CN117398144A - Surgical instrument - Google Patents

Abstract

A surgical instrument has a drive assembly having a first state coupled to a motorized module and a second state decoupled from the motorized module; in the first state, the electric module drives the transmission assembly to advance or retreat through the driving assembly; the tool retracting mechanism comprises a fixing piece and a first operating piece; the first operating member is operated to perform a first movement to drive the driving assembly to switch from the first state to the second state; the fixing piece comprises a first thread structure, the first operating piece comprises a second thread structure, and the first thread structure is matched with the second thread structure to guide the first operating piece to perform first movement; in the second state, the first operating member is operated to perform a second motion to drive the driving assembly to move, and further drive the transmission assembly to retreat. The cutting knife assembly can be returned to the initial position in an emergency state, unnecessary accidents are avoided, different functional requirements of surgical instruments are met, the operation is labor-saving, the use of doctors is convenient, and the whole structure is simple, safe and reliable.

Description

Surgical instrument

Technical Field

The invention relates to the technical field of medical instruments, in particular to a surgical instrument.

Background

The anastomat suitable for the surgical operation is a surgical cutting anastomat which can cut off redundant tissues while suturing wounds of patients, and is widely applied to tissue cutting and anastomosis in minimally invasive operations such as abdominal surgery, gynecology, pediatrics, chest surgery and the like. Surgical cutting staplers sever and staple tissue by accessing a patient through a cannula of a penetrator that is precisely positioned at a surgical site, then making a longitudinal incision in the tissue and applying staples on opposite sides of the incision. The stapler comprises an end effector, wherein the end effector comprises a nail bin seat and a nail abutting seat, and the nail bin seat is used for receiving a nail bin assembly; the nail bin assembly comprises a nail bin body and a plurality of staples arranged in the nail bin body, wherein the nail bin body is internally provided with a plurality of staples used for containing the staples, the nail bin body comprises a top end face, and a staple outlet formed by the staples penetrating through the top end face is formed in the top end face.

Once the surgeon determines that the end effector is clamping the target tissue, the surgical cutting stapler can be fired to sever and staple the tissue. When stapling, the top end surface contacts the tissue to be stapled, and a cutting member in the surgical cutting stapler pushes a wedge-shaped staple pushing piece in the staple cartridge to move, so that a staple driver drives staples in the staple cartridge to move upwards from the staple cavities to pierce and staple target tissue (i.e. staples out).

The motor may power the surgical instrument. When a doctor fires the surgical instrument, the motor rotates forward to enable the cutting knife to synchronously push the nail pushing block of the nail bin assembly to move from the initial position to the end position, so that the cut tissue is sutured while the redundant tissue is cut. The motor is also capable of reversing to reset the cutting blade to a second initial position to withdraw the upper ear from the staple holder pocket of the staple holder to open the end effector, unclamp tissue, reclose the end effector, and remove the surgical instrument from the penetration cannula.

However, when the motor fails, or the battery or other power source powering the motor fails, and sufficient power is not provided to the surgical instrument, the instrument must be immediately removed and replaced with a new instrument. At this time, the end effector of the surgical instrument may be locked, and the upper ear of the cutting blade may be positioned in the staple holder pocket, such that the end effector cannot be opened, and the clamped tissue cannot be disengaged from the end effector, resulting in the surgical instrument not being removed from the cannula of the penetrator. At this time, it is necessary to enlarge the puncture hole or to shift to an open surgery, and even to cause a medical accident.

Accordingly, there is a need for a retracting mechanism that can retract the cutter assembly to an initial position in an emergency to withdraw the upper ear from the abutment pocket of the abutment to thereby relieve the end effector from being opened.

In the prior art, when a surgical instrument breaks down and causes the motor to suddenly stop, the tool retracting mechanism is directly pressed, so that the driving gear is separated from the input gear of the motor, or the driving gear is separated from the rack, and then the rack is driven to move through the tool retracting mechanism. In this way, a significant amount of pressing force is required to disengage the drive gear from the input gear, or the drive gear from the rack, resulting in a difficult operation of the retracting mechanism, thereby affecting the normal use of the surgical cutting stapler and increasing the risk of surgery. In addition, the tool retracting mechanism in the prior art has more parts, complex structure and low reliability.

Therefore, there is a need for a retracting mechanism that overcomes the above-described drawbacks.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a surgical instrument, which solves the problems that the operation difficulty of a tool retracting mechanism is large and the surgical risk is increased.

The invention is realized by the following technical scheme:

a surgical instrument comprising a power module, a drive assembly, a transmission assembly, and a retracting mechanism, the drive assembly being connected to the transmission assembly;

the drive assembly has a first state connected with the electric module and a second state separated from the electric module; in the first state, the electric module drives the transmission assembly to advance or retreat through the driving assembly; the tool retracting mechanism comprises a fixing piece and a first operating piece; the first operating member is operated to perform a first movement to drive the drive assembly to switch from the first state to the second state; the mount includes a first threaded structure, the first operating member includes a second threaded structure, the first threaded structure mates with the second threaded structure to cause the first operating member to perform the first movement in response to being operated; in the second state, the first operating member is operated to perform second movement to drive the driving assembly to move, and further drive the transmission assembly to retreat.

Further, the fixing piece is provided with a cavity, the first operating piece penetrates through the cavity, the first thread structure is arranged on the inner wall of the cavity, and the second thread structure is arranged on the outer wall of the first operating piece.

Further, the driving assembly comprises a rotating shaft and a driving piece, the driving piece is sleeved on the rotating shaft, and the driving piece is connected with the transmission assembly; in the first state, the driving piece is connected with the electric module; in the second state, the driving member is separated from the electric module; the first operating member is operated to perform a first movement to drive the driving member to move in an axial direction of the rotation shaft to switch the driving member from the first state to the second state; and in the second state, the first operating member is operated to drive the rotating shaft to rotate, so that the driving member is driven to move, and the transmission assembly is driven to retreat.

Further, the first operating member has a first structure, and the rotating shaft has a second structure; the first and second structures cooperate to lock the first operating member with the rotary shaft in the second state so that the rotary shaft can be driven to rotate by the first operating member.

Further, the first structure is a third thread structure, the second structure is a fourth thread structure, and the third thread structure and the fourth thread structure cooperate to lock the first operating member with the rotation shaft.

Further, the first operation piece is provided with a first accommodating cavity, and the inner wall of the first accommodating cavity is provided with the third thread structure; the first end of the rotating shaft is arranged in the first accommodating cavity, the first end is provided with the fourth thread structure, the second end of the rotating shaft is rotatably arranged on the seat body of the surgical instrument in a penetrating mode, and the second end is axially fixed with the seat body.

Further, the first operating member is disposed coaxially with the rotational shaft.

Further, a key is arranged on the outer side of the rotating shaft, a key groove is arranged on the inner side of the driving piece, and the key groove are matched to enable the rotating shaft to drive the driving piece to move when in the second state.

Further, the key is in a strip shape; the keyway slides along the key as the driver moves axially along the rotational axis.

Further, the retracting mechanism further comprises a second operating piece; the second operating member is detachably connected with the first operating member, and the second operating member drives the first operating member to do the first movement and the second movement in the same direction.

Further, the driving assembly comprises a first gear and a second gear, and in the first state, the first gear is connected with the transmission assembly, and the second gear is connected with the electric module; in the second state, the first gear is connected with the transmission assembly, and the second gear is separated from the electric module.

Further, the transmission assembly includes a rack and a cutter assembly coupled to the rack.

The invention has the beneficial effects that: the surgical instrument can be normally used for cutting and suturing target tissues, the cutting component can be returned to the initial position in an emergency state, unnecessary accidents are avoided, different functional requirements of the surgical instrument are met, the first operating piece is guided to move through the thread structure when operated so as to realize the disconnection of the driving component and the electric module, and compared with the modes of direct pressing or cam pressing, the surgical instrument is more labor-saving, convenient for doctors to use, and the surgical instrument has a simpler overall structure, is safe and reliable; on the other hand, under normal conditions, the motor drives the cutter assembly to move through the driving assembly, and under emergency conditions, the first operation piece is operated to drive the same driving assembly to realize the retreating of the cutter assembly, so that an additional structure is not needed, the transmission mechanism of the anastomat is simplified, the structural design is reasonable, the volume of the whole machine is reduced, and the weight of the whole machine is reduced.

Drawings

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

FIG. 2 is an exploded perspective view of a portion of the cutting drive mechanism of the surgical instrument illustrated in FIG. 1;

FIG. 3 is a schematic illustration of a portion of the mechanism of the surgical instrument illustrated in FIG. 1;

FIG. 4 is an exploded view of the retracting mechanism and drive assembly shown in FIG. 3;

FIG. 5 is a schematic view of a perspective view of a first operating member of the surgical instrument illustrated in FIG. 1;

FIG. 6 is another perspective view of the first operating member illustrated in FIG. 5;

FIG. 7 is a schematic illustration of the construction of a second operating member of the surgical instrument illustrated in FIG. 1;

FIG. 8 is a schematic view of the drive member of the surgical instrument illustrated in FIG. 1;

fig. 9-11 are schematic diagrams of a change in state of the retracting mechanism and drive assembly of the surgical instrument of fig. 1.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be appreciated that the terms "proximal", "rear" and "distal", "front" are used herein with respect to a clinician manipulating a handle of a stapler. 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. I.e., the handle is proximal and the end effector is distal, if the proximal end of a component is shown relatively near the end of the handle, the distal end is shown relatively near the end of the end effector. The terms "upper" and "lower" refer to the relative positions of the staple abutment and the cartridge seat of the end effector, specifically the staple abutment being "upper" and the cartridge seat being "lower". However, the stapler can be used in many orientations and positions, and thus these terms expressing relative positional relationships are not limiting and absolute.

In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, movably connected, or integrated, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two elements or interaction relationship between the two elements such as abutting. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. It should be noted that, when the terms "connected" and "connected" are used in the meanings defined by the corresponding terms, only the cases where the terms are clearly required are excluded, and other possible cases are not excluded, such as "detachably connected" means detachably connected, not including being integrated, but movable connection and the like are not excluded.

In this embodiment, a surgical instrument is specifically illustrated as stapler 100.

Referring to fig. 1 to 8, a stapler 100 includes a main body 10, a shaft assembly 20 extending from the main body 10, and an end effector 30 disposed at a distal end of the shaft assembly 20. The shaft assembly 20 includes a sleeve 21 and a mandrel 23 received in the sleeve 21. The end effector 30 includes a cartridge housing 31, a staple cartridge housing 32, and a cartridge assembly (not shown), the cartridge housing 31 being pivotally connected to the staple cartridge housing 32, the cartridge housing 31 being operable to support the cartridge assembly therein, the staple cartridge housing 32 being selectively movable between an open position and a closed position to cooperate with the cartridge housing 31 and the cartridge assembly to loosen or clamp tissue.

Stapler 100 also includes a motorized module and a cutting drive mechanism. The electric module 40 includes a motor 41 and an input member 42 connected to the motor 41; the cutting drive mechanism comprises a drive assembly 29 and a transmission assembly driven by the drive assembly 29, and the motor 41 drives the drive assembly 29 through an input member 42 to move, thereby driving the transmission assembly to move. Wherein the transmission assembly comprises a transmission member 22, a mandrel 23 and a cutter assembly 24, wherein the proximal end of the mandrel 23 is connected with the transmission member 22, and the distal end is connected with the cutter assembly 24. The cutter assembly 24 is used for cutting tissue, the cutter assembly 24 includes a cutter bar 25 and a cutter 26 connected to the cutter bar 25, the advance of the cutter assembly 24 is referred to as feeding, and the retreat of the cutter assembly 24 is referred to as retracting. The cartridge assembly is provided with a feed slot for movement of the cutter 26, the feed slot being arranged along the length direction of the cartridge assembly, the cartridge seat 31 being provided with a cartridge seat slot (not shown) along its length direction, the abutment seat 32 being provided with a guide slot along its length direction. The cutting knife 26 includes ear 27 and joint portion 28 on, and ear 27 is located the cutting knife upside, and joint portion 28 is located the cutting knife downside, and joint portion 28 corresponds with ear 27's position on, and ear 27 and joint portion 28 form the I shape, and nail storehouse seat groove, support nail seat groove and the feed pocket of nail storehouse subassembly and provide accommodation space and route direction for cutting knife 26 jointly. The nail bin seat groove (not shown) is matched with the clamping part 28, the guide groove is matched with the upper lug part 27, so that a movement channel is provided for the clamping part 28 and the upper lug part 27 respectively, the shape of the upper lug part 27 is matched with the shape of the guide groove, the shape of the clamping part 28 is matched with the shape of the nail bin seat groove (not shown), and the shape of the clamping part 28 is matched with the shape of the nail bin seat groove, so that the cutting knife 26 can be prevented from shaking by the shape matching of the clamping part and the upper lug part 27. The upper ear 27 is positioned in a guide slot that provides a path guide for forward or rearward movement of the upper ear 27 during feed and retract. Meanwhile, the guide groove limits the movement of the upper ear 27 in the up-down direction, so that the upper ear 27 cannot be separated from the guide groove during the feeding and retracting processes, so that the cutter 26 limits the movement of the nail abutment to the direction of the open position, and the end effector cannot be opened at this time. The upper ear 27 does not enter or disengage from the guide slot before or after the feed is completed, and the cutter does not limit the movement of the abutment, at which time the end effector can be selectively moved between the open and closed positions.

The motor 41 drives the drive assembly 29 through the input member 42 to effect movement of the cutter assembly 24. Stapler 100 further includes an end effector drive mechanism that drives staple abutment 32 of end effector 30 to pivot relative to cartridge housing 31 for selective movement between a closed position and an open position. Generally, the end effector drive mechanism includes a gear, a cam, and a sleeve, the gear driving the sleeve 21 for linear movement by cam translation, the sleeve 21 for linear movement driving the anvil 32 for pivoting by the translation mechanism. The specific construction of the end effector drive mechanism is the same or similar to that of the prior art and will not be described in detail.

In use of stapler 100, first, end effector drive mechanism drives sleeve 21 and thus staple holder 32 to pivot to cooperate with the staple cartridge assembly to clamp a target tissue; then, the motor 41 is started and rotates positively, the cutter assembly 24 is driven to feed by the driving assembly 29, the cutter assembly 24 moves from the initial position to the end position to cut tissues, and the cutter assembly 24 synchronously pushes the nail pushing block in the nail bin assembly to move from the initial position to the end position, so that the effect of suturing the cut tissues is realized while the tissues are cut; subsequently, the motor 41 is reversed, and the cutter assembly 24 is driven to retract to the initial position by the drive assembly 29; then, the end effector driving mechanism drives the sleeve 21 to drive the nail propping seat 32 to open so as to loosen the tissue; finally, the end effector drive drives the sleeve 21 to drive the anvil 32 closed. Of course, before and after the stapler 100 is used, the nail pushing seat 32 needs to be closed relative to the nail cartridge seat 21, so that the end effector 30 extends into or is taken out from the patient through the puncture cannula, and no description is repeated.

In this embodiment, stapler 100 further includes a retracting mechanism. The driving assembly 29 is connected with the transmission assembly; the driving assembly 29 has a first state connected with the electric module 40 and a second state separated from the electric module 40, and in the first state, the electric module 40 drives the transmission assembly to advance or retreat through the driving assembly 29; specifically, as can be seen from the above, the electric module 40 includes a motor 41 and an input member 42 driven by the motor 41, and the driving assembly 29 has a first state connected to the input member 42 and a second state separated from the input member 42, and in the first state, the input member 42 drives the transmission assembly to advance or retract through the driving assembly 29. The retracting mechanism includes a fixing member 50 and a first operating member 51; the first operating member 51 is operated to make a first movement to drive the driving assembly 29 to switch from the first state to the second state; the fixing member 50 includes a first screw structure 52, and the first operating member 51 includes a second screw structure 53, and the first screw structure 52 is screw-engaged with the second screw structure 53 such that the first operating member 51 performs a first movement in response to being operated; in the second state, the first operating member 51 is operated to move in a second direction to drive the drive assembly 29 and thus the transmission assembly back. The first spiral structure 52 and the second spiral structure 53 are matched to guide the first operation member 51 to perform the first motion so as to disconnect the driving assembly 29 from the electric module 40, so that compared with the direct pressing mode and the like, the electric module is more labor-saving, convenient for doctors to use, and has simpler overall structure, safety and reliability; on the other hand, the motor 41 drives the cutter assembly 24 to move through the driving assembly 29 under normal conditions, and in emergency conditions, the first operating member 51 is operated to drive the same driving assembly 29 to retract the cutter assembly 24, so that an additional structure is not needed, the transmission mechanism of the anastomat 100 is simplified, the structural design is reasonable, the whole machine volume is reduced, and the weight of the whole machine is reduced.

Specifically, in this embodiment, the fixing element 50 is disposed on the body of the anastomat 100, and has a cavity, the first operating element 51 is disposed through the cavity, the first thread structure 52 is disposed on the inner wall of the cavity, and the second thread structure 53 is disposed on the outer wall of the first operating element 51. By the design, the whole structure of the anastomat 100 is more compact, the space utilization rate is improved, and the whole size of the anastomat 100 is reduced.

The driving component 29 comprises a driving piece 33 and a rotating shaft 35, specifically, the driving piece 33 is sleeved on the rotating shaft 35, and the driving piece 33 is connected with the transmission component; in the first state, the driving member 33 is connected with the input member 42; in the second state, the driving member 33 is separated from the input member 42; the first operating member 51 is operated to perform a first movement to drive the driving member 33 to move in the axial direction of the rotation shaft 35 to switch the driving member 33 from the first state to the second state; wherein the first movement comprises a downward movement, the first operating member 51 is operated to move downwardly from its initial position, during which movement the first operating member 51 abuts the driving member 33 to drive the driving member 33 from a first position connected to the input member 42 to a second position separated from the input member 42, i.e. in which the driving assembly 29 is disconnected from the electric module 40. And in the second state, the first operating member 51 is operated to perform a second movement to drive the rotation shaft 35 to rotate, thereby driving the driving member 33 to move, wherein the second movement includes a rotational movement. The driving member 33 has a central hole 37 extending in the axial direction and penetrating both side end surfaces, the central hole 37 is fitted over the rotation shaft 35, a key groove 38 is provided in the inner wall of the central hole 37 in the axial direction, a key 43 is provided on the outer side of the rotation shaft 35, and the key groove 38 of the driving member 33 moves downward along the key 43 of the rotation shaft 35 in the course that the driving member 33 is driven by the first operating member 51 to move in the axial direction of the rotation shaft 35 from the first position connected with the input member 42 to the second position separated from the input member 42; in the second state, the rotating shaft 35 is driven to transmit torque to the driving member 33 through the key 43, i.e., the key 43 and the key slot 38 cooperate such that the rotating shaft 35 can drive the driving member 33 and thus the transmission assembly. In this embodiment, for more stability when the rotation shaft 35 drives the driving member 33, the key 43 is elongated, and the key groove 38 is a groove having a square cross section, and the cross section is a plane taken in a direction perpendicular to the central axis of the driving member 33. The first operating member 51 has a first configuration and the rotary shaft 35 has a second configuration; the first and second structures cooperate to lock the first operating member 51 with the rotation shaft 35 in the second state, so that the rotation shaft 35 can be driven to rotate by the first operating member 51. Wherein the first structure is a third thread structure 54 and the second structure is a fourth thread structure 55, the third thread structure 54 and the fourth thread structure 55 cooperate to lock the first operating member 51 with the rotation shaft 35. In the first state, the third screw structure 54 and the fourth screw structure 55 are not combined, and the third screw structure 54 and the fourth screw structure 55 are engaged, and the first operating member 51 is movable with respect to the rotation shaft 35 during the first operating member 51 is operated to be rotated downward from the initial position to switch the driving member 33 from the first state to the second state; when in the second state, the third screw structure 54 is locked with the fourth screw structure 55 as the first operating member 51 moves, so that the first operating member 51 is locked with the rotation shaft 35, and the rotation shaft 35 can be driven to rotate by the first operating member 51, thereby driving the driving member 33 to move. Therefore, no complex structure is needed, and the whole transmission is more stable and reliable only through the thread structure and the key structure. In order to make the overall structure more compact, the first operating member 51 is disposed coaxially with the rotation shaft 35. The first operating member 51 has a first accommodating cavity, a portion of an inner wall of the first accommodating cavity is provided with a third thread structure 54, a first end of the rotation shaft 35 is disposed in the first accommodating cavity, the first end is provided with a fourth thread structure 55, and a second end of the rotation shaft 35 rotatably penetrates through the seat 60 and is axially fixed with the seat; the seat 60 is fixedly mounted to the body of the stapler 100.

In order to limit the axial displacement of the rotation shaft 35, the anastomat 100 further comprises a clamp spring 61, a clamping groove 44 is arranged at the second end of the rotation shaft 35, a through hole is arranged on the seat 60, the clamp spring 61 is clamped with the clamping groove 44 after the second end of the rotation shaft 35 rotatably penetrates through the through hole, the outer diameter of the clamp spring 61 is larger than the outer diameter of the rotation shaft 35 and the diameter of the through hole, and the upper end face of the clamp spring 61 abuts against the lower end face of the seat 60 so as to limit the rotation shaft 35 axially. Thereby, the second end of the rotation shaft 35 is axially fixed to the housing 60. The driving assembly 29 further includes a reset member 62, which is used to keep the driving assembly 29 connected to the input member 42 in the first state, where the first end of the reset member 62 is fixed, in this embodiment, the first end of the reset member 62 is fixedly disposed on the seat 60, the second end of the reset member 62 is connected to the driving assembly 29, in order to facilitate installation of the reset member 62, the inner wall of the driving member 33 is provided with a step 39, part of the reset member 62 extends into the step 39, and the second end of the reset member 62 abuts against an end surface of the step 39, so that the space of the driving assembly 29 is fully utilized, and the anastomat 100 is compact. The step 39 is recessed upward from the bottom end of the driving member 33, is formed in a circumferential shape coaxial with the center hole 37, and has a diameter larger than that of the center hole 37. In this embodiment, the restoring member 62 is an elastic member, such as a coil spring.

As shown in fig. 3 and 4, in the present embodiment, the driving member 33 includes a first gear 34 and a second gear 36, the first gear 34 rotates synchronously with the second gear 36, in the first state, the first gear 34 is connected with the transmission assembly, and the second gear 36 is connected with the input member 42; in the second state, the first gear 34 is connected to the transmission assembly and the second gear 36 is disconnected from the input member 42. As can be seen from the above, the transmission assembly includes a transmission member 22 and a cutter assembly 24 coupled to the transmission member 22; in this embodiment, the transmission member 22 is a rack, and the input member 42 is a motor gear. In the first state, the motor gear drives the rack to move through the second gear 36 and the first gear 34, so as to drive the cutter assembly 24 to move; in the second state, the second gear 36 is separated from the motor gear and cannot be driven by the motor 41, but the first gear 34 is still meshed with the rack, and the first gear 34 rotates to drive the rack to retract without overcoming the resistance of the motor 41. At this time, the first operating member 51 is operated to drive the rotation shaft 35 to move the first gear 34 and the second gear 36, thereby driving the rack to retract. That is, the motor 41 drives the cutter assembly 24 to move through the driving assembly 29 under normal conditions, and the first operating member 51 is operated to drive the same driving assembly 29 to retract the cutter assembly 24 under emergency conditions, so that the transmission mechanism of the stapler 100 is simplified, the whole machine volume is reduced, the weight of the whole machine is reduced, and the use of doctors is facilitated.

The retracting mechanism further includes a second operating member 70; the second operating member 70 is detachably connected to the first operating member 51, and the second operating member 70 is configured to drive the first operating member 51 in the same direction to perform the first movement and the second movement, so that the driving member 33 is disengaged from the input member, and after the disengagement, the driving member 33 drives the rack to retract, so as to drive the cutter assembly 24 to retract to the initial position. Thus, the continuity and smoothness of the user operation are ensured. The second operating member 70 is a spare part, and the second operating member 70 is installed only when the motor 41 or the circuit fails and the cutter assembly 24 cannot be driven to retract, i.e. the second operating member 70 is not installed under normal conditions, so that the weight of the whole machine can be reduced, and the manual cutter return triggered by misoperation is avoided. The top of the first operating member 51 is provided with a receiving slot 56, and the second operating member 70 includes an operating end 71 and a driving end 72 extending outwardly from the operating end 71, the driving end 72 being in a form-fit with the receiving slot 56. In this embodiment, the second operating member 70 is an L-shaped rod including a first rod and a second rod angularly connected to the first rod, the operating end 71 being located at an end of the first rod, and the driving end 72 being located at an end of the second rod. And according to the lever principle, the labor-saving arm is larger than the resistance arm, so that the labor can be saved when the second operation piece 70 is used for operation. In other embodiments, the second operating member 70 may be a handwheel. Those skilled in the art will appreciate that the second operating member 70 is not limited to the above-described manner, and is not intended to be limiting.

As shown in fig. 3 and 9 to 11, the following describes the use of the stapler 100.

When stapler 100 is in the first state with normal operation, first gear 34 is engaged with the rack and second gear 36 is engaged with the motor gear. When needed, the motor 41 drives the motor gear to rotate, and the motor gear rotates to drive the second gear 36 and the first gear 34 to rotate, so that the rack is driven to drive the cutter assembly 24 to feed or retract a cutter.

When the stapler 100 fails and a manual retraction is required, a protective cover (not shown) is opened, exposing the first operating member 51. The second operating member 70 is inserted into the receiving groove 56 provided at the top of the first operating member 51, the second operating member 70 is rotated to drive the first operating member 51 to rotate, and the second screw structure 53 of the first operating member 51 is engaged with the first screw structure 52 of the fixing member 50, so that the first operating member 51 moves downward until the second screw structure 53 of the first operating member 51 is disengaged from the first screw structure 52 of the fixing member 50, and the first operating member 51 does not move downward any more. The first operating member 51 moves downwardly to drive the driving member 33 from a first position (shown in fig. 9) engaging the motor gear to a second position (shown in fig. 11) disengaged from the motor gear, while the first gear 34 is still engaged with the rack and the second gear 36 is disengaged from the motor gear. And the third screw thread structure 54 of the first operating member 51 is engaged with the fourth screw thread structure 55 of the rotation shaft 35 in the course that the first operating member 51 is operated to move downward, and when the second screw thread structure 52 of the first operating member 51 is disengaged from the first screw thread structure 51 of the fixing member 50, the third screw thread structure 54 and the fourth screw thread structure 55 are locked so that the first operating member 51 is locked with the rotation shaft 35. When the second operating member 70 is rotated continuously to drive the first operating member 51 to rotate, the first operating member 51 drives the rotating shaft 35 to move, and thus the first gear 34 and the second gear 36 to move, and the first gear 34 drives the rack to retract, and thus the cutter assembly 24 to retract.

In summary, in the present embodiment, on the one hand, the movement of the first operating member 51 is realized by the threaded structure, which is more labor-saving than the direct pressing or cam pressing, so that the use of doctors is facilitated, and the whole structure is simple, safe and reliable; on the other hand, the motor 41 drives the cutter assembly 24 to move through the driving assembly 29 under normal conditions, and in emergency conditions, the first operating member 51 is operated to drive the same driving assembly 29 to retract the cutter assembly 24, so that an additional structure is not needed, the transmission mechanism of the anastomat 100 is simplified, the structural design is reasonable, the whole machine volume is reduced, and the weight of the whole machine is reduced.

It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.

The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.

Claims (12)

1. A surgical instrument comprising a power module, a drive assembly, a transmission assembly, and a retracting mechanism, the drive assembly being coupled to the transmission assembly;

the drive assembly has a first state connected with the electric module and a second state separated from the electric module; in the first state, the electric module drives the transmission assembly to advance or retreat through the driving assembly; the tool retracting mechanism comprises a fixing piece and a first operating piece; the first operating member is operated to perform a first movement to drive the drive assembly to switch from the first state to the second state; the mount includes a first threaded structure, the first operating member includes a second threaded structure, the first threaded structure mates with the second threaded structure to cause the first operating member to perform the first movement in response to being operated; in the second state, the first operating member is operated to perform second movement to drive the driving assembly to move, and further drive the transmission assembly to retreat.

2. The surgical instrument of claim 1, wherein the securing member has a cavity, the first operating member is disposed through the cavity, the first thread structure is disposed on an inner wall of the cavity, and the second thread structure is disposed on an outer wall of the first operating member.

3. The surgical instrument of claim 1, wherein the drive assembly comprises a rotatable shaft and a drive member, the drive member being sleeved on the rotatable shaft, the drive member being coupled to the transmission assembly; in the first state, the driving piece is connected with the electric module; in the second state, the driving member is separated from the electric module; the first operating member is operated to perform a first movement to drive the driving member to move in an axial direction of the rotation shaft to switch the driving member from the first state to the second state; and in the second state, the first operating member is operated to drive the rotating shaft to rotate, so that the driving member is driven to move, and the transmission assembly is driven to retreat.

4. A surgical instrument as recited in claim 3, wherein the first operating member has a first configuration and the rotational shaft has a second configuration; the first and second structures cooperate to lock the first operating member with the rotary shaft in the second state so that the rotary shaft can be driven to rotate by the first operating member.

5. The surgical instrument of claim 4, wherein the first structure is a third thread structure and the second structure is a fourth thread structure, the third thread structure and the fourth thread structure cooperating to lock the first operating member with the rotational shaft.

6. The surgical instrument of claim 5, wherein the first operating member has a first receiving cavity, an inner wall of the first receiving cavity being provided with the third thread formation; the first end of the rotating shaft is arranged in the first accommodating cavity, the first end is provided with the fourth thread structure, the second end of the rotating shaft is rotatably arranged on the seat body of the surgical instrument in a penetrating mode, and the second end is axially fixed with the seat body.

7. A surgical instrument according to claim 3, wherein the first operating member is disposed coaxially with the rotational axis.

8. A surgical instrument as claimed in claim 3, wherein a key is provided on the outside of the rotatable shaft and a keyway is provided on the inside of the driver, the key and keyway cooperating to cause movement of the driver by the rotatable shaft in the second condition.

9. The surgical instrument of claim 8, wherein the key is elongate; the keyway slides along the key as the driver moves axially along the rotational axis.

10. The surgical instrument of claim 1, wherein the retracting mechanism further comprises a second operating member;

the second operating member is detachably connected with the first operating member, and the second operating member drives the first operating member to do the first movement and the second movement in the same direction.

11. The surgical instrument of claim 1, wherein the drive assembly comprises a first gear and a second gear, the first gear being coupled to the transmission assembly and the second gear being coupled to the power module in the first state; in the second state, the first gear is connected with the transmission assembly, and the second gear is separated from the electric module.

12. The surgical instrument of claim 1, wherein the transmission assembly comprises a rack and a cutter assembly coupled to the rack.