Distal end chip and medical device
Patent Information
- Application Number
- JP2023002344
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-01-11
- Publication Date
- 2025-10-09
AI Technical Summary
The distal tip of existing medical devices, made of machined metal, is expensive to manufacture due to its complex shape and materials.
A medical distal tip composed of a first pipe and a second pipe joined by a joint, where the second pipe covers the first pipe and has a thicker radial thickness, allowing for easier and less costly manufacturing through laser welding.
The solution enables the production of a medical device with a distal tip that is cost-effective while preventing damage to body lumens during insertion and removal.
Smart Images
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Abstract
Description
[Technical field]
[0001] The present disclosure relates to a medical tip provided at the tip of a medical device. [Background technology]
[0002] Patent Document 1 discloses a basket-type endoscopic treatment tool having a distal tip that joins together the distal ends of multiple basket wires, and a guide wire insertion means that is attached to the distal tip and allows a guide wire to be inserted. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] JP 2020-036663 A Summary of the Invention [Problem to be solved by the invention]
[0004] The tip tip of Patent Document 1 is made of metal and has a mushroom shape with a thin cylindrical portion on the base end and a semi-spherical portion on the tip end. The tip tip is formed by machining, so its production is costly.
[0005] An object of the present disclosure is, for example, to provide a distal tip and a medical device that can be manufactured inexpensively. [Means for solving the problem]
[0006] In order to achieve the above object, a tip tip which is one aspect of the present disclosure is a medical tip tip which is provided at the tip of a basket which is made up of a plurality of wires and which is radially expandable and contractible, and which comprises a first pipe which holds the tips of the plurality of wires inside, a second pipe which is provided so as to cover the outer periphery of the first pipe, and a joint which joins the first pipe and the second pipe to each other.
[0007] The second pipe may have a radial thickness greater than a radial thickness of the first pipe.
[0008] The joint portion may join an end portion of the second pipe to an outer circumferential surface of the first pipe, and may have a tapered surface that tapers from the end portion of the second pipe toward the outer circumferential surface of the first pipe.
[0009] The joint portion may be formed on at least one of both end portions of the second pipe, and may join the at least one end portion to an outer circumferential surface of the first pipe.
[0010] The joint may be formed by welding an end of the second pipe to an outer circumferential surface of the first pipe.
[0011] The first pipe may have a plurality of protrusions, parts of which protrude outward and abut the inner peripheral surface of the second pipe, and when the second pipe is supported by the first pipe by the plurality of protrusions, the central axis of the first pipe and the central axis of the second pipe may be positioned coaxially.
[0012] A medical device according to one aspect of the present disclosure comprises a basket made up of a plurality of wires and capable of expanding and contracting in the radial direction, and the above-described tip provided at the tip of the basket. Effect of the Invention
[0013] According to the present disclosure, it is possible to provide a tip and a medical device that can be manufactured inexpensively. [Brief description of the drawings]
[0014] [Figure 1] FIG. 2 is a partial longitudinal cross-sectional view of a medical device according to an embodiment. [Diagram 2] 1A is a side view of the distal tip, and FIG. 1B is a cross-sectional view of the distal tip. [Diagram 3]FIG. 10A is a cross-sectional view of a tip according to a modified example, and FIG. 10B is a cross-sectional view taken along line Vb-Vb in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] The distal tip and the medical device of the present disclosure will be described below. The medical device is a basket-type medical device that is inserted into a body cavity such as a bile duct and is used to crush and collect foreign bodies such as stones.
[0016] Fig. 1 is a partial longitudinal cross-sectional view of the medical device 1 of the present disclosure, showing a state in which the basket 41 is exposed to the outside of the sheath 10 and expanded. In Fig. 1, the tip portion 50 side is the tip side that is inserted into the body, and the gripping portion 33 side is the base end side that is operated by a technician such as a doctor. For the medical device 1 and each of its components, the tip end is referred to as the "tip", the tip and its vicinity are referred to as the "tip portion", the base end is referred to as the "base end", and the base end and its vicinity are referred to as the "base portion".
[0017] The medical device 1 includes a sheath 10, an operating wire 20, an operating section 30, and a basket section 40.
[0018] The sheath 10 is a long tubular member that forms a lumen 11 and is made of a flexible material. The sheath 10 has a flexible tube 12 made of, for example, resin or metal, and a substantially annular sheath tip 13 made of, for example, metal (stainless steel, etc.) that is joined to the tip of the tube 12. The operation wire 20 is a long wire member that is disposed in the lumen 11 of the sheath 10 so as to be able to advance and retreat along the longitudinal axis direction of the sheath 10.
[0019] The operation section 30 has a main body section 31, an operation pipe 32, and a grip section 33. The operation pipe 32 is a rod-shaped member connected to the base end of the operation wire 20. The grip section 33 is a member connected to the base end of the operation pipe 32 and gripped by the operator. The main body section 31 is a substantially cylindrical member connected to the base end of the sheath 10, and forms a lumen 34. The lumen 34 of the main body section 31 communicates with the lumen 11 of the sheath 10, and the operation pipe 32 is housed in the lumen 34 so as to be movable forward and backward in the longitudinal direction. The main body section 31 is provided with a water supply port 35 for attaching a syringe or the like (not shown) to supply a medicinal solution or the like into the lumen 11 of the sheath 10.
[0020] The basket section 40 includes a distal end portion 50, a basket 41, and a proximal end tip 42. The basket 41 is made up of a plurality of wires 43. Each wire 43 is made up of, for example, a metal. The distal ends of the plurality of wires 43 are collectively held by the distal end portion 50. The proximal ends of the plurality of wires 43 are collectively held by the proximal end tip 42. The basket section 40 is connected to the distal end of the operating wire 20 via the proximal end tip 42. The proximal end tip 42 is formed from, for example, a metal (stainless steel, etc.).
[0021] The wires 43 are self-biased so as to bend and swell outward. Therefore, when the operation wire 20 is at the base end position, the basket section 40 is housed in the lumen 11 of the sheath 10 and is pressed by the inner circumferential surface of the sheath 10 to be in a reduced diameter state. As shown in FIG. 1, when the operation wire 20 moves to the distal end side in response to the operation of the operation section 30 by the operator, the basket 41 protrudes from the distal end of the sheath 10, and the wires 43 expand in diameter due to their self-biasing force to become a cage shape. In this way, the medical device 1 is configured to be switchable between a reduced diameter state in which the basket 41 is housed in the lumen 11 in the sheath 10 in a reduced diameter state and an expanded diameter state in which the basket 41 protrudes from the distal end of the sheath 10 to be expanded in diameter as the operation wire 20 advances and retreats.
[0022] The distal portion 50 includes a distal tip 51 and a guide tip 52 . FIG. 2(a) is a side view of the tip 51, and FIG. 2(b) is a cross-sectional view of the tip 51.
[0023] The tip tip 51 has a first pipe 53, a second pipe 54, and a joint 55. The first pipe 53 has a through hole 53a, and holds the tips of the wires 43 in the through hole 53a. The second pipe 54 has a through hole 54a, and the first pipe 53 passes through the through hole 54a. That is, the inner diameter of the second pipe 54 is larger than the outer diameter of the first pipe 53, and the second pipe 54 is provided so as to cover the outer periphery of the first pipe 53. The axial length of the second pipe 54 is configured to be shorter than the axial length of the first pipe 53.
[0024] The central axis C1 of the first pipe 53 and the central axis C2 of the second pipe 54 are positioned coaxially. The axial center of the first pipe 53 and the axial center of the second pipe 54 coincide with each other. The radial thickness of the second pipe 54 is configured to be thicker than the radial thickness of the first pipe 53. Since the outer diameter of the first pipe 53 is configured to be smaller than the inner diameter of the second pipe 54, a gap G is formed between the first pipe 53 and the second pipe 54. The first pipe 53 and the second pipe 54 are configured of, for example, a metal (stainless steel, etc.).
[0025] The joints 55 join the first pipe 53 and the second pipe 54. The joints 55 are formed on both ends of the second pipe 54. Each joint 55 joins an end of the second pipe 54 and an outer peripheral surface 53B of the first pipe 53, and has a tapered surface 55A that tapers from the end (outer peripheral surface 54B) of the second pipe 54 toward the outer peripheral surface 53B of the first pipe 53. Each joint 55 is formed by welding the end of the second pipe 54 and the outer peripheral surface 53B of the first pipe 53.
[0026] The joint 55 is formed as follows. First, the first pipe 53 and the second pipe 54 are fitted into a jig, and the central axis C1 of the first pipe 53 and the central axis C2 of the second pipe 54 are made coaxial with each other, and the axial center of the first pipe 53 and the axial center of the second pipe 54 are aligned with each other. In this state, the first pipe 53 and the second pipe 54 are temporarily fixed by laser welding. The temporarily fixed first pipe 53 and the second pipe 54 are removed from the jig, and the first pipe 53 and the second pipe 54 are rotated once while applying a laser (e.g., a YAG laser, etc.) to the end of the second pipe 54. As a result, the end of the second pipe 54 and the outer circumferential surface 53B of the first pipe 53 are welded to each other, and the joint 55 is formed.
[0027] As shown in FIG. 1, the guide tip 52 is substantially cylindrical and is provided on the distal end side of the distal tip 51. The guide tip 52 has a recess 52a and a through hole 52b. The recess 52a opens to the base end surface of the guide tip 52. The tip end of the first pipe 53 is inserted into the recess 52a, and the guide tip 52 is fixed to the distal tip 51 by, for example, an adhesive or the like. The through hole 52b is formed along a direction inclined with respect to the central axis C1 (FIG. 2). A guide wire (not shown) is inserted through the through hole 52b. The base end surface of the guide tip 52 is formed into a substantially hemispherical shape. The guide tip 52 is made of, for example, resin.
[0028] The tip tip 51 of this embodiment includes a first pipe 53, a second pipe 54 provided so as to cover the outer periphery of the first pipe 53, and a joint 55 that joins the first pipe 53 and the second pipe 54. As such, the tip tip 51 is made up of two parts, so that the tip tip 51 can be manufactured easily and inexpensively.
[0029] The radial thickness of the second pipe 54 is configured to be thicker than the radial thickness of the first pipe 53. As a result, when the first pipe 53 and the second pipe 54 are joined by laser welding, by applying a laser to the second pipe 54, it is possible to prevent holes from being made in the first pipe even if the first pipe 53 is thin, and the joining work can be easily performed.
[0030] The joint 55 joins the end of the second pipe 54 and the outer peripheral surface 53B of the first pipe 53, and has a tapered surface 55A that tapers from the end of the second pipe 54 toward the outer peripheral surface 53B of the first pipe 53. This makes it possible to prevent the distal tip 51 from getting caught on the inner wall of the biological lumen when the medical device 1 is inserted into or removed from the living body.
[0031] The joint 55 is formed by welding the end of the second pipe 54 and the outer circumferential surface 53B of the first pipe 53. Therefore, the corners of the end of the second pipe 54 are removed (melted), which prevents the distal tip 51 from damaging the inner wall of the biological lumen.
[0032] The present disclosure is not limited to the configuration of the above-described embodiment. The present invention as defined by the claims is not limited to the above-described embodiment, and is intended to include all modifications within the meaning and scope of the claims.
[0033] FIG. 3(a) is a cross-sectional view of a tip chip 51 according to a modified example, and (b) is a cross-sectional view taken along line Vb-Vb in (a).
[0034] As shown in FIG. 3, the first pipe 53 has a plurality of protrusions 53C that protrude outward and abut against an inner peripheral surface 54C of the second pipe 54. When the first pipe 53 is fitted into the second pipe 54 and the second pipe 54 is supported by the first pipe 53 by the plurality of protrusions 53C, the central axis C1 of the first pipe 53 and the central axis C2 of the second pipe 54 are coaxially positioned. Therefore, when the tip 51 is manufactured, it is possible to suppress the deviation of the second pipe 54 relative to the first pipe 53, and it is possible to easily join the first pipe 53 and the second pipe 54. Note that the number of the plurality of protrusions 53C is four in this modification, but it may be three or five or more.
[0035] The first pipe 53 and the second pipe 54 may be made of resin. The joint 55 was formed by YAG welding, but may be formed by other welding methods such as resistance welding. The joint 55 may be formed by joining the first pipe 53 and the second pipe 54 with an adhesive or brazing material. Although the axial center of the first pipe 53 and the axial center of the second pipe 54 are aligned, they do not have to be aligned. [Explanation of symbols]
[0036] 1: medical device, 41: basket, 43: wire, 51: tip, 53: first pipe, 53B: outer circumferential surface, 53C: protrusion, 54: second pipe, 55: joint, 55A: tapered surface
Claims
1. A medical tip provided at the tip of a basket that is made up of multiple wires and is radially expandable and contractible, a first pipe that holds the tip ends of the plurality of wires therein; a second pipe provided so as to cover an outer periphery of the first pipe; a joint portion that joins the first pipe and the second pipe to each other;
2. The tip according to claim 1 , wherein the second pipe has a radial thickness greater than the radial thickness of the first pipe.
3. 3. The tip according to claim 1, wherein the joint portion joins the end of the second pipe and the outer peripheral surface of the first pipe, and has a tapered surface that tapers from the end of the second pipe toward the outer peripheral surface of the first pipe.
4. The tip according to claim 1 , wherein the joint portion is formed on at least one of both end portions of the second pipe, and joins the at least one end portion to an outer peripheral surface of the first pipe.
5. The tip according to claim 1 , wherein the joint portion is formed by welding the end of the second pipe and the outer circumferential surface of the first pipe together.
6. the first pipe has a plurality of protrusions, parts of which protrude outward and come into contact with the inner circumferential surface of the second pipe; The tip according to claim 1 , wherein a central axis of the first pipe and a central axis of the second pipe are coaxially positioned in a state in which the second pipe is supported on the first pipe by the plurality of protrusions.
7. a basket that is made up of a plurality of wires and that is radially expandable and contractible; A medical device comprising: a distal tip according to any one of claims 1 to 6 provided at the distal end of the basket.