Urethra indwelling device

Abstract

To provide a urethra indwelling device capable of being stably retained in a prescribed position within the urethra by a simple structure.SOLUTION: A urethra indwelling device 1 for being retained within the urethra comprises: a prostate chip 10 that is positioned on a tip side so as to be retained in the prostatic portion urethra B; a bulbar urethra chip 20 that is positioned on the hand side so as to be retained in the bulbar urethra C; and a chip connection wire 31 made of a superelastic alloy, which connects the prostate chip 10 and the bulbar urethra chip 20 together. The chip connection wire 31 is shape-memorized in an approximately arc shape with a central angle of 60-130°.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a urethral indwelling device to be placed in the urethra. [Background technology]

[0002] When urination problems occur due to the urethra becoming closed or narrowed due to an enlarged prostate, a treatment is performed in which a urethral stent (a device that retains urethral fluid) is inserted into the urethra to widen it.

[0003] Such urethral stents are disclosed, for example, in the following Patent Documents 1 to 3. Urethral stents need to be placed in a predetermined position, such as the prostatic urethra, but when the user moves, the urethra also deforms accordingly, and in many cases the urethral stent placed in the urethra shifts from its predetermined position.

[0004] For this reason, in the following Patent Documents 1 to 3, in order to place the urethral stent in a predetermined position, a stopper that engages with a predetermined part in the urethra to prevent it from progressing further, or a balloon that expands inside the urethra, etc. are installed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-52835 [Patent Document 2] Special Publication No. 2008-543499 [Patent Document 3] Patent No. 4025648 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when a stopper is used, it is not possible to prevent the urethral stopper from moving forward, and when a balloon is used, the structure becomes complicated, which places a heavy burden on the user.

[0007] The present invention has been made in view of these problems, and has an object to provide a urethral indwelling device that has a simple structure and can be stably placed at a predetermined position inside the urethra. [Means for solving the problem]

[0008] The urethral retainer of the present invention, which solves the above problems, is a urethral retainer that is retained in the urethra, and comprises a prostate tip located at the tip end and retained in the prostatic urethra, a bulbar urethral tip located at the proximal end and retained in the bulbar urethra, and a tip connecting wire made of a superelastic alloy that connects the prostate tip and the bulbar urethral tip, and the tip connecting wire is characterized in that it has shape memory in a roughly arc shape with a central angle of 60 to 130°. [Effects of the Invention]

[0009] In the urethral retainer according to the present invention, the prostate tip and the bulbar urethral tip are connected by a tip connecting wire made of a superelastic alloy that has been given a shape memory treatment in an approximately arc shape, allowing the urethral retainer to be placed stably in the urethra. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a side view of a urethral indwelling device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the urethral indwelling device according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view of a connecting portion between the prostate chip and the chip connecting wire according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view of the invasion prevention tip according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a partial cross-sectional view showing the urethral indwelling device according to the first embodiment of the present invention in an indwelling state. [Figure 6] FIG. 6 is a side view of a urethral indwelling device according to a second embodiment of the present invention. [Figure 7]FIG. 7 is a front view of a urethral indwelling device according to a second embodiment of the present invention. [Figure 8] FIG. 8 is a partial cross-sectional view showing the placement state of the urethral placement device according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] (First embodiment) A first embodiment of the present invention will now be described with reference to the drawings. This embodiment is characterized in that a wire made of a superelastic alloy is used as a member connecting the chips that make up the urethral indwelling device, allowing the urethral indwelling device to be stably placed within the urethra.

[0012] The urethral indwelling device 1 comprises a prostate tip 10, a bulbar urethral tip 20, a tip connecting linear member 30 that connects the prostate tip 10 and the bulbar urethral tip 20, an intrusion prevention tip 40, and a removal connecting cord 50. In this embodiment, the front side that is inserted into the urethra first when placed in the urethra is referred to as the tip side, and the rear side that is inserted last is referred to as the proximal side.

[0013] The prostate chip 10 is a flat ceramic plate that, when placed inside the urethra, is positioned in the prostatic urethra B and functions to widen the prostatic urethra B to ensure the passage of urine. A connecting hole 10a is formed at the proximal end of the prostate chip 10 for connecting to a tip connecting linear member 30 (see Figure 3).

