Syringe piston with check valve seal
First Claim
1. A fluid syringe comprising:
- a syringe barrel comprising an interior wall and a sealed main fluid chamber;
a syringe piston slidably coupled within the syringe barrel, the syringe piston comprising a piston seal forming an interference fluid seal against the interior wall; and
a check valve seal coupled to the syringe piston and located between the piston seal and the main fluid chamber, the check valve seal forming an interference fluid seal against the interior wall when the syringe piston is unloaded, and the check valve seal disengaging the interior wall to allow gas flow from the main fluid chamber toward the piston seal when the syringe piston is loaded.
1 Assignment
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Accused Products
Abstract
A fluid syringe of the type used with fluid infusion devices is presented here. The fluid syringe generally includes a barrel, a piston, and a check valve seal. The barrel has an interior wall and a sealed main fluid chamber. The piston is slidably coupled within the barrel, and the piston has a piston seal forming an interference fluid seal against the interior wall. The check valve seal is coupled to the piston, and it is located between the piston seal and the main fluid chamber. The check valve seal forms an interference fluid seal against the interior wall when the piston is unloaded, and it disengages the interior wall to allow gas flow from the main fluid chamber toward the piston seal when the piston is loaded.
244 Citations
10 Claims
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1. A fluid syringe comprising:
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a syringe barrel comprising an interior wall and a sealed main fluid chamber; a syringe piston slidably coupled within the syringe barrel, the syringe piston comprising a piston seal forming an interference fluid seal against the interior wall; and a check valve seal coupled to the syringe piston and located between the piston seal and the main fluid chamber, the check valve seal forming an interference fluid seal against the interior wall when the syringe piston is unloaded, and the check valve seal disengaging the interior wall to allow gas flow from the main fluid chamber toward the piston seal when the syringe piston is loaded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification