JPWO2019049954A1 - Urethral catheter - Google Patents

Abstract

Provided is a urethral catheter that can reduce the pain felt by the patient during insertion and removal. A catheter body 2 consisting of a flexible tube having a tip and a base opposite to the tip placed in the patient's bladder, and urine formed in the catheter body 2 to guide urine in the patient's bladder to the outside of the body. The discharge lumen 11 is formed so as to extend along the urine discharge lumen 11 so that the tip side is closed in the catheter body 2, and is formed on the peripheral surface 31 of the catheter body 2 in the radial cross-sectional view of the catheter body 2. A urinary tract catheter is provided that includes a flat deformed lumen 13 along the line.

Description

The present invention relates to a urethral catheter.

Conventionally, a urethral catheter is known as a medical device for assisting urination in a patient who has difficulty in urinating.

For example, Patent Document 1 discloses a urethral catheter including a rod-shaped catheter body, a balloon portion formed at one end of the catheter body, and an operating portion formed at the other end of the catheter body.

The urethral catheter of Patent Document 1 is used, for example, by performing the following processes (1) to (4) in this order.
(1) Disinfect the area around the external urethral meatus of the penis with a cotton ball or the like soaked with a disinfectant solution such as povidone iodine.
(2) Open the packaging of the urethral catheter and apply a water-soluble lubricant to the urethral catheter.
(3) Carefully insert the urethral catheter through the external urethral meatus. After the balloon part reaches the inside of the bladder, a specified volume of sterile water is slowly injected into the balloon part.
(4) The urethral catheter is slightly pulled and indwelled until the balloon part contacts the bladder neck.

Japanese Patent No. 5318925

When inserting and removing the urethral catheter, the patient may experience considerable pain as the catheter moves within the very narrow urethra.

An object of the present invention is to provide a urethral catheter that can reduce the pain felt by a patient during insertion and removal.

The urinary tract catheter of the present invention is formed in a catheter body composed of a flexible tube having a tip portion and a base opposite to the tip portion placed in the patient's bladder, and urine in the patient's bladder formed in the catheter body. A urine drainage lumen for guiding to the outside of the body and a flat shape formed in the catheter body extending along the urine drainage lumen and along the peripheral surface of the catheter body in a radial cross-sectional view of the catheter body. Includes deforming lumens.

In the urethral catheter of the present invention, the deformation lumen may be formed in a flat shape curved along the peripheral surface of the catheter body in a radial cross-sectional view of the catheter body.

In the urinary tract catheter of the present invention, the deformable lumen has an outer surface close to the peripheral surface of the catheter body and an inner surface facing the outer surface, and the length L ₂ of the inner surface of the deformable lumen is L _2. There may be longer than the length L ₁ of the outer surface.

In the urinary tract catheter of the present invention, the lumen for urine discharge may be formed in an elliptical shape with the direction along the longitudinal direction of the lumen for deformation as the major axis in the radial cross-sectional view of the catheter body.

In the urinary tract catheter of the present invention, the deforming lumen is one end thereof on a radial line segment of a fan-shaped region having a central angle of 90 ° or less extending from the center of the urine draining lumen in a radial cross-sectional view of the catheter body. And may have the other end.

In the urethral catheter of the present invention, the catheter body may have a constant outer diameter from the base to the tip.

In the urethral catheter of the present invention, the outer diameter of the catheter body may be 2 mm to 10 mm.

The urethral catheter of the present invention is provided on the distal end side of the catheter body, and is provided along the urine drainage lumen in the catheter body so as to communicate with the balloon portion that inflates in the patient's bladder and the balloon portion. It may further include a liquid introduction lumen for introducing the expansion liquid into the balloon portion.

In the urethral catheter of the present invention, the deformation lumen may be arranged so as to face the liquid introduction lumen with the urine discharge lumen interposed therebetween.

The urinary tract catheter of the present invention is provided on the distal end side of the catheter body and further includes a balloon portion that inflates in the bladder of the patient, and the deforming lumen is inside the catheter body so as to communicate with the balloon portion. It may also serve as a liquid introduction lumen for introducing an expansion liquid into the balloon portion, which is formed so as to extend along the urine discharge lumen.

In the urinary tract catheter of the present invention, the deformation lumen is different from the first deformation lumen which also serves as the liquid introduction lumen and the first deformation lumen, and the tip end side of the catheter body is closed. It may also include a second deformation lumen.

In the urethral catheter of the present invention, the first deformation lumen and the second deformation lumen may be arranged so as to face each other with the urine discharge lumen in between.

According to the urinary tract catheter of the present invention, since the flat-shaped deformation lumen is formed, the inner surfaces of the deformation lumen can be brought into close contact with each other by drawing air in the deformation lumen to create a negative pressure. .. As a result, a part of the catheter body can be compressed, so that the outer diameter of the catheter body can be reduced. As a result, the pain felt by the patient when the urethral catheter is inserted can be reduced.

FIG. 1 is a diagram showing a usage state of a urethral catheter according to an embodiment of the present invention, showing a state in which the balloon is not inflated in the bladder. FIG. 2 is a diagram showing a usage state of the urethral catheter according to the embodiment of the present invention, showing a state in which the balloon is inflated in the bladder. FIG. 3 is a plan view of the urethral catheter according to the embodiment of the present invention. FIG. 4 is a side view of the urethral catheter according to the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the VV cutting line of FIG. FIG. 6 is an enlarged view of the portion surrounded by the alternate long and short dash line VI of FIG. 5, and is a diagram showing a state in which the balloon is not used. FIG. 7 is an enlarged view of the portion surrounded by the alternate long and short dash line VI of FIG. 5, and is a diagram showing a balloon usage state. FIG. 8 is an enlarged view of the portion surrounded by the alternate long and short dash line VIII of FIG. FIG. 9 is an enlarged view of the portion surrounded by the alternate long and short dash line IX in FIG. FIG. 10 is a diagram showing the positional relationship between the first urine outlet and the second urine outlet. FIG. 11 is a cross-sectional view taken along the line of XI-XI in FIG. 3, showing a state in which the shape of the catheter body is uncompressed. FIG. 12 is a cross-sectional view taken along the line of XI-XI in FIG. 3, showing a state in which the shape of the catheter body is compressed. FIG. 13 is a diagram showing a modified example of the catheter body, showing a state in which the shape of the catheter body is uncompressed. FIG. 14 is a diagram showing a modified example of the catheter body, showing a state in which the shape of the catheter body is compressed. FIG. 15 is a diagram showing a modified example of the catheter body, showing a state in which the shape of the catheter body is uncompressed. FIG. 16 is a diagram showing a modified example of the catheter body, showing a state in which the shape of the catheter body is compressed. FIG. 17 is a diagram showing a modified example of the catheter body, showing a state in which the shape of the catheter body is uncompressed. FIG. 18 is a perspective view for explaining the characteristics of the shape of the balloon of the urethral catheter according to the embodiment of the present invention. FIG. 19 is a perspective view for explaining the characteristics of the shape of the balloon of the urethral catheter according to the embodiment of the present invention. FIG. 20 is a cross-sectional view for explaining the characteristics of the shape of the balloon of the urethral catheter according to the embodiment of the present invention. FIG. 21 is a diagram for explaining the effect of the urethral catheter according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing a usage state of the urethral catheter 1 according to the embodiment of the present invention, showing a state in which the balloon 4 is not inflated in the bladder. FIG. 2 is a diagram showing a usage state of the urethral catheter 1 according to the embodiment of the present invention, showing a state in which the balloon 4 is inflated in the bladder.

The urethral catheter 1 is an instrument for assisting urinary catheterization of a patient who has difficulty in urinating, and includes a catheter main body 2, an operation unit 3, and a balloon 4. As shown in FIG. 1, it is used by inserting the catheter body 2 into the urethra 8 of the human body 6 until the tip 5 reaches the bladder 7 of the human body 6 with the balloon 4 uninflated. After insertion, the balloon 4 is inflated and fixed to prevent the catheter body 2 from falling off, and the catheter body 2 is placed in the bladder 7.

Then, the urine 10 accumulated in the bladder 7 is discharged from the operation unit 3 through the inside of the catheter body 2 from the first urine discharge port 9 formed at the tip portion 5 of the catheter body 2.

Next, the configuration of the urethral catheter 1 according to the embodiment of the present invention will be described more specifically.

FIG. 3 is a plan view of the urethral catheter 1 according to the embodiment of the present invention. FIG. 4 is a side view of the urethral catheter 1 according to the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the VV cutting line of FIG. FIG. 6 is an enlarged view of the portion surrounded by the alternate long and short dash line VI of FIG. 5, and is a diagram showing a state in which the balloon 4 is unused. FIG. 7 is an enlarged view of the portion surrounded by the alternate long and short dash line VI of FIG. 5, and is a diagram showing a state in which the balloon 4 is used. FIG. 8 is an enlarged view of the portion surrounded by the alternate long and short dash line VIII of FIG. 5, but the catheter body 2 is hidden. FIG. 9 is an enlarged view of the portion surrounded by the alternate long and short dash line IX in FIG.

First, as shown in FIGS. 3 to 5, the urethral catheter 1 includes a catheter main body 2, an operation unit 3, and a balloon 4.

The catheter body 2 is made of a flexible tube, and a hard tip portion 5 is attached to the tip thereof. For example, the catheter body 2 is inserted into the cap-shaped tip portion 5 to form an inro structure, and the mating surfaces of the inro structure are fixed to each other by welding, adhering, or the like.

Even if the catheter body 2 and the tip portion 5 are made of, for example, a rubber latex base material such as natural rubber latex or synthetic rubber latex, a base member such as a silicone base material or a thermoplastic elastomer, which has been surface-treated. Good. Examples of the surface treatment include a hydrophilic coating that imparts lubricity to the base member, a urethane coating / fluorine coating that imparts smoothness to the base member, and a silver coating that imparts antibacterial properties to the base member. Two or more of these surface treatments may be used in combination.

As shown in FIGS. 6 and 7, the catheter body 2 is formed so that the urine draining lumen 11, the liquid introducing lumen 12, and the deforming lumen 13 extend along the longitudinal direction of the catheter body 2. Has been done.

The urine draining lumen 11 is a passage for guiding the urine 10 in the patient's bladder 7 to the outside of the body, and is a tip end portion from a base portion 14 (see FIG. 5) which is one end portion in the longitudinal direction of the catheter body 2. It penetrates to the portion 15 and is formed substantially in the center of the catheter body 2. The urine discharge lumen 11 communicates with a first urine discharge port 9 formed in the tubular tip portion 5, and urine passes through the first urine discharge port 9 to the urine discharge lumen 11. It will get in. The first urine discharge port 9 is formed in a slightly vertically elongated elliptical shape in the longitudinal direction of the catheter body 2 (see FIG. 9), and is provided in pairs so as to face each other in the radial direction of the catheter body 2, for example. It may be (see FIGS. 6 and 7).

Further, as shown in FIG. 3, the catheter main body 2 has a second urine discharge lumen 11 communicating with the urine discharge lumen 11 on the opposite side of the first urine discharge port 9 with the balloon 4 sandwiched in the longitudinal direction of the catheter main body 2. The urine outlet 37 is formed. More specifically, the second urine discharge port 37 is formed so as to penetrate the first end portion 25 of the balloon 4, which will be described later.

Like the first urine discharge port 9, the second urine discharge port 37 is formed in a slightly vertically elongated elliptical shape in the longitudinal direction of the catheter body 2, for example, so as to face the catheter body 2 in the radial direction. May be provided in pairs. Further, as shown in FIG. 10, the second urine discharge port 37 is located at a position where the liquid introduction lumen 12 and the deformation lumen 13 are avoided in the radial cross-sectional view of the catheter main body 2, and in this embodiment, the first The urine discharge port 9 is arranged at a position rotated by 90 °. As a result, the second urine discharge port 37 is prevented from interfering with the liquid introduction lumen 12 and the deformation lumen 13.

The liquid introduction lumen 12 is a passage for introducing the liquid for expansion into the balloon 4, and is formed so as to extend along the urine discharge lumen 11. The liquid introduction lumen 12 is formed from the base portion 14 of the catheter main body 2 to the middle portion in the longitudinal direction of the catheter main body 2 with the base portion 14 of the catheter main body 2 as an open end, and the terminal portion thereof is a dead end portion 16. The dead end portion 16 is arranged between the first urine discharge port 9 and the balloon distribution port 17 (described later). Further, a balloon flow port 17 communicating with the liquid introduction lumen 12 is formed on the peripheral surface 31 of the catheter main body 2.

The deforming lumen 13 is a passage for deforming the catheter body 2 to facilitate insertion and removal of the urethral catheter 1, and is formed so as to extend along the urine draining lumen 11. The deformation lumen 13 is formed from the base portion 14 of the catheter main body 2 to the middle portion in the longitudinal direction of the catheter main body 2 with the base portion 14 of the catheter main body 2 as an open end, and the terminal portion thereof is a dead end portion 18. The dead end portion 18 is arranged between the first urine discharge port 9 and the balloon flow port 17 at the same length as the dead end portion 16 of the liquid introduction lumen 12 in the longitudinal direction of the catheter main body 2. ing. Further, unlike the liquid introduction lumen 12, the deformation lumen 13 does not circulate with the outside through an opening such as a balloon flow port 17, but circulates with the outside only at the open end thereof.

The operation unit 3 is a part handled by a caregiver such as a doctor or a nurse, and integrally includes a urine discharge port 19, a liquid introduction port 20, and a deformation port 21. In the operation unit 3, as shown in FIGS. 3 to 5, the liquid introduction port 20 and the deformation port 21 are symmetrical with each other from the peripheral surface of the funnel-shaped urine discharge port 19 extending on the extension line of the catheter body 2. It may be formed in a three-pronged shape that branches into. The operation unit 3 may be fixed to the catheter body 2 by, for example, being made of the same material as the catheter body 2 and being insert-molded to the catheter body 2. The operation unit 3 may be made of a material different from that of the catheter body 2, and in that case, it may be fixed to the catheter body 2 by insert molding, welding, adhesion, or the like.

Further, as shown in FIG. 5, the urine discharge port 19, the liquid introduction port 20, and the deformation port 21 have the urine discharge passage 22, the liquid introduction passage 23, and the deformation passage 24 independent of each other, respectively. Is formed. The urine discharge passage 22 communicates with the urine discharge lumen 11, the liquid introduction passage 23 communicates with the liquid introduction lumen 12, and the deformation passage 24 communicates with the deformation lumen 13.

A container such as a urine storage bag for collecting the discharged urine is connected to the urine discharge port 19. Further, at the tips of the liquid introduction port 20 and the deformation port 21, for example, valves 39 and 40 for connecting a syringe are provided. A caregiver such as a doctor or a nurse connects a syringe filled with a liquid for balloon expansion to the valve 39 and pushes the plunger of the syringe to pass through the liquid introduction passage 23 and the liquid introduction lumen 12. A liquid can be injected into the balloon 4. In addition, a caregiver such as a doctor or a nurse connects an empty syringe to the valve 40 and pulls the plunger of the syringe to accommodate the air in the deformation passage 24 and the deformation lumen 13 in the syringe. Negative pressure can be applied to the inside of the deformation lumen 13.

The balloon 4 has a first end 25 fixed so as to surround the catheter body 2 and a second end 26 on the tip 15 side of the first end 25, and the first end 25 and the second end 25. It has an inflated portion 27, which is provided between the portions 26 and is composed of a membrane that expands spherically in the patient's bladder 7. The balloon 4 is connected to the balloon distribution port 17 inside the expansion portion 27. Further, the first end portion 25 and the second end portion 26 of the balloon 4 may be fixed to the catheter body 2 by, for example, welding or adhesion. Examples of the material of the balloon 4 include rubber latex, silicone, and thermoplastic elastomer.

Further, as shown in FIG. 8, a plurality of ribs 28 may be provided on the inner surface of the expansion portion 27 along the circumferential direction of the catheter body 2. Each of the plurality of ribs 28 is formed in an annular shape so as to surround the catheter body 2, and is arranged at intervals along the longitudinal direction of the catheter body 2.

Then, a caregiver such as a doctor or a nurse injects an expansion liquid such as sterilized distilled water into the liquid introduction passage 23 with a syringe, so that the expansion liquid becomes the liquid introduction lumen 12 and the balloon flow port 17. It enters the balloon 4 through the balloon 4, and as shown in FIG. 7, the balloon 4 expands in a spherical shape.

Next, the configuration of the catheter body 2 will be described in more detail.

FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 3, showing an uncompressed shape of the catheter body 2. FIG. 12 is a cross-sectional view taken along the line of XI-XI in FIG. 3, showing a state in which the shape of the catheter body 2 is compressed. FIG. 13 is a diagram showing a modified example of the catheter main body 2, and shows a state in which the shape of the catheter main body 2 is uncompressed. FIG. 14 is a diagram showing a modified example of the catheter main body 2, showing a state in which the shape of the catheter main body 2 is compressed.

First, referring to FIGS. 11 and 12, as described above, the catheter body 2 may be entirely composed of a flexible soft member such as a rubber latex base material or a silicone base material. For example, it may have a two-layer structure consisting of an outer layer 29 that contacts the inner wall (mucosal portion) of the urethra 8 and an inner layer 30 that is formed inside the outer layer 29 and forms the inner wall of the lumen 11 for urine discharge. The inner layer 30 is preferably made of a member harder than the outer layer 29.

That is, it is preferable that the catheter body 2 has a structure in which a tubular core material composed of an inner layer 30 having a relatively rigid (stiffness) is coated with an outer layer 29 which is softer and more easily deformed than the core material. As a result, for a caregiver such as a doctor or a nurse who inserts the urethral catheter 1, the rigidity of the inner layer 30 makes it easy to insert the urethral catheter 1 even if there is some resistance during insertion, and the urethral catheter 1 is inserted. For the patient on the side of the urethra, the portion in contact with the inner wall of the urethra 8 is soft, which has the advantage of reducing pain.

The outer layer 29 may be made of, for example, a rubber latex base material such as the above-mentioned natural rubber latex or synthetic rubber latex, or a base member such as a silicone base material that has been surface-treated. On the other hand, the inner layer 30 may be made of, for example, hard silicone, thermoplastic elastomer, or the like. Further, the inner layer 30 may be subjected to the above-mentioned surface treatment as in the outer layer 29.

Further, the catheter body 2 has a constant outer diameter from the base portion 14 to the tip portion 15 (see FIG. 5), and has, for example, an outer diameter of 2 mm to 10 mm.

Next, the positions and shapes of the urine discharge lumen 11, the liquid introduction lumen 12, and the deformation lumen 13 of the catheter body 2 will be described.

The urine discharge lumen 11 is formed in a circular shape at the center thereof in a radial cross-sectional view of the catheter body 2. The inner diameter of the urine discharge lumen 11 may be, for example, about 2 mm to 5 mm.

The liquid introduction lumen 12 is formed in a circular shape having a diameter smaller than that of the urine discharge lumen 11 around the urine discharge lumen 11. The inner diameter of the liquid introduction lumen 12 may be, for example, about 0.1 mm to 0.8 mm.

The deformation lumen 13 is arranged around the urine discharge lumen 11 so as to face the liquid introduction lumen 12 with the urine discharge lumen 11 interposed therebetween. In this embodiment, the deforming lumen 13 is formed in a flat shape curved along the peripheral surface 31 of the catheter body 2. More specifically, the deforming lumen 13 has a radial line segment R ₁ of a fan-shaped region 32 having a central angle θ of 90 ° or less extending from the center C of the urine draining lumen 11 in a radial cross-sectional view of the catheter body 2. on R _2, it is formed in a flat shape having one end portion 33 and the other end portion 34.

Since such a deformation lumen 13 is formed, a caregiver such as a doctor or a nurse draws air in the deformation lumen 13 with a syringe to create a negative pressure, thereby creating a negative pressure on the outer surface of the deformation lumen 13. The 35 and the inner side surface 36 can be brought into close contact with each other. As a result, a part of the catheter body 2 can be compressed, so that the outer diameter of the catheter body 2 can be reduced. As a result, the pain felt by the patient when the urethral catheter 1 is inserted can be reduced.

When the catheter body 2 has a two-layer structure in the inner layer 30 and the outer layer 29, the deformation lumen 13 is preferably formed in a relatively soft outer layer 29. As a result, the catheter body 2 can be easily compressed.

Further, as shown in FIGS. 11 and 12, only one deformation lumen 13 may be formed on the catheter main body 2, but a plurality of deformation lumens 13 may be formed as shown in FIGS. 13 and 14. .. In this case, one of the deformation lumens 13 (second deformation lumen) may have the tip end side blocked by the dead end portion 18 as described above, and the other deformation lumen 13 (first deformation lumen) The lumen) is formed so as to communicate with the balloon 4 via the balloon flow port 17, and may also serve as the liquid introduction lumen 12. Even when the lumen 12 for introducing a liquid is also used, since the balloon 4 is closed, the lumen 12 can be negatively pressured because it circulates with the outside only at the open end of the lumen 12 for introducing a liquid. .. The plurality of deformation lumens 13 may be arranged so as to face each other with the urine discharge lumen 11 interposed therebetween. If a plurality of deformation lumens 13 are formed, the catheter body 2 can be compressed to a smaller diameter.

Further, the deformation lumen 13 may have the configuration shown in FIGS. 15 and 16. Specifically, in the radial cross-sectional view of the catheter body 2, the length L ₂ of the inner surface 36 of the deformation lumen 13 may be longer than the length L ₁ of the outer surface 35 (L ₂ > L _1). ).

In this modification, in the radial cross-sectional view of the catheter body 2, the direction orthogonal to the first direction D ₁ and the first direction D ₁ passing through the center C of the urine discharge lumen 11 is defined as the second direction D ₂ .

Outer surface 35 of the deformable lumen 13, equally on both sides of the first direction D _1, are formed in an arc shape along the circumferential surface 31 of the circular of the catheter body 2. Length L- ₁ of the outer surface 35 of the deformation lumen 13 having such a shape (In the upper deformation lumen 13 of FIG. 15, an upper line segment connecting one end 33 and the other end 34 of the deformation lumen 13 The length) may be, for example, 2 mm to 4 mm.

On the other hand, the inner side surface 36 of the deformation lumen 13 partitions the flat-shaped deformation lumen 13 along the peripheral surface 31 of the catheter body 2 in cooperation with the outer surface 35, but the shape is similar to that of the outer surface 35. It is different from the arc shape that follows the peripheral surface 31 at a constant distance. Specifically, the inner surface 36 of the deforming lumen 13 is recessed so that a part thereof is separated from the peripheral surface 31 toward the inner region of the catheter 2. In this modification, the inner surface 36 of the deformation lumen 13 is located along the outer surface 35 from each of the one end 33 and the other end 34 of the deformation lumen 13 (keeping a constant distance from the peripheral surface 31). a pair of arcuate projection 46 toward the one direction D _1, (in this modification, the direction of the center C) inner region of the catheter 2 in the vicinity of the first direction D ₁ recess away from the peripheral surface 31 toward the It is formed in a wavy shape having an integral recess 45. As a result, the length L- ₂ of the wavy inner surface 36 is longer than the length L- ₁ of the arc-shaped outer surface 35. The length L- ₂ of the wavy inner surface 36 (the length of the lower line segment connecting one end 33 and the other end 34 of the deformation lumen 13 in the upper deformation lumen 13 in FIG. 15) is, for example. , 2.5 mm to 4.5 mm.

As a result, the distance (thickness T ₁ ) between the recess 45 on the inner surface 36 of the deformation lumen 13 and the inner peripheral surface 47 of the lumen for urine discharge may be, for example, 0.4 mm to 0.6 mm. The distance (thickness T ₂ ) between the convex portion 46 of the inner surface 36 of the deformation lumen 13 and the inner peripheral surface 47 of the lumen for urine discharge may be, for example, 0.7 mm to 0.9 mm.

Further, as shown in FIG. 15, the urine discharge lumen 11 is formed in an elliptical shape with the direction along the longitudinal direction of the deformation lumen 13 as the major axis direction in the radial cross-sectional view of the catheter main body 2. More specifically, it may have an elliptical shape with the direction along the second direction D ₂ as the long axis direction. In this modification, the urine discharge lumen 11 has an elliptical shape having long-axis ends 48 and 49 on the sides away from the outside (center C) of the deformation lumen 13 at one end 33 and the other end 34, respectively. It is formed.

In the catheter body 2 according to this modification, the length L ₂ of the inner surface 36 of the deformation lumen 13 is longer than the length L ₁ of the outer surface 35. Therefore, as shown in FIG. 16, when the air in the deformation lumen 13 is pulled to create a negative pressure, the peripheral surface 31 of the catheter body 2 bends in the a ₁ direction, the a ₂ direction, the b ₁ direction, and the b ₂ direction. It is compressed so that it can be used. As a result, it is possible to prevent the occurrence of so-called excess meat, in which a part of the peripheral surface 31 of the catheter body 2 is angular.

Further, since the inner side surface 36 of the deformation lumen 13 is wavy and the urine discharge lumen 11 is elliptical, the outer surface 35 approaching the inner surface 36 by compression is selected as the pair of convex portions 46 of the inner surface 36. Can be brought into contact with each other (non-contact with the recess 45). Thus, opposite to the recess 45 of the inner surface 36 (located on a first direction D _1), selectively applying a load to the end portion 50 and 51 of the minor axis of the inner circumferential surface 47 of the urinary drainage lumen 11 Can be done. As a result, for example, the lumen 11 for urine discharge is deformed in the c ₁ direction, c ₂ direction, d ₁ direction and d ₂ direction in a pantograph shape, and the ends 50 and 51 are projected into the urine discharge lumen 11. Therefore, further cross-sectional compression of the catheter body 2 becomes possible. For example, when the diameter of the catheter body 2 before compression is D _c1 , the diameter D _c 2 of the catheter body 2 after compression can be set to about 70 to 80%.

In the catheter body 2 according to this modification, as in FIGS. 11 and 12, only one deformation lumen 13 may be formed.

Further, as shown in FIG. 17, the deforming lumen 13 has a flat shape along the peripheral surface 31 of the catheter main body 2, but may not be curved along the peripheral surface 31.

Next, the configuration of the balloon 4 will be described in more detail.

18 and 19 are perspective views for explaining the characteristics of the shape of the balloon 4 of the urethral catheter 1, and show a state in which the balloon 4 is inflated. FIG. 18 is a view of the balloon 4 viewed from the tip 15 side of the catheter body 2, and FIG. 19 is a view of the balloon 4 viewed from the opposite side of the tip 15 of the catheter body 2. FIG. 20 is a cross-sectional view for explaining the characteristics of the shape of the balloon of the urethral catheter 1. FIG. 21 is a diagram for explaining the effect of the urethral catheter 1.

In this embodiment, the balloon 4 has a linear recess 38 (concave) extending from the first end 25 toward the second end 26 along its peripheral surface, as shown in FIGS. 18 and 19. Have. The recess 38 is formed so that the first end portion 25 is the starting end and the second end portion 26 is the ending end. As a result, for example, as shown in FIG. 21, in a state where the inflated portion 27 of the inflated balloon 4 is in contact with the inner wall of the bladder 7 (for example, the bladder neck), between the inflated portion 27 and the inner wall of the bladder 7. In addition, a certain space 41 is formed. The second urine discharge port 37 is formed at a predetermined position of the first end portion 25 of the balloon 4 so as to be exposed in this space 41.

As shown in FIG. 20, the recesses 38 are formed at equal intervals in the annular direction along the peripheral surface 31 of the catheter body 2. For example, in this embodiment, in the radial cross-sectional view of the catheter body 2, a total of three catheters are formed around the center C (the center of the urine discharge lumen 11) with an interval of 120 °. The number of recesses 38 is not limited to three, and may be four or more.

Further, as shown in FIG. 20, the inner wall of the inflated balloon 4 has a portion where the recess 38 is formed so as to project inward with respect to the other plane region 42 in the radial cross-sectional view of the catheter body 2. It is formed as a convex portion 43. On the other hand, "balloon 4'" in FIG. 20 shows a state in which the balloon 4 is not inflated. In this state, a convex portion 44 is formed at a position corresponding to the concave portion 38 on the outer peripheral surface of the balloon 4'. There is. In the balloon 4, the film thickness T ₁ (height of the convex portions 43 and 44) of the portion where the concave portion 38 is formed is formed to be thicker than the film thickness T _{2 of the} other portion (plane region 42). For example, the film thickness T ₁ is 0.3 mm to 1.5 mm, and the film thickness T ₂ is 0.05 mm to 0.7 mm. That is, since the convex portion 44 is formed when the balloon 4 is not inflated, when the balloon 4 is inflated, a difference in the degree of expansion occurs between the convex portion 44 and the other portion, and the convex portion 44 is expanded after the expansion. A recess 38 is formed at the forming site.

As described above, with reference to FIG. 21, in a state where the inflated portion 27 of the inflated balloon 4 is in contact with the inner wall of the bladder 7 (for example, the bladder neck), between the inflated portion 27 and the inner wall of the bladder 7. In addition, a constant space 41 is formed. A plurality of recesses 38 are formed in the balloon 4 so as to enter the space 41.

Liquid level of the urine 10 in the bladder 7 is, as the liquid surface S ₁ in FIG. 21, if a position higher than the first urine output port 9, the urine 10 via the first urine output port 9 Can be discharged. On the other hand, as the liquid surface S ₂ in FIG. 21, if a position lower than the liquid level first urine outlet 9 of urine 10, it is discharged through the first urine output port 9 is difficult is there. Even in such a case, if the urethral catheter 1 is used, the urine 10 existing at a position lower than the first urine discharge port 9 is flowed downward along the recess 38 to guide the space 41 to the space 41. It can be discharged from the second urine discharge port 37 exposed to. As a result, the urine 10 from the inner wall of the bladder 7 to the top of the balloon 4 can be easily discharged while having the function of preventing the balloon from falling off. The embodiment of the present invention has been described above. Can also be implemented in other forms.

For example, in the above-described embodiment, only the urethral catheter 1 provided with the balloon 4 is taken as an example, but from the viewpoint of "reducing the pain felt by the patient during insertion and removal" of the present invention, the balloon 4 is provided. It does not have to be.

In addition, various design changes can be made within the scope of the matters described in the claims.

This application corresponds to Japanese Patent Application No. 2017-172173 filed with the Japan Patent Office on September 7, 2017, and the full disclosure of this application shall be incorporated herein by reference.

1 Urine catheter 2 Catheter body 3 Operation part 4 Balloon 5 Tip part 6 Human body 7 Bladder 8 Urine tract 9 First urine outlet 10 Urine 11 Urine discharge lumen 12 Liquid introduction lumen 13 Deformation lumen 14 (Catheter body) base 15 (Catheter body) Tip 16 Dead end 17 Balloon flow port 18 Dead end 19 Urine discharge port 20 Liquid introduction port 21 Deformation port 22 Urine discharge passage 23 Liquid introduction passage 24 Deformation passage 25 (Balloon) 1st End 26 (Balloon) Second end 27 (Balloon) Inflatable part 28 Rib 29 Outer layer 30 Inner layer 31 Peripheral surface 32 Fan-shaped area 33 (Deformation lumen) One end 34 (Deformation lumen) The other end 35 (Deformation lumen) ) Outer surface 36 (Lumen for deformation) Inner surface 37 Second urine outlet 38 Concave 39 Valve 40 Valve 41 Space 42 Flat area 43 Convex 44 Convex 45 Concave 46 Convex 47 Inner peripheral surface 48 End 49 End 50 end 51 end

Claims (12)

A catheter body consisting of a flexible tube with a tip and contralateral base that is placed in the patient's bladder.
A lumen for urine drainage, which is formed in the catheter body and guides urine in the patient's bladder to the outside of the body,
A urinary catheter comprising a flat-shaped deforming lumen along the peripheral surface of the catheter body in a radial cross-sectional view of the catheter body, which is formed in the catheter body so as to extend along the urine draining lumen. The urethral catheter according to claim 1, wherein the deforming lumen is formed in a flat shape curved along the peripheral surface of the catheter body in a radial cross-sectional view of the catheter body. The deformation lumen has an outer surface close to the peripheral surface of the catheter body and an inner surface facing the outer surface.
The urethral catheter according to claim 2, wherein the length L ₂ of the inner surface of the deforming lumen is longer than the length L _{1 of the} outer surface. The urinary tract catheter according to claim 3, wherein the urine draining lumen is formed in an elliptical shape having a longitudinal direction along the longitudinal direction of the deforming lumen in a radial cross-sectional view of the catheter body. The deforming lumen has one end and the other end on a radial line segment of a fan-shaped region having a central angle of 90 ° or less extending from the center of the urine draining lumen in a radial cross-sectional view of the catheter body. The urinary tract catheter according to any one of claims 1 to 4. The urethral catheter according to any one of claims 1 to 5, wherein the catheter body has a constant outer diameter from the base portion to the tip portion. The urethral catheter according to claim 6, wherein the outer diameter of the catheter body is 2 mm to 10 mm. A balloon portion provided on the tip side of the catheter body and inflating in the patient's bladder,
The claim further comprises a liquid introduction lumen formed in the catheter body extending along the urine discharge lumen so as to communicate with the balloon portion and for introducing a liquid for expansion into the balloon portion. The urinary tract catheter according to any one of 1 to 7. The urethral catheter according to claim 8, wherein the deformation lumen is arranged so as to face the liquid introduction lumen with the urine discharge lumen interposed therebetween. A balloon portion provided on the distal end side of the catheter body and inflated in the patient's bladder is further included.
The deformation lumen is formed in the catheter body so as to communicate with the balloon portion along the urine discharge lumen, and a liquid introduction lumen for introducing a liquid for expansion into the balloon portion is provided. The urinary catheter according to any one of claims 1 to 7, which also serves as the catheter. The deformation lumen is different from the first deformation lumen which also serves as the liquid introduction lumen and the first deformation lumen, and the second deformation lumen in which the tip end side of the catheter body is closed. The urinary catheter according to claim 10, wherein the catheter comprises. The urethral catheter according to claim 10 or 11, wherein the first deforming lumen and the second deforming lumen are arranged so as to face each other with the urine draining lumen interposed therebetween.

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