JP2020121059A - Medical sheath - Google Patents

Abstract

To provide a medical sheath capable of preventing exposure of wires of a braid layer in a configuration simpler than that of a conventional one and reducing the number of components and the cost.SOLUTION: A medical sheath 1 comprises: a tube 20 including a main lumen 23, first and second wire lumens 21 and 22, and a braid layer 24 disposed to enclose the respective lumens 21-23; a pull ring 40 provided at a tube distal end 20A; first and second wires 31 and 32 respectively forward/rearward movably inserted into the respective wire lumens 21 and 22, and respectively including joining parts 31a and 32a to be joined with an inner surface 40a of the pull ring 40, at one ends thereof; and an operation part 3 to which the other ends of the respective wires 31 and 32 are connected at a tube proximal end 20B. Whole circumference of the end portion 24A of the tube distal end 20A side in the braid layer 24 is disposed inside the pull ring 40.SELECTED DRAWING: Figure 5

Description

The present invention relates to a medical sheath used for catheter treatment and the like.

In catheter treatment, a catheter is inserted into a tissue of an organ to be treated through a blood vessel, a body cavity, a body lumen, etc. in the body, and the target treatment is performed on the tissue by a treatment means provided at the tip of the catheter. .. In performing such catheter treatment, a medical sheath into which a catheter is inserted is used in order to facilitate insertion of the catheter and easy access to tissue.

As a conventional medical sheath, the direction of the distal end of the tube can be changed by operating the pull ring embedded in the distal end, which is the tip side of the flexible tube to be inserted into the body, with two operation wires. There is one with the structure. The operation wire is connected to an operation section provided at the proximal end of the tube on the proximal end side of the tube, and is operated by the operation section to be advanced and retracted in the tube. Further, the tube is reinforced by embedding a blade layer formed by braiding wire rods.

In the medical sheath having the above-mentioned structure, it is known that an annular pull ring is installed in a cutout portion obtained by cutting and removing a part of the blade layer on the distal end side in the circumferential direction. (See, for example, Patent Document 1). In this Patent Document 1, the wire rod that constitutes the blade layer is exposed from the cut surface of the blade layer to the outside by the cover ring that is installed in contact with the end surface of the pull ring on the tube proximal end side. A configuration for preventing this is disclosed.

JP, 2005-171430, A

However, in the conventional medical sheath described in the above-mentioned Patent Document 1, there is a problem that the structure is complicated and the number of parts is increased by installing the cover ring, and the cost is also increased accordingly. There was such a problem.

The present invention has been made in view of the above circumstances, and a medical sheath that can prevent the exposure of the wire material of the blade layer with a simpler configuration than the conventional one, and as a result can reduce the number of parts and the cost. It is intended to be provided.

The medical sheath according to the present invention has a main lumen and a wire lumen, and a blade layer having an annular cross section arranged so as to surround the main lumen and the wire lumen, and the tube distal end on one end side is inside the body. A tube having a tube proximal end on the other end side arranged outside the body, a pull ring provided at the tube distal end, and a wire ring that is insertably inserted into the wire lumen and is attached to one end of the tube. An operating wire having a joining portion joined to the inner surface of a pull ring, and the tube proximal end provided with the other end of the operating wire connected thereto, and the tube together with the pull ring by advancing and retracting the operating wire. An operating portion for displacing the direction of the distal end, and the end portion of the blade layer on the tube distal end side is disposed inside the pull ring.

With this configuration, in the present invention, it is possible to prevent the wire rod at the end portion of the blade layer on the tube distal end side from being exposed by the pull ring. Therefore, since it is not necessary to install the conventional cover ring, it is possible to prevent the wire material of the blade layer from being exposed with a simpler configuration than the conventional one. As a result, according to the present invention, the number of parts and the cost can be reduced.

In the medical sheath according to the present invention, the one end portion of the operation wire has a non-joint portion that is not joined to the inner surface of the pull ring on the tube proximal end side from the joint portion, and the one in the blade layer. A part of the distal end of the tube is inserted between the unbonded portion of the manipulation wire and the inner surface of the pull ring.

In the present invention, since the operating wire has a non-joint portion, the end portion of the blade layer on the tube distal end side is inserted between the non-joint portion and the inner surface of the pull ring, so that the entire end portion of the blade layer is The circumference can be arranged inside the pull ring.

In the medical sheath according to the present invention, the one end portion of the operation wire has a non-joint portion that is not joined to the inner surface of the pull ring on the tube proximal end side from the joint portion, and the one in the blade layer. A part of the end on the tube distal end side is provided with a cutout part in which a part of the pull ring in the circumferential direction is installed, and the tube distal end side of the blade layer corresponding to the cutout part is provided. An edge portion is inserted between the non-bonded portion of the operation wire and the inner surface of the pull ring.

In the present invention, in a part of the end portion of the blade layer on the tube distal end side, in a form in which a notch portion in which a part of the pull ring in the circumferential direction is provided is provided, the blade layer corresponding to the notch portion By inserting the edge portion of the tube on the distal end side thereof between the unbonded portion of the manipulation wire and the inner surface of the pull ring, the entire circumference of the end portion of the blade layer can be arranged inside the pull ring.

In the medical sheath of the present invention, an inner surface of the pull ring is inserted into a portion where the end portion of the blade layer on the tube distal end side is inserted between the pull ring and the non-joint portion of the operation wire. A configuration may be adopted in which a recess that accommodates at least a part of the thickness is formed.

According to this configuration, it is possible to prevent the distal end side end portion of the blade layer inserted between the non-joint portion of the manipulation wire and the inner surface of the pull ring from protruding to the inner surface side of the pull ring. Therefore, it is possible to prevent the blade layer from interfering with other members such as the wire lumen.

In the medical sheath according to the present invention, the joint portion of the operation wire is joined to the inner surface of the pull ring by brazing, and the pull ring is formed by joining the brazing material for brazing to the operation wire. It is characterized in that it has a brazing material damming portion that dams the flow from the portion side to the non-bonding portion side.

With this configuration, in the present invention, the molten brazing material attached to the joint portion of the operation wire is dammed by the brazing material damming portion, so that the brazing material flows from the bonding portion side of the manipulation wire to the non-bonding portion side. Can be prevented. Therefore, it is possible to reliably obtain a configuration in which only the joint portion of the operation wire is brazed to the inner surface of the pull ring, and the non-joint portion of the operation wire is not brazed to the inner surface of the pull ring.

In the medical sheath of the present invention, the brazing material damming portion may be formed by a through hole formed in the pull ring.

According to this structure, the brazing material retaining portion of the present invention can be easily provided by forming the through hole in the pull ring. The through hole suitably functions as the brazing material damming portion of the present invention.

In the medical sheath of the present invention, the through hole may be formed by a slit formed so as to extend along the circumferential direction of the pull ring.

According to this structure, the brazing material retaining portion of the present invention can be easily provided by forming the slit in the pull ring. The slit preferably fulfills its function as the brazing material damming portion of the present invention.

According to the present invention, it is possible to provide a medical sheath that can prevent the wire material of the blade layer from being exposed with a simpler configuration than conventional ones, and as a result can reduce the number of parts and the cost.

It is a top view of the medical sheath which concerns on one Embodiment of this invention. FIG. 2 is a sectional view taken along line II-II of FIG. 1. It is a III-III sectional view of FIG. 1 and FIG. FIG. 6 is a cross-sectional view taken along the line IV-IV of FIGS. 1 and 5. FIG. 5 is a sectional view taken along line VV of FIGS. 3 and 4. It is a figure for demonstrating the structure and effect|action of the operation part of the medical sheath which concerns on one Embodiment of this invention. FIG. 4 is a perspective view showing an end portion of the blade layer on the tube distal end side according to the embodiment of the present invention. It is a perspective view showing a pull ring and an operation wire (a 1st wire and a 2nd wire) concerning one embodiment of the present invention. It is a side view which shows the pull ring and operation wire (1st wire, 2nd wire) which concern on one Embodiment of this invention. 9A is a sectional view taken along line XA-XA in FIG. 9, FIG. 9B is a sectional view taken along line XB-XB in FIG. 9, and FIG. 9C is a sectional view taken along line XC-XC in FIG. It is a figure which shows the modification of one Embodiment of this invention, Comprising: It is a longitudinal cross-sectional view at the tube distal end side.

