CN110604603B

CN110604603B - Driving mechanism and electric anastomat

Info

Publication number: CN110604603B
Application number: CN201810626311.7A
Authority: CN
Inventors: 孙宝峰; 张志星; 李贺英
Original assignee: Jiangsu Fengh Medical Equipment Co Ltd
Current assignee: Jiangsu Fengh Medical Equipment Co Ltd
Priority date: 2018-06-14
Filing date: 2018-06-14
Publication date: 2021-09-07
Anticipated expiration: 2038-06-14
Also published as: CN110604603A

Abstract

The invention discloses a driving mechanism, comprising: the main thread insert is provided with a cavity, a first internal thread and a first external thread, and the first internal thread is arranged on the wall of the cavity; an outer sleeve having a second internal thread; and a screw having a second external thread; wherein, this outer thread bush is located this main screw shell, and this second internal thread and this first external screw thread intermeshing, this screw rod set up in this cavity, and this second external thread and this first internal thread intermeshing. According to the electric anastomat and the driving mechanism used by the electric anastomat, the closing and the opening of the end effector of the electric anastomat and the cutting, sewing and knife returning of the cutting knife are simultaneously realized through one group of driving mechanisms, and compared with the existing anastomat which needs a plurality of groups of different driving mechanisms, the electric anastomat provided by the invention has smaller volume and simpler structure.

Description

Driving mechanism and electric anastomat

Technical Field

The invention relates to a driving mechanism of an electric anastomat and the electric anastomat using the driving mechanism, and belongs to the field of medical instruments.

Background

As one of the surgical medical instruments, the stapler is widely used in open or minimally invasive general surgery, obstetrics and gynecology, urology surgery, thoracic surgery and pediatric surgery as an alternative to the manual suture operation of doctors.

At present, the commonly used anastomat is manually operated in the operation process of closing, inosculating and cutting the physiological tissues, and the manual operation steps are complicated, so that misoperation is easy to occur or operation failure is caused. In addition, due to individual differences, the closing degree and closing time of tissues are easily inconsistent during manual closing operation, and the triggering force is greatly different during triggering operation, so that the operation quality is reduced.

In order to overcome the manual deficiency, the electric anastomat is taken as a new product for replacing the manual anastomat. Then, the disclosed electric stapler often only can realize the automation of part of the operations in the operation processes of closing, stapling, cutting and the like, because the driving mechanism corresponding to the closing operation and the driving mechanism corresponding to the cutting and suturing operation are independent from each other, so the existing improvement is often to perform the automatic cutting and suturing operation by driving the driving mechanism corresponding to the cutting and suturing operation by the driving motor. The driving mechanism corresponding to the cutting and sewing operation generally comprises a motor, a multi-stage gear and a rack, the multi-stage gear is axially mounted in an overlapping mode and electrically connected with the motor, after the motor is started, the multi-stage gear is driven to enable the rack connected with the upper gear to be driven to move linearly, the rack is connected with a mandrel, the linear movement of the rack pushes the mandrel, the mandrel continues to push a cutting knife to enter a nail bin assembly, so that a sewing nail is ejected from the nail bin assembly and is acted by a sewing nail forming piece to form, and then the automatic cutting and sewing operation is completed. The driving mechanism for driving the electric stapler to perform the cutting and suturing operation has a complex overall structure and a large volume, and only can realize a single operation. In particular, the state of the art is less concerned with the automatic closing of the jaws of an electric stapler.

In view of the above, the present invention provides a novel electric stapler, which employs a driving mechanism capable of simultaneously performing electric operation of closing and opening operation and cutting and suturing operation, and the electric closing and opening operation and the electric cutting and suturing operation are sequentially performed.

Disclosure of Invention

In view of the shortcomings of the prior art, the present invention aims to provide a novel electric stapler, which employs a driving mechanism, wherein the driving mechanism can simultaneously realize the electric operation of closing and opening operation and cutting and suturing operation, and the electric closing and opening operation and the electric cutting and suturing operation are sequentially performed. The invention is realized by the following technical scheme:

a drive mechanism, comprising: the main thread insert is provided with a cavity, a first internal thread and a first external thread, and the first internal thread is arranged on the wall of the cavity; an outer sleeve having a second internal thread; and a screw having a second external thread; wherein, this outer thread bush is located this main screw shell, and this second internal thread and this first external screw thread intermeshing, this screw rod set up in this cavity, and this second external thread and this first internal thread intermeshing.

Preferably, the main thread insert has a central axis, and the first length of the first external thread is equal to the second length of the second internal thread along the extension direction of the central axis.

Preferably, the main thread insert is a hollow tube body, the hollow tube body includes the cavity, and the first internal thread is disposed on an inner wall of the hollow tube body, i.e., a wall of the cavity.

Preferably, the first internal thread is disposed on the entire inner wall of the hollow tube, or the first internal thread is disposed on a part of the inner wall of the hollow tube.

Preferably, the hollow tube body has an outer wall, and the first external thread is disposed on the outer wall.

Preferably, a groove is provided on the outer wall of the hollow tube, the groove is adjacent to the first external thread, and the groove is located between the distal end of the hollow tube and the first external thread.

Preferably, the first external thread is disposed proximal to the distal side of the hollow tube relative to the proximal side of the hollow tube.

Preferably, when the driving mechanism is in an initial state, the first external thread and the second internal thread are mutually meshed; when the driving mechanism is in a first working state, the outer thread sleeve moves relative to the main thread sleeve along the central axis of the main thread sleeve towards the far side of the main thread sleeve, the first outer thread and the second inner thread are separated from each other, so that the second inner thread is suspended in the groove and is not contacted with the bottom of the groove; wherein, the groove is not provided with a thread structure.

Preferably, the second internal thread is disposed proximal to the external thread sleeve.

Preferably, the outer sleeve has a recess on an outer surface thereof; when the driving mechanism is assembled in the first shell, the first shell is provided with a boss which is embedded into the concave part, and the boss is matched with the concave part to limit the outer sleeve to rotate around the central shaft of the main threaded sleeve.

Preferably, the screw comprises a screw proximal end, a screw main body and a screw distal end which are connected in sequence, the second external thread is arranged at the screw proximal end, and the screw main body is provided with a smooth outer surface.

Preferably, the radial width of the screw body and the radial width of the screw distal end are respectively smaller than the radial width of the screw proximal end, so that the screw body and the screw distal end are suspended in the chamber.

Preferably, the distal end of the screw comprises an opening and a chute; the stopping part at the near end part of the mandrel is accommodated in the sliding groove; the second groove wall of the sliding groove is adjacent to the opening, and the opening extends through the second groove wall, so that the opening is communicated with the sliding groove.

Preferably, the chute has a first notch, and the first notch is communicated with the chute, so that the chute is an open chute.

Preferably, the opening has a second notch, and the second notch is communicated with the opening, so that the opening is an open opening.

Preferably, the distance between the first groove wall and the second groove wall of the sliding groove is a third length, and the third length is equal to the sum of the first length of the first external thread and the height of the stopping part, and is also equal to the sum of the second length of the second internal thread and the height of the stopping part.

Preferably, when the driving mechanism is in the initial state, the stopping part contacts the second groove wall; when the driving mechanism is in a first working state, the sliding groove slides relative to the stopping part, and the first groove wall contacts the stopping part.

Preferably, the screw further comprises a reset lug disposed at the distal end of the screw.

Preferably, the screw body has a first plane portion and a second plane portion opposite to each other, the main screw sleeve has a central axis, the first plane portion is located above the central axis, and the second plane portion is located below the central axis, wherein the first plane portion and the second plane portion are used for limiting the rotation of the screw around the central axis.

Preferably, the main screw sleeve has a central axis, and the main screw sleeve rotates around the central axis so that the outer screw sleeve and the screw rod respectively perform linear movement along the central axis.

The present invention also provides an electric stapler comprising: a drive mechanism according to any one of the above.

Preferably, the electric stapler of the present invention further includes a driving motor and a first housing, the driving motor is fixed in the first housing, and an output shaft of the driving motor is fixedly connected to the main screw sleeve of the driving mechanism, after the driving motor is started, the main screw sleeve rotates around a central axis of the main screw sleeve, and the outer screw sleeve and the screw rod move linearly along the central axis of the main screw sleeve.

Preferably, the electric anastomat further comprises an elongated shaft and an end effector, wherein the end effector comprises a first jaw and a second jaw which are pivoted with each other; the first jaw is connected to the distal side of the elongated shaft, and the drive mechanism is connected to the proximal side of the elongated shaft; the main screw sleeve rotates along the central axis in a first direction, so that the outer screw sleeve linearly moves along the central axis towards the end effector, and the first jaw is pivoted to be closed on the second jaw; the main screw sleeve rotates around the central axis along a second direction, so that the outer screw sleeve linearly moves along the central axis towards a direction far away from the end effector, and the first jaw pivots to open from the second jaw; the first direction is opposite to the second direction.

Preferably, the powered stapler of the present invention further comprises a push frame, a proximal side of the push frame being connected to a distal side of the drive mechanism, a distal side of the push frame being connected to a proximal side of the elongated shaft.

Preferably, the elongate shaft comprises a cannula, the first jaw being connected to a distal side of the cannula; the near side of the pushing frame is fixedly connected with the far side of the outer sleeve of the driving mechanism, and the far side of the pushing frame is fixedly connected with the near side of the sleeve; the outer sleeve moves linearly along the central axis towards the end effector, so that the pushing frame pushes the sleeve to move towards the end effector, and the sleeve pivots the first jaw to close the first jaw and the second jaw; or the outer sleeve moves linearly along the central axis in the direction away from the end effector, so that the pushing frame drives the sleeve to move linearly in the direction away from the end effector, and the sleeve pivots the first jaw to open the first jaw from the second jaw.

Preferably, the electric stapler of the present invention further comprises an elongated shaft; the slender shaft comprises a mandrel and a cutting knife; the near side of the mandrel is connected with the screw rod far end of the screw rod, and the far side of the mandrel is connected with the cutting knife; the main threaded sleeve rotates around the central axis along a first direction, so that the screw rod moves linearly along the central axis towards the end effector, the screw rod pushes the mandrel to move linearly along the central axis towards the end effector, and the cutting knife is further pushed to enter the end effector to perform cutting and anastomosis operations; the main threaded sleeve rotates around the central axis along a second direction, so that the screw rod linearly moves along the central axis towards the direction far away from the end effector, the screw rod drives the mandrel to linearly move along the central axis towards the direction far away from the end effector, and the cutting knife is withdrawn from the end effector to perform knife returning operation; the first direction is opposite to the second direction.

According to the electric anastomat and the driving mechanism used by the electric anastomat, the closing and the opening of the end effector of the electric anastomat and the cutting, sewing and knife returning of the cutting knife are simultaneously realized through one group of driving mechanisms, and compared with the existing anastomat which needs a plurality of groups of different driving mechanisms, the electric anastomat provided by the invention has smaller volume and simpler structure.

Drawings

FIG. 1 is a schematic sectional view of a partial structure of a motorized stapler according to the present invention;

FIG. 2 is a cross-sectional schematic view of a distal portion of a powered stapler according to the invention;

FIG. 3 is a schematic cross-sectional view of a proximal portion of a motorized stapler according to the invention;

FIG. 4 is a schematic cross-sectional view of the driving mechanism of the powered stapler in an initial state according to the present invention;

FIG. 5 is a schematic cross-sectional view of a screw of the electric stapler according to the present invention;

FIG. 6 is a schematic view showing a partial structure of a screw of the electric stapler according to the present invention;

fig. 7 is a schematic structural view of a push frame of the electric stapler according to the present invention;

FIG. 8 is a schematic view of the structure of the sleeve of the electric stapler according to the present invention;

FIG. 9A is a schematic cross-sectional view of a driving mechanism of the electric stapler according to the present invention in a first working condition;

FIG. 9B is a schematic cross-sectional view of the driving mechanism of the electric stapler according to the present invention in a second working condition;

FIG. 10 is a schematic view of the outer thread of the driving mechanism of the electric stapler according to the present invention;

FIG. 11 is a schematic view of the outer jacket of the driving mechanism of the electric stapler according to another embodiment of the present invention;

fig. 12 is a schematic view of a partial structure of a mandrel of the electric stapler according to the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the description of the present invention, the terms "first", "second", "third", ". Thus, a feature defined as "first," second, "" third, "". In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

FIG. 1 is a schematic sectional view of a partial structure of a motorized stapler according to the present invention; FIG. 2 is a cross-sectional schematic view of a distal portion of a powered stapler according to the invention; fig. 3 is a schematic cross-sectional view of a proximal portion of a motorized stapler according to the invention.

As shown in fig. 1-3, the electric stapler 100 of the present invention includes an operating handle 10, a first housing 20, a second housing 40, an elongated shaft 30, an end effector 50, and a driving mechanism 60. The drive mechanism 60 is received in the receiving space formed by the first housing 20 and the second housing 40, the distal assembly of the drive mechanism 60 is coupled to the proximal side of the elongate shaft 30, and the end effector 50 is coupled to the distal side of the elongate shaft 30. The terms "proximal" and "distal" are defined herein with respect to a clinician manipulating powered stapler 100, with "proximal" referring to the portion closer to the clinician and "distal" referring to the portion further from the clinician.

An operating handle 10 is connected to the first housing 20, and the operating handle 10 includes a firing button 11, and the firing button 11 can control the driving mechanism to operate, so as to implement the closing and opening operations of the first jaw 51 of the end effector 50 of the electric stapler 100 relative to the second jaw 52, and the feeding and retracting operations of the cutting knife 31. The operating handle 10 may be formed by injection molding, and in a preferred embodiment, the operating handle 10 is, for example, a split structure, and along the central axis C of the elongated shaft 30, the operating handle 10 may include left and right handle portions, which may be respectively formed integrally with the first housing 20.

The first housing 20 and the second housing 40 are connected to each other, and the far side of the first housing 20 is received in the accommodating space of the near side of the second housing 40, or the near side section of the second housing 40 covers the far side section of the first housing 20. In this embodiment, in order to improve the assembling convenience of the first casing 20 and the second casing 40, along the central axis C of the elongated shaft 30, the first casing 20 and the second casing 40 respectively include a left casing and a right casing, and the left casing and the right casing can be engaged with each other through a convex pillar and a concave groove, so as to respectively form the first casing 20 and the second casing 40. In this embodiment, the first housing 20 is always stationary; second housing 40 extends a snap 41 toward elongate shaft 30, and snap 41 and the outer surface of elongate shaft 30 are secured to one another, thereby providing a secure connection between second housing 40 and elongate shaft 30. Second housing 40 can be rotated about a central axis C of elongate shaft 30, which rotates elongate shaft 30 and, in turn, end effector 50 distal to elongate shaft 30 about central axis C. That is, second housing 40 is rotatable relative to first housing 20 about a central axis C of elongate shaft 30.

The elongate shaft 30 includes a cutting blade 31, a mandrel 32, a blade holder 33 and a sleeve 34, wherein the proximal side of the cutting blade 31 is connected to the distal side of the mandrel 32, the cutting blade 31 and the mandrel 32 are respectively accommodated in the accommodating cavity 331 of the blade holder 33, and the sleeve 34 is sleeved outside the blade holder 33, or the blade holder 33 is accommodated inside the sleeve 34. The tool holder 33 is a hollow cylinder structure, the sleeve 34 is another hollow cylinder structure, the sleeve 34 is sleeved outside the tool holder 33, and the mandrel 32 and the cutting blade 31, which are connected to each other, are accommodated in the accommodating cavity 331 of the tool holder 33. The proximal section of the elongate shaft 30 is accommodated in the second housing 40, or the distal section of the second housing 40 is combined to the proximal side of the sleeve 34, so that the proximal portion of the sleeve 34 is accommodated in the accommodating space of the second housing 40, wherein the engaging member 41 extending from the second housing 40 is combined to the outer surface of the elongate shaft 30, i.e. the outer surface of the sleeve 34, so that when the second housing 40 rotates around the central axis C of the elongate shaft 30, the second housing 40 drives the elongate shaft 30 to rotate around the central axis C together, so as to change the position of the end effector 50.

An end effector 50 is disposed adjacent the distal sleeve side of the sleeve 34, the end effector 50 including a first jaw 51 and a second jaw 52 pivotally coupled to each other, the second jaw 52 having a cartridge assembly disposed therein, staples exiting the cartridge assembly being formed by the first jaw 51 to staple tissue. The cannula 34 has a cannula distal end movably connected to the first jaw 51. Upon operation of the firing button 11, the drive mechanism acts to push the sleeve 34 in the direction of the central axis C toward the end effector 50, which causes the sleeve of the sleeve 34 to pivot the first jaw 51 distally toward the second jaw 52 to close on the second jaw 52. The connection structure and the actuation manner between the end effector 50 and the sleeve 34 are disclosed in the prior art, and reference may be made to the related description in the prior art. In order to improve the support capability of the tool holder 33 on the mandrel 32, a projection 332 is arranged in the receiving cavity 331 of the tool holder 33, and the projection 332 extends from the inner side of the tool holder 33 towards the mandrel 32, contacts the mandrel 32 and provides a support force for the mandrel 32. When the mandrel 32 slides in the receiving cavity 331, the protrusion 332 can provide a supporting force to prevent the mandrel 32 from shaking.

Compared with the existing electric anastomat, the electric anastomat 100 provided by the invention can realize automatic closing operation, feed cutting and withdrawal operation only through the driving mechanism.

Specifically, fig. 4 is a sectional view schematically showing a driving mechanism of an electric stapler according to the present invention, fig. 5 is a sectional view schematically showing a screw of the electric stapler according to the present invention, and fig. 6 is a partial structure schematically showing the screw of the electric stapler according to the present invention.

As shown in FIGS. 1-6, the driving mechanism 60 includes a main threaded sleeve 61, an outer threaded sleeve 62 and a threaded rod 63, the proximal side of the main threaded sleeve 61 is fixedly connected to a driving motor 80, the driving motor 80 is electrically connected to the firing button 11, and the driving motor 80 can drive the main threaded sleeve 61 to rotate around the central axis C. The main threaded sleeve 61 is a hollow tube body, the hollow tube body includes a cavity 611, the screw 63 is inserted into the cavity 611, a first internal thread 613 is disposed on an inner wall 612 of the hollow tube body, the first internal thread 613 is disposed on the entire inner wall 612 of the hollow tube body, and the inner wall 612 surrounds the cavity 611; the hollow tubular body further comprises an outer wall 614 opposite the inner wall 612, the outer wall 614 is provided with a first external thread 615 and a groove 616, the first external thread 615 and the groove 616 are respectively close to the far side of the hollow tubular body, the first external thread 615 is adjacent to the groove 616, the groove 616 is positioned between the end of the far side of the hollow tubular body and the first external thread 615, the first external thread 615 is only arranged on a part of the outer wall 614, the first external thread 615 has a first length L1, and the second length L2 of the groove 616 of the first length L1 is approximately equal. Wherein the first length L1 extends in a direction parallel to the direction of the central axis C; the second length L2 also extends in a direction parallel to the direction of the central axis C. A bearing 90 is disposed between the main threaded sleeve 61 and the first housing 20 for supporting the first housing 20, and the bearing 90 may be located near a proximal side of the outer threaded sleeve 62. In the present invention, the central axis C of the elongated shaft 30 is coaxial with the central axis of the hollow tube, that is, the central axis C of the elongated shaft is also the central axis of the hollow tube (or the main screw sleeve 61). In this embodiment, the first internal threads 613 are disposed on the entire inner wall 612, but not limited thereto. In other embodiments of the present invention, the first internal thread 613 may also be disposed on the partial inner wall 612, wherein when the first internal thread 613 is disposed on the partial inner wall 612, the length of the first internal thread 613 along the central axis C is equal to or greater than the minimum distance required for the screw 63 to move in the cavity 611 so that the cutting blade 31 can complete the cutting and anastomosis operation, and the minimum distance can be regarded as the sum of the moving distance of the cutting blade 31 from the initial position to the farthest end of the end effector 50 and the first length L1.

The outer sleeve 62 is disposed on the distal side of the main sleeve 61, a second internal thread 621 is disposed on the inner surface of the outer sleeve 62, the second internal thread 621 corresponds to the first external thread 615, when the driving mechanism 60 is in the initial state, the outer sleeve 62 is coupled to the distal side of the main sleeve 61, and the second internal thread 621 and the first external thread 615 are engaged with each other.

Fig. 10 is a schematic view showing the structure of an outer sheath of a driving mechanism of the electric stapler according to the present invention.

As shown in fig. 1, 3 and 10, the outer sleeve 62 is fitted to the first housing 20, a recess 622 is provided on the outer surface of the outer sleeve 62, a boss 21 is provided on the first housing 20 corresponding to the recess 622, the boss 21 falls into the recess 622 after the outer sleeve 62 and the first housing 20 are assembled with each other, the boss 21 is close to a first wall 6221 of the recess 622 in an initial state, and the first wall 6221 is close to the distal side of the outer sleeve 62. When the outer sleeve 62 is moved in the direction of the central axis C, the boss 21 can slide in the recess 622. Wherein the recess 622 has a first width W1, the first width W1 extending in a direction parallel to the central axis C; the boss 21 has a second width W2, the second width W2 extending in a direction parallel to the central axis C. In order that the proximal side of the boss 21 does not protrude from the proximal side of the recess 622 such that the boss 21 is entirely located in the recess 622 thereby ensuring a limited rotational action of the boss 21 on the recess 622, the first width W1 is greater than the sum of the first length L1 of the first external thread 615 and the second width W2 of the boss 21. In this embodiment, the concave portion 622 is formed by, for example, milling the outer surface of the outer sleeve 62, the second wall of the concave portion 622 opposite to the first wall 6221 is removed to form a hollow portion 6222, the hollow portion 6222 is located at the proximal side of the outer sleeve 62, and the hollow portion 6222 makes the concave portion 622 an open type groove, and the open type groove is, for example, a rectangular groove, but not limited thereto.

In the present invention, the boss 21 of the first housing 20 is inserted into the recess 622 of the outer nut 62, after the driving mechanism 60 is started, the main nut 61 rotates around the central axis C, the boss 21 and the recess 622 are matched to restrict and limit the rotation of the outer nut 62 around the central axis C, that is, the boss 21 and the recess 622 are designed to restrict and limit the rotation of the outer nut 62 around the central axis C, thereby ensuring that the outer nut 62 can only move linearly along the central axis C under the action of the main nut 61.

Fig. 11 is a schematic view showing the structure of an outer screw sheath of a driving mechanism of an electric stapler according to another embodiment of the present invention.

As shown in fig. 3 and 11, the outer surface of the outer sleeve 62 'is provided with a recess 622', and the recess 622 'may be a closed groove (relative to the above open groove having a hollow portion) formed by milling the outer surface of the outer sleeve 62', the closed groove having a first width W1 ', and the extending direction of the first width W1' is parallel to the central axis C. After the outer thread 62 ' and the first housing 20 are assembled with each other, the boss 21 falls into the recess 622 ', and in the initial state, the boss 21 is close to the first wall 6221 ' of the recess 622 ', and the first wall 6221 ' is close to the distal side of the outer thread 62. The boss 21 is slidable in the recess 622 'when the outer sleeve 62' is moved along the central axis C. In order that the proximal side of the boss 21 does not abut against the second wall 6223 of the recess 622 ' when sliding, avoiding the limitation of the sliding of the boss 21, the first width W1 ' of the recess 622 ' is greater than the sum of the first length L1 of the first external thread 615 and the second width W2 of the boss 21. In this embodiment, the recess 622 ' includes a second wall 6223 opposite the first wall 6221 ', the first wall 6221 ' being proximal to the distal side of the outer sleeve 62 ' and the second wall 6223 being proximal to the proximal side of the outer sleeve 62 '. The concave portion 622 'and the convex portion 21 cooperate to restrict and limit the rotation of the outer sleeve 62 around the central axis C, that is, the convex portion 21 and the concave portion 622' are designed to restrict and limit the rotation of the outer sleeve 62 'around the central axis C, so as to ensure that the outer sleeve 62' can only move linearly along the central axis C under the action of the main sleeve 61.

With continued reference to fig. 4 and 5, the screw 63 includes a screw proximal end 631, a screw main body 632, and a screw distal end 633, which are connected in sequence, and the screw proximal end 631 and the screw distal end 633 are respectively connected to two opposite ends of the screw main body 632, wherein the screw proximal end 631 is located at a proximal side of the screw 63, and the screw distal end 633 is located at a distal side of the screw 63. The proximal end 631 of the screw has a second external thread 6311, and the second external thread 6311 is engaged with the first internal thread 612, so that the screw 63 is engaged with the main nut 61. The proximal end 631 of the screw is, for example, a cylinder, and the annular outer surface of the cylinder is provided with a second external thread 6311. The connection among the screw proximal end 631, the screw main body 632 and the screw distal end 633 comprises an integral molding or a fixed connection.

The screw body 632 and the screw distal end 633 respectively have smooth outer surfaces, that is, no thread structure is disposed on the screw body 632 and the screw distal end 633, and the radial width of the screw body 632 and the radial width of the screw distal end 633 are respectively smaller than the radial width of the screw proximal end 631, so that the screw body 632 and the screw distal end 633 are suspended in the cavity 611, the outer surfaces of the screw body 632 and the screw distal end 633 are prevented from contacting the first internal thread 612, friction between the screw body 632 and the screw distal end 633 and the main barrel 61 can be reduced, and the screw 63 can move linearly in the inner cavity 611 of the main barrel 61.

In this embodiment, when the driving mechanism 60 is in an operating state, the driving motor 80 drives the main screw sleeve 61 to rotate around the central axis C, the main screw sleeve 61 is fixedly connected with the driving motor 80, the bearing 90 is arranged between the main screw sleeve 61 and the first housing 20, and the driving motor 80 is fixed in the first housing 20, so that the main screw sleeve 61 performs a rotational motion around the central axis C after the driving motor 80 is started. When the main screw sleeve 61 performs a rotational movement, due to the mutual engagement between the first internal thread 612 of the main screw sleeve 61 and the second external thread 6311 on the screw proximal end 631 of the screw 63, the screw proximal end 631 is screwed forward or backward along the central axis C in the chamber 611 toward the distal side of the main screw sleeve 61 or toward the proximal side of the main screw sleeve 61 by the constraint of the pushing frame 70 on the screw distal end 633 (the constraint of the pushing frame 70 on the screw distal end 633 will be further described below), that is, the screw 63 can be screwed forward or backward in the chamber 611 along the direction of the central axis C under the action of the main screw sleeve 61; in the process of screwing in or screwing out the screw 63, the screw 63 always moves linearly.

As shown in fig. 4 to 6 and 12, the screw distal end 633 includes an opening 635 and a sliding groove 634, the opening 635 and the sliding groove 634 are communicated with each other, the mandrel 32 includes a proximal end 321 (shown in fig. 12) and a stopper 322 (shown in fig. 12), the proximal end 321 and the stopper 322 can be received in the sliding groove 634 across the opening 635, the opening 635 has a first width S1, the sliding groove 634 has a second width S2, an extending direction of the first width S1 is perpendicular to a direction of the central axis C, and an extending direction of the second width S2 is perpendicular to the direction of the central axis C; the first width S1 is smaller than the second width S2, so that the opening 635 and the sliding groove 634 form a narrow front and wide rear channel. Wherein, the stopping portion 322 is disposed on the proximal end portion 321, the stopping portion 322 has a third width S3, the extending direction of the third width S3 is perpendicular to the direction of the central axis C, the third width S3 is greater than the first width S1 and smaller than the second width S2, the opening 635 has a first width S1 greater than the outer dimension of the proximal end portion 321, therefore, when the proximal side of the mandrel 32 is combined with the distal end 633 of the screw, the stopping portion 322 is located in the sliding groove 634, and since the third width S3 of the stopping portion 322 is greater than the first width S1 of the opening 635 and smaller than the second width S2 of the sliding groove 634, the stopping portion 322 on the proximal end portion 321 of the mandrel 32 cannot be separated from the sliding groove 634, thereby enabling the mandrel 32 to be reliably connected with the distal end 633 of the screw, and when the stopping portion 322 is located in the sliding groove 634, when the driving mechanism 60 is in the initial state, the stopping portion 322 is located at a distance from the first groove wall 6342 of the sliding groove 634, the distance is set such that the sliding groove 634 can slide relative to the stopping portion 322 when the driving mechanism 60 is switched from the initial state to the first working state. The proximal end 321 of the core shaft 32 is the end of the core shaft 32 close to the doctor.

With continued reference to fig. 4-6, in the present embodiment, the mandrel 32 is substantially cylindrical in configuration, and the opening 635 at the distal end 633 of the screw is circular; the shape of the stopping portion 322 on the proximal end 321 of the core shaft 33 is matched with the sliding groove 634 on the screw distal end 633 of the screw 63, including but not limited to, the stopping portion 322 is a cylindrical stopping block, and the sliding groove 634 is a cylindrical sliding groove; alternatively, the stopping portion 322 is a rectangular parallelepiped stopping block, and the sliding groove 634 is a rectangular parallelepiped sliding groove. In order to facilitate the assembly of the mandrel 32 and the screw distal end 633, the screw distal end 633 further includes a first notch 6341 and a second notch 6351, and the first notch 6341 and the sliding groove 634 are communicated with each other, so that the sliding groove 634 is an open sliding groove; the second gap 6351 is in communication with the opening 635, such that the opening 635 is an open opening. The proximal end 321 of the mandrel 32 enters the sliding groove 634 through the first notch 6341, enters the opening 635 through the second notch 6351, and the stopper 322 enters the sliding groove 634 through the first notch 6341. The first notch 6341 has a fourth width S4, the extending direction of the fourth width S4 is perpendicular to the direction of the central axis C, and the fourth width S4 is slightly larger than the third width S3. In addition, the screw distal end 633 is further provided with a reset bump 636, and the reset bump 636 acts on the pushing frame 70.

As shown in fig. 5, the chute 634 has a first and a second

opposing slot wall

6342, 6343, the second slot wall 6343 is adjacent to the opening 635, the opening 635 extends through the second slot wall 6343 such that the opening 635 and the chute 634 are in communication, wherein the stop portion 322 on the proximal end 321 of the spindle 32 is located distal to the chute 634 when the driving mechanism 60 is in the initial state shown in fig. 4, i.e., the stop portion 322 is now adjacent to the second slot wall 6343. In this embodiment, the distance between the first groove wall 6342 and the second groove wall 6343 of the sliding groove 634 is a third length L3, and the third length L3 is equal to the sum of the first length L1 and the height of the stopping portion 322, i.e., when the driving mechanism 60 is in the initial state shown in fig. 4, the distance between the proximal surface of the stopping portion 322 and the first groove wall 6342 is the "idle stroke" of the sliding groove 634. The height of the stopper portion 322 refers to its dimension in the direction of the central axis C. When the driving mechanism 60 enters the first working state shown in fig. 9A from the initial state, the outer sleeve 62 moves relative to the main sleeve 61 by a distance equal to the distance the screw 63 moves in the cavity 611 of the main sleeve 61 in the direction of the central axis C, and the distances are equal to the first length L1 and the third length L3 minus the height of the stopper 322. When the driving mechanism 60 is switched from the initial state to the first working state, the screw 63 moves linearly in the cavity 611 along the central axis C, and the sliding groove 634 moves relative to the stopping portion 322, that is, the first groove wall 6342 of the sliding groove 634 gradually approaches the stopping portion 322 and abuts against the stopping portion 322, at this time, the stopping portion 322 is not displaced by the first groove wall 6342 (or the screw 63), that is, the mandrel 32 is in an unfired state.

Fig. 7A and 7B are schematic structural views of a pushing frame of the electric stapler according to the present invention.

As shown in fig. 4 and fig. 6 to 7B, a pushing frame 70 is disposed at the distal side of the driving mechanism 60 of the electric stapler 100 according to the present invention, the distal side of the pushing frame 70 is coupled to the sleeve 34 of the elongated shaft 30, and the proximal side of the pushing frame 70 is coupled to the screw distal end 633 of the screw 63. In order to improve the assembly convenience of the pushing frame 70, the pushing frame 70 is a split structure, and includes a first pushing frame 70a and a second pushing frame 70b, and the first pushing frame 70a and the second pushing frame 70b have the same structure.

As shown in fig. 7A and 7B, the first pushing frame 70a has a first edge 751 and a second edge 761, the first edge 751 is parallel to and opposite to the second edge 761, two opposite ends of the first edge 751 are respectively connected to the first end of the first sidewall 711 and the second end of the second sidewall 721, two opposite ends of the second edge 761 are respectively connected to the third end of the first sidewall 711 and the fourth end of the second sidewall 721, wherein the first end is opposite to the third end, and the second end is opposite to the fourth end. The first edge 751 is provided with a first engaging post 75, and the second edge 761 is provided with a first engaging hole 76. Similarly, the second engaging post 78 is provided on the first side portion 751, the second engaging hole 77 is provided on the second side portion 761 of the second push frame 70b, and when the second push frame 70b is rotated 180 degrees around the central axis C, the second engaging hole 77 corresponds to the first engaging post 75, and the second engaging post 78 corresponds to the first engaging hole 76. The first engaging post 75 is engaged with the second engaging hole 77, and the second engaging post 78 is engaged with the first engaging hole 76, so that the first pushing frame 70a and the second pushing frame 70b are combined to form the pushing frame 70. The connection comprises fixed connection and integral forming.

As shown in fig. 7A and 8, the first pushing frame 70a includes a first side wall 711 and a second side wall 721, the first side wall 711 is located on the far side of the first pushing frame 70a, the second side wall 721 is located on the near side of the first pushing frame 70a, and the first side wall 711 is parallel to and opposite to the second side wall 721. The first side wall 711 is provided with a first combining portion 71, and when the distal side of the pushing frame 70 is connected to the sleeve 34, the first combining portion 71 is combined in the recessed structure 341 of the sleeve 34, and the recessed structure 341 is located at the proximal side of the sleeve 34. As can be seen from fig. 2, the second side wall 721 is provided with a second combining portion 72, the screw distal end 633 enters the interior of the first pushing frame 70a (or the interior of the pushing frame 70) from the second combining portion 72, and the second combining portion 72 is combined with the screw main body 632, preferably, the second combining portion 72 is combined with the screw main body 632 at a position adjacent to the screw distal end 633. Wherein the screw distal end 633 passes the second joint 72 and enters the interior of the first pushing frame 70a, and the reset bump 636 (shown in fig. 6) on the screw distal end 633 abuts against the inner side 7211 of the second side wall 721; alternatively, the screw distal end 633 enters the interior of the pushing frame 70 formed by the first pushing frame 70a and the second pushing frame 70b, and the reset protrusion 636 (shown in fig. 6) on the screw distal end 633 abuts against the inner side 7211 of the second side wall 721 of the first pushing frame 70a and the second pushing frame 70b at the same time.

In addition, the present invention restricts the screw 63 from rotating around the central axis C by the cooperation between the pushing frame 70 and the screw distal end 633, and to achieve this purpose, the second combining portion 72 on the second side wall 721 includes an arc-shaped bottom 724, a first limiting plane 722 and a second limiting plane 723, and the first limiting plane 722 and the second limiting plane 723 are respectively disposed at two opposite ends of the arc-shaped bottom 724, so that the arc-shaped bottom 724, the first limiting plane 722 and the second limiting plane 723 form a U-shaped structure, that is, the second combining portion 72 is U-shaped. When the second coupling portion 72 is coupled to the screw distal end 633, the first limiting plane 722 is located above the central axis C, the second limiting plane 723 is located below the central axis C, and the screw body 632 is located between the first limiting plane 722 and the second limiting plane 723. In addition, the first pushing frame 70a further includes a third sidewall 731, the third sidewall 731 is located between the first sidewall 711 and the second sidewall 721, and the third sidewall 731 is disposed adjacent to the first sidewall 711, the third sidewall 731 has a third combining portion 73, a receiving portion 74 is located between the third sidewall 731 and the first sidewall 711, the receiving portion 74 corresponds to the proximal end section 342 of the sleeve 34 (as shown in fig. 8), and the end section 342 is located between the recessed structure 341 and the proximal end 343 of the sleeve 34. The third engaging portion 73 is configured to receive the blade holder 33, and the blade holder 33 is slidable in the third engaging portion 73. In this embodiment, the second pushing frame 70B shown in fig. 7B has the same structure as the first pushing frame 70a shown in fig. 7A, and elements having the same reference numerals in fig. 7B have the same functions as those in fig. 7A, and are not repeated herein.

With continued reference to fig. 7A to 8, when the push frame 70 (shown in fig. 2) is assembled with the sleeve 34, first, the first push frame 70a is assembled to one side of the sleeve 34, the first combining portion 71 of the first push frame 70a is combined with the partially recessed structure 341, the end section 342 partially enters the accommodating portion 74, and the partially proximal end 343 abuts against the first surface 732 of the third side wall 731; continuing, the second push frame 70b is assembled to the opposite side of the sleeve 34, the first combining portion 71 of the second push frame 70b is combined with the partial concave structure 341, the end section 342 enters the accommodating portion 74 of the second push frame 70b partially, and the proximal end 343 of the rest portion abuts against the first surface 732 of the third side wall 731 of the second push frame 70 b. The first engaging post 75 of the first pushing frame 70a enters the second engaging hole 77 of the second pushing frame 70b, the first engaging hole 76 of the first pushing frame 70a is combined with the second engaging post 78 of the second pushing frame 70b, that is, the second pushing frame 70b and the first pushing frame 70a form the pushing frame 70, and the pushing frame 70 is assembled to the sleeve 34.

As shown in fig. 2-4 and 6, the distal side of the pushing frame 70 is assembled to the sleeve 34, and the proximal side of the pushing frame 70 is assembled to the screw body 632 adjacent to the distal end 633 of the screw. The second combining portion 72 of the first pushing frame 70a and the second combining portion 72 of the second pushing frame 70b form an annular hole, the screw distal end 633 passes through the annular hole and enters the inside of the first pushing frame 70a and the second pushing frame 70b (or the inside of the pushing frame 70), and the reset bump 636 on the screw distal end 633 abuts against the inner side 7211 of the second side wall 721. In order to restrict and limit the rotation of the screw 63 in the process of screwing in or screwing out the cavity 611 of the main screw sleeve 61, the screw body 632 is provided with a first flat part 6321 and a second flat part 6322 which are opposite, the first flat part 6321 and the second flat part 6322 are distributed above and below the central axis C, wherein the first flat part 6321 is in contact with the first limit plane 722 on the second combining part 72, and the second flat part 6322 is in contact with the second limit plane 723 on the second combining part 72. When the screw 63 is screwed in or out of the cavity 611, the screw 63 can only move linearly along the central axis C and cannot rotate around the central axis C due to the mutual restriction between the first plane 6321 and the first limit plane 722 and between the second plane 6322 and the second limit plane 723.

In order to more accurately understand the driving process of the driving mechanism of the present invention, the initial state, the first operating state, and the second operating state of the driving mechanism 60 will be described in detail with reference to fig. 2, 4, 9A, and 9B.

FIG. 9A is a schematic cross-sectional view of a driving mechanism of the electric stapler according to the present invention in a first working condition; fig. 9B is a schematic cross-sectional view of the driving mechanism of the electric stapler according to the present invention in a second working condition.

As shown in fig. 2 and 4, the main screw sleeve 61 is fixedly connected to the driving motor 80, and the driving motor 80 is fixed in the first housing 20. When the driving mechanism 60 is in the initial state, the outer thread sleeve 62 is coupled to the distal side of the main thread sleeve 61, the second internal thread 621 of the outer thread sleeve 62 is engaged with the first external thread 615 of the main thread sleeve 63, and the boss 21 of the first housing 20 is fitted into the recess 622 of the outer thread sleeve 62; the screw 63 is positioned in the cavity 611 of the main nut 61, and the second external threads 6311 on the proximal end 631 of the screw engage the first internal threads 612 of the main nut 61; preferably, screw proximal end 631 is engaged to the proximal side of chamber 611 near operating handle 10 (shown in FIG. 1); the distal end 633 of the screw is connected to the proximal end 321 of the spindle 32, the stop portion 322 on the proximal end 321 of the spindle 32 is received in the sliding groove 634 of the distal end 633 of the screw, and the stop portion 322 is close to the second groove wall 6343 of the sliding groove 634 (as shown in fig. 5); the distal side of push frame 70 is connected to the proximal side of sleeve 34, and the proximal side of push frame 70 is connected to the distal side of screw body 632; the pushing frame 70 is fixedly connected with the outer sleeve 62, and the pushing frame and the outer sleeve can be fixedly connected through screw locking or welding.

When the driving mechanism 60 is in the first working state, the electric stapler 100 correspondingly performs the operation that the pushing frame 70 pushes the sleeve 34 to move toward the end effector 50 along the central axis C, so as to drive the first jaw 51 of the end effector 50 to pivot relative to the second jaw 52, so that the first jaw 51 is closed on the second jaw 52; that is, when the electric stapler 100 is in the first working state, the end effector 50 performs the closing operation. Wherein, after the end effector 50 performs the closing operation, the driving motor 80 automatically stops working, and when the driving mechanism 60 needs to enter the second working state from the first working state, the firing button 11 of the operating handle 10 needs to be fired again to restart the driving motor 80. When the driving mechanism 60 is in the second working state, the electric stapler 100 correspondingly performs the operation that the screw 63 pushes the mandrel 32 to move along the central axis C toward the end effector 50, and the mandrel 32 pushes the cutting knife 31 to enter the cartridge assembly of the end effector 50, so as to perform the cutting and stapling operation; that is, when the electric stapler 100 is in the second working state, the cutting and stapling operation is performed.

Wherein, the driving motor is in a first working state, the firing button 11 in the firing operation handle 10 and electrically connected to the driving motor 80 is started, so that the main threaded sleeve 61 rotates around the central axis C along a first direction, since the driving motor 80 is fixed in the second housing 20 and the main threaded sleeve 61 is fixedly connected with the driving motor 80, a bearing 90 is arranged between the main threaded sleeve 61 and the second housing 20, so that the main threaded sleeve 61 only rotates around the central axis C along the first direction; the main nut 61 rotates in a first direction around the central axis C, and the outer nut 62 and the screw 63 are simultaneously driven and move toward the end effector 50 along the direction of the central axis C by the restriction of the first housing 20 to the rotation of the outer nut 62 and the restriction of the push bracket 70 to the rotation of the screw body 632.

For the purpose of clearly illustrating the moving processes of the outer screw 62 and the screw 63 in the driving mechanism 60, the present invention will be described below with reference to the accompanying drawings, wherein the outer screw 62 and the screw 63 move separately, but it should be understood that in the first operating state, the outer screw 62 and the screw 63 move simultaneously.

As shown in FIGS. 4 and 9A, the firing button 11, such as by pulling the firing button 11 toward the operating handle 10, rotates the main nut 61 in a first direction about the central axis C for the outer nut 62, rotates the first external thread 615 on the outer wall 614 of the main nut 61 in the first direction about the central axis C, and restricts and limits the rotation of the outer nut 62 about the central axis C by the engagement of the recess 622 on the outer surface of the outer nut 62 with the boss 21 of the first housing 20, such that the second internal thread 621 engaged with the first external thread 615 moves linearly, and such that the outer nut 62 moves linearly relative to the main nut 61 along the central axis C toward the end effector 50, until the first external thread 615 and the second internal thread 621 move linearly from the engaged state shown in FIG. 4 to the disengaged state shown in FIG. 9A. At this time, the second internal thread 621 enters the recess 616, the second internal thread 621 hangs up in the recess 616, and the second internal thread 621 does not contact with the bottom of the recess 616. The recess 616 is not provided with a thread structure, and the outer sleeve 62 stops moving linearly along the center axis C due to the lack of the thread structure engaged with the second internal thread 621 and the transition of the first external thread 615 and the second internal thread 621 from the engaged state to the disengaged state. During the above-mentioned movement of the outer sleeve 62, the outer sleeve 62 pushes the push frame 70 fixedly connected thereto to move linearly along the central axis C toward the end effector 50, the first engaging portion 71 inside the push frame 70 acts on the recessed structure 341 of the sleeve 34, and the first surface 732 of the third side wall 731 acts on the proximal end 343 of the sleeve 34, so that the push frame 70 can push the sleeve 34 to move along the central axis C toward the end effector 50, the end of the sleeve 34 at the far side pushes against the first jaw 51 of the end effector 50, so that the first jaw 51 pivots relative to the second jaw 52, and the first jaw 51 is closed on the second jaw 52. In this embodiment, when the outer sheath 62 moves from the first position P1 to the second position P2, the sleeve 34 is pushed by the pushing frame 70 fixedly connected thereto so that the end effector 50 performs a closing operation, and the first position P1 is defined as a position where the outer sheath 62 is located when the first external thread 615 is fully engaged with the second internal thread 621; the second position P2 is defined as the position of the outer sleeve 62 when the second internal thread 621 is completely dropped into the recess 616, i.e. the first external thread 615 is separated from the second internal thread 621.

With continued reference to fig. 4 and 9A, for the screw 63, during the process that the main screw 61 rotates in the first direction to drive the outer screw 62 to move from the first position P1 to the second position P2, the screw 63 disposed in the cavity 611 of the main screw 61 simultaneously moves from the third position P3 to the fourth position P4, which defines the third position P3 as the position of the screw proximal end 631 of the screw 63 in the initial state of the driving mechanism 60; the fourth position P4 is defined as the position of the proximal end 631 of the screw 63 when the driving mechanism 60 is in the first working state. In detail, the first internal thread 613 on the inner wall 612 of the main screw sleeve 61 rotates in the first direction, and the rotation of the screw 63 around the central axis C is restricted and limited by the first and second limit planes 722 and 723 of the second coupling portion 72 of the push bracket 70 and the first and

second plane portions

6321 and 6322 of the screw body 632, respectively, so that the screw proximal end 631 of the screw 63 having the second external thread 6311 engaged with the first internal thread 613 moves linearly along the central axis C toward the end effector 50, that is, the screw 63 moves linearly along the central axis C toward the end effector relative to the main screw sleeve 61. In this embodiment, in the first working state of the driving mechanism 60, the screw proximal end 631 is located in the cavity 611 of the main nut 61, and the screw proximal end 631 moves from the third position P3 to the fourth position P4, wherein the distance that the screw proximal end 631 moves from the third position P3 to the fourth position P4 relative to the main nut 61 is equal to the distance that the outer nut 62 moves from the first position P1 to the second position P2 relative to the main nut 61. This is because the pitches of the first internal thread 612, the first external thread 615, the second internal thread 621, and the second external thread 6311 are the same.

It should be noted that, after the screw proximal end 631 moves from the third position P3 to the fourth position P4, the corresponding screw distal end 633 also moves by the same distance, at this time, the first groove wall 6342 (as shown in fig. 5) of the sliding groove 634 of the screw distal end 633 abuts against the stop portion 322 on the spindle distal end 321 of the spindle 32, and the stop portion 322 is not displaced by the first groove wall 6342, and the spindle 32 is not fired when the driving mechanism 60 is in the first working state. In the first operating state, the sliding stroke of the sliding groove 634 relative to the stopper 322 may be regarded as an "idle stroke", that is, after the driving mechanism 60 enters the first operating state from the initial state, the screw 63 is driven by the main screw 61 to move linearly along the central axis C toward the end effector 50, and in the process of this linear movement, only the screw 63 itself moves, and the screw 63 does not displace the spindle 32, so the process of the above movement of the screw 63 is referred to as an "idle stroke" of the screw 63.

In addition, the electric stapler 100 of the present invention further includes a conversion stopper (not shown). The conversion limiter is electrically connected to the driving motor 80, and meanwhile, the conversion limiter is electrically connected to the trigger button 11 or a conversion button (not shown), and the conversion limiter can be triggered by the trigger button 11 or the conversion button. The switching limiter is used for controlling the driving motor 80 to rotate reversely, so that the main thread insert 61 rotates around the central axis C along a second direction, and the second direction is opposite to the first direction.

Specifically, before the electric stapler 100 of the present invention enters into the cutting operation, if the operator needs to open the first jaw 51 and the second jaw 52 which are closed to each other, the firing button 11 is pushed in the opposite direction, for example, toward the end effector 50 to trigger the switching limiter, the switching limiter controls the driving motor 80 to rotate in the opposite direction, the main screw sleeve 61 rotates in the second direction around the central axis C, unlike the first working state in which the outer screw sleeve 62 and the screw 63 are simultaneously driven to move linearly along the central axis C, at this time, since the second outer thread 6311 of the screw proximal end 631 and the first inner thread 613 of the main screw sleeve 61 are engaged with each other, the screw proximal end 631 is first driven to move linearly from the fourth position P4 toward the third position P3 by the main screw sleeve 61 rotating in the second direction, or the screw 63 is first driven to move linearly along the central axis C toward the operating handle 10 by the main screw sleeve 61 rotating in the second direction Moving; while the outer sleeve 62 is in the second position P2, the second internal thread 621 of the outer sleeve 62 is disengaged from and does not engage the first external thread 615 of the main sleeve 61, and therefore, the outer sleeve 62 cannot be driven from the second position P2 toward the first position P1 by the main sleeve 61 rotating in the second direction. In this embodiment, the rotation of the screw 63 around the central axis C is also restricted by the first and second limit planes 722 and 723 of the second coupling portion 72 of the pushing frame 70 respectively cooperating with the first and

second plane portions

6321 and 6322 of the screw body 632.

As can be seen from fig. 4 and fig. 9A, in the driving mechanism 60 of the present invention, the screw distal end 633 of the screw 63 is provided with the reset protrusion 636, and when the driving mechanism 60 is in the initial state and the first working state, the reset protrusion 636 always abuts against the inner side 7211 of the second side wall 721 of the pushing frame 70. To allow the outer sleeve 62 to return from the second position P2 to the first position P1, the screw distal end 633 moves in response to the movement of the screw proximal end 631, at which time the return projection 636 pushes against the inner side 7211 of the second side wall 721 of the push bracket 70, causing the push bracket 70 to move in the direction of the operating handle 10 (as shown in fig. 1), the push bracket 70 further pushes the outer sleeve 62 fixedly connected thereto to move, and the outer sleeve 62 is pushed such that the second internal thread 621 re-engages with the first external thread 615 on the main sleeve 61. After the second internal thread 621 is re-engaged with the first external thread 615 of the main nut 61, the outer nut 62 is driven by the main nut 61 to move linearly along the central axis C from the second position P2 toward the first position P1, i.e., the outer nut 62 is driven to move from the second position P2 toward the first position P1 by rotating the main nut 61 in the second direction, and the pushing frame 70 moves together with the outer nut 62 toward the operating handle 10 (shown in fig. 1), at this time, the pushing frame 70 moves the sleeve 34 toward the operating handle 10 (shown in fig. 1), so that the sleeve 34 pivots the first jaw 51 to open, and the first jaw 51 retracts back to the initial position and is completely separated from the second jaw 52. The first jaw 51 is in an initial position, i.e. the first jaw 51 is completely separated from the second jaw 52. The pivotal connection between the first jaw 51 and the second jaw 52 is the same as the connection between the jaw assemblies in the anastomat already disclosed, and reference may be made to the description of the related art, which is not repeated herein. In this embodiment, rotation of the outer sleeve 62 about the central axis C is also restricted by the cooperation of the boss 21 on the first housing 20 and the recess 622 on the outer surface of the outer sleeve 62.

When the first jaw 51 and the second jaw 52 are completely separated, the driving motor 80 is turned off to stop the operation, and the driving mechanism 60 stops the driving.

As can be seen from the above description, the present invention provides a powered stapler 100 having a driving mechanism 60, wherein, on one hand, the main screw 61 rotates in a first direction around the central axis C to drive the outer screw 62 to linearly move along the central axis C toward the end effector 50 so as to pivot the first jaw 51 of the end effector 50 toward the second jaw 52 for closing on the second jaw 52, wherein the operation of pivoting the first jaw 51 toward the second jaw 52 for closing on the second jaw 52 is accompanied by the linear movement of the screw 63 along the central axis C toward the end effector 50 for "idle stroke"; on the other hand, the main screw 61 is rotated about the central axis C in a second direction opposite to the first direction, by first driving the screw 63 in the chamber 611 of the main screw 61 to move linearly along the central axis C toward the operating handle 10, the screw distal end 633 indirectly causes the outer screw 62 to re-engage with the main screw 61, the outer screw 62 is driven by the main screw 61 to move linearly toward the operating handle 10, and the pushing frame 70 and the sleeve 34 are driven to move linearly toward the operating handle 10, so that the first jaw 51 pivots relative to the second jaw 52 to separate from the second jaw 52. That is, the driving mechanism 60 of the electric stapler 100 according to the present invention is rotated in the first and second opposite directions by the main screw 61, respectively, to perform the closing and opening operations of the first jaw 51 of the end effector 50 with respect to the second jaw 52.

Further, the driving mechanism 60 of the electric stapler 100 provided by the present invention further includes a screw 63 driven by the main screw 61 to move linearly to perform a cutting and stapling operation.

Fig. 9B is a schematic cross-sectional view of the driving mechanism of the electric stapler according to the present invention in a second working condition.

Referring to fig. 9A and 9B, in the first operating state, after the driving mechanism 60 completes the closing operation of the end effector 50, the driving motor 80 is in the off state, and the driving motor 80 needs to be started again by re-firing the firing button 11 of the operating handle 10, for example, by pulling the firing button 11 toward the operating handle 10. The drive motor 80 is activated such that the main nut 61 continues to rotate in the first direction about the central axis C, the outer nut 62 is in the second position P2, i.e. the second internal thread 621 of the outer nut 62 is disengaged from the first external thread 615 of the main nut 61 and is no longer engaged with each other, and the main nut 61 cannot drive the outer nut 62 to move linearly, i.e. in the second operating state, the outer nut 62 is relatively stationary and does not displace. Since the first internal thread 613 is provided throughout the inner wall 612 of the main nut 61, the second external thread 6311 of the screw proximal end 631 and the first internal thread 613 of the main nut 61 are always engaged with each other, that is, the screw proximal end 631 of the screw 63 and the main nut 61 are engaged with each other. In the second working state, the main screw sleeve 61 rotates, and the first and second limiting

planes

722 and 723 of the second combining part 72 of the pushing frame 70 are matched with the first and

second plane parts

6321 and 6322 on the screw body 632 to restrict or limit the rotation of the screw 63 around the central axis C, so that the screw 63 can continue to move linearly along the central axis C in the direction of the end effector 50. Wherein the screw 63 moves linearly along the central axis C toward the end effector 50, the first groove wall 6342 of the sliding groove 634 at the distal end 633 of the screw pushes against the stopping portion 322 of the mandrel 32, so that the mandrel 32 moves linearly along the central axis C toward the end effector 50, the mandrel 32 pushes the cutting knife 31 (shown in fig. 1) disposed at the distal side thereof and fixedly connected thereto into the end effector 50 to cut tissue, and simultaneously the cutting knife 31 drives the staple pushing plate of the cartridge assembly in the second jaw 52, the staple pushing plate pushes staples to be ejected from the cartridge assembly, and the staples are formed by the first jaw 51 to staple the cut tissue. The cutting blade 31 is advanced into the end effector 50, pushed out of the staples and formed into the staples are known in the art, and reference is made to the related description in the prior art, which is not further described herein. In this embodiment, the position of the screw proximal end 631 after the cutting blade 31 has performed the cutting operation is defined as a fifth position P5.

When the cutting operation of the cutting knife is to be performed after the tissue cutting is completed, the switching stopper may be triggered, for example, by a cutting-back button (not shown) disposed on the first housing 20, the switching stopper controls the driving motor 80 to rotate in a second direction, which is opposite to the first direction, and further the main screw sleeve 61 rotates in the second direction, the second external thread 6311 of the proximal end 631 of the screw rod is engaged with the first internal thread 613 of the main screw sleeve 61, so that the main screw sleeve 61 can drive the screw rod 63 to move linearly along the central axis C toward the operating handle 10, the sliding groove 634 of the distal end 633 of the screw rod first moves toward the operating handle 10 until the second groove wall 6343 of the sliding groove 634 contacts the stopping portion 322 of the mandrel 32 during the linear movement of the screw rod 63 toward the operating handle 10, at this time, the screw rod 63 continues to move linearly toward the operating handle 10 under the action of the main screw sleeve 61, the second slot wall 6343 of the sliding slot 634 at the distal end 633 of the screw pushes against the stop 322 (as shown in fig. 4), so that the mandrel 32 moves linearly toward the operating handle 10, the mandrel 32 drives the cutting blade 31 to move toward the operating handle 10 and exit the end effector 50 until the screw 63 returns to the third position P3 shown in fig. 4, the driving motor 80 stops, the main screw sleeve 61 stops rotating, and the screw 63 stops moving.

It should be noted that the knife retracting operation is also accompanied by the operation of the first jaw 51 and the second jaw 52 of the end effector 50 returning from closed to open, and the operation of opening the first jaw 51 relative to the second jaw 52 can be referred to the above description. Briefly, along the central axis C, the screw 63 is linearly moved toward the operating handle 10 until the reset protrusion 636 at the screw distal end 633 contacts the inner side 7211 of the second side wall 721 of the push frame 70, and as the screw 63 continues to move toward the operating handle 10, the reset protrusion 636 pushes the push frame 70, and the push frame 70 simultaneously acts on the sleeve 34 and the outer sleeve 62, such that the second internal thread 621 of the outer sleeve 62 is re-engaged with the first external thread 615 of the main sleeve 61, and the main sleeve 61 drives the screw 63 and the outer sleeve 62 to linearly move toward the operating handle 10, such that the distal end of the sleeve 34 drives the proximal end of the first jaw 51 to pivot the first jaw 51, thereby separating the first jaw 51 from the second jaw 52.

In summary, the driving mechanism of the present invention includes a main threaded sleeve, an outer threaded sleeve and a screw rod, the main threaded sleeve is fixedly connected to a driving motor, the driving motor drives the main threaded sleeve to rotate around a central axis, and the outer threaded sleeve sleeved outside the main threaded sleeve is driven to move linearly along the central axis, so that a first jaw of an end effector of an electric stapler is closed or opened relative to a second jaw; and the driving motor drives the main threaded sleeve to rotate around the central axis, and drives a screw rod arranged in a cavity of the main threaded sleeve to linearly move along the central axis so that a cutting knife of the electric anastomat realizes the operation of feeding, cutting, suturing or back-cutting. The electric anastomat comprises a cutting knife, a driving mechanism, a cutting knife driving mechanism and a cutting knife driving mechanism.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A drive mechanism characterized by: the drive mechanism includes:

the main thread insert is provided with a cavity, a first internal thread and a first external thread, and the first internal thread is arranged on the wall of the cavity;

an outer sleeve having a second internal thread; and

a screw having a second external thread;

the outer sleeve is sleeved on the main sleeve, the second internal thread is meshed with the first external thread, the screw is arranged in the cavity, and the second external thread is meshed with the first internal thread;

the main threaded sleeve is a hollow pipe body, the hollow pipe body comprises the cavity, and the first internal thread is arranged on the inner wall of the hollow pipe body, namely the wall of the cavity; the hollow pipe body is provided with an outer wall, and the first external thread is arranged on the outer wall; a groove is formed in the outer wall of the hollow pipe body, the groove is adjacent to the first external thread, and the groove is located between the end portion of the far side of the hollow pipe body and the first external thread.

2. The drive mechanism as recited in claim 1, wherein the main nut has a central axis, and a first length of the first external thread is equal to a second length of the second internal thread along an extension of the central axis.

3. The driving mechanism as claimed in claim 1, wherein the first internal thread is provided on the entire inner wall of the hollow tube body, or wherein the first internal thread is provided on a part of the inner wall of the hollow tube body.

4. The drive mechanism as recited in claim 1, wherein the first external thread is disposed proximate a distal side of the hollow tube relative to a proximal side of the hollow tube.

5. The drive mechanism as recited in claim 1, wherein the first external thread and the second internal thread are engaged with each other when the drive mechanism is in an initial state; when the driving mechanism is in a first working state, the outer thread sleeve moves relative to the main thread sleeve along the central axis of the main thread sleeve towards the far side of the main thread sleeve, the first outer thread and the second inner thread are separated from each other, so that the second inner thread is suspended in the groove and is not contacted with the bottom of the groove; wherein, the groove is not provided with a thread structure.

6. The drive mechanism as recited in claim 1, wherein the second internal thread is disposed proximal to the outer sleeve.

7. The drive mechanism as recited in claim 1, wherein the outer sleeve has a recess on an outer surface thereof; when the driving mechanism is assembled in the first shell, the first shell is provided with a boss which is embedded into the concave part, and the boss is matched with the concave part to limit the outer sleeve to rotate around the central shaft of the main threaded sleeve.

8. The drive mechanism as recited in claim 1, wherein the screw includes a screw proximal end, a screw body, and a screw distal end connected in series, the second external thread being disposed at the screw proximal end, the screw body having a smooth outer surface.

9. The drive mechanism of claim 8, wherein the radial width of the screw body and the radial width of the screw distal end are each less than the radial width of the screw proximal end such that the screw body and the screw distal end are suspended in the chamber.

10. The drive mechanism of claim 8, wherein the distal end of the screw includes an opening and a slot; the stopping part at the near end part of the mandrel is accommodated in the sliding groove; the second groove wall of the sliding groove is adjacent to the opening, and the opening extends through the second groove wall, so that the opening is communicated with the sliding groove.

11. The drive mechanism as recited in claim 10, wherein the chute has a first notch, the first notch communicating with the chute such that the chute is an open chute.

12. The drive mechanism as claimed in any one of claims 10 and 11, wherein the opening has a second notch, the second notch communicating with the opening such that the opening is an open opening.

13. The drive mechanism as recited in claim 10, wherein a distance between the first slot wall and the second slot wall of the slot is a third length, the third length being equal to a sum of the first length of the first external thread and a height of the stop portion and equal to a sum of the second length of the second internal thread and the height of the stop portion.

14. The driving mechanism as recited in claim 13, wherein the stop portion contacts the second groove wall when the driving mechanism is in the initial state; when the driving mechanism is in a first working state, the sliding groove slides relative to the stopping part, and the first groove wall contacts the stopping part.

15. The drive mechanism as recited in claim 8, wherein the screw further comprises a reset protrusion disposed at a distal end of the screw.

16. The drive mechanism of claim 8, wherein the screw body has first and second opposing planar portions, the main threaded sleeve having a central axis, the first planar portion being located above the central axis and the second planar portion being located below the central axis, wherein the first and second planar portions are configured to limit rotation of the screw about the central axis.

17. The drive mechanism as recited in claim 1, wherein the main nut has a central axis, and wherein rotation of the main nut about the central axis causes the outer nut and the screw to move linearly along the central axis, respectively.

18. An electric stapler, characterized by comprising: a drive mechanism according to any one of claims 1 to 17.

19. The electric stapler according to claim 18, further comprising a driving motor and a first housing, wherein the driving motor is fixed in the first housing, and an output shaft of the driving motor is fixedly connected to the main screw sleeve of the driving mechanism, when the driving motor is started, the main screw sleeve rotates around a central axis of the main screw sleeve, and the outer screw sleeve and the screw rod move linearly along the central axis of the main screw sleeve.

20. The powered stapler of claim 19, further comprising an elongate shaft and an end effector, the end effector including first and second jaws pivotally coupled to one another; the first jaw is connected to the distal side of the elongated shaft, and the drive mechanism is connected to the proximal side of the elongated shaft; the main screw sleeve rotates along the central axis in a first direction, so that the outer screw sleeve linearly moves along the central axis towards the end effector, and the first jaw is pivoted to be closed on the second jaw; the main screw sleeve rotates around the central axis along a second direction, so that the outer screw sleeve linearly moves along the central axis towards a direction far away from the end effector, and the first jaw pivots to open from the second jaw; the first direction is opposite to the second direction.

21. The powered stapler of claim 20, further comprising a push frame, a proximal side of the push frame coupled to a distal side of the drive mechanism, a distal side of the push frame coupled to a proximal side of the elongated shaft.

22. The powered stapler of claim 21, wherein the elongated shaft includes a cannula, the first jaw being coupled to a distal side of the cannula; the near side of the pushing frame is fixedly connected with the far side of the outer sleeve of the driving mechanism, and the far side of the pushing frame is fixedly connected with the near side of the sleeve; the outer sleeve moves linearly along the central axis towards the end effector, so that the pushing frame pushes the sleeve to move towards the end effector, and the sleeve pivots the first jaw to close the first jaw and the second jaw; or the outer sleeve moves linearly along the central axis in the direction away from the end effector, so that the pushing frame drives the sleeve to move linearly in the direction away from the end effector, and the sleeve pivots the first jaw to open the first jaw from the second jaw.

23. The powered stapler of claim 19, further comprising an elongate shaft and an end effector, a proximal end of the end effector coupled to a distal end of the elongate shaft; the slender shaft comprises a mandrel and a cutting knife; the near side of the mandrel is connected with the screw rod far end of the screw rod, and the far side of the mandrel is connected with the cutting knife; the main threaded sleeve rotates around the central axis along a first direction, so that the screw rod moves linearly along the central axis towards the end effector, the screw rod pushes the mandrel to move linearly along the central axis towards the end effector, and the cutting knife is further pushed to enter the end effector to perform cutting and anastomosis operations; the main threaded sleeve rotates around the central axis along a second direction, so that the screw rod linearly moves along the central axis towards the direction far away from the end effector, the screw rod drives the mandrel to linearly move along the central axis towards the direction far away from the end effector, and the cutting knife is withdrawn from the end effector to perform knife returning operation; the first direction is opposite to the second direction.