Administration set including burette with pivotable air valve

Claim 2

In an administration set including a burette having a burette chamber and a main liquid inlet, an injection site and an air valve communicating with said chamber, and a drip chamber connected downstream of the burette chamber, the improvement comprising, in combination: said air valve comprising a stationary port extending from a top portion of said burette chamber and defining a bore therethrough; said port including a fitting shaped to define an open internal portion, a top portion of said fitting shaped to define a passageway, said fitting closing said port except for said passageway, with said passageway being substantially smaller than said open internal portion; a pivotable closure overlying said port and being pivotally connected therewith, said pivotable closure shaped to define an opening for communication with said passageway when said closure is pivoted to a predetermined open position; and means for segregating said closure opening and said passageway when said closure is not in said predetermined open position; and a filter member located transverse said bore and directly underlying said passageway, said segregating means comprising a resilient member movable with the pivoting movement of said closure, to close and seal said passageway when the closure is not in said predetermined open position, said resilient member comprising a ball carried by said closure and spaced from said opening defined by said closure.

Claim 3

A device as described in claim 1, said fitting defining an inclined groove for receiving said ball when the closure is pivoted to its predetermined open position.

Claim 4

A device as described in claim 1, said ball comprising a silicone rubber sphere.

Claim 5

A device as described in claim 2, said inclined groove being dimensioned so as to enable said ball to not be under compression when the closure is in its predetermined open position, and so as to enable said ball to move up the incline when the closure is pivoted to a closed position, to place the ball under compression, sealing said passageway when the closure is in a closed position.

Claim 6

In an administration set including a burette having a burette chamber and a main liquid inlet, an injection site and an air valve communicating with said chamber, and a drip chamber connected downstream of the burette chamber, the improvement comprising, in combination: said air valve comprising a stationary port extending from a top portion of said burette chamber and defining a bore therethrough, said stationary port comprising an open annular member and a separate fitting fastened to said open annular member, said fitting shaped to define an open internal portion, a top portion of said fitting shaped to define a passageway, said fitting closing said port except for said passageway, with said passageway being substantially smaller than said open internal portion; a pivotable closure overlying said port and being pivotally connected therewith, said pivotable connection being between said separate fitting and said pivotable closure and comprising a circular flange and cooperating groove arrangement with one of said fitting and closure carrying a flange and the other of said fitting and closure defining the cooperating groove; said pivotable closure shaped to define an opening for communication with said passageway when said closure is pivoted to a predetermined open position; means for segregating said closure opening and said passageway when said closure is not in said predetermined open position; and a filter member located transverse said bore and directly underlying said passageway; said segregating means comprising a resilient member movable with the pivoting movement of said closure, to close and seal said passageway when the closure is not in said predetermined open position, said resilient member comprising a ball carried by said closure and spaced from said opening defined by said closure.

Claim 7

In an administration set including a burette having a burette chamber and a main liquid inlet, an injection site and an air valve communicating with said chamber, and a drip chamber connected downstream of the burette chamber, the improvement comprising, in combination: said air valve comprising a stationary port extending from a top portion of said burette chamber and defining a bore therethrough, said stationary port comprising an open annular member and a separate fitting fastened to said open annular member, said fitting shaped to define an open internal portion, a top portion of said fitting shaped to define a passageway, said fitting closing said port except for said passageway, with said passageway being substantially smaller than said open internal portion; a pivotable closure overlying said port and being pivotally connected therewith, said pivotable connection being between said separate fitting and said pivotable closure and comprising a circular flange and cooperating groove arrangement with one of said fitting and closure carrying a flange and the other of said fitting and closure defining the cooperating groove; said pivotable closure shaped to define an opening for communication with said passageway when said closure is pivoted to a predetermined open position; means for segregating said closure opening and said passageway when said closure is not in said predetermined open position; and a filter member located transverse said bore and directly underlying said passageway; said segregating means comprising a resilient member movable with the pivoting movement of said closure, to close and seal said passageway when the closure is not in said predetermined open position, said resilient member comprising a ball carried by said closure and spaced from said opening defined by said closure.

Claim 8

A device as described in claim 5, said fitting defining an inclined groove for receiving said ball when the closure is pivoted to its predetermined open position.

Claim 9

A device as described in claim 6, said inclined groove being dimensioned so as to enable said ball to not be under compression when the closure is in its predetermined open position, and so as to enable said ball to move up the incline when the closure is pivoted to a closed position, to place the ball under compression, sealing said passageway when the closure is in a closed position.

Claim 10

In an administration set including a burette having a burette chamber and a main liquid inlet, an injection site and an air valve communicating with said chamber, and a drip chamber connected downstream of the buretter chamber, the improvement comprising, in combination: said air valve comprising a stationary port extending from a top portion of said burette chamber and defining a bore therethrough, said stationary port comprising an open annular member and a separate fitting fastened to said open annular member; said fitting shaped to define an open internal portion, a top portion of said fitting shaped to define a passageway, said fitting closing said port except for said passgeway, with said passageway being substantially smaller than said open internal portion; a pivotable closure overyling said port and being pivotally connected therewith, said pivotable closure shaped to define an opening for communication with said passageway when said closure is pivoted to a predetermined open position, said pivotable connection being between said separate fitting and said pivotable closure and comprising a circular flange and cooperating groove arrangement with one of said fitting and closure carrying a flange and the other of said fitting and closure defining the cooperating groove; means for segregating said closure opening and said passageway when said closure is not in said predetermined open position, said segregating means comprising a resilient ball movable with the pivoting movement of said closure, to close and seal said passageway when the closure is not in said predetermined open position, said fitting defining an inclined groove for receiving said ball when the closure is pivoted to its predetermined open position, said fitting defining an inclined groove for receiving said ball when the closure is pivoted to its predetermined open position, said inclined groove being dimensioned so as to enable said ball to not be under compression when the closure is in its predetermined open position, and so as to enable said ball to move up the incline when the closure is pivoted to a closed position, to place the ball under compression, sealing said passageway when the closure is in a closed position; and a filter member located transverse said bore and directly underlying said passageway, said port defining support means for receiving and supporting said filter member.

Claim 11

In an administration set including a burette having a burette chamber and a main liquid inlet, an injection site and an air valve communicating with said chamber, and a drip chamber connected downstream of the buretter chamber, the improvement comprising, in combination: said air valve comprising a stationary port extending from a top portion of said burette chamber and defining a bore therethrough, said stationary port comprising an open annular member and a separate fitting fastened to said open annular member; said fitting shaped to define an open internal portion, a top portion of said fitting shaped to define a passageway, said fitting closing said port except for said passgeway, with said passageway being substantially smaller than said open internal portion; a pivotable closure overyling said port and being pivotally connected therewith, said pivotable closure shaped to define an opening for communication with said passageway when said closure is pivoted to a predetermined open position, said pivotable connection being between said separate fitting and said pivotable closure and comprising a circular flange and cooperating groove arrangement with one of said fitting and closure carrying a flange and the other of said fitting and closure defining the cooperating groove; means for segregating said closure opening and said passageway when said closure is not in said predetermined open position, said segregating means comprising a resilient ball movable with the pivoting movement of said closure, to close and seal said passageway when the closure is not in said predetermined open position, said fitting defining an inclined groove for receiving said ball when the closure is pivoted to its predetermined open position, said fitting defining an inclined groove for receiving said ball when the closure is pivoted to its predetermined open position, said inclined groove being dimensioned so as to enable said ball to not be under compression when the closure is in its predetermined open position, and so as to enable said ball to move up the incline when the closure is pivoted to a closed position, to place the ball under compression, sealing said passageway when the closure is in a closed position; and a filter member located transverse said bore and directly underlying said passageway, said port defining support means for receiving and supporting said filter member.

Claim 12

A device as described in claim 8, said closure opening being located to directly overlie said passageway when said closure is in its predetermined open position.