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US 5,439,451 AGranted
Capless medical backcheck valve
AssigneeB. Braun Medical Inc.
InventorsMichael Collinson, Alan K. Plyley, Russell J. Redmond, Claude Vidal
Life of this patent
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Abstract
A medical backcheck valve includes a hollow housing containing an upwardly biased piston assembly for controlling liquid flow therethrough. The piston assembly comprises a substantially rigid plug having one end protruding from the upper end of the housing, and a flexible sheath covering having a relatively small diameter upper end surrounding the plug, a main seal for controlling flow through said first flow space, and a tubular lower end, secured at the bottom of the housing, for preventing liquid from entering within the covering.
Claims19
A medical backcheck valve comprising
- a hollow housing having an upper end and a lower end,
- a fitting secured within the lower end of the housing,
- a piston assembly contained within the housing for controlling liquid flow therethrough,
- said piston assembly comprising a substantially rigid plug having one end protruding from the upper end of the housing, and a tubular flexible covering having a relatively small diameter upper end surrounding the plug, with a first flow space between the housing and the sheath, a main seal for controlling flow through said first flow space, and a tubular lower end whose bottom is secured to at least one of the fitting and the housing to prevent liquid from entering within the tubular flexible covering.
1 more element
Dependencies are inferred from the claim text.