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US 10,946,132 B2Granted
Access cannula comprising blocking device
AssigneeB. Braun Avitum AG
InventorKai-Uwe Ritter
Life of this patent
Estimating the term…
Abstract
An access cannula which includes a dwell tube that serves as an access during treatment. A blocking device that maintains the dwell tube kinked in an idle position. In the idle position, the dwell tube is maintained kinked, preferably at a predetermined kink point that corresponds to a position in which a force exerted by the blocking device upon the dwell tube, the elastic reset force of the dwell tube and, where appropriate, a pressure prevailing in the dwell tube, balance one another.
Claims17
An access cannula comprising:
- a dwell tube that defines a longitudinal axis along the center of the dwell tube, the dwell tube configured to serve as an access during treatment in a stretched position;
- and
- a blocking device configured to maintain the dwell tube kinked in an idle position, wherein:
- the blocking device includes a spring element which is arranged with a first end at a first position of the dwell tube and which is connected or connectable with a second end at a second position on the dwell tube,
- the second position is spaced from the first position by a first distance measured along the longitudinal axis of the dwell tube when the dwell tube is in the stretched position,
- the second position is spaced from the first position by a second distance measured along the longitudinal axis of the dwell tube when the dwell tube is kinked in the idle position, and
- the second distance is greater than the first distance, such that the second end of the spring element moves away from the first end of the spring element along the longitudinal axis of the dwell tube as the dwell tube transitions from the stretched position to the idle position.
4 more elements
Dependencies are inferred from the claim text.