is provided with a linkage protruding block, when the linkage protruding block is only connected with the first gear or the second gear, the first gear and the second gear rotate independently, and when the linkage protruding block is simultaneously connected with the first gear and the second gear, the first gear and the second gear rotate synchronously.

Further, the gears further comprise a fourth gear meshed with the second gear, and the fourth gear is provided with a pushing block used for pushing the limiting piece.

Further, the limiting piece comprises two vertical parts and a horizontal part, wherein the two vertical parts are oppositely arranged, the horizontal part is connected with the two vertical parts, and the pushing block is used for pushing the horizontal part.

Further, the stapler comprises a firing bar, the cutting knife is connected with the distal end of the firing bar, and the transmission mechanism is connected with the proximal end of the firing bar.

The invention also provides an anastomat, which comprises a handle assembly, a rod body assembly extending longitudinally from the handle assembly and an end effector arranged at the distal end of the rod body assembly, wherein the end effector comprises a cutting knife, a firing bar is arranged in the rod body assembly and is connected with the cutting knife, the handle assembly comprises the cutter driving device for the anastomat, and the firing bar is connected with a transmission mechanism of the cutter driving device for the anastomat.

The invention aims to provide a steering piece which is suitable for a stapler for relieving the clamping of a retracting knife, has a simple structure and is easy and convenient to operate.

In order to achieve the above purpose, the present invention is realized by the following technical scheme: the steering part is used for being matched with a limiting part to drive the limiting part to move, and comprises a groove and a pressing part, wherein the groove is used for being matched with the limiting part.

Further, the steering member includes a first main body portion, and a first bump and a second bump protruding from the first main body portion, where the groove is formed between the first bump and the second bump.

Further, the recess is substantially U-shaped.

Further, the pressing portion protrudes from the first main body portion.

Further, the groove extends along a first direction, and the pressing part protrudes along a second direction, wherein the first direction is perpendicular to the second direction.

Further, the limiting piece comprises a second main body part and the convex part extending from the second main body part, and the convex part is at least partially positioned in the groove.

Further, the steering member enables the limiting member to be switched between a first position and a second position; when the pressing portion is pressed in a first direction, the first bump pushes against the protruding portion to move the stopper from the first position to the second position, and when the pressing portion is pressed in a second direction, the second bump pushes against the protruding portion to move the stopper from the second position to the first position, the second direction being opposite to the first direction.

The beneficial effects of the invention are as follows: the operator can control the limiting piece to move from the second position to the first position through manual control of the steering piece, and the limiting piece is used for controlling the movement mode of the transmission mechanism, so that the movement direction of the cutting knife is controlled to be steered and fed by the retracting knife, and the clamping condition of the gear and the rack in the retracting process can be relieved. The steering member provided by the invention has the advantages of simple structure and simplicity and convenience in operation.

Drawings

FIG. 1 is a schematic view of the stapler of the present invention;

FIG. 2 is an exploded perspective view of the stapler of FIG. 1;

FIG. 3 is a schematic view of a portion of the stapler of FIG. 2;

FIG. 4 is a schematic view of a portion of the stapler of FIG. 3;

FIG. 5 is a schematic view of the stapler of FIG. 4 at another angle;

FIG. 6 is a schematic view of the stapler of FIG. 5 at another angle;

FIG. 7 is an exploded perspective view of the stapler of FIG. 6;

FIG. 8 is an exploded perspective view of a portion of the stapler of FIG. 7;

FIG. 9 is a schematic view of a portion of the stapler of FIG. 6;

FIG. 10 is a schematic view of the stapler of FIG. 9 at another angle;

FIG. 11 is a schematic view of a portion of the stapler of FIG. 6;

FIG. 12 is a schematic view of a portion of the stapler of FIG. 11;

Fig. 13 is a schematic view of a portion of the stapler of fig. 9.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. The meaning of "several" is at least one.

The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

Prior art endoluminal incision staplers have generally included a handle assembly, a shaft assembly extending longitudinally from the handle assembly, and an end effector disposed at a distal end of the shaft assembly. A firing bar is arranged in the bar body component. A cutting knife is arranged in the end effector. The firing bar is connected with the cutting knife. The handle component is internally provided with a transmission mechanism which comprises a rack, a gear and a pushing piece. The rack is connected with the firing bar. The rack drives the cutting knife to move forwards or backwards through the firing bar. The pushing piece is used for pushing the rack forwards, so that the feeding is realized. The rack is meshed with the gear for transmission, and the gear drives the rack to move backwards, so that the tool retracting is realized. The handle assembly is further provided with a mechanism for preventing the transmission mechanism from being blocked, the mechanism comprises a steering assembly, the steering assembly comprises a limiting piece and a steering piece, when the limiting piece is located at a first position, the pushing piece drives the rack to move forwards, the rack drives the gear to rotate, the gear drives the limiting piece to gradually move from the first position to a second position in the process, however, the situation that the gear and the rack are blocked easily occurs at the moment, namely, the gear cannot drive the limiting piece to move from the first position to the second position. When the gear and the rack are clamped, the steering part is pressed downwards, the steering part drives the limiting part to move from the first position to the second position, and when the limiting part is positioned at the second position, the gear can drive the rack to move backwards through the firing trigger of the firing anastomat, so that the tool retracting is realized. However, in the process of retracting the cutter, when the gear and the rack are clamped, the steering member cannot drive the limiting member to move from the second position to the first position, i.e. the situation that the gear and the rack are clamped in the process of retracting the cutter cannot be solved.

The invention discloses a structure for preventing a transmission mechanism from being blocked, which comprises a first toothed member, a second toothed member and a pushing member, wherein the first toothed member and the second toothed member are in meshed transmission, the first toothed member drives the second toothed member to move along a first direction, and the pushing member drives the second toothed member to move along a second direction, wherein the second direction is opposite to the first direction. The mechanism for preventing the transmission mechanism from being blocked comprises a steering part and a limiting part, wherein the steering part comprises a groove, the limiting part comprises a convex part, and the convex part is at least partially positioned in the groove. The steering part is used for driving the limiting part to switch between a first position and a second position, when the limiting part is positioned at the first position, the pushing part drives the second toothed part to move along the second direction, and when the limiting part is positioned at the second position, the first toothed part drives the second toothed part to move along the first direction. The transmission mechanism also comprises a third toothed member, a fourth toothed member and a fifth toothed member. The third toothed member is engaged with the first toothed member, the fourth toothed member is engaged with the firing trigger, and the third toothed member and the fourth toothed member are rotatable in the same direction. The fifth toothed member is meshed with the third toothed member, the third toothed member drives the fifth toothed member to rotate, and the fifth toothed member is provided with a push block which is used for pushing the limiting member so that the limiting member moves from the first position to the second position. The steering piece comprises a pressing part, and when the pressing part is pressed upwards, the steering piece drives the limiting piece to move from the second position to the first position; when the pressing part is pressed downwards, the steering part drives the limiting part to move from the first position to the second position.

The above structure for preventing the locking of the transmission mechanism will be described in detail using the stapler as an example. Wherein the first toothed member is the third gear 183 of the stapler, the second toothed member is the rack 16 of the stapler, the third toothed member is the second gear 182 of the stapler, the fourth toothed member is the first gear 181 of the stapler, and the fifth toothed member is the fourth gear 184 of the stapler.

As shown in FIG. 1, the present invention relates to a stapler 100. Specifically, the stapler 100 includes a handle assembly 10, a shaft assembly 20 extending longitudinally from the handle assembly 10, and an end effector 30 disposed at one end of the shaft assembly. The stapler 100 further includes a fixed handle 40 extending downwardly from the bottom of the handle assembly 10, a closure trigger 50, and a firing trigger 60. Further, the terms "proximal", "posterior" and "distal", "anterior" as used herein are relative to a clinician manipulating handle assembly 10 of stapler 100. The terms "proximal" and "posterior" refer to the portions that are closer to the clinician, and the terms "distal" and "anterior" refer to the portions that are farther from the clinician. That is, the handle assembly 10 is proximal and the end effector 30 is distal, such that the proximal end of a component represents an end relatively close to the handle assembly 10 and the distal end represents an end relatively close to the end effector 30.

As shown in connection with fig. 2 and 3, the closure trigger 50 may be manipulated to position and close the end effector 30, with the end effector 30 being connected to the distal end of the shaft assembly 20. The end effector 30 includes a cartridge housing 31 and a staple abutment 32 pivotally coupled to the cartridge housing 31, the cartridge housing 31 for operably supporting a staple cartridge (not shown) therein, the staple abutment 32 being selectively movable between an open position and a closed position. Pressing the closure trigger 50 advances the shaft assembly 20 to pivot the abutment 32 to close the end effector 30. In a preferred embodiment, stapler 100 further includes a release button 70, by which release button 70 can be operated to release closure trigger 50, thereby opening end effector 30 for readjusting, clamping, and positioning tissue. When tissue to be treated is introduced between cartridge seat 31 and anvil 32, the surgeon may press closure trigger 50 until it is locked, thereby placing anvil 32 in the closed position, i.e., end effector 30 in the closed state.

The end effector 30 includes a cutting blade 33, the cutting blade 33 being operably supported relative to the cartridge housing 31, and in particular, in this embodiment, the cutting blade 33 includes opposite proximal and distal ends, wherein the proximal end of the cutting blade 33 is coupled to the firing bar 21 disposed within the shaft assembly 20 and the distal end of the cutting blade 33 is coupled to and movable from one end of the jaw member to the other end of the jaw member. The cutter 33 may be subjected to a firing force transmitted by the firing trigger 60, causing the cutter 33 to move from an unfired position to a distally fired position; it is also possible to retract from the fired position to the unfired position in response to a retraction force applied to the cutter blade 33. The conversion of the firing force to the retraction force may be accomplished by steering assembly 12. It should be noted that the firing and retraction movements of the cutting blade 33 must be allowed to occur with the jaw members closed, i.e., the firing trigger 60 can be actuated only when the closure trigger 50 is locked to the fixed handle 40 such that the anvil 32 is in the closed position, to prevent inadvertent actuation of the firing trigger 60 during surgery to cause the cutting blade 33 to cut non-target tissue.

As shown in connection with fig. 2-7, the handle assembly 10 includes a body 11, a steering assembly 12, and a transmission 13. The steering assembly 12 includes a steering member 14 and a stop member 15. The steering member 14 controls the switching of the limiter 15 between the first position and the second position. When the stop 15 is in the first position, the cutting blade 33 may be subjected to a firing force transmitted by the firing trigger 60, moving the cutting blade 33 from the unfired position to the distal fired position. When the stop 15 is in the second position, the cutter 33 may move the cutter 33 from the fired position to the unfired position proximally in response to a retraction force being applied to the cutter 33. The steering member 14 includes a first body portion 141, a first protrusion 142 and a second protrusion 143 protruding from the first body portion 141. A groove 144 is formed between the first bump 142 and the second bump 143. The steering member 14 further includes a pressing portion 145 protruding from the first body portion 141. The protruding direction of the first bump 142 and the protruding direction of the second bump 143 are the first direction, the protruding direction of the pressing portion 145 is the second direction, and the first direction is perpendicular to the second direction. The pressing portion 145 is pressed by an operator to switch the limiting member 15 between the first position and the second position. The stopper 15 includes a second body 151 and a projection 152 extending from the second body 151. Referring to fig. 10, the protrusion 152 is positioned in the recess 144. When the pressing portion 145 is pressed downward, the first protrusion 142 pushes the protrusion 152 to move the stopper 15 from the first position to the second position. When the pressing portion 145 is pressed upward, the second bump 143 pushes the protrusion 152 to move the stopper 15 from the second position to the first position.

As shown in connection with fig. 8 to 13, the transmission 13 comprises a rack 16, a thrust piece 17 and several gears 18. The rack 16 is connected to a firing bar 21, and the firing bar 21 is connected to a cutting blade 33. The rack 16 drives the firing bar 21 to move forwards or backwards, and the firing bar 21 drives the cutter 33 to move forwards or backwards, so that the cutter feeding or retracting is realized. The pushing member 17 is for pushing the rack 16 forward. The transmission mechanism 13 further includes a first rod 191, a second rod 192, a third rod 193, and a fourth rod 194 mounted on the body 11, wherein the first rod 191 and the second rod 192 are movably mounted on the body 11. The pushing member 17 is connected to the first rod 191, and the pushing member 17 is rotatable about the first rod 191. The pushing member 17 includes a third body 171, a protruding portion 172 protruding laterally from a side surface of the third body 171, a finger 173 protruding upward from a distal end of the third body 171, and an abutting portion 174 protruding upward from a head end of the third body 171. The first rod 191 is provided with a stop 195, the stop 195 being adapted to cooperate with the projection 172 so as to prevent rotation of the push member 17 about the first rod 191. The firing trigger 60 includes a movable handle 61 and a sector toothed cam 62, wherein the sector toothed cam 62 rotates synchronously with the pulling of the movable handle 61. The movable handle 61 is connected to the first rod 191. When the stop portion 195 is separated from the protruding portion 172, the movable handle 61 is triggered, and the movable handle 61 drives the first rod 191 to move forward, and the first rod 191 drives the pushing member 17 to move forward. The transmission mechanism 13 further includes a pull spring 80, the pull spring 80 is provided with a through hole 81, and the finger 173 of the pushing member 17 passes through the through hole 81. When the first rod 191 moves forward, the pull tab 80 pulls the finger 173 rearward, rotating the push member 17 clockwise into abutment with the rack 16. The bottom of the rack 16 is recessed upwardly to form a recessed aperture 160. The pushing member 17 rotates clockwise, so that the abutting portion 174 of the pushing member 17 extends into the concave hole 160, and the first rod 191 drives the pushing member 17 to move forward to push the rack 16 forward. The rack 16 pushes forward against the firing bar 21, thereby causing the cutting blade to move forward. The gears include a first gear 181, a second gear 182, a third gear 183, and a fourth gear 184. The first gear 181 and the second gear 182 are connected to the second rod 192, and the first gear 181 and the second gear 182 can rotate around the second rod 192. The second rod 192 is provided with a protruding ring 197 and a linkage protrusion 196 protruding from the protruding ring 197, and the linkage protrusion 196 is used for controlling the movement modes of the first gear 181 and the second gear 182. When the linkage projection 196 is only connected to the first gear 181 or the second gear 182, the first gear 181 and the second gear 182 are in a separated state, and the first gear 181 and the second gear 182 move independently and do not affect each other. When the linkage projection 196 is simultaneously connected to the first gear 181 and the second gear 182, the linkage projection 196 can cause the first gear 181 and the second gear 182 to cooperate with each other, i.e., the first gear 181 and the second gear 182 can realize the same rotation under the action of the linkage projection 196. The third gear 183 is connected to the third lever 193, and the third gear 183 is rotatable around the third lever 193. The fourth gear 184 is connected to the fourth lever 194, and the fourth gear 184 is rotatable about the fourth lever 194. Referring to fig. 6, the second gear 182 is simultaneously meshed with the third gear 183 and the fourth gear 184, that is, when any one of the second gear 182, the third gear 183 and the fourth gear 184 rotates, the other two gears are driven to rotate. The third gear 183 is meshed with the rack 16. Specifically, the third gear 183 includes integrally formed, synchronously rotating large and small gears, which are engaged with the second gear 182, and which are engaged with the rack 16, and for convenience of description, the large and small gears are collectively referred to as the third gear 183. Referring to fig. 5, the sector toothed cam 62 is engaged with the first gear 181.

The different modes of movement of the transmission 13 when the stop 15 is in the first and second positions, respectively, are described in detail below.

When the limiting member 15 is located at the first position, the first gear 181 and the second gear 182 are in a separated state, and the first gear 181 and the second gear 182 move independently and do not affect each other. Specifically, referring to fig. 11 and 12, the second body 151 of the limiting member 15 includes two vertical portions 153 disposed opposite to each other and a horizontal portion 154 connecting the two vertical portions 153. Two vertical portions 153 are located at both ends of the second bar 192. One end of the second rod 192 abuts against the vertical portion 153 on one side of the limiting member 15, and the other end abuts against the first body portion 141 of the steering member 14. The second rod 192 is sleeved with a spring 198, one end of the spring 198 is pressed against the protruding ring 197, and the other end is pressed against the first main body 141 of the steering member 14. The first gear 181 and the second gear 182 are both connected to the protruding ring 197 of the second lever 192, and the second gear 182 is located between the first gear 181 and the first body portion 141 of the steering member 14, and the link projection 196 is only connected to the second gear 182 and is not connected to the first gear 181. The trigger 60 is actuated, the movable handle 61 rotates anticlockwise, so that the first rod 191 is driven to move forwards, the first rod 191 drives the pushing piece 17 to move forwards, meanwhile, the pull reed 80 pulls the pushing piece 17 backwards, the pushing piece 17 rotates clockwise, the abutting part 174 stretches into the concave hole 160 of the rack 16 and pushes the rack 16 forwards, and the rack 16 pushes the cutter 33 to move forwards, so that feeding is achieved. When the rack 16 moves forward for a certain stroke, the firing trigger 60 is actuated again, and the above process is repeated, and the rack 16 is pushed by the pushing member 17 to move forward again. When the rack 16 moves forward, the rack 16 drives the third gear 183 to rotate clockwise, the third gear 183 drives the second gear 182 to rotate counterclockwise, and the second gear 182 drives the fourth gear 184 to rotate clockwise. Referring to fig. 11 to 12, the fourth gear 184 is provided with a push block 185, and the push block 185 is configured to push against the horizontal portion 154 of the second body 151 of the limiting member 15, so as to move the limiting member 15 downward. As the fourth gear 184 rotates, the push block 185 also rotates, abutting against the horizontal portion 154 of the limiter 15 and pressing the limiter 15 downward, i.e., the push block 185 presses the limiter 15 downward as the rack 16 moves forward until it is in place. The pushing block 185 pushes the limiting member 15 downward, so that the limiting member 15 moves from the first position to the second position, and the limiting member 15 drives the steering member 14 to move downward through the convex portion 152. When the limiting member 15 moves from the first position to the second position, the vertical portion 153 of the second body portion 151 of the limiting member 15 is separated from one end of the second rod member 192, and due to the spring 198 disposed between the other end of the second rod member 192 and the first body portion 141 of the steering member 14, the second rod member 192 moves towards the direction away from the first body portion 141 of the steering member 14 under the action of the spring 198, and at this time, the linkage protrusion 196 connects the first gear 181 with the second gear 182, that is, the first gear 181 and the second gear 182 cooperate with each other, so as to realize the same-direction rotation. The firing trigger 60 is released and the pusher 17 returns to the starting position. Referring to fig. 9, 10 and 12, when the limiting member 15 moves from the first position to the second position, the vertical portion 153 on one side of the limiting member 15 is separated from one end of the first rod 191, and the vertical portion 153 on the same side of the steering member 14 moves downward to the other end of the first rod 191 and pushes the first rod 191, so that the first rod 191 moves in a direction away from the first body portion 141 of the steering member 14, such that the stop portion 195 moves to the protruding portion 172 and cooperates with the protruding portion 172, such that the pushing member 17 cannot rotate clockwise around the first rod 191 under the action of external force, i.e. the pushing member 17 cannot push the rack 16 forward under the action of external force. That is, when the limiting member 15 is at the first position, the vertical portion 153 on one side of the limiting member 15 simultaneously presses against one end of the first rod 191 and one end of the second rod 192; when the limiting member 15 is in the second position, the vertical portion 153 is separated from one end of the first rod 191 and one end of the second rod 192 at the same time, so that the first rod 191 and the second rod 192 both move in a direction away from the first body portion 141 of the steering member 14. The movement of the first rod 191 causes the stop 195 on the first rod 191 to cooperate with the projection 172 on the abutment 17; movement of the second lever 192 causes the first gear 18l to be in linkage with the second gear 182. When the limiting member 15 is at the second position, the trigger 60 is actuated, the movable handle 61 does not act on the pushing member 17 any more, the fan-shaped toothed cam 62 drives the first gear 181 to rotate clockwise, the second gear 182 is linked with the first gear 181, i.e. the second gear 182 also rotates clockwise, the second gear 182 drives the third gear 183 to rotate anticlockwise, and the third gear 183 drives the rack 16 to move backwards, so that the retracting of the knife is realized. During the retracting process, the rack 16 is easily caught between the third gear 183, so that the rack 16 cannot continue to move rearward. At this time, the operator can manually press the pressing portion 145 of the steering member 14 upward, and the second projection 143 of the steering member 14 presses the projection 152 upward, so that the stopper 15 moves from the second position to the first position. At this time, the vertical portion 153 of the stopper 15 located at the same side of the steering member 14 is separated from one end of the first rod 191, and the vertical portion 153 of the other side of the stopper 15 acts on the other end of the first rod 191, so that the first rod 191 moves toward the steering member 14 to separate the stopper 195 from the protrusion 172. The second rod 192 also moves toward the steering member 14 due to the pressing of the vertical portion 153 of the limiting member 15, so that the linkage protrusion 196 is disengaged from the first gear 181. The pushing member 17 can rotate clockwise and move forward under the action of the movable handle 61, the first rod 191 and the pull spring 80, so as to push the rack 16 to move forward, and the rack 16 gets out of the clamping state with the third gear 183. Specifically, when the rack 16 moves forward, the rack 16 drives the second, third and fourth gears 182, 183, 184 to move so as to drive the limiting member 15 to move from the first position to the second position, and when the limiting member 15 moves to the second position, the protruding portion 172 cooperates with the stop portion 195 to prevent the pushing member 17 from rotating clockwise, the linkage protrusion 196 makes the first gear 181 and the second gear 182 rotate in the same direction, at this time, the firing trigger 60 is actuated again, and the first, second, third gears 181, 182, 183 and the rack 16 can be driven to move by the fan-shaped toothed cam 62, so that the rack 16 moves backward. The operator manually presses the pressing portion 145 of the steering member 14 upward or downward, so that the first and second protrusions 142 and 143 control the switching of the stopper 15 between the first and second positions, thereby manually controlling the forward and backward movement of the rack 16, i.e., the feeding and retracting of the knife. By the design, the problem that the rack 16 and the third gear 183 cannot move continuously due to clamping is solved.

In summary, the steering element 14 is utilized to control the position of the limiting element 15, the position of the limiting element 15 determines the movement mode of the transmission mechanism, and the movement mode of the transmission mechanism determines the movement direction of the cutting knife. When the rack and the gear are clamped in the retracting process, an operator can manually control the steering piece 14 to drive the limiting piece 15 to move from the second position to the first position, and the gear and the rack are reversely moved by forward feeding so as to release the clamping, so that the operation is simple, safe and reliable.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (32)

1. The utility model provides a prevent dead structure of drive mechanism card, drive mechanism includes first toothed member, second toothed member and pushes away the piece, first toothed member with the second toothed member meshes, its characterized in that: the structure comprises a steering part and a limiting part, wherein the steering part comprises a groove, the limiting part comprises a convex part, and the convex part is at least partially positioned in the groove; the limiting piece is provided with a first position and a second position, and when the limiting piece is positioned at the first position, the pushing piece drives the second toothed piece to move along a second direction;

The pushing piece drives the second toothed piece to move along the second direction, the groove pushes the convex part along the third direction, and the limiting piece gradually moves from the first position to the second position;

when the limiting piece is positioned at the second position, the first toothed piece drives the second toothed piece to move along a first direction, wherein the second direction is opposite to the first direction; the groove pushes against the convex part along a third direction, so that the limiting part moves from the first position to the second position, and the groove pushes against the convex part along a fourth direction opposite to the third direction, so that the limiting part moves from the second position to the first position.

2. The structure for preventing seizure of a transmission according to claim 1, characterized in that: the steering piece comprises a first main body part, a first lug and a second lug, wherein the first lug and the second lug protrude from the first main body part, the groove is formed between the first lug and the second lug, and the limiting piece comprises a second main body part and a convex part extending from the second main body part.

3. The structure for preventing the transmission from being locked according to claim 2, wherein: the steering piece further comprises a pressing part protruding from the first main body part, and the protruding direction of the pressing part is perpendicular to the protruding directions of the first protruding block and the second protruding block.

4. A structure for preventing a transmission from seizing up as set forth in claim 3, wherein: when the pressing part is pressed along the fourth direction, the second bump pushes the convex part to move the limiting piece from the second position to the first position; when the pressing portion is pressed in the third direction, the first bump pushes against the protruding portion to move the stopper from the first position to the second position.

5. The structure for preventing seizure of a transmission according to claim 1, characterized in that: the transmission mechanism further comprises a movable handle, and the movable handle provides external force to enable the pushing piece to drive the second toothed piece to move along the second direction.

6. The structure for preventing seizure of a transmission as set forth in claim 5, wherein: the transmission mechanism further comprises a fan-shaped toothed cam, and the fan-shaped toothed cam provides an external force to enable the first toothed member to drive the second toothed member to move along the first direction.

7. The structure for preventing seizure of a transmission as defined in claim 6, wherein: the fan-shaped toothed cam and the movable handle synchronously rotate.

8. The structure for preventing seizure of a transmission as set forth in claim 5, wherein: the transmission mechanism further comprises a first rod piece, the movable handle and the pushing piece are connected to the first rod piece, the movable handle drives the first rod piece to move along the second direction, the first rod piece drives the pushing piece to move along the second direction, and the pushing piece pushes the second toothed piece forwards along the second direction.

9. The structure for preventing seizure of transmission mechanism as set forth in claim 8, wherein: the transmission mechanism further comprises a pull spring piece, the pull spring piece is connected to the pushing piece, and when the first rod piece drives the pushing piece to advance, the pull spring piece pulls the pushing piece backwards so that the pushing piece rotates to be abutted with the second toothed piece.

10. The structure for preventing seizure of transmission mechanism as set forth in claim 9, wherein: the pushing piece comprises a third main body part and a protruding part protruding from the third main body part, the first rod piece is provided with a stop part, and when the limiting piece is located at the second position, the stop part is matched with the protruding part so that the pushing piece cannot rotate around the first rod piece.

11. The structure for preventing seizure of a transmission as defined in claim 6, wherein: the transmission mechanism further comprises a third toothed member, a fourth toothed member and a second rod member, wherein the third toothed member and the fourth toothed member are both connected to the second rod member, the second rod member is provided with a linkage lug, the third toothed member is meshed with the first toothed member, and the fourth toothed member is meshed with the fan-shaped toothed cam.

12. The structure for preventing seizure of transmission mechanism as recited in claim 11, wherein: when the limiting piece is positioned at the first position, the linkage lug is only connected with the third toothed piece, and the third toothed piece and the fourth toothed piece rotate independently; when the limiting piece is located at the second position, the linkage protruding block is simultaneously connected to the third toothed piece and the fourth toothed piece, and the third toothed piece and the fourth toothed piece rotate in the same direction.

13. The structure for preventing seizure of transmission mechanism as recited in claim 11, wherein: the transmission mechanism further comprises a fifth toothed member, the fifth toothed member is meshed with the third toothed member, the third toothed member drives the fifth toothed member to rotate, the fifth toothed member is provided with a push block, and the push block is used for pushing the limiting member to enable the limiting member to move from the first position to the second position.

14. The structure for preventing seizure of a transmission as set forth in claim 13, wherein: the limiting piece comprises two vertical parts and a horizontal part, wherein the two vertical parts are oppositely arranged, the horizontal part is connected with the two vertical parts, and the pushing block is used for pushing the horizontal part.

15. The structure for preventing seizure of a transmission according to claim 1, characterized in that: the recess is generally U-shaped.

16. A structure for preventing seizure of a transmission mechanism as defined in any one of claims 1 to 15, wherein: the toothed member is a gear or a rack; the movement includes both rotation and movement.

17. The utility model provides an anastomat, its includes handle subassembly, follow handle subassembly along the shaft subassembly of longitudinal extension and set up in the end effector of shaft subassembly distal end, end effector includes the cutting knife, be equipped with the firing bar in the shaft subassembly, the cutting knife with the firing bar is connected, its characterized in that: the handle assembly comprises a transmission mechanism and a structure for preventing the transmission mechanism from being blocked, wherein the structure is as claimed in any one of claims 1-16, and the firing bar is connected with the second toothed member.

18. The utility model provides a cutting knife drive arrangement for anastomat, its includes drive mechanism and turns to the subassembly, turn to the subassembly and include steering piece and locating part, its characterized in that: the limiting piece is provided with a first position and a second position, when the limiting piece is positioned at the first position, the transmission mechanism drives the cutting knife to move forwards, and when the limiting piece is positioned at the second position, the transmission mechanism drives the cutting knife to move backwards; the steering member comprises a first driving structure for driving the limiting member to move from the first position to the second position, and a second driving structure for driving the limiting member to move from the second position to the first position;

And the first driving structure drives the limiting piece to move from the first position to the second position in response to the driving mechanism driving the cutting knife to move forwards.

19. The knife driving device for anastomat according to claim 18, wherein: the first driving structure is a first bump, the second driving structure is a second bump, a groove is formed between the first bump and the second bump, the limiting piece comprises a protruding portion, and the protruding portion is at least partially accommodated in the groove.

20. The knife driving device for anastomat according to claim 19, wherein: the steering piece further comprises a first main body part, and the first lug and the second lug both protrude from the first main body part; the limiting piece comprises a second main body part and the convex part extending from the second main body part.

21. The knife driving device for anastomat according to claim 20, wherein: the steering piece further comprises a pressing part protruding from the first main body part; when the pressing part is pressed downwards, the first lug pushes against the protruding part to enable the limiting piece to move from the first position to the second position, and when the pressing part is pressed upwards, the second lug pushes against the protruding part to enable the limiting piece to move from the second position to the first position.

22. The knife driving device for anastomat according to claim 18, wherein: the transmission mechanism comprises a first rod piece, a pushing piece and a rack, wherein the rack is connected with the cutting knife, the pushing piece is connected with the first rod piece, and the pushing piece can rotate around the first rod piece to be abutted with the rack and push the rack forwards.

23. The knife driving device for anastomat according to claim 22, wherein: the anastomat comprises a firing trigger, the firing trigger is connected with the first rod piece, when the limiting piece is positioned at the first position, the firing trigger fires, the firing trigger drives the first rod piece to move forwards, and the first rod piece drives the pushing piece to move forwards.

24. The knife driving device for anastomat according to claim 23, wherein: the transmission mechanism further comprises a pull reed, the tension spring piece is connected to the pushing piece, and when the first rod piece drives the pushing piece to move forwards, the tension spring piece pulls the pushing piece backwards so that the pushing piece rotates to be abutted with the rack.

25. The knife driving device for anastomat according to claim 22, wherein: the pushing part comprises a third main body part and a protruding part protruding from the third main body part, the first rod piece is provided with a stop part, and when the stop part is positioned at the second position, the stop part pushes one end of the first rod piece along the extending direction of the first rod piece so as to enable the stop part to be matched with the protruding part.

26. The knife driving device for anastomat according to claim 23, wherein: the transmission mechanism further comprises a plurality of gears, the gears comprise a first gear connected with the firing trigger, a third gear meshed with the rack and a second gear meshed with the third gear, and the firing trigger drives the rack through transmission among the gears.

27. The knife driving device for anastomat according to claim 26, wherein: the transmission mechanism further comprises a second rod piece, the first gear and the second gear are both connected to the second rod piece, when the limiting piece is located at the first position, the first gear and the second gear rotate independently, and when the limiting piece is located at the second position, the first gear and the second gear rotate synchronously.

28. The knife driving device for anastomat according to claim 27, wherein: the second rod piece is provided with a linkage protruding block, when the linkage protruding block is only connected with the first gear or the second gear, the first gear and the second gear rotate independently, and when the linkage protruding block is simultaneously connected with the first gear and the second gear, the first gear and the second gear rotate synchronously.

29. The knife driving device for anastomat according to claim 26, wherein: the gears further comprise a fourth gear, the fourth gear is meshed with the second gear, the fourth gear is provided with a pushing block, and the pushing block is used for pushing the limiting piece.

30. The knife driving device for anastomat according to claim 29, wherein: the limiting piece comprises two vertical parts and a horizontal part, wherein the two vertical parts are oppositely arranged, the horizontal part is connected with the two vertical parts, and the pushing block is used for pushing the horizontal part.

31. The knife driving device for anastomat according to claim 18, wherein: the anastomat comprises a firing bar, the cutting knife is connected with the distal end of the firing bar, and the transmission mechanism is connected with the proximal end of the firing bar.

32. The utility model provides an anastomat, its includes handle subassembly, follow handle subassembly along the shaft subassembly of longitudinal extension and set up in the end effector of shaft subassembly distal end, end effector includes the cutting knife, be equipped with the firing bar in the shaft subassembly, the cutting knife with the firing bar is connected, its characterized in that: the handle assembly comprises the cutter driving device for the anastomat according to any one of claims 18-31, and the firing bar is connected with a transmission mechanism of the cutter driving device for the anastomat.