发明名称 |
Valvula de controle de fluxo com memoria viscoelastica para seringas descartaveis |
摘要 |
<p>Solid disks of polyethylene oxide are radiation crosslinked to instill viscoelastic memory. The disks are then pierced with a needle, heated, cooled and the needle removed to form disks containing a flow orifice in each which upon contact with water will revert to solid disks. A disk with a flow orifice made as just described when used as a memory flow control valve in a conventional injection device will produce a syringe with a single-use, auto-destruct capability. When the disk is inserted in a retainer in the flow channel of the injection device, a drug/vaccine can be drawn into the syringe and then expelled for a preselected time less than six minutes before the water in the drug/vaccine causes the flow orifice in the disk to close, the disk then reverting to its solid shape due to its viscoelastic memory.</p> |
申请公布号 |
BR9107212(A) |
申请公布日期 |
1994.04.05 |
申请号 |
BR19919107212 |
申请日期 |
1991.12.12 |
申请人 |
THE JOHNS HOPKINS UNIVERSITY |
发明人 |
JOHN JOSEPH WOZNIAK;MICHAEL CHARLES ROBERTSON |
分类号 |
A61M5/31;A61L31/00;A61M5/315;A61M5/50;B29C61/00;B29C61/06;B29K71/00;C08J7/00;(IPC1-7):B29C61/00 |
主分类号 |
A61M5/31 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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