[0014] The prostate chip 10 is provided with a connecting portion cover 11 made of epoxy resin for fixing and covering the connecting portion when the tip of the tip connecting linear member 30 is inserted into the connecting hole 10a. In Figure 3, the connecting portion cover 11 is depicted by a two-dot chain line.

[0015] The bulbar urethral tip 20 is a roughly ellipsoidal tip made of epoxy resin, and when placed in the urethra, it is positioned in the bulbar urethra C. A tip connecting linear member 30 and a removal connecting cord 50 pass through the center of the bulbar urethral tip 20 from the tip side to the handle side.

[0016] The tip connecting linear member 30 includes a tip connecting wire 31 made of a superelastic alloy, a type of shape-memory alloy, and a resin cover tube 35 that covers the tip connecting wire 31. Specifically, the tip connecting wire 31 is made of a nickel-titanium (Ni-Ti) alloy and has its shape memorized in advance into a substantially arc-shaped configuration with a central angle of approximately 100° (see FIG. 1, etc.). The tip connecting wire 31 is elastically deformable, but exhibits superelasticity, returning to its original substantially arc-shaped configuration at normal room temperature or body temperature above 0°C. In this embodiment, the substantially arc-shaped configuration includes shapes that are close to an arc, such as an ellipse or C-shape.

[0017] When the tip connecting wire 31 is in its original, approximately arc shape, the extension directions (insertion directions) of both ends of the tip connecting linear member 30 are approximately perpendicular to each other, and the prostate chip 10 and the bulbar urethral chip 20 located at each end are positioned relative to each other so that their respective longitudinal directions (insertion directions) are approximately perpendicular to each other.

[0018] The cover tube 35 is a translucent flexible vinyl tube that entirely covers the tip connecting wire 31. In this embodiment, the tip connecting wire 31 has an outer diameter of 0.6 mm, and the cover tube 35 has an inner diameter of 1.5 mm, an outer diameter of 2.5 mm, and a thickness of 0.5 mm.

[0019] The tip of the tip connecting linear member 30 that connects to the prostate tip 10 is bent by approximately 90° due to plastic deformation and hooked onto the connecting hole 10a (see FIG. 3). At this time, the flattened prostate tip 10 is connected and fixed to the tip connecting linear member 30 in an orientation that is perpendicular to a plane that includes the tip connecting wire 31, which has a substantially arc-like shape with a central angle of approximately 100°. The connection structure between the bulbar urethral tip 20 and the tip connecting linear member 30 will be described later.

[0020] The penetration prevention chip 40 is a generally circular flat plate made of epoxy resin (see FIG. 4), and is installed near the prostate chip 10. Figure 4(a) is a perspective view of the penetration prevention chip 40 as seen from one surface side, and Figure 4(b) is a perspective view as seen from the other surface side.

[0021] A wire insertion hole 41 through which the tip connecting linear member 30 passes is formed in the center of the penetration prevention tip 40, and multiple communication holes 45 are formed around the wire insertion hole 41. When the penetration prevention tip 40 is placed in the urethra, urine can pass through these communication holes 45 during urination.

[0022] As shown in Fig. 4, the wire insertion hole 41 is formed in a shape that allows the inclination angle of the tip connecting linear member 30 relative to the surface of the penetration-preventing tip 40 to be freely changed from a vertical state to a state inclined by 20°. Fig. 1 shows a state in which the penetration-preventing tip 40 is inclined by 20° from a state in which it is parallel to the tip connecting linear member 30, and Fig. 2 shows a state in which the penetration-preventing tip 40 is perpendicular to the tip connecting linear member 30. By placing the penetration-preventing tip 40 in this lying state, it can be smoothly inserted deep into the urethra.

[0023] In this embodiment, the diameter of the wire insertion hole 41 is 2 mm, which is smaller than the outer diameter of 2.5 mm of the cover tube 35. However, the outer diameter of the tip coupling wire 31 is 0.6 mm, the thickness of the cover tube 35 is 0.5 mm, and the sum of the outer diameter of the tip coupling wire 31 and twice the thickness of the cover tube 35 (1.6 mm) is smaller than the diameter of the wire insertion hole 41. Therefore, the tip connecting linear member 30 can pass through the wire insertion hole 41 while the flexible resin cover tube 35 is deforming.

[0024] At this time, the penetration prevention tip 40 is fixed to a predetermined location on the tip connecting linear member 30 by the frictional force with the deformed cover tube 35, but by applying a force greater than this frictional force to the penetration prevention tip, it is possible to slide the penetration prevention tip 40 to any position relative to the tip connecting linear member 30. By adjusting the position of the penetration prevention tip 40 by sliding it, the placement position of the prostate tip can be adjusted.

[0025] When the urethral retention device 1 is placed in the urethra, the entry-prevention tip 40, which enters the urethra following the prostate tip 10, approaches the external urethral sphincter K, which is narrow in the urethra, from the bulbous urethra C, which has a relatively large space, and the edge of the entry-prevention tip 40 that collides with the external urethral sphincter K cannot proceed any further, and as the part of the wire insertion hole 41 connected to the tip connecting linear member 30 approaches the external urethral sphincter K, the entry-prevention tip 40 gradually changes its position to stand perpendicular to the tip connecting linear member 30.

[0026] When the wire insertion hole 41 of the penetration prevention chip 40 reaches the external urethral sphincter K, the penetration prevention chip 40 stands upright and collides with the external urethral sphincter K, preventing it from advancing any further into the urethra. At this time, if the installation position of the penetration prevention chip 40 is adjusted so that the prostate chip 10 is positioned exactly in the prostatic urethra B, it is possible to reliably prevent the prostate chip 10 from advancing too far deeper than the prostatic urethra B.

[0027] The retrieval string 50 is a resin thread, one end of which is connected to the bulbar urethral tip 20. Therefore, when the urethral indwelling device 1 is retained in the urethra, if the rear end of the retrieval string 50, which is located at the rearmost end of the urethral indwelling device 1, is left outside the urethra (see Figure 5), then when removing the urethral indwelling device 1, the bulbar urethral tip 20, the entry prevention tip 40, and the prostate tip 10 can be sequentially removed from the urethra by pulling the retrieval string 50.

[0028] Here, we will explain the connection structure of the bulbar urethral tip 20, tip connecting linear member 30, and retrieval connecting cord 50. First, the tip of the retrieval connecting cord 50 is tied to the rear end of the tip connecting linear member 30 to connect the two. In this state, epoxy resin is hardened to cover this connected portion to form the tip, and the bulbar urethral tip 20 is firmly connected and fixed to the rear end of the tip connecting linear member 30 and the tip of the retrieval connecting cord 50.

[0029] With this configuration, when the urethral indwelling device is removed by pulling the retrieval connecting cord 50, the retrieval connecting cord 50 will not come off the bulbar urethral tip 20, and the two can be firmly connected together.

[0030] Although epoxy resin is hard and strong, it lacks elasticity. Therefore, by first covering the connection between the tip connecting linear member 30 and the retrieval connecting cord 50 with silicone resin and then covering the silicone resin with epoxy resin, the bulbous urethral tip 20, tip connecting linear member 30, and retrieval connecting cord 50 can be firmly and favorably connected.

[0031] Having explained above the configuration of the urethral indwelling device 1, we will now explain how to use the urethral indwelling device 1. When placing the urethral indwelling device 1 in the urethra, that is, when placing the prostate-chip 10 in the prostatic urethra B, the user first grasps the prostate-chip 10 and inserts its tip into the external urethral meatus E, which is the entrance to the urethra, and then gradually pushes the entire prostate-chip 10 into the urethra.

[0032] After the entire prostate chip 10 has entered the urethra, the user can push the prostate chip 10 further into the urethra by pinching and pushing the bulbous urethral chip 20 connected to the prostate chip 10 by the tip connecting linear member 30.

[0033] Thereafter, when the entry-prevention tip 40 reaches the entrance of the external urethral meatus E, the entry-prevention tip 40 is tilted at 20° relative to the tip connecting linear member 30 and pushed further into the urethra. Next, when the tip side of the bulbar urethral tip 20 reaches the entrance of the external urethral meatus E, the bulbar urethral tip 20 is continued to be pushed into the urethra. After the entire bulbar urethral tip 20 has entered the urethra, the prostate tip 10, entry-prevention tip 40, bulbar urethral tip 20, and tip connecting linear member 30 can be pushed further in by milking or the like.

[0034] Here, the urethra has a fairly long pendular urethra D, which then curves upward by approximately 90° from horizontal as it progresses deeper into the bulbar urethra C and prostatic urethra B (see Figure 1). Therefore, if tip connecting linear member 30 remained in a roughly arc shape, it would be difficult to smoothly advance urethral retainer 1 deeper; however, tip connecting linear member 30, which is made of a superelastic alloy, elastically deforms appropriately to fit the shape of the urethra, allowing urethral retainer 1 to be smoothly inserted deeper into the urethra.

[0035] When the tip of the Prostate Chip 10 passes through the pendular urethra D and the bulbar urethra C and reaches the external urethral sphincter K, it must be pushed in carefully because the urethra is narrow at the external urethral sphincter K. After the tip of the Prostate Chip 10 passes through the external urethral sphincter K, if the Prostate Chip 10 is pushed in further, the rear end of the Prostate Chip 10 will pass through the external urethral sphincter K, and the entire Prostate Chip 10 will be placed in the desired placement position within the prostatic urethra B (placed state; see Figure 5).

[0036] When the prostate-chip 10 is placed at the desired position in the prostatic urethra B, as described above, the penetration-preventing chip 40 reaches exactly the entrance of the external urethral sphincter K. At this time, the penetration-preventing chip 40 comes into contact with the external urethral sphincter K and stands upright, preventing it from penetrating any further. This reliably prevents the prostate-chip 10 from penetrating further into the bladder A than the prostatic urethra B.

[0037] When the flattened prostate chip 10 is placed in the prostatic urethra B in this way, it widens the prostatic urethra B, ensuring the passage of urine. Furthermore, the intrusion prevention chip 40 is in contact with the entrance of the external urethral sphincter K when standing upright, and multiple communication holes 45 are formed in the intrusion prevention chip 40, allowing urine to pass through these communication holes 45 and be excreted.

[0038] When the flat-shaped intrusion prevention tip 40 is in a vertical position, the urethra is widened by the outer diameter of the intrusion prevention tip 40, but since the bulbar urethral portion C in front of the external urethral sphincter K is a relatively wide part of the urethra, this does not impose an excessive physical burden on the user.

[0039] In this embodiment, the prostate tip 10 and the bulbar urethral tip 20 are connected by a tip connecting linear member 30 that is substantially arc-shaped with a central angle of approximately 100°. Therefore, when the urethral retention device 1 is inserted into the urethra, the tip connecting linear member 30 elastically deforms appropriately to fit the shape of the urethra, allowing for smooth insertion without placing strain on the urethral mucosa.

[0040] As described above, the urethra where urethral retainer 1 is to be placed bends by approximately 90° from horizontal to upward as it progresses through pendular urethra D, bulbar urethra C, and prostatic urethra B. However, in this embodiment, tip connecting wire 31 is used, which has a shape memory that is roughly an arc with a central angle of approximately 100°, which matches the shape of the urethra at this placement position. Therefore, once urethral retainer 1 is placed, elastic deformation of tip connecting wire 31 is kept to a minimum.

[0041] As a result, the components of the urethral retainer 1 in the retained state do not place a large burden on the inner wall of the urethra, the sphincter, etc., and the retained state can be stably maintained. In addition, if the urethral retainer 1 attempts to move from its retained position, the tip connecting wire 31 will resist this by elastically deforming, preventing the urethral retainer 1 from shifting from its retained position within the urethra.

[0042] Furthermore, the direction in which the elastic force of the tip connecting linear member 30 in the retained state acts is mainly in the direction of increasing or decreasing the central angle of the arc shape. However, since the prostate chip 10 is connected in a position perpendicular to the plane including the arc-shaped tip connecting wire 31, in the direction in which the elastic force of the tip connecting linear member 30 acts, the prostate chip 10 comes into contact with the inner wall of the urethra with its surface, which distributes the contact pressure and minimizes the burden on the wearer.

[0043] When the urethral indwelling device 1 is inserted into the urethra to the retention position, it naturally assumes a posture in which the inside of the arc-shaped tip connecting linear member 30 faces upward and in front of the user, as shown in Figure 5. This is because when the arc-shaped tip connecting linear member 30 is deformed appropriately during insertion, an elastic force that tries to return it to its original arc shape is always at work.

[0044] Furthermore, in this embodiment, a tip connecting linear member 30 made of a metal with a certain degree of rigidity is used, so when inserting the urethral retention device 1 into the urethra, even after the prostate tip 10 has entered the urethra, the tip connecting linear member 30 connected to the tip side can be easily inserted further inside by pinching and pushing the bulbous urethral tip 20, making the retention procedure easy.

[0045] Furthermore, even after the bulbar urethral tip 20 is inserted into the urethra, the bulbar urethral tip 20 remains positioned within the bulbar urethra C, allowing the user to check the position of the bulbar urethral tip 20 with their fingers from the outside. This allows the user to grasp the position of the prostate tip 10 located deep inside, which is connected to the bulbar urethral tip 20 by the tip connecting linear member 30. Furthermore, the user can fine-tune the position of the prostate tip 10 by adjusting the position of the bulbar urethral tip 20 located in the pendulum urethra D by milking or the like.

[0046] The bulbar urethral tip 20 may also be shaped like a flat plate. A flat plate shape allows for good urine flow through the bulbar urethra, and if the bulbar urethral tip 20 and the tip connecting wire 30 are connected and fixed in place so as to be perpendicular to a plane including the generally arc-shaped tip connecting wire 30, the bulbar urethral tip 20 will also come into contact with the inner wall of the urethra in the direction in which the elastic force of the tip connecting wire 30 acts, reducing the burden on the wearer and increasing the contact area, stabilizing the placement state.

[0047] Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. The second embodiment differs from the first embodiment in that a bladder chip 45 is provided further distally of the prostate chip 10 and that the structure of the prostate chip 60 is different. Therefore, these differences will be mainly described.

[0048] The urethral indwelling device 2 according to the second embodiment comprises a prostate tip 60, a bulbar urethral tip 20, a tip connecting linear member 30, an entry prevention tip 40, a bladder tip 45, and a retrieval connecting cord 50.

[0049] In the second embodiment, the tip connecting linear member 30 connects and fixes the most distal bladder tip 45, the prostate tip 60, and the bulbar urethral tip 20. When the urethral indwelling device 2 is placed in the urethra, the bladder tip 45 is the tip that advances deeper into the bladder A than the prostatic urethra B. Therefore, the tip connecting linear member 30 according to the second embodiment is longer than that according to the first embodiment.

[0050] The bladder chip 45 is a flat ceramic plate, and like the prostate chip 10 of the first embodiment, a connecting hole (not shown) is formed at the proximal end of the bladder chip 45 for connecting to the chip connecting linear member 30.

[0051] The bladder tip 45 is provided with a connecting portion cover 46 made of epoxy resin for fixing and covering the connecting portion when the tip of the tip connecting linear member 30 is inserted into the connecting hole.

[0052] The prostate tip 60 comprises two screw-shaped divided tips 61, 62 formed by twisting a flat strip made of epoxy resin around a longitudinal center axis, with the distal divided tip 61 being on the distal end side and the proximal divided tip 62 being on the proximal end side.

[0053] The split tips 61, 62 have a wire insertion hole formed in the center that extends in the longitudinal direction, and the tip connecting linear member 30 passes through this wire insertion hole. The front split tip 61 and the rear split tip 62 are fixed to the tip connecting linear member 30 at a predetermined distance apart.

[0054] The diameter of the wire insertion hole is 2 mm, which is smaller than the outer diameter of 2.5 mm of the cover tube 35 of the tip connecting linear member 30. However, the outer diameter of the tip connecting wire 31 is 0.6 mm, the thickness of the cover tube 35 is 0.5 mm, and the sum of the outer diameter of the tip connecting wire 31 and twice the thickness of the cover tube 35 (1.6 mm) is smaller than the diameter of the wire insertion hole 41, so the tip connecting linear member 30 can pass through the wire insertion hole 41 while the resin cover tube 35 is deforming.

[0055] At this time, the divided tips 61, 62 are fixed at predetermined locations on the tip connecting linear member 30 by the frictional force with the deformed cover tube 35, but by applying a force to the intrusion prevention tip that exceeds this frictional force, it is possible to slide the divided tips 61, 62 to any position relative to the tip connecting linear member 30. The length of the prostate tip 60 can be adjusted by adjusting the distance between the divided tips 61 and 62.

[0056] When the prostate chip 60 is placed in the prostatic urethra B, the screw-shaped divided chips 61, 62 widen the prostatic urethra B, and the gaps in the twisted screw shape form a passageway for urine, allowing for smooth urination.

