Jaw locking mechanism and stapler

Abstract

This invention provides a jaw locking mechanism and a stapler. The jaw locking mechanism includes: a sleeve with a stop at one end near the jaw assembly; a pin seat housed within the sleeve and positioned near the jaw assembly; a pull rod housed within the sleeve and connected at one end to the jaw assembly's pivot; a locking block housed within the pin seat and located inside the pull rod; a locking push rod housed within the pin seat and at least partially located on the side of the locking block opposite to the pull rod; and a locking spring housed within the pin seat and connected to the locking push rod. When the jaw assembly is in the open state, the locking push rod and the stop are locked together. When the jaw assembly is in the closed state, the locking spring can actively / passively push the locking push rod toward the jaw assembly, causing the locking push rod, locking block, and pull rod to abut and lock together. Compared to the prior art, the jaw locking mechanism of this invention can achieve stable locking of the jaw assembly at any angle.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and more specifically, relates to a jaw locking mechanism and a stapler using the jaw locking mechanism. Background Technology

[0002] A stapler is a widely used medical device in surgery that uses titanium staples to cut or anastomose tissue. Its working principle is similar to that of a stapler, which fires and implants two rows of intersecting staples into the tissue for cross-suturing. Compared with traditional manual suturing, staplers are simple and convenient to operate, and greatly shorten the operation time.

[0003] To ensure precise gripping, cutting, and anastomosis of tissue by the jaw assembly at the end of the stapler, a locking mechanism can be used to control the rotation of the jaw assembly and its stable retention after rotation. However, most existing locking mechanisms employ stepped adjustment with adjustable positions, maintaining a locked position at a preset angle. Stepped adjustment is not conducive to the surgeon's adaptability to space, especially in complex surgical environments, where the surgeon needs to manually find the appropriate angle for the instrument based on the available angle settings. Additionally, some designs offer stepless adjustment, but such designs do not achieve stable locking in actual use, posing a risk of tissue damage during surgery.

[0004] In view of this, it is indeed necessary to propose improvements to the existing locking mechanism in order to solve the aforementioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a jaw locking mechanism that can achieve stable locking at any angle.

[0006] To achieve the above objectives, the present invention provides a jaw locking mechanism applied to the jaw assembly of a stapler, comprising:

[0007] The sleeve has a stop at one end near the jaw assembly;

[0008] The ejector seat is housed within the sleeve and disposed near the jaw assembly;

[0009] A pull rod is housed within the sleeve, and one end is connected to the pivot of the jaw assembly;

[0010] A locking block is housed within the ejector pin seat and located inside the pull rod;

[0011] A locking push rod, housed within the ejector pin seat, and at least partially located on the side of the locking block opposite to the pull rod; and

[0012] A locking spring is housed within the ejector pin seat and connected to the locking push rod.

[0013] When the jaw assembly is in the open state, the locking push rod and the stop are locked together; when the jaw assembly is in the closed state, the locking spring can actively / passively push the locking push rod toward the jaw assembly, so that the locking push rod, the locking block and the pull rod abut against each other and lock together.

[0014] Optionally, the pull rod has a first contact surface toward the locking block, the locking block has a second contact surface toward the pull rod and a third contact surface toward the locking push rod, and the locking push rod has a fourth contact surface toward the locking block. When the jaw assembly is in the closed state, the first contact surface is in close contact with the second contact surface, and the third contact surface is in close contact with the fourth contact surface.

[0015] Optionally, the first contact surface, the second contact surface, the third contact surface, and the fourth contact surface are all inclined surfaces.

[0016] Optionally, the locking push rod includes a body portion and an abutment block disposed perpendicular to the body portion. The body portion is housed within the ejector seat and engages with the locking block. The abutment block extends out of the ejector seat and abuts against the stop member when the jaw assembly is in the open state.

[0017] Optionally, one end of the locking spring abuts against the ejector pin seat and the other end abuts against the body portion. When the jaw assembly is in the open state, the locking spring is compressed.

[0018] Optionally, two of each of the pull rod, the locking block, the locking push rod, and the locking spring are provided and arranged symmetrically along the axial direction of the sleeve.

[0019] Optionally, the locking push rod includes a locking member, a slide rod extending from one end of the locking member, and a push block slidably disposed on the slide rod. The locking member is configured to abut against the locking block. The locking spring is sleeved on the slide rod, with one end abutting against the locking member and the other end abutting against the push block. The push block is engaged and fixed with a stop member on the sleeve.

[0020] Optionally, the push block has a snap-fit ​​groove on the side facing the sleeve, and the stop member is limited and accommodated in the snap-fit ​​groove. When the sleeve moves toward the jaw assembly, the stop member drives the push block to slide along the slide rod, so that the locking spring passively pushes the locking member toward the jaw assembly until the jaw assembly is in a closed state.

[0021] Optionally, two of each of the pull rod, the locking block, the locking member, the slide rod, and the locking spring are provided and arranged symmetrically along the axial direction of the sleeve. One push block is provided, and its two ends are respectively sleeved on the two slide rods.

[0022] Another objective of this invention is to provide a stapler that enables stable locking of the jaw assembly at any angle.

[0023] To achieve the above objectives, the present invention provides a stapler, including a jaw assembly and the aforementioned jaw locking mechanism, wherein the jaw assembly is connected to the pull rod shaft to rotate under the push of the pull rod.

[0024] The beneficial effects of this invention are as follows: The jaw locking mechanism of this invention, by setting a stop on the sleeve and simultaneously setting a pull rod, locking block, locking push rod, and locking spring in the ejector seat, allows the locking block to release the limit on the pull rod by the mutual locking of the locking push rod and the stop when the jaw assembly is in the open state, thus enabling stepless adjustment of the jaw assembly. After adjustment, the sleeve moves towards the jaw assembly, bringing the jaw assembly into the closed state. At this time, the locking spring can actively / passively push the locking push rod towards the jaw assembly, causing the locking push rod, locking block, and pull rod to abut and lock against each other, achieving stable locking of the jaw assembly at any angle. Attached Figure Description

[0025] Figure 1 This is a perspective view of the first embodiment of the stapler of the present invention.

[0026] Figure 2 yes Figure 1 A schematic diagram of the stapler from another angle.

[0027] Figure 3 yes Figure 1 The diagram shows the anastomosis device after some structures have been removed.

[0028] Figure 4 yes Figure 3 A diagram showing the combined state of the center pin seat, locking spring, locking push rod, and locking block.

[0029] Figure 5 yes Figure 3 Exploded view of the tie rod, locking block, locking push rod, and locking spring.

[0030] Figure 6 yes Figure 5 Another perspective diagram.

[0031] Figure 7 yes Figure 5 A 3D view of the locking push rod.

[0032] Figure 8 yes Figure 2 Partial exploded view of the middle jaw locking mechanism.

[0033] Figure 9 yes Figure 3 A schematic diagram of the middle jaw locking mechanism in a linear locking state.

[0034] Figure 10 yes Figure 9 The diagram shows the locked state of the jaw locking mechanism after the jaw assembly has been rotated to a certain angle.

[0035] Figure 11 This is a perspective view of a second embodiment of the stapler of the present invention.

[0036] Figure 12 yes Figure 11 A partial structural diagram of the middle jaw locking mechanism.

[0037] Figure 13 yes Figure 12 Another perspective diagram.

[0038] Figure 14 yes Figure 12 A schematic diagram of the middle jaw locking mechanism in a linear locking state.

[0039] Figure 15 yes Figure 14 The diagram shows the locked state of the jaw locking mechanism after the jaw assembly has been rotated to a certain angle. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] like Figure 1 As shown, this invention discloses a stapler 100, including a jaw locking mechanism 10, a jaw assembly 20, and a knob assembly 30. The jaw locking mechanism 10 is connected between the jaw assembly 20 and the knob assembly 30, allowing the jaw assembly 20 to swing left and right by operating the knob assembly 30, thus achieving steering. Simultaneously, the jaw locking mechanism 10 can also stably lock the jaw assembly 20 at any angle, unaffected by external resistance.

[0043] like Figures 2 to 5As shown, the jaw locking mechanism 10 includes a sleeve 11, a pin seat 12, a pull rod 13, a locking block 14, a locking push rod 15, and a locking spring 16. The sleeve 11 connects the jaw assembly 20 and the knob assembly 30, serving as a structural connection and support. The sleeve 11 can move back and forth towards the jaw assembly 20. When the sleeve 11 moves towards the jaw assembly 20, the jaw assembly 20 closes; when the sleeve 11 moves away from the jaw assembly 20 (i.e., towards the knob assembly 30), the jaw assembly 20 opens.

[0044] In this embodiment, two pull rods 13, two locking blocks 14, two locking push rods 15 and two locking springs 16 are provided and are arranged symmetrically along the axial direction of the sleeve 11. Thus, the jaw assembly 20 can be adjusted by independently controlling the two pull rods 13 using the knob assembly 30.

[0045] The ejector seat 12 is housed within the sleeve 11 and positioned near the jaw assembly 20. The pull rod 13 is also housed within the sleeve 11, with one end connected to the pivot of the jaw assembly 20 and the other end connected to the knob assembly 30. Operating the knob assembly 30 allows the pull rod 13 to move back and forth, thereby turning the jaw assembly 20. The locking block 14 is housed within the ejector seat 12 and located inside the pull rod 13. It can move laterally toward the pull rod 13 under the push of the locking push rod 15. The locking push rod 15 is housed within the ejector seat 12 and is at least partially located on the side of the locking block 14 opposite to the pull rod 13. The locking spring 16 is also housed within the ejector seat 12 and connected to the locking push rod 15.

[0046] A stop 111 is provided at the end of the sleeve 11 near the jaw assembly 20. When the jaw assembly 20 is in the open state, the locking push rod 15 and the stop 111 are locked together. At this time, the locking block 14 does not limit the pull rod 13, and the operator can adjust the direction of the jaw assembly 20. After the adjustment is completed, the sleeve 11 moves toward the jaw assembly 20, so that the jaw assembly 20 is in the closed state. At this time, the locking spring 16 actively pushes the locking push rod 15 toward the jaw assembly 20, so that the locking push rod 15, the locking block 14 and the pull rod 13 abut against each other and lock, so as to achieve stable locking of the jaw assembly 20 at any angle.

[0047] like Figure 5 and Figure 6As shown, the pull rod 13 has a first contact surface 131 facing the locking block 14, the locking block 14 has a second contact surface 141 facing the pull rod 13 and a third contact surface 142 facing the locking push rod 15, and the locking push rod 15 has a fourth contact surface 151 facing the locking block 14. When the jaw assembly 20 is in the closed state, the first contact surface 131 and the second contact surface 141 are tightly fitted together, and the third contact surface 142 and the fourth contact surface 151 are tightly fitted together. In this way, mutual contact and locking between the locking push rod 15, the locking block 14, and the pull rod 13 can be achieved.

[0048] Optionally, the first contact surface 131, the second contact surface 141, the third contact surface 142, and the fourth contact surface 151 are all inclined surfaces. In this embodiment, the first contact surface 131 and the second contact surface 141 have the same inclination angle, preferably 1.5°; the third contact surface 142 and the fourth contact surface 151 have the same inclination angle, preferably 5°. This allows for smooth cooperation between the locking push rod 15, the locking block 14, and the pull rod 13, facilitating the operator's adjustment of the jaw assembly 20, and also enables self-locking between the locking push rod 15, the locking block 14, and the pull rod 13.

[0049] Of course, the present invention does not impose specific numerical limits on the tilt angles of the first contact surface 131, the second contact surface 141, the third contact surface 142 and the fourth contact surface 151. This is because the specific angle design is related to the coefficient of friction between the materials used in the locking push rod 15, the locking block 14 and the pull rod 13. As long as the pressure angle between the locking push rod 15, the locking block 14 and the pull rod 13 is less than the friction angle, the self-locking between the locking push rod 15, the locking block 14 and the pull rod 13 can be achieved.

[0050] The term "self-locking" means that when the first contact surface 131 and the second contact surface 141 are tightly fitted together, and the third contact surface 142 and the fourth contact surface 151 are tightly fitted together, the pull rod 13, the locking block 14, and the locking push rod 15 are locked together. At this time, even if the jaw assembly 20 is passively subjected to external force and transmitted to the locking block 14 through the pull rod 13, the lateral force generated is very small because the inclination angle of the first contact surface 131, the second contact surface 141, the third contact surface 142, and the fourth contact surface 151 is very small. This force is insufficient to cause the locking spring 16 to retract. Therefore, the position of the jaw assembly 20 can be firmly maintained.

[0051] Combination Figure 7 and Figure 8As shown, in this embodiment, the locking push rod 15 includes a body portion 152 and an abutment block 153 disposed perpendicular to the body portion 152. The body portion 152 is housed within the ejector seat 12 and engages with the locking block 14. A fourth contact surface 151 is formed on the side of the body portion 152 facing the locking block 14. One end of the locking spring 16 abuts against the ejector seat 12, and the other end abuts against the body portion 152. The abutment block 153 extends out of the ejector seat 12 and abuts against the stop member 111 when the jaw assembly 20 is in the open state. A through hole 112 is provided on the side of the sleeve 11 near the jaw assembly 20. The stop member 111 is plate-shaped and disposed within the through hole 112, and is connected to the inner wall of the through hole 112. Optionally, the stop member 111 is integrally formed within the through hole 112, but this is not a limitation.

[0052] The ejector seat 12 has a slot 121 for accommodating the locking push rod 15. The abutment block 153 extends out of the ejector seat 12 from the slot 121 and can slide along the slot 121. Thus, when the sleeve 11 moves toward the knob assembly 30, the stop member 111 pushes the abutment block 153 to move synchronously along the slot 121 toward the knob assembly 30 until the jaw assembly 20 is fully open. At this time, the abutment block 153 is blocked by the stop member 111, the locking spring 16 is compressed, the locking block 14 is free, and the pull rod 13 can move back and forth under the control of the knob assembly 30 to adjust the direction of the jaw assembly 20.

[0053] After the jaw assembly 20 is adjusted, the control sleeve 11 moves toward the jaw assembly 20. At this time, the abutment block 153 is released from the restriction of the stop 111. The locking push rod 15 also moves toward the jaw assembly 20 under the action of the rebound force of the locking spring 16, and pushes the locking block 14 to move laterally until it is in contact with the pull rod 13. Until the pull rod 13, the locking block 14 and the locking push rod 15 are in a tight state, that is, the first contact surface 131 and the second contact surface 141 are in close contact, and the third contact surface 142 and the fourth contact surface 151 are in close contact. At this time, the pull rods 13 on both sides are in a locked state, and the jaw assembly 20 is in a closed state.

[0054] like Figure 9 The diagram shows the jaw locking mechanism 10 in a linear locking state. At this time, the jaw assembly 20 is in a linear state (i.e., no steering is required), and the pull rods 13, locking blocks 14, locking push rods 15, and locking springs 16 on both sides are symmetrically arranged.

[0055] like Figure 10The diagram shows the locked state of the jaw locking mechanism 10 after the jaw assembly 20 has been rotated to a certain angle. As can be seen from the diagram, the release amount of the locking spring 16 varies with different rotation angles, and these different release amounts cause the locking push rods 15 on both sides to move adaptively by different distances until they engage with the corresponding locking block 14 and pull rod 13.

[0056] Example 2

[0057] like Figures 11 to 15 The image shows a second embodiment of the stapler of the present invention. In this embodiment, the structure of the jaw locking mechanism 10' is basically the same as that of the jaw locking mechanism 10 in the first embodiment. The main difference lies in the structure of the locking push rod 15'. Therefore, the following description will mainly focus on the detailed description of the structure of the locking push rod 15', and other identical structures will not be described again.

[0058] The locking push rod 15' includes a locking member 154, a slide rod 155 extending from one end of the locking member 154, and a push block 156 slidably disposed on the slide rod 155. The locking member 154 is configured to abut against the locking block 14. A locking spring 16 is sleeved on the slide rod 155, with one end abutting against the locking member 154 and the other end abutting against the push block 156. The push block 156 is engaged and fixed with the stop member 111 on the sleeve 11.

[0059] Specifically, the push block 156 has a locking groove 157 on the side facing the sleeve 11, and the stop member 111 is contained within the locking groove 157. When the sleeve 11 moves toward the jaw assembly 20, the stop member 111 drives the push block 156 to slide along the slide rod 155, causing the locking spring 16 to passively push the locking member 154 toward the jaw assembly 20 until the jaw assembly 20 is in the closed state. Of course, when the jaw assembly 20 is in the open state, the stop member 111 is still contained within the locking groove 157. That is to say, in this embodiment, the stop member 111 is always contained within the locking groove 157 and does not change due to the opening or closing of the jaw assembly 20.

[0060] In this embodiment, two pull rods 13, two locking blocks 14, two locking members 154, two sliding rods 155, and two locking springs 16 are provided, and they are arranged symmetrically along the axial direction of the sleeve 11; one push block 156 is provided, and its two ends are respectively sleeved on the two sliding rods 155. Thus, when the sleeve 11 moves toward the knob assembly 30, the stop member 111 will drive the push block 156 to slide synchronously along the sliding rod 155 toward the knob assembly 30 until the jaw assembly 20 is in a fully open state. At this time, the locking spring 16 is stretched, the locking block 14 is in a free state, and the pull rod 13 can move back and forth under the control of the knob assembly 30 to realize the steering adjustment of the jaw assembly 20.

[0061] After the jaw assembly 20 is adjusted, the control sleeve 11 moves toward the jaw assembly 20. At this time, the stop 111 will drive the push block 156 to slide synchronously along the slide rod 155 toward the jaw assembly 20. The push block 156 squeezes the locking spring 16, causing the locking spring 16 to passively push the locking member 154 to move toward the jaw assembly 20. Then the locking member 154 pushes the locking block 14 to move laterally until it is in contact with the pull rod 13, until the pull rod 13, the locking block 14 and the locking member 154 are in a clamped state. At this time, the pull rods 13 on both sides are in a locked state and the jaw assembly 20 is in a closed state.

[0062] like Figure 14 The diagram shows the jaw locking mechanism 10' in a linear locking state. At this time, the jaw assembly 20 is in a linear state (i.e., no steering is required), and the pull rods 13, locking blocks 14, locking elements 154, slide rods 155, and locking springs 16 on both sides are symmetrically arranged.

[0063] like Figure 15 The diagram shows the locked state of the jaw locking mechanism 10' after the jaw assembly 20 has been rotated to a certain angle. As can be seen from the diagram, the forces on both ends of the push block 156 are different at different rotation angles, and the different forces will cause the locking members 154 on both sides to move adaptively by different distances until they are tightly engaged with the corresponding locking block 14 and pull rod 13.

[0064] As can be seen from the above description, the differences between Embodiment 1 and Embodiment 2 also include: in Embodiment 1, the power source for moving the locking push rod 15 is the locking spring 16; while in Embodiment 2, the power source for moving the locking push rod 15' is the sleeve 11.

[0065] In summary, the jaw locking mechanisms 10 and 10' of the present invention, by providing a stop 111 on the sleeve 11 and a pull rod 13, a locking block 14, locking push rods 15 and 15', and a locking spring 16 within the ejector seat 12, allow for stepless adjustment of the jaw assembly 20 when it is in the open state. This is achieved by using the mutual locking of the locking push rods 15 and 15' with the stop 111 to release the locking block 14's restriction on the pull rod 13. After adjustment, the sleeve 11 moves towards the jaw assembly 20, bringing it to the closed state. At this point, the locking spring 16 can actively / passively push the locking push rods 15 and 15' towards the jaw assembly 20, causing the locking push rods 15 and 15', the locking block 14, and the pull rod 13 to abut against each other and lock, thus achieving stable locking of the jaw assembly 20 at any angle.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A jaw locking mechanism, applied to the jaw assembly of a stapler, characterized in that, include: The sleeve has a stop at one end near the jaw assembly; The ejector seat is housed within the sleeve and disposed near the jaw assembly; A pull rod is housed within the sleeve, and one end is connected to the pivot of the jaw assembly; A locking block is housed within the ejector pin seat and located inside the pull rod; A locking push rod is housed within the ejector pin seat and is at least partially located on the side of the locking block opposite to the pull rod. as well as A locking spring is housed within the ejector pin seat and connected to the locking push rod. When the jaw assembly is in the open state, the locking push rod and the stop are locked together. When the jaw assembly is in the closed state, the locking spring can actively / passively push the locking push rod toward the jaw assembly, so that the locking push rod, the locking block, and the pull rod abut against each other and lock. The pull rod has a first contact surface toward the locking block, the locking block has a second contact surface toward the pull rod and a third contact surface toward the locking push rod, and the locking push rod has a fourth contact surface toward the locking block. The first, second, third, and fourth contact surfaces are all inclined surfaces. When the jaw assembly is in the closed state, the first and second contact surfaces are in close contact, and the third and fourth contact surfaces are in close contact.

2. The jaw locking mechanism according to claim 1, characterized in that: The locking push rod includes a body portion and an abutment block disposed perpendicular to the body portion. The body portion is housed within the ejector seat and engages with the locking block. The abutment block extends out of the ejector seat and abuts against the stop member when the jaw assembly is in the open state.

3. The jaw locking mechanism according to claim 2, characterized in that: One end of the locking spring abuts against the ejector pin seat, and the other end abuts against the main body. When the jaw assembly is in the open state, the locking spring is compressed.

4. The jaw locking mechanism according to claim 2, characterized in that: Two of each of the pull rod, the locking block, the locking push rod, and the locking spring are provided and are arranged symmetrically along the axial direction of the sleeve.

5. The jaw locking mechanism according to claim 1, characterized in that: The locking push rod includes a locking member, a slide rod extending from one end of the locking member, and a push block slidably disposed on the slide rod. The locking member is configured to abut against the locking block. The locking spring is sleeved on the slide rod, with one end abutting against the locking member and the other end abutting against the push block. The push block is engaged and fixed with a stop member on the sleeve.

6. The jaw locking mechanism according to claim 5, characterized in that: The push block has a snap-fit ​​groove on the side facing the sleeve, and the stop is contained in the snap-fit ​​groove. When the sleeve moves toward the jaw assembly, the stop drives the push block to slide along the slide rod, so that the locking spring passively pushes the locking member toward the jaw assembly until the jaw assembly is in the closed state.

7. The jaw locking mechanism according to claim 5, characterized in that: Two of each of the pull rod, the locking block, the locking member, the slide rod, and the locking spring are provided and are arranged symmetrically along the axial direction of the sleeve. One push block is provided, and its two ends are respectively sleeved on the two slide rods.

8. A stapler, characterized in that: The device includes a jaw assembly and a jaw locking mechanism as described in any one of claims 1-7, wherein the jaw assembly is connected to the pull rod shaft to be turned under the push of the pull rod.

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