METHOD AND SYSTEMS FOR BUFFERING ANESTHETIC CARTRIDGES WITH BUFFERING SOLUTIONS
First Claim
1. A method for buffering an anesthetic in a cartridge having a septum at one end and a plunger at the other end, said method comprising:
- determining a volume of buffer needed to adjust the pH of a volume of the anesthetic to a target value;
providing an anesthetic cartridge containing the volume of anesthetic wherein the plunger is set back from an end of the cartridge by a distance sufficient to allow the cartridge to receive the volume of buffer without displacing the plunger beyond the end of the cartridge; and
introducing the volume of buffer into the cartridge.
3 Assignments
0 Petitions
Accused Products
Abstract
An anesthetic cartridge is adapted to receive a volume of buffer by displacing a plunger in one end of the anesthetic cartridge inwardly so that addition of the buffer volume will not displace the plunger excessively beyond the end of the cartridge body. By properly determining the amount of buffer volume required to raise the pH of the anesthetic to a target value, the degree of inward displacement of the plunger can be determined and the cartridge can be used with a system for delivering a precise amount of buffer solution having a known pH into the cartridge to raise its pH, just before the anesthetic is delivered to the patient.
13 Citations
17 Claims
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1. A method for buffering an anesthetic in a cartridge having a septum at one end and a plunger at the other end, said method comprising:
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determining a volume of buffer needed to adjust the pH of a volume of the anesthetic to a target value; providing an anesthetic cartridge containing the volume of anesthetic wherein the plunger is set back from an end of the cartridge by a distance sufficient to allow the cartridge to receive the volume of buffer without displacing the plunger beyond the end of the cartridge; and introducing the volume of buffer into the cartridge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16)
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14. A system for preparing a buffered anesthetic, said system comprising:
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an anesthetic cartridge having a septum at one end and a plunger at the other end, wherein said cartridge is filled with a volume of anesthetic; and a buffer container holding a volume of buffer selected to raise the pH of the anesthetic to a target pH; wherein the buffer container is adapted to transfer the buffer volume to the anesthetic cartridge and wherein the plunger is set back from an end of the anesthetic cartridge by a distance sufficient to allow the cartridge to receive the buffer volume without displacing the plunger beyond the end of the cartridge.
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17. An inventory of anesthetic cartridges comprising:
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a plurality of identical containers each having a plunger at one end, a septum at other end, and being partially filled with an anesthetic solution; wherein the plunger in each container is spaced away from the plunger end of the cartridge by a distance of at least 10% of the container length.
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Specification