Bellows type incentive spirometer

Details Bellows type incentive spirometer Bellows type incentive spirometer

1979-03-05

1980-12-30

Cohen, Lee S.

Surgery

Truss

Pad

29454, 73262, 92 42, 272 99, A61B 508, B23P 1102, F16J 304

Patent

active

042417406

ABSTRACT:
A spirometer comprises an upright, hollow frame structure having opposite end portions with an expansible and contractible bellows therein responsive to exhalation and inhalation. The bellows includes a hollow, resilient helical structure with a plurality of coils respectively having relatively broad upper and lower surfaces and relatively thin outer edges. Opposite end members close the helical structure, one of the closing end members being connected to one of the frame structure end portions for suspending the bellows inside the frame structure. A sheet of thin, fluid-impervious film extends the length of the helical structure when the helical structure is expanded and is heat shrunk onto the coils for forming convolutions engaging the upper and lower surfaces and outer edges. The sheath joins the opposite closed end members and defines an impervious outer wall structure for the bellows. A passage is connected to one of the closed end members and communicates with the bellows interior for transmitting inhalation and exhalation pressures thereto.

REFERENCES:
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patent: 642149 (1900-01-01), McKenzie
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patent: 3821950 (1974-07-01), Boehringer
patent: 3849864 (1964-11-01), Plummer
patent: 3951137 (1976-04-01), Conkle et al.

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