System for continuous withdrawal of blood

Details System for continuous withdrawal of blood System for continuous withdrawal of blood

1975-06-17

1977-02-08

Medbery, Aldrich F.

Surgery

Respiratory method or device

Ozone or ion generation

128214B, 128DIG1, 128218A, 1282144, 128 2F, 3 1, A61B 500, A61M 100

Patent

active

040067432

ABSTRACT:
A small, portable, constant withdrawal device is connected to tubing, including a catheter, whose internal walls are coated with heparin. The catheter is inserted intravenously through a disposable needle into a subject such as a human being. The subject may then move about for a selected period when blood is being slowly withdrawn at a prescribed rate and collected in a container within a housing supporting the device. The collected blood may then be analyzed to permit the measurement of the integrated concentration of growth hormone or any substance whose concentration in blood fluctuates widely.
In addition, a portable microdiffusion chamber is incorporated between the indwelling catheter and the extra corporal tubing and is electrically connected through a sensing probe to an associated portable sensory responsive device. This permits analyzation of the extracted blood to determine the in vivo concentration of circulating concentrations of the diffusable fraction of biological materials in the blood.

REFERENCES:
patent: 2183318 (1939-12-01), Burton
patent: 3496878 (1970-02-01), Hargest
patent: 3579441 (1971-05-01), Brown
patent: 3582234 (1971-06-01), Isreeli
patent: 3701350 (1972-10-01), Guenther
patent: 3826678 (1974-07-01), Hoffman et al.

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