Fetal electrode
First Claim
1. Apparatus for use in measuring continuously the change of pH of a fetus, comprisinga holder made of an insulating material,a first electrode extending from the forward end of said holder and shaped to attach to the fetus during delivery to secure said first electrode thereto, said first electrode consisting of a solid material which, in the presence of hydrogen ions, will form a first half cell,a second electrode secured to said holder and consisting of a material which, in the presence of hydrogen ions, will form a second half cell, said second electrode being spaced on said holder relative to said first electrode so as to respond to maternal pH values,and means responsive to the difference between the voltages produced by said first and second half cells for continuously measuring the changes in pH of the fetus.
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Accused Products
Abstract
Apparatus for use in measuring continuously the change in pH values of a fetus, comprises a holder made of an insulating material, a spiral electrode extending from the forward end of said holder and adapted to engage the fetus during delivery, a maternal electrode supported on said holder rearward of said spiral electrode, said electrodes including a material which forms a half cell in the presence of hydrogen ions, and means responsive to the potential difference across said first and second electrodes for continuously measuring the changes in pH of the fetus.
36 Citations
7 Claims
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1. Apparatus for use in measuring continuously the change of pH of a fetus, comprising
a holder made of an insulating material, a first electrode extending from the forward end of said holder and shaped to attach to the fetus during delivery to secure said first electrode thereto, said first electrode consisting of a solid material which, in the presence of hydrogen ions, will form a first half cell, a second electrode secured to said holder and consisting of a material which, in the presence of hydrogen ions, will form a second half cell, said second electrode being spaced on said holder relative to said first electrode so as to respond to maternal pH values, and means responsive to the difference between the voltages produced by said first and second half cells for continuously measuring the changes in pH of the fetus.
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6. An electrode assembly for use in measuring continuously the change in pH values of a fetus, comprising:
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a holder made of a dielectric material, a first electrode extending from the forward end of said holder, said electrode comprising a stainless steel spiral having coated thereon material which, in the presence of hydrogen ions, will form a first half cell, a second electrode supported on said holder and spaced from said spiral electrode, said second electrode including material which, in the presence of hydrogen ions, will form a second half cell, and wires connected to said first and second electrodes for enabling the measurement of the potential difference between said first and second half cells for continuously measuring the change in pH value of the fetus. - View Dependent Claims (7)
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Specification