Prosthetic leg with a hydraulic knee control
First Claim
4. A FLUID CHAMBER KNEE CONTROL DEVICE FOR A LEG PROSTHESIS COMPRISING A TUBULAR MEMBER CLOSED AT ONE END, A PISTON ROD BEARING IN THE OTHER END THROUGH WHICH A PISTON ROD PASSES, A FIXED PARTITION IN SAID TUBULAR MEMBER DIVIDING IT INTO AN UPPER AND A LOWER CYLINDER, SAID PARTITION HAVING A POPPET VALVE THERETHROUGH, AN ORIFICE CONNECTING SAID UPPER AND LOWER CYLINDERS, A FLOATING PISTON IN SAID UPPER CYLINDER, A PISTON IN SAID LOWER CYLINDER CONNECTED TO SAID PISTON ROD, SAID FLOATING PISTON DIVIDING SAID UPPER CYLINDER INTO AN UPPER AND A LOWER CHAMBER, THE OTHER SAID PISTON DIVIDING THE LOWER CYLINDER INTO AN UPPER AND A LOWER CHAMBER, MEANS TO PREVENT PASSAGE OF FLUID AROUND SAID FLOATING PISTON, MEANS TO PREVENT THE PASSAGE OF FLUID AROUND SAID OTHER PISTON, AN ORIFICE THROUGH SAID OTHER PISTON TO ALLOW CONTROLLED PASSAGE OF FLUID THERETHROUGH, AND AN ORIFICE THROUGH SAID POPPET VALVE TO ALLOW CONTROLLED PASSAGE OF FLUID THERETHROUGH.
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Accused Products
50 Citations
10 Claims
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4. A FLUID CHAMBER KNEE CONTROL DEVICE FOR A LEG PROSTHESIS COMPRISING A TUBULAR MEMBER CLOSED AT ONE END, A PISTON ROD BEARING IN THE OTHER END THROUGH WHICH A PISTON ROD PASSES, A FIXED PARTITION IN SAID TUBULAR MEMBER DIVIDING IT INTO AN UPPER AND A LOWER CYLINDER, SAID PARTITION HAVING A POPPET VALVE THERETHROUGH, AN ORIFICE CONNECTING SAID UPPER AND LOWER CYLINDERS, A FLOATING PISTON IN SAID UPPER CYLINDER, A PISTON IN SAID LOWER CYLINDER CONNECTED TO SAID PISTON ROD, SAID FLOATING PISTON DIVIDING SAID UPPER CYLINDER INTO AN UPPER AND A LOWER CHAMBER, THE OTHER SAID PISTON DIVIDING THE LOWER CYLINDER INTO AN UPPER AND A LOWER CHAMBER, MEANS TO PREVENT PASSAGE OF FLUID AROUND SAID FLOATING PISTON, MEANS TO PREVENT THE PASSAGE OF FLUID AROUND SAID OTHER PISTON, AN ORIFICE THROUGH SAID OTHER PISTON TO ALLOW CONTROLLED PASSAGE OF FLUID THERETHROUGH, AND AN ORIFICE THROUGH SAID POPPET VALVE TO ALLOW CONTROLLED PASSAGE OF FLUID THERETHROUGH.
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10. A LEG PROSTHESIS COMPRISING AN UPPER THIGH MEMBER, A LOWER SHANK MEMBER, A KNEE JOINT PIVOTALLY CONNECTING SAID MEMBERS, MEANS PIVOTALLY CONNECTED BETWEEN SAID MEMBERS FOR CONTROL OF SAID KNEE JOINT COMPRISING, A TUBULAR MEMBER SEALED AT EACH END, A PARTITION IN SAID TUBULAR MEMBER, AN UPPER CYLINDER AND A LOWER CYLINDER FORMED BY SAID PARTITION, HYDRAULIC FLUID IN BOTH SAID CYLINDERS, A VALVE MEANS JOINING SAID CYLINDERS, A NONVALVE MEANS ALLOWING CONTINUOUS FLUID COMMUNICATION BETWEEN SAID CYLINDERS, FLUID SPRING MEANS IN SAID UPPER CYLINDER, A PISTON IN SAID LOWER CYLINDER, AN UPPER CHAMBER AND A LOWER CHAMBER IN SAID LOWER CYLINDER FORMED BY SAID PISTON, AN ORIFICE JOINING SAID UPPER AND LOWER CHAM-
Specification
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Current AssigneeLa Vaughn L. Mortensen
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Original AssigneeLa Vaughn L. Mortensen
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InventorsMORTENSEN LA VAUGHN L
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Application NumberUS04/322,619Time in Patent Office1,267 DaysField of SearchUS Class Current623/26CPC Class CodesA61F 2/64 Knee jointsA61F 2/68 Operating or control meansA61F 2/74 fluid , i.e. hydraulic or p...
