Method and apparatus for preparing a self-curing two component powder/liquid cement
First Claim
1. A method of preparing a self-curing cement from a powder component containing a polymerization catalyst and a liquid component containing a polymerizable monomer, comonomer, prepolymer or mixtures thereof, said method comprising:
- A. supplying said powder component in an at least partially evacuated, sealed chamber of a first inflexible container, said powder component comprising particles of said powder and interspaces therebetween;
B. supplying said liquid component in a second inflexible container;
C. connecting said second container to said first container by means of an air-tight connection;
D. pressurizing said liquid component to a pressure higher than that of said partially evacuated chamber; and
E. propelling said liquid component into said partially evacuated container, whereby said liquid floods said partially evacuated interspaces by the action of the pressure difference between the pressure on the liquid component and the pressure in the interspaces, thereby forming a polymerizable cement mass.
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Accused Products
Abstract
A method of preparing a self-curing two-component cement, which is particularly useful for the preparation of bone cement used in orthopedics, from a powder component and a liquid component. The method includes providing the powder component in a first at least partially evacuated inflexible container, providing the liquid component in a second inflexible container, and adding the liquid component to the evacuated powder component, such that the liquid floods the evacuated interspaces between the powder particles. An apparatus for carrying out this process is a syringe with a slidable piston, the syringe being sealed at its dispensing end by a removable plug. Preferably, the syringe is fitted with an axially collapsible spiral mixing device, one end of which is an elongated shaft which extends through the removable plug at the dispensing end. The elongated shaft can be rotated to homogenize the contents of the syringe, but during dispensing the mixing device collapses as the piston advances.
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Citations
14 Claims
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1. A method of preparing a self-curing cement from a powder component containing a polymerization catalyst and a liquid component containing a polymerizable monomer, comonomer, prepolymer or mixtures thereof, said method comprising:
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A. supplying said powder component in an at least partially evacuated, sealed chamber of a first inflexible container, said powder component comprising particles of said powder and interspaces therebetween; B. supplying said liquid component in a second inflexible container; C. connecting said second container to said first container by means of an air-tight connection; D. pressurizing said liquid component to a pressure higher than that of said partially evacuated chamber; and E. propelling said liquid component into said partially evacuated container, whereby said liquid floods said partially evacuated interspaces by the action of the pressure difference between the pressure on the liquid component and the pressure in the interspaces, thereby forming a polymerizable cement mass. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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3. The method of claim 15 further comprising mechanically mixing said polymerizable cement mass, said mechanical mixing step comprising:
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providing said syringe with an axially collapsible, rotatable, spiral mixing member disposed in said chamber with one end of said spiral member being elongated and extending through said closure means; and rotating said elongated end of said mixing member, thereby rotating the spiral portion of said mixing member disposed in said chamber. - View Dependent Claims (4)
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Specification