JP3214733B2 - Urethral stent - Google Patents
Urethral stentInfo
- Publication number
- JP3214733B2 JP3214733B2 JP21178192A JP21178192A JP3214733B2 JP 3214733 B2 JP3214733 B2 JP 3214733B2 JP 21178192 A JP21178192 A JP 21178192A JP 21178192 A JP21178192 A JP 21178192A JP 3214733 B2 JP3214733 B2 JP 3214733B2
- Authority
- JP
- Japan
- Prior art keywords
- urethral stent
- point
- shape
- present
- expanded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F2/88—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure the wire-like elements formed as helical or spiral coils
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2002/041—Bile ducts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2210/0014—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof using shape memory or superelastic materials, e.g. nitinol
- A61F2210/0019—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof using shape memory or superelastic materials, e.g. nitinol operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0067—Three-dimensional shapes conical
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、人体の前立腺部尿道
に挿入、留置して、前立腺肥大症による尿閉や排尿障害
を治療するのに適した尿道ステントに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a urethral stent which is inserted into the prostatic urethra of a human body and placed therein to treat urinary retention and dysuria due to benign prostatic hyperplasia.
【０００２】[0002]
【従来の技術】従来、この種の尿道ステントは、例えば
図８に示したように、コイル状の円錐形とした先端部１
とコイル状の円筒形とした胴体部２を直結し、さらにこ
の胴体部２に引出片７を直線部８で連結したものが存在
する。そして、前記尿道ステントは、内部にインサート
用カテーテルを挿入し、ガイド用カテーテルにより誘導
して、人体の前立腺部尿道に挿入している。2. Description of the Related Art Conventionally, a urethral stent of this kind has a coiled conical distal end 1 as shown in FIG.
And a body part 2 having a coiled cylindrical shape, which is directly connected to the body part 2, and a drawing piece 7 is connected to the body part 2 by a straight part 8. The urethral stent has an insertion catheter inserted therein, guided by a guide catheter, and inserted into the prostatic urethra of the human body.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前記従
来の尿道ステントでは、人体の前立腺部尿道に留置する
場合に、内視鏡によったり、超音波断層法によって位置
決めしているが、このよな方法では、位置決めが困難で
あったり、機械操作が面倒であったりするという課題を
有していた。However, when the conventional urethral stent is placed in the prostatic urethra of the human body, the stent is positioned by an endoscope or by an ultrasonic tomography method. The method has a problem that positioning is difficult and mechanical operation is troublesome.
【０００４】さらに、前記従来の尿道ステントは、全長
が約５０〜１００ｍｍ、外径が約７ｍｍ程度に形成され
ており、尿道ステントが膀胱内へ逸脱した場合や不要と
なった場合にもこの形状を維持したままであるので、尿
道から取り出し難いという課題を有していた。そこで、
この発明の尿道ステントは、上記従来の課題を解決する
ことを目的としてなされたものである。Further, the conventional urethral stent is formed to have a total length of about 50 to 100 mm and an outer diameter of about 7 mm. This shape can be used even when the urethral stent has protruded into the bladder or becomes unnecessary. Therefore, there is a problem that it is difficult to remove the urethra from the urethra. Therefore,
The urethral stent of the present invention has been made to solve the above-mentioned conventional problems.
【０００５】[0005]
【課題を解決するための手段】そのため、この発明の尿
道ステントは、３５〜４０°ＣのＭｓ点を有し、前記Ｍ
ｓ点以下では円筒形とした先端部１と円筒形とした胴体
部２を空間部３を隔てて連結した形状とし、前記Ｍｓ点
以上では先端部１が拡張した逆円錐形に変形すると共に
胴体部２が拡張した円筒形に変形して、先端部１と胴体
部２が直結した形状となる形状記憶合金からなるものと
している。Therefore, the urethral stent of the present invention has an Ms point of 35 to 40 ° C.
Below the s point, the cylindrical end portion 1 and the cylindrical body portion 2 are connected to each other with the space 3 therebetween. Above the Ms point, the distal end portion 1 is deformed into an expanded inverted conical shape and the body is formed. The part 2 is made of a shape memory alloy that is deformed into an expanded cylindrical shape and the tip part 1 and the body part 2 are directly connected.
【０００６】さらに、この発明の尿道ステントは、３５
〜４０°ＣのＭｓ点を有し、前記Ｍｓ点以下ではコイル
状の円筒形とした先端部１とコイル状の円筒形とした胴
体部２を空間部３を隔てて連結した形状とし、前記Ｍｓ
点以上では先端部１が拡張したコイル状の逆円錐形に変
形すると共に胴体部２が拡張したコイル状の円筒形に変
形して、先端部１と胴体部２が直結した形状となる形状
記憶合金からなるものとしてもよい。Further, the urethral stent of the present invention
It has an Ms point of ４０40 ° C. and below the Ms point, a coil-shaped cylindrical end portion 1 and a coiled cylindrical body portion 2 are connected to each other with a space 3 interposed therebetween. Ms
Above the point, the shape memory becomes such that the tip 1 is deformed into an expanded coil-shaped inverted conical shape and the body 2 is deformed into an expanded coil-shaped cylinder, and the tip 1 and the body 2 are directly connected. It may be made of an alloy.
【０００７】[0007]
【作用】この発明の尿道ステントは、上記手段を施した
ため、次のような作用を有する。先ず、この発明の尿道
ステントを前立腺部尿道に挿入、留置する場合には、バ
ルーンカテーテルを用いると、バルーン部を空間部３か
ら膨出させることができるので、このバルーン部により
膀胱頸部の位置を探り当てることができる。The urethral stent according to the present invention has the following effects due to the above means. First, when inserting and placing the urethral stent of the present invention in the prostatic urethra, the balloon can be expanded from the space 3 by using a balloon catheter. Can be found.
【０００８】さらに、この発明の尿道ステントを前立腺
部尿道から取り出す場合には、Ｍｓ点以下の温度にすれ
ば超弾性変形し、尿道ステントを伸長させて細くした円
筒形としたり、コイルを解いて細線とすることができ
る。Further, when the urethral stent of the present invention is taken out from the prostatic urethra, it is superelastically deformed when the temperature is lower than the Ms point, and the urethral stent is elongated into a thin cylindrical shape, or the coil is unraveled. It can be a thin line.
【０００９】[0009]
【実施例】以下、この発明の尿道ステントの構成を、一
実施例として示した図面に基づいて説明する。この発明
の尿道ステントは、３５〜４０°ＣのＭｓ点（マルテン
サイト変態発生点）を有した形状記憶合金からなるもの
としており、図１にはＭｓ点以下での形状を示してお
り、図２にはＭｓ点以上での形状を示している。３５〜
４０°ＣのＭｓ点を有する形状記憶合金としては、一般
的にチタン−ニッケル系、銅−亜鉛系などが知られてい
るが、この範囲のＭｓ点を有する形状記憶合金であれば
実施可能であり、形状記憶合金の組成については特に限
定されるものではない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a urethral stent according to the present invention will be described below with reference to the drawings shown as an embodiment. The urethral stent of the present invention is made of a shape memory alloy having an Ms point (martensitic transformation occurrence point) of 35 to 40 ° C. FIG. 1 shows a shape below the Ms point. 2 shows the shape above the Ms point. 35 ~
As a shape memory alloy having an Ms point of 40 ° C., a titanium-nickel system, a copper-zinc system, and the like are generally known, but any shape memory alloy having an Ms point in this range can be used. Yes, the composition of the shape memory alloy is not particularly limited.
【００１０】この発明の尿道ステントは、前記Ｍｓ点以
下では、図１に示したようにコイル状の円筒形とした先
端部１とコイル状の円筒形とした胴体部２を空間部３を
隔てて連結した形状としている。実施例では、先端部１
と胴体部２を連結するには直線形状とした連結部４を介
しているが、この連結部４は外方に湾曲した曲線形状等
としてもよい。[0010] In the urethral stent of the present invention, below the Ms point, a coiled cylindrical tip portion 1 and a coiled cylindrical body portion 2 are separated by a space portion 3 as shown in FIG. And connected. In the embodiment, the tip 1
The body 2 is connected to the body 2 via a connecting portion 4 having a linear shape. However, the connecting portion 4 may have a curved shape or the like curved outward.
【００１１】この発明の尿道ステントは、前記Ｍｓ点以
上では、図２に示したように先端部１が拡張したコイル
状の逆円錐形に変形すると共に胴体部２が拡張したコイ
ル状の円筒形に変形するものとしている。この場合、前
記連結部４も変形して、先端部１と胴体部５の形状に吸
収されてしまい、先端部４と胴体部５が直結した形状と
なる。The urethral stent of the present invention has a coil-shaped inverted conical shape in which the distal end portion 1 is expanded and the body portion 2 is expanded as shown in FIG. It is supposed to be transformed. In this case, the connecting portion 4 is also deformed and absorbed by the shapes of the distal end portion 1 and the body portion 5, so that the distal end portion 4 and the body portion 5 are directly connected.
【００１２】また、この発明の尿道ステントは、前記Ｍ
ｓ点以下での先端部１及び胴体部２の形状を網目状の円
筒形とし、前記Ｍｓ点以上での先端部１の形状を拡張し
た網目状の逆円錐形に変形すると共に胴体部２の形状を
拡張した網目状の円筒形に変形するもの等として実施す
ることもできる。なお、前記Ｍｓ点以下では、先端部１
の寸法は、直径を５ｍｍ程度、長さを５ｍｍ程度として
おり、胴体部２の寸法は、直径を５ｍｍ程度、長さを４
５ｍｍ程度としており、空間部３は１０ｍｍ程度の隔た
りとしている。そして、前記Ｍｓ点以上では、先端部１
の寸法は、円錐底の直径を１５ｍｍ程度、長さを５ｍｍ
程度に変形するようにしており、胴体部２の寸法は、直
径を７ｍｍ程度、長さを３０ｍｍ程度に変形するように
している。Further, the urethral stent of the present invention has the M
The shape of the tip portion 1 and the body portion 2 at and below the s point is a mesh cylindrical shape, and the shape of the tip portion 1 at and above the Ms point is deformed into an expanded mesh-shaped inverted cone and the body portion 2 The present invention can also be embodied as being deformed into a mesh-like cylindrical shape having an expanded shape. In addition, below the Ms point, the tip 1
Is about 5 mm in diameter and about 5 mm in length, and the dimensions of the body 2 are about 5 mm in diameter and 4 in length.
The gap is about 5 mm, and the space 3 is separated by about 10 mm. And, above the Ms point, the tip 1
The dimensions of the cone are about 15 mm in diameter and 5 mm in length
The dimensions of the body 2 are such that the diameter is about 7 mm and the length is about 30 mm.
【００１３】以上のように構成されたこの発明の尿道ス
テントを人体の前立腺部尿道に挿入、留置するには、次
のようにして行う。先ず、尿道ステントの空間部３がバ
ルーンカテーテル５のバルーン部５ａに位置するように
して、この発明の尿道ステントを、図３に示したように
バルーンカテーテル５の外周に装着する。そして、この
バルーンカテーテル５を、図４に示したように尿道１０
内に差し込み、バルーン部５ａが膀胱１１内に至るよう
にする。この状態でバルーンカテーテル５内に約５ｍｌ
の水を注入すると、バルーン部５ａが膨らんで尿道ステ
ントの空間部３から膨出する。そこで、バルーンカテー
テル５を取り出す方向に少し引き寄せると、図５に示し
たようにこのバルーン部５ａが膀胱頸部１１ａに当たる
ので、膀胱頸部１１ａの位置を探り当てることができ、
尿道ステントの空間部３をこの膀胱頸部１１ａに位置決
めすることができる。The insertion and placement of the urethral stent of the present invention constructed as described above into the prostatic urethra of the human body is performed as follows. First, the urethral stent of the present invention is mounted on the outer periphery of the balloon catheter 5 as shown in FIG. 3 so that the space 3 of the urethral stent is positioned at the balloon portion 5a of the balloon catheter 5. Then, the balloon catheter 5 is connected to the urethra 10 as shown in FIG.
The balloon portion 5a is inserted into the bladder 11. In this state, about 5 ml is placed in the balloon catheter 5.
When the water is injected, the balloon portion 5a expands and bulges out of the space 3 of the urethral stent. Then, when the balloon portion 5 is slightly pulled in the removing direction, the balloon portion 5a hits the bladder neck 11a as shown in FIG. 5, so that the position of the bladder neck 11a can be found.
The space 3 of the urethral stent can be positioned on the bladder neck 11a.
【００１４】次に、前記バルーンカテーテル５内の水を
排出させてバルーンを消退させ、バルーンカテーテル５
を通して３５〜４０°Ｃの温水を膀胱１１内に注入する
と、この温熱が熱伝導され尿道ステントがＭｓ点以上に
昇温して、図６に示したように形状変化するので、先端
部１が膀胱頸部１１ａに位置し、胴体部２が前立腺部尿
道１０ａ位置することになる。そして、この状態でバル
ーンカテーテル５を尿道１０内から引き抜くと、この発
明の尿道ステントは人体の前立腺部尿道に伸展したまま
留置することができる。Next, the water in the balloon catheter 5 is discharged to cause the balloon to retreat, and the balloon catheter 5
When warm water of 35 to 40 ° C. is injected into the bladder 11 through the through hole, this heat is conducted and the urethral stent rises in temperature above the Ms point and changes its shape as shown in FIG. It is located on the bladder neck 11a, and the torso 2 is located on the prostatic urethra 10a. When the balloon catheter 5 is withdrawn from the urethra 10 in this state, the urethral stent of the present invention can be placed in the prostatic urethra of the human body while being extended.
【００１５】さらに、尿道ステントの留置が不必要とな
ったり、交換する場合には、この発明の尿道ステント
は、次のようにして前立腺部尿道から取り出す。先ず、
バルーンカテーテル５を尿道１０から差し込み、前立腺
部尿道１０ａに留置された尿道ステント内にこのバルー
ンカテーテル５を挿入する。そして、このバルーンカテ
ーテル５内に約２５°Ｃ以下の冷水を注入すれば、この
冷熱が熱伝導され、体温に維持されていた尿道ステント
の温度がＭｓ点以下に降温する。すると、形状記憶合金
からなるこの発明の尿道ステントは、超弾性変形するの
で、図７に示したように伸長させて細くした円筒形とし
たり、図示していないがコイルを解いて細線とし、尿道
を通して取り出すことができる。Further, when the placement of the urethral stent becomes unnecessary or when the urethral stent is replaced, the urethral stent of the present invention is removed from the prostatic urethra as follows. First,
The balloon catheter 5 is inserted from the urethra 10, and the balloon catheter 5 is inserted into the urethral stent placed in the prostatic urethra 10a. Then, when cold water of about 25 ° C. or less is injected into the balloon catheter 5, the cold heat is conducted, and the temperature of the urethral stent, which has been maintained at the body temperature, falls to the Ms point or lower. Then, since the urethral stent of the present invention made of a shape memory alloy undergoes superelastic deformation, it is elongated as shown in FIG. Can be taken out through.
【００１６】[0016]
【発明の効果】この発明の尿道ステントは、以上に述べ
たように構成されているので、次のような効果を有す
る。先ず、この発明の尿道ステントを前立腺部尿道に挿
入、留置する場合には、バルーンカテーテルを用いる
と、バルーン部を空間部３から膨出させることができる
ので、このバルーン部により膀胱頸部の位置を探り当て
ることができ、前立腺部尿道に位置決めし易くなる。The urethral stent of the present invention has the following effects because it is configured as described above. First, when inserting and placing the urethral stent of the present invention in the prostatic urethra, the balloon can be expanded from the space 3 by using a balloon catheter. And it is easier to position the prostatic urethra.
【００１７】さらに、この発明の尿道ステントを前立腺
部尿道から取り出す場合には、Ｍｓ点以下の温度にすれ
ば超弾性変形し、尿道ステントを伸長させて細くした円
筒形としたり、コイルを解いて細線とすることができる
ので、尿道を通して簡単に取り出すことができる。Further, when the urethral stent of the present invention is taken out from the prostatic urethra, it is superelastically deformed when the temperature is lower than the Ms point, and the urethral stent is elongated into a thin cylindrical shape, or the coil is unraveled. Since it can be a thin line, it can be easily taken out through the urethra.
【図１】この発明の尿道ステントのＭｓ点以下での形状
を示す側面図である。FIG. 1 is a side view showing a shape of a urethral stent according to the present invention at a temperature of Ms or lower.
【図２】この発明の尿道ステントのＭｓ点以上での形状
を示す側面図である。FIG. 2 is a side view showing the shape of the urethral stent according to the present invention at a point Ms or higher.
【図３】この発明の尿道ステントを人体の前立腺部尿道
に挿入、留置する場合の説明図である。FIG. 3 is an explanatory view of a case where the urethral stent of the present invention is inserted into the prostatic urethra of a human body and placed there.
【図４】この発明の尿道ステントを人体の前立腺部尿道
に挿入、留置する場合の説明図である。FIG. 4 is an explanatory view showing a case where the urethral stent of the present invention is inserted into the prostatic urethra of a human body and is placed there.
【図５】この発明の尿道ステントを人体の前立腺部尿道
に挿入、留置する場合の説明図である。FIG. 5 is an explanatory view showing a case where the urethral stent of the present invention is inserted into the prostatic urethra of a human body and is placed.
【図６】この発明の尿道ステントを人体の前立腺部尿道
に挿入、留置する場合の説明図である。FIG. 6 is an explanatory view of a case where the urethral stent of the present invention is inserted into the prostatic urethra of a human body and is placed there.
【図７】この発明の尿道ステントを人体の前立腺部尿道
から取り出す場合の説明図である。FIG. 7 is an explanatory view when the urethral stent of the present invention is taken out from the prostatic urethra of a human body.
【図８】従来の尿道ステントの側面図である。FIG. 8 is a side view of a conventional urethral stent.
１ 先端部 ２ 胴体部 ３ 空間部 1 Tip 2 Body 3 Space
フロントページの続き (56)参考文献 特開 平４−256759（ＪＰ，Ａ) 特開 平２−274266（ＪＰ，Ａ) 特開 昭62−201163（ＪＰ，Ａ) 特開 昭64−68275（ＪＰ，Ａ) 実開 平４−35447（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) A61M 29/02 A61M 27/00 Continuation of the front page (56) References JP-A-4-256759 (JP, A) JP-A-2-274266 (JP, A) JP-A-62-1201163 (JP, A) JP-A-64-68275 (JP) , A) Hira 4-35447 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) A61M 29/02 A61M 27/00
Claims (2)
ｓ点以下では円筒形とした先端部１と円筒形とした胴体
部２を空間部３を隔てて連結した形状とし、前記Ｍｓ点
以上では先端部１が拡張した逆円錐形に変形すると共に
胴体部２が拡張した円筒形に変形して、先端部１と胴体
部２が直結した形状となる形状記憶合金からなることを
特徴とする尿道ステント。An Ms point of 35 to 40 ° C.
Below the s point, the cylindrical end portion 1 and the cylindrical body portion 2 are connected to each other with the space 3 therebetween. Above the Ms point, the distal end portion 1 is deformed into an expanded inverted conical shape and the body is formed. A urethral stent comprising a shape memory alloy in which a portion 2 is deformed into an expanded cylindrical shape and a tip 1 and a body 2 are directly connected.
ｓ点以下ではコイル状の円筒形とした先端部１とコイル
状の円筒形とした胴体部２を空間部３を隔てて連結した
形状とし、前記Ｍｓ点以上では先端部１が拡張したコイ
ル状の逆円錐形に変形すると共に胴体部２が拡張したコ
イル状の円筒形に変形して、先端部１と胴体部２が直結
した形状となる形状記憶合金からなることを特徴とする
尿道ステント。2. It has an Ms point of 35 to 40 ° C.,
Below the s point, a coiled cylindrical tip 1 and a coiled cylindrical body 2 are connected with a space 3 therebetween, and above the Ms point, the coiled tip 1 is expanded. A urethral stent comprising a shape memory alloy that is deformed into an inverted conical shape and is deformed into a coiled cylindrical shape in which the body 2 is expanded, so that the tip 1 and the body 2 are directly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21178192A JP3214733B2 (en) | 1992-08-07 | 1992-08-07 | Urethral stent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21178192A JP3214733B2 (en) | 1992-08-07 | 1992-08-07 | Urethral stent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0654913A JPH0654913A (en) | 1994-03-01 |
| JP3214733B2 true JP3214733B2 (en) | 2001-10-02 |
Family
ID=16611497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21178192A Expired - Fee Related JP3214733B2 (en) | 1992-08-07 | 1992-08-07 | Urethral stent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3214733B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005500890A (en) * | 2001-09-04 | 2005-01-13 | コックス，グラエム | Stent |
| JP2007319516A (en) * | 2006-06-02 | 2007-12-13 | Norikata Taguma | Gastrostomy tube using shape memory alloy and its use method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100443299B1 (en) * | 2002-05-16 | 2004-08-09 | 나공찬 | An apparatus for preventing vesicoureteral reflux |
| US20090177288A1 (en) * | 2005-10-29 | 2009-07-09 | Pnn Medical S.A. | Stent for Use in a Tubular Organ of a Body |
| JP2015036455A (en) | 2013-08-12 | 2015-02-23 | クリノ株式会社 | Ti-Ni alloy for medical use |
| JP7490922B2 (en) * | 2018-12-27 | 2024-05-28 | Ｓｂカワスミ株式会社 | Stents |
| CN113197707A (en) * | 2021-06-22 | 2021-08-03 | 上海星伙医疗科技有限公司 | Prostate urethra support with recovery structure |
| CN113967305B (en) * | 2021-12-22 | 2022-06-03 | 德宝恒生科技服务有限公司 | Urination tube |
-
1992
- 1992-08-07 JP JP21178192A patent/JP3214733B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005500890A (en) * | 2001-09-04 | 2005-01-13 | コックス，グラエム | Stent |
| JP2007319516A (en) * | 2006-06-02 | 2007-12-13 | Norikata Taguma | Gastrostomy tube using shape memory alloy and its use method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0654913A (en) | 1994-03-01 |
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