US 5,468,245 AGranted

Biomedical cement bonding enhancer

OwnerJoseph H. Vargas, IIIinventor

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Abstract

A method and apparatus for filling a shaft bored into human femoral bone during hip replacement surgery with gelatinous methyl methacrylate bonding cement for receipt of an artificial hip prothesis so as to maximally preventing loosening of the prosthesis after hardening of the cement consisting of a cylindrically shaped syringe gun unit screwed into a cylindrically shaped hollow head of a hollow cylindrical applicator tube to the exterior of which applicator tube near its tip there is affixed an inflatable balloon amenable to receipt of fluid by way of tubing passing through a distinct lumen of said applicator tube which said tubing is attached at one end to a hollow canal in the applicator tube leading via the lumen to the balloon and attached at its other end to a valvular component in turn attached to the cylindrical base of a second syringe gun unit which said apparatus serves to facilitate injection of such cement incrementally into relatively air tight spaces within such shaft formed in view of the inflatibility of such balloon until such shaft is completely filled with such cement.

Claims11

Dependent claims

A biomedical cement bonding enhancer, comprising:

a) a first hollow syringe body containing gelatinous cement;
b) a plunger fitted to said first hollow syringe body;
c) an opening at the base of said first hollow syringe body;
d) a hollow extension of said opening circumscribed by screw threading means permanently affixed to the base of said first hollow syringe body;
e) a long, hollow, rigid tube with a first open end and a second open end;
f) a hollow cap containing threading about the interior walling of said cap which said cap is permanently affixed to said first open end of said long, hollow, rigid tube which said threading serves to receive said screw threading means;
g) inflatable material with two open ends in the shape of a hollow cylinder permanently affixed at each of said two open ends of said inflatable material to that portion of the exterior surface of said long, hollow, rigid tube in proximity to said second open end of said long, hollow, rigid tube such that said inflatable material completely circumscribes said portion of the said exterior surface of said long, hollow, rigid tube;
h) a second hollow syringe body;
i) an opening at the base of said second hollow syringe body;
j) a plunger fitted to said second hollow syringe body;
k) a hollow extension of said opening at the base of said second hollow syringe body which said hollow extension is permanently affixed to said base of said second hollow syringe body;
l) a hollow valve unit fitted at a first end to said hollow extension of said opening at the base of said second hollow syringe body;
m) a piece of flexible tubing;
n) a hollow connector connecting a first end of said piece of flexible tubing to the second end of said hollow valve unit;
o) an open portal with walling which said open portal is molded to the exterior surface of said long, hollow, rigid tube;
p) an enclosed hollow canal encased by the said walling of said open portal leading from a first hole cut through the wall of said long, hollow, rigid tube to a point in the proximity of the opening of said open portal which said enclosed hollow canal serves to receive the second end of said piece of flexible tubing;
q) a second enclosed hollow canal leading from said first hole cut through the wall of said long, hollow, rigid tube and running along the interior surface of said long, hollow, rigid tube to a second hole in the said wall of said long, hollow, rigid tube which said second hole is located within that portion of said wall circumscribed totally by said inflatable material.

14 more elements

A method for applying bonding cement to a shaft bored into a human femur for the purpose of anchoring an artificial hip prosthesis, comprising the steps of:

a) fitting a restrictor cap snug into the bottom of said shaft;
b) permanently affixing both ends of an inflatable material in the shape of a hollow cylinder to the exterior surface of a long, hollow, rigid tube with a first open end and a second open end near said first open end of said long, hollow, rigid tube;
c) connecting said second open end of said long, hollow, rigid tube to a raised opening in the base of the body of a first hollow syringe unit;
d) connecting a valve in the exterior surface of said inflatable material to a first of two open ends of flexible hollow tubing;
e) connecting a second of said two open ends of said flexible hollow tubing to a hollow connector;
f) connecting said hollow connector to a raised opening in the base of a second hollow syringe unit;
g) filling said first hollow syringe unit with bonding cement;
h) filling said second hollow syringe unit with a fluid;
i) inserting said first open end of said long, hollow, rigid tube into said bored shaft in proximity to said restrictor cap;
j) placing a fluid pushing plunger into said second hollow syringe unit;
k) forcing with downward pressure on said fluid pushing plunger said fluid via said flexible hollow tubing into said inflatable material and inflating said inflatable material until the said inflatable material in a fully inflated state completely presses everywhere very tightly against the bony walling of said bored shaft;
l) placing a bonding cement pushing plunger into said first hollow syringe unit;
m) forcing with downward pressure on said bonding cement pushing plunger, a quantity of said bonding cement into a first closed space within said bored shaft between said inflatable material in said fully inflated state and said restrictor cap via said long, hollow, rigid tube;
n) drawing back on said fluid pushing plunger so as to slightly deflate said inflatable material;
o) withdrawing said first end of said long, hollow, rigid tube a short distance from its location within said bored shaft when said bonding cement was last injected into said first closed space;
p) pushing down again on said fluid pushing plunger so as to once again inflate said inflatable material to the extent that said inflatable material in said fully inflated state completely presses everywhere very tightly against the bony walling of said shaft;
q) forcing with downward pressure on said bonding cement pushing plunger a quantity of said bonding cement into a new closed space within said bored shaft between said inflatable material in said fully inflated space and the top surface of said last injected bonding cement;
r) repeating steps k, l, m, n, o, p, and q successively until said bored shaft is completely filled with said bonding cement;
s) repeating steps n, o, p and q successively until said bored shaft is completely filled with said bonding cement.

16 more elements

A method for applying bonding cement to a shaft bored into a human femur for the purpose of anchoring an artificial hip prothesis comprising the steps of:

a) fitting a restrictor cap snug into the bottom of said shaft;
b) permanently affixing both ends of an inflatable material in the shape of a hollow cylinder to a first portion of the exterior surface of a long, hollow, rigid, bicannulated tube with a first open end and a second open end near said first open end of said long, hollow, rigid bicannulated tube and completely circumscribing with said permanently affixed inflatable material said first portion of said exterior surface after first cutting a first hole into said first portion of said long, hollow, rigid bicannulated tube as is completely circumscribed externally by said permanently affixed inflatable material and circumscribed internally by the enclosing walling of one of the two canals within said long, hollow, rigid bicannulated tube;
c) sealing at said first open end of and in proximity to mid second open end of said long, hollow, rigid, bicannulated tube a first canal of said long, hollow, rigid, bicannulated tube, the external walling of which said first canal contains said first hole;
d) cutting a second hole into the portion of said exterior surface of said long, hollow, rigid, bicannulated tube further from said first end of said long, hollow, rigid, bicannulated tube than the end of said inflatable material that is the farthest of said both ends of said inflatable material from said first end of said long, hollow, rigid, bicannulated tube which said second hole leads directly into said first canal;
e) connecting said second open end of said long, hollow, rigid, bicannulated tube to a raised opening in the base of the body of a first hollow syringe unit;
f) connecting a first of two open ends of flexible hollow tubing to the whole boundary of said second hole;
g) connecting a second of said two open ends of said flexible hollowing tubing to a hollow connector;
h) connecting said hollow connector to a raised opening in the base of a second hollow syringe unit;
i) filling said first hollow syringe unit with bonding cement;
j) filling said second hollow syringe unit with a fluid;
k) inserting said first end of said long, hollow, rigid tube into said bored shaft in proximity to said restrictor cap;
l) placing a fluid pushing plunger into said second hollow syringe unit;
m) forcing with downward pressure on said fluid pushing plunger said fluid via said flexible hollow tubing into said inflatable material and inflating said inflatable material until said inflatable material in a fully inflated state completely presses everywhere very tightly against the bony walling of said bored shaft;
n) placing a bonding cement pushing plunger into said first hollow syringe unit;
o) forcing with downward pressure on said bonding cement pushing plunger a quantity of bonding cement into a first closed space within said bored shaft between said inflatable material in said fully inflated state and said restrictor cap via said long, hollow, rigid tube;
p) drawing back on said fluid pushing plunger so as to slightly deflate said inflatable material;
q) withdrawing said first end of said long, hollow, rigid tube a short distance from its location within said bored shaft when said bonding cement was last injected into said first closed space;
r) pushing down again on said fluid pushing plunger so as to once again inflate said inflatable material to the extent that said inflatable material in said fully inflated state completely presses everywhere very tightly against the bony walling of said shaft;
s) forcing with downward pressure on said bonding cement pushing plunger a quantity of said bonding cement into a new closed space within said bored shaft between said inflatable material in said fully inflated space and the top surface of said last injected bonding cement;
t) repeating steps m, o, p, q, r, and s successively until said bored shaft is completely filled with said bonding cement
u) repeating steps p, q, r and s successively until said bored shaft is completely filled with said bonding cement.

18 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/191,105Filed 3 Feb 1994
Granted: 21 Nov 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

A61F 2/4657
Special tools for implanting artificial joints: measuring instruments used for implanting artificial joints
A61B 17/8808
For introducing fluid filler into bone or extracting it: with sealing collar for bone cavity
A61B 17/8811
For introducing fluid filler into bone or extracting it: characterised by the introducer tip, i.e. the part inserted into or onto the bone
A61B 2090/062
Measuring instruments not otherwise provided for: penetration depth