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For an intervenous infusion system and the like, an escapement device to be disposed between a source of fluid and a receiver of fluid. The device allows fluid to escape from the source and then intermittently takes a fixed, measured quantity of such fluid and transfers that quantity to the receiver

For an intervenous infusion system and the like, an escapement device to be disposed between a source of fluid and a receiver of fluid. The device allows fluid to escape from the source and then intermittently takes a fixed, measured quantity of such fluid and transfers that quantity to the receiver.

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In an intervenous infusion system: a drip chamber including a cap on the top thereof; a connection spike; escapement means connected between the drip chamber and spike for extracting fluid from the spike and intermittently transferring identical amounts of said fluid to said drip chamber, the escape

In an intervenous infusion system: a drip chamber including a cap on the top thereof; a connection spike; escapement means connected between the drip chamber and spike for extracting fluid from the spike and intermittently transferring identical amounts of said fluid to said drip chamber, the escapement means comprising: an elongated, hollow escapement cylinder, the bottom end of which is connected to the cap of said drip chamber and the top end of which is connected to said spike to extend vertically upwardly when said drip chamber is mounted for use; elongated shuttle means inside of said escapement cylinder; guide means on said shuttle engaging the inside wall of said escapement cylinder mounting the shuttle for reciprocating motion along the axis of the escapement cylinder; conically shaped fluid intake plug means connected to and disposed at the top end of said shuttle; fluid control mechanism made of flexible material and connected to and disposed at the bottom end of said shuttle and formed with conically shaped fluid discharge plug means; first means on said cap formed with a conically shaped fluid discharge valve seat means coaxial with the axis of said escapement cylinder to be engaged and disengaged by said discharge plug means and also formed with a drip passageway to pass fluid to said drip chamber; second means on said spike formed with conically shaped fluid intake valve seat means coaxial with the axis of said escapement cylinder to be engaged and disengaged by said intake plug means; said shuttle means being dimensioned to permit passage of fluid through said escapement cylinder as between said fluid intake valve seat means and said fluid discharge valve seat means; said fluid control mechanism also formed with conically shaped skirt surrounding said discharge plug means, the outer perimeter of the skirt having an annular lip closely adjacent to the inside wall of said escapement cylinder to provide an annular space between the wall and the lip; drive means for moving said shuttle from a first position to a second position, the first position being below said second position: (a) in the first position said fluid intake plug means being spaced away from said fluid intake valve seat means and said fluid discharge valve plug means engaging said fluid discharge valve seat means; (b) in the second position said fluid intake plug means engaging said fluid intake valve seat means and said fluid discharge plug means being spaced away from said fluid discharge valve seat means, the fluid discharge valve seat means, the fluid discharge plug means, the skirt and lip, and the inside wall of the escapement cylinder forming a volumetric fluid measuring chamber; when said shuttle is moving from said first position up to said second position: (a) said conical shape of said skirt, said flexibility of said skirt, and said space between said lip and the inside wall of said escapement cylinder functioning to permit fluid to pass through the space and flow into said volumetric measuring chamber until said fluid intake plug means engages said fluid intake valve seat means; when said shuttle is moving from said second position down to said first position: (a) said conical shape of said skirt and said flexibility of said skirt and fluid in said volumetric measuring chamber causing the said lip to slidingly seal against the inside wall of said escapement cylinder so that fluid in said volumetric measuring chamber is pushed out of the volumetric measuring chamber until said discharge plug means engages said discharge seat means; and (b) the movement of said fluid intake plug means away from said fluid intake valve means permitting new fluid to flow into said escapement cylinder; and check valve means connected to said cap and having an exit passage in series with said drip passage way, the check valve means functioning when the shuttle is moving from said second position down to said first position to permit fluid in the drip passageway to flow through the exit passage into said drip chamber and functioning when said shuttle is moving from said first position up to said second position to stop any backflow of fluid in the exit passage.