发明授权
- 专利标题： Ampule for needleless injection
- 专利标题（中）： 安瓿无针注射
-
申请号： US239884申请日： 1994-05-09
-
公开(公告)号： US5503627A公开(公告)日： 1996-04-02
- 发明人: Charles M. McKinnon , Takaaki Nakagawa , Carl E. Wilcox
- 申请人： Charles M. McKinnon , Takaaki Nakagawa , Carl E. Wilcox
- 申请人地址： OR Portland
- 专利权人： Bioject, Inc.
- 当前专利权人： Bioject, Inc.
- 当前专利权人地址： OR Portland
- 主分类号： A61M5/20
- IPC分类号： A61M5/20 ; A61M5/30 ; A61M5/307 ; A61M5/31 ; A61M5/48
摘要：
A needleless injection device has a housing containing a pilot valve connectable to a compressed gas source. A two stage power amplifying valve includes a main valve operatively connected to the pilot valve. The pilot valve and main valve form a two-stage valve with the pilot valve activatable to open the main valve utilizing gas pressure. Compressed gas in a reservoir flows through the open main valve to drive a plunger into an ampule to inject an injectant through a patient's skin. Interlocks are provided to resist inadvertent actuation of the device and a indicator indicates whether there is sufficient gas pressure in the device for another injection.