[0057] Therefore, the second embodiment, which employs a tip connecting linear member 30 configured similarly to the first embodiment, also achieves the same effects as the first embodiment. Furthermore, in this embodiment, a bladder tip 45 is provided on the distal end of the prostate tip 60, which is located within the bladder A when the urethral indwelling device 2 placed in the indwelling position, and when the urethral indwelling device 2 attempts to slip out toward the proximal end, the bladder tip 45 catches on the entrance to the bladder A (internal urethral sphincter J), preventing it from slipping out.

[0058] That is, even in the second embodiment, by employing a tip connecting linear member 30 made of a superelastic alloy in a roughly arc shape with a central angle of approximately 100°, once the urethral retaining device 2 is placed in the desired position, it is possible to prevent movement either toward the back or toward the handle, and furthermore, the entry prevention tip 40 can reliably prevent movement toward the back, and the bladder tip 45 can reliably prevent movement toward the handle, thereby making it possible to further stabilize the placement of the urethral retaining device 2.

[0059] Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above embodiments and various modifications are possible within the scope of the gist of the present invention. For example, the materials, shapes, sizes, etc. of the components constituting the urethral indwelling device can be changed as appropriate.

[0060] Furthermore, the tip connecting wire made of a superelastic alloy can prevent, to some extent, the urethral indwelling device from shifting from its placement position when it is placed in the urethra, so the penetration prevention tip may be omitted. Furthermore, the central angle of the approximately arc-shaped tip connecting wire can also be changed as appropriate; a central angle of approximately 60 to 130° is sufficient to match the placement position to the shape of a typical urethra, and a central angle of 90 to 110° is even more desirable.

[0061] Furthermore, in the above embodiment, the tip coupling wire is covered with the cover tube, but the tip coupling linear member may be composed of only the tip coupling wire. [Explanation of symbols]

[0062] 1,2 Urethral indwelling device 10 Prostate Chip 10a Connection hole 11 Connection cover 20 Bulbous Urethral Tip 30 Chip connecting linear member 31 Tip connecting wire 35 Cover Tube 40 Anti-entry chip 41 Wire insertion hole 45 Communication hole 45 Bladder on a Chip 46 Connection cover 50 Retrieval connection string 60 Prostate Chips 61 Tip side split tip 62 Rear end split chip A Bladder B. Prostatic urethra C bulbar urethra D Pendulum urethra E. External urethral meatus J internal urethral sphincter K External urethral sphincter

Claims

1. In a urethral retainer that is placed in the urethra, a prostate chip located at the tip side and placed in the prostate; a bulbar urethral tip located on the proximal side and placed in the bulbar urethral portion; a tip connecting wire made of a superelastic alloy that connects the prostate tip and the bulbar urethral tip; wherein the tip connecting wire has a shape memorized into a substantially arc shape with a central angle of 60 to 130 degrees.

2. 2. The urethral retention device according to claim 1, wherein the tip connection wire is covered with a flexible resin cover tube, and the tip connection wire and the cover tube are integrally connected to the prostate tip and the bulbar urethral tip.

3. a tip that is connected to the tip connecting wire and the cover tube between the prostate tip and the bulbar urethral tip, and that is sized to prevent the prostate tip from colliding with an internal urethral sphincter in the urethra and from advancing further; The urethral retention device according to claim 2, characterized in that the intrusion-prevention tip has an insertion hole formed therein, the diameter of which is smaller than the outer diameter of the cover tube and through which the tip connecting wire and the cover tube pass, and is slidable relative to the tip connecting wire and the cover tube, and can be fixed in a predetermined position by friction with the cover tube.

4. 2. The urethral retention device according to claim 1, wherein the bulbous urethral tip has a flattened shape and is connected and fixed to the tip connecting wire in an orientation perpendicular to a plane including the tip connecting wire, which has a substantially arcuate shape.

5. 2. The urethral retention device according to claim 1, wherein the prostate tip has a flattened shape and is connected and fixed to the tip connecting wire in an orientation perpendicular to a plane including the tip connecting wire, which has a substantially arcuate shape.

6. A bladder chip is further provided on the distal side of the prostate chip, 2. The urethral indwelling device according to claim 1, wherein the tip connecting wire connects the bladder tip, the prostate tip, and the bulbar urethral tip.

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