JP3947844B2 - Urethral stent delivery system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a urethral stent made of shape memory alloy and a urethral stent delivery system equipped with the stent. More specifically, the present invention has a small outer diameter and can be stably fixed to the urethra. The present invention relates to a urethral stent delivery system that allows safe insertion into the urethra and accurate placement.
[0002]
[Prior art]
Conventionally, a urethral stent installed in a stenotic site such as a urethra is a method of expanding a stenosis part by expanding a balloon using a balloon catheter, a method of placing a pipe having a predetermined outer diameter in a stenosis site, a shape memory polymer Japanese Patent Application Laid-Open No. Sho 62-201163 discloses that a stent using a urethra is placed in a urethral stricture, and a method for placing a shape memory alloy stent in a stenotic site is particularly disclosed in Japanese Patent Application Laid-Open No. 4-256759. It is disclosed in the gazette. This stent has a spiral or coiled structure made of a metal wire with shape memory function, and is used for dilatation of the urethra, ureter, bladder top, bile duct, blood vessel, esophagus, trachea, intestine, etc. The As a method of using these urethral stents, as shown in FIG. 9, a stent 6 is usually installed at the distal end of the stent set tube 2D, and a hot water introduction tube 2C is provided at the rear of the stent 6. The delivery system is inserted through the urethra and positioned when it reaches a predetermined stenosis. Next, the stent 6 is expanded after the stent 6 is expanded by ejecting hot water injected from 2A from 2B.2DIt consists of extracting. Since this stent delivery system is originally made on the assumption that an endoscope is inserted into the stent set tube 2D and operated while observing the inside, the stent set tube 2D itself of this stent delivery system is used. Therefore, the diameter of the stent set in the stent set tube 2D is also large.
[0003]
[Problems to be solved by the invention]
However, as described above, in the method of expanding the stenosis portion by expanding the balloon using the balloon catheter, it is necessary to increase the thickness of the balloon so that the balloon is not damaged at the time of expansion. Therefore, there is a problem that it is very difficult to insert into and place in a small diameter urethra. Further, the method of placing a pipe having a predetermined outer diameter in a constricted region has a problem that stable placement after insertion is not sufficient because the outer diameter of the pipe is constant. Furthermore, the stent disclosed in Japanese Patent Application Laid-Open No. 4-256759 is preferable in that it is expanded and held after placement, and stable placement is possible, but a constant outer diameter is maintained even after placement. Therefore, there is a possibility that the indwelling position may shift with time, and there is a problem that it cannot be said that the indwelling position is sufficiently stable. Further, as shown in FIG. 9, in the conventional stent delivery system, the outer diameter of the stent is not only thick but also the stent delivery system itself is made of a thick tube, so that it is difficult to insert the system at the time of insertion. However, even if it can be inserted, it is difficult to push the system forward, which can result in damage to the urethra, thus causing pain to the patient.TheSince the stent 6 is only installed at the distal end portion of the stent set tube 2D, the stent cannot be pulled back at the time of positioning. Therefore, there is a problem that much labor is consumed for accurate positioning.
[0004]
Therefore, as a result of intensive studies on these various problems, the present inventors have expanded the entire urethral stent with hot water and at least one end or both ends of the urethral stent into a shape having an expanded portion such as a trumpet shape. A spiral memory or coiled stent made of a shape memory alloy that has been machined into a small diameter (pre-thinned) can be safely operated in the stenosis of the urethra, can be pulled back, and is positioned accurately after placement. In addition to finding out that displacement can be prevented and extremely stable indwelling can be achieved, the present invention has further completed a urethral stent delivery system equipped with the stent. Therefore, the first problem to be solved by the present invention is to provide a urethral stent that can be placed in a stenotic region with warm water and can be placed accurately, and can be placed in a very stable manner without any risk of displacement after placement. There is. In addition, the second problem to be solved by the present invention is that it can be operated safely and can be pulled back, there is little burden on the patient (pain etc.), and the proficiency level of the technician in using the stent delivery system is reduced. Nevertheless, it is an object of the present invention to provide a urethral stent delivery system that can be easily operated and can be placed accurately and reliably.
