| 摘要 |
A chest covering shell (4) of springy material for fitting over a patient's chest is coupled to an air oscillator. Changes in air pressure in the shell (40) cause ventilation of the patient. A back plate (10) can be used which has vertically extending supports (14) for engagement with the sides (28) of the shell (40) so as to support them and prevent their flexing during use. The edge of the shell (4) has a seal (50 which runs continuously around the periphery of the shell (40). The seal (50) can include an inwardly directed flap (56) in order to provide an effective seal when positive pressures are applied under the shell (40). A backing pad (58) comprising an evacuatable envelope containing solid particles can be used which is able to support the shell (40) and seal against the patient. The pad (58) can be deformed by the weight of the patient and can be evacuated via air outlet (70) to stiffen the envelope by compression of the particle.
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