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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0448691 (1989-12-11) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 454 인용 특허 : 0 |
Intra-arterial stents are frequently used subsequent to balloon angioplasty to maintain arterial patency. The most frequent cause for failure to maintain patency is the rapid growth of the injured arterial tissue through the openings in the stent, which rapid growth is called “intimal hyperplasia.”S
Intra-arterial stents are frequently used subsequent to balloon angioplasty to maintain arterial patency. The most frequent cause for failure to maintain patency is the rapid growth of the injured arterial tissue through the openings in the stent, which rapid growth is called “intimal hyperplasia.”Since irradiation from a radioisotope source is capable of selectively inhibiting the growth of hyperproliferating cells as compared with normal cells, a radioisotope material which forms part of the stent can be used to decrease the rate of arterial reclosure. The radioisotope could be placed inside the stent, alloyed into the metal from which the stent is made, or preferably, it can be coated onto the stent\s exterior surface. Beta emitting radioisotopes having a half-life between 1 and 100 days would be best suited as a stent coating because of their comparatively short range of action within human tissue, and because of their comparatively short half-life. An anti-thrombogenic coating placed on the outer surface of the radioisotope stent would further reduce arterial reclosure by decreasing stent thrombogenicity.
An intra-arterial stent comprising a generally tubular structure whose external surface is adapted to engage the arterial wall and which is patent throughout its entire interior length, said stent being formed from a radioactive material which is outwardly, radially expandable after percutaneous ins
An intra-arterial stent comprising a generally tubular structure whose external surface is adapted to engage the arterial wall and which is patent throughout its entire interior length, said stent being formed from a radioactive material which is outwardly, radially expandable after percutaneous insertion into an artery, the radioactive material being adapted to be imbedded into the plaque so that the radioactive material preferentially emits radiation that can reduce the proliferation of cells in the arterial wall that are in close proximity to said stent.
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