Patent US5574075A successfully refreshed from Google Patents.
US5574075A
Expired / Lapsed
US
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Material as a starting material for the preparation of bone cement, process for its preparation and process for the preparation of bone cement
Assignee: Individual
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Filing: 1991-10-21
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Granted: 1996-11-12
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Expires: 2011-10-21
Abstract
Abstract The invention relates to a material in the form of a three-dimensional conglomerate of polymer particles which is used as a starting material for the preparation of bone cement. The conglomerate is a solid with a uniform pore system and is prepared by bonding the polymer particles to one another at their points of contact or connecting them at their surfaces. After addition of the monomer the material is prepared to a self-curing bone cement and mixed.
Inventors
- 👤 Klaus Draenert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:12
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/8802; A61B17/8833; A61F; A61F2/00; A61F2/02; A61F2/28; A61L; A61L24/00; A61L24/04; A61L24/06; C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; A61L2430/00; A61L2430/02
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
37 words
A bone cement polymer component as a starting material for preparing bone cement, wherein the polymer component comprises a three-dimensional conglomerate of polymer particles and wherein the polymer component is a solid and contains a pore system.
Claim 2
Dependent Claim
37 words
A bone cement polymer component as a starting material for preparing bone cement, wherein the polymer component comprises a three-dimensional conglomerate of polymer particles and wherein the polymer component is a solid and contains a pore system.
Claim 3
Dependent Claim
15 words
The bone cement polymer component according to claim 1, wherein the pore system is uniform.
Claim 4
Dependent Claim
36 words
The bone cement polymer component according to claim 1, wherein the polymer particles are selected from the group consisting of prepolymers of polyacrylates or polymethacrylates, a copolymer of an acrylate and a methacrylate and mixtures thereof.
Claim 5
Dependent Claim
19 words
The bone cement polymer component according to claim 1, wherein the conglomerate is packed or welded in evacuated state.
Claim 6
Dependent Claim
17 words
The bone cement polymer component according to claim 4, wherein the conglomerate is evacuated in a vessel.
Claim 7
Dependent Claim
29 words
The bone cement polymer component according to claim 1, wherein the conglomerate additionally contains filler particles in a form selected from the group consisting of spheres, granules and threads.
Claim 8
Dependent Claim
20 words
The bone cement polymer component according to claim 6, wherein the filler particles are radiographic contrast agents or bone-inducing particles.
Claim 9
Dependent Claim
21 words
The bone cement polymer component according to claim 6, wherein the filler particles are between 50 and 300 μm in size.
Claim 10
Dependent Claim
21 words
The bone cement polymer component according to claim 1, wherein the polymer particles are pressed into a conglomerate in tablet form.
Claim 11
Dependent Claim
23 words
The bone cement polymer component according to claim 1, wherein cavities in the form of a canal system are provided in the conglomerate.
Claim 12
Dependent Claim
26 words
The bone cement polymer component according to claim 1, wherein the polymer particles in the conglomerate are bonded to one another at their points of contact.
Claim 13
Dependent Claