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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0713770 (1991-06-12) |
| 발명자 / 주소 |
|
| 인용정보 | 피인용 횟수 : 538 인용 특허 : 0 |
Disclosed is a coil stent constructed from a nitinol alloy having the ends thereof shaped to interact with a placement device specifically designed to hold the stent in a reduced diameter while it is being maniuplated to its desired position in the patient\s body. The placement device is a hollow tu
Disclosed is a coil stent constructed from a nitinol alloy having the ends thereof shaped to interact with a placement device specifically designed to hold the stent in a reduced diameter while it is being maniuplated to its desired position in the patient\s body. The placement device is a hollow tube which has holes in it surface allowing placement of the ends of the stent therethrough so that they can be held in place inside the interior of the placement device by a mandril which is threaded through the center of the placement device. The combination of the features of the shapes on the end of the stent, the holes in the placement device and the mandril which passes through the placement device and the shapes on the end of the stent allow the interventional radiologist to accurately and rapidly place the stent in its desired position before it changes shape to its final pre-set configuration.
A method of placing an internal support into a hollow structure utilizing a tubular placement device, the tubular placement device having a central lumen extending along its length comprising: forming a fixed length wire of a shape memory alloy into a first shape sized to fit within and support the
A method of placing an internal support into a hollow structure utilizing a tubular placement device, the tubular placement device having a central lumen extending along its length comprising: forming a fixed length wire of a shape memory alloy into a first shape sized to fit within and support the hollow structure, said wire having first and second retention means on the ends thereof, cooling the wire to a temperature below the transition temperature range of the shape memory alloy, placing the first retention means through a first opening in the wall of the tubular placement device, securing the first retention means within the lumen of the tubular placement device by advancing an end of a mandril along a portion of the length of the lumen and through the first retention means, wrapping the wire around the outer surface of the tubular placement device and placing the second retention means through a second opening in the wall of the tubular placement device into the lumen, securing the second retention means in the lumen by advancing the end of the mandril further along the length of the tubular placement device through the second retention means and past the second opening, advancing the tubular placement device with the wire wound on its outer surface into the hollow structure until the first retention means is at a desired location in the hollow structure, releasing the second retention means by withdrawing the end of the mandril to a point between the first and second opening in the wall, allowing the wire to at least partially reform to its first shape an amount sufficient to retain the wire within the hollow structure, said reformation being caused by exposing the wire to a temperature greater than the transition temperature range of the alloy, releasing the first retention means by withdrawing the end of the mandril past the first opening, and withdrawing the tubular placement device and mandril from the hollow structure.
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