Administration set including burette with pivotable air valve

Claim 2

In a medical device having a chamber, an air valve comprising a stationary port extending from a wall of said 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 the open internal portion, a filter member located transverse said bore and directly underlying said passageway, a pivotable closure overlying the port and being pivotally connected therewith, said pivotable closure shaped to define an opening for communication with said passageway when the closure is pivoted to a predetermined open position, and means for segregating said closure opening from said passageway when said closure is in its closed position, 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 fitting being proportioned to compress the resilient member while it is closing and sealing said passageway.

Claim 3

The medical device of claim 1 in which a space is provided to permit said resilient member to expand out of its compressed configuration when the closure is pivoted to the predetermined open position.

Claim 4

The medical device of claim 2 in which said resilient member comprises a resilient ball carried by said closure and spaced from the opening defined by said closure.

Claim 5

The medical device of claim 3 in which said fitting and closure define an inclined groove for conveying said ball when the closure is pivoted to its predetermined open position to a location to hold the ball in relatively uncompressed position, said inclined groove being dimensioned so as to enable the ball to move up the inclined groove when the closure is pivoted to a closed position to place the ball under compression while sealing said passageway when the closure is in a closed position.

Claim 6

In a medical device having a chamber, an air valve communicating with said chamber, said air valve comorising a stationary port extending from an outer portion of said chamber and defining a bore therethrough, a fitting carried on said port, 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 the passageway, with the passageway being substantially smaller than the open internal portion, a filter member located transverse said bore and directly underlying said passageway, pivotable closure overlying the port and 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, resilient ball means for segregating said closure opening from said passageway when the closure is not in said predetermined open position, said resilient ball being movable with the pivoting movement of said closure and spaced from the opening defined by said closure, to seal said passageway in one rotating position of the closure and to roll away from said passageway in another rotating position to permit communication between the passageway and the opening, said fitting and closure defining an inclined groove for conveying said ball when the closure is pivoted to its predetermined open position to a location to hold the ball in relatively uncompressed position, said inclined groove being dimensioned so as to enable the ball to move up the inclined groove when the closure is pivoted to a closed position to place the ball under compression while sealing said passageway when the closure is in a closed position.

Claim 7

In a medical device having a chamber, an air valve communicating with said chamber, said air valve comorising a stationary port extending from an outer portion of said chamber and defining a bore therethrough, a fitting carried on said port, 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 the passageway, with the passageway being substantially smaller than the open internal portion, a filter member located transverse said bore and directly underlying said passageway, pivotable closure overlying the port and 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, resilient ball means for segregating said closure opening from said passageway when the closure is not in said predetermined open position, said resilient ball being movable with the pivoting movement of said closure and spaced from the opening defined by said closure, to seal said passageway in one rotating position of the closure and to roll away from said passageway in another rotating position to permit communication between the passageway and the opening, said fitting and closure defining an inclined groove for conveying said ball when the closure is pivoted to its predetermined open position to a location to hold the ball in relatively uncompressed position, said inclined groove being dimensioned so as to enable the ball to move up the inclined groove when the closure is pivoted to a closed position to place the ball under compression while sealing said passageway when the closure is in a closed position.

Claim 8

The medical device of claim 5 in which said ball is made of silicone rubber.

Claim 9

The medical device of claim 6 in which said closure opening is located to directly overlie said passageway when the closure is in its predetermined open position.