Reusable fluid pumping device
Pump assemblies for use with an IV set are described herein. A pump assembly includes a rotatable crank, a piston rod, and a diaphragm assembly. The crank includes a crank profile defining a plurality of lobes. The piston rod includes a first follower and a second follower spaced apart from the first follower. The rotation of the crank relative to the piston rod causes the piston rod to reciprocate relative to the crank. The diaphragm assembly includes a housing and a diaphragm member. The diaphragm member is coupled to the housing and cooperatively defines a volume in fluid communication with the IV set. The diaphragm member is movable between an extended position configured to draw in fluid from the IV set and a contracted position configured to expel fluid into the IV set. The diaphragm member is coupled to the piston rod to reciprocate the diaphragm member.
1 . A pump assembly for use with an IV set, the pump assembly comprising:
a rotatable crank with an exterior profile that defines a plurality of lobes;
a biasing member coupled to the crank and configured to rotate the crank;
a piston rod comprising a first follower and a second follower spaced apart from the first follower, wherein the first follower contacts the exterior profile to selectively advance the piston rod, the second follower contacts the exterior profile to selectively retract the piston rod, and rotation of the crank in a single rotation direction relative to the piston rod causes the piston rod to cyclically reciprocate relative to the crank; and
a diaphragm assembly comprising:
a housing; and
a resilient diaphragm member coupled to the housing and cooperatively defining a volume in fluid communication with the IV set, wherein the diaphragm member is movable between an extended position configured to increase the volume and to draw in fluid from the IV set and a contracted position configured to decrease the volume and to expel fluid into the IV set, and the diaphragm member is coupled to the piston rod to reciprocate the diaphragm member between the extended position and the contracted position.
2 . The pump assembly of claim 1 , further comprising a key shaft coupled to the biasing member, wherein the key shaft is rotatable to energize the biasing member.
3 . The pump assembly of claim 1 , comprising a plurality of gears coupled to the biasing member and the crank.
4 . The pump assembly of claim 1 , wherein the crank is manually rotatable.
5 . The pump assembly of claim 1 , wherein the diaphragm member is releasably coupled to the piston rod.
6 . The pump assembly of claim 1 , further comprising a check valve in fluid communication with the volume to prevent backflow of fluid into the volume.
7 . The pump assembly of claim 1 , wherein the plurality of lobes are each spaced apart along an entirety of the exterior profile about an axis of rotation.
8 . The pump assembly of claim 1 , wherein the biasing member comprises a torsional spring.
9 . A pump assembly for use with an IV set, the pump assembly comprising:
a rotatable crank;
a piston rod comprising a first follower and a second follower each in contact with an exterior profile of the crank, wherein rotation of the crank in a single rotation direction relative to the piston rod causes the piston rod to cyclically reciprocate relative to the crank;
a biasing member coupled to the crank and configured to receive energy and rotate the crank upon release of the energy; and
a key shaft coupled to the biasing member, wherein the key shaft is rotatable to provide energy to the biasing member; and
a diaphragm assembly comprising:
a housing; and
a resilient diaphragm member coupled to the housing and cooperatively defining a volume in fluid communication with the IV set, wherein the diaphragm member is movable between an extended position configured to draw in fluid from the IV set and a contracted position configured to expel fluid into the IV set, and the diaphragm is coupled to the piston rod to reciprocate the diaphragm member between the extended position and the contracted position.
10 . The pump assembly of claim 9 , comprising a plurality of gears coupled to the biasing member and the crank.
11 . The pump assembly of claim 9 , wherein the crank is manually rotatable.
12 . The pump assembly of claim 9 , wherein the diaphragm member is releasably coupled to the piston rod.
13 . The pump assembly of claim 9 , further comprising a check valve in fluid communication with the volume to prevent backflow of fluid into the volume.
14 . The pump assembly of claim 9 , wherein the biasing member comprises a torsional spring.