Oscillating head mechanism and linear stapler

Abstract

The present invention provides a swing head mechanism and a linear stapler. The swing head mechanism includes a cartridge housing and a swing head pull rod. A cavity for accommodating the swing head pull rod is formed on the side surface of the cartridge housing. The swing head pull rod has an initial position, and the swing head pull rod can move along the axial direction of the cartridge housing and deviate from the initial position. A positioning hole is formed on the surface of the swing head pull rod, and an elastic positioning member is arranged on the inner side surface of the cavity. When the swing head pull rod is in the initial position, the top end of the elastic positioning member enters the corresponding positioning hole. By adopting the present invention, the initial position of the swing head pull rod is positioned through the positioning hole of the swing head pull rod and the positioning member at the cavity of the cartridge housing, so as to improve the installation efficiency and accuracy of the swing head pull rod and the cartridge housing. Moreover, the positioning member is an elastic positioning member. When the swing head pull rod moves, the elastic positioning member will generate certain deformation to yield to the movement of the swing head pull rod, and will not cause the swing head pull rod to deform due to the contact pressure between the elastic positioning member and the swing head pull rod.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a swing head mechanism and a linear stapler. Background Art

[0002] Digestive tract diseases are one of the high-incidence diseases in humans. During the treatment process, staplers are often used to replace the manual operation of doctors to anastomose physiological tissues such as the digestive tract. A linear stapler is a common surgical instrument with an outer shell, and most of them adopt a linear stapling method to anastomose physiological tissues such as the esophagus, stomach, and intestine during surgery.

[0003] A linear stapler generally includes an instrument platform and a head detachably mounted on the platform. The head can pass through a small incision on the body through a trocar to approach the surgical site for surgery. Specifically, the instrument platform includes a firing handle, and the detachable head includes a staple cartridge housing and a staple head mounted at the distal end of the staple cartridge housing. A firing assembly is provided inside the staple cartridge housing, and the staple head is the part that performs cutting and suturing actions. Driven by the firing handle, the firing assembly can drive the staple head to complete the suture and cutting operation.

[0004] In order to realize the swing of the staple head relative to the staple cartridge housing, a swing head pull rod is provided in the staple cartridge housing. The proximal end of the swing head pull rod is connected to a swing head driving member, and the distal end of the swing head pull rod is rotatably fixed to the proximal end of the staple head. When the swing head driving member drives the swing head pull rod to move axially along the staple cartridge housing, the distal end of the swing head pull rod drives the staple head to swing clockwise or counterclockwise relative to the staple cartridge housing. Here, the distal end and the proximal end are relative to the operator. The end closer to the operator is the proximal end, and the end farther from the operator, that is, the end closer to the surgical position is the distal end. In the stapler, the inner side and the outer side are relative to the axis of the stapler. The side closer to the axis is the inner side, and the side farther from the axis is the outer side.

[0005] In the existing linear stapler, there is no initial positioning mechanism between the swing head pull rod and the staple cartridge housing, and the initial position between the swing head pull rod and the staple cartridge housing cannot be determined, which brings inconvenience to the installation of the instrument and cannot ensure the accuracy of the installation of the swing head pull rod and the staple cartridge housing. Summary of the Invention

[0006] Aiming at the problems in the prior art, the purpose of the present invention is to provide a swing head mechanism and a linear stapler, which realize the initial position positioning of the swing head pull rod through the positioning hole of the swing head pull rod and the positioning member at the cavity of the staple cartridge housing, and the positioning member adopts an elastic positioning member, which will not compress the swing head pull rod to deform when the swing head pull rod moves.

[0007] An embodiment of the present invention provides a swing head mechanism for a linear stapler. The swing head mechanism includes a cartridge housing and a swing head pull rod. A cavity for accommodating the swing head pull rod is formed on the side surface of the cartridge housing. The swing head pull rod has an initial position, and the swing head pull rod can move along the axial direction of the cartridge housing and deviate from the initial position.

[0008] Positioning holes are formed on the surface of the swing head pull rod, and elastic positioning members are arranged on the inner side surface of the cavity. When the swing head pull rod is in the initial position, the top end of the elastic positioning member enters the corresponding positioning hole. When the swing head pull rod moves and deviates from the initial position, the elastic positioning member disengages from the positioning hole, and the pressure of the swing head pull rod causes the top end of the elastic positioning member to move in a direction away from the swing head pull rod.

[0009] Optionally, the cartridge housing includes an upper housing and a lower housing, and the cavity is formed between the upper housing and the lower housing.

[0010] Optionally, the positioning holes are formed on the lower surface of the swing head pull rod, and the elastic positioning members are arranged on the upper surface of the lower housing.

[0011] Optionally, the positioning holes are formed on the upper surface of the swing head pull rod, and the elastic positioning members are arranged on the lower surface of the upper housing.

[0012] Optionally, the positioning holes are through holes or blind holes.

[0013] Optionally, the elastic positioning member includes a spring piece protruding towards the positioning hole. Both 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.

[0014] Optionally, the elastic positioning member includes a spring piece protruding towards the positioning hole and a positioning block arranged at the protruding part of the spring piece. Both 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.

[0015] Optionally, the spring piece is a metal spring piece or a plastic spring piece.

[0016] Optionally, the positioning block is a ball head pin, and the ball head pin includes a stepped portion and a ball head portion located at the top end of the stepped portion. The stepped portion is installed at the top end of the spring piece.

[0017] Optionally, an installation groove for accommodating the elastic positioning member is formed on the inner side surface of the cavity. The installation groove includes a first section and a second section that are communicated with each other. The elastic piece and the stepped portion of the ball head pin are located in the second section, the ball head portion of the ball head pin is located in the first section, a stepped surface is provided between the first section and the second section. When the stepped portion of the ball head pin contacts the stepped surface, the stepped surface blocks the stepped portion from entering the first section.

[0018] Optionally, an installation hole communicated with the installation groove is formed in the nail magazine housing, and the diameter of the installation hole is larger than the diameter of the stepped portion of the ball head pin.

[0019] Optionally, the elastic positioning member includes a compression spring arranged on the inner side surface of the cavity and a positioning block arranged at the top end of the compression spring.

[0020] Optionally, the positioning block is a ball head pin, and the ball head pin includes a stepped portion and a ball head portion located at the top end of the stepped portion. The stepped portion is installed at the top end of the compression spring.

[0021] Optionally, an installation groove for accommodating the elastic positioning member is formed on the inner side surface of the cavity. The installation groove includes a first section and a second section that are communicated with each other. The compression spring and the stepped portion of the ball head pin are located in the second section, the ball head portion of the ball head pin is located in the first section, a stepped surface is provided between the first section and the second section. When the stepped portion of the ball head pin contacts the stepped surface, the stepped surface blocks the stepped portion from entering the first section.

[0022] Optionally, an installation hole communicated with the installation groove is formed in the nail magazine housing, and the diameter of the installation hole is larger than the diameter of the stepped portion of the ball head pin.

[0023] Optionally, the ball head pin further includes a guiding portion arranged at the bottom end of the stepped portion, and the guiding portion penetrates through the inside of the compression spring.

[0024] Optionally, an installation groove for accommodating the elastic positioning member is formed on the inner side surface of the cavity. When the swing head pull rod is in the initial position, the top end of the elastic positioning member protrudes from the installation groove.

[0025] Optionally, a first guiding surface is provided on the distal side of the positioning block, and a second guiding surface is provided on the proximal side of the positioning block. When the swing head pull rod moves from the initial position towards the distal direction, the second guiding surface contacts the swing head pull rod and guides the positioning block to disengage from the positioning hole. When the swing head pull rod moves from the initial position towards the proximal direction, the first guiding surface contacts the swing head pull rod and guides the positioning block to disengage from the positioning hole.

[0026] 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.

[0027] Optionally, one or more positioning holes are formed on the surface of the swing head pull rod, and one or more elastic positioning members are arranged on the inner side surface of the cavity. When the swing head pull rod is in the initial position, the top end of at least one elastic positioning member enters the positioning hole.

[0028] An embodiment of the present invention further provides a linear stapler, and the stapler includes the swing head mechanism as described above.

[0029] The swing head mechanism and the linear stapler provided by the present invention have the following advantages:

[0030] The present invention provides a swing head mechanism for a linear stapler. Through the positioning hole of the swing head pull rod and the positioning member at the cavity of the cartridge housing, the initial position positioning of the swing head pull rod is realized, the installation efficiency and accuracy of the swing head pull rod and the cartridge housing are improved, and the positioning member adopts an elastic positioning member. When the swing head pull rod moves, the elastic positioning member will generate a certain deformation to make way for the movement of the swing head pull rod, and the swing head pull rod will not be deformed due to the contact between the elastic positioning member and the swing head pull rod. Description of the Drawings

[0031] By reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, other features, objects and advantages of the present invention will become more apparent.

[0032] Figure 1 is a schematic structural diagram of the swing head mechanism of the present invention;

[0033] Figure 2 is corresponding to the first embodiment of the present invention Figure 1 a cross-sectional view taken along the D1-D1 direction in;

[0034] Figure 3 is Figure 2 a cross-sectional view taken along the C1-C1 direction in;

[0035] Figure 4 is Figure 2 an enlarged view at A1 in;

[0036] Figure 5 is a schematic structural diagram of the installation groove of the first embodiment of the present invention;

[0037] Figure 6 is an enlarged view at A1 after adding an installation hole in the first embodiment of the present invention;

[0038] Figure 7 is a schematic diagram of the swing head mechanism after the swing head pull rod moves proximally in the first embodiment of the present invention;

[0039] Figure 8 is Figure 7 A cross-sectional view in the D2-D2 direction in

[0040] Figure 9 is Figure 7 An enlarged view at A2 in

[0041] Figure 10 is the corresponding cross-sectional view in the D1-D1 direction of the second embodiment of the present invention Figure 1 in

[0042] Figure 11 is Figure 10 A cross-sectional view in the C2-C2 direction in

[0043] Figure 12 is Figure 10 An enlarged view at A3 in

[0044] Figure 13 is a schematic structural view of the installation groove of the second embodiment of the present invention

[0045] Figure 14 is an enlarged view at A3 after adding an installation hole in the second embodiment of the present invention

[0046] Figure 15 is a schematic view of the swing head mechanism after the swing head pull rod moves to the distal end in the second embodiment of the present invention

[0047] Figure 16 is Figure 15 A cross-sectional view in the D3-D3 direction in

[0048] Figure 17 is Figure 16 An enlarged view at A4 in

[0049] Reference numerals:

[0050] 1 nail magazine housing 32 positioning block of the first embodiment

[0051] 11 upper housing 321 spherical head portion of the first embodiment

[0052] 111 distal end of the upper housing 322 stepped portion of the first embodiment

[0053] 112 proximal end of the upper housing 4 installation groove of the first embodiment

[0054] 12 lower housing 41 first section of the installation groove

[0055] 121 distal end of the lower housing 42 second section of the installation groove

[0056] 122 proximal end of the lower housing 43 stepped surface of the installation groove

[0057] 123 Mounting Hole 7 Positioning Member of the Second Embodiment

[0058] 2 Swing Head Pull Rod 71 Compression Spring

[0059] 21 Distal End of the Swing Head Pull Rod 72 Positioning Block of the Second Embodiment

[0060] 22 Proximal End of the Swing Head Pull Rod 721 Ball Head of the Second Embodiment

[0061] 23 Positioning Hole 722 Step Portion of the Second Embodiment

[0062] 3 Positioning Member of the First Embodiment 723 Guide Portion

[0063] 31 Elastic Sheet 8 Mounting Groove of the Second Embodiment

[0064] 311 First End of the Elastic Sheet 81 First Section of the Mounting Groove

[0065] 312 Second End of the Elastic Sheet 82 Second Section of the Mounting Groove

[0066] 313 Protruding Portion of the Elastic Sheet 83 Step Surface of the Mounting Groove Detailed Embodiment

[0067] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their repetitive description will be omitted.

[0068] To solve the technical problems in the prior art, the present invention provides a swing head mechanism for a linear stapler. For a linear stapler, the swing head mechanism includes a cartridge housing and a swing head pull rod. A cavity for accommodating the swing head pull rod is formed on the side surface of the cartridge housing. The swing head pull rod has an initial position, and the swing head pull rod can move axially along the cartridge housing to deviate from the initial position. A positioning hole is formed on the surface of the swing head pull rod, and an elastic positioning member is arranged on the inner side surface of the cavity. When the swing head pull rod is in the initial position, the top end of the elastic positioning member enters the corresponding positioning hole. Therefore, through the positioning hole of the swing head pull rod and the positioning member at the cavity of the cartridge housing, the initial position of the swing head pull rod is positioned, improving the installation efficiency and accuracy of the swing head pull rod and the cartridge housing. The present invention also includes a linear stapler including the swing head mechanism.

[0069] In addition, considering that when the swing rod moves towards the distal end or the proximal end, the elastic positioning member will be misaligned with the positioning hole and separated from each other, and the part of the swing rod without the positioning hole will exert pressure on the positioning hole. If the positioning member is a non-elastic positioning member, the swing rod may be deformed due to this pressure, resulting in an impact on the rotation angle accuracy of the nail head. Therefore, in the present invention, the positioning member is further selected as an elastic positioning member. When the swing rod moves and deviates from the initial position, after the elastic positioning member is separated from the positioning hole, and the pressure of the swing rod causes the top end of the elastic positioning member to move away from the swing rod, so as to make way for the movement of the swing rod, and the swing rod will not be deformed due to the contact between the elastic positioning member and the swing rod.

[0070] The following specifically introduces the structure of the swing mechanism of the present invention with reference to the accompanying drawings. Among them Figures 1 - 9 shows the first embodiment of the present invention, Figures 10 - 17 shows the second embodiment of the present invention.

[0071] As Figures 1 - 9 shown, in the first embodiment of the present invention, the swing mechanism includes a staple cartridge housing 1 and a swing rod 2. A cavity for accommodating the swing rod 2 is formed on the side surface of the staple cartridge housing 1. The swing rod 2 has an initial position, and the swing rod 2 can move along the axial direction of the staple cartridge housing 1 and deviate from the initial position. The proximal end 22 of the swing rod 2 is matched with a swing driving member on the stapler body, and the distal end 21 of the swing rod 2 is rotatably connected to the nail head of the stapler. Under the driving action of the swing driving member, the swing rod 2 can move along the axial direction of the staple cartridge housing 1 towards the distal end or the proximal end, so as to drive the nail head to rotate in a specific direction. Therefore, the control accuracy of the swing rod 2 determines the rotation angle control accuracy of the nail head.

[0072] A positioning hole 23 is formed on the surface of the swing rod 2, and an elastic positioning member 3 is arranged on the inner side surface of the cavity. When the swing rod 2 is in the initial position, the top end of the elastic positioning member 3 enters the corresponding positioning hole 23, so as to realize the initial position positioning of the swing rod 2, improve the installation efficiency and accuracy of the swing rod 2 and the staple cartridge housing 1. At this time, the elastic positioning member 3 is not deformed or only has an initial deformation. When the swing rod 2 moves and deviates from the initial position, the elastic positioning member 3 is separated from the positioning hole 23, and further deforms under the pressure of the swing rod 2, so that the top end of the elastic positioning member 3 moves away from the swing rod 2, so as to make way for the movement of the swing rod 2, and the swing rod will not be deformed due to the contact between the elastic positioning member 3 and the swing rod 2, and the rotation angle control accuracy of the nail head will not be affected. Here, the top end of the elastic positioning member 3 moves away from the swing rod 2, which can be as Figure 4In the perspective of [description is missing here], the top end of the elastic positioning member 3 moves downward, but the present invention is not limited thereto. Actually, the moving direction of the top end of the elastic positioning member 3 can also form a certain angle with the up and down direction, as long as it can move away from the swing rod 2 to make way for the movement of the swing rod 2.

[0073] In this embodiment, the magazine housing 1 includes an upper housing 11 and a lower housing 12, and the cavity is formed between the upper housing 11 and the lower housing 12. The distal ends 111 of the upper housing 11 and 121 of the lower housing 12 are opposite to each other, and the proximal ends 112 of the upper housing 11 and 122 of the lower housing 12 are opposite to each other. In this embodiment, the positioning hole 23 is provided on the lower surface of the swing rod 2, and the positioning hole 23 can be a through hole or a blind hole. The elastic positioning member 3 is provided on the upper surface of the lower housing 12. In other alternative embodiments, the positioning hole 23 can also be provided on the upper surface of the swing rod 2, and the elastic positioning member 3 is provided on the lower surface of the upper housing 11, as long as the positioning hole 23 and the elastic positioning member 3 are oppositely arranged.

[0074] In this embodiment, the elastic positioning member 3 includes a spring piece 31 protruding towards the positioning hole 23 and a positioning block 32 provided at the protruding portion 313 of the spring piece 31. The first end 311 and the second end 312 of the spring piece 31 are provided on the inner side surface of the cavity, and at least one end of the spring piece 31 is movable. In this embodiment, the first end 311 of the spring piece 31 is fixed and immovable, and the second end 312 of the spring piece 31 can move along with the deformation of the spring piece 31. The moving direction of the second end 312 of the spring piece 31 is not limited, as long as the up and down movement of the protruding portion 313 of the spring piece 31 can be realized.

[0075] As Figure 8 and Figure 9 shown, when the swing rod 2 deviates from the initial position and presses the top end of the positioning block 32, the spring piece 31 deforms downward, and the top end of the positioning block 32 moves downward to make way for the swing rod 2, without giving an upward reaction force to the swing rod 2, and thus will not press the swing rod 2 to deform. Figure 8 The structure when the swing rod 2 moves towards the proximal end is shown in [description is missing here]. It can be understood that when the swing rod 2 moves towards the distal end relative to the initial position, the spring piece 31 also deforms downward, and the top end of the positioning block 32 moves downward to make way for the swing rod 2.

[0076] In this embodiment, the spring piece 31 can be a metal spring piece 31 or a plastic spring piece 31, and other materials that can deform under external force and can return after the external force is removed can also be used. The shape of the spring piece 31 is not limited to that shown in the figure, and other shapes can also be adopted, all of which fall within the protection scope of the present invention.

[0077] In this embodiment, the positioning block 32 is a ball head pin. The ball head pin includes a stepped portion 322 and a ball head portion 321 located at the top end of the stepped portion 322. The stepped portion 322 is installed at the top end of the elastic piece 31.

[0078] An installation groove 4 for accommodating the elastic positioning member 3 is formed on the inner side surface of the cavity. The installation groove 4 includes a first section 41 and a second section 42 that are communicated with each other. The elastic piece 31 and the stepped portion 322 of the ball head pin are located in the second section 42, and at least one end of the elastic piece 31 can move in the second section 42 of the installation groove 4. The ball head portion 321 of the ball head pin is located in the first section 41. In order to prevent the ball head pin from detaching from the installation groove 4, a stepped surface 43 is provided between the first section 41 and the second section 42. When the stepped portion 322 of the ball head pin contacts the stepped surface 43, the stepped surface 43 blocks the stepped portion 322 from entering the first section 41.

[0079] In this embodiment, in order to install the positioning block 32 and the elastic piece 31, an installation hole 123 communicated with the installation groove 4 can be formed on the cartridge case housing 1. The diameter of the installation hole 123 is larger than the diameter of the stepped portion 322 of the ball head pin, so as to ensure that the positioning block 32 can be installed into the installation groove 4 from the installation hole 123.

[0080] 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 towards the positioning hole 23. Both ends of the elastic piece 31 are arranged on the inner side surface of the cavity, and at least one end of the elastic piece 31 is movable. When the swing head pull rod 2 is in the initial position, the top end of the elastic piece 31 directly extends into the positioning hole 23 of the swing head pull rod 2 to realize the positioning of the initial position of the swing head pull rod 2. At this time, the elastic piece 31 has no deformation or only an initial deformation. When the swing head pull rod 2 deviates from the initial position, the swing head pull rod 2 directly presses the protruding portion 313 of the elastic piece 31, so that the protruding portion 313 of the elastic piece 31 moves downward to give way to the axial movement of the swing head pull rod 2.

[0081] As Figures 10 - 17 shown, the structure of the swing head mechanism according to another embodiment of the present invention is shown. The difference between this embodiment and the previous embodiment is that: the elastic positioning member 7 includes a compression spring 71 arranged on the inner side surface of the cavity and a positioning block 72 arranged at the top end of the compression spring 71.

[0082] In this embodiment, the positioning block 72 can be a ball head pin. The ball head pin includes a stepped portion 722 and a ball head portion 721 located at the top end of the stepped portion 722. The stepped portion 722 is installed at the top end of the compression spring 71.

[0083] An installation groove 8 for accommodating the elastic positioning member 7 is provided on the inner side surface of the cavity. The installation groove 8 includes a first section 81 and a second section 82 that are in communication with each other. The compression spring 71 and the stepped portion 722 of the ball head pin are located in the second section 82, and the ball head portion 721 of the ball head pin is located in the first section 81. In order to prevent the ball head pin from disengaging from the installation groove 4, a stepped surface 83 is provided between the first section 81 and the second section 82. When the stepped portion 722 of the ball head pin contacts the stepped surface 83, the stepped surface 83 blocks the stepped portion 722 from entering the first section.

[0084] In this embodiment, in order to install the positioning block 82 and the compression spring 81, an installation hole 123 communicating with the installation groove 8 may be formed in the cartridge case. The diameter of the installation hole 123 is larger than the diameter of the stepped portion 722 of the ball head pin, so as to ensure that the positioning block 82 can be installed in the installation groove 8 through the installation hole 123. A cover body adapted to the installation hole 123 may be provided at the bottom end of the installation groove 8 to limit the bottom end of the compression spring 81. Alternatively, this cover body may not be provided, and the compression spring 81 may be limited by a sleeve sleeved outside the cartridge case 1.

[0085] In this embodiment, in order to better guide the movement direction of the ball head pin and enable the ball head pin and the compression spring 71 to cooperate better, the ball head pin further includes a guiding portion 723 provided at the bottom end of the stepped portion 722, and the guiding portion 723 penetrates through the inside of the compression spring 71.

[0086] Only the implementation manners of two specific embodiments of the present invention are described above. It can be understood that the above two embodiments are only examples and should not be used as a limitation on the protection scope of the present invention. The technical features of the above two embodiments can be combined and replaced with each other to form a new technical solution, which all fall within the protection scope of the present invention. Several alternative implementation manners are further introduced below, and these implementation manners can also be combined with the above two embodiments.

[0087] In other implementation manners, the elastic positioning member may not adopt the structure in the above embodiment. An installation groove for accommodating the elastic positioning member may be formed on the inner side surface of the cavity corresponding to the elastic positioning member. When the swing head pull rod 2 is in the initial position, the top end of the elastic positioning member protrudes from the installation groove and can enter the positioning hole 23.

[0088] In other embodiments, when the elastic positioning member includes a positioning block, the positioning block may not use the ball head pin, but use a positioning block with other shapes. A first guiding surface may be provided on the distal side of the positioning block, and a second guiding surface may be provided on the proximal side of the positioning block. When the swing head pull rod moves from the initial position in the distal direction, the second guiding surface contacts the swing head pull rod 2 and guides the positioning block out of the positioning hole 23. When the swing head pull rod 2 moves from the initial position in the proximal direction, the first guiding surface contacts the swing head pull rod 2 and guides the positioning block 23 out of the positioning hole 23, so as to make the axial movement of the swing head pull rod 2 smoother. In an alternative embodiment, the first guiding surface may be an inclined surface or an arc surface, and the second guiding surface may be an inclined surface or an arc surface.

[0089] The first embodiment and the second embodiment only give the embodiments of one positioning hole 23 and one elastic positioning member. In practical applications, one or more positioning holes 23 may be formed on the surface of the swing head pull rod 2, and one or more elastic positioning members may be provided on the inner side surface of the cavity. When the swing head pull rod 2 is in the initial position, the top end of at least one elastic positioning member enters the positioning hole 23. By providing multiple positioning holes 23 and / or multiple elastic positioning members, multiple different positioning positions of the swing head pull rod 2 can be set.

[0090] The swing head mechanism and the linear stapler provided by the present invention have the following advantages:

[0091] The present invention provides a swing head mechanism for a linear stapler. Through the positioning hole of the swing head pull rod and the positioning member at the cavity of the cartridge housing, the initial position positioning of the swing head pull rod is realized, the installation efficiency and accuracy of the swing head pull rod and the cartridge housing are improved, and the positioning member adopts an elastic positioning member. When the swing head pull rod moves, the elastic positioning member will produce a certain deformation to make way for the movement of the swing head pull rod, and the swing head pull rod will not be deformed due to the contact between the elastic positioning member and the swing head pull rod.

[0092] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A swing head mechanism, characterized in that, For a linear stapler, the swing head mechanism includes a cartridge housing and a swing head pull rod. A cavity for accommodating the swing head pull rod is formed on the side surface of the cartridge housing. The swing head pull rod has an initial position, and the swing head pull rod can move axially along the cartridge housing and deviate from the initial position. A positioning hole is formed on the surface of the swing head pull rod. The positioning hole is a blind hole. An elastic positioning member is arranged on the inner side surface of the cavity. When the swing head pull rod is in the initial position, the top end of the elastic positioning member enters the corresponding positioning hole. When the swing head pull rod moves and deviates from the initial position, the elastic positioning member disengages from the positioning hole, and the pressure of the swing head pull rod causes the top end of the elastic positioning member to move away from the swing head pull rod.

2. The swing head mechanism according to claim 1, characterized in that, The positioning hole is formed on the lower surface of the swing head pull rod. The cartridge housing includes an upper housing and a lower housing. The elastic positioning member is arranged on the upper surface of the lower housing.

3. The swing head mechanism according to claim 1, characterized in that, The elastic positioning member includes a spring piece protruding towards the positioning hole and a positioning block arranged at the protruding part of the spring piece. Both 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.

4. The swing head mechanism according to claim 3, characterized in that, The spring piece is a metal spring piece or a plastic spring piece.

5. The swing head mechanism according to claim 3, characterized in that, The positioning block is a ball head pin. The ball head pin includes a stepped portion and a ball head portion located at the top end of the stepped portion. The stepped portion is installed at the top end of the spring piece.

6. The swing head mechanism according to claim 5, wherein, An installation groove for accommodating the elastic positioning member is formed on the inner side surface of the cavity. The installation groove includes a first section and a second section communicated with each other. The spring piece and the stepped portion of the ball head pin are located in the second section, and the ball head portion of the ball head pin is located in the first section. A stepped surface is arranged between the first section and the second section. When the stepped portion of the ball head pin contacts the stepped surface, the stepped surface blocks the stepped portion from entering the first section.

7. The swing head mechanism according to claim 6, characterized in that, An installation hole communicated with the installation groove is formed on the cartridge housing. The diameter of the installation hole is larger than the diameter of the stepped portion of the ball head pin.

8. The swing head mechanism according to claim 1, wherein, The elastic positioning member includes a compression spring arranged on the inner side surface of the cavity and a positioning block arranged at the top end of the compression spring.

9. The swing head mechanism according to claim 8, wherein, The positioning block is a ball head pin. The ball head pin includes a stepped portion and a ball head portion located at the top end of the stepped portion. The stepped portion is installed at the top end of the compression spring.

10. The swing head mechanism according to claim 9, characterized in that, An installation groove for accommodating the elastic positioning member is formed on the inner side surface of the cavity. The installation groove includes a first section and a second section communicated with each other. The compression spring and the stepped portion of the ball head pin are located in the second section, and the ball head portion of the ball head pin is located in the first section. A stepped surface is arranged between the first section and the second section. When the stepped portion of the ball head pin contacts the stepped surface, the stepped surface blocks the stepped portion from entering the first section.

11. The swing head mechanism according to claim 10, characterized in that, An installation hole communicated with the installation groove is formed on the cartridge housing. The diameter of the installation hole is larger than the diameter of the stepped portion of the ball head pin.

12. The swing head mechanism according to claim 9, characterized in that, The ball head pin further includes a guiding portion arranged at the bottom end of the stepped portion. The guiding portion penetrates through the inside of the compression spring.

13. The swing head mechanism according to claim 3 or 8, characterized in that, An installation groove for accommodating the elastic positioning member is formed on the inner side surface of the cavity. When the swing head pull rod is in the initial position, the top end of the elastic positioning member protrudes from the installation groove.

14. The swing head mechanism according to claim 3 or 8, characterized in that, The distal side of the positioning block has a first guiding surface, and the proximal side of the positioning block has a second guiding surface. When the swing head pull rod moves from the initial position towards the distal direction, the second guiding surface contacts the swing head pull rod and guides the positioning block out of the positioning hole. When the swing head pull rod moves from the initial position towards the proximal direction, the first guiding surface contacts the swing head pull rod and guides the positioning block out of the positioning hole.

15. The swing head mechanism according to claim 14, characterized in that, 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.

16. A linear stapler, characterized in that, The stapler includes the swing head mechanism according to any one of claims 1 to 15.

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