Title:
【発明の名称】特に医薬注入装置のための逆止弁
Document Type and Number:
Japanese Patent JP3133757
Kind Code:
B2
Abstract:
PCT No. PCT/DE91/00896 Sec. 371 Date Aug. 7, 1992 Sec. 102(e) Date Aug. 7, 1992 PCT Filed Nov. 16, 1991 PCT Pub. No. WO92/10232 PCT Pub. Date Jun. 25, 1992.A nonreturn valve has a housing (1) provided with a central chamber (9) into which open an inlet channel (6) and an outlet channel (7) that may be separated by a sealing membrane (10) provided with a flow passage (18). The membrane (10) has a marginal part (16a) clamped in the housing (1), a central sealing part (16b) and a thinner annular wall (17) that links both parts (16a,16b). In order to obtain a nonreturn valve that has a reliable operation even at the smallest differential pressures, a central crater-like sealing formation (13,14), for example, is provided in the membrane (10). The inflow from the inlet channel (6) to the membrane (10) takes place outside the crater-like sealing structure (13,14) and the flow passage (18) of the membrane (10) is located within the crater-like sealing structure (13,14). The thinner annular wall (17) of the membrane (10), that generates a sealing pre-stress, has a shaped cross-section and its open junctures (17a,17b) adjacent to the marginal part and to the central sealing part (16b) of the membrane (10) are located at least approximately in the same plane, that coincides with the sealing plane, or is parallel thereto.
Inventors:
Forberg, Hans-Jürgen
Application Number:
JP50001192A
Publication Date:
February 13, 2001
Filing Date:
November 16, 1991
Export Citation:
Assignee:
Forberg, Hans-Jürgen
International Classes:
A61M5/168; A61M39/00; A61M39/24; A61M5/00; F16K15/14; (IPC1-7): A61M5/00; A61M5/168; A61M39/00
Domestic Patent References:
| JP604680A |
Other References:
【文献】西独国特許出願公開2603712(DE,A1)
【文献】仏国特許出願公開2142846(FR,A1)
【文献】米国特許3270771(US,A)
【文献】仏国特許出願公開2142846(FR,A1)
【文献】米国特許3270771(US,A)
Attorney, Agent or Firm:
Haruo Hamada