Thread retraction device

Abstract

Thread retraction device, characterized in that it comprises: a first winding wheel (100), a second winding wheel (200) and a wheel holder (300) which is detachably connected to an endoscope handle 400, wherein the first winding wheel (100) and the second winding wheel (200) are spaced apart from each other, wherein the first winding wheel (100) and the second winding wheel (200) are each rotatably connected to the wheel holder (300).

Description

Cross-references to related applications

[0001] This application claims priority to Chinese Patent Application No. CN20232200881.9, filed on August 15, 2023, in the Chinese Patent Office, entitled “Thread Retracting Device,” and priority to Chinese Patent Application No. CN202311032056.0, filed on August 15, 2023, in the Chinese Patent Office, entitled “Clamping Mechanism and Thread Retracting Device,” the entire disclosure of which is incorporated herein by reference. Technical area

[0002] This disclosure relates to the technical field of medical suturing devices, in particular to a thread retraction device. Technical background

[0003] With reference to Fig. 10 and Fig. 11, the tension pulley 900 in the prior art is mounted on the operating handle of the thread cutting mechanism 800. When the tension pulley 900 is rotated to tighten the thread 700, the tensile force of the thread 700 forces the flexible thread cutting mechanism 800 to bend and move toward the proximal end. As a result, the distance between the tension pulley 900 and the clamping opening of the endoscope handle is shortened, making it difficult to control the length of the thread 700. Therefore, it becomes difficult to contract the wound edge. When two single-anchor mechanisms are used for tissue suturing, two threads are retracted by the same winding pulley. This makes it impossible to adjust the tightness or looseness for a single thread. It is difficult to ensure that the cutting position of the two threads is in the center of the suture site, which may cause technical problems such as suture site deviation.During the retraction and cutting of the suture, it is necessary that the suture cutting mechanism 800 remain stable relative to the endoscope handle; otherwise, the tension of the suture would be impaired. Furthermore, during the operation, the surgeon must hold the endoscope handle, while operations such as suture retraction and cutting still need to be performed. Since the endoscope handle in the prior art cannot attach other instruments, not only manual assistance from additional assistants but also multiple people working in one location are required. These operators can easily interfere with each other, thereby affecting the accuracy of the surgical operation. Subject of revelation

[0004] The purpose of the present disclosure is to provide a thread retraction device to alleviate the technical problem. That is, the retraction length of the thread is difficult to control, and the tension states of two threads during retraction cannot be adjusted separately.

[0005] In a first aspect, the thread retraction device provided in this disclosure comprises: a first winding wheel, a second winding wheel, and a wheel holder detachably connected to an endoscope handle, wherein the first winding wheel and the second winding wheel are arranged spaced from each other, and wherein the first winding wheel and the second winding wheel are each rotatably connected to the wheel holder.

[0006] In an optional embodiment, the first winding wheel and the second winding wheel each comprise a wheel body, a first wheel disc and a second wheel disc, wherein the wheel body, the first wheel disc and the second wheel disc are arranged coaxially to one another, and wherein the first wheel disc and the second wheel disc are spaced from one another, and wherein the first wheel disc and the second wheel disc are each connected to the wheel body, and wherein a winding groove is formed between the first wheel disc and the second wheel disc.

[0007] In an optional embodiment, a clamping groove is provided on the first winding wheel and / or the second winding wheel.

[0008] In an optional embodiment, the first winding wheel and / or the second winding wheel are provided with a plurality of limiting sections which are arranged at a distance around a wheel axis.

[0009] In an optional embodiment, an elastic limiting element is attached to the wheel support and is adapted to the limiting portion, wherein the elastic limiting element tends to remain fitted to the limiting portion.

[0010] In an optional embodiment, the elastic limiting element is supported on the first winding wheel and the second winding wheel, so that reverse rotation of the first winding wheel and the second winding wheel is prevented and the tension of the thread extending from the endoscope handle to the first winding wheel or the second winding wheel is maintained, and wherein the limiting section has a slope, and wherein, when the first winding wheel or the second winding wheel is rotated to retract and tension the thread, the slope presses the elastic limiting element to decouple the elastic limiting element from the limiting section, or wherein the elastic limiting element is oriented at an angle with respect to the circumference of the winding wheel, and wherein, when the first winding wheel or the second winding wheel is rotated to retract and tension the thread,the second winding wheel is rotated to retract and tension the thread, the limiting portion presses the elastic limiting element to slidably decouple the elastic limiting element from the limiting portion.

[0011] In an optional embodiment, an angle is formed between an axis of the first winding wheel and an axis of the second winding wheel, wherein the bisector of the angle between the axis of the first winding wheel and the axis of the second winding wheel intersects with an axis of the working channel of the endoscope handle.

[0012] In an optional embodiment, the wheel mount is provided with a strap that is tied around the endoscope handle.

[0013] In an optional embodiment, a first clamping arm and a second clamping arm are movably mounted on the wheel mount, wherein a clamping area is formed between the first clamping arm and the second clamping arm.

[0014] In an optional embodiment, the first clamping arm is provided with a first tooth portion, and the second clamping arm is provided with a second tooth portion adapted to the first tooth portion, wherein the first tooth portion fits the second tooth portion in a form-fitting manner, and wherein the clamping region is formed between the first tooth portion and the second tooth portion.

[0015] In an optional embodiment, one end of the first clamping arm and one end of the second clamping arm are each rotatably connected to the wheel mount, the other end of the first clamping arm being opposite the other end of the second clamping arm, thereby forming the clamping region.

[0016] In an optional embodiment, the wheel mount is elastic and urges the first clamping arm and the second clamping arm such that the first clamping arm and the second clamping arm tend to form an angle between the first clamping arm and the second clamping arm.

[0017] In an optional embodiment, in the unlocking state, an opening is formed on one side of the clamping area, wherein a part of a second surgical instrument to be clamped enters the clamping area through the opening in a first direction and presses the first clamping arm and the second clamping arm and synchronously switches them into a locking state so that the opening has a reduced degree of opening or is closed, and wherein the first clamping arm and the second clamping arm are synchronously switched to the unlocking state when the clamped part, the first clamping arm or the second clamping arm is operated in a direction opposite to the first direction to remove the clamped part through the opening.

[0018] In an optional embodiment, the first clamping arm is provided with a first limiting groove, and the second clamping arm is provided with a second limiting groove which is opposite to the first limiting groove, wherein the clamping region is formed between the first limiting groove and the second limiting groove, and wherein in the locking state the wheel holder urges the first clamping arm and the second clamping arm such that they are pivoted in the first direction, and wherein a second surgical instrument is clamped between the first limiting groove and the second limiting groove, and wherein in the unlocking state the wheel holder urges the first clamping arm and the second clamping arm such that they are pivoted in the second direction in order to expand the degree of opening of the clamping region between the first limiting groove and the second limiting groove.

[0019] In an optional embodiment, the wheel mount is provided with a locking structure, or the first clamping arm and / or the second clamping arm are provided with a locking structure, wherein the locking structure is used to prevent the first clamping arm and the second clamping arm from further pivoting in the first direction in the locked state.

[0020] In an optional embodiment, the wheel mount is further provided with a cross member provided with a follower groove, wherein the follower groove is designed to receive a second surgical instrument and / or to prevent further movement of a second surgical instrument in the first direction.

[0021] The disclosed embodiments bring the following advantageous effects: the wheel mount is detachably connected to the endoscope handle, and the first winding wheel and the second winding wheel are arranged at a distance from each other and are each rotatably connected to the wheel mount. The first winding wheel and the second winding wheel can retract and tighten the two threads separately, and the looseness or tightness of either thread can be individually adjusted, thereby preventing deviation in the cutting position of the two threads. In addition, the first winding wheel and the second winding wheel drive the thread to retract and tighten the thread. This does not cause the thread cutting mechanism to bend. This does not affect the control of the thread cutting mechanism, but facilitates control of the retraction length of the thread.

[0022] To make the above-mentioned objects, features, and advantages of this disclosure more apparent and understandable, the following description sets forth preferred embodiments. Furthermore, a detailed explanation is provided in combination with the accompanying drawings. Description of the drawings

[0023] To better illustrate the specific embodiments of this disclosure and the technical solutions in the prior art, the drawings required to describe the specific embodiments and the prior art are briefly presented below. Of course, the drawings in the following description represent some of the embodiments of the disclosure, and those skilled in the art can obtain further drawings without any creative effort based on these drawings. Fig. 1 is a schematic illustration of a suture retractor and an endoscope handle according to an embodiment of the present disclosure; Fig. 2 is a schematic diagram of a first winding wheel of the thread retraction device according to an embodiment of the present disclosure; Fig. 3 is a schematic diagram of a thread retraction device according to an embodiment of the present disclosure; Fig. 4 is a first schematic diagram of another thread retraction device according to an embodiment of the present disclosure; Fig. 5 is a second schematic diagram of the other thread retracting device according to an embodiment of the present disclosure; Fig. 6 is a third schematic diagram of the other thread retracting device according to an embodiment of the present disclosure; Fig. 7 is a schematic illustration of a suture retractor and an endoscope handle according to an embodiment of the present disclosure; Fig. 8 is a schematic illustration of a first clamping arm and a second clamping arm of a thread retraction device according to an embodiment of the present disclosure; Fig. 9 is a schematic diagram of an endoscope handle according to an embodiment of the present disclosure; Fig. 10 is a schematic diagram of an endoscope handle, a thread, a thread cutting mechanism, and a winding wheel in the prior art; Fig. 11 is a schematic diagram of another endoscope handle, another thread, another thread cutting mechanism, and another winding wheel in the prior art; Fig. 12 is a schematic illustration of a wheel mount and an elastic limiting member of a thread retraction device according to an embodiment of the present disclosure; and Fig. 13 is a schematic diagram of another first winding wheel in a yarn retracting device according to an embodiment of the present disclosure.

[0024] Reference numerals: 100-first winding wheel; 101-winding groove; 102-clamping groove; 103-limiting portion; 131-slope; 110-wheel body; 120-first wheel disc; 130-second wheel disc; 200-second winding wheel; 300-wheel bracket; 301-limiting groove; 302-convex edge portion; 303-recess; 304-locking structure; 310-first clamping arm; 311-first tooth portion; 312-first limiting groove; 320-second clamping arm; 321-second tooth portion; 322-second limiting groove; 330-cross member; 400-endoscope handle; 401-endoscope working channel; 410-projection; 500-elastic limiting element; 600-belt; 700-thread; 800-thread cutting mechanism; 810-outer tube; 900-tension pulley. Detailed description of the embodiments

[0025] The following provides a clear and complete description of the technical solutions of the present disclosure in conjunction with the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present disclosure, not all of them. Based on the embodiments disclosed in this disclosure, all other embodiments that a person skilled in the art can derive without creative effort fall within the scope of the present disclosure.

[0026] In describing the present disclosure, it should be noted that the orientation or positional relationship indicated by terms such as "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," "outside," or the like refers to the orientation or positional relationship illustrated in the figures. These directional terms are provided solely to facilitate the description of the disclosure; they do not indicate or imply that this device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the disclosure. Furthermore, terms such as "first," "second," and "third" are for descriptive purposes only and should not be construed as indicating or implying relative importance.The physical quantity in the formula, unless separately identified, is to be understood as the basic quantity of the basic unit of the International System of Units (SI) or as the derived quantity derived from the basic quantity by mathematical operations such as multiplication, division, differentiation or integration.

[0027] It should also be noted in the description of the disclosure that, unless expressly stated and defined otherwise, terms such as "arranged," "attached," "coupled," and "connected" are to be understood in a broad sense. This can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection via an intermediate medium, or an internal connection between both elements. The person skilled in the art will understand the specific meaning of the aforementioned terms in the context of the disclosure on a case-by-case basis.

[0028] As in Fig. 1, Fig. 3, Fig. 4 and Fig. As shown in Figure 7, a suture retraction device provided in the embodiment of the present disclosure includes a first winding wheel 100, a second winding wheel 200, and a wheel mount 300 detachably connected to an endoscope handle 400. The first winding wheel 100 and the second winding wheel 200 are spaced apart from each other, and the first winding wheel 100 and the second winding wheel 200 are each rotatably connected to the wheel mount 300.

[0029] During the thread retraction process, two threads 700 are wound onto the first winding wheel 100 and the second winding wheel 200, respectively. By rotating the first winding wheel 100 and the second winding wheel 200, the two threads 700 can be retracted and tightened separately. The first winding wheel 100 and the second winding wheel 200 can rotate independently of each other, thereby tightening or loosening one of the two threads 700 separately, thereby preventing deviation of the cutting position of the two threads 700. Furthermore, the wheel holder 300 can be attached to the endoscope handle 400 so that the distance from the working channel 401 of the endoscope handle 400 to the first winding wheel 100 and the second winding wheel 200 remains unchanged. This can prevent interference with other devices due to the thread retraction process and facilitate control of the retraction length of the thread 700.

[0030] The endoscope handle 400 serves as a first surgical instrument that clamps and secures a second surgical instrument through a clamping portion, thereby maintaining relative stability between the first and second surgical instruments. There is no need for the surgeon to separately hold and secure the second surgical instrument in their hand, and there is no need for the second surgical instrument to be positioned and secured with the assistance of another user, which can prevent the surgeon from being disturbed or multiple surgical instruments from interfering with each other.

[0031] Compared to the prior art, an outer tube 810 of a suture cutting mechanism 800 can be clamped in the clamping area between a first clamping arm 310 and a second clamping arm 320, so that the suture cutting mechanism 800 is held stable relative to the endoscope handle 400, thereby preventing deviation of the suture cutting mechanism 800 during the suture retraction process, making it easier for the surgeon to perform suture retraction and cutting with one hand. The clamping area can also be used to clamp other endoscopic surgical instruments, ensuring that the second surgical instrument remains held in a fixed position relative to the endoscope handle 400, thereby reducing the difficulty of the operation for the surgeon.

[0032] As in Fig. 1 and Fig. 2, in the embodiment of the present disclosure, the first winding wheel 100 and the second winding wheel 200 each include a wheel body 110, a first wheel disc 120, and a second wheel disc 130. The wheel body 110, the first wheel disc 120, and the second wheel disc 130 are arranged coaxially with each other. The first wheel disc 120 and the second wheel disc 130 are arranged spaced apart from each other. The first wheel disc 120 and the second wheel disc 130 are each connected to the wheel body 110, and a winding groove 101 is formed between the first wheel disc 120 and the second wheel disc 130.

[0033] During the thread retraction process, a guide is used to guide the thread 700 out of the working channel 401, and the thread 700 is wound onto the wheel body 110. The thread 700 can be restricted by the first wheel disc 120 and the second wheel disc 130 in the winding groove 101, thereby preventing the thread 700 from detaching from the wheel body 110. By rotating the first winding wheel 100 and the second winding wheel 200, the length of the thread 700 wound onto the first winding wheel 100 and the second winding wheel 200 can be separately controlled, thereby enabling adjustment of the retracted length of the thread.

[0034] Furthermore, a clamping groove 102 is provided on the first winding wheel 100 and / or the second winding wheel 200.

[0035] In optional embodiments, the clamping groove 102 is provided either on the first winding wheel 100, or the clamping groove 102 is provided on the second winding wheel 200, or both the first winding wheel 100 and the second winding wheel 200 are provided with a clamping groove 102. The end of the thread 700 is guided through the clamping groove 102, and the thread 700 is thus clamped by the clamping groove 102 to prevent loosening or detachment of the thread 700.

[0036] As in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 12 and Fig. 13, the first winding wheel 100 and / or the second winding wheel 200 are provided with a plurality of limiting sections 103 which are arranged at a distance around the wheel axis.

[0037] In optional embodiments, the plurality of limiting sections 103 are provided either on the first winding wheel 100 or on the second winding wheel 200, or a plurality of limiting sections 103 are provided on both the first winding wheel 100 and the second winding wheel 200. The limiting sections 103 are designed as teeth or locking grooves, and the plurality of limiting sections 103 form a knurled structure on the outer surface of the first winding wheel 100 and the second winding wheel 200, whereby the frictional force when the first winding wheel 100 and the second winding wheel 200 touch can be increased and slipping can be prevented when the first winding wheel 100 and the second winding wheel 200 are manually operated.

[0038] Furthermore, an elastic limiting member 500 is attached to the wheel support 300, which is fitted to the limiting portion 103, and the elastic limiting member 500 tends to remain fitted to the limiting portion 103. The elastic limiting member 500, in the retracted state, presses against one of the limiting portions 103, thereby locking the first winding wheel 100 and the second winding wheel 200, thereby achieving a locking of the retracted amount of the thread 700.

[0039] In this embodiment, the elastic limiting element 500 rests against the first winding wheel 100 and the second winding wheel 200 to prevent the first winding wheel 100 and the second winding wheel 200 from rotating backward. This maintains tension on the thread 700 extending from the endoscope handle 400 to the first winding wheel 100 and the second winding wheel 200, respectively.

[0040] With reference to Fig. 1, Fig. 2 and Fig. 3, the limiting section 103 has a slope 131. When the first winding wheel 100 or the second winding wheel 200 is rotated to retract and tension the thread 700, the slope 131 presses the elastic limiting element 500 to decouple it from the limiting section 103. Alternatively, with reference to Fig. 7, Fig. 12 and Fig. 13, the elastic limiting element 500 is oriented at an angle relative to the circumference of the winding wheel. When the first winding wheel 100 or the second winding wheel 200 is rotated to retract and tension the thread 700, the limiting section 103 presses the elastic limiting element 500 to slidably decouple the elastic limiting element 500 from the limiting section 103.

[0041] As in Fig. 1, Fig. 2 and Fig. As shown in Figure 3, when the first winding wheel 100 and the second winding wheel 200 rotate, an external force forces the elastic limiting element 500 through the slope 131, allowing the end of the elastic limiting element 500 to decouple from the limiting element 103. This allows further rotation of the first winding wheel 100 and the second winding wheel 200, thereby retracting the thread 700 for tensioning. If the retraction state of the two threads 700 should be adjusted again, the elastic limiting element 500 can be manually operated to deactivate the locking of the first winding wheel 100 and the second winding wheel 200. Under the tension of the thread 700, the first winding wheel 100 and the second winding wheel 200 each rotate back, and the elastic limiting element 500 is subsequently released.When the first winding wheel 100 and the second winding wheel 200 are each rotated again, the two threads 700 can be retracted again so that the threads can be wound up again when the cutting position of the two threads 700 deviates.

[0042] Referred to Fig. 12 and Fig. 13 and in optional embodiments, the elastic limiting element 500 is formed as a leaf spring attached to the wheel mount 300, and the limiting portions 103 are formed as a plurality of projections or grooves spaced apart along the circumferential direction of the winding wheel. The leaf spring is inclined along the circumferential direction of the winding wheel, and the end of the leaf spring rests against the limiting portion 103. This enables unidirectional locking of the winding wheel.

[0043] As in Fig. 1, Fig. 2 and Fig. As shown in Figure 3, an angle is formed between the axis of the first winding wheel 100 and the axis of the second winding wheel 200. The bisector of the angle between the axis of the first winding wheel 100 and the axis of the second winding wheel 200 intersects the axis of the working channel 401 of the endoscope handle 400.

[0044] Specifically, the two threads 700 extending from the working channel 401 extend to the first winding wheel 100 and the second winding wheel 200, respectively. The two threads 700 face the two winding grooves 101, thereby preventing the first wheel disc 120 and the second wheel disc from touching the threads 700. This allows the two threads 700 to be wound smoothly onto the first winding wheel 100 and the second winding wheel 200, respectively.

[0045] As in Fig. 1 and Fig. As shown in Figure 3, the wheel mount 300 is provided with a strap 600 that is tied around the endoscope handle 400. The strap 600 can be connected to the endoscope handle 400 by means of a snap connection. Alternatively, the strap 600 is provided with a hook-and-loop fastener. The strap 600 is secured by the hook-and-loop fastener after the strap 600 has been connected to the wheel mount 300 and wrapped around the endoscope handle 400.

[0046] Furthermore, the strap 600 can be made of an elastic material. The wheel mount 300 is secured by the tied strap 600. The strap 600 tends to shrink, so that the wheel mount 300 can remain stable relative to the endoscope handle 400.

[0047] As in Fig. 1, Fig. 3, Fig. 4, Fig. 7 and Fig. As shown in Figure 9, the wheel mount 300 is provided with a limiting groove 301, and the endoscope handle 400 is provided with a protrusion 410 that can be inserted into the limiting groove 301. The working channel 401 extends through the protrusion 410, and the protrusion 410 is positively fitted in the limiting groove 301, so that the positioning of the wheel mount 300 relative to the endoscope handle 400 can be achieved when attaching the wheel mount 300.

[0048] As in Fig. 6 and Fig. 9, the wheel mount 300 is further provided with a convex edge portion 302 which abuts against the top of the elevation 410, wherein the axis of the working channel 401 is perpendicular to the top of the elevation 410 and the convex edge portion 302 abuts against the top of the elevation 410, so that the wheel mount 300 can be positioned in the axial direction of the working channel 401 relative to the elevation 410, thereby ensuring a secured position of the wheel mount 300.

[0049] As in Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. As shown in Figure 8, a first clamp arm 310 and a second clamp arm 320 are movably mounted on the wheel mount 300. A clamping portion is formed between the first clamp arm 310 and the second clamp arm 320, which can clamp the outer tube of the thread cutting mechanism, thereby ensuring that the thread cutting mechanism remains stationary during the thread retraction process to the wheel mount 300.

[0050] Specifically, the first clamping arm 310 and the second clamping arm 320 can each be formed as an elastic element, whereby the clamping in the clamping area can be carried out elastically. Furthermore, the first clamping arm 310 and the second clamping arm 320 can be connected by a sliding joint or a pivot joint on the wheel mount 300. If the first clamping arm 310 and the second clamping arm 320 are connected by a sliding joint, they can be driven in combination with an elastic limiting element to clamp the outer tube of the thread cutting mechanism between the first clamping arm 310 and the second clamping arm 320. If the first clamping arm 310 and the second clamping arm 320 are connected by a pivot joint on the wheel mount 300, two shaft receptacles can be provided on the wheel mount 300.The first clamp arm 310 and the second clamp arm 320 are each provided with a pivot shaft portion, and the two pivot shaft portions are each fitted into the two shaft receptacles. On a sectional plane perpendicular to the axis of the pivot shaft, the pitch angle corresponding to the shaft receptacle is greater than 180 degrees, so that the pivot shaft portion can be restricted to the shaft receptacle, and the first clamp arm 310 and the second clamp arm 320 can each pivot within a certain angular range.

[0051] Furthermore, the first clamping arm 310 is provided with a first limiting groove 312 and the second clamping arm 320 is provided with a second limiting groove 322 which is opposite the first limiting groove 312.

[0052] By driving action of an elastic structure, the first clamp arm 310 and the second clamp arm 320 are returned to the locking position, or the first clamp arm 310 and the second clamp arm 320 may self-lock, so that the first clamp arm 310 and the second clamp arm 320 tend to remain in a positive engagement with each other, and the outer tube 810 of the thread cutting mechanism 800 is clamped between the first limiting groove 312 and the second limiting groove 322, thereby ensuring that the thread cutting mechanism 800 remains stable relative to the wheel bracket 300.

[0053] The first clamping arm 310 and the second clamping arm 320 can be unlocked by manual operation. In the unlocked state, the first clamping arm 310 and the opposite second clamping arm 320 open. In other words, the opening of the clamping area between the first clamping arm 310 and the second clamping arm 320 increases to expand the opening degree between the first limiting groove 312 and the second limiting groove 322. At this time, the outer tube 810 can be inserted or withdrawn.

[0054] As in Fig. 5, the wheel mount 300 may further be provided with a cross member 330 having a recess 303 for receiving the second surgical instrument. Alternatively, the recess 303 is configured to prevent the second surgical instrument from moving further in a first direction. In optional embodiments, the recess 303 may also receive the second surgical instrument and, through the bottom or side wall, prevent the second surgical instrument from moving further in the first direction. The recess 303 preferably faces directly toward the clamping area, and the axis of the recess 303 is located between the first clamping arm 310 and the second clamping arm 320.When the first clamp arm 310 and the second clamp arm 320 clamp the second surgical instrument (the outer tube of the suture cutting mechanism), the side wall of the second surgical instrument (the outer tube of the suture cutting mechanism) abuts the cross member 330. The first clamp arm 310 and the second clamp arm 320 jointly clamp the outer tube, and the outer tube is maintained in a state of abutment against the cross member 330, thereby holding the first clamp arm 310 and the second clamp arm 320 at this dead center position, thereby maintaining the state of clamping and securing the outer tube.When it is necessary to deactivate the clamp, an external force is applied to pivot the first clamp arm 310 and the second clamp arm 320, thereby unlocking and opening the clamping area between the first clamp arm 310 and the second clamp arm 320, thereby releasing the outer tube of the suture cutting mechanism. The second surgical instrument extends through the recess 303 and into the working channel, which both makes the structure more compact and prevents bending of the second surgical instrument, thereby making the operation of the suture pulling during the cutting process even smoother. The second surgical instrument can be the suture cutting mechanism 800 or another endoscopic surgical instrument. Preferably, the first limiting groove 312, the second limiting groove 322, and the recess 303 are positively adapted to the clamped part of the clamped instrument.

[0055] As in Fig. 6 and Fig. 8, the first clamp arm 310 is provided with a first tooth portion 311, and the second clamp arm 320 is provided with a second tooth portion 321 adapted to the first tooth portion 311, wherein the first tooth portion 311 fits positively with the second tooth portion 321. The clamping area is formed between the first tooth portion 311 and the second tooth portion 321, whereby the first clamp arm 310 is precisely engaged with the second clamp arm 320. This prevents relative loosening between the first clamp arm 310 and the second clamp arm 320, and the first clamp arm 310 and the second clamp arm 320 can be better maintained in the locked state at the dead center. The stability of the clamped outer tube 810 is also improved.

[0056] As in Fig. 4, Fig. 5 and Fig. 6, in optional embodiments, one end of the first clamp arm 310 and one end of the second clamp arm 320 are each rotatably connected to the wheel mount 300, and the other end of the first clamp arm 310 is opposed to the other end of the second clamp arm 320, thereby forming a clamping portion. The wheel mount 300 is elastic and urges the first clamp arm 310 and the second clamp arm 320 such that the first clamp arm 310 and the second clamp arm 320 tend to form an angle therebetween. A shaft receiver is provided on the wheel mount 300. The first clamp arm 310 and the second clamp arm 320 are each provided with a pivot shaft portion, and the two pivot shaft portions are respectively fitted into the two shaft receivers.On a sectional plane perpendicular to the axis of the pivot shaft, the pitch angle to which the shaft receptacle corresponds is greater than 180 degrees, so that the pivot shaft portion can be restricted in the shaft receptacle, and the first clamp arm 310 and the second clamp arm 320 can each pivot within a certain angular range. In a state in which the first clamp arm 310 and the second clamp arm 320 are aligned straight with each other, both the first clamp arm 310 and the second clamp arm 320 are pressed by the wheel mount 300, thereby reducing the distance between the two pivot shaft portions to form an angle between the first clamp arm 310 and the second clamp arm 320. This creates a shear structure in the clamping area, so that the clamping and release of the outer tube 810 can occur.

[0057] Note that the distance between the two shaft supports is considered a first rod length, the length of the first clamp arm 310 is considered a second rod length, and the length of the second clamp arm 320 is considered a third rod length. The first rod length is less than the sum of the second rod length and the third rod length. Therefore, the wheel support 300, the first clamp arm 310, and the second clamp arm 320 together form a three-rod mechanism with a dead center. The wheel support 300, the first clamp arm 310, or the second clamp arm 320 undergoes elastic deformation, so that temporary collinearity of the first rod length, the second rod length, and the third rod length is achieved.After this compensation is canceled, the first clamp arm 310 and the second clamp arm 320 pivot about the pivot shaft relative to the wheel bracket 300 and form an angle between the first clamp arm 310 and the second clamp arm 320. In this state, a locked state or an unlocked state can be achieved.

[0058] In the unlocked state, an opening is formed on one side of the clamping area. The clamped part of a second surgical instrument enters the clamping area through the opening in a first direction and pushes the first clamping arm 310 and the second clamping arm 320, synchronously switching them to the locked state. As a result, the opening has a reduced degree of opening or is closed. When the clamped part, the first clamping arm 310, or the second clamping arm 320 is operated in the direction opposite to the first direction, the first clamping arm 310 and the second clamping arm 320 synchronously switch to the unlocked state to remove the clamped part through the opening. When locking is required, the clamped part is inserted through the opening into the clamping area and moved and pushed to bring the first clamping arm 310 and the second clamping arm 320 into the locked state.When unlocking, the clamped part of the second surgical instrument is simply lifted or the first clamp arm 310 and the second clamp arm 320 are moved in opposite directions, so that the first clamp arm 310 and the second clamp arm 320 are pivoted in opposite directions to bring them into the unlocked state. The operation is simple and can be operated with one hand, eliminating the need to change the hand position, making the operation more convenient.

[0059] With reference to Fig. 7 shows an example in which a suture cutting mechanism 800 is selected as the second surgical instrument. The outer tube 810 is coaxial with the working channel 401 of the endoscope handle 400 in the locked state, thus preventing bending of the outer tube 810. This allows the suture to be retracted smoothly within the outer tube 810.

[0060] As in Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. As shown in Figure 8, the first clamping arm 310 is provided with a first limiting groove 312, and the second clamping arm 320 is provided with a second limiting groove 322 opposite the first limiting groove 312. A clamping area is formed between the first limiting groove 312 and the second limiting groove 322. In the locked state, the wheel support 300 presses the first clamping arm 310 and the second clamping arm 320 such that they are pivoted in the first direction, as shown in Fig. 8. The outer tube 810 (the clamped part) of the thread cutting mechanism 800 (second surgical instrument) is clamped between the first limiting groove 312 and the second limiting groove 322. In the unlocked state, the wheel holder 300 presses the first clamping arm 310 and the second clamping arm 320 such that they are pivoted in a second direction, such as the direction shown in Fig. 8 to expand the clamping opening between the first limiting groove 312 and the second limiting groove 322. When the first clamping arm 310 and the second clamping arm 320 are aligned with each other, the first clamping arm 310 and the second clamping arm 320 reach the balancing point. The operator can interrupt this balancing with one hand and thereby pivot the first clamping arm 310 and the second clamping arm 320 synchronously, thereby enabling locking and unlocking.

[0061] In optional embodiments, the first clamping arm 310 and the second clamping arm 320 reach the dead center when the first limiting groove 312 and the second limiting groove 322 are joined and coaxial. Beyond the dead center in the a-direction, the first clamping arm 310 and the second clamping arm 320 are limited by the locking structure 304, and the outer tube 810 (the clamped part) of the suture cutting mechanism 800 (second surgical instrument) is clamped between the first limiting groove 312 and the second limiting groove 322.

[0062] As in Fig.6, in optional embodiments, the wheel mount 300 is provided with a locking structure 304, or the first clamping arm 310 and / or the second clamping arm 320 are provided with a locking structure 304. The locking structure 304 serves to prevent the first clamping arm 310 and the second clamping arm 320 from continuing to pivot in the first direction in the locked state.

[0063] When the wheel support 300 is provided with the locking structure 304, in the locked state, at least one of the first clamping arm 310 and the second clamping arm 320 can abut the locking structure 304 to limit a limit point where the first clamping arm 310 and the second clamping arm 320 pivot to the maximum in the first direction. On the one hand, excessive pivoting of the first clamping arm 310 and the second clamping arm 320 can be avoided, and on the other hand, damage to the outer tube 810 between the first limiting groove 312 and the second limiting groove 322 due to excessive clamping and compression can be prevented.

[0064] If the first clamping arm 310 or the second clamping arm 320 is provided with a locking structure 304, or if both the first clamping arm 310 and the second clamping arm 320 are provided with a locking structure 304, in the locked state the locking structure 304 limits the first clamping arm 310 and the second clamping arm 320 to one another, thereby limiting the limit point at which the first clamping arm 310 and the second clamping arm 320 pivot to the maximum in the first direction.

[0065] Finally, it should be noted that the above embodiments are used only to illustrate the technical solutions disclosed herein and not to limit them. Although detailed explanations for the present disclosure have been provided with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions recorded in the aforementioned embodiments or equivalently replace some or all of their technical features. These modifications or replacements do not deviate the essence of the respective technical solutions from the scope of the technical solutions of the various embodiments disclosed in this present disclosure. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 20232200881.9

[0001] CN 202311032056.0

[0001]

Claims

[1] Thread retraction device, characterized by in that it comprises: a first winding wheel (100), a second winding wheel (200) and a wheel holder (300) which is detachably connected to an endoscope handle 400, wherein the first winding wheel (100) and the second winding wheel (200) are arranged at a distance from one another, wherein the first winding wheel (100) and the second winding wheel (200) are each rotatably connected to the wheel holder (300). [2] Thread retraction device according to claim 1, characterized by that the first winding wheel (100) and the second winding wheel (200) each comprise a wheel body (110), a first wheel disc (120) and a second wheel disc (130), wherein the wheel body (110), the first wheel disc (120) and the second wheel disc (130) are arranged coaxially to one another, and wherein the first wheel disc (120) and the second wheel disc (130) are spaced apart from one another, and wherein the first wheel disc (120) and the second wheel disc (130) are each connected to the wheel body (110), and wherein a winding groove (101) is formed between the first wheel disc (120) and the second wheel disc (130). [3] Thread retraction device according to claim 2, characterized by that a clamping groove (102) is provided on the first winding wheel (100) and / or the second winding wheel (200). [4] Thread retraction device according to claim 2, characterized by that the first winding wheel (100) and / or the second winding wheel (200) are provided with a plurality of limiting sections (103) which are arranged at a distance around a wheel axis. [5] Thread retraction device according to claim 4, characterized bythat an elastic limiting element (500) is attached to the wheel support (300), wherein the elastic limiting element (500) is adapted to the limiting portion (103), and wherein the elastic limiting element (500) tends to remain fitted to the limiting portion 103. [6] Thread retraction device according to claim 5, characterized by that the elastic limiting element (500) is supported on the first winding wheel (100) and the second winding wheel (200), so that a rotation of the first winding wheel 100 and the second winding wheel (200) backwards is prevented and the thread (700) remains taut, which extends from the endoscope handle (400) to the first winding wheel (100) or the second winding wheel (200), and wherein the limiting section (103) has a slope (131), and wherein, when the first winding wheel (100) or the second winding wheel (200) is rotated to retract and tension the thread 700, the slope (131) presses the elastic limiting element (500) to decouple the elastic limiting element (500) from the limiting section (103), or wherein the elastic limiting element (500) is oriented inclined with respect to the circumference of the winding wheel, and wherein, when the first winding wheel (100) or the second winding wheel (200) is rotated to retract and tension the thread 700, the limiting section (103) presses the elastic limiting element (500) to slidably decouple the elastic limiting element (500) from the limiting section (103). [7] Thread retraction device according to claim 1, characterized bythat an angle is formed between an axis of the first winding wheel (100) and an axis of the second winding wheel (200), wherein the bisector of the angle between the axis of the first winding wheel (100) and the axis of the second winding wheel (200) intersects with an axis of the working channel (401) of the endoscope handle (400). [8] Thread retraction device according to claim 1, characterized by that the wheel holder (300) is provided with a strap (600) which is tied around the endoscope handle (400). [9] Thread retraction device according to claim 1, characterized by that a first clamping arm (310) and a second clamping arm (320) are movably mounted on the wheel holder (300), wherein a clamping area is formed between the first clamping arm (310) and the second clamping arm (320). [10] Thread retraction device according to claim 9, characterized byin that the first clamping arm (310) is provided with a first toothed portion (311), and the second clamping arm (320) is provided with a second toothed portion (321) adapted to the first toothed portion (311), wherein the first toothed portion (311) fits positively to the second toothed portion (321), and wherein the clamping region is formed between the first toothed portion (311) and the second toothed portion (321). [11] Thread retraction device according to claim 9, characterized by that one end of the first clamping arm (310) and one end of the second clamping arm (320) are each rotatably connected to the wheel holder (300), the other end of the first clamping arm (310) being opposite the other end of the second clamping arm (320), and whereby the clamping region is formed. [12] Thread retraction device according to claim 9 or 11, characterized bythat the wheel holder (300) is elastic and urges the first clamping arm (310) and the second clamping arm (320) such that the first clamping arm (310) and the second clamping arm (320) tend to form an angle between the first clamping arm (310) and the second clamping arm (320). [13] Thread retraction device according to claim 9, characterized by that in the unlocked state an opening is formed on one side of the clamping area, wherein a part of a second surgical instrument to be clamped enters the clamping area through the opening in a first direction and presses the first clamping arm (310) and the second clamping arm (320) and switches them synchronously into a locking state so that the opening has a reduced degree of opening or is closed, and wherein the first clamping arm (310) and the second clamping arm (320) are synchronously switched to the unlocking state when the clamped part, the first clamping arm (310) or the second clamping arm (320) is operated in a direction opposite to the first direction to remove the clamped part through the opening. [14] Thread retraction device according to claim 13, characterized by that the first clamping arm (310) is provided with a first limiting groove (312), and the second clamping arm (320) is provided with a second limiting groove 322 which is opposite the first limiting groove (312), wherein the clamping region is formed between the first limiting groove (312) and the second limiting groove (322), and wherein in the locked state, the wheel holder (300) urges the first clamping arm (310) and the second clamping arm (320) such that they are pivoted in the first direction, and wherein a second surgical instrument is clamped between the first limiting groove 312 and the second limiting groove 322, and wherein in the unlocked state, the wheel holder (300) urges the first clamping arm (310) and the second clamping arm (320) to pivot in a second direction to expand the opening degree of the clamping area between the first limiting groove (312) and the second limiting groove (322). [15] Thread retraction device according to claim 13 or 14, characterized bythat the wheel holder (300) is provided with a locking structure (304), or the first clamping arm (310) and / or the second clamping arm (320) are provided with a locking structure (304), wherein the locking structure 304 serves to prevent the first clamping arm (310) and the second clamping arm (320) from continuing to be pivoted in the first direction in the locked state. [16] Thread retraction device according to claim 9, characterized by in that the wheel holder (300) is further provided with a cross member (330) which is provided with a recess (303), wherein the recess (303) is designed to receive a second surgical instrument and / or to prevent further movement of a second surgical instrument in the first direction.

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