Surgery – Truss – Pad
Patent
1979-09-05
1981-08-04
Michell, Robert W.
Surgery
Truss
Pad
364417, 128646, A61B 502
Patent
active
042816629
ABSTRACT:
A method for diagnosing unilateral internal carotid occlusive disease comprises the application of a vacuum to a patient's left and right eyes and the automatic storage of the negative-pressure magnitudes at which diastolic and systolic pressures of the left and right retinal arteries are attained. Diastolic and systolic percentage differences automatically calculated between the negative-pressure magnitudes stored for the left and right eyes are compared to pre-established standards, whereby unilateral internal carotid occlusive disease may be diagnosed. Calculations are alternatively made using approximate actual retinal-artery pressures automatically calculated according to a predetermined algorithm making corrections for hardening of the arteries owing to increasing age and for differential eye sizes, the age of the patient together with the axial lengths and initial pressures of his eyes being previously stored. Bilateral internal carotid occlusive disease is diagnosable by comparing the calculated actual diastolic and systolic retinal-artery pressures with conventionally measured brachial pressures. A device for controllably applying negative pressure to a patient's eye and automatically calculating pressure differences includes a transducer receiving pressure input from a vacuum generator and transmitting electronic signals to a microprocessor which operates the vacuum generator. The microprocessor is connected to a keyboard for receiving data input, operation-mode instructions and pressure-control signals and to an alpha-numeric display and a bar graph for displaying pressure magnitudes and calculation results.
REFERENCES:
patent: 3467837 (1969-09-01), Vick
patent: 3934462 (1976-01-01), Rende
Bron, A. J. et al., "Tonographic Studies in Carotid Occlusive Disease", Brit. Jrnl. Opthalmology, (1976), vol. 51, pp. 577-595.
Northrop, R. B. et al., "A No-Touch Ocular Pulse Measurement System for the Diagnosis of Carotid Occlusions," IEEE Trans. Biomed. Engrg., vol. BME-24, No. 2, Mar. 1977, pp. 139-148.
Jaworski Francis J.
Michell Robert W.
Ross Karl F.
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