Anesthesia system

Claim 2

An anesthesia system comprising a flow stream to and away from a patient and source means of oxygen and anesthetic, said stream having a sample bypass, said bypass receiving a sample of the flow in said stream and having analysis means for determining the concentration of certain constituents in said sample flow, and valve means connected to said bypass and adapted to cut off sample flow to said bypass and open said bypass to a second flow of known concentrations to permit the bypass to sample said second flow and check the accuracy of the analysis means, said valve means comprising a pair of parallel plates, one of said plates has means slidably receiving the other of said plates and stop means to limit sliding movement, each plAte has a pair of nipples connected to respective bypass tubes and extending perpendicularly to the plates with each extending oppositely and having the same spacing, and one of said plates has a hole therethrough between its pair of nipples so that when the pairs of nipples are aligned in a first position, the bypass will sample flow from said stream and when the pairs of nipples are nonaligned in a second position, the opening of said one plate is aligned with a nipple of the other plate to permit the bypass to sample said second flow.

Claim 3

An anesthetic system comprising a flow stream to and from a patient and source means of oxygen, nitrous oxide and vaporizable anesthetic agent, said stream having a sample bypass, said bypass receiving a sample of flow in said stream and having analysis means, said analysis means including oxygen analysis means for determining the oxygen content of the sample flow and anesthetic analysis means for determining the concentration of said vaporizable anesthetic agent in said sample flow, vale means connected to said bypass and adapted to cut off flow to said bypass and open said bypass to a second flow of known concentrations to permit the bypass to sample said second flow and check the accuracy of the analysis means, said valve means comprising a pair of parallel plates, one of said plates has means slidably receiving the other of said plates and stop means to limit siding movement, each plate has a pair of nipples connected to respective bypass tubes and extending perpendicularly thereto with each pair extending oppositely and having the same spacing, and one of said plates has a hole therein between said nipples so that when the pairs of nipples are aligned in a first position, the bypass will sample flow from said stream and when the pairs of nipples are nonaligned in a second position, the opening of said one plate is aligned with a nipple of the other plate to permit the bypass to sample said second flow.

Claim 4

An anesthetic system comprising a flow stream to and from a patient and source means of oxygen, nitrous oxide and vaporizable anesthetic agent, said stream having a sample bypass, said bypass receiving a sample of flow in said stream and having analysis means, said analysis means including oxygen analysis means for determining the oxygen content of the sample flow and anesthetic analysis means for determining the concentration of said vaporizable anesthetic agent in said sample flow, vale means connected to said bypass and adapted to cut off flow to said bypass and open said bypass to a second flow of known concentrations to permit the bypass to sample said second flow and check the accuracy of the analysis means, said valve means comprising a pair of parallel plates, one of said plates has means slidably receiving the other of said plates and stop means to limit siding movement, each plate has a pair of nipples connected to respective bypass tubes and extending perpendicularly thereto with each pair extending oppositely and having the same spacing, and one of said plates has a hole therein between said nipples so that when the pairs of nipples are aligned in a first position, the bypass will sample flow from said stream and when the pairs of nipples are nonaligned in a second position, the opening of said one plate is aligned with a nipple of the other plate to permit the bypass to sample said second flow.

Claim 5

In an anesthetic system having a flow stream for delivering anesthetic to a patient, a bypass system comprising a first tubing means for withdrawing fluid from the flow stream, a second tubing means for returning withdrawn fluid to the flow stream, analysis means intermediate said first and second tubing means for determining the anesthetic content of the withdrawn fluid, and a valve means connected to said first and second tubing means, said valve means comprising a pair of parallel plates, one of said plates having a pair of holes in alignment with said tubing means and the other of said plates slidingly received in said one plate and having three holes therein, said other plate being movable between a first position wherein two of its holes are aligned with said tubing means to introduce withdrawn fluid to said analysis means, and a second position wherein the third hole is aligned with said first tubing means whereby a second fluid is allowed to enter said first tubing to said analysis means.

Claim 6

In an anesthetic system having a flow stream for delivering anesthetic to a patient, a bypass system comprising a first tubing means for withdrawing fluid from the flow stream, a second tubing means for returning withdrawn fluid to the flow stream, analysis means intermediate said first and second tubing means for determining the anesthetic content of the withdrawn fluid, and a valve means connected to said first and second tubing means, said valve means comprising a pair of parallel plates, one of said plates having a pair of holes in alignment with said tubing means and the other of said plates slidingly received in said one plate and having three holes therein, said other plate being movable between a first position wherein two of its holes are aligned with said tubing means to introduce withdrawn fluid to said analysis means, and a second position wherein the third hole is aligned with said first tubing means whereby a second fluid is allowed to enter said first tubing to said analysis means.

Claim 7

An anesthesia system as set forth in claim 3 wherein said second fluid is air.

Claim 8

An anesthesia system as set forth in claim 4 wherein said valve means includes stop means to limit the relative movement of said plates at said first and second positions.

Claim 9

In an anesthesia system having a flow stream for delivering anesthetic to a patient, a bypass system comprising tubing means for withdrawing fluid from the flow stream, analysis means for determining the anesthetic content of the withdrawn fluid, and valve means in said tubing for interrupting the flow of withdrawn fluid to said analysis means, said valve means comprising first and second parallel plates, said first plate having at least one opening, said second plate having at least two openings, said plates slidingly received with respect to each other between a first position wherein one of said openings in said second plate is aligned with said at least one opening in said first plate whereby withdrawn fluid passes therethrough to said analysis means and a second posItion wherein the other of said openings in said second plate is aligned with said at least one opening in said first plate whereby a second fluid is introduced to said analysis means.

Claim 10

In an anesthesia system having a flow stream for delivering anesthetic to a patient, a bypass system comprising tubing means for withdrawing fluid from the flow stream, analysis means for determining the anesthetic content of the withdrawn fluid, and valve means in said tubing for interrupting the flow of withdrawn fluid to said analysis means, said valve means comprising first and second parallel plates, said first plate having at least one opening, said second plate having at least two openings, said plates slidingly received with respect to each other between a first position wherein one of said openings in said second plate is aligned with said at least one opening in said first plate whereby withdrawn fluid passes therethrough to said analysis means and a second posItion wherein the other of said openings in said second plate is aligned with said at least one opening in said first plate whereby a second fluid is introduced to said analysis means.

Claim 11

An anesthesia system as set forth in claim 6 wherein said second fluid is air.