Jaw locking mechanism and anastomat

Abstract

The invention provides a jaw locking mechanism and an anastomat. The jaw locking mechanism comprises a sleeve, a locking piece and a locking piece, and the end, close to the jaw assembly, of the sleeve is provided with the locking piece; the ejector pin seat is accommodated in the sleeve and is arranged close to the jaw assembly; the pull rod is contained in the sleeve, and one end of the pull rod is connected with the jaw assembly through a rotating shaft; the locking block is accommodated in the ejector pin seat and is positioned on the inner side of the pull rod; the locking push rod is contained in the ejector pin seat, and at least part of the locking push rod is located on the side, away from the pull rod, of the locking block; the locking spring is accommodated in the ejector pin seat and is connected with the locking push rod; when the jaw assembly is in an open state, the locking push rod and the stop piece are locked with each other; when the jaw assembly is in a closed state, the locking spring can actively / passively push the locking push rod to move towards the jaw assembly, so that the locking push rod, the locking block and the pull rod abut against one another and are locked. Compared with the prior art, the jaw locking mechanism can achieve stable locking of the jaw assembly at any angle.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and more particularly relates to a jaw locking mechanism and an anastomat applying the same. BACKGROUND

[0002] An anastomat is a kind of medical device widely used in surgical operations, which uses titanium nails to cut or anastomose tissues, and its working principle is similar to that of a stapler. Two rows of interlaced sutures are implanted into the tissues by being fired, so as to perform cross-stitching. Compared with traditional manual suture, the anastomat is simple and convenient to operate, and greatly shortens the operation time.

[0003] In order to enable the jaw assembly at the end of the anastomat to clamp, cut and anastomose the tissues more accurately, a locking mechanism can be used to control the turning of the jaw assembly and the stable holding after turning. However, most of the existing locking mechanisms are step-adjusted with stops, and are locked at preset angle positions. The step-adjusted with stops is not conducive to the adaptability of the space for the doctor to operate, especially in a complex surgical environment, the doctor needs to find the appropriate angle of the held instrument according to the existing angle stops. In addition, some designs are stepless, but such designs do not achieve stable locking in actual use, and there is a risk of causing damage to the tissues during the operation.

[0004] Therefore, it is necessary to improve the existing locking mechanism to solve the above technical problems. SUMMARY

[0005] The present application aims to provide a jaw locking mechanism which can achieve stable locking at any angle.

[0006] To achieve the above-mentioned purpose, the present application provides a jaw locking mechanism applied to a jaw assembly of an anastomat, comprising:

[0007] a sleeve, one end of which is provided with a stopper close to the jaw assembly;

[0008] a needle holder, which is accommodated in the sleeve and is arranged close to the jaw assembly;

[0009] a pull rod, which is accommodated in the sleeve and has one end connected with the rotating shaft of the jaw assembly;

[0010] a locking block, which is accommodated in the needle holder and is located on the inner side of the pull rod;

[0011] a locking push rod, which is accommodated in the needle holder and is located at least partially on the side of the locking block away from the pull rod; and

[0012] a locking spring, which is accommodated in the needle holder and is connected with the locking push rod.

[0013] When the jaw assembly is in the open state, the locking push rod is locked with the stopper; when the jaw assembly is in the closed state, the locking spring can actively / passively push the locking push rod to move towards the jaw assembly, so that the locking push rod, the locking block and the pull rod abut against each other and are locked.

[0014] Optionally, the pull rod has a first contact surface facing the locking block, the locking block has a second contact surface facing the pull rod and a third contact surface facing the locking push rod, and the locking push rod has a fourth contact surface facing the locking block; when the jaw assembly is in the closed state, the first contact surface is tightly fitted with the second contact surface, and the third contact surface is tightly fitted 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 comprises a body portion and an abutting block perpendicular to the body portion, the body portion is accommodated in the thimble and cooperates with the locking block, and the abutting block protrudes from the thimble and abuts against the stopper when the jaw assembly is in the open state.

[0017] Optionally, one end of the locking spring abuts against the thimble, 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, the pull rod, the locking block, the locking push rod and the locking spring are all provided with two and are symmetrically arranged along the axial direction of the sleeve.

[0019] Optionally, the locking push rod comprises a locking piece, a sliding rod extending from one end of the locking piece and a push block slidingly arranged on the sliding rod, the locking piece is configured to abut against the locking block, the locking spring is sleeved on the sliding rod, one end of the locking spring abuts against the locking piece, and the other end abuts against the push block, and the push block is clamped and fixed with the stopper on the sleeve.

[0020] Optionally, a clamping groove is arranged on the side of the push block facing the sleeve, the stopper is limitedly accommodated in the clamping groove, when the sleeve moves towards the side of the jaw assembly, the stopper drives the push block to slide along the sliding rod, so that the locking spring passively pushes the locking piece to move towards the jaw assembly until the jaw assembly is in the closed state.

[0021] Optionally, the pull rod, the locking block, the locking piece, the slide rod and the locking spring are provided with two, and are arranged symmetrically along the axial direction of the sleeve, and the push block is provided with one, and two ends thereof are respectively sleeved on the two slide rods.

[0022] The present application also aims to provide an anastomat capable of realizing stable locking of the jaw assembly at any angle.

[0023] To achieve the above-mentioned purpose, the present application provides an anastomat comprising a jaw assembly and the aforementioned jaw locking mechanism, wherein the jaw assembly is connected with the pull rod in a rotating shaft mode to rotate under the pushing of the pull rod.

[0024] The present application has the beneficial effect that the jaw locking mechanism of the present application is provided with a stopper on the sleeve, and a pull rod, a locking block, a locking push rod and a locking spring in the needle holder, so that when the jaw assembly is in an open state, the locking of the locking push rod and the stopper can be utilized to release the limiting of the locking block on the pull rod, so as to realize stepless adjustment of the jaw assembly. After the adjustment is completed, the sleeve moves towards the side of the jaw assembly, so that the jaw assembly is in a closed state, at this time, the locking push rod can be actively / passively pushed by the locking spring to move towards the side of the jaw assembly, so that the locking push rod, the locking block and the pull rod abut and lock each other, realizing stable locking of the jaw assembly at any angle. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a perspective view of the first embodiment of the anastomat of the present application.

[0026] Figure 2 is Figure 1 is another angle view of the anastomat shown in the figure.

[0027] Figure 3 is Figure 1 is a schematic view of the anastomat shown in the figure after removing part of the structure.

[0028] Figure 4 is Figure 3 is a combination state view of the needle holder, the locking spring, the locking push rod and the locking block in the figure.

[0029] Figure 5 is Figure 3 is an exploded view of the pull rod, the locking block, the locking push rod and the locking spring.

[0030] Figure 6 is Figure 5 is another angle view of the figure.

[0031] Figure 7 is Figure 5 is a perspective view of the locking push rod in the figure.

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

[0033] Figure 9 is Figure 3 Schematic view of the jaw locking mechanism in a straight locking state.

[0034] Figure 10 is Figure 9 Locking state diagram of the jaw locking mechanism after the jaw assembly is turned to a certain angle.

[0035] Figure 11 is Perspective view of a second embodiment of the anastomat.

[0036] Figure 12 is Figure 11 Partial structural schematic view of the jaw locking mechanism.

[0037] Figure 13 is Figure 12 Another angle schematic view.

[0038] Figure 14 is Figure 12 Schematic view of the jaw locking mechanism in a straight locking state.

[0039] Figure 15 is Figure 14 Locking state diagram of the jaw locking mechanism after the jaw assembly is turned to a certain angle. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described in detail below in combination with the drawings and specific embodiments.

[0041] Embodiment One

[0042] As shown in Figure 1 , the present application discloses an anastomat 100, which comprises a jaw locking mechanism 10, a jaw assembly 20 and a knob assembly 30, wherein the jaw locking mechanism 10 is connected between the jaw assembly 20 and the knob assembly 30, so that the jaw locking mechanism 10 can drive the jaw assembly 20 to swing left and right by operating the knob assembly 30, realizing turning. At the same time, the jaw locking mechanism 10 can also realize stable locking of the jaw assembly 20 at any angle, and will not be affected by external resistance.

[0043] As shown in Figures 2 to 5As shown, the jaw locking mechanism 10 comprises a sleeve 11, a thimble 12, a pull rod 13, a locking block 14, a locking push rod 15 and a locking spring 16. Among them, the sleeve 11 is connected between the jaw assembly 20 and the knob assembly 30, which plays a role of structural connection and support. Of course, the sleeve 11 of the present application can move back and forth towards the side of the jaw assembly 20, when the sleeve 11 moves towards the side of the jaw assembly 20, the jaw assembly 20 is closed; when the sleeve 11 moves away from the side of the jaw assembly 20 (i.e. towards the side of the knob assembly 30), the jaw assembly 20 is opened.

[0044] In this embodiment, the pull rod 13, the locking block 14, the locking push rod 15 and the locking spring 16 are all provided with two, and are symmetrically arranged along the axial direction of the sleeve 11, so that the independent control of the two pull rods 13 by the knob assembly 30 can be used to adjust the steering of the jaw assembly 20.

[0045] The thimble 12 is accommodated in the sleeve 11 and is arranged close to the jaw assembly 20. The pull rod 13 is accommodated in the sleeve 11, and one end is connected with the rotating shaft of the jaw assembly 20 and the other end is connected with the knob assembly 30, so that when the knob assembly 30 is operated, the pull rod 13 can be pushed to move back and forth, thereby driving the jaw assembly 20 to steer. The locking block 14 is accommodated in the thimble 12 and is located on the inner side of the pull rod 13, and can be laterally moved towards the side of the pull rod 13 under the pushing of the locking push rod 15. The locking push rod 15 is accommodated in the thimble 12 and at least part of it is located on the side of the locking block 14 away from the pull rod 13. The locking spring 16 is also accommodated in the thimble 12 and is connected with the locking push rod 15.

[0046] The end of the sleeve 11 close to the jaw assembly 20 is provided with a stopper 111. When the jaw assembly 20 is in the open state, the locking push rod 15 is locked with the stopper 111, at this time the locking block 14 does not limit the pull rod 13, and the operator can adjust the steering of the jaw assembly 20. After the adjustment is completed, the sleeve 11 moves towards the side of 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 to move towards the jaw assembly 20, so that the locking push rod 15, the locking block 14 and the pull rod 13 abut and lock each other, realizing the stable locking of the jaw assembly 20 at any angle.

[0047] As Figure 5 With 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, 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 in close contact, and the third contact surface 142 and the fourth contact surface 151 are in close contact. In this way, mutual abutment 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 inclination angles of the first contact surface 131 and the second contact surface 141 are the same and preferably 1.5°; the inclination angles of the third contact surface 142 and the fourth contact surface 151 are the same and preferably 5°. In this way, not only can the locking push rod 15, the locking block 14 and the pull rod 13 be smoothly matched to facilitate the operator to adjust the steering of the jaw assembly 20, but also the self-locking between the locking push rod 15, the locking block 14 and the pull rod 13 can be achieved.

[0049] Of course, the inclination angles of the first contact surface 131, the second contact surface 141, the third contact surface 142 and the fourth contact surface 151 are not limited to specific values, because the specific angle design is related to the friction coefficient between the materials used by 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 so-called "self-locking" means that when 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, the pull rod 13, the locking block 14 and the locking push rod 15 are in a locked state relative to each other. At this time, even if the jaw assembly 20 is passively subjected to an external force and transmits it to the locking block 14 through the pull rod 13, because the inclination angles of the first contact surface 131, the second contact surface 141, the third contact surface 142 and the fourth contact surface 151 are very small, the resulting lateral force is also very small, which is not enough to cause the locking spring 16 to retract. Therefore, the position of the jaw assembly 20 can be firmly maintained.

[0051] In combination with 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] When the jaw assembly 20 is turned to the adjustment completion, the control sleeve 11 moves towards one side of the jaw assembly 20, at this time, the stopper 111 drives the push block 156 to slide along the slide rod 155 towards one side of the jaw assembly 20 synchronously, the push block 156 extrudes the locking spring 16, so that the locking spring 16 passively pushes the locking piece 154 to move towards one side of the jaw assembly 20, then the locking piece 154 pushes the locking block 14 to move laterally to be attached to the pull rod 13, until the pull rod 13, the locking block 14 and the locking piece 154 are in the clamping state, at this time, the pull rods 13 on both sides are in the locking state, and the jaw assembly 20 is in the closed state.

[0062] As shown in FIG. 6, it is a schematic view of the jaw locking mechanism 10' in the straight locking state. At this time, the jaw assembly 20 is in the straight state (i.e. without turning), and the pull rods 13, the locking blocks 14, the locking pieces 154, the slide rods 155 and the locking springs 16 on both sides are symmetrically arranged. Figure 14 As shown in FIG. 7, it is a locking state diagram of the jaw locking mechanism 10' after the jaw assembly 20 is turned to a certain angle. As can be seen from the diagram, the forces on both ends of the push block 156 are different under different turning angles, and different forces make the locking pieces 154 on both sides adaptively move different distances until they are clamped with the corresponding locking blocks 14 and pull rods 13.

[0063] Figure 15 As shown in FIG. 7, it is a locking state diagram of the jaw locking mechanism 10' after the jaw assembly 20 is turned to a certain angle. As can be seen from the diagram, the forces on both ends of the push block 156 are different under different turning angles, and different forces make the locking pieces 154 on both sides adaptively move different distances until they are clamped with the corresponding locking blocks 14 and pull rods 13.

[0064] From the above description, it can be known that the difference between the first embodiment and the second embodiment also includes that in the first embodiment, the power source for moving the locking push rod 15 is the locking spring 16, while in the second embodiment, the power source for moving the locking push rod 15' is the control sleeve 11.

[0065] In summary, the jaw locking mechanism 10, 10' of the present application sets the stopper 111 on the control sleeve 11, and sets the pull rod 13, the locking block 14, the locking push rod 15, 15' and the locking spring 16 in the needle holder 12, so that when the jaw assembly 20 is in the open state, the locking of the locking push rod 15, 15' and the stopper 111 can be used to release the locking of the locking block 14 to the pull rod 13, so as to adjust the jaw assembly 20 steplessly. After the adjustment is completed, the control sleeve 11 moves towards one side of the jaw assembly 20, so that the jaw assembly 20 is in the closed state, at this time, the locking spring 16 can actively / passively push the locking push rod 15, 15' to move towards one side of the jaw assembly 20, so that the locking push rod 15, 15', the locking block 14 and the pull rod 13 are abutted and locked, and the stable locking of the jaw assembly 20 at any angle is realized.

[0066] ​The above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A jaw locking mechanism for use in a jaw assembly of a stapler, the jaw locking mechanism comprising: The utility model relates to a locking mechanism of a pincer assembly, comprising: a sleeve provided with a stopper near one end of the pincer assembly; a thimble housed in the sleeve and arranged near the pincer assembly; a pull rod housed in the sleeve and connected with the pincer assembly at one end; a locking block housed in the thimble and located on the inner side of the pull rod; a locking push rod housed in the thimble and located at least partially on the side of the locking block away from the pull rod; and a locking spring housed in the thimble and connected with the locking push rod; wherein, when the pincer assembly is in an open state, the locking push rod and the stopper are locked with each other; when the pincer assembly is in a closed state, the locking spring can actively / passively push the locking push rod to move towards the pincer assembly, so that the locking push rod, the locking block and the pull rod abut and lock with each other. The pull rod has a first contact surface towards the locking block, the locking block has a second contact surface towards the pull rod and a third contact surface towards the locking push rod, and the locking push rod has a fourth contact surface towards the locking block; when the pincer assembly is in a closed state, the first contact surface and the second contact surface are in close contact, and the third contact surface and the fourth contact surface are in close contact.

2. The jaw locking mechanism of claim 1, wherein: The first contact surface, the second contact surface, the third contact surface and the fourth contact surface are all inclined surfaces.

3. The jaw locking mechanism of claim 2, wherein: The locking push rod comprises a body part housed in the thimble and matched with the locking block, and an abutting block arranged perpendicularly to the body part and extending out of the thimble and abutting with the stopper when the pincer assembly is in an open state.

4. The jaw locking mechanism of claim 1, wherein: One end of the locking spring abuts with the thimble, and the other end abuts with the body part; when the pincer assembly is in an open state, the locking spring is compressed.

5. The jaw locking mechanism of claim 4, wherein: The pull rod, the locking block, the locking push rod and the locking spring are all arranged in two and symmetrically arranged along the axial direction of the sleeve.

6. The jaw locking mechanism of claim 4, wherein: The locking push rod comprises a locking piece, a sliding rod extending out of one end of the locking piece, and a push block slidingly arranged on the sliding rod; the locking piece is arranged to abut with the locking block; the locking spring is sleeved on the sliding rod, one end of which abuts with the locking piece, and the other end abuts with the push block; and the push block is clamped and fixed with the stopper on the sleeve.

7. The jaw locking mechanism of claim 1, wherein: The side of the push block facing the sleeve is provided with a clamping groove, and the stopper is limitedly housed in the clamping groove; when the sleeve moves towards the side of the pincer assembly, the stopper drives the push block to slide along the sliding rod, so that the locking spring passively pushes the locking piece to move towards the pincer assembly until the pincer assembly is in a closed state.

8. The jaw locking mechanism of claim 7, wherein: The pull rod, the locking block, the locking piece, the sliding rod and the locking spring are all arranged in two and symmetrically arranged along the axial direction of the sleeve, and the push block is arranged in one and has two ends sleeved on the two sliding rods respectively.

9. The jaw locking mechanism of claim 7, wherein: ​ 10. An anastomat characterized by: The jaw assembly is connected with the pull rod pivot shaft to turn under the pushing of the pull rod.

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