Handle device of minimally invasive medical instrument for endoscope

Abstract

The invention relates to the technical field of medical instruments, in particular to a handle device of a minimally invasive medical instrument for an endoscope, the handle device comprises an inhaul cable, a core rod and a slip ring, the slip ring comprises two semi-rings arranged in a clamped mode, and each semi-ring comprises a ring body and a circumferential positioning part formed by protruding from the inner wall of the ring body to the other semi-ring; the circumferential positioning parts on the two half rings are matched with each other to form a positioning cavity between the two half rings, and the protruding length of the circumferential positioning parts at least covers the positioning protrusions; the slip ring is formed by the two semi-rings in an embracing mode, machining is easy, the two semi-rings are completely identical in structure and can share one set of die, cost is greatly saved, meanwhile, the multiple circumferential positioning parts on the two semi-rings are distributed on the two sides of the positioning protrusion to wrap the positioning protrusion, the positioning protrusion is stressed on the two sides, stress is more uniform, and the service life of the slip ring is prolonged. The protruding length of each circumferential positioning part at least covers the extending length of the positioning protrusion in the direction, the rotating synchronism of the sliding ring, the inhaul cable and the core rod is further guaranteed, and the operation precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a handle device of a minimally invasive medical instrument 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 high scrap rate, while 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 an endoscope 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 cooperate 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 a circumferential positioning part and an 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 axial positioning portion at the distal end, and a first supporting groove for accommodating the cable to limit the cable is formed at one end of the axial positioning portion away from the ring body where the cable is located.

[0010] Furthermore, at least one limiting portion is protruded from the proximal end of the cavity wall of the sliding cavity, and the half ring has a limiting groove for the limiting portion to be inserted into to limit the movement of the sliding ring toward the distal end.

[0011] Furthermore, each half ring is provided with a hook on one side in the radial direction and a slot on the other side, and the hooks and slots on the two half rings are engaged with each other.

[0012] Furthermore, a plurality of positioning grooves for inserting positioning pins are provided on the sides of the two half rings that are close to each other.

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

[0014] Furthermore, the ring body includes protrusions at two ends of the ring body in the axial direction and a recessed portion between the two protrusions, and a gap is provided between the inner peripheral wall of the recessed portion and the outer peripheral wall of the core rod.

[0015] Furthermore, a receiving 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 protruded from the inner wall of the distal end of the ring body, the supporting portion has a second supporting groove for accommodating the core rod and the supporting portion is spaced apart from the axial positioning portion.

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

[0017] The beneficial effects of the present invention are as follows: the present invention forms a slip ring by embracing two half rings, which is easy to process, and utilizes the axial limiting portion and the circumferential limiting portion protruding from each half ring to relatively fix the cable. The two half rings have exactly the same structure and can share a set of molds, which greatly saves costs. At the same time, the 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, so the force is more evenly applied. The protruding length of each circumferential positioning portion at least covers the extended length of the positioning protrusion in this direction, which further ensures the synchronization of the rotation of the slip ring, the cable and the core rod, and improves the operating accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

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

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

[0021] Figure 3 yes Figure 2 Sectional view in the AA direction;

[0022] Figure 4 yes Figure 2 Cross-sectional view in the BB direction;

[0023] Figure 5 It is a schematic diagram of the structure of the left half ring and the right half ring;

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

[0025] Figure 7 It is a three-dimensional schematic diagram of the coordination of the half ring, the core rod and the cable;

[0026] Figure 8 It is a three-dimensional schematic diagram of the semi-circle from the first-person perspective;

[0027] Fig. 9 It is a three-dimensional schematic diagram of the second perspective of the semi-ring;

[0028] Fig.10 This is the front view of the semi-ring.

[0029] In the figure:

[0030] 1. cable; 101. positioning protrusion; 102. core wire;

[0031] 2. core rod; 201. sliding cavity; 202. limiting portion; 2021. inclined surface; 2022. blocking surface;

[0032] 3. Half ring; 3a. Left half ring; 3b. Right half ring; 301. Ring body; 3011. Protrusion; 3012. Recess; 302. Circumferential positioning portion; 303. Positioning cavity; 304. Axial positioning portion; 3041. Weight reduction cavity; 3042. First supporting groove; 3043. Accommodating cavity; 305. Groove; 306. Limiting groove; 307. Hook; 308. Slot; 309. Positioning groove; 310. Support portion; 3101. Second supporting groove.

[0033] 4. Thumb ring;

[0034] 5. Positioning pin shaft. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0036] like Figure 1-Figure 3As shown, a handle device of a minimally invasive medical device for an endoscope comprises a core rod 2, a slip ring slidably sleeved on the core rod 2, and a cable 1 fixed to the slip ring;

[0037] The cable 1 has a positioning protrusion 101 protruding along its radial direction. The positioning protrusion 101 is generally a flat structure. The positioning protrusion 101 can be relatively fixed to the slip ring. In order to make the cable 1 have a 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 the end actuator (which can be but not limited to a hemostatic clamp, a sampling forceps, a snare, etc.), thereby driving its displacement. In this embodiment, the proximal end is the end close to the operator, and the distal end is the end away 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 be inserted into;

[0039] The slip ring includes two half rings 3 that are clamped together and are formed by the two half rings 3 embracing each other. Figure 5 As shown, the two half rings are respectively a left half ring 3a and a right half ring 3b, and the structures of the two are exactly the same;

[0040] Each half ring 3 includes a ring body 301 slidably mounted on the outside of the core rod 2 and at least one circumferential positioning portion 302 protruding from the inner wall of the ring body 301 toward 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] like Figure 4 As shown, the circumferential positioning parts 302 on the two half rings 3 cooperate with each other to form a positioning cavity 303 between the two for the positioning protrusion 101 to be inserted to fix the positioning protrusion 101 circumferentially. The shape of the positioning cavity 303 matches the shape of the positioning protrusion 101 and is also a roughly flat structure. When the slip ring rotates, it can drive the cable 1 to rotate synchronously. One side wall of the circumferential positioning part 302 fits with the 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 of the circumferential positioning part 302 fits with the cable 1 to achieve synchronous rotation with the cable 1, so that when the core rod 2 is twisted alone, the synchronous rotation of the slip ring and the cable 1 can be achieved, and the consistency of the rotation of the three can be guaranteed.

[0042] The circumferential positioning portion 302 at least covers 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, and the free end at least extends 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 end of the ring body 301 or protrudes from the end face of the positioning protrusion 101, so that the positioning protrusion 101 can be fully wrapped, further ensuring the consistency of rotation, and at the same time, multiple circumferential positioning portions 302 on the two half rings 3 wrap the positioning protrusion 101, and the positioning protrusion 101 is subjected to force on both sides, and the force is more uniform.

[0043] The ring body 301 has axially protruding portions on both sides of the first protrusion 3011 to form axial positioning portions 304 for axially limiting the positioning protrusion 101, that is, one of the axial positioning portions 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 the index finger and the middle finger hook the slip ring at the same time. The slip ring can be driven to move back and forth by pushing and pulling the slip ring. The axial positioning portion 304 and the positioning protrusion 101 are axially fixed to make the cable 1 move synchronously with the slip ring, thereby driving the end actuator at the far end of the cable 1 to extend or retract;

[0045] At the same time, the circumferential positioning part 302 fixes the slip ring, the cable 1 and the core rod 2 circumferentially. By twisting the core rod 2, the slip ring and the cable 1 can be driven to rotate synchronously to rotate the end actuator at the far end of the cable 1 to different positions, and then the corresponding minimally invasive surgery is performed. The multiple circumferential positioning parts 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 subjected to force on both sides, and the force is more uniform. The protruding length of each circumferential positioning part 302 at least covers the extended length of the positioning protrusion 101 in this direction, further ensuring the synchronization of the rotation of the slip ring, the cable 1 and the core rod 2, thereby improving the operation accuracy. In this embodiment, the slip ring is formed by embracing two half rings 3, which is easy to process, and the axial positioning part 304 and the circumferential positioning part 302 protruding from each half ring 3 are used to relatively fix the cable 1. The two half rings 3 have exactly the same structure and can share a set of molds, which greatly saves costs.

[0046] In some examples, the number of circumferential positioning portions 302 on each half ring 3 is at least two, 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 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. The multiple circumferential positioning portions 302 correspond to the multiple grooves 305 one by one, 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 located at the proximal end and the axial positioning portion 304 located at the distal end. Similarly, the above-mentioned groove 305 is also formed between the circumferential positioning portion 302 located at the distal end and the axial positioning portion 304 located at the proximal end. After the two half rings 3 are assembled, the circumferential positioning portion 302 is embedded in the corresponding groove 305;

[0048] like Figure 6-Figure 10 As shown, when there are three circumferential positioning parts 302 on each half ring 3, two of the circumferential positioning parts 302 are located on one side of the positioning protrusion 101 and the above-mentioned groove 305 is formed between the two, and the other circumferential positioning part 302 is located on the other side of the positioning protrusion 101 and two grooves 305 are formed between the axial positioning part 304, so the number of grooves 305 is also three. After the two half rings 3 are assembled, the circumferential positioning parts 302 are embedded in the corresponding grooves 305. Of course, the number of circumferential positioning parts 302 on each half ring 3 can also be four, five, etc., which is not limited in this embodiment.

[0049] In some examples, a weight-reducing cavity 3041 is formed inside the axial positioning portion 304 located at the distal end, and the end portion of the axial positioning portion 304 that is 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 therein to prevent the cable 1 from bending and deforming, which would affect the operating accuracy.

[0050] In some examples, at least one limiting portion 202 is formed on the proximal end of the cavity wall of the sliding cavity 201, and the half ring 3 has a limiting groove 306 for the limiting portion 202 to be inserted into to limit the movement of the sliding ring toward the distal end. The protruding height of the limiting portion 202 gradually decreases from the proximal end to the distal end, that is, the side of the limiting portion 202 facing away from the cavity wall where it is located is a slope 2021, and the proximal end face of the limiting portion 202 is a blocking surface 2022. When the operator hooks the slip ring to drive the cable 1 to move toward the proximal end, the cable 1 drives the end actuator to move synchronously through the detachable connecting piece. When the pulling force reaches the predetermined value, the detachable connecting piece separates to separate the end actuator from the cable 1. At the same time, the inclined surface 2021 of the upper limit portion 202 of the core rod 2 first contacts the slip ring and undergoes a certain elastic deformation. When the slip ring continues to move toward the proximal end until the limit portion 202 is opposite to the limit groove 306, the limit portion 202 resets and sinks into the limit groove 306. The blocking surface 2022 can limit the movement of the slip ring toward the distal end to prevent the operator from accidentally touching the slip ring, which may cause the distal end of the cable 1 to extend unexpectedly and puncture 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 groove 308 on the other side. The hooks 307 and the grooves 308 on the two half rings 3 are engaged with each other. The number of the hooks 307 and the grooves 308 is equal, and can be but not limited to one, two or three, etc. The hook 307 is engaged with the corresponding groove 308 to achieve the engagement of the two half rings 3.

[0052] In some examples, a plurality of positioning grooves 309 for inserting the positioning pins 5 are provided on the sides of the two half rings 3 that are close to each other. When the slip ring is assembled, the positioning pins 5 are inserted into the corresponding positioning grooves 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 on the outside of 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, and the fixing method between the core wire 102 and the sleeve can be but is not limited to spot welding, and then riveted and flattened to form a flat structure to be circumferentially fixed to the slip ring.

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

[0055] In some examples, a receiving cavity 3043 for accommodating the proximal end of the cable 1 is formed inside the axial positioning portion 304 located at the proximal end, and a support portion 310 is protruded from the inner wall of the distal end of the ring body 301. The support portion 310 is embedded in the sliding groove 201, and the support portion 310 has a second support groove 3101 for accommodating the core rod 2. The support portion 310 and the axial positioning portion 304 located at the distal end are spaced apart to further reduce weight. The proximal end of the core rod 2 is supported by the support portion 310, the axial positioning portion 304 and the circumferential positioning portion 302 respectively to prevent it from bending and deformation.

[0056] In some examples, the cross-sectional area of ​​the accommodating cavity 3043 gradually increases 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 setting of the dovetail groove makes it easier for the deflected end of the core wire 102 to be accommodated therein.

[0057] Working principle:

[0058] During operation, the thumb is inserted into the thumb ring 4 to hook it, while the index finger and the middle finger hook the slip ring, and the slip ring can be driven to move back and forth by pushing and pulling the slip ring. The axial positioning portion 304 and the positioning protrusion 101 are axially fixed so that the cable 1 moves synchronously with the slip ring, thereby driving the end actuator at the far end of the cable 1 to extend or retract. When the slip ring passes over the limiting portion 202 and the limiting portion 202 is sunk into the limiting groove 306, the blocking surface 2022 can limit the slip ring from moving to the far end to avoid the operator accidentally touching the slip ring, which causes the far end of the cable 1 to extend unexpectedly and pierce the tissue piece.

[0059] At the same time, the circumferential positioning portion 302 fixes the slip ring, cable 1 and core rod 2 circumferentially. By twisting the core rod 2, the slip ring and cable 1 can be driven to rotate synchronously to rotate the end actuator located at the far end of the cable 1 to different orientations, 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 subjected to force on both sides, and the force is more uniform. The protruding length of each circumferential positioning portion 302 at least covers the extended length of the positioning protrusion 101 in this direction, which further ensures the synchronization of the rotation of the slip ring, cable 1 and core rod 2, thereby improving the operating accuracy.

[0060] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of 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: include: The cable (1) has a positioning protrusion (101) protruding along its radial direction; A core rod (2) having a sliding cavity (201) extending along its axial direction; and a slip ring, comprising two half rings (3) that are clamped together, each half ring (3) comprising a ring body (301) that is slidably sleeved on the outside of a core rod (2) and at least one circumferential positioning portion (302) that protrudes from the inner wall of the ring body (301) toward the other half ring (3), the circumferential positioning portion (302) being embedded in a 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) therebetween for the positioning protrusion (101) to be inserted into so as to fix the positioning protrusion (101) circumferentially, and the circumferential positioning portion (302) at least covers the positioning protrusion (101) along its protruding direction; The ring body (301) is provided with axial positioning portions (304) protruding from the portions located on both sides of the circumferential positioning portion (302) for axially limiting the positioning protrusion (101).

2. The handle device of a minimally invasive medical device for endoscope according to claim 1, characterized in that: The number of circumferential positioning portions (302) on each half ring (3) is at least two, and the at least two circumferential positioning portions (302) are distributed on both sides of the positioning protrusion (101) in a radial direction and are arranged alternately, and 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 a circumferential positioning portion (302) and an axial positioning portion (304).

3. The handle device of a minimally invasive medical device for endoscope according to claim 1, characterized in that: A weight-reducing cavity (3041) is formed inside the axial positioning portion (304) at the distal end, and a first supporting groove (3042) for accommodating the cable (1) to support the cable (1) is formed in a recessed manner at one end of the axial positioning portion (304) away from the ring body (301) where the axial positioning portion (304) is located.

4. The handle device of a minimally invasive medical device for endoscope according to claim 1, characterized in that: At least one limiting portion (202) is formed on the proximal end of the cavity wall of the sliding cavity (201), and the half ring (3) has a limiting groove (306) for the limiting portion (202) to be inserted into to limit the movement of the sliding ring toward the distal end.

5. The handle device of a minimally invasive medical instrument for endoscope according to claim 1, characterized in that: Each half ring (3) is provided with a hook (307) on one side in the radial direction thereof, and a slot (308) on the other side thereof; the hooks (307) and slots (308) on the two half rings (3) are mutually engaged.

6. The handle device of a minimally invasive medical device for endoscope according to claim 1, characterized in that: A plurality of positioning grooves (309) for inserting positioning pin shafts (5) are provided on the sides of the two half rings (3) that are close to each other.

7. The handle device of a minimally invasive medical device for endoscope according to claim 1, characterized in that: The cable (1) comprises a core wire (102) and a sleeve sleeved outside the core wire (102), wherein the sleeve forms the positioning protrusion (101).

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

9. The handle device of a minimally invasive medical instrument for endoscope according to claim 1, characterized in that: An accommodating cavity (3043) for accommodating the proximal end of the cable (1) is formed inside the axial positioning portion (304) located at the proximal end, and a supporting portion (310) is protruded from the inner wall of the distal end of the ring body (301), and the supporting portion (310) has a second supporting groove (3101) for accommodating the core rod (2), and the supporting portion (310) is spaced apart from the axial positioning portion (304) located at the distal end.

10. The handle device of a minimally invasive medical instrument for endoscope according to claim 9, characterized in that: The cross-sectional area of ​​the accommodating cavity (3043) gradually increases from the distal end to the proximal end.

Images