JPH03168158A - Guide wire for preventing restenosis after percutaneous coronary artery-plasty - Google Patents

Abstract

PURPOSE:To prevent the restenosis of the coronary arteries by inserting a specific guide wire preventing the restenosis after percutaneous coronary artery- plasty from a catheter for percutaneous coronary artery-plasty. CONSTITUTION:After the constriction part of the coronary arteries is dilated, a catheter for percutaneous coronary artery-plasty is left as it is and a general guide wire is pulled out while a guide wire preventing the restenosis after percutaneous coronary artery-plasty is inserted. This guide wire preventing the restenosis after percutaneous coronary artery-plasty is prepared from a shape memory substance deforming a straight wire to a coil wire in the vicinity of 37 deg.C and, when the guide wire issues from the leading end hole of the catheter for percutaneous coronary artery-plasty, it becomes a coil shape along the inside of a blood vessel wall. The guide wire preventing the restenosis after percutaneous coronary artery-plasty is pushed from the rear by the general guide wire to be stayed in the constriction part of the coronary arteries and the restenosis of a lesion part is prevented.

Description

[Detailed Description of the Invention] "Industrial Applications" This invention is applicable to percutaneous coronary angioplasty in medical treatment.
P T C A; Percutaneousτr
ansluminal Coronary Angiop
It is related to lastyl.

``Prior Art'' The constricted portion of the coronary artery was dilated using the Cong Song Shupei coronary angioplasty (PTcAI: PTcA catheter). However, after several months, the affected area often changes and the proximal artery or stenosis occurs again, resulting in repeated re-institutional surgery, which leaves both the patient and the doctor in shock! Between i'/7 and lIr will be spent, resulting in an increase in medical expenses. or. ui
In the case of stenosis, it is often grade -A and if the lesion is occluded, even the guide wire cannot pass through the lesion, and percutaneous coronary angioplasty (P'I''CA) must be abandoned, and the patient is forced to leave the patient's bed. Depending on the risk of Coronary angioplasty F+ (1)
'r' C A) Restenosis may occur in any case where it is contraindicated, such as in cases where the stenosis is long or where the stenosis is in two or three branches and there is a high possibility of restenosis occurring. is the problem.

“Problem to be solved by the invention” Percutaneous coronary angioplasty
Even if the narrowed part of the arterial artery dilates once, the diseased part may restenose several months later, and in such cases, percutaneous coronary angioplasty (PI'CA) must be performed again. To solve this problem, percutaneous coronary angioplasty (
P T C A 1 14, the solution is to prevent the diseased part of the coronary artery from restenosis.

“A Thousand Steps to Solving Problems” Percutaneous Coronary Angioplasty (PTCA) ILK,
To prevent restenosis of the diseased part of the coronary artery, percutaneous coronary artery grafting (1"I' C A ) σ) q1 at the end,
Transrecurrent angioplasty catheter (P 'I' C
The guide wire used to prevent restenosis after erythrodermal proximal angioplasty is applied to the inner side of the blood vessel wall, deforming it into a coil shape and applying force that tends to cause restenosis. However, the coiled wire can maintain the dilated size of the blood vessel without collapsing, thereby preventing restenosis of the coronary artery.

The guide wire that prevents restenosis during percutaneous coronary angioplasty is made of a shape memory material so that the straight wire deforms into a curved shape when it reaches body temperature, i.e. around 37 degrees Celsius.

1 Sakugawa 11- Prevents restenosis after coronary angioplasty, but does Idowire have a shape memory that transforms from a straight wire into a coiled shape when the body temperature reaches around 37℃? Buy V and f'+
When it exits from the distal foramen of the dermatophilic heptiform artery formation site, it begins to form an r-shape along the inner wall of the blood vessel wall. Figure 8 and ! The expanded size of the canal can be maintained without collapsing, and restenosis of the coronary artery can be prevented.

``Example'' The following is an example of a guidewire that prevents restenosis after percutaneous coronary angioplasty in P'r'Cal.

A general guidewire, which serves as a guide for advancing the Percutaneous Coronary Angioplasty catheter (PT' C8 catheter) into the narrowed part of the coronary artery (Figure 2), is passed through it (Figure 3).
Figure) Advance the percutaneous coronary artery shape F & required force Tedel C P 'I' C A force Tedel) along it and when it reaches the lesioned area (4th country) Inflate the balloon of the PTCA catheter (
Figure 5) The narrowed portion of the coronary artery has now been widened and percutaneous coronary angioplasty (PrCA) has been completed (Figure 6)
However, there is a possibility that the lesion area will change within a few months and the coronary artery will narrow again, and if this happens, percutaneous coronary artery grafting surgery (P'l'C) will have to be performed again. I gave up.

To prevent this, the narrowed part of the coronary artery is dilated,
The catheter for percutaneous coronary angioplasty (PTCA) is left in place (Figure 7), and the general guidewire is removed and a guidewire to prevent restenosis after percutaneous coronary angioplasty is inserted. This guidewire (Fig. 1), which prevents restenosis during percutaneous coronary angioplasty, has the same dimensions as a general guidewire for percutaneous coronary angioplasty, and is resistant to heat at body temperature, around 37°C. It is made of a shape memory material that transforms from a straight wire into a coiled shape, and is used as a percutaneous coronary catheter.
When it exits from the distal pore of the Pi' CA force, it coils along the inside of the blood vessel wall.

No. 8〉This guide wire to prevent restenosis after percutaneous coronary angioplasty is pushed with a general guide wire from behind and placed in the narrowed part of the coronary artery to prevent restenosis in the lesioned part. (Fig. 9) ``Effects of the Invention'' +1 stenosis in the posterior region of the coronary artery is prevented by 11: However, by placing the Idwire in the stenosed part of the coronary artery, the force that tends to stenose the diseased part is reduced. Even if added, the coiled wire will collapse '1! It can maintain the size of the dilated blood vessel without causing restenosis of the coronary artery. i+# Once the stenosis is resolved, there will be no need for repeated in-hospital surgery. In addition, the number of cases in which A-C high bath surgery is performed is reduced, and the contraindications for percutaneous transcutaneous angioplasty (PTCA) are reduced.
This will lead to lower medical costs and fewer sudden deaths due to ischemic heart disease in patients.

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[Brief explanation of the drawing]

Figure 1 shows Neuer's Guide to Preventing Restenosis after Percutaneous Coronary Angioplasty, Figure 2 shows Reputation III.
I+ pulse stenosis, Figure 3 shows the insertion of a general guide wire, and Figure 4 shows the percutaneous coronary angioplasty catheter (P 1
Figure 5 is a view of the percutaneous coronary angioplasty catheter (P'I' CA catheter) with the haroon expanded, Figure 6 is a view of the stenotic part of the coronary artery expanded, Figure 7 shows percutaneous coronary angioplasty. +)i' C8 catheter] is left in place, and Figure 8 shows the percutaneous coronary angioplasty catheter (PTC).
A guide wire to prevent restenosis after percutaneous coronary angioplasty has come out from the tip hole of the A catheter. Figure 9 shows a guide for visiting 14 stenoses after percutaneous coronary angioplasty. Diagram showing the wire placed in the narrowed part of the return artery.

Claims (1)

[Claims] "1" The guide wire for preventing restenosis after percutaneous coronary angioplasty (Fig. 1) has the same dimensions as a guide wire for general percutaneous coronary angioplasty. Body temperature is 37
It is made of a shape memory material that transforms from a straight wire into a coil shape when the temperature is around ℃, and when it exits the tip hole of a percutaneous coronary angioplasty catheter (PTCA catheter), it coils along the inside of the blood vessel wall. A product that becomes (Figures 8 and 9)