Methods and apparatus for buffering anesthetics
First Claim
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1. A method for buffering an anesthetic cartridge, said method comprising:
- providing an anesthetic cartridge having a septum;
providing a buffer cartridge having a septum and plunger;
penetrating a transfer needle through the septum on the buffer cartridge and the septum on the anesthetic cartridge, whereby a fluid transfer path is established;
penetrating an exhaust needle through the septum on the anesthetic cartridge but not the septum on the buffer cartridge; and
advancing the plunger on the buffer cartridge to transfer a volume of buffer from the buffer cartridge into the anesthetic cartridge while causing an equal volume of anesthetic to be expelled from the anesthetic cartridge through the exhaust needle.
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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.
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Citations
23 Claims
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1. A method for buffering an anesthetic cartridge, said method comprising:
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providing an anesthetic cartridge having a septum; providing a buffer cartridge having a septum and plunger; penetrating a transfer needle through the septum on the buffer cartridge and the septum on the anesthetic cartridge, whereby a fluid transfer path is established; penetrating an exhaust needle through the septum on the anesthetic cartridge but not the septum on the buffer cartridge; and advancing the plunger on the buffer cartridge to transfer a volume of buffer from the buffer cartridge into the anesthetic cartridge while causing an equal volume of anesthetic to be expelled from the anesthetic cartridge through the exhaust needle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device for transferring a volume of buffer solution into an anesthetic cartridge, said device comprising:
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a buffer cartridge having a septum and a plunger; a needle assembly having a transfer needle and an exhaust needle, and a pusher which engages the plunger on the buffer cartridge; wherein the transfer needle penetrates the septum of the buffer cartridge, the needle assembly detachably receives an anesthetic cartridge, and the transfer and exhaust needles penetrate a septum on the anesthetic cartridge so that the pusher can advance the plunger on the buffer cartridge to transfer buffer through the transfer needle into the anesthetic cartridge and excess anesthetic from the anesthetic cartridge is exhausted through the exhaust needle; further comprising a first stop which limits advancement of the pusher to deliver a first volume of buffer as the pusher is advanced. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification