Methods for capacitance volume correction in fluid delivery systems
First Claim
1. A method of capacitance volume correction in a fluid delivery system comprising a fluid-delivery expandable body comprising:
- pressurizing the expandable body by reducing a volume in the expandable body with movement of a pressurizing element;
determining an over-travel distance for the pressurizing element; and
ceasing pressurization by stopping movement of the pressurizing element after allowing the pressurizing element to over-travel the over-travel distance to compensate for expansion of the expandable body under pressure.
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Accused Products
Abstract
Methods for capacitance volume correction in fluid-containing expandable bodies and associated fluid pathways are disclosed. The methods may be applied in fluid delivery systems used to supply fluids to patients during radiographic imaging procedures, including angiography. The methods control delivery of fluid to a downstream process, including providing a fluid-delivery expandable body and a pressurizing element in fluid communication with the downstream process, pressurizing the expandable body by moving the pressurizing element in the expandable body to reduce volume therein, determining an over-travel distance for the pressurizing element, and ceasing movement of the pressurizing element after allowing the pressurizing element to over-travel the over-travel distance to compensate for expansion of the expandable body under pressure. The expandable body may be a syringe and the pressurizing element may be a plunger disposed within the syringe. Movement of the pressurizing element may be controlled by an algorithm associated with a computer.
37 Citations
20 Claims
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1. A method of capacitance volume correction in a fluid delivery system comprising a fluid-delivery expandable body comprising:
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pressurizing the expandable body by reducing a volume in the expandable body with movement of a pressurizing element; determining an over-travel distance for the pressurizing element; and ceasing pressurization by stopping movement of the pressurizing element after allowing the pressurizing element to over-travel the over-travel distance to compensate for expansion of the expandable body under pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of capacitance volume correction in a syringe comprising a plunger and filled with an injection fluid comprising:
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pressurizing the syringe by reducing a volume in a syringe body with movement of the plunger; determining an over-travel distance for the plunger; and stopping movement of the plunger after allowing the plunger to over-travel the over-travel distance to compensate for expansion of the syringe body under pressure. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of controlling delivery of fluid to a downstream process comprising:
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providing a fluid-containing expandable body in fluid communication with the downstream process, the expandable body comprising a pressurizing element; pressurizing the expandable body by moving the pressurizing element forward in the expandable body to reduce a volume therein; determining an over-travel distance for the pressurizing element; and ceasing movement of the pressurizing element after allowing the pressurizing element to over-travel the over-travel distance to compensate for expansion of the expandable body under pressure. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification