Incentive spirometer

Details Incentive spirometer Incentive spirometer

1976-12-22

1978-06-27

Michell, Robert W.

Surgery

Truss

Perineal

73239, 92 98D, 272 99, A61B 508

Patent

active

040968553

ABSTRACT:
There is disclosed an incentive spirometer for measuring, as desired, the inspiratory breathing capacity and/or the expiratory breathing capacity including a freely floating piston positioned within a chamber. The piston is responsive to an inspired breath inhaled from one end of the chamber and also responsive to an exhaled breath introduced into the other end of the chamber. A novel rolling seal is provided which causes extremely minute friction losses during movement and which effectively seals the area between the external perimeter of the piston and the internal surface of the chamber.

REFERENCES:
patent: 2860017 (1958-11-01), Honegger
patent: 3319420 (1967-05-01), Mercier
patent: 3395699 (1968-08-01), Beasley
patent: 3635214 (1972-01-01), Rand
patent: 3722506 (1973-03-01), McMillan, Jr.
patent: 3754546 (1973-08-01), Cooper
patent: 3848583 (1974-11-01), Parr
patent: 3985124 (1976-10-01), Coleman

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