Ambulatory infusion devices and associated methods
First Claim
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1. A method of operating an infusion device, comprising the steps of:
- actuating a fluid transfer device, which is configured to deliver a predetermined volume during each actuation, in accordance with a delivery profile that includes a plurality of fluid transfer device actuations;
determining whether an actual volume delivered during a fluid transfer device actuation is the predetermined volume by sensing pressure, at a single location with a single pressure sensor that is located upstream of a flow restrictor and that has a compliant diaphragm, a compliance value and a sensor apparatus located in spaced relation to the compliant diaphragm, and determining the magnitude of the of a pressure spike associated with the fluid transfer device actuation and multiplying the magnitude of the pressure spike by the compliance value; and
adjusting the number of actuations in the delivery profile in response to the actual volume delivered differing from the predetermined volume.
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Abstract
A method of operating an infusion device that includes the steps of actuating a fluid transfer device, which is configured to deliver a predetermined volume during each actuation, in accordance with a delivery profile that includes a plurality of fluid transfer device actuations, determining, based on sensed pressure, whether an actual volume delivered during a fluid transfer device actuation is the predetermined volume, and adjusting the number of actuations in the delivery profile in response to the actual volume delivered differing from the predetermined volume.
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Citations
17 Claims
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1. A method of operating an infusion device, comprising the steps of:
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actuating a fluid transfer device, which is configured to deliver a predetermined volume during each actuation, in accordance with a delivery profile that includes a plurality of fluid transfer device actuations; determining whether an actual volume delivered during a fluid transfer device actuation is the predetermined volume by sensing pressure, at a single location with a single pressure sensor that is located upstream of a flow restrictor and that has a compliant diaphragm, a compliance value and a sensor apparatus located in spaced relation to the compliant diaphragm, and determining the magnitude of the of a pressure spike associated with the fluid transfer device actuation and multiplying the magnitude of the pressure spike by the compliance value; and adjusting the number of actuations in the delivery profile in response to the actual volume delivered differing from the predetermined volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An ambulatory infusion device, comprising:
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an outlet port; a fluid transfer device configured to deliver a predetermined volume during each actuation thereof; a fluid path that operably connects the fluid transfer device to the outlet port; a pressure sensor associated with the fluid path; a flow restrictor between the pressure sensor and the outlet port; and means for actuating the fluid transfer device in accordance with a delivery profile that includes a plurality of fluid transfer device actuations, determining based on pressure sensed only upstream of the flow restrictor whether an actual volume delivered during a fluid transfer device actuation is the predetermined volume, and adjusting the number of actuations in the delivery profile in response to the actual volume delivered differing from the predetermined volume. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification