A self-resetting push-knot wire cutter
The push-knot suture cutter, with its automatic reset and guide groove design, solves the problems of laborious surgical operations and component wear in existing technologies, achieving efficient, stable, and safe suture cutting and push-knot operations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO MEDICAL CENT LIHUILI HOSPITACL
- Filing Date
- 2025-01-16
- Publication Date
- 2026-06-30
AI Technical Summary
Existing suture pusher and cutter require multiple, lengthy operations during surgery, resulting in significant energy expenditure for the user and easy wear and tear on components, affecting surgical efficiency and lifespan.
An automatically reset push-knot wire cutter was designed. Through the sliding connection between the inner core and the outer tube and the automatic reset function of the reset component, manual operation is reduced. Combined with the design of the guide groove group and the protrusion, the linearity and accuracy of the inner core movement are ensured. The separate structure of the inner and outer tubes provides protection, and the use of elastic elements achieves rapid reset.
It reduces hand fatigue, simplifies the operation process, improves surgical efficiency, extends the service life of the instrument, and maintains the performance stability and safety of the instrument.
Smart Images
Figure CN224421053U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of wire cutter technology and relates to a push-knot wire cutter with automatic reset capability. Background Technology
[0002] A suture pusher is a specially designed medical device primarily used in meniscus injury surgery. It functions after implantation (such as a suture anchor or other fixation device) is in place, ensuring a tight wound closure by pushing the suture knot and precisely trimming excess sutures, thus helping surgeons complete the procedure efficiently. This tool plays a crucial role in improving surgical efficiency, reducing surgical time, and promoting patient recovery.
[0003] For example, a utility model patent with application number CN201620672676.X provides a device for quickly pushing knots and cutting threads, including: a main body, one end of which is provided with a handle, a thread cutting tube is fixed to a thread cutting tube injection molded part by injection molding process and inserted into the handle, a pushing member is fixed to the thread cutting tube injection molded part by adhesive, one end of a pushing rod is fixed to a pushing rod injection molded part by injection molding process, and the other end passes through the thread cutting tube injection molded part and is inserted into the thread cutting tube, and the pushing rod injection molded part is fixed to the handle by a buckle.
[0004] In conclusion, although some existing technical solutions have solved the problem of trimming excess sutures after surgery, they require multiple long-term operations during the procedure, which consumes a lot of the user's energy and has considerable room for improvement. Summary of the Invention
[0005] The purpose of this utility model is to address the aforementioned problems existing in the prior art by proposing an automatically resetable push-knot wire cutter, comprising:
[0006] An outer tube is provided with a first channel, a second channel, and a wire groove. The first channel and the second channel are connected and run through the entire outer tube. The wire groove is provided on the circumferential surface of the outer tube. The first channel is connected to the outside through the wire groove. A first contact surface is provided between the first channel and the second channel. The inner diameter of the second channel is larger than the inner diameter of the first channel.
[0007] The inner core is provided with a wire cutter head and a second contact surface. The inner core is accommodated in the first channel and the second channel and is slidably connected to the outer tube. The wire cutter head is located at one end of the inner core accommodated in the first channel, and the second contact surface is accommodated in the second channel.
[0008] A reset element is accommodated in the second channel, with one end of the reset element contacting the first contact surface and the other end of the reset element contacting the second contact surface.
[0009] The aforementioned self-resetting push-knot wire cutter further includes a push-knot section located at one end of the first channel away from the second contact surface.
[0010] In the aforementioned self-resetting push-knot wire cutter, the inner core is further provided with a protruding part and a third contact surface, and the second channel is provided with a fourth contact surface. The reset member can push the third contact surface to contact the fourth contact surface, at which time the protruding part is located outside the outer tube.
[0011] In the aforementioned self-resetting push-knot wire cutter, the inner core is further provided with a guide groove group, and the second channel is provided with a guide block, which is accommodated in the guide groove group.
[0012] In the aforementioned self-resetting push-knot wire cutter, the inner core is further provided with an outer cylinder and an inner cylinder. The inner cylinder is connected to one end of the inner core. The outer cylinder is sleeved on the inner cylinder and is slidably and rotatably connected to the inner cylinder. The guide groove group includes a front guide groove and a rear guide groove. The front guide groove is provided in the inner cylinder, and the rear guide groove is provided in the outer cylinder.
[0013] In the above-mentioned automatically reset push-knot wire cutter, the inner cylinder is provided with a front toothed portion, the outer cylinder is provided with a rear toothed portion, the front toothed portion can mesh with the rear toothed portion, and the inner cylinder is provided with a first position and a second position.
[0014] When the inner cylinder is in the first position, the guide block is accommodated in the front guide groove and the rear guide groove. When the outer cylinder is pressed to push the inner cylinder to move, the guide block disengages from the front guide groove. At the same time, the reset member pushes the inner cylinder to move toward the outer cylinder, so that the front tooth and the rear tooth mesh, thereby causing the inner cylinder to rotate relative to the outer cylinder to the second position. At this time, the front guide groove and the rear guide groove are misaligned.
[0015] In the aforementioned self-resetting push-knot wire cutter, the reset element is configured as an elastic element.
[0016] In the aforementioned automatically reset push-knot wire cutter, the push-knot section is provided with an inclined portion.
[0017] In the aforementioned automatically reset push-knot wire cutter, a wire cutting section is provided at one end of the wire passage groove near the push-knot section.
[0018] In the aforementioned automatically reset push-knot wire cutter, the outer tube is further provided with an anti-slip part, which is located at one end of the outer tube away from the push-knot part.
[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0020] 1. Since the reset process is completed automatically by the reset component, the user does not need to apply extra force to reset the inner core, thereby reducing hand fatigue, which is especially important for surgical procedures that require long-term, delicate operations.
[0021] 2. The protrusion is located outside the outer tube, which facilitates the user's control of the inner core. The inner core can be pushed without inserting fingers into the outer tube to complete the cutting of the suture. This not only simplifies the operation process, but also reduces the inconvenience that may be caused by limited hand movements. Since it is not necessary to insert fingers into the instrument, the doctor's hand posture is more natural and less likely to feel fatigued during long-term use.
[0022] 3. As the inner core moves, the guide block on the second channel is always accommodated in the guide groove group on the inner core, which makes the movement of the inner core linear and accurate, and less prone to deviation. This reduces friction and wear between internal components, thus extending the service life of the pusher wire cutter and maintaining its long-term performance stability. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of this utility model.
[0024] Figure 2 for Figure 1 A magnified view of detail A.
[0025] Figure 3 This is a cross-sectional view of the present invention.
[0026] Figure 4 This is a cross-sectional view of the outer tube of this utility model.
[0027] Figure 5 This is a schematic diagram of the first position of the inner core of this utility model.
[0028] Figure 6 This is a schematic diagram of the second position of the inner core of this utility model.
[0029] In the picture:
[0030] 1. Outer tube; 11. First channel; 12. Second channel; 121. Fourth contact surface; 122. Guide block; 13. Wire groove; 131. Wire cutting part; 14. First contact surface; 15. Anti-slip part; 2. Inner core; 21. Wire cutting end; 22. Second contact surface; 23. Protrusion part; 24. Third contact surface; 25. Guide groove group; 251. Front guide groove; 252. Rear guide groove; 26. Outer cylinder; 261. Rear tooth part; 27. Inner cylinder; 271. Front tooth part; 3. Reset part; 4. Push joint part. Detailed Implementation
[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0033] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.
[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0036] The specific embodiments described herein are merely illustrative examples of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or adopt similar methods to replace them, but without departing from the patent of this utility model or exceeding the scope defined by the appended claims.
[0037] like Figures 1-6 As shown, an automatically resetting push-knot wire cutter includes: an outer tube 1, an inner core 2, and a resetting component 3.
[0038] The outer tube 1 is provided with a first channel 11, a second channel 12 and a wire groove 13. The first channel 11 and the second channel 12 are connected and pass through the entire outer tube 1. The wire groove 13 is provided on the circumference of the outer tube 1. The first channel 11 is connected to the outside through the wire groove 13. A first contact surface 14 is provided between the first channel 11 and the second channel 12. The inner diameter of the second channel 12 is larger than the inner diameter of the first channel 11.
[0039] The inner core 2 is provided with a wire cutter head 21 and a second contact surface 22. The inner core 2 is accommodated in the first channel 11 and the second channel 12, and is slidably connected to the outer tube 1. The wire cutter head 21 is located at one end of the inner core 2 that is accommodated in the first channel 11, and the second contact surface 22 is accommodated in the second channel 12.
[0040] The reset member 3 is housed in the second channel 12, and one end of the reset member 3 contacts the first contact surface 14, while the other end of the reset member 3 contacts the second contact surface 22.
[0041] Specifically, after the sewing is completed, the suture needs to be passed through the first channel 11 and out of the thread groove 13. At this time, push the inner core 2 so that the thread cutting end 21 of the inner core 2 passes through the thread groove 13, thereby cutting the suture. After the cutting is completed, simply release the hand, and the reset member 3 located in the second channel 12 can push the inner core 2 to reset.
[0042] In this embodiment, since the reset process is completed automatically under the action of the reset member 3, the user does not need to apply additional force to reset the inner core 2, thereby reducing hand fatigue, which is especially important for surgical procedures that require long-term, delicate operations.
[0043] like Figures 1-6 As shown, based on the above embodiment, it also includes a push-joint part 4, which is located at one end of the first channel 11 away from the second contact surface 22.
[0044] In this embodiment, after the sewing is completed, the thread passes through the first channel 11 and through the thread groove 13 while the push-knot thread cutter continues to advance. At this time, the push-knot part 4 can contact the knot and continue to advance, thereby making the knot tighter.
[0045] like Figures 1-6 As shown, based on the above embodiment, the inner core 2 is further provided with a protrusion 23 and a third contact surface 24, and the second channel 12 is provided with a fourth contact surface 121. The reset member 3 can push the third contact surface 24 to contact the fourth contact surface 121. At this time, the protrusion 23 is located outside the outer tube 1.
[0046] Specifically, the reset member 3 pushes the inner core 2 to move until the third contact surface 24 contacts the fourth contact surface 121, at which point the protrusion 23 is mostly located outside the outer tube 1.
[0047] In this embodiment, the protrusion 23 is located outside the outer tube 1, which facilitates the user's control of the inner core 2. The inner core 2 can be pushed without inserting fingers into the outer tube 1 to complete the cutting of the suture. This not only simplifies the operation process, but also reduces the inconvenience that may be caused by the restriction of hand movements. Since it is not necessary to insert fingers into the instrument, the doctor's hand posture is more natural and less likely to feel fatigued during long-term use.
[0048] like Figures 1-6 As shown, based on the above embodiment, the inner core 2 is further provided with a guide groove group 25, and the second channel 12 is provided with a guide block 122, which is accommodated in the guide groove group 25.
[0049] In this embodiment, since the guide block 122 on the second channel 12 is always accommodated in the guide groove group 25 on the inner core 2 when the inner core 2 moves, the movement of the inner core 2 is linear and accurate, and it is not easy to deviate, thereby reducing friction and wear between internal components. This can extend the service life of the pusher wire cutter and maintain its long-term performance stability.
[0050] like Figures 1-6 As shown, based on the above embodiment, the inner core 2 is further provided with an outer cylinder 26 and an inner cylinder 27. The inner cylinder 27 is connected to one end of the inner core 2. The outer cylinder 26 is sleeved on the inner cylinder 27 and is slidably and rotatably connected to the inner cylinder 27. The guide groove group 25 includes a front guide groove 251 and a rear guide groove 252. The front guide groove 251 is provided in the inner cylinder 27, and the rear guide groove 252 is provided in the outer cylinder 26.
[0051] In this embodiment, due to the separate design of the inner cylinder 27 and the outer cylinder 26, this structure provides an additional protection mechanism when the push-knot wire cutter is accidentally dropped. If the protrusion 23 hits the ground when the push-knot wire cutter is accidentally dropped, the resulting vibration will only have a greater impact on the outer cylinder 26, and will cause very little damage to the inner cylinder 27 connected to the inner core 2, thereby protecting the inner core 2.
[0052] like Figures 1-6 As shown, based on the above embodiment, the inner cylinder 27 is provided with a front toothed portion 271, the outer cylinder 26 is provided with a rear toothed portion 261, the front toothed portion 271 can mesh with the rear toothed portion 261, and the inner cylinder 27 is provided with a first position and a second position.
[0053] Specifically, when the inner cylinder 27 is in the first position, the guide block 122 is accommodated in the front guide groove 251 and the rear guide groove 252. When the outer cylinder 26 is pressed to push the inner cylinder 27 to move, the guide block 122 disengages from the front guide groove 251. At the same time, the reset member 3 pushes the inner cylinder 27 toward the outer cylinder 26, so that the front tooth 271 meshes with the rear tooth 261, thereby causing the inner cylinder 27 to rotate relative to the outer cylinder 26 to the second position. At this time, the front guide groove 251 and the rear guide groove 252 are misaligned.
[0054] In this embodiment, when the inner cylinder 27 is in the first position, the guide block 122 is simultaneously accommodated in the front guide groove 251 and the rear guide groove 252, so that the inner core 2 can move away from the push-joint part 4 under the action of the reset member 3, thereby achieving the purpose of reset. After the inner cylinder 27 reaches the second position, the front guide groove 251 and the rear guide groove 252 are no longer aligned, but misaligned. This misalignment design ensures the stability of the inner cylinder 27 in the second position and prevents the inner cylinder 27 from accidentally returning to the first position, providing efficient, accurate and safe operation for the cutting process.
[0055] like Figures 1-6 As shown, based on the above embodiment, the reset member 3 is configured as an elastic member.
[0056] In this embodiment, the rapid response characteristic of the elastic element allows the inner core 2 to reset in a very short time, which is very advantageous for continuous operation or situations requiring rapid tool switching.
[0057] like Figures 1-6 As shown, based on the above embodiment, the push-joint part 4 is provided with an inclined part (not shown in the figure).
[0058] In this embodiment, the push knot part 4 is provided with an inclined part facing the center of the first channel 11, so that when the push knot part 4 comes into contact with the knot part, it can naturally guide the knot to move towards the center of the first channel 11, ensuring that the knot is in the optimal position and preventing wear on the knot around the outer tube 1.
[0059] like Figures 1-6 As shown, based on the above embodiment, the wire groove 13 is provided with a wire cutting part 131 at one end near the push-joint part 4.
[0060] In this embodiment, a thread-cutting part 131 is provided at the thread groove 13, so that the thread-cutting head 21 on the inner core 2 can cooperate with it to cut the sewing thread more efficiently.
[0061] like Figures 1-6As shown, based on the above embodiment, the outer tube 1 is further provided with an anti-slip part 15, which is located at one end of the outer tube 1 away from the push-joint part 4.
[0062] In this embodiment, the anti-slip part 15 increases the friction between the hand and the instrument, maintaining good grip stability even when the hand sweats or comes into contact with a moist environment during surgery. This helps the doctor to control the instrument more firmly and reduces operational errors caused by slippage.
Claims
1. An automatically resettable knot pusher thread cutter, characterized by, include: An outer tube is provided with a first channel, a second channel, and a wire groove. The first channel and the second channel are connected and run through the entire outer tube. The wire groove is provided on the circumferential surface of the outer tube. The first channel is connected to the outside through the wire groove. A first contact surface is provided between the first channel and the second channel. The inner diameter of the second channel is larger than the inner diameter of the first channel. The inner core is provided with a wire cutter head and a second contact surface. The inner core is accommodated in the first channel and the second channel and is slidably connected to the outer tube. The wire cutter head is located at one end of the inner core accommodated in the first channel, and the second contact surface is accommodated in the second channel. A reset element is accommodated in the second channel, with one end of the reset element contacting the first contact surface and the other end of the reset element contacting the second contact surface.
2. A self-resetting knot pusher according to claim 1, wherein: It also includes a push-joint portion, which is located at one end of the first channel away from the second contact surface.
3. The automatically resettable push-knot wire cutter as described in claim 1, characterized in that: The inner core is also provided with a protrusion and a third contact surface, and the second channel is provided with a fourth contact surface. The reset member can push the third contact surface to contact the fourth contact surface, at which time the protrusion is located outside the outer tube.
4. The automatically resettable push-knot wire cutter as described in claim 3, characterized in that: The inner core is also provided with a guide groove group, and the second channel is provided with a guide block, which is accommodated in the guide groove group.
5. The automatically resettable push-knot wire cutter as described in claim 4, characterized in that: The inner core is further provided with an outer cylinder and an inner cylinder. The inner cylinder is connected to one end of the inner core. The outer cylinder is sleeved on the inner cylinder and is slidably and rotatably connected to the inner cylinder. The guide groove group includes a front guide groove and a rear guide groove. The front guide groove is provided in the inner cylinder and the rear guide groove is provided in the outer cylinder.
6. The automatically resettable push-knot wire cutter as described in claim 5, characterized in that: The inner cylinder is provided with a front toothed portion, and the outer cylinder is provided with a rear toothed portion. The front toothed portion can mesh with the rear toothed portion. The inner cylinder is provided with a first position and a second position. When the inner cylinder is in the first position, the guide block is accommodated in the front guide groove and the rear guide groove. When the outer cylinder is pressed to push the inner cylinder to move, the guide block disengages from the front guide groove. At the same time, the reset member pushes the inner cylinder to move toward the outer cylinder, so that the front tooth and the rear tooth mesh, thereby causing the inner cylinder to rotate relative to the outer cylinder to the second position. At this time, the front guide groove and the rear guide groove are misaligned.
7. The automatically resettable push-knot wire cutter as described in claim 1, characterized in that: The reset element is configured as an elastic element.
8. The automatically resettable push-knot wire cutter as described in claim 2, characterized in that: The push-joint part is provided with an inclined part.
9. The automatically resettable push-knot wire cutter as described in claim 2, characterized in that: A rope-cutting part is provided at one end of the wire-passing groove near the push-knot part.
10. The automatically resettable push-knot wire cutter as described in claim 2, characterized in that: The outer tube is also provided with an anti-slip part, which is located at one end of the outer tube away from the push-joint part.