| 摘要 |
A contraceptive device for blocking a male urethra canal includes an expandable body unit having an elastic member covering a plurality of body segments, a forwardly opening cavity extending within the body unit and having first, second, and third progressively rearwardly spaced cavity regions collectively in the body segments, a cam member having an expansion cam and a forwardly extending shaft being movable in the cavity with the cam sequentially locatable in the first, second, and third regions thereof, for expanding the body unit from a contracted configuration for insertion into a male urethra penis cavity to an expanded configuration 10% or more larger than the contracted position for blocking the urethra when the cam is in the second region, the body contracting to the contracted configuration for permitting withdrawal of the body unit when the cam is in the third region, the cam member being blocked from moving from the second position to the first position and from the third position to the second position for preventing successive uses of the device, and a cam actuator having an expanding position and a contracting position on the shank of the cam member and a handle portion projecting forwardly of the body unit for manipulating the device, the cam member being blocked from the third position when the actuator is in the expanding position, the first position of the cam member being visually distinguishable from the other positions thereof externally of the device.
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