CN110339454A - Urinary catheter device with sheath - Google Patents

Abstract

The present invention relates to a kind of catheter assembly with sheath, especially a kind of catheter assembly of single type sheath.Catheter assembly of the invention, comprising: catheter is reelability hollow pipe fitting, and the catheter includes input unit and output section, and the input site is located at the second end E2 of the catheter in the first end E1 of the catheter, the output section；And sheath, ring are located at the outer peripheral surface of the catheter, and slideably move between the first end E1 and the second end E2.

Description

Urinary catheter device with sheath

technical field

The present invention relates to a urinary catheter device with a sheath, in particular to a one-piece sheathed urinary catheter device.

Background technique

Some patients are unable to urinate on their own, or have problems with urination disorders. After evaluation by a physician, they need to use a catheter to help the urine drain.

Well-known catheter devices include a catheter and a sleeve. The catheter has a first end, a second end and a catheterization channel, and the wall surface of the catheter is provided with at least one hole near the first end, and the hole is connected to the catheterization channel inside the catheter. Connected. The first end of the catheter is closed. The second end of the catheter is inserted into the sleeve and an opening is opened. The catheterization channel of the catheter communicates with the shaft hole of the sleeve through the opening of the second end of the catheter. In use, the user must pinch the catheter with fingers, insert the first end of the catheter into the urethra, and then insert the catheter into the bladder through the urethra to open the urethral sphincter. The patient's urine will sequentially pass through the catheter's hole, catheter channel, opening, and sleeve's shaft hole, and then drain into an appropriate container. A typical urinary system patient may need to empty his bladder every two to four hours. In developing countries, catheters are single-use (ie, not reused) because patients need to use the catheter multiple times a day.

However, this catheter device does not have any hygiene measures, so that the catheter may suffer to a certain extent due to incomplete hand cleaning or other parts of the body touching the catheter when using the catheter. pollution. Therefore, this type of use may have more than one negative effect. On the one hand, the urinary system may be infected due to the use of unsanitary catheters, and on the other hand, it may lead to inappropriate medical conditions. For example, under normal circumstances, the user needs to wear gloves to operate the catheter. If the user directly touches and operates the catheter without gloves in order to save the trouble, the user must confirm the cleanliness of his hands and the opening of the urethra to ensure that the catheter is not contaminated and reduce the possibility of urinary tract infection. The second negative is that because a hygienic catheter must be ensured each time it is used, the catheter is designed for single use and must be discarded after use, and a brand new catheter is used the next time it is needed. Therefore, it is necessary for patients to carry such a slender urinary catheter that is bulky, difficult to hide, and easy to find when discarded, which reduces the patient's willingness to use and increases the follow-up social medical cost.

In the market, there is a urinary catheter device, which includes a urinary catheter, a housing and a sanitary sheath. The urinary catheter can be accommodated in the housing, which reduces the volume and is easy to carry. The housing has an outlet through which the catheter can be withdrawn. The sanitary sheath includes a removing part and a sliding part. The removing part is removably connected to the sliding part. When in use, the removing part is removed, and the sliding part is held to operate the sanitary sheath. The sanitary sheath is sheathed on the urinary catheter, and the removal part covers the urinary catheter for connecting the first end of the urethra to isolate external pollution. In other words, the sanitary sheath completely covers the first end of the urinary catheter and its adjacent parts, which can avoid touching the first end of the urinary catheter during the process of unpacking the urinary catheter device. After unpacking, the user can carefully remove and discard the removal portion of the sanitary sheath from the first end of the catheter, leaving the first end of the catheter exposed. Next, grasp the housing with one hand, and hold the sliding portion of the sanitary sheath with the fingers of the other hand to slide it along the urinary catheter. After the catheter is lubricated, the sliding portion of the sanitary sheath ensures that the patient can operate and control the catheter without directly touching the catheter, improving the aforementioned problems of well-known catheter devices.

However, for the sanitary sheath having the removing part and the sliding part, the removing part must be removed before use, which increases the operation procedure of the user. Moreover, if the user's hand does not hold the sliding part of the sanitary sheath and the removal part is removed, it is easy to remove the sliding part together, and the original function of the sanitary sheath is lost instead.

SUMMARY OF THE INVENTION

Based on the above reasons, a main object of the present invention is to provide a catheter with a sheath, which comprises: a catheter, which is a windable hollow tube, the catheter includes an input part and an output part, the catheter The input part is located at the first end E1 of the urinary catheter, the output part is located at the second end E2 of the urinary catheter; and a sheath is arranged on the outer peripheral surface of the urinary catheter, and is slidable move between the first end E1 and the second end E2.

According to an embodiment of the present invention, it further comprises a hollow cushion, which is detachably sleeved on the output part of the urinary catheter.

According to an embodiment of the present invention, it further includes an anti-fouling sleeve, the anti-fouling sleeve is fixed on the output part of the urinary catheter, and the anti-fouling sleeve covers the urinary catheter and the sheath outside.

According to an embodiment of the present invention, the sheath is connected with a protrusion protruding in the radial direction of the sheath, and the inner diameter of the sheath is larger than the inner diameter of the urethral orifice.

According to an embodiment of the present invention, the width of the sheath with the protrusion is larger than the inner diameter of the urethral orifice.

According to an embodiment of the present invention, the protruding portion is a plurality of block-shaped protrusions protruding inward from the radial direction of the sheath, and the plurality of block-shaped protrusions abut against the outer peripheral surface of the urinary catheter .

According to an embodiment of the present invention, the protruding portion is plate-shaped and protrudes outward from the radial direction of the sheath.

According to an embodiment of the present invention, the protruding portion has a first operating portion and a second operating portion, protruding outward from a radial direction of the sheath, and the first operating portion and the second operating portion extend from The urinary catheter extends outward in the radial direction and is covered with the sheath surrounding the urinary catheter, and the first operating portion is fitted to the second operating portion.

According to an embodiment of the present invention, the protruding portion protrudes outward from the radial direction of the sheath, one end of the protruding portion is coaxially fixed to the sheath, and the other end of the protruding portion is fixed to the sheath. The inner diameter _D3 is larger than the inner diameter D1 _of the sheath.

According to an embodiment of the present invention, the protruding portion is a strip-shaped member protruding outward from a radial direction of the sheath, and both ends of the strip-shaped member are respectively attached to both ends of the sheath And extending outward from the radial direction of the urinary catheter, the strip-shaped member and the sheath surround to form an accommodating space.

According to an embodiment of the present invention, the protruding portion protrudes outward from the radial direction of the sheath, and has a surrounding portion, a fixing portion and an extending moving portion, and the fixing portion and the extending moving portion are fixedly connected to The end of the surrounding portion, wherein the surrounding portion surrounds the sheath, and the extending moving portion passes through and is engaged with the fixing portion to protrude toward the side of the sheath, and drives the surrounding The portion is bundled with the sheath.

According to an embodiment of the present invention, the protruding portion is integrally formed on the outer peripheral surface of the sheath.

The effect of invention

A main objective of the present invention is to provide a urinary catheter with a sheath, the sheath is one-piece, and the operation is easier for the user.

Another object of the present invention is to provide a catheter with a sheath, the inner peripheral surface of the hollow sleeve of the sheath has a plurality of block-shaped protrusions, and the plurality of block-shaped protrusions abut against the The outer peripheral surface of the urinary catheter reduces the friction force between the sheath and the urinary catheter, so that the sheath can easily slide from either end of the urinary catheter during use.

Another object of the present invention is to provide a catheter with a sheath, the catheter and the sheath are covered by the antifouling sheath, so as to prevent the catheter and the Contamination of the sheath during use.

Another object of the present invention is to provide a catheter with a sheath, the width of the sheath passing through the protruding portion is greater than the inner diameter of the urethral orifice, so as to prevent the sheath from sliding down to the urethra when the catheter is in use in the user's urethra.

Another object of the present invention is to provide a urinary catheter with a sheath, and the user moves the sheath through the protruding portion, thereby facilitating the user to operate the urinary catheter.

Description of drawings

1 is a perspective view of a catheter device with a sheath according to a first embodiment of the present invention;

Fig. 2 is an exploded view of the urinary catheter device of Fig. 1;

Figure 3 is a schematic view of a sheath of the urinary catheter device of Figure 1;

Fig. 4 is the use state schematic diagram of the urinary catheter device of Fig. 1;

5 is a perspective view of a catheter device with a sheath according to a second embodiment of the present invention;

Fig. 6 is the use state schematic diagram of the urinary catheter device of Fig. 5;

7 is a schematic diagram of a sheath of a urinary catheter device according to a third embodiment of the present invention;

8 is a schematic diagram of a sheath of a urinary catheter device according to a fourth embodiment of the present invention;

9 is a schematic diagram of a sheath of a urinary catheter device according to a fifth embodiment of the present invention;

10 is a schematic diagram of the sheath of the urinary catheter device according to the sixth embodiment of the present invention;

11 is a schematic diagram of a sheath of a urinary catheter device according to a seventh embodiment of the present invention.

Among them, the reference numerals are described as follows:

100 Urinary Catheter Sets

110 Urinary catheter

112 Input section

114 Output section

115 openings

120 sheath

122 block protrusions

124 Protrusions

1242 The first operation part

1244 Second Operation Section

1245 accommodating space

1246 Surround

1247 Fixed part

1248 Extended moving part

130 Hollow Upholstery

140 Antifouling Sleeve

200 Urinary Catheter Sets

300 Catheter Set

400 Catheter Set

500 Catheter Set

600 Catheter Set

700 Catheter Set

A Arrow direction

A ₁ Arrow direction

D ₁ inner diameter

D ₂ outer diameter

D ₃ inner diameter

E1 first end

E2 second end

U user

Detailed ways

The embodiments of the present invention will be described in more detail below with reference to the drawings and component symbols, so that those skilled in the art can implement them after studying the description.

FIG. 1 is a perspective view showing a catheter device with a sheath according to a first embodiment of the present invention. As shown in FIG. 1 , the catheter device 100 with a sheath provided by the present invention includes a catheter 110 , a sheath 120 , and a hollow cushion 130 . The urinary catheter 110 is a windable hollow tube, including a first end E1 and a second end E2 , and the first end E1 of the urinary catheter 110 has at least one opening 115 . The sheath 120 has a hollow sleeve, the hollow sleeve is arranged around the outer peripheral surface of the urinary catheter 110 , the inner diameter D ₁ of the sheath 120 is larger than the outer diameter D ₂ of the urinary catheter 110 , The sheath 120 is slidably moved between the first end E1 and the second end E2 of the urinary catheter 110 .

FIG. 2 is an exploded view showing the urinary catheter device of FIG. 1 . As shown in FIG. 2 , in the urinary catheter device 100 , the urinary catheter 110 includes an input part 112 and an output part 114 . The input portion 112 is located at the first end E1 of the urinary catheter 110 . The input portion 112 extends from the axis of the urinary catheter 110 to form a cambered cone shape, or may extend on the axis of the urinary catheter 110 and gradually taper inward toward the input portion 112 . shape, so as to use the input portion 112 to enter the urethra through the urethral orifice of the user U, and extend into the bladder. The input portion 112 has at least one opening 115 disposed around the first end E1 of the urinary catheter 110 for allowing the urine of the user U to enter the urinary catheter through the opening 115 of the input portion 112 110. The output part 114 is located at the second end E2 of the urinary catheter 110, and can guide urine from the first end E1 to the second end E2 of the urinary catheter 110 in the direction of the arrow A, and through the The opening of the output portion 114 is discharged. The hollow cushion 130 can be correspondingly sleeved on the output portion 114 of the urinary catheter 110 , so as to be detachably sleeved on the output portion 114 of the urinary catheter 110 . The hollow cushion 130 is an elastic fixing member, which can be connected with a corresponding suitable sanitary container (not shown in the figure), such as a urine bag or other suitable sanitary container. Since the output part 114 of the urinary catheter 110 is fixedly connected to the sanitary container through the hollow soft pad 130 , the unintended leakage of urine into the surrounding environment is avoided, resulting in environmental pollution. The weight of the output portion 114 with the hollow cushion 130 sleeved is greater than that of the input portion 112 with the sheath 120 sleeved, so that it is convenient for the user U to connect the output portion 114 to a suitable sanitary container .

The inner peripheral surface of the sheath 120 has a plurality of block-shaped protrusions 122, the plurality of block-shaped protrusions 122 abut against the outer peripheral surface of the urinary catheter 110, and the plurality of block-shaped protrusions 122 are lowered and lowered to the surface. The frictional force of the outer peripheral surface of the urinary catheter 110, especially the inner peripheral surface of the sheath 120, can be added with lubricating oil, so that the sheath 120 can easily slide from either end of the urinary catheter 110 during use. The hollow sleeve can also form a rough surface with block-like protrusions 122 on the inner peripheral surface by means of sanding, sand engraving, etc. The rough surface can increase the contact area with the outer peripheral surface of the catheter 110, thereby The sheath 120 is not easy to fall off from the urinary catheter 110 during use. The plurality of block-shaped protrusions 122 may be regularly formed on the inner peripheral surface of the sheath 120 , and the regular arrangement of the plurality of block-shaped protrusions 122 may be the inner peripheral surface and part of the entire hollow sleeve sheath 120 . A plurality of block-shaped protrusions 122 arranged in a straight line, a plurality of block-shaped protrusions 122 arranged in a diagonal line, a plurality of block-shaped protrusions 122 arranged in a horizontal stripe, and a plurality of blocks arranged in a specific pattern and the plurality of block-shaped protrusions 122 may be irregularly formed on the inner peripheral surface of the sheath 120, for example, the plurality of block-shaped protrusions 122 are randomly distributed to form the sheath 120 inner perimeter. The plurality of block-shaped protrusions 122 can also be disposed on the outer peripheral surface of the sheath 120 to facilitate the user's holding. The outer peripheral surface of the sheath 120 may have at least one groove (not shown), the at least one groove may be irregularly arranged around the outer peripheral surface, and the at least one groove may face the sheath. The sleeve 120 may be disposed radially outward, so that the user can easily hold the sheath 120, or the at least one groove can be disposed radially inward toward the sheath 120, so as to facilitate the user to hold the sheath 120 easily. In addition, the problem of the sheath 120 falling off relative to the urinary catheter 110 can also be prevented.

FIG. 3 is a schematic diagram showing a sheath of the urinary catheter device of FIG. 1 . As shown in FIG. 3 , in the catheter device 100, the inner peripheral surface of the hollow sleeve of the sheath 120 includes a plurality of block-shaped protrusions 122, and the plurality of block-shaped protrusions 122 are located in the sheath. The sleeve 120 extends inward in the radial direction and abuts against the outer peripheral surface of the urinary catheter 110 . The surfaces of the plurality of block-shaped protrusions 122 preferably have a rough surface by means of sanding, sand engraving, or the like.

FIG. 4 is a schematic diagram showing the use state of the urinary catheter device of FIG. 1 . As shown in FIG. 4 , in the urinary catheter device 100 , the sheath 120 is located at the position of the input portion 112 of the urinary catheter 110 , when the user U holds the sheath 120 with one hand , push the sheath 120 toward the arrow direction A1 by fingers to move the sheath 120 toward the second end E2 of the catheter 110, so that at least _one opening of the input part 112 is exposed, and the The input 112 is advanced toward the urethral opening and through the urethra into the bladder.

5 is a perspective view showing a catheter device with a sheath according to a second embodiment of the present invention. As shown in FIG. 5 , the urinary catheter device 200 further includes an antifouling cover 140 , and the antifouling cover 140 is fixed on the output portion 114 of the urinary catheter 110 through the hollow cushion 130 , or directly The antifouling cover 140 is arranged on the output part 114 , and the antifouling cover 140 can be wrapped outside the urinary catheter 110 and the sheath 120 , or close to the urinary catheter 110 . The antifouling sleeve 140 at one end E1 is disposed between the urinary catheter 110 and the sheath 120 (not shown in the figure), and the antifouling sleeve 140 is located on the input portion 112 of the urinary catheter 110 . One end may be in a sealed shape.

FIG. 6 is a schematic diagram showing the use state of the urinary catheter device of FIG. 5 . As shown in FIG. 6 , in the catheter device 200, when the user U holds the sheath 120 with _one hand, the user U pushes the sheath 120 in the direction of the arrow A1 with his fingers to make the sheath 120 The sleeve 120 moves toward the second end E2 of the urinary catheter 110. During the pushing process of the user U, the antifouling sleeve 140 covers the urinary catheter 110 and the sheath 120, and The part of the urinary catheter 110 that is not surrounded by the sheath 120 is separated from the part of the urinary catheter 110 that the user U's hand touches, so as to prevent the user U's hand from touching the urinary catheter 110 when the input portion 112 is extended into the urethra. Contamination of the catheter by touching other parts of the catheter.

7 is a schematic diagram showing a sheath of a urinary catheter device according to a third embodiment of the present invention. 8 is a schematic diagram showing a sheath of a urinary catheter device according to a fourth embodiment of the present invention. 9 is a schematic diagram showing a sheath of a urinary catheter device according to a fifth embodiment of the present invention. 10 is a schematic diagram showing a sheath of a urinary catheter device according to a sixth embodiment of the present invention. 11 is a schematic diagram showing a sheath of a urinary catheter device according to a seventh embodiment of the present invention.

As shown in FIGS. 7-11 , the sheath 120 includes a protruding portion 124, and the sheath 120 is connected with the protruding portion 124 protruding in the radial direction of the sheath 120, especially protruding outward in the radial direction, so as to Solve the problem that the sanitary sheath is not easy to hold. Moreover, the width of the sheath 120 with the protruding portion 124 is larger than the inner diameter of the urethral orifice, so as to prevent the sheath 120 from being inserted into the urethral orifice due to the user's careless operation.

In addition, the protruding portion 124 of the sheath 120 may be a protruding portion 124 protruding outward in the radial direction of the sheath 120 or a plurality of block protrusions 122 protruding inward in the radial direction of the sheath 120 , or a combination of the two.

As shown in FIG. 7 , in the catheter device 300 , the protruding portion 124 is plate-shaped, extends outward from the radial direction of the sheath 120 and is fixed to the outer peripheral surface of the sheath 120 . The plate-shaped protruding portion 124 is preferably integrally formed with the sheath 120 , and the plate-shaped protruding portion 124 may also be fixed to the sheath 120 through a common snap mechanism or locking mechanism. the outer periphery. The hand of the user U can move the sheath 120 relative to the urinary catheter 110 by holding the plate-shaped protrusion 124 .

As shown in FIG. 8 , in the catheter device 400, the protruding portion 124 has a first operating portion 1242 and a second operating portion 1244, and the first operating portion 1242 and the second operating portion 1244 The urinary catheter 110 extends outward in the radial direction and is wrapped around the sheath 120 surrounding the urinary catheter 110 , and the first operating portion 1242 is fitted to the second operating portion 1244 . The first operating portion 1242 and the second operating portion 1244 are preferably integrally formed with the sheath 120 . The fingers of the user U can respectively hold the first operation part 1242 and the second operation part 1244 to move the sheath 120 relative to the urinary catheter 110 .

As shown in FIG. 9, in the catheter device 500, one end of the protruding portion 124 is coaxially fixed to the sheath 120, and the inner diameter _D3 of the other end of the protruding portion 124 is larger than that of the sheath The inner diameter D ₁ of the sleeve 120 and the protruding portion 124 form a hollow trumpet shape. The hollow trumpet-shaped protrusion 124 is preferably integrally formed with the sheath 120 . When the hand of the user U holds the protruding portion 124 , the movement of the protruding portion 124 on the axis of the urinary catheter 110 will jointly drive the movement of the sheath 120 .

As shown in FIG. 10 , in the urinary catheter device 600, the protruding portion 124 is a strip-shaped member, and both ends of the strip-shaped member are respectively attached to both ends of the sheath 120 and extend from the catheter. The radial direction of the urinary catheter 110 extends outward, and the strip-shaped member and the sheath 120 surround to form an accommodating space 1245 . The fingers of the user U can extract the catheter 110 with the sheath 120 through the strip-shaped member and the accommodating space 1245, and can pass the catheter 110 on the axis of the catheter 110 according to the user's needs The movement of the strip-shaped member also drives the movement of the sheath 120 .

As shown in FIG. 11 , in the catheter device 700 , the protruding portion 124 has a surrounding portion 1246 , a fixing portion 1247 and an extending moving portion 1248 , and the fixing portion 1247 and the extending moving portion 1248 are fixedly connected to each other. The end of the surrounding portion 1246 , wherein the surrounding portion 1246 surrounds the sheath 120 , and the extending moving portion 1248 passes through and engages with the fixing portion 1247 and protrudes toward the side of the sheath 120 , and drive the surrounding portion 1246 to be bundled with the sheath 120 . When the hand of the user U holds the extending moving part 1248, the extending moving part 1248 will drive the surrounding part 1246 surrounding the sheath 120 along the catheterization according to the user's needs The axis of the tube 110 slidably moves the sheath 120 .

Regarding the above embodiments, the anti-fouling sleeve 140 may be covered on the sheath 120 with different shapes of the protrusions 124 , or the anti-fouling sleeve 140 may have corresponding protrusions 124 with different shapes. Open to expose the protrusions 124 .

The main feature of the present invention is that the sheath of the urinary catheter is one piece, so the operation is easier for the user. In addition, the plurality of block-shaped rough surfaces on the inner peripheral surface of the hollow sleeve of the sheath come into contact with the outer peripheral surface of the urinary catheter, thereby lowering the sheath from the surrounding surface. friction between the catheters so that the sheath easily slides from either end of the catheter when in use. In addition, in the present invention, the antifouling cover is used to cover the urinary catheter and the sheath, thereby preventing the urinary catheter and the sheath from being polluted during use. In addition, according to the present invention, the width of the sheath of the protruding portion is larger than the inner diameter of the urethral opening, thereby preventing the sheath from slipping into the user's urethra when the urinary catheter is in use. Furthermore, the sheath of the present invention has a protruding portion through which the user moves the sheath, thereby facilitating the user to operate the urinary catheter.

The above descriptions are only used to explain the preferred embodiments of the present invention, and are not intended to limit the present invention in any form. All should still be included in the intended protection scope of the present invention.

Claims (10)

1. A urinary catheter device (100), characterized in that, comprising: The urinary catheter (110) is a windable hollow tube, the urinary catheter includes an input part (112) and an output part (114), and the input part (112) is located at the first part of the urinary catheter (110). one end (E1), the output (114) is located at the second end (E2) of the catheter (110); and The sheath (120) is annularly arranged on the outer peripheral surface of the urinary catheter (110), and is slidably moved between the first end (E1) and the second end (E2). 2 . The urinary catheter device according to claim 1 , further comprising a hollow cushion ( 130 ) detachably sleeved on the output portion ( 114 ) of the urinary catheter ( 110 ). 3 . 3. The urinary catheter device according to claim 1, further comprising an antifouling sleeve (140), the antifouling sleeve (140) being fixed on the output portion ( 114), and the antifouling cover (140) is wrapped outside the catheter (110) and the sheath (120). 4. The catheter device according to claim 1, wherein the sheath (120) is connected with a protrusion (124) protruding in the radial direction of the sheath (120), and the sheath (120) is The inner diameter of (120) is larger than the inner diameter of the urethral opening. 5. The urinary catheter device according to claim 4, wherein the protruding portion (124) is a plurality of block-like protrusions (122) protruding inward from the radial direction of the sheath (120). , the plurality of block-shaped protrusions (122) are in contact with the outer peripheral surface of the urinary catheter (110). 6. The catheter device according to claim 4, wherein the protrusion (124) protrudes outward from the radial direction of the sheath (120) and has a first operating portion (1242) and the second operation part (1244), the first operation part (1242) and the second operation part (1244) extend outward from the radial direction of the urinary catheter (110) and are wrapped around the In the sheath (120) of the urinary catheter (110), the first operation part (1242) is fitted to the second operation part (1244). 7. The catheter device according to claim 4, wherein the protrusion (124) protrudes outward from the radial direction of the sheath (120), one end of the protrusion (124) It is coaxially fixed to the sheath (120), and the inner diameter (D ₃ ) of the other end of the protrusion (124) is larger than the inner diameter (D ₁ ) of the sheath (120). 8. The catheter device according to claim 4, wherein the protruding portion (124) is a strip-shaped member, protruding outward from the radial direction of the sheath (120), the strip-shaped part Both ends of the member are respectively attached to both ends of the sheath (120) and extend outward from the radial direction of the catheter (110), and the strip-like member is connected to the sheath (120). ) around to form an accommodating space (1245). 9. The catheter device according to claim 4, wherein the protrusion (124), protruding outward from the radial direction of the sheath (120), has a surrounding portion (1246), a fixed portion A part (1247) and an extending moving part (1248), the fixed part (1247) and the extending moving part (1248) are fixed on both ends of the surrounding part (1246), wherein the surrounding part (1246) a A portion (1246) is bundled to the sheath (120). 10. The catheter device according to claim 4, wherein the protruding portion (124) is plate-shaped and protrudes outward from the radial direction of the sheath (120).