SENSOR WITH CONDUCTOR AND SEALING GLASS
First Claim
1. A probe for use in a patient having a vessel carrying blood to ascertain characteristics of the blood comprising a cannula having proximal and distal extremities, the distal extremity being adapted to be inserted into the vessel of the patient, an electrolyte solution disposed in the cannula, a gas sensor assembly mounted in the distal extremity of the cannula and including an electrode disposed in the electrolyte solution, a conductor extending to the electrode and a sealing glass extending around the conductor, the conductor having a coefficient of thermal expansion and the sealing glass having a coefficient of thermal expansion approximating the coefficient of thermal expansion of the conductor for inhibiting separation of the conductor from the sealing glass and thus inhibiting the electrolyte solution from creeping between the conductor and the sealing glass.
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Accused Products
Abstract
An apparatus for use with a patient having a vessel carrying blood to ascertain characteristics of the blood. The apparatus includes a display module and a probe having a distal extremity adapted to be inserted into the vessel of the patient and having a proximal extremity coupled to the display module. The probe includes a sensor in the distal extremity for providing an electrical signal to the display module when the probe is disposed in the blood. The probe can have an antithrombogenic surface treatment for inhibiting the adhesion of blood components to the probe when disposed in the blood.
105 Citations
21 Claims
- 1. A probe for use in a patient having a vessel carrying blood to ascertain characteristics of the blood comprising a cannula having proximal and distal extremities, the distal extremity being adapted to be inserted into the vessel of the patient, an electrolyte solution disposed in the cannula, a gas sensor assembly mounted in the distal extremity of the cannula and including an electrode disposed in the electrolyte solution, a conductor extending to the electrode and a sealing glass extending around the conductor, the conductor having a coefficient of thermal expansion and the sealing glass having a coefficient of thermal expansion approximating the coefficient of thermal expansion of the conductor for inhibiting separation of the conductor from the sealing glass and thus inhibiting the electrolyte solution from creeping between the conductor and the sealing glass.
- 5. A probe for use in a patient having a vessel carrying blood to ascertain characteristics of the blood comprising a cannula adapted to be inserted into the vessel of the patient and having proximal and distal extremities, an electrolyte solution disposed in the distal extremity of the cannula, a gas sensor assembly mounted in the distal extremity of the cannula and disposed in the electrolyte solution, the gas sensor assembly having a tube with a distal portion and a first electrode coiled around the tube and a second electrode carried by the distal portion of the tube, first and second conductors extending from the proximal extremity of the cannula to the gas sensor assembly, the first conductor being coupled to the first electrode and the second conductor extending through the tube and being coupled to the second electrode whereby the tube serves as support for the first electrode and as a conduit for the second conductor.
- 11. A probe for use in a patient having a vessel carrying blood to ascertain characteristics of the blood comprising a cannula having proximal and distal extremities, the distal extremity being adapted to be inserted into the vessel of the patient, a flex circuit extending through at least a portion of the cannula, the flex circuit having proximal and distal portions with first and second electrodes formed on the distal portion and first and second conductors extending from the proximal portion to the first and second electrodes, an electrolyte solution disposed in the distal extremity of the cannula in the vicinity of the first and second electrodes.
Specification