Method of direct tissue gas tension measurement and apparatus therefor
First Claim
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1. A method of direct tissue gas tension measurement by use of a gas permeable tube implanted in such tissue and by gas polarography comprising the following steps:
- implanting a predetermined length of said tube through said tissue and leaving a pair of exposed ends of such tube;
inserting reference and gas electrodes in respective ends of said tube;
filling said tube with an electrolytic fluid;
waiting for said gas to permeate from said tissue through said tube into said fluid;
and applying a polarographic potential between said gas and reference electrodes and measuring the electrical signal from said gas electrode.
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Abstract
A new method of tissue oxygen tension measurement which is suitable for human use utilizes an implanted Silastic tube which is inserted through four to five cm of subcutaneous tissue leaving the ends exposed. With the tube filled, for example, with a saline solution, reference and oxygen electrodes are inserted at the exposed ends and by the use of a polarographic potential the amount of oxygen which permeates through the tube from the tissue into the saline solution may be measured on a continuous real-time basis.
18 Citations
27 Claims
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1. A method of direct tissue gas tension measurement by use of a gas permeable tube implanted in such tissue and by gas polarography comprising the following steps:
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implanting a predetermined length of said tube through said tissue and leaving a pair of exposed ends of such tube; inserting reference and gas electrodes in respective ends of said tube; filling said tube with an electrolytic fluid; waiting for said gas to permeate from said tissue through said tube into said fluid; and applying a polarographic potential between said gas and reference electrodes and measuring the electrical signal from said gas electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Apparatus for the direct tension measurement by a gas polarography technique by use of a tube in such tissue comprising:
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a gas permeable tube of relatively small diameter suitable for implantation through said tissue leaving both ends exposed said tube being filled with an electrolytic fluid so that gas from the tissue may permeate through the tube into the fluid; a gas electrode and a reference electrode inserted into said tube and into said electrolytic fluid at respective ends of the tube; means for applying a polarographic potential between said gas and said reference electrodes;
means for measuring the resultant electrical signal from said gas electrode. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. Apparatus for directly measuring tissue gas tension in tissue subcutaneously comprising:
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(a) A catheter having an oxygen permeable membrane positionable in subcutaneous tissue for directly measuring tissue gas tension; (b) an electrolyte in said catheter in chemical contact with the oxygen permeable membrane; (c) an electrode sensitive to oxygen in the catheter in electrical contact with said electrolyte; and (d) a reference electrode in the catheter in electrical contact with said electrolyte, so that when said catheter is positioned in subcutaneous tissue the oxygen in said tissue permeates said membrane, and reaches chemical equilibrium with the electrolyte and an electrical signal is developed between said oxygen sensitive electrode and said reference electrode corresponding to the tissue gas tension in the subcutaneous tissue. - View Dependent Claims (26, 27)
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Specification