METHODS FOR BUFFERING MEDICAL SOLUTIONS
First Claim
1. A method for buffering the pH of a known volume of a medical solution in a container, said method comprising:
- providing sodium bicarbonate buffer in a container, wherein the pH of the buffer is accurately known within ±
0.2 pH unit; and
combining a selected volume of the buffer from the container with the known volume of the medical solution in the container;
wherein the volume of buffer is selected based on the known volume of the medical solution and on the known pH of the buffer and a target pH of the buffered solution so that the actual pH of the buffered solution is with ±
0.2 pH unit of the target.
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Accused Products
Abstract
A device for delivering buffer solution into a buffer cartridge comprises a needle assembly and a pusher. The septa of a buffer cartridge and an anesthetic cartridge are advanced onto a transfer needle, and the pusher advances a plunger into the buffer cartridge to deliver buffer through the transfer needle into the anesthetic cartridge. A separate exhaust needle allows excess anesthetic from the anesthetic cartridge to be exhausted. A compression member is usually provided to maintain a force against the plunger on the buffer cartridge to pressurize and stabilize the contents during sterilization and/or storage. By delivering a buffer with a precisely controlled pH, accurate buffering of the anesthetic can be achieved.
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Citations
18 Claims
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1. A method for buffering the pH of a known volume of a medical solution in a container, said method comprising:
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providing sodium bicarbonate buffer in a container, wherein the pH of the buffer is accurately known within ±
0.2 pH unit; andcombining a selected volume of the buffer from the container with the known volume of the medical solution in the container; wherein the volume of buffer is selected based on the known volume of the medical solution and on the known pH of the buffer and a target pH of the buffered solution so that the actual pH of the buffered solution is with ±
0.2 pH unit of the target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification