Prosthetic device and method of fixation within the medullary cavity of bones

Claim 2

A prosthesis adapted for fixation within the medullary cavity of a human bone, said prosthesis comprising: (a) a rigid arbor adapted to fit within the medullary cavity of the bone, (b) locating means for selectively positioning the arbor within the medullary cavity, (c) a nonresorbable, flexible membrane encompassing said arbor and secured to said locating means in a liquid and air tight manner, said membrane being impervious and inert to human bodily fluids, (d) a flexible, woven sheath secured to said locating means and encompassing said arbor and membrane, and (e) means for introducing liquid cement under pressure internally of said flexible membrane.

Claim 3

A prosthesis adapted for fixation in the medullary cavity of a human bone as set forth in claim 1 wherein said arbor is shaped to generally conform to the shape of the medullary cavity.

Claim 4

A prosthesis adapted for fixation within the medullary cavity of a human bone as set forth in claim 2 wherein said locating means comprise a lockable collar selectively positioned on said arbor.

Claim 5

A prosthesis adapted for fixation within the medullary cavity of a human bone as set forth in claim 3 wherein said collar has a passageway communicating the periphery of the collar with the interior of the flexible membrane whereby liquid cement under pressure may be introduced into said membrane.

Claim 6

A prosthesis adapted for fixation within the medullary cavity of a human bone as set forth in claim 4 wherein said flexible sheath comprises finely woven metallic threads.

Claim 7

A prosthesis adapted for fixation within the medullary cavity of a human bone femur bone, said prosthesis comprising: (a) a rigid arbor adapted to fit within the proximal end of the medullary cavity of a femur bone, said arbor being generally shaped to conform to the shape of medullary cavity and having a straight section of uniform diameter, (b) an annular, lockable collar selectively positioned on said straight section having an inner surface for engagement with the femoral bone so as to position said arbor in the medullary cavity, (c) a nonresorbable, flexible membrane encompassing said arbor and secured to the collar in a liquid and air tight manner, said membrane being impervious and inert to human bodily fluids, (d) a flexible, metallic woven sheath secured to said collar and encompassing said arbor and flexible membrane, (e) means for introducing liquid cement under pressure internally of said flexible membrane.

Claim 8

A prosthesis adapted for fixation within the medullary cavity of a human bone femur bone, said prosthesis comprising: (a) a rigid arbor adapted to fit within the proximal end of the medullary cavity of a femur bone, said arbor being generally shaped to conform to the shape of medullary cavity and having a straight section of uniform diameter, (b) an annular, lockable collar selectively positioned on said straight section having an inner surface for engagement with the femoral bone so as to position said arbor in the medullary cavity, (c) a nonresorbable, flexible membrane encompassing said arbor and secured to the collar in a liquid and air tight manner, said membrane being impervious and inert to human bodily fluids, (d) a flexible, metallic woven sheath secured to said collar and encompassing said arbor and flexible membrane, (e) means for introducing liquid cement under pressure internally of said flexible membrane.

Claim 11

A method of fixing a prosthesis within the medullary cavity of a human bone as set forth in claim 7 wherein said flexible membrane is impervious and inert to human bodily fluids.

Claim 12

A method of fixing a prosthesis within the medullary cavity of a human bone as set forth in claim 8 wherein the depth of penetration of the arbor, membrane and sheath into the medullary cavity is selectively controlled according to the size of said cavity.

Claim 13

A prosthesis adapted for fixation within the medullary cavity of a human bone, said prosthesis comprising: (a) an orthopedic device adapted for insertion into the medullary cavity of a human bone, (b) a nonresorbable, flexible membrane secured to said orthopedic device in a liquid and air tight manner, said membrane being impervious and inert to human bodily fluids, (c) a flexible woven sheath secured to said orthopedic device and encompassing said membrane, and (d) means for introducing liquid cement under pressure internally of said flexible membrane.

Claim 14

A prosthesis adapted for fixation within the medullary cavity of a human bone, said prosthesis comprising: (a) an orthopedic device adapted for insertion into the medullary cavity of a human bone, (b) a nonresorbable, flexible membrane secured to said orthopedic device in a liquid and air tight manner, said membrane being impervious and inert to human bodily fluids, (c) a flexible woven sheath secured to said orthopedic device and encompassing said membrane, and (d) means for introducing liquid cement under pressure internally of said flexible membrane.

Claim 15

A prosthesis adapted for fixation within the medullary cavity of a human bone as set forth in claim 10 wherein said flexible membrane at least partially encompasses said orthopedic device.

Claim 16

A prosthesis adapted for fixation within the medullary cavity of a human bone as set forth in claim 11 wherein said orthopedic device has at least one passageway communicating the outer face of the device with the interior of the flexible membrane whereby liquid cement may be introduced internally of said membrane.

Claim 17

A prosthesis adapted for fixation within the hip acetabular cavity, said prosthesis comprising: (a) an acetabular cup generally shaped to fit within the acetabular cavity, (b) a nonresorbable, flexible membrane secured to the acetabular cup in a liquid and air tight manner, said membrane being impervious and inert to human bodily fluids, (c) a flexible woven sheath secured to said acetabular cup and encompassing said membrane, and (d) means for introducing liquid cement under pressure internally of said membrane.

Claim 18

A prosthesis adapted for fixation within the hip acetabular cavity, said prosthesis comprising: (a) an acetabular cup generally shaped to fit within the acetabular cavity, (b) a nonresorbable, flexible membrane secured to the acetabular cup in a liquid and air tight manner, said membrane being impervious and inert to human bodily fluids, (c) a flexible woven sheath secured to said acetabular cup and encompassing said membrane, and (d) means for introducing liquid cement under pressure internally of said membrane.

Claim 19

A prosthesis adapted for fixation within the hip acetabular cavity as set forth in claim 13 wherein said acetabular cup has at least one passageway communicating the outer face of said cup with the interior of said membrane.

Claim 20

A prosthesis adapted for fixation within the hip acetabular cavity as set forth in claim 14 wherein said membrane and sheath are formed into two separate chambers.

Claim 21

A prosthesis adapted for fixation within the hip acetabular cavity as set forth in claim 15 wherein said acetabular cup has passageways communicating the outer face of said cup with each chamber of said membrane.

Claim 24

A method of fixing a prosthesis within a human bony cavity as set forth in claim 17 wherein said membrane and said sheath are divided into two separate chambers with one chamber disposed adjacent the outer edge of the bony cavity and said one chamber is filled with liquid cement under pressure and the cement is allowed to harden before the other of said chambers is filled with liquid cement.