A handle device for a minimally invasive medical device for an endoscope

Abstract

The present invention relates to the technical field of medical devices, and particularly to a handle device for a minimally invasive medical device for an endoscope, including a cable, a core rod and a slip ring. The slip ring includes two snap-fitted half rings. Each half ring includes a ring body and a circumferential positioning portion protruding from the inner wall of the ring body towards the other half ring. The circumferential positioning portions on the two half rings cooperate with each other to form a positioning cavity therebetween, and the protruding length of the circumferential positioning portion at least covers the positioning protrusion. In the present invention, the slip ring is formed by enclosing two half rings, which is easy to process. The structures of the two half rings are exactly the same, and a set of molds can be shared, greatly saving costs. At the same time, multiple circumferential positioning portions on the two half rings are distributed on both sides of the positioning protrusion to wrap it, and the positioning protrusion is stressed on both sides, and the stress is more uniform. The protruding length of each circumferential positioning portion at least covers the extension length of the positioning protrusion in this direction, further ensuring the synchronization of the rotation of the slip ring, the cable and the core rod, and improving the operation accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a handle device of a minimally invasive medical device for an endoscope. Background Art

[0002] Minimally invasive medical devices in the prior art generally include a core rod, a slip ring slidably mounted on the core rod, a cable connected to the slip ring, and an end actuator connected to the end of the cable. The slip ring is generally an integrated structure or a split structure. The internal processing of the integrated structure is not easy, resulting in low processing efficiency and a high scrap rate. The split structure generally includes a left half ring and a right half ring. The two have different structures, resulting in the need for two sets of molds, which leads to excessively high costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem that the integrated slip ring in the prior art is difficult to process, and the left half ring and the right half ring in the split slip ring have different structures, resulting in the need for two sets of molds and excessively high costs, a handle device for a minimally invasive medical device for endoscopes is now provided.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a handle device for a minimally invasive medical device for an endoscope, comprising:

[0005] The cable has a positioning protrusion protruding along its radial direction;

[0006] a core rod having a sliding cavity extending along its axial direction;

[0007] And a slip ring, comprising two half rings arranged in a clamping manner, each half ring comprising a ring body slidably sleeved on the outside of a core rod and at least one circumferential positioning portion protruding from the inner wall of the ring body to the other half ring, the circumferential positioning portion being embedded in a sliding cavity to be circumferentially fixed to the core rod, the circumferential positioning portions on the two half rings cooperating with each other to form a positioning cavity therebetween for a positioning protrusion to be clamped in to circumferentially fix the positioning protrusion, and the circumferential positioning portion at least covers the positioning protrusion along its protruding direction, and the parts of the ring body located on both sides of the first protruding portion are protruding to form axial positioning portions for axially limiting the positioning protrusion.

[0008] Furthermore, there are at least two circumferential positioning parts on each half ring, and at least two circumferential positioning parts are distributed on both sides of the positioning protrusion in the radial direction and are staggered. A groove is formed between two adjacent circumferential positioning parts on one half ring, or between the circumferential positioning part and the axial positioning part, for the circumferential positioning part on the other half ring to be embedded.

[0009] Furthermore, a weight-reducing cavity is formed inside the distal axial positioning portion, and the end portion of the axial positioning portion away from the ring body is recessed to form a first supporting groove for accommodating the cable to limit the cable.

[0010] Further, at least one limiting portion is formed by the proximal end of the cavity wall of the sliding cavity protruding, and the half ring has a limiting groove for the limiting portion to be snapped into to limit the sliding ring from moving distally.

[0011] Further, a hook is provided on one side of each half ring along its radial direction, and a clamping groove is provided on the other side. The hooks and the clamping grooves on the two half rings are clamped with each other.

[0012] Further, a plurality of positioning grooves for inserting positioning pins are formed on one side of the two half rings close to each other.

[0013] Further, the cable includes a core wire and a sleeve sleeved outside the core wire, and the sleeve forms the above-mentioned positioning protrusion.

[0014] Further, the ring body includes protruding portions at both ends in its axial direction and a recessed portion between the two protruding portions. There is a gap between the inner peripheral wall of the recessed portion and the outer peripheral wall of the core rod.

[0015] Further, an accommodating cavity for accommodating the proximal end of the cable is formed inside the axial positioning portion at the proximal end, and a supporting portion is formed by the inner wall of the distal end of the ring body protruding. The supporting portion has a second supporting groove for accommodating the core rod and the supporting portion is spaced from the axial positioning portion.

[0016] Further, the cross-sectional area of the accommodating cavity gradually increases in the direction from the distal end to the proximal end.

[0017] Advantages of the present invention: In the present invention, a sliding ring is formed by enclosing two half rings, which is easy to process. And the cable is relatively fixed by using the axially limiting portion and the circumferentially limiting portion protruding on each half ring. The two half rings have exactly the same structure and can share a set of molds, greatly saving costs. At the same time, a plurality of circumferential positioning portions on the two half rings are distributed on both sides of the positioning protrusion to wrap it. The positioning protrusion is stressed on both sides and the stress is more uniform. The protruding length of each circumferential positioning portion at least covers the extension length of the positioning protrusion in this direction, further ensuring the synchronization of the rotation of the sliding ring, the cable and the core rod, and improving the operation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 is the front view of the present invention;

[0021] Figure 3 is Figure 2 the cross-sectional view taken along the line A-A in

[0022] Figure 4 is Figure 2 a sectional view taken along the B-B direction in the figure;

[0023] Figure 5 is a schematic structural view of the left half-ring and the right half-ring;

[0024] Figure 6 is the front view of the cooperation of the half-ring, the core rod and the cable;

[0025] Figure 7 is the three-dimensional schematic view of the cooperation of the half-ring, the core rod and the cable;

[0026] Figure 8 is the three-dimensional schematic view of the half-ring from the first perspective;

[0027] Figure 9 is the three-dimensional schematic view of the half-ring from the second perspective;

[0028] Figure 10 is the front view of the half-ring.

[0029] In the figure:

[0030] 1. Cable; 101. Positioning projection; 102. Core wire;

[0031] 2. Core rod; 201. Sliding cavity; 202. Limiting part; 2021. Inclined surface; 2022. Blocking surface;

[0032] 3. Half-ring; 3a. Left half-ring; 3b. Right half-ring; 301. Ring body; 3011. Protruding part; 3012. Depressed part; 302. Circumferential positioning part; 303. Positioning cavity; 304. Axial positioning part; 3041. Weight-reducing cavity; 3042. First support groove; 3043. Accommodating cavity; 305. Groove; 306. Limiting groove; 307. Hook; 308. Card slot; 309. Positioning slot; 310. Support part; 3101. Second support groove.

[0033] 4. Thumb ring;

[0034] 5. Positioning pin shaft. Detailed implementation manners

[0035] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner. Therefore, they only show the components related to the present invention. Directions and references (such as up, down, left, right, etc.) can only be used to assist in the description of the features in the drawings. Therefore, the following detailed implementation manners are not adopted in a restrictive sense, and the scope of the claimed subject matter is only defined by the appended claims and their equivalent forms.

[0036] As Figures 1-3As shown, a handle device of a minimally invasive medical device for an endoscope includes a core rod 2, a sliding ring sleeved on the core rod 2, and a cable 1 fixed to the sliding ring;

[0037] The cable 1 has a positioning protrusion 101 protruding radially along it. The positioning protrusion 101 is generally in a flat structure. Through this positioning protrusion 101, it can be relatively fixed with the sliding ring. In order to enable the cable 1 to have sufficient movement stroke, the positioning protrusion 101 is preferably located at the proximal end of the cable 1. The distal end of the cable 1 is connected to an end effector (which can be but is not limited to a hemostatic clip, a sampling forceps, a snare, etc.), so as to drive its displacement. In this embodiment, the proximal end is the end close to the operator, and the distal end is the end far from the operator;

[0038] The core rod 2 has a sliding cavity 201 extending along its axial direction, that is, the sliding cavity 201 extends from the proximal end to the distal end of the core rod 2, and a thumb ring 4 is provided at the proximal end of the core rod 2 for the thumb to extend into;

[0039] The sliding ring includes two half rings 3 that are snap-fitted, and is formed by the two half rings 3 being held together. As Figure 5 shown, the two half rings are respectively a left half ring 3a and a right half ring 3b, and their structures are exactly the same;

[0040] Each half ring 3 includes a ring body 301 slidably sleeved outside the core rod 2 and at least one circumferential positioning portion 302 protruding from the inner wall of the ring body 301 towards the other half ring 3. The circumferential positioning portion 302 is embedded in the sliding cavity 201 to be circumferentially fixed with the core rod 2, that is, rotating the sliding ring can drive the core rod 2 to rotate synchronously, and the circumferential positioning portion 302 can reciprocate in the sliding cavity 201;

[0041] As Figure 4 shown, the circumferential positioning portions 302 on the two half rings 3 cooperate with each other to form a positioning cavity 303 for the positioning protrusion 101 to be snapped into to circumferentially fix the positioning protrusion 101. The shape of the positioning cavity 303 matches the shape of the positioning protrusion 101, and is also generally in a flat structure. When the sliding ring rotates, it can drive the cable 1 to rotate synchronously. One side wall surface of the circumferential positioning portion 302 is attached to the cavity wall of the sliding cavity 201 of the core rod 2 to achieve synchronous rotation with the core rod 2, and the other side wall surface of the circumferential positioning portion 302 is attached to the cable 1 to achieve synchronous rotation with the cable 1. Thus, when the core rod 2 is twisted alone, the synchronous rotation of the sliding ring and the cable 1 can be realized, and the consistency of the rotation of the three is ensured.

[0042] The circumferential positioning portion 302 covers at least the positioning protrusion along its protruding direction. One end of the circumferential positioning portion 302 is a fixed end fixed to the ring body 301, and the other end is a free end. The free end extends at least to cover the positioning protrusion 101, that is, the end face of the free end is flush with the end face of the positioning protrusion 101 facing away from the ring body 301 or protrudes from the end face of the positioning protrusion 101, so as to fully wrap the positioning protrusion 101, further ensuring the consistency of rotation. At the same time, the multiple circumferential positioning portions 302 on the two half rings 3 wrap the positioning protrusion 101, and the positioning protrusion 101 is stressed on both sides, and the stress is more uniform.

[0043] On the parts of the ring body 301 on both sides of the first protruding portion 3011 in the axial direction, there are axially protruding axial positioning portions 304 for axially limiting the positioning protrusion 101, that is, one axial positioning portion 304 is located at the proximal end of the positioning protrusion 101, and the other axial positioning portion 304 is located at the distal end of the positioning protrusion 101, and both axial positioning portions 304 are embedded in the sliding groove 201.

[0044] During operation, the thumb is inserted into the thumb ring 4 to hook it, and at the same time, the index finger and the middle finger hook the sliding ring. By pushing and pulling the sliding ring, the sliding ring can be driven to move back and forth. The axial positioning portion 304 and the positioning protrusion 101 are axially fixed so that the cable 1 follows the sliding ring to displace synchronously, thereby driving the end effector at the distal end of the cable 1 to extend or retract;

[0045] At the same time, the circumferential positioning portion 302 circumferentially fixes the sliding ring, the cable 1 and the core rod 2. By twisting the core rod 2, the sliding ring and the cable 1 can be driven to rotate synchronously to rotate the end effector at the distal end of the cable 1 to different positions, and then perform corresponding minimally invasive surgical operations. The multiple circumferential positioning portions 302 on the two half rings 3 are distributed on both sides of the positioning protrusion 101 to wrap it. The positioning protrusion 101 is stressed on both sides, and the stress is more uniform. The protruding length of each circumferential positioning portion 302 at least covers the extension length of the positioning protrusion 101 in this direction, further ensuring the synchronism of the rotation of the sliding ring, the cable 1 and the core rod 2, thereby improving the operation accuracy. In this embodiment, the two half rings 3 are clamped together to form a sliding ring, which is easy to process, and the axially protruding axial positioning portion 304 and circumferential positioning portion 302 on each half ring 3 are used to relatively fix the cable 1. The structures of the two half rings 3 are exactly the same, and a set of molds can be shared, greatly saving costs.

[0046] In some examples, there are at least two circumferential positioning portions 302 on each half ring 3, and at least two circumferential positioning portions 302 are distributed on both sides of the positioning protrusion 101 in the radial direction and are staggered. A groove 305 is formed between two adjacent circumferential positioning portions 302 on one half ring 3, or between the circumferential positioning portion 302 and the axial positioning portion 304, for the circumferential positioning portion 302 on the other half ring 3 to be embedded. The multiple circumferential positioning portions 302 correspond one-to-one to the multiple grooves 305, and each circumferential positioning portion 302 is embedded in its corresponding groove 305, so that the two half rings 3 are engaged with each other to avoid axial misalignment between the two.

[0047] When there are two circumferential positioning portions 302 on each half ring 3, the two are respectively located on both sides of the positioning protrusion 101 in the radial direction and are staggered with each other along the axial direction of the core rod 2, that is, one is located at the proximal end and the other is located at the distal end. The above-mentioned groove 305 is formed between the circumferential positioning portion 302 at the proximal end and the axial positioning portion 304 at the distal end. Similarly, the above-mentioned groove 305 is also formed between the circumferential positioning portion 302 at the distal end and the axial positioning portion 304 at the proximal end. After the two half rings 3 are assembled, the circumferential positioning portions 302 are embedded in their corresponding grooves 305.

[0048] like Figures 6-10 As shown, when there are three circumferential positioning portions 302 on each half ring 3, two of the circumferential positioning portions 302 are located on one side of the positioning protrusion 101 and the aforementioned groove 305 is formed between them. The other circumferential positioning portion 302 is located on the other side of the positioning protrusion 101 and has two grooves 305 formed between it and the axial positioning portion 304. Therefore, the number of grooves 305 is also three. After the two half rings 3 are assembled, the circumferential positioning portions 302 are embedded in their corresponding grooves 305. Of course, the number of circumferential positioning portions 302 on each half ring 3 can also be four, five, etc., and this is not limited in this embodiment.

[0049] In some examples, a weight-reducing cavity 3041 is formed inside the axial positioning portion 304 at the distal end, and the end portion of the axial positioning portion 304 facing away from the ring body 301 in which it is located is recessed to form a first support groove 3042 for accommodating the cable 1 to limit the position of the cable 1. After the two half rings 3 are assembled, the first support groove 3042 confines the cable 1 inside it to prevent the cable 1 from bending and deforming, which affects the operating accuracy.

[0050] In some examples, at least one limiting portion 202 is formed by the proximal protrusion of the cavity wall of the sliding cavity 201. The half ring 3 has a limiting groove 306 for the limiting portion 202 to be snapped into to limit the distal movement of the sliding ring. The protruding height of the limiting portion 202 gradually decreases in the direction from the proximal end to the distal end, that is, the surface of the limiting portion 202 facing away from the cavity wall where it is located is an inclined surface 2021, and the proximal end face of the limiting portion 202 is a blocking surface 2022. When the operator hooks the sliding ring to drive the cable 1 to move proximally, the cable 1 drives the end effector to move synchronously through the separable connector. When the pulling force reaches a predetermined value, the separable connector separates, causing the end effector to separate from the cable 1. At the same time, the inclined surface 2021 of the limiting portion 202 on the core rod 2 first contacts the sliding ring and undergoes a certain elastic deformation. When the sliding ring continues to move proximally until the limiting portion 202 is aligned with the limiting groove 306, the limiting portion 202 resets and falls into the limiting groove 306, and the blocking surface 2022 can limit the distal movement of the sliding ring to prevent the non-expected extension of the distal end of the cable 1 caused by the operator accidentally touching the sliding ring from piercing the tissue piece.

[0051] In some examples, each half ring 3 is provided with a hook 307 on one side along its radial direction and a slot 308 on the other side. The hooks 307 and slots 308 on the two half rings 3 are engaged with each other. The number of hooks 307 and slots 308 is equal, and can be but not limited to one, two, three, etc. The hook 307 is snapped into the corresponding slot 308 to realize the connection of the two half rings 3.

[0052] In some examples, a plurality of positioning grooves 309 for the positioning pin 5 to be inserted are formed on one side where the two half rings 3 are close to each other. When assembling the sliding ring, the positioning pin 5 is inserted into the corresponding positioning groove 309 to further improve the connection strength of the two half rings 3.

[0053] In some examples, the cable 1 includes a core wire 102 and a sleeve sleeved outside the core wire 102. The sleeve forms the above-mentioned positioning protrusion 101 and the sleeve is fixed to the proximal end of the core wire 102. The fixing method between the core wire 102 and the sleeve can be but not limited to spot welding, and then riveting and pressing to form a flat structure for circumferential fixation with the sliding ring.

[0054] In some examples, the ring body 301 includes protruding portions 3011 at both ends in its axial direction and a recessed portion 3012 between the two protruding portions 3011. There is a gap between the inner peripheral wall of the recessed portion 3012 and the outer peripheral wall of the core rod 2, which can reduce the contact area between the sliding ring and the core rod 2 and further reduce the friction force when the two move relative to each other, making the operation more labor-saving; the protruding portions 3011 on both sides limit the index finger and middle finger at the position of the recessed portion 3012 to hook the sliding ring, and then cooperate with the thumb in the thumb ring 4 to realize the pushing and pulling of the sliding ring.

[0055] In some examples, a receiving cavity 3043 for receiving the proximal end of the cable 1 is formed inside the axially positioning portion 304 at the proximal end. A supporting portion 310 protrudes from the inner wall of the distal end of the annular body 301. The supporting portion 310 is embedded in the sliding groove 201, and the supporting portion 310 has a second supporting groove 3101 for receiving the core rod 2. The supporting portion 310 and the axially positioning portion 304 at the distal end are spaced apart to further reduce weight. The proximal end of the core rod 2 is supported by the supporting portion 310, the axially positioning portion 304, and the circumferentially positioning portion 302 respectively, which can prevent it from bending and deforming.

[0056] In some examples, the cross-sectional area of the receiving cavity 3043 gradually increases in the direction from the distal end to the proximal end to form a dovetail groove structure. When the sleeve and the core wire 102 are fixed by electric welding, the high temperature easily causes the proximal end of the core wire 102 to deflect. The dovetail groove is provided to facilitate the end of the deflected core wire 102 to be received therein.

[0057] Working principle:

[0058] During operation, the thumb extends into the thumb ring 4 to hook it. At the same time, the index finger and the middle finger hook the sliding ring. By pushing and pulling the sliding ring, the sliding ring can be driven to move reciprocally. The axially positioning portion 304 and the positioning protrusion 101 are axially fixed so that the cable 1 follows the sliding ring to displace synchronously, thereby driving the end effector at the distal end of the cable 1 to extend or retract. When the sliding ring passes over the limiting portion 202 and the limiting portion 202 falls into the limiting groove 306, the blocking surface 2022 can limit the sliding ring to move distally to avoid the unexpected extension of the distal end of the cable 1 caused by the operator accidentally touching the sliding ring and piercing the tissue.

[0059] At the same time, the circumferentially positioning portion 302 circumferentially fixes the sliding ring, the cable 1, and the core rod 2. By twisting the core rod 2, the sliding ring and the cable 1 can be driven to rotate synchronously to rotate the end effector at the distal end of the cable 1 to different orientations, and then perform corresponding minimally invasive surgical operations. The multiple circumferentially positioning portions 302 on the two half rings 3 are distributed on both sides of the positioning protrusion 101 to wrap it. The positioning protrusion 101 is stressed on both sides, and the stress is more uniform. The protruding length of each circumferentially positioning portion 302 at least covers the extension length of the positioning protrusion 101 in this direction, further ensuring the synchronism of the rotation of the sliding ring, the cable 1, and the core rod 2, thereby improving the operation accuracy.

[0060] Inspired by the above ideal embodiments according to the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A handle device for a minimally invasive medical device for an endoscope, characterized in that: Comprising: A cable (1) having a positioning projection (101) protruding radially along it; A core rod (2) having a sliding cavity (201) extending axially along it; And a slip ring, including two half-rings (3) snap-fitted together. Each half-ring (3) includes a ring body (301) slidably sleeved outside the core rod (2) and at least one circumferential positioning portion (302) protruding from the inner wall of the ring body (301) towards the other half-ring (3). The circumferential positioning portion (302) is embedded in the sliding cavity (201) to be circumferentially fixed to the core rod (2); The circumferential positioning portions (302) on the two half-rings (3) cooperate with each other to form a positioning cavity (303) for the positioning projection (101) to be snapped into to circumferentially fix the positioning projection (101). The circumferential positioning portion (302) covers at least the positioning projection (101) along its protruding direction; Portions of the ring body (301) on both sides of the circumferential positioning portion (302) protrude to form an axial positioning portion (304) for axially limiting the positioning projection (101); A weight-reducing cavity (3041) is formed inside the axial positioning portion (304) at the distal end, and a first support groove (3042) for accommodating the cable (1) to support the cable (1) is formed by the end of the axial positioning portion (304) deviating from the ring body (301) where it is located being recessed; At least one limiting portion (202) protrudes from the proximal end of the cavity wall of the sliding cavity (201). The half-ring (3) has a limiting groove (306) for the limiting portion (202) to be snapped into to limit the slip ring from moving distally; A hook (307) is provided on one side of each half-ring (3) along its radial direction, and a slot (308) is provided on the other side. The hooks (307) and slots (308) on the two half-rings (3) are snap-fitted with each other; An accommodating cavity (3043) for accommodating the proximal end of the cable (1) is formed inside the axial positioning portion (304) at the proximal end, and a support portion (310) protrudes from the inner wall of the distal end of the ring body (301). The support portion (310) has a second support groove (3101) for accommodating the core rod (2). The support portion (310) is spaced apart from the axial positioning portion (304) at the distal end; 2. The handle device of a minimally invasive medical device for an endoscope according to claim 1, wherein: The number of circumferential positioning portions (302) on each half-ring (3) is at least two. At least two circumferential positioning portions (302) are distributed on both sides of the positioning projection (101) in the radial direction and are staggered. A groove (305) for the circumferential positioning portion (302) on the other half-ring (3) to be embedded is formed between two adjacent circumferential positioning portions (302) on one half-ring (3), or between the circumferential positioning portion (302) and the axial positioning portion (304); 3. The handle device of a minimally invasive medical device for an endoscope according to claim 1, characterized in that: A plurality of positioning slots (309) for the positioning pin shafts (5) to be inserted are formed on one side of the two half-rings (3) close to each other; 4. The handle device of a minimally invasive medical device for an endoscope according to claim 1, characterized in that: The cable (1) includes a core wire (102) and a sleeve sleeved outside the core wire (102), and the sleeve forms the above-mentioned positioning projection (101).

5. The handle device of a minimally invasive medical device for an endoscope according to claim 1, characterized in that: The annular body (301) includes protruding portions (3011) located at both axial ends thereof and a recessed portion (3012) located between the two protruding portions (3011), and there is a gap between the inner peripheral wall of the recessed portion (3012) and the outer peripheral wall of the core rod (2).

6. The handle device of a minimally invasive medical device for an endoscope according to claim 5, characterized in that: The cross-sectional area of the accommodation cavity (3043) gradually increases in the direction from the distal end to the proximal end.

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