| 摘要 |
A pump for supplying air to a patient is operable either manually, or automatically by a pulsating gaseous pressure supply. The pump comprises a flexible outer membrane 3 which envelops a self-expanding inner membrane 2 to form a chamber 4 therebetween. Pulsating pressure is applied to the chamber 4 thereby to expand and contract the pumping chamber within the inner membrane 2. The inner membrane 2 has inlet and outlet valves 5 and 6. The pump can be operated manually by the application and release of pressure to the outer membrane 3. <IMAGE> |
