Reference electrode catheter
First Claim
1. A reference electrode catheter for use in potentiometric electroanalysis in body fluids comprising:
- an elongated cylindrical tubing having proximal and distal ends and having a passageway extending throughout the entire length thereof;
a hollow cylindrical housing member being mounted at the distal end of said tubing and having enclosed ends to thereby form a sealed chamber within said housing member, an aperture extending through a wall of said housing member and communicating with said chamber;
an electrode positioned within said chamber;
a conductive lead connected to said electrode and extending out of the housing member and through said passageway of said tubing to the proximal end of said tubing;
retainer means positioned within said housing member for supporting said electrode;
electrolytic material disposed within the chamber of the cylindrical housing member and in contact with said electrode; and
,a biocompatible porous liquid junction comprised of a hydrogel being positioned across said aperture in said housing member so as to form an ion diffusion control barrier between body fluids and the electrolytic material within the chamber in said housing member for providing a stable liquid junction potential in body fluids to provide a substantially voltage stable reference electrode.
3 Assignments
0 Petitions
Accused Products
Abstract
A reference electrode catheter for use for in vivo measurement of body fluids. The catheter includes a small diameter cylindrical tube having a reference electrode assembly disposed on the distal end thereof. The reference electrode assembly includes a hollow cylindrical housing and an electrode element positioned within the housing mounted on and supported by a retainer member. The electrode element is connected to an electrical conductor which extends out of the housing and through the passageway of the tubing to the proximal end of the tubing. An electrolytic material, such as gelled Ringer'"'"'s solution, is disposed within the housing, and a membrane formed of hydrogel is positioned across an aperture in the housing so as to form an ion diffusion barrier between the body fluids to be measured and the electrolytic material within the housing.
149 Citations
18 Claims
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1. A reference electrode catheter for use in potentiometric electroanalysis in body fluids comprising:
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an elongated cylindrical tubing having proximal and distal ends and having a passageway extending throughout the entire length thereof; a hollow cylindrical housing member being mounted at the distal end of said tubing and having enclosed ends to thereby form a sealed chamber within said housing member, an aperture extending through a wall of said housing member and communicating with said chamber; an electrode positioned within said chamber; a conductive lead connected to said electrode and extending out of the housing member and through said passageway of said tubing to the proximal end of said tubing; retainer means positioned within said housing member for supporting said electrode; electrolytic material disposed within the chamber of the cylindrical housing member and in contact with said electrode; and
,a biocompatible porous liquid junction comprised of a hydrogel being positioned across said aperture in said housing member so as to form an ion diffusion control barrier between body fluids and the electrolytic material within the chamber in said housing member for providing a stable liquid junction potential in body fluids to provide a substantially voltage stable reference electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A reference electrode assembly for potentiometric electroanalysis in body fluids comprising:
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a hollow cylindrical housing member having enclosed ends to thereby form a sealed chamber within said housing member, an aperture extending through a wall of said housing member and communicating with said chamber; an electrode positioned within the chamber; a conductive lead connected to the electrode and extending out of the housing member; retainer means positioned within said housing member for supporting said electrode; electrolytic material disposed within the chamber of the cylindrical housing member and in contact with said electrode; and a biocompatible porous liquid junction comprised of a hydrogel being positioned across said aperture in said housing member so as to form an ion diffusion control barrier between body fluids to be measured and the electrolytic material within the chamber in said housing member for providing a stable liquid junction potential in body fluids to provide a substantially voltage stable reference electrode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification