Catheter.

[Detailed Description of the Invention]

(Field of the Invention) The present invention relates to the catheter for introducing or collecting the extended holding fixtures for securing the inside diameter of inner Cavity of a tubular organ. (PRIOR ART) For example, when preventing re-Stenosis of the portion after extending the narrowed part of the coronary arteries by a vasodilatation catheter, the extended holding fixture (it is also hereafter called a stent) is used for the purpose of generally securing the inside diameter of inner Cavity of a tubular organ. The Woven thing (Surgery, 1986, 99 No. 2, the 199 - 205th page) or thing (JP,61-6655,B) , of the product made from a tropism shape memory alloy on the other hand is devised reticulated in the stainless steel wire as a stent conventionally used for such an object. When securing vasodilatation, using this stent made from stainless steel, a stent can be introduced into the prescribed position of a blood vessel via a vasodilatation catheter, the balloon subsequently to a catheter tip part provided can be extended, and a stent can be opened to a vessel diameter. On the other hand, in the case of the stent made from a tropism shape memory alloy, similarly it heats with after-introduction warm water etc. to the appointed number place of a blood vessel, and extension of a stent is performed. However, as a stent is only twisted around the surface outside a catheter tip part in any case, in order to make it hold, The outside diameter of this stent volume price portion becomes larger than the other parts of a catheter, As a result, the problem that the slidability of a catheter carries out a To be conspicuous fall by this stent applied part when introducing a catheter in comparatively thin blood vessels, such as the coronary arteries, or when introducing the catheter equipped with this stent in a guide catheter is Oh. In addition, as for the conventional catheter for stent introduction / recovery, problems, such as a means to check the position of a catheter tip part or physical relationship with the detained stent not being established, but being operationally accompanied by difficulty, are also Oh. (Problem which an invention tends to solve) Also in the state where the tip part was equipped with the stent, the slidability of the present invention within a blood vessel or a guide catheter is good, And it aims at providing the catheter for stent introduction / recovery which can check the position of a tip part easily and can improve operativity. (Means for solving a problem) In order that the present invention may solve the above-mentioned problem, the outside diameter of the stent applied part of a catheter tip part is made small, Even when this equipped with a stent, the outside diameter of this portion was kept from becoming larger than other parts, and also a means to provide X-rays an unpenetrated marker in the narrow diameter portion of this stent applied part was adopted if needed. The catheter tube which a end face or both ends will carry out the opening of the present invention, and will drill the side mouth of the end face opening and a large number open for free passage in the peripheral surface near [ the ] the tip if it states concretely, The hub part provided in it as was open for free passage to this catheter tube end face opening, the valve element provided as intercepted the passage of the hub part, and a temperature change -- the extended holding fixture for inside diameter reservation of Cavity in a tubular organ with which it was equipped as consisted of a tube-like object made from a shape memory alloy which may be extended or contracted to an intermediary diameter direction and covered at least one pair of the side mouth drilling parts of the above-mentioned catheter tube, It provides, and the side mouth of above-mentioned a large number distributes to the peripheral surface near the tip of the catheter tube on the average, and is provided in it, The catheter which the outside diameter of the side [ this ] mouth drilling part is formed smaller than the catheter tube outside diameter of other parts, and is characterized by whether the above-mentioned extended holding fixture of that outside diameter is equal to the catheter tube outside diameter of a part besides the above or equipping the above-mentioned side mouth drilling part as it becomes small is provided. The present invention provides the catheter which provided the X-rays unpenetrated marker in at least one copy of the above-mentioned side mouth drilling part in the above-mentioned catheter. The hub part of the above-mentioned catheter is made into the branching hub in which the branching port was established one or more, and it may be made to provide a nonreturn valve in one of ports. In the present invention, a shape memory alloy has transformation temperature and means what changes to the shape it was made to remember beforehand that became more than this temperature, if it can change freely at the time of below transformation temperature, it becomes a tropism shape memory alloy with more than transformation temperature and shape change is carried out on the other hand -- after that -- below transformation temperature -- saying what maintains the shape which the intermediary also memorized The bidirectional shape memory alloy has also memorized the shape below transformation temperature, and means what reveals two shape reversibly bordering on transformation temperature. (EXAMPLE) Hereinafter, this invention is explained with reference to the example of illustration. Catheter tube 11 in which Drawing 1 shows one example of the catheter concerning the present invention, and Then and both ends carried out the opening, Spiral extended holding fixture (stent) 13 formed in hub part 12 provided in it as was open for free passage to the end face opening of this catheter tube 11, and the tip part of this catheter tube 11 is provided. Intermediary To have [ as ] which catheter tube 11 of the applied part of this stent 13 has an outside diameter of stent 13 when narrow diameter portion 11a fabricated smaller than other parts, intermediary Stomach, therefore its peripheral surface are equipped with an outside diameter equal to the other parts of catheter tube 11, or becomes smaller. Many side mouths 14 the end face opening of catheter tube 11 and for stent cooling fluid derivation open for free passage are provided in the peripheral surface of the above-mentioned narrow diameter portion 11a. Drawing 2 shows the state where spiral stent 13 (refer to the 3rd figure) was removed from the thing of Drawing 1, and specifies the drilling state of side mouth 14. Like illustration, the shape of side mouth 14 is a slit-like thing besides a circular thing, and is good. [ of Then ] Tip part 11b of catheter tube 11 has an outside diameter equal to a base, the end makes the shape of a surface of a sphere, and the hole which can insert in a guide wire is drilled in the center. Ring shape marker 15 consisting of X-rays an unpenetrated substance, for example, gold, is provided in the both ends of the above-mentioned narrow diameter portion 11a, respectively. Intermediary To have [ as ] which can pour in various medical fluids without hub part 12 having a pair of branching ports 16a and 16b, and removing cooling fluid and the circuit device for pressure measurement. Intermediary To have [ as ] which can insert in a guide wire etc. nonreturn valve 17 which consists of a flexible material like silicone rubber near [ the ] the opening being provided, and maintaining fluid-tight nature while carrying out the opening of the end face of hub part 12, as shown in Drawing 4. As the quality of the material of catheter tube 11, thermoplastics (for example, ethylene acetic acid vinyl copolymer) is usually preferred. Generally thermoplastics (for example, polycarbonate) is similarly used about hub part 12, and as shown in Drawing 4, it is connected via a base end, adhesives, etc. of catheter tube 11. Example 1 The 2-way shape memory alloy (51 atom % nickel is included with a nickel-Ti system alloy) manufactured by the predetermined method as stent 13 is spirally fabricated, as shown in Drawing 3, This is inserted in the temperature more than 35 degreeC on narrow diameter portion 11a of catheter tube 11 as Keep it and once expanded shape, Subsequently, it cools to the temperature below 20 degreeC using an ice-cooling physiological saline, and stent 13 is contracted and stuck to narrow diameter portion 11a, and it could be equal to the outside diameter of the other parts of catheter tube 11, or was able to make the outside diameter of stent 13 small a little. Subsequently, the ice-cooling physiological saline was made to flow out from side mouth 14 via port 16b, and stent 13 was introduced as [ It was / which maintains the contracted state of stent 13 ] to the detention part which targets the inside of guide catheter 18 beforehand introduced in blood vessel 20 as shown in Drawing 5 using guide wire 19. This Procedure was able to be performed under X ray fluoroscopy, and was able to check the position of stent 13 easily with marker 15 with which narrow diameter portion 11a of catheter tube 11 was equipped. When this detention part was reached, introduction of the ice-cooling physiological saline was stopped, and stent 13 was able to warm gradually by body temperature and Temperature rising(ed) near the body temperature (35degreeC), as shown in Drawing 6, stent 13 was extended, and it was welded by pressure and held at the wall surface in blood vessel 20. Therefore, the tip part of catheter tube 11 was able to be easily drawn out from stent 13 in the state which made stent 13 freely detain in the prescribed position of blood vessel 20. Catheter tube 11 is again introduced after detention of fixed time, and contrast media is poured in into blood vessel 20 via port 16a, When it checks whether the thrombus etc. have adhered to the circumference of stent 13 and adhesion is accepted, after pouring in suitable medical fluids, such as urokinase, and making it dissolve from port 16a, An ice-cooling physiological saline is introduced from port 16b, stent 13 is cooled, and it was able to be made to have been able to change to a contracted state again, and was able to be made to have been able to stick to narrow diameter portion 11a of catheter tube 11, and stents 13 were able to be made to collect from a detention part. Example 2 As 1 directivity shape memory alloy (50 atom % nickel is included with a nickel-Ti system alloy) manufactured by the predetermined method as stent 13 was shown in Drawing 3, it fabricated spirally. This stent 13 could change so that it might stick to narrow diameter portion 11a of catheter tube 11, it was expanded at the time more than 50 degreeC, and made it remember below by 40 degreeC that shape stuck to a predetermined detention part. First, or [ that stick this stent 13 to narrow diameter portion 11a of catheter tube 11 as shown in Drawing 1, and it is equal to the outside diameter of the other parts of catheter tube 11 in the outside diameter of stent 13 ], Or it is made to become smaller and was made to introduce to the object detention part via guide catheter 18 so that it may be shown subsequently to Drawing 5. While pouring in contrast media and checking Stenosis of this part, etc. under fluoroscopy from port 16b here, Each pressure by the side of the base of this part and a tip is measured from port 16a, Grasp the degree of Stenosis certainly, pour in suitable medical fluids, such as urokinase, from port 16b, similarly pour in Warm saline from port 16b after I did it to this detention part, made disposal flow out from side mouth 14, the shape change of the stent 13 was made to change into an expansion state, and it was made to detain in this part. Then, it checks that the pressure by the side of a detention part base and a tip is measured, and there is no pressure slope from port 16a while pouring in contrast media and checking under fluoroscopy from port 16b as a check of stent placement, and they are selection in the living body and Ivy about catheter tube 11. (EFFECT OF THE INVENTION) Because it was made to make a catheter tube tip near part equip with a stent according to the catheter of the present invention as it did not become larger than the outside diameter of the other parts of a catheter tube, The sliding resistance at the time of making a catheter tube introduce in the time of making it introduce in a guide catheter or a blood vessel can carry out To be conspicuous mitigation, therefore it can aim at improvement in operativity. Since the marker which becomes this stent applied part from X-rays an unpenetrated substance was established, physical relationship with the stent which or the catheter detained can be checked easily and clearly. [ tip ] In addition, various effects -- it also becomes possible to pour in various medical fluids -- are produced, without removing the circuit device for cooling fluid or pressure measurement by establishing a branching port in a hub part.

[Brief Description of the Drawings]

In Drawings 2, Drawing 1 is a side view of the catheter concerning the present invention, and a side view showing the state where the stent was removed from the catheter of Drawing 1, The side view and Drawing 6 showing a state when the side view in which Drawing 3 shows an example of a stent, the sectional view which Drawing 4 expands the hub part of a catheter and is shown, and Drawing 5 introduce the catheter of the present invention in a blood vessel are equivalent to Drawing 5, It is a side view showing the state at the time of expanding a stent and making it detain in a blood vessel. The inside of a figure, 11 ...... A catheter tube, 11a ...... A narrow diameter portion, 11b ...... A tip part, 12 ...... A hub part and 13 ...... a stent (extended holding fixture) and 14 ...... a side mouth and 15 ...... a marker, and 16a and 16b ...... a branching port and 17 ...... a nonreturn valve and 18 ...... a guide catheter and 19 ...... a guide wire and 20 ...... a blood vessel.