Cannula introducers

Details Cannula introducers Cannula introducers

1984-06-25

1985-12-17

Pellegrino, Stephen C.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604164, 128305, A61M 500

Patent

active

045590419

ABSTRACT:
A cannula introducer device for providing a cut in a blood vessel wall and inserting a cannula into such cut. The device includes a rod housing carried by a pistol-shaped handle. Telescoped within the rod housing is a blade rod terminating at its distal end in a knife blade and extending from the proximal end of the rod housing to be secured to a reverse hammer-cam follower which is biased in a direction to move the blade rod proximately into the rod housing. Surrounding the rod housing and releasably carried by the handle is a cannula, the distal end being substantially co-extensive with the rod housing. A first trigger in the handle engages the reverse hammer and upon proximal movement of the trigger moves the blade out of the distal end of the rod housing and cannula where the operator can use the blade to cut an opening in the blood vessel. A spring loaded stop engages the trigger at its blade extended position. Further proximal movement of the trigger overcomes the stop and allows the reverse hammer to be biased to move the blade rod proximally into the confines of the rod housing. The entire device is then advanced distally to insert the distal end of the cannula in the cut in the vessel wall, and the cannula is then withdrawn from the handle and supporting blade housing. In a second embodiment, a second trigger is mounted on the handle and is spring loaded so that its upper end moves proximally. A rod pivotally secured to the upper end of the trigger extends distally into a notch at the proximal end of the cannula. Upon activation of the second trigger the rod pushes the cannula in a distal direction relative to the handle.

REFERENCES:
patent: 3538916 (1970-11-01), Wiles et al.
patent: 3762416 (1973-10-01), Moss et al.
patent: 3809095 (1974-05-01), Cimber
patent: 4016879 (1977-04-01), Mellor
patent: 4137920 (1979-02-01), Bonnett

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