Swing mechanism and linear anastomatTechnical Field
The invention relates to the technical field of medical instruments, in particular to a head swinging mechanism and a linear anastomat.
Background
Digestive tract diseases are one of the diseases of high incidence of human beings, and in the treatment process, an anastomat is often used for anastomosing physiological tissues such as digestive tract and the like instead of manual operation of doctors. The linear anastomat is a common surgical instrument with a shell, and mostly adopts a linear binding mode to anastomose physiological tissues such as esophagus, stomach, intestinal tract and the like during operation.
Linear staplers typically include an instrument platform and a head removably mounted to the platform, which can be passed through a small incision in the body by a penetrator to access a surgical site to perform a procedure. Specifically, the instrument platform comprises a firing handle, the detachable head comprises a nail box shell and a nail head part arranged at the far end of the nail box shell, a firing assembly is arranged in the nail box shell, and the nail head part is a part for implementing cutting and stitching actions. Under the drive of the firing handle, the firing assembly can drive the nail head to finish the suture operation.
In order to realize the swing of the nail head relative to the nail box shell, a swing head pull rod is arranged in the nail box shell, the proximal end of the swing head pull rod is connected to a swing head driving piece, the distal end of the swing head pull rod is rotatably fixed to the proximal end of the nail head, and when the swing head driving piece drives the swing head pull rod to move along the axial direction of the nail box shell, the distal end of the swing head pull rod drives the nail head to swing clockwise or anticlockwise relative to the nail box shell. The distal and proximal ends are here the proximal ends with respect to the operator, the ends closer to the operator being the proximal ends, the ends further from the operator, i.e. the ends closer to the surgical site being the distal ends. In the anastomat, the inner side and the outer side are opposite to the axis of the anastomat, one side close to the axis is the inner side, and one side far away from the axis is the outer side.
In the existing linear anastomat, an initial positioning mechanism is not arranged between the swing pull rod and the nail box shell, the initial position between the swing pull rod and the nail box shell cannot be determined, inconvenience is brought to the installation of the instrument, and the installation accuracy of the swing pull rod and the nail box shell cannot be guaranteed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a swing mechanism and a linear anastomat, wherein the initial position positioning of a swing pull rod is realized through a positioning hole of the swing pull rod and a positioning piece at a cavity of a nail box shell, and the positioning piece adopts an elastic positioning piece, so that the swing pull rod is not pressed to deform when the swing pull rod moves.
The embodiment of the invention provides a head swinging mechanism which is used for a linear anastomat and comprises a nail box shell and a head swinging pull rod, wherein a cavity for accommodating the head swinging pull rod is formed in the side surface of the nail box shell, the head swinging pull rod has an initial position, and the head swinging pull rod can move along the axial direction of the nail box shell to deviate from the initial position;
The surface of the swing pull rod is provided with a positioning hole, the inner side surface of the cavity is provided with an elastic positioning piece, when the swing pull rod is in an initial position, the top end of the elastic positioning piece enters the corresponding positioning hole, when the swing pull rod moves to deviate from the initial position, the elastic positioning piece is separated from the positioning hole, and the pressure of the swing pull rod enables the top end of the elastic positioning piece to move towards a direction away from the swing pull rod.
Optionally, the magazine housing includes an upper housing and a lower housing, the cavity being formed between the upper housing and the lower housing.
Optionally, the lower surface of the swing pull rod is provided with the positioning hole, and the upper surface of the lower shell is provided with the elastic positioning piece.
Optionally, the upper surface of the swing pull rod is provided with the positioning hole, and the lower surface of the upper shell is provided with the elastic positioning piece.
Optionally, the positioning hole is a through hole or a blind hole.
Optionally, the elastic positioning piece comprises a spring piece protruding towards the positioning hole, two ends of the spring piece are arranged on the inner side surface of the cavity, and at least one end of the spring piece is movable.
Optionally, the elastic positioning piece comprises a spring plate protruding towards the positioning hole and a positioning block arranged at the protruding part of the spring plate, two ends of the spring plate are arranged on the inner side surface of the cavity, and at least one end of the spring plate is movable.
Optionally, the elastic sheet is a metal elastic sheet or a plastic elastic sheet.
Optionally, the positioning block is a ball stud, the ball stud includes a step portion and a ball portion located at the top end of the step portion, and the step portion is installed at the top end of the elastic sheet.
Optionally, an installation groove for accommodating the elastic positioning piece is formed in the inner side surface of the cavity, the installation groove comprises a first section and a second section which are communicated, the elastic piece and the step part of the ball pin are located in the second section, the ball part of the ball pin is located in the first section, a step surface is arranged between the first section and the second section, and when the step part of the ball pin contacts with the step surface, the step surface blocks the step part from entering the first section.
Optionally, a mounting hole communicated with the mounting groove is formed in the nail box shell, and the diameter of the mounting hole is larger than that of the step part of the ball pin.
Optionally, the elastic positioning piece comprises a pressure spring arranged on the inner side surface of the cavity and a positioning block arranged at the top end of the pressure spring.
Optionally, the positioning block is a ball stud, the ball stud includes a step portion and a ball portion located at the top end of the step portion, and the step portion is installed at the top end of the pressure spring.
Optionally, an installation groove for accommodating the elastic positioning piece is formed in the inner side surface of the cavity, the installation groove comprises a first section and a second section which are communicated, the step parts of the pressure spring and the ball pin are located in the second section, the ball part of the ball pin is located in the first section, a step surface is arranged between the first section and the second section, and when the step part of the ball pin contacts with the step surface, the step surface blocks the step part from entering the first section.
Optionally, a mounting hole communicated with the mounting groove is formed in the nail box shell, and the diameter of the mounting hole is larger than that of the step part of the ball pin.
Optionally, the ball stud further includes a guiding portion disposed at a bottom end of the step portion, and the guiding portion is disposed through an inside of the compression spring.
Optionally, an installation groove for accommodating the elastic positioning piece is formed in the inner side surface of the cavity, and when the swing pull rod is in the initial position, the top end of the elastic positioning piece protrudes out of the installation groove.
Optionally, the distal end side of the positioning block has a first guide surface, the proximal end side of the positioning block has a second guide surface, the second guide surface contacts the swing rod and guides the positioning block to be separated from the positioning hole when the swing rod moves from the initial position to the distal direction, and the first guide surface contacts the swing rod and guides the positioning block to be separated from the positioning hole when the swing rod moves from the initial position to the proximal direction.
Optionally, the first guiding surface is an inclined surface or an arc surface, and the second guiding surface is an inclined surface or an arc surface.
Optionally, the surface of the swing pull rod is provided with one or more positioning holes, the inner side surface of the cavity is provided with one or more elastic positioning pieces, and when the swing pull rod is at an initial position, the top end of at least one elastic positioning piece enters the positioning hole.
The embodiment of the invention also provides a linear anastomat, which comprises the head swinging mechanism.
The swing mechanism and the linear anastomat provided by the invention have the following advantages:
The invention provides a swing mechanism for a linear anastomat, which realizes the initial position positioning of a swing pull rod through a positioning hole of the swing pull rod and a positioning piece at a cavity of a nail box shell, improves the installation efficiency and accuracy of the swing pull rod and the nail box shell, adopts an elastic positioning piece, and when the swing pull rod moves, the elastic positioning piece can generate certain deformation to give way to the movement of the swing pull rod, and can not press the swing pull rod to deform because of the contact of the elastic positioning piece and the swing pull rod.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings.
FIG. 1 is a schematic view of the swing mechanism of the present invention;
FIG. 2 is a cross-sectional view of a first embodiment of the invention corresponding to the direction D1-D1 in FIG. 1;
FIG. 3 is a cross-sectional view taken along the direction C1-C1 in FIG. 2;
FIG. 4 is an enlarged view at A1 in FIG. 2;
FIG. 5 is a schematic view of the structure of the mounting groove of the first embodiment of the present invention;
FIG. 6 is an enlarged view of the first embodiment of the present invention at A1 with the addition of mounting holes;
FIG. 7 is a schematic view of the swing mechanism after the swing link of the first embodiment of the present invention has been moved proximally;
FIG. 8 is a cross-sectional view taken along the direction D2-D2 in FIG. 7;
FIG. 9 is an enlarged view at A2 in FIG. 7;
FIG. 10 is a cross-sectional view of a second embodiment of the invention corresponding to the direction D1-D1 in FIG. 1;
FIG. 11 is a cross-sectional view taken along the direction C2-C2 in FIG. 10;
FIG. 12 is an enlarged view at A3 in FIG. 10;
FIG. 13 is a schematic view of a mounting groove according to a second embodiment of the present invention;
FIG. 14 is an enlarged view of a second embodiment of the present invention at A3 with the addition of mounting holes;
FIG. 15 is a schematic view of the swing mechanism after the swing link of the second embodiment of the present invention has been moved distally;
FIG. 16 is a cross-sectional view taken along the direction D3-D3 in FIG. 15;
fig. 17 is an enlarged view at A4 in fig. 16.
Reference numerals:
1. positioning block of first embodiment of the magazine housing 32
11. Ball head of the first embodiment of the upper housing 321
111. Distal end 322 of the upper housing stepped portion of the first embodiment
112. Proximal end 4 of upper housing mounting groove of first embodiment
12. First section of the mounting groove of the lower housing 41
121. Second section of the distal end 42 mounting groove of the lower housing
122. Step surface of the mounting groove of the proximal end 43 of the lower housing
123. Positioning piece of second embodiment of mounting hole 7
2. Swing pull rod 71 compression spring
21. Positioning block of second embodiment of distal end 72 of swing rod
22. Proximal end 721 of swing rod ball head of second embodiment
23. Step portion of the second embodiment of the positioning hole 722
3. The positioning member 723 guide portion of the first embodiment
31. Spring piece 8 mounting groove of second embodiment
311. First end 81 of spring plate is mounted on first section of groove
312. Second end 82 of the spring plate mounts the second section of the slot
313. Step surface of convex part 83 mounting groove of spring plate
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.
In order to solve the technical problems in the prior art, the invention provides a head swinging mechanism for a linear anastomat, which is used for the linear anastomat, and comprises a nail box shell and a head swinging pull rod, wherein a cavity for accommodating the head swinging pull rod is formed in the side surface of the nail box shell, the head swinging pull rod has an initial position, the head swinging pull rod can move along the axial direction of the nail box shell to deviate from the initial position, a positioning hole is formed in the surface of the head swinging pull rod, an elastic positioning piece is arranged on the inner side surface of the cavity, and when the head swinging pull rod is in the initial position, the top end of the elastic positioning piece enters the corresponding positioning hole. Therefore, the initial position positioning of the swing pull rod is realized through the positioning hole of the swing pull rod and the positioning piece at the cavity of the nail box shell, and the efficiency and the accuracy of the installation of the swing pull rod and the nail box shell are improved. The invention also comprises a linear anastomat comprising the head swinging mechanism.
In addition, considering that when the swing rod moves towards the distal end or the proximal end, the elastic positioning piece and the positioning hole are dislocated and separated from each other, the position of the swing rod, where the positioning hole is not formed, can generate pressure on the positioning hole, and if the positioning piece adopts the inelastic positioning piece, the swing rod can deform due to the pressure, so that the precision of the rotation angle of the nail head is influenced. Therefore, the invention further selects the positioning piece to be an elastic positioning piece, when the swing pull rod moves to deviate from the initial position, the elastic positioning piece is separated from the positioning hole, and the pressure of the swing pull rod enables the top end of the elastic positioning piece to move towards the direction away from the swing pull rod, so that the movement of the swing pull rod is abducted, and the swing pull rod is not pressed to deform because of the contact of the elastic positioning piece and the swing pull rod.
The structure of the swing mechanism of the present invention will be specifically described with reference to the accompanying drawings. Wherein fig. 1-9 show a first embodiment of the invention and fig. 10-17 show a second embodiment of the invention.
As shown in fig. 1 to 9, in a first embodiment of the present invention, the swing mechanism includes a magazine housing 1 and a swing rod 2, a cavity for accommodating the swing rod 2 is formed on a side surface of the magazine housing 1, the swing rod 2 has an initial position, and the swing rod 2 can move along an axial direction of the magazine housing 1 to deviate from the initial position. The proximal end 22 of the swing pull rod 2 is matched with a swing driving piece on the anastomat body, the distal end 21 of the swing pull rod 2 is rotatably connected to the nail head of the anastomat, and under the driving action of the swing driving piece, the swing pull rod 2 can move distally or proximally along the axial direction of the nail box shell 1, so that the nail head is driven to rotate along a specific direction. Therefore, the control accuracy of the swing link 2 determines the rotation angle control accuracy of the head portion.
The locating hole 23 has been seted up on the surface of the pull rod of swaying 2, the medial surface of cavity is provided with the elastic locating piece 3, when the pull rod of swaying 2 is in initial position, the top of elastic locating piece 3 gets into corresponding locating hole 23 to realize the initial position location of pull rod of swaying 2, improve the efficiency and the accuracy of pull rod of swaying 2 and the installation of nail casket shell 1, the elastic locating piece 3 does not warp or only one initial deformation this moment. When the swing pull rod 2 moves to deviate from the initial position, the elastic positioning piece 3 is separated from the positioning hole 23, and is further deformed under the pressure of the swing pull rod 2, so that the top end of the elastic positioning piece 3 moves towards the direction away from the swing pull rod 2, the movement of the swing pull rod 2 is abducted, the swing pull rod is pressed to deform due to the contact of the elastic positioning piece 3 and the swing pull rod 2, and the control precision of the rotation angle of the nail head is not affected. Here, the tip of the elastic positioning member 3 may be moved in a direction away from the swing rod 2, and the tip of the elastic positioning member 3 may be moved downward in the view of fig. 4, but the present invention is not limited thereto, and the movement direction of the tip of the elastic positioning member 3 may be at a certain angle to the vertical direction, so long as the movement of the swing rod 2 can be yielded by being away from the swing rod 2.
In this embodiment, the magazine housing 1 includes an upper case 11 and a lower case 12, the cavity being formed between the upper case 11 and the lower case 12. Distal end 111 of upper housing 11 is opposite distal end 121 of lower housing 12, and proximal end 112 of upper housing 11 is opposite proximal end 122 of lower housing 12. In this embodiment, the lower surface of the swing rod 2 is provided with the positioning hole 23, the positioning hole 23 may be a through hole or a blind hole, and the upper surface of the lower housing 12 is provided with the elastic positioning member 3. In another alternative embodiment, the positioning hole 23 may be formed in the upper surface of the swing rod 2, and the elastic positioning member 3 may be formed in the lower surface of the upper case 11, so long as the positioning hole 23 and the elastic positioning member 3 are disposed opposite to each other.
In this embodiment, the elastic positioning member 3 includes a spring plate 31 protruding toward the positioning hole 23 and a positioning block 32 disposed at a protruding portion 313 of the spring plate 31, where a first end 311 of the spring plate 31 and a second end 312 of the spring plate 31 are disposed on an inner side surface of the cavity, and at least one end of the spring plate 31 is movable, in this embodiment, the first end 311 of the spring plate 31 is fixed and not movable, and the second end 312 of the spring plate 31 is movable along with deformation of the spring plate 31. The moving direction of the second end 312 of the elastic piece 31 is not limited as long as the protruding portion 313 of the elastic piece 31 can move up and down.
As shown in fig. 8 and 9, when the swing rod 2 deviates from the initial position to press the top end of the positioning block 32, the elastic piece 31 is deformed downward, the top end of the positioning block 32 moves downward to be located at the swing rod 2, and no upward reaction force is given to the swing rod 2, so that the swing rod 2 is not pressed to deform. In fig. 8, the structure of the swing rod 2 is shown when it moves proximally, it will be appreciated that when the swing rod 2 moves distally relative to the initial position, the spring plate 31 also deforms downwardly, and the top end of the positioning block 32 moves downwardly to rest on the swing rod 2.
In this embodiment, the elastic sheet 31 may be a metal elastic sheet 31 or a plastic elastic sheet 31, or may be made of other materials that can deform under an external force and recover after the external force is removed. The shape of the spring 31 is not limited to that shown in the drawings, and other shapes can be adopted, which fall within the scope of the present invention.
In this embodiment, the positioning block 32 is a ball stud, and the ball stud includes a step 322 and a ball 321 at a top end of the step 322, and the step 322 is mounted on the top end of the elastic piece 31.
The inner side of the cavity is provided with a mounting groove 4 for accommodating the elastic positioning piece 3, the mounting groove 4 comprises a first section 41 and a second section 42 which are communicated, the elastic piece 31 and the step part 322 of the ball pin are positioned in the second section 42, at least one end of the elastic piece 31 can move in the second section 42 of the mounting groove 4, and the ball part 321 of the ball pin is positioned in the first section 41. In order to limit the ball stud from being separated from the mounting groove 4, a step surface 43 is provided between the first section 41 and the second section 42, and the step surface 43 blocks the step portion 322 from entering the first section 41 when the step portion 322 of the ball stud contacts the step surface 43.
In this embodiment, in order to implement the installation of the positioning block 32 and the elastic piece 31, an installation hole 123 communicating with the installation groove 4 may be formed in the magazine housing 1, and the diameter of the installation hole 123 is greater than the diameter of the step portion 322 of the ball stud, so as to ensure that the positioning block 32 may be installed into the installation groove 4 from the installation hole 123.
In an alternative embodiment of the present invention, the elastic positioning member 3 may not include the positioning block 32, but only include the elastic piece 31 protruding toward the positioning hole 23, where two ends of the elastic piece 31 are disposed on the inner side surface of the cavity, and at least one end of the elastic piece 31 is movable. When the swing pull rod 2 is located at the initial position, the top end of the elastic piece 31 directly extends into the positioning hole 23 of the swing pull rod 2, so as to realize positioning of the initial position of the swing pull rod 2, and at this time, the elastic piece 31 is not deformed or only has one initial deformation. When the swing pull rod 2 deviates from the initial position, the swing pull rod 2 directly presses the protruding portion 313 of the elastic sheet 31, so that the protruding portion 313 of the elastic sheet 31 moves downwards to be away from the axial movement of the swing pull rod 2.
As shown in fig. 10 to 17, a structure of a swing mechanism according to another embodiment of the present invention is shown. This embodiment differs from the previous embodiment in that the elastic positioning member 7 includes a compression spring 71 disposed on the inner side surface of the cavity and a positioning block 72 disposed on the top end of the compression spring 71.
In this embodiment, the positioning block 72 may be a ball stud, which includes a step portion 722 and a ball portion 721 located at a top end of the step portion 722, and the step portion 722 is mounted to a top end of the compression spring 71.
The inner side surface of the cavity is provided with a mounting groove 8 for accommodating the elastic positioning piece 7, the mounting groove 8 comprises a first section 81 and a second section 82 which are communicated, the pressure spring 71 and the step part 722 of the ball pin are positioned in the second section 82, and the ball part 721 of the ball pin is positioned in the first section 81. In order to limit the ball stud from being separated from the mounting groove 4, a step surface 83 is arranged between the first section 81 and the second section 82, and when the step portion 722 of the ball stud contacts with the step surface 83, the step surface 83 blocks the step portion 722 from entering the first section.
In this embodiment, in order to implement the installation of the positioning block 82 and the compression spring 81, an installation hole 123 communicating with the installation groove 8 may be formed in the magazine housing, and the diameter of the installation hole 123 is greater than the diameter of the stepped portion 722 of the ball stud, so as to ensure that the positioning block 82 may be installed into the installation groove 8 through the installation hole 123. The bottom of the mounting groove 8 may be provided with a cover body adapted to the mounting hole 123, so as to limit the bottom of the compression spring 81. The cover may be omitted and the compression spring 81 may be limited by a sleeve fitted to the outside of the magazine housing 1.
In this embodiment, in order to better guide the movement direction of the ball stud so that the ball stud and the compression spring 71 are better engaged, the ball stud further includes a guide portion 723 provided at the bottom end of the stepped portion 722, and the guide portion 723 is penetrated inside the compression spring 71.
The foregoing describes only two specific embodiments of the present invention. It is to be understood that the above two embodiments are merely examples and should not be taken as limiting the scope of the invention. The technical features of the two embodiments can be mutually combined and replaced to form a new technical scheme, which belongs to the protection scope of the invention. Several alternative embodiments are further described below, and these embodiments may also be combined with the two examples described above.
In other embodiments, the elastic positioning member may not adopt the structure in the above embodiment. The inner side of the cavity may be provided with a mounting groove corresponding to the elastic positioning member for accommodating the elastic positioning member, and when the swing pull rod 2 is in the initial position, the top end of the elastic positioning member protrudes out of the mounting groove and can enter the positioning hole 23.
In other embodiments, where the resilient positioning member comprises a single positioning block, the positioning block may be other shaped than the ball stud. The distal end side of the positioning block may be provided with a first guide surface, the proximal end side of the positioning block may be provided with a second guide surface, when the swing rod moves from the initial position to the distal end direction, the second guide surface contacts with the swing rod 2 and guides the positioning block to disengage from the positioning hole 23, and when the swing rod 2 moves from the initial position to the proximal end direction, the first guide surface contacts with the swing rod 2 and guides the positioning block 23 to disengage from the positioning hole 23, so that the axial movement of the swing rod 2 is smoother. In an alternative embodiment, the first guiding surface may be a slope or an arc surface, and the second guiding surface may be a slope or an arc surface.
The first embodiment and the second embodiment only show an implementation manner of one positioning hole 23 and one elastic positioning piece, in practical application, the surface of the swing pull rod 2 may be provided with one or more positioning holes 23, the inner side surface of the cavity may be provided with one or more elastic positioning pieces, and when the swing pull rod 2 is in the initial position, the top end of at least one elastic positioning piece enters into the positioning hole 23. By providing a plurality of positioning holes 23 and/or a plurality of elastic positioning members, a plurality of different positioning positions of the swing link 2 can be provided.
The swing mechanism and the linear anastomat provided by the invention have the following advantages:
The invention provides a swing mechanism for a linear anastomat, which realizes the initial position positioning of a swing pull rod through a positioning hole of the swing pull rod and a positioning piece at a cavity of a nail box shell, improves the installation efficiency and accuracy of the swing pull rod and the nail box shell, adopts an elastic positioning piece, and when the swing pull rod moves, the elastic positioning piece can generate certain deformation to give way to the movement of the swing pull rod, and can not press the swing pull rod to deform because of the contact of the elastic positioning piece and the swing pull rod.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.