Embodiments of the present invention will be described below with reference to the drawings.

(One embodiment)
First, the configuration will be described.

FIG. 1 shows a medical sheath (hereinafter simply referred to as a sheath) 1 according to one embodiment. The sheath 1 includes a sheath main body 2 having a tube 20 as a main body, an operating portion 3, and a grip portion 4. The tube 20 has a tube distal end 20A on one end side that is inserted into the body when in use, and a tube proximal end 20B on the other end side that is arranged outside the body. An operation section 3 and a grip section 4 are provided at the tube proximal end 20B.

2, 3 and 4 are transverse cross-sectional views of the sheath body 2, showing a II-II cross section, a III-III cross section, and a IV-IV cross section in FIG. 1, respectively. Further, FIG. 5 is a vertical cross-sectional view of the tube distal end 20A in the sheath body 2, and shows the VV cross section in FIGS. 3 and 4.

As shown in FIGS. 2 to 5, the sheath body 2 according to the present embodiment has a tube 20 having one main lumen 23 and two wire lumens 21 and 22, and a circle provided at the tube distal end 20A. A joint part that is inserted into the annular pull ring 40 and the wire lumens 21 and 22 so as to be able to move forward and backward, and is joined to the inner surface of the pull ring 40 at one end portions 31F and 32F on the tube distal end 20A side thereof as described later. A first wire 31 and a second wire 32 each having 31a and 32a are provided. The 1st wire 31 and the 2nd wire 32 comprise the operation wire of the present invention.

The operation portion 3 is provided at the tube proximal end 20B. The operation part 3 is connected to the other ends of the first and second wires 31, 32 on the tube proximal end 20B side, respectively, as described later. The operation part 3 is configured to move the wires 31 and 32 forward and backward to displace the direction of the tube distal end 20A together with the pull ring 40 in the opposite direction of 180 degrees as indicated by arrows α and β in FIG. There is.

As shown in FIGS. 2 to 4, the tube 20 has one main lumen 23 and two wire lumens 21, 22 as described above, and further surrounds the main lumen 23 and the wire lumens 21, 22. It has a blade layer 24 arranged.

The tube 20 is composed of a multi-layer tube having an inner tube 23A and an outer tube 23B. The main lumen 23 is formed by the hollow inside of the inner tube 23A. The main lumen 23 is formed substantially coaxially with the central axis of the tube 20.

The outer tube 23B is provided with two wire lumens 21 and 22, that is, a first wire lumen 21 and a second wire lumen 22 at positions opposite to each other by about 180 degrees with respect to the central axis of the tube 20. There is.

The first wire lumen 21 is configured by the hollow inside of the first wire lumen tube 21A embedded in the outer tube 23B. The second wire lumen 22 is formed by the hollow inside of the second wire lumen tube 22A embedded in the outer tube 23B. Each wire lumen 21, 22 extends along the axial direction of the tube 20.

A first wire 31 is inserted into the first wire lumen 21 so as to be movable back and forth along the axial direction of the tube 20. A second wire 32 is inserted through the second wire lumen 22 so as to be able to move forward and backward along the axial direction of the tube 20. Each of the first and second wires 31 and 32 is a thin wire made of the same metal, and is made of, for example, a stranded wire or a single wire of a metal such as stainless steel.

As will be described later, the first wire 31 and the second wire 32 respectively have joint portions 31a and 32a at one end portions 31F and 32F on the tube distal end 20A side, and the joint portions 31a and 32a are The inner surfaces 40a of the pull rings 40 are respectively joined.

Further, as shown in FIG. 6, the other end portions of the first wire 31 and the second wire 32 on the tube proximal end 20B side are connected to the outer peripheral portion of the guide member 301 included in the operation portion 3, respectively. ..

In the operation unit 3, by rotating the two levers 302 shown in FIG. 6, one of the wires 31, 32 is moved to the tube proximal end 20B side by the guide member 301 corresponding to each wire 31, 32. It is drawn in, and following this, the other is drawn out from the tube proximal end 20B side. By the advancing/retreating motions of the wires 31 and 32 which are opposite to each other, the pull ring 40 moves as shown in FIG. 6B, and the tube distal end 20A is displaced in accordance with the movement of the pull ring 40. ing.

As shown in FIG. 2, the blade layer 24 is embedded in the outer tube 23B so as to come into contact with the outer peripheral portions of the inner tube 23A and the wire lumen tubes 21A and 22A. Therefore, the blade layer 24 has an elliptical annular cross section. The blade layer 24 is a reinforcing member formed by braiding a wire material such as stainless steel. The tube 20 is configured such that the blade layer 24 suppresses the occurrence of kinks and twists.

As shown in FIGS. 4 and 5, the pull ring 40 is installed so as to enclose the tube 20 and the blade layer 24 at the tube distal end 20A. Here, since the inner diameter of the pull ring 40 is smaller than the major axis of the blade layer 24, as shown in FIG. 7, the end portion 24A on the tube distal end 20A side of the blade layer 24 has a portion on the major axis side thereof. A pair of notches 24a are formed by cutting and removing. The pull ring 40 is installed at the tube distal end 20A such that a part of the pull ring in the circumferential direction is fitted into each cutout portion 24a.

As shown in FIG. 7, the end portion 24A of the blade layer 24 on the tube distal end 20A side has the cutout portions 24a, the two protrusions 24b between the cutout portions 24a, and the cutout portions. And two edge portions 24c corresponding to 24a. As will be described later, the entire circumference of the end portion 24A on the tube distal end 20A side including the convex portion 24b and the edge portion 24c is arranged inside the pull ring 40.

The pull ring 40 is made of metal such as stainless steel. A contrast ring made of a metal (eg, gold, platinum, iridium, or tungsten) that can be detected by X-rays or the like may be attached to the edge of the pull ring 40 on the tube distal end 20A side. Further, the pull ring 40 itself may be made of a metal that can be detected by X-rays or the like.

As shown in FIG. 5, the sheath body 2 has a distal end 50A on the tube distal end 20A side, and a substantially cylindrical distal end tip 50 that covers the tube distal end 20A and the pull ring 40. The tube distal end 20A and pull ring 40 are joined together by a tip 50. The distal tip 50 constitutes the distal end portion of the sheath body 2, and the distal end edge portion thereof is chamfered in an R shape to form a smooth surface.

Here, the materials of the inner tube 23A and the outer tube 23B, the first and second wire lumen tubes 21A and 22A, and the distal end tip 50 that constitute the above-mentioned tube 20 will be described.

The inner tube 23A has a hollow inner main lumen 23 into which, for example, an electrode catheter, an ablation catheter, a catheter for delivering a stent, a catheter for other purposes, or a guide wire or other medical device is axially movably inserted. It In addition, the first and second wire lumen tubes 21A and 22A have the first and second wire lumens 21 and 22 in the hollow interior thereof with the first and second wires 31 and 32 respectively, as described above. It is inserted so that it can move forward and backward along the direction.

For this reason, it is preferable that the inner tube 23A and the wire lumen tubes 21A and 22A are made of a resin having good sliding characteristics. Examples of such a resin include polytetrafluoroethylene (PTFE), tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene/hexafluoropropylene copolymer (FEP), tetrafluoroethylene/ethylene. A fluororesin such as a copolymer (ETFE) or polyvinylidene fluoride (PVDF) is suitable.

The outer tube 23B is made of, for example, a polyamide elastomer such as a polyether block amide copolymer, polyamide, polyimide, polyamide imide, polyethylene terephthalate, polyethylene, polypropylene, polyurethane, ethylene/vinyl acetate copolymer, or polyvinyl chloride. It is preferably formed of resin.

