Apparatus and methods for cutting a material, especially with low material speed and high cutting torque. In some embodiments, the apparatus is a hand-held device for quietly cutting through an orthopedic cast with little or no generation of debris. In yet other embodiments, there is a method for au
Apparatus and methods for cutting a material, especially with low material speed and high cutting torque. In some embodiments, the apparatus is a hand-held device for quietly cutting through an orthopedic cast with little or no generation of debris. In yet other embodiments, there is a method for automatically advancing material past a shearing surface, such that the shearing action occurs at about the same velocity as the advancement. In yet other embodiments, there is a device for cutting material between a foot and a sharp edge, with the bottom of the foot being under the sharp edge to protect the skin of the patient.
대표청구항▼
1. An apparatus for cutting a layer of material, comprising: an electric motor;a wheel including a plurality of shearing sectors arranged in a first pattern about a first rotational axis, each said sector having a sharp edge, said wheel having a face, and said wheel being rotationally driven by said
1. An apparatus for cutting a layer of material, comprising: an electric motor;a wheel including a plurality of shearing sectors arranged in a first pattern about a first rotational axis, each said sector having a sharp edge, said wheel having a face, and said wheel being rotationally driven by said electric motor;a foot having a shearing surface extending from said foot in overlapping relationship with said wheel;a biasing member biasing the face of said wheel and the shearing surface into sliding contact with one another;a handle adapted and configured for being held by a human operator, said handle supporting said wheel, said foot, and said motor; andan electronic controller operably connected to said motor, said controller operating said motor so that the linear velocity of the sharp edge is substantially constant when cutting the material. 2. The apparatus of claim 1 wherein said wheel is a first wheel, which further comprises a second wheel having a plurality of teeth adapted and configured for pressing contact with the surface of the material, said second wheel being rotationally driven by said electric motor, wherein rotation of said second wheel advances the material past the shearing surface. 3. The apparatus of claim 2 wherein the shearing sectors are axially located to face the shearing surface and the teeth are axially located on the other side of the shearing surface. 4. The apparatus of claim 1 which further comprises means for automatically advancing the material past the shearing surface. 5. The apparatus of claim 4 wherein said advancing means is a second wheel having a plurality of teeth. 6. The apparatus of claim 5 wherein the teeth are adapted and configured for penetrating the surface of the material. 7. The apparatus of claim 4 wherein said advancing means is a plurality of teeth extending from said wheel. 8. The apparatus of claim 4 wherein said advancing means comes into frictional contact with the surface of the material. 9. The apparatus of claim 1 wherein said motor has an output speed and an output torque, and which further comprises a gear train having a driven member for receiving the output speed and output torque of said motor, said gear train having a driving member operating at a driving speed lower than the output speed and a driving torque higher than the output torque, said wheel being driven by the driving member, said gear train being supported by said handle. 10. The apparatus of claim 9 wherein said motor and said gear train coact to rotate said wheel in excess of a complete revolution. 11. The apparatus of claim 9 wherein said gear train includes at least one worm gear pair. 12. The apparatus of claim 11 wherein said worm gear pair is a first worm gear pair and which further comprises a second worm gear pair, said first pair driving said second pair. 13. The apparatus of claim 1 wherein said wheel has a flat face that faces toward the shearing surface. 14. The apparatus of claim 1 wherein said wheel is biased toward contact between the face of said wheel and the shearing surface. 15. The apparatus of claim 14 which further comprises a spring for biasing the wheel of said face toward the shearing surface. 16. The apparatus of claim 1 wherein the linear velocity of the sharp edge is less than about two inches per second. 17. The apparatus of claim 1 wherein the linear velocity is a first substantially constant linear velocity, and which further comprises a switch for providing an operator input signal to said controller, said controller interpreting the operator input signal to operate said wheel at the first substantially constant linear velocity. 18. The apparatus of claim 1 which further comprises a battery, said handle having two opposing ends, said battery being supported from one end of said handle and said motor being suspended from the other end of said handle. 19. The apparatus of claim 1 which further comprises a battery, said handle having two opposing ends, said battery being supported from one end of said handle and said wheel being suspended from the other end of said handle. 20. The apparatus of claim 1 wherein said controller interprets the operator input signal to operate said wheel at either the first substantially constant linear velocity or a second substantially constant linear velocity different than the first linear velocity, each of the first linear velocity and the second linear velocity being less than about two inches per second. 21. The apparatus of claim 1 wherein said motor rotates said wheel in excess of a complete revolution. 22. The apparatus of claim 1, wherein the shearing surface and the face of said wheel are substantially flat. 23. The apparatus of claim 1, wherein the shearing surface and the face of said wheel are substantially flat and define planes that are substantially parallel to one another. 24. The apparatus of claim 1, wherein the face of the wheel defines a plane that is approximately perpendicular to the axis around which the wheel rotates.
Pitzen James F. (Maplewood MN) Smith Jeffrey D. (Marine on St. Croix MN) Alexson Charles E. (Hayward WI) Fenske Lawrence J. (Oregon WI), Battery housing for an orthopedic surgical device.
Long, Jack F.; Maroney, Brian John; Sanders, Roy; Cordes, Kevin M.; Fisher, Michael G., Blade for resection of bone for prosthesis implantation, blade stop and method.
Scholz Matthew T. (Woodbury MN) Bartizal Dennis C. (Woodbury MN) Reed Katherine E. (Stillwater MN) Larson Wayne E. (Maplewood MN) Ersfeld Dean A. (Maplewood MN) Sandvig Timothy C. (Woodville WI) Buck, Curable resin coated sheet having reduced tack.
Duncan C. Warren (2725 Fremont La. Costa Mesa CA 92626) Glynn William D. (521 Babbs Rd. West Suffield CT 06093), Dust disposal attachment for a rotary element of a power tool.
Matzo David (Leinfelden-Echterdingen DEX) Gansel Eduard (Dettenhausen DEX) Schramm Heribert (Stuttgart DEX), Electric motor operated hand circular saw.
Hofmann, Albrecht; Krondorfer, Harald; Schomisch, Thomas, Hand machine tool comprising two cutting disks, which rotate counter and immediately adjacent to one another, and means for chucking the cutting disks for a hand machine tool of this type.
Braunbach Karl-Heinz (Leinfelden-Echterdingen DEX) Zaiser Adolf (Koengen DEX) Bloechle Hans (Stuttgart DEX) Demuth Thomas (Marbach DEX), Hand power tool with turnable base plate.
Carusillo Steven J. (Kalamazoo MI) Eager Kris D. (Richland MI) Grulke David H. (Battle Creek MI), Handpiece housing for a surgical drill, reamer, sagittal saw, or the like.
Pitzen James F. (Maplewood MN) Smith Jeffrey D. (Marine on St. Croix MN) Alexson Charles E. (River Falls WI) Fenske Lawrence (Madison WI), Orthopedic surgical instrument.
Wahl Karl I. (EkerSEX) Lindstrm Lars G. (Sundbyberg SEX), Plaster cutting wire, plaster cast or dressing comprising such wire and method of manufacturing such a plaster cast or d.
Carusillo Steven J. (Kalamazoo MI) Robertson Ralph S. (Delton MI) Izenbaard John (Vicksburg MI), Powered surgical handpiece incorporating sealed multi semiconductor motor control package.
Tubesing ; deceased William W. (1097 Sharonton Way late of Stone Mountain GA 30083) Tubesing ; executrix by Charlotte M. (1097 Sharonton Way Stone Mountain GA 30083), Saw drive tensioner.
Bertin Kim C. ; Booth ; Jr. Robert ; Burke Dennis W. ; Bays Rodney ; Dietz Terry L. ; Stalcup Gregory C. ; Vanlaningham Richard D., Tibial milling guide system.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.