Method and apparatus for insertion of a sensor
First Claim
1. An insertion device comprising:
- a guidance structure having an exit port and adapted to provide axial support to a flexible analyte sensor wherein the stiffness of the flexible analyte sensor is about 1.4 to about 22.6 grams-force per millimeter of deflection for an unsupported length of 10 millimeters; and
an injection activation device associated with the guidance structure, said injection activation device having;
a mechanism adapted to apply a high speed motive force to the flexible analyte sensor such that, when the high speed motive force is applied, the flexible analyte sensor moves at least partially through the guidance structure and at least partially passes through the exit port to cause insertion of only the flexible analyte sensor into skin; and
wherein the high speed motive force is such that a velocity of the flexible analyte sensor at a time of insertion is approximately 5 meters per second to approximately 15 meters per second, wherein the guidance structure is configured so that an unsupported length of the flexible analyte sensor is less than a buckling length of the flexible analyte sensor above which the flexible analyte sensor will buckle from application of the high speed motive force, and wherein the buckling length of the flexible analyte sensor is determined by a formula Pcr=π
2*k/(3*L2), wherein Pcr is a value of the high speed motive force applied to the sensor, k is a stiffness of the flexible analyte sensor, and L is the unsupported length of the flexible analyte sensor.
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Accused Products
Abstract
A device and method for delivering a device such as a sensor or fluid transport structure or a fluid transport structure sensor combination into, for example, mammalian skin. Such a device allows a sensor to penetrate mammalian skin without the use of an introducer device such as a needle. A device in accordance with embodiments of the present disclosure includes a housing for attachment to mammalian skin including an exit port for receiving the distal end of a biosensor and an injection activation device including a mechanism for forcing the sensing device from a first position within the housing, through the exit port to a second position, with sufficiently high velocity to partially penetrate the mammalian skin.
40 Citations
18 Claims
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1. An insertion device comprising:
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a guidance structure having an exit port and adapted to provide axial support to a flexible analyte sensor wherein the stiffness of the flexible analyte sensor is about 1.4 to about 22.6 grams-force per millimeter of deflection for an unsupported length of 10 millimeters; and an injection activation device associated with the guidance structure, said injection activation device having; a mechanism adapted to apply a high speed motive force to the flexible analyte sensor such that, when the high speed motive force is applied, the flexible analyte sensor moves at least partially through the guidance structure and at least partially passes through the exit port to cause insertion of only the flexible analyte sensor into skin; and wherein the high speed motive force is such that a velocity of the flexible analyte sensor at a time of insertion is approximately 5 meters per second to approximately 15 meters per second, wherein the guidance structure is configured so that an unsupported length of the flexible analyte sensor is less than a buckling length of the flexible analyte sensor above which the flexible analyte sensor will buckle from application of the high speed motive force, and wherein the buckling length of the flexible analyte sensor is determined by a formula Pcr=π
2*k/(3*L2), wherein Pcr is a value of the high speed motive force applied to the sensor, k is a stiffness of the flexible analyte sensor, and L is the unsupported length of the flexible analyte sensor.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An insertion device comprising:
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a guidance structure adapted to provide axial support to a flexible analyte sensor, the guidance structure having an exit port; an injection activation device associated with the guidance structure, said injection activation device having; a mechanism adapted to apply a high speed motive force to the flexible analyte sensor such that, when the high speed motive force is applied, the flexible analyte sensor moves at least partially through the guidance structure and at least partially passes through the exit port to cause insertion of only the flexible analyte sensor into skin; and a tensioning structure configured to tension a surface of the skin so that a distance from the surface of the skin at an insertion site on the surface of the skin to the exit port is less than the buckling length of the sensor, and wherein the high speed motive force is such that a velocity of the flexible analyte sensor at a time of insertion is approximately 5 meters per second to approximately 15 meters per second, and wherein the guidance structure is configured so that an unsupported length of the flexible analyte sensor is less than a buckling length of the flexible analyte sensor above which the flexible analyte sensor will buckle from application of the high speed motive force. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification