CPC A61M 5/31513 (2013.01) [A61M 5/145 (2013.01); A61M 5/14586 (2013.01); A61M 5/2425 (2013.01); A61M 5/14546 (2013.01); A61M 5/14566 (2013.01); A61M 5/14593 (2013.01); A61M 5/31515 (2013.01); A61M 2005/14513 (2013.01); A61M 2005/14553 (2013.01); A61M 2205/36 (2013.01)] | 16 Claims |
1. A syringe for a fluid delivery system, the syringe comprising:
a pressure jacket having a distal end, a proximal end, and a throughbore extending between the distal end and the proximal end; and
a rolling diaphragm disposed within the throughbore of the pressure jacket, the rolling diaphragm having a proximal end having a concave end wall shaped for engagement with a plunger, a distal end received at the distal end of the pressure jacket, the distal end of the rolling diaphragm having a discharge neck, and a sidewall extending between the proximal end and the distal end of the rolling diaphragm along a longitudinal axis, at least one of the end wall and at least a portion of the sidewall having a non-uniform thickness,
wherein at least a portion of the sidewall of the rolling diaphragm is flexible and rolls upon itself such that an outer surface of the sidewall at a folding region is folded in a radially inward direction as the plunger is advanced from the proximal end to the distal end of the rolling diaphragm and such that the outer surface of the sidewall unrolls as the folding region is unfolded in a radially outward direction as the plunger is retracted from the proximal end to the distal end of the rolling diaphragm,
wherein the concave end wall of the rolling diaphragm has a plunger engagement portion that protrudes proximally from the concave end wall such that the plunger engagement portion is at least partially recessed within a cavity defined by the concave end wall at least in an unrolled state or a rolled state of the rolling diaphragm and prior to engagement with the plunger, and
wherein the concave end wall has a radiused folding edge that transitions into a distally extending ramp having a continuously increasing thickness.
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