Transcutaneous carbon dioxide measurement electrode assembly
First Claim
1. In a transcutaneous carbon dioxide measurement electrode assembly having a central tubular glass electrode having a bottom end, said electrode being composed of a highly insulating material, at said bottom end is positioned a pH responsive glass membrane, said glass membrane having an outer surface for contacting the skin and an inner surface exposed to the interior of the tubular glass electrode, a reference electrode surrounding said glass electrode, a membrane holder, carbon dioxide-permeable polymer membrane bonded to said membrane holder and which is positioned at said bottom end, a skin-heating member which provides a body contacting surface and an aperture through which the CO2 gas being measured is carried to said glass electrode via said membrane and further includes a heater for heating the body contacting surface and provided with a heat sensitive element controlling said heater to maintain said body at a designated temperature, said heating member supporting the membrane holder in a space between said reference electrode and said skin heater so as to form between the CO2 -permeable membrane and the outer surface of said glass membrane an electrolyte chamber for an electrolyte solution which contacts the reference electrode, the improvement comprising a conductive layer formed on the inner surface of said glass membrane, a preamplifier disposed within said glass electrode, a short lead wire connected between said conductive layer and the input terminal of said preamplifier, the output terminal of said preamplifier adapted to be connected to an external low output impedance, measuring device, said glass electrode being filled with an insulating solid material.
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Accused Products
Abstract
A transcutaneous gas measuring assembly is described in which a glass electrode is formed by a body of highly insulating material and a bottom by a glass membrane. The membrane is provided with a conductive layer on the inner surface thereof and a preamplifier is disposed within the glass electrode and electrically connected to the conductive layer. A reference electrode is disposed around the glass electrode. All of the above form a measuring portion of the gas measuring assembly.
9 Citations
1 Claim
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1. In a transcutaneous carbon dioxide measurement electrode assembly having a central tubular glass electrode having a bottom end, said electrode being composed of a highly insulating material, at said bottom end is positioned a pH responsive glass membrane, said glass membrane having an outer surface for contacting the skin and an inner surface exposed to the interior of the tubular glass electrode, a reference electrode surrounding said glass electrode, a membrane holder, carbon dioxide-permeable polymer membrane bonded to said membrane holder and which is positioned at said bottom end, a skin-heating member which provides a body contacting surface and an aperture through which the CO2 gas being measured is carried to said glass electrode via said membrane and further includes a heater for heating the body contacting surface and provided with a heat sensitive element controlling said heater to maintain said body at a designated temperature, said heating member supporting the membrane holder in a space between said reference electrode and said skin heater so as to form between the CO2 -permeable membrane and the outer surface of said glass membrane an electrolyte chamber for an electrolyte solution which contacts the reference electrode, the improvement comprising a conductive layer formed on the inner surface of said glass membrane, a preamplifier disposed within said glass electrode, a short lead wire connected between said conductive layer and the input terminal of said preamplifier, the output terminal of said preamplifier adapted to be connected to an external low output impedance, measuring device, said glass electrode being filled with an insulating solid material.
Specification
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- Resources
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Current AssigneeSumitomo Electric Industries Limited (Sumitomo Corporation)
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Original AssigneeSumitomo Electric Industries Limited (Sumitomo Corporation)
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InventorsOhkawa, Shinichi, Hiramoto, Junichi, Fukai, Tamotsu
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Primary Examiner(s)Cohen, Lee S.
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Application NumberUS06/258,628Time in Patent Office1,168 DaysField of Search128/635, 204/195 B, 204/195 P, 204/195 G, 204/195 M, 204/403, 204/420, 204/433US Class Current600/354CPC Class CodesA61B 5/14542 for measuring blood gases A...A61B 5/1477 non-invasiveA61B 5/1491 Heated applicators