[0005]
[Means for Solving the Problems]
The above-described problems of the present invention are achieved by the following inventions.
[0006]
  (1) A check valve member which is connected to a lock member by a plurality of connectors and has a side arm made of a hot water introduction tube and another hot water introduction tube, and these, a stent set tube, a pushing tube and a cover tube, A urethral stent delivery system having a tube member inserted concentrically in this order, having a flare at the tip of the hot water introduction tube, a hemispherical body at the tip of the stent set tube, and The tube is provided with a urethral stent made of a shape memory alloy, and a stent set tube having a plurality of through holes around the tube surface corresponding to the position of the stent, and the rear portion of the pushing tube Has a stopper and a tapered extension at the rear end of the cover tube. Urethral stent delivery system according to claim Rukoto.
  (2) The urethral stent delivery system according to (1), wherein the through hole is provided in a direction in which warm water is jetted backward.
[0007]
The urethral stent delivery system of the present invention comprises a check valve member connected to a lock member by a plurality of connectors and having a side arm made of a hot water introduction tube and another hot water introduction tube, these and a stent set tube, A urethral stent delivery system having a tube member in which a pushing tube and a cover tube are inserted concentrically in this order, having a flare at the tip of the hot water introduction tube, and a hemispherical body at the tip of the stent set tube And a urethral stent made of a shape memory alloy is installed on the tube, and a stent set tube having a plurality of through holes around the tube surface corresponding to the installed position of the stent. A stopper at the rear of the pushing tube, The rear end of the probe is characterized by having a taper-shaped extension. With such a configuration, it can be operated safely and can be pulled back, and there is less burden on the patient (such as pain). When using the stent delivery system, it can be easily operated regardless of the skill level of the operator, and has an especially remarkable effect that it can be placed accurately and reliably. In particular, since the head of the distal end portion of the stent set tube has a hemispherical body, stable operation is possible without damaging the contact portion such as the urethra when using the stent delivery system.
[0008]
The invention described in Item 2 of the present invention is the invention described in Item 1, wherein the through hole provided in the stent set tubeHot waterBy being provided in the direction of spraying, the warm water that has flowed out of the flare flows toward the tip of the stent set tube of the stent, and is sequentially jetted backward from the hole near the tip, so that the stent is It is expanded, and it is expanded to a predetermined shape cleanly without being tangled by irregular expansion. Therefore, there is an excellent effect that the halfway expansion and the positioned position do not shift..
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to these examples.
[0010]
FIG. 1 is a side view showing a urethral stent delivery system of the present invention. FIG. 2 is an exploded view of the urethral stent delivery system of the present invention. FIG. 3 is a partial side view showing the stent attached to the stent set tube. FIG. 4 is a side view showing an expanded shape of the stent of the present invention. FIG. 5 is a side view showing a through hole provided in the stent set tube. FIG. 6 is a cross-sectional view showing the direction of the through holes. FIG. 7 is a partial cross-sectional view showing the vicinity of the check valve. FIG. 8 is a schematic diagram showing a stent attached to the urethra. FIG. 9 is a perspective view showing a conventional stent and urethral stent delivery system.
[0011]
The urethral stent delivery system according to the first aspect of the present invention is shown in FIG. 1, and in the enlarged view of FIG. 1, a hot water introduction tube 1, a stent set tube 2, a stent 6, a pushing tube 3 and a cover tube 4. Are inserted concentrically. In FIG. 1, the stent 6 of the present invention is inserted into the stent set tube 2, attached to the distal end portion, and further fixed by the pushing tube 3. At this time, since the neck portion 22 adjacent to the head portion 21 is provided at the tip, the stent 6 does not fall out even if the urethral stent delivery system is retracted during operation. Further, the stent set tube 2 is generally thinner than the conventional one, and the head at the tip is rounded like a hemisphere, so that stable insertion can be performed without damaging the urethra and the like. Furthermore, since the stent 6 installed in the stent set tube 2 is protected by the cover tube 4, the insertion into the urethra is performed smoothly, and the cover tube can be moved backward when the stent 6 is expanded. . Further, the stent set tube 2 of the urethral stent delivery system is connected to the check valve member 10, and the pushing tube 3 inserted in the stent set tube 2 moves the stent set tube 2 concentrically back and forth. be able to. On the other hand, the hot water introduction tube 1 has a hot water introduction port 8 and penetrates the check valve member 10 and is inserted into the stent set tube 2. Further, the check valve member 10 has a side arm 5 made of a hot water introduction tube, and has a hot water introduction port 7 at its end.
[0012]
FIG. 2 shows the individual parts disassembled from the urethral stent delivery system of the present invention. 2A has a structure in which a hot water introduction tube is incorporated in a check valve member 10, a hot water introduction tube 1 penetrating the check valve member 10 is set, and the check valve member 10 further includes A side arm 5 made of a hot water introduction tube is provided. A hot water inlet 7 is provided at the tip of the side arm 5, and hot water is introduced from the hot water inlet 7 when the rear end side of the stent 6 is expanded. In addition, since the tip of the hot water introduction tube 1 provided through the check valve member 10 has a flare 12, the tip of the flare 12 is used as appropriate in a region having a plurality of holes in the stent set tube 2 during use. It arranges so that it may be located in the place (the latter part is good). Even if hot water is introduced into the hot water introduction tube of the side arm 5, the wall of the flare 12 does not circulate forward from the flare position. When hot water is introduced into the hot water introduction tube 1, it circulates forward. In this way, the flow of warm water introduced from the side arm 5 and the warm water introduced into the warm water introduction tube 1 can be separated by the flare 12.
[0013]
FIG. 2 b shows the stent set tube 2, which has a neck portion or a connection portion 22 for connecting the head portion 21 at the distal end portion, where the distal end of the stent set tube 2 is connected. The head 21 is preferably rounded with no corners so as not to damage the urine wall or the like when inserted into the urethra, and is preferably hemispherical, for example, a round chip type. The stent 6 is installed at the distal end portion of the stent set tube 2. At this time, the stent 6 can be prevented from falling off by having the head portion 21 to the neck portion 22. FIG. 2 c shows the pushing tube 3, and a stopper 31 is provided at the rear of the pushing tube 3. The stent 6 is covered with a cover tube 41 as shown in FIG. Therefore, when the cover tube 41 is retracted to expose the entire stent 6, the position of the cover tube 41 where the entire stent is exposed cannot actually be seen. It is positioned by. Thus, if the cover tube 41 is retracted to the stopper 31, the entire stent is exposed. The pushing tube 3 functions to be inserted into the stent set tube 2 to fix the stent 6 at the distal end position. FIG. 2d shows the cover tube 4, which has an extended portion 41 at the rear end thereof. The extension 41 is connected to the stopper 31 provided on the pushing tube 3.AdhesionFixed.
[0014]
  As shown in FIG. 3a, the stent set tube 2 has a head 21 connected to the tip of the stent set tube 2 by a neck or a connecting portion 22 to prevent the stent 6 from falling off the tip. Since it is round and round tip type and prevents the urethra from being damaged when inserted into the urethra, it can be safely operated when using the urethral stent delivery system. Further, as shown in FIG. 3b, the stent set tube 2 used in the present invention may have a hole through which the central portion of the head 21 passes, and in this case, the local state of the patient In some cases, a guide wire is introduced into a local area of the tube of the stent delivery system through the head 21 at the tip of the stent set tube 2, and the stent delivery system is guided around the guide wire. The diameter of the hole or inner hole penetrating through the central portion of the head 21 has a diameter 26 a that is somewhat narrower than the inner diameter of the stent set tube 2 at the head 21. This prevents a part of the urethral wall or the like from being sandwiched between the hole 26a and the inner hole 26 when the guide wire is passed. However, the present invention is not limited to this, and in the present invention, as shown in FIG. 3 c, the inner hole 26 of the head 21 attached to the stent set tube 2.bMay be the same as the inner diameter of the stent set tube 2. In the present invention, the stent 6 is wound around the stent set tube 2, but is previously formed into a thin coil shape (small diameter processing) and then inserted into the stent set tube 2. Hold with tube 3 and fix. In the present invention, as shown in FIG. 5, a plurality of through holes 23 (also referred to as side holes) are provided in the vicinity of the distal end portion of the stent set tube 2. Hole 23(23a, 23b, 23c)These positions may be provided on the wall surface of the stent set tube 2 in a circumferential shape, a spiral shape, or other regular or irregular shapes, and the hole on the wall surface may be provided at a different density. It is preferable to provide a biased density. In this example, the through-hole 23 is provided in a direction to be ejected backward, and thus hot water is ejected in the rear direction. As a result, the hot water is ejected and circulated from the front end side to the rear end side. The direction of the hole is not limited to the rear, but may be forward or vertical. The plurality of through holes 23 provided in the vicinity of the distal end portion of the stent set tube 2 are preferably provided over the length of the stent 6, and in this case, the through holes 23 and the through holes 23 are provided.
Is appropriately determined according to the length of the stent and the number of through holes 23. On average, it is 2 to 20 mm, preferably 5 to 10 mm. Further, the shape of the through hole may be any shape such as a circular cross section, an elliptical shape, or a square shape.
[0015]
In FIG. 6, “a” in FIG. 6 is a longitudinal sectional view having a hole 24. 6c shows a direction in which the through hole 23 provided in the wall surface of the stent set tube 2 is ejected rearward as described above, and FIG. 6d shows that the through hole 24 is perpendicular to the tube wall. Further, e in FIG. 6 is a direction in which the through hole 25 is ejected to the tip side. FIG. 6 b shows a case where these through holes 23, 24, 25 exist in a mixed manner. For example, when hot water is introduced from the hot water introduction tube of the side arm 5, as shown in FIG. 5, the tip (flare) of the hot water introduction tube 1 is a place where a through hole is provided, Located in the rear part. Further, the direction of the through hole provided in the rear portion from the flare 12 may be set to be perpendicular to the wall surface as shown in FIG. In addition, when two or more types having different orientations of the through holes are mixed, those having different orientations may be evenly mixed or partially different.
[0016]
  The present inventionUsed forAs shown in FIG. 4, the stent 6 has an outer diameter R0, R1, R2, R3, and R4, as shown in FIG. 4, and the relationship of R0 <R1 <R3 <R2 = R4. The outer diameter of R is preferably 7≤R1≤25, 9≤R2≤40, and further 8≤R3≤39. In FIG. 4, the length of the stent 6 before expansion is 10 mm to 150 mm, preferably 50 mm to 90 mm. The shape of the stent 6 is indicated by 6a and is composed of the same outer diameter R0. The length after expansion is 5 mm to 100 mm, preferably 20 mm to 70 mm, more preferably 30 mm to 60 mm. There are various shapes after expansion and outer diameters R1, R2, and R3. The main body outer diameter R0 before expansion of the stent 6 is preferably 5 mm, and the main body outer diameter R1 after expansion is preferably 10 to 11 mm, and more preferably 10 mm. The outer diameters R2 and R3 at one end or both ends may be larger than R1, but preferably R2 is 12 to 13 mm and R3 is 13 to 16 mm. In the stent 6 shown in FIG. 4 a, both side ends of the stent 6 are expanded into a conical shape 62. Thus, by having the expansion part 62 in both ends, there exists an advantage that a position shift does not generate | occur | produce easily when inserting the stent 6 in a urethra or after insertion. The present inventionUsed forWhen the stent 6 is expanded, the outer diameter R0 expands to R1. That is, the relationship of R0 <R1 is established. Further, the outer diameters of the extended portions 62, 62 at both ends at the time of expansion are the cases where R2 and R3 are equal, that is, R1 <R2 = R3. In the stent 6 shown in FIG. 4b, one end 60 has an outer diameter of R1, and the expanded portion of the other end 62 is R2. That is, R1 <R2. In the stent 6 shown in FIG. 4c, the outer diameter of the expanded portion 61 is R3, which is smaller than R2. That is, R1 <R3 <R2.
[0017]
      The stent 6 shown in FIG. 4d is expanded into a conical shape 63 having both ends of the stent 6 having the same diameter. Thus, by having the expansion part 63 at both ends, there is an advantage that the positional deviation hardly occurs when the stent 6 is inserted into the urethra or after the insertion. The present inventionUsed forIn the stent 6, the outer diameters of the expanded portions 63 and 63 at both ends at the time of expansion are the cases where R4 and R4 are equal, that is, R1 <R4 = R4. In the stent 6 shown in FIG. 4e, one end 60 has an outer diameter of R1, and the expanded portion of the other end 63 is R4. That is, R1 <R4. In the stent 6 shown in FIG. 4F, the outer diameter of the expanded portion 61 is R3, which is smaller than R4. That is, R1 <R3 <R4. Thus, the present inventionUsed forDepending on the length or thickness of the patient's urethra and the situation inside the urethra, the stent 6 can be used by appropriately selecting dimensions, sizes, and shapes as shown in FIG. As for the shape of the extension part, the extension part 63 is more preferable than the extension part 62 in that stable placement is possible. The present inventionUsed forExamples of the material used for the stent 6 include a shape memory alloy disclosed in JP-A-4-256759, preferably a TiNi alloy, a Cu—Zn—Al alloy, a Cu—Al—Ni alloy, or the like. The present inventionUsed forFor example, the stent 6 is memorized by heat-treating the expanded shape of the TiNi alloy wire stent at a high temperature. Next, the small diameter processing is performed at room temperature. The shape returns to a shape memorized at a temperature of 55 ° C. or higher, that is, a shape having an extension.
[0018]
FIG. 7 is a partial cross-sectional view showing the vicinity of the check valve. In FIG. 7, the check valve member 10 has a check valve 65, and the check valve 65 includes the hot water introduction tube 1. It has a through hole that can be penetrated. The check valve housing 66 has a side arm 5 through which hot water is introduced. One end of the check valve member 10 is composed of a double connecting pipe consisting of an inner pipe 66a and an outer pipe 66b, and a check valve connecting connector 64 is connected between them, and a hot water introduction tube is connected to the other end. A male hot water introduction tube lock connector 67 having a clamping valve 68 is connected, and a female hot water introduction tube lock connector 69 is connected.The female hot water introduction tube lock connector 69 has an inner tube 69a and an outer tube 69b as concentric circles. SaidThe hot water introduction tube clamping valve 68 is made of a silicone tube and has flexibility. Therefore, when the female hot water introduction tube lock connector 69 is connected to the male warm water introduction tube lock connector 67, the hot water introduction tube clamping valve 68 is connected to the inner tube. The hot water introduction tube 1 can be fastened and fixed by being pressed by the tip of 69a and fixed by the strain. Further, the check valve connection connector 64 includesstopper72, a stent set tube connection connector 71 containing 72 is connected by a connector connection member 73;Connector 71Is attached with a stent set tube 2.stopperFor example, a polyvinyl chloride tube or the like is used for 72.stopperBy having 72, the inner diameter of the stent set tube 2 is secured, and the role of maintaining the shape through which hot water flows is maintained. That is, when the stent set tube 2 is inserted deep into the connector 71, there is no gap (clearance) between the stent set tube 2 and the hot water introduction tube 1, and the hot water from the hot water introduction tube of the side arm 5 is removed. This is to prevent the passage. When the female hot water introduction tube lock connector 69 is connected to the connector 67, the lock connector 69 is rotated, whereby the tip of the clamping valve 68 in the connector 67 is pushed to cause distortion. The introduction tube 1 is fixed. Therefore, the flare 12 at the tip of the hot water introduction tube 1 can be positioned at a desired location in the stent set tube 2 and can be fixed by the lock connector 69. Thus, after a plurality of connectors are connected to the check valve member 10, the hot water introduction tube 1 is provided so as to penetrate through the through holes in the central portion thereof.
[0019]
In the present invention, the stent of the present invention is used after being attached to the urethral stent delivery system as described above, but these are all radiopaque or contrast agents (for example, barium sulfate, bismuth carbonate, etc. ) Is X-ray opaque by being coated or mixed. The stent may be attached either before or during use of the system, but it is preferable to use a stent in which a stent is set in the urethral stent delivery system before use. The stent and urethral stent delivery system of the present invention places a stent 84 in the urethra 82 as shown in FIG. That is, a method for placing a stent in the urethra using a urethral stent delivery system having a stent 84 at the tip will be described. In FIG. 8, in the urethral stent delivery system, the flare 12 of the hot water introduction tube 1 is attached to the stent set tube 2. After moving to the position immediately before the through holes 23a, 23c provided in the vicinity of the rear part of the attached stent 6, the lock member 69 is rotated and fixed. Next, while monitoring the distal end of the urethral stent delivery system using X-ray imaging or ultrasonic imaging, the urethral stent delivery system is inserted into the urethra 82 leading to the bladder 81, and when the sphincter muscle 83 is approached, carefully sphincter muscles. 83 so that the rear end of the stent 84 attached to the distal end of the stent set tube 85 (expansion portion 84a is formed) extends beyond the sphincter 83 and is located between the prostatic urethral entrance 86. Determine the detention position. At this time, the stent set tube 85 can be moved back and forth to determine the position. When positioned, the distal end of the stent set tube 85 protrudes into the bladder. In this state, the cover tube 4 covering the stent 84 is retracted to the stopper position provided in the pushing tube 3. Next, hot water of 45 ° C. to 65 ° C. is injected from the side arm 5. As an example, preferably, hot water of 60 ° C. is injected, and the hot water is ejected from the through holes 23 a, 23 b, and 23 c provided in the rear portion of the through holes 23 provided in the stent set tube 2. The rear portion of the stent 84 is expanded by the hot water, and an expanded portion 84a is formed. This ensures that the stent 84 is indwelled at the indwelling position. In this example, the through holes 23a, 23b, and 23c are used as the rear through holes, but a vertical type of the through holes 24 can be used instead of the through holes 23a, 23b, and 23c.
[0020]
Next, hot water at 55 ° C. is injected from the hot water introduction tube connector, with the indwelling position at the rear part as the starting point of expansion of the stent. Hot water is ejected from the front end portion of the stent 84 toward the rear end portion. The stent 84 is expanded from the distal end portion (bladder outlet) toward the rear portion (urethral entrance), and the whole is expanded and placed. In this way, by expanding the stent 84 from the distal end portion toward the rear portion, the stent 84 is evenly arranged without shifting from the bladder outlet to the urethral entrance, that is, without shifting the stent. After placing the stent 84 in this way, the urethral stent delivery system is removed. At this time, since the stent 84 is expanded as a whole, the stent 84 has an excellent effect that the removal of the urethral stent delivery system after placement is very easy.
[0021]
【The invention's effect】
The urethral stent delivery system of the present invention comprises a check valve member connected to a lock member by a plurality of connectors and having a side arm made of a hot water introduction tube and another hot water introduction tube, these and a stent set tube, A urethral stent delivery system having a tube member in which a pushing tube and a cover tube are inserted concentrically in this order, having a flare at the tip of the hot water introduction tube, and a hemispherical body at the tip of the stent set tube And a urethral stent made of a shape memory alloy is installed on the tube, and a stent set tube having a plurality of through holes around the tube surface corresponding to the installed position of the stent. A stopper at the rear of the pushing tube, It is characterized by having a taper-shaped extension at the rear end of the probe. With such a configuration, it can be safely inserted into the urethra without being damaged, can be operated safely, and can be pulled back. It is possible to reduce the burden (pain etc.) on the patient, and when using the stent delivery system, it can be easily operated regardless of the skill level of the operator and can be placed accurately and reliably. Is.
[0022]
According to the second aspect of the present invention, in the invention according to the first aspect, the through hole provided in the stent set tube is provided in the direction in which the hot water is jetted backward, so that the flare is removed from the flare. Since the hot water circulates toward the tip of the stent set tube of the stent and sequentially ejects backward from the hole near the tip, the stent is expanded from the tip side, and it is clean without being tangled by irregular expansion. Expanded to a predetermined shape. Therefore, there is an excellent effect that the halfway expansion and the positioned position do not shift..
[Brief description of the drawings]
FIG. 1 is a side view showing a urethral stent delivery system of the present invention.
FIG. 2 is an exploded view of the urethral stent delivery system of the present invention.
FIG. 3 is a partial side view showing a stent attached to a stent set tube.
FIG. 4 shows the present invention.Used forIt is a side view which shows the expansion shape of a stent.
FIG. 5 is a side view showing a through hole provided in the stent set tube.
FIG. 6 is a cross-sectional view showing the direction of a through hole.
FIG. 7 is a partial cross-sectional view showing the vicinity of a check valve.
FIG. 8 is a schematic diagram showing a stent attached to the urethra.
FIG. 9 is a perspective view showing a conventional stent and urethral stent delivery system.
[Explanation of symbols]
    1,2C Hot water introduction tube
    1A Instrument insertion slot
    1B Instrument or tube flush mouth
    1C Tube tip
    2, 2D stent set tube
    2A hot water inlet
    2B Hot water jetting part
    3 Pushing tube
    4 Cover tube
    5 Side arm (another hot water introduction tube)
    6 Stent
    6a Stent before expansion
    7, 8 Hot water inlet
    9, 69 Lock member
    10 Check valve member
    10a Check valve body
    11 Pushing tube stopper body
    11a Pushing tube stopper abutting part
    11b Pushing tube stopper holder
    12 Flares
    21 head
    22 neck
    23, 24, 25 Through hole
    23a, 23b, 23c Through holes provided in the rear
    26 Inner hole
    26a narrow inner hole
    26b Inner hole with the same diameter as the inner diameter of the stent set tube
    31, 72 stopper
    41 Extension
    60 Tip shape
    61, 62, 63 Extension
    64, 67, 71 connectors
    65 Check valve
    66 Check valve housing
    66a Inner pipe
    66b outer pipe
    68 Fixing member
    69a Inner pipe
    69b Outer pipe
    73 Connection member
    81 bladder
    82 Urethra
    83 Sphincter
    84 Expanded stent
    84a trumpet-shaped extension
    85 stent set tube
    86 Prostatic urethral entrance
    87 Bladder outlet
    88 prostate
    R0, R1, R2, R3, R4 Stent diameter

Claims (2)

It consists of a check valve member that is connected to the lock member by a plurality of connectors and has a side arm made up of a hot water introduction tube and another hot water introduction tube. A urethral stent delivery system having a tube member inserted in a shape, having a flare at the distal end of the hot water introduction tube, a hemispherical body at the distal end of the stent set tube, and the tube A urethral stent made of shape memory alloy, and a stent set tube having a plurality of through holes around the tube surface corresponding to the installed position of the stent, and a stopper at the rear of the pushing tube The cover tube has a tapered extension at the rear end. Urethral stent delivery system according to claim. The urethral stent delivery system according to claim 1, wherein the through hole is provided in a direction in which hot water is jetted backward.

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