Stone pulverizing apparatus with improved working head and metho

Details Stone pulverizing apparatus with improved working head and metho Stone pulverizing apparatus with improved working head and metho

1989-03-13

1991-03-26

Hafer, Robert A.

Surgery

Instruments

Means for concretion removal

604 22, A61B 1720

Patent

active

050025490

ABSTRACT:
A method and apparatus for destroying a stone or other hard body located within the body of a living being at a location where the stone is within a liquid. The apparatus comprises a catheter having a rotatable working head at its distal end. The working head comprises at least two radially extending blade-like members, each having plural force concentrating impacting surfaces and plural grooves. The working head is rotated at a high speed while it is in engagement with the stone. The rotation of the working head produces a flow of the liquid past the working head, with some portion of the liquid flowing through the plural grooves. The impacting surfaces impact the stone to break it into particles which are carried by the flow into repeated engagement with the impacting surfaces for further pulverization. The liquid flowing through the grooves reduces the boundary layer effect which tends to sweep smaller particles away from the impacting surfaces. Accordingly, the efficient pulverization of the particles and the destruction of the stone is effected without appreciable injury to the body of the being.

REFERENCES:
patent: 4679558 (1987-07-01), Kensey et al.
patent: 4686982 (1987-08-01), Nash
patent: 4700705 (1987-10-01), Kensey et al.
patent: 4811735 (1989-03-01), Nash et al.
patent: 4823793 (1989-04-01), Angulo et al.
patent: 4850957 (1989-07-01), Summers
patent: 4895560 (1990-01-01), Papantonakos
patent: 4907572 (1990-03-01), Borodulin et al.

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