| 摘要 |
A pneumatic percussor is disclosed herein for therapeutic purposes such as to loosen and mobilize bronchial secretions in humans which provides an applicator having a cylindrical body with a central partition incorporating a movable poppet valve. A front diaphragm is movably carried in the body immediately ahead of the partition so as to define a pressure chamber therebetween. A relief chamber is defined on the opposite side of the partition as established by a second or rear diaphragm which also carries the poppet valve. A hammer is secured to the front diaphragm so as to follow its movement and an application pad is fixed to the hammer. Biasing springs normally maintain the poppet valve closed and the front diaphragm against an impact seal carried on the partition. A compressed gas is introduced into the pressure chamber to move the front diaphragm including the hammer and the pad while build-up of pressure operates the rear diaphragm to open the poppet valve to exhaust the relief chamber to atmosphere whereby the front diaphragm, hammer and pad return stroke to their initial position. Guides coaxially support the pad, hammer and front diaphragm as well as the poppet valve and the second or rear diaphragm.
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