Combination electrode
First Claim
1. In a combination, ion sensitive and reference electrode:
- an elongated electrically non-conducting tube, one end of which is fitted with a specific ion permeable seal;
first connection means within said tube for making electrochemical connection to the inner side of said seal;
said tube being formed with a depression in its exterior surface;
means for creating a cavity of the space overlying said depression which can be entered from the exterior of the electrode by a needle comprising a pliant member formed of a substance that may be pierced with a needle from the exterior of the electrode, and carried by said tube and overlying said depression such that said depression forms a cavity between said pliant member and said tube and exposed at the exterior of said electrode;
second connection means comprising a metallic electrical conductor terminating in said cavity;
non-metallic means for conducting ions between the exterior of said combination electrode and said cavity; and
a quantity of salt other than a salt of the metal of said metallic electrical conductor in said cavity in physical contact with said second connection means and with said non-metallic means.
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Accused Products
Abstract
An ion selective combination is formed by creating a measuring electrode from an elongated tube whose wall is made with a depression along its length. That wall depression is covered with a material of a kind that can be pierced by the needle of a syringe or otherwise treated so that an electrolyte, or a liquid to form an electrolyte, can be injected into the cavity formed by the depression and that covering material. The electrolyte in the cavity then serves as the electrolyte of a reference cell which is completed by some non-metallic means for conducting ions from the interior of the cavity to the exterior where contact is made with a material to be tested. That ion path can be completed by a salt bridge or by ionic conduction through the pliant or piercable cover over the cavity in which the electrolyte is housed. An electrode having those features is combined with a coaxial cable so that the electrode structure is formed on the end of the cable. Thus arranged, the cable serves as a tool for inserting and retracting the electrode into small openings and through catheters and the like.
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Citations
16 Claims
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1. In a combination, ion sensitive and reference electrode:
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an elongated electrically non-conducting tube, one end of which is fitted with a specific ion permeable seal; first connection means within said tube for making electrochemical connection to the inner side of said seal; said tube being formed with a depression in its exterior surface; means for creating a cavity of the space overlying said depression which can be entered from the exterior of the electrode by a needle comprising a pliant member formed of a substance that may be pierced with a needle from the exterior of the electrode, and carried by said tube and overlying said depression such that said depression forms a cavity between said pliant member and said tube and exposed at the exterior of said electrode; second connection means comprising a metallic electrical conductor terminating in said cavity; non-metallic means for conducting ions between the exterior of said combination electrode and said cavity; and a quantity of salt other than a salt of the metal of said metallic electrical conductor in said cavity in physical contact with said second connection means and with said non-metallic means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a combination, ion sensitive and reference electrode:
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an elongated electrically non-conducting tube, one end of which is fitted with a specific ion permeable seal; first connection means within said tube for making electrochemical connection to the inner side of said seal; said tube being formed with a depression in its exterior surface; means for creating a cavity of the space overlying said depression which can be entered from the exterior of the electrode by a needle comprising a pliant member formed of a substance that may be pierced with a needle from the exterior of the electrode, and carried by said tube and overlying said depression such that said depression forms a cavity between said pliant member and said tube and exposed at the exterior of said electrode; second connection means comprising a metallic electrical conductor terminating in said cavity; non-metallic means for conducting ions between the exterior of said combination electrode and said cavity; a coaxial cable the center conductor of which comprises said first connection means and the outer conductor of which comprises said second connection means, a length of said cable being disposed in the other end of said tube; said second connection means extending from within said tube along said cable to said other end of the tube and then along the exterior of the tube to said depression; - View Dependent Claims (13, 15, 16)
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12. means in the form of a heat shrinkable plastic tube embracing a portion of the length of the tube and the cable extending therefrom for fastening the cable to the tube and retaining said second connection means in place;
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said non-metallic means for conducting ions between the exterior of said electrode to the interior comprising a quantity of salt other than a salt of the metal of said metallic electrical conductor in said cavity in contact with said second connection means and a liquid junction extending from said quantity of salt to the exterior of the electrode. - View Dependent Claims (14)
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Specification