Injector auto purge
First Claim
1. An injector of the type having a motor which advances a plunger drive ram for use with a pre-filled syringe containing an approximate known amount of air, comprising:
- a processor which causes the motor to move; and
, a memory storing a predetermined purge stop point representative of the approximate known amount of air in the pre-filled syringe;
the injector configured to automatically advance the plunger drive ram an amount substantially equal to the predetermined purge stop point representative of the approximate known amount of air contained in the pre-filled syringe.
7 Assignments
0 Petitions
Accused Products
Abstract
An auto purge for an intravenous contrast injector of the type having a motor which advances a plunger drive ram and configured for use with a pre-filled or user-filled syringe containing an approximate known amount of air including a processor which causes the motor to move and a memory storing a predetermined purge stop point representative of the approximate known amount of air in the syringe, the injector configured to automatically advance the plunger drive ram an amount substantially equal to the predetermined purge stop point representative of the approximate known amount of air contained in the syringe.
114 Citations
34 Claims
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1. An injector of the type having a motor which advances a plunger drive ram for use with a pre-filled syringe containing an approximate known amount of air, comprising:
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a processor which causes the motor to move; and
,a memory storing a predetermined purge stop point representative of the approximate known amount of air in the pre-filled syringe;
the injector configured to automatically advance the plunger drive ram an amount substantially equal to the predetermined purge stop point representative of the approximate known amount of air contained in the pre-filled syringe. - View Dependent Claims (2, 3, 4, 5)
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6. An injector of the type having a motor which advances a plunger drive ram for use with a user-filled syringe having a syringe plunger and containing an approximate known amount of air, the injector having a mechanical clearance between the plunger drive ram and the syringe plunger, the injector comprising:
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a processor which causes the motor to move; and
,a memory storing a predetermined purge stop point representative of the approximate known amount of air added by aeration during filling in the user-filled syringe and the mechanical clearance between the plunger drive ram and the syringe plunger;
the injector configured to automatically advance the plunger drive ram an amount substantially equal to the predetermined purge stop point representative of the approximate known amount of air added by aeration during filling in the user-filled syringe and the mechanical clearance between the plunger drive ram and the syringe plunger. - View Dependent Claims (7, 8, 9, 10)
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11. A dual head injector comprising:
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a first head configured to receive a first syringe;
a second head configured to receive a second syringe; and
, Y-tubing coupling the first and second syringe;
the dual head injector configured to automatically purge substantially all of the air from the first and second syringes and the Y tubing. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method of automatically purging air from an injector comprising:
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determining a syringe size and type; and
energizing a motor for the period necessary to move a ram to a predetermined purge stop point based on the syringe size and type. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A method of automatically purging air from an injector comprising:
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monitoring an air detector proximate a syringe;
energizing a motor to move a ram to advance a plunger of the syringe while monitoring the air detector proximate the discharge tip of the syringe; and
stopping the ram when air is no longer detected. - View Dependent Claims (26, 27, 28, 29, 34)
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30. A method automatically purging air from a dual head injector comprising:
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determining first and second syringe sizes and types installed on said injector;
energizing a motor of a first head for the period necessary to move a ram to a predetermined purge stop point based on the first syringe size and type;
energizing a motor of a second head for the period necessary to move a ram to a predetermined purge stop point based on the second syringe size and type. - View Dependent Claims (31, 32, 33)
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Specification