As shown in FIGS. 8 to 10, the first wire 31 inserted into the first wire lumen 21 and the second wire 32 inserted into the second wire lumen 22 are respectively the tube distal end 20A. The one end portions 31F and 32F on the side are housed in the pull ring 40.

The one end portion 31F of the first wire 31 has a joint portion 31a joined to the inner surface 40a of the pull ring 40 and a non-joint portion 31b not joined to the inner surface 40a. Similarly, the one end portion 32F of the second wire 32 has a joining portion 32a joined to the inner surface 40a of the pull ring 40 and a non-joining portion 32b not joined to the inner surface 40a.

The joint portions 31a and 32a of the first wire 31 and the second wire 32 are provided at the tip ends of the one end portions 31F and 32F, respectively, and a brazing material 60 is used as shown in FIG. 10(a). It is joined to the inner surface 40a of the pull ring 40 by brazing. The type of the brazing material 60 is appropriately selected according to the materials of the wires 31, 32 and the pull ring 40, and silver brazing or the like is used, for example.

As shown in FIGS. 8 to 10, the pull ring 40 has two slits for preventing the brazing material 60 from flowing from the joint portions 31a, 32a side of the wires 31, 32 to the non-joint portions 31b, 32b side, respectively. That is, it has a first slit 41 and a second slit 42. These slits 41 and 42 are through holes penetrating from the inside of the pull ring 40 to the outside, and are formed in a rectangular shape extending along the circumferential direction of the pull ring 40. Each slit 41, 42 constitutes the through hole and brazing material damming portion of the present invention.

The slits 41 and 42 are formed at positions opposite to each other by about 180 degrees with respect to the central axis of the pull ring 40. Further, the slits 41 and 42 are formed at positions in the middle of the pull ring 40 in the axial direction and slightly closer to the tube proximal end 20B side (right side in FIG. 9).

One end 31F of the first wire 31 is inserted into the pull ring 40 so as to traverse the first slit 41, and the melted brazing material 60 is attached to the joining portion 31a at the tip, so that the joining portion 31a is pulled into the pull ring 40. Is joined to the inner surface 40a. Similarly to this, the second wire 32 is inserted so that the one end portion 32F crosses the second slit 42 in the pull ring 40, and the molten brazing material 60 is attached to the joining portion 32a at the tip. The joining portion 32a is joined to the inner surface 40a of the pull ring 40. The wires 31 and 32 after joining are arranged so as to traverse the intermediate portions of the circumferential lengths of the slits 41 and 42, respectively.

The brazing material 60 tries to flow from the joints 31a and 32a to the tube proximal end 20B side along the wires 31 and 32 by the capillarity phenomenon. No flow occurs to the end 20B side. That is, each of the slits 41 and 42 prevents the molten brazing material 60 attached to the joints 31a and 32a from flowing toward the non-joint portions 31b and 32b.

In the present embodiment, the non-bonded portions 31b and 32b of the first wire 31 and the second wire 32 are portions facing the slits 41 and 42, respectively, and the slits 41 and 42 to the tube proximal end 20B. It is composed of a portion facing the inner surface 40a of the pull ring 40 on the side.

In the present embodiment, the entire circumference of the end portion 24A on the tube distal end 20A side of the blade layer 24, including the above-mentioned convex portions 24b and each edge portion 24c, is disposed inside the pull ring 40. There is. Here, each edge portion 24c on the tube distal end 20A side corresponding to each cutout portion 24a formed for installing the pull ring 40 shown in FIG. 7 is, as shown in FIG. The wires 31 and 32 are arranged inside the pull ring 40 while being inserted between the non-bonded portions 31 b and 32 b of the wires 31 and the inner surface 40 a of the pull ring 40.

Next, the operation will be described.

In the sheath 1 according to this embodiment, the entire circumference of the end portion 24A of the blade layer 24 on the tube distal end 20A side is arranged inside the pull ring 40 as described above. Particularly in the present embodiment, each edge portion 24c corresponding to each notch portion 24a formed in the blade layer 24 for installing the pull ring 40 has the non-bonded portions 31b and 32b of the wires 31 and 32 and the pull ring 40. The inner end portion 40A is inserted between the inner surface 40a and the other end portion 24A including the convex portion 24b, and is disposed inside the pull ring 40 while being embedded in the outer tube 23B.

According to the present embodiment, the edge portions 24c corresponding to the cutout portions 24a are formed between the non-bonded portions 31b and 32b of the first wire 31 and the second wire 32 and the inner surface 40a of the pull ring 40. By inserting, the entire circumference of the end portion 24A of the blade layer 24 including the edge portions 24c can be arranged inside the pull ring 40. Therefore, it is possible to prevent the wire material forming each edge portion 24c from being exposed to the outside. Therefore, in the sheath 1 according to the present embodiment, it is not necessary to install a conventional cover ring, and thus it is possible to prevent the wire rod of the blade layer 24 from being exposed with a simpler configuration than the conventional one, and as a result, the number of parts and cost are reduced. It is possible to reduce.

Further, in the present embodiment, the molten brazing filler metal 60 attached to the joints 31a and 32a of the wires 31 and 32 is formed by the slits 41 and 42 from the joints 31a and 32a side to the non-joint portions. It can be prevented from flowing toward the side of 31b, 32b. Therefore, only the joint portions 31a and 32a of the wires 31 and 32 are brazed to the inner surface 40a of the pull ring 40, and the non-joint portions 31b and 32b of the wires 31 and 32 are soldered to the inner surface 40a of the pull ring 40. It is possible to surely obtain the configuration that is not attached.

Further, in the present embodiment, the slits 41 and 42, which are through holes, are used as the brazing material damming portions of the present invention, but these slits 41 and 42 can be easily formed in the pull ring 40, and the brazing material of the present invention can be formed. It suitably fulfills its function as a material damming portion.

The brazing material 60 during brazing penetrates into the gap between the wires 31 and 32 and the inner surface 40a of the pull ring 40 due to its wettability, and spreads flare-shaped on both sides in the width direction of the wires 31 and 32. Therefore, each slit 41, 42 has a size such that the brazing material 60 attached to the joint portions 31a, 32a and spreading in this way can be dammed so as not to flow to the non-joint portions 31b, 32b. Is required.

Therefore, in order to sufficiently fulfill the function as the brazing material damming portion of the present invention, the size of each slit 41, 42 is, for example, 5 times the length along the circumferential direction of the diameter of each wire 31, 32. The size is about 6 times, and the width thereof is about 1 to 2 times the diameter of each wire 31, 32.

Specifically, when the diameter of each wire 31 and 32 is, for example, φ0.10 to 0.40 mm, the width of each slit 41 and 42 is preferably 0.05 to 0.16 mm, and 0.10 to 0. 80 mm is more desirable. The circumferential length of each slit 41, 42 is preferably 0.30 to 3.00 mm, more preferably 0.50 to 2.00 mm.

By having such dimensions, the slits 41, 42 are sufficient to prevent the brazing material 60 from flowing from the joint portions 31a, 32a side of the wires 31, 32 to the non-joint portions 31b, 32b side. Since it has a size, the function as the brazing material damming portion of the present invention is surely performed.

(Modification)
FIG. 11 shows a modification of the above-described embodiment.

This modification is different from the above-described embodiment in that a recess 45 is formed in a part of the inner surface 40a of the pull ring 40. Therefore, in this modified example, the same components as those in the above-described one embodiment are designated by the same reference numerals, and the description thereof will be omitted. Only differences from the above-described one embodiment will be described.

The respective edge portions 24c corresponding to the pair of cutout portions 24a of the blade layer 24 are inserted between the respective non-bonded portions 31b and 32b of the first wire 31 and the second wire 32 and the inner surface 40a of the pull ring 40. However, two recesses 45 for accommodating the respective edge portions 24c are formed on the inner surface 40a of the pull ring 40 where the edge portions 24c are disposed. These recesses 45 are open to the inner surface 40a side of the pull ring 40 and the tube proximal end 20B side.

According to this modification, the edge portions 24c of the blade layer 24 inserted between the non-bonded portions 31b and 32b of the wires 31 and 32 and the inner surface 40a of the pull ring 40 are accommodated in the recesses 45, respectively. By doing so, it is possible to prevent each edge portion 24 c from protruding to the inner surface 40 a side of the pull ring 40. Therefore, it is possible to prevent the edge portion 24c from interfering with other members such as the wire lumen tubes 21A and 22A.

Note that the depth of the recess 45 may be a depth in which at least a part of the thickness of the edge portion 24c, that is, the thickness of the blade layer 24 is accommodated, but the entire thickness of the edge portion 24c is the recess 45. More preferably, it is housed in.

In the above embodiment, each slit 41, 42 constitutes the brazing material damming portion of the present invention, but the brazing material damming portion of the invention is not limited to such slits 41, 42 and may have any shape. It may be configured by a through hole.

In addition to the through holes, if the brazing material 60 has a function of preventing the brazing material 60 from flowing from the joint portions 31a, 32a of the wires 31, 32 to the non-joint portions 31b, 32b, the brazing material damming portion is It may be of any form.

INDUSTRIAL APPLICABILITY The present invention is a medical sheath that can prevent the wire material of the blade layer from being exposed with a simpler configuration than conventional ones, and thus can reduce the number of parts and cost, and is useful for general medical sheaths.

1 medical sheath 2 sheath body 3 operation part 20 tube 20A tube distal end 20B tube proximal end 21 first wire lumen 22 second wire lumen 23 main lumen 24 blade layer 24A of the tube distal end side of the blade layer End 24a Cutout 24c Edge 31 First wire (operation wire)
31a, 32a Bonding parts 31b, 32b Non-bonding parts 31F, 32F One end part 32 Second wire (operation wire)
40 pull ring 40a inner surface of pull ring 41 first slit (brazing material damming portion, through hole)
42 Second slit (brazing material damming portion, through hole)
45 recess 60 brazing material

Claims (7)

A main lumen and a wire lumen, and a blade layer having an annular cross section arranged so as to surround the main lumen and the wire lumen, the tube distal end on one end side is inserted into the body, and the tube on the other end side A tube whose proximal end is located outside the body,
A pull ring provided at the distal end of the tube,
An operation wire that is inserted into the wire lumen so as to be able to move forward and backward, and has an operation wire that has a connection part that is connected to the inner surface of the pull ring at one end thereof,
The tube proximal end is provided with the other end of the operating wire connected thereto, and an operating section for displacing the direction of the tube distal end together with the pull ring by advancing and retracting the operating wire is provided,
The medical sheath, wherein an end of the blade layer on the tube distal end side is disposed inside the pull ring. The one end of the operation wire has a non-joint portion that is not joined to the inner surface of the pull ring on the tube proximal end side of the joint portion,
The part of the distal end of the tube in the blade layer is inserted between the unbonded portion of the manipulation wire and the inner surface of the pull ring. Medical sheath. The one end of the operation wire has a non-joint portion that is not joined to the inner surface of the pull ring on the tube proximal end side of the joint portion,
A part of an end of the blade layer on the tube distal end side is provided with a cutout part in which a part of the pull ring in the circumferential direction is installed, and the tube of the blade layer corresponding to the cutout part. The medical sheath according to claim 1, wherein an edge portion on the distal end side is inserted between the non-bonded portion of the manipulation wire and the inner surface of the pull ring. At least a part of the thickness of the pull ring is accommodated in a portion of the inner surface of the pull ring where the end portion of the blade layer on the tube distal end side is inserted between the pull ring and the unbonded portion of the manipulation wire. The medical sheath according to claim 2 or 3, wherein a recess is formed. The joint portion of the operation wire is joined to the inner surface of the pull ring by brazing,
The pull ring has a brazing material damming-up portion that dams the brazing material for brazing from flowing from the joining portion side to the non-joining portion side of the operation wire. The medical sheath described in Crab. The medical sheath according to claim 5, wherein the brazing material damming portion is formed of a through hole formed in the pull ring. The medical sheath according to claim 6, wherein the through hole is formed of a slit formed so as to extend along the circumferential direction of the pull ring.

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