Methods and materials for stabilizing analyte sensors
First Claim
1. A sensor system comprising:
- a sensor having a chemically reactive surface that reacts with an analyte to be sensed; and
a cannula comprising;
a substantially cylindrical housing that surrounds the sensor;
at least one aperture disposed in the housing that allows the analyte to diffuse therethrough so as to contact the chemically reactive surface;
an end that extends beyond an end of the sensor;
an accessory material provided in proximity to the chemically reactive surface, wherein;
the accessory material fills the at least one aperture of the cannula;
the accessory material is disposed in the aperture such that a surface of the accessory material is substantially flush with a surface of the cannula; and
the sensor system is adapted to contact a tissue such that the accessory material is configured to contact and modify a biological response of the tissue.
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Accused Products
Abstract
The disclosure provides a sensor including a sensor having an external surface and a cannula. The cannula comprises a substantially cylindrical wall encircling a lumen, at least one aperture and a distal end. The sensor is positioned within the lumen and the distal end of the cannula extends beyond the sensor. This configuration functions for example to stabilize chemical reactions associated with the sensor by creating a buffer zone between the sensor and the surrounding tissues at the site of implantation. In certain embodiments, the sensor can further comprise an accessory material in proximity to the external surface, wherein the accessory material modifies the biological response of a tissue that is in contact with the sensor. The sensor can also comprise anchors that keeps the sensor in contact with subcutaneous tissue of a subject upon insertion of the sensor into the body of the subject.
93 Citations
22 Claims
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1. A sensor system comprising:
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a sensor having a chemically reactive surface that reacts with an analyte to be sensed; and a cannula comprising; a substantially cylindrical housing that surrounds the sensor; at least one aperture disposed in the housing that allows the analyte to diffuse therethrough so as to contact the chemically reactive surface; an end that extends beyond an end of the sensor; an accessory material provided in proximity to the chemically reactive surface, wherein; the accessory material fills the at least one aperture of the cannula; the accessory material is disposed in the aperture such that a surface of the accessory material is substantially flush with a surface of the cannula; and the sensor system is adapted to contact a tissue such that the accessory material is configured to contact and modify a biological response of the tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of stabilizing an environment for a chemical reaction between an in vivo analyte and an enzyme that reacts with the analyte, the method comprising performing the chemical reaction using an implanted sensor system comprising:
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a sensor having an chemically reactive surface comprising the enzyme; and a cannula comprising; a substantially cylindrical housing that encircles the sensor; at least one aperture disposed in the housing that allows the analyte to diffuse therethrough so as to contact the chemically reactive surface; and an end that extends beyond an end of the sensor, wherein the aperture and the chemically reactive surface of the implanted sensor system form a stabilized chemical reaction environment that is further stabilized by the end of the cannula that extends beyond an end of the sensor, and an accessory material provided in proximity to the chemically reactive surface, wherein; the accessory material fills the at least one aperture of the cannula; the accessory material is disposed in the aperture such that a surface of the accessory material is substantially flush with a surface of the cannula; and the sensor system is adapted to contact a tissue such that the accessory material is configured to contact and modify a biological response of the tissue; so that the environment for the chemical reaction between the in vivo analyte and the enzyme that reacts with the analyte is stabilized. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of delivering a biologically active substance to a subject comprising implanting a sensor system into a tissue of the subject comprising:
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a sensor having chemically reactive surface that reacts with an analyte to be sensed; an accessory material provided in proximity to the chemically reactive surface, a cannula comprising; a substantially cylindrical housing that surrounds the sensor; at least one aperture disposed in the housing that allows the analyte to diffuse therethrough so as to contact the chemically reactive surface, wherein; the accessory material fills the at least one aperture of the cannula; the accessory material is disposed in the aperture such that a surface of the accessory material is substantially flush with a surface of the cannula; and the sensor system is adapted to contact a tissue such that the accessory material is configured to contact and modify a biological response of the tissue; and an end that extends beyond an end of the sensor, wherein the accessory material comprises the biologically active substance. - View Dependent Claims (21, 22)
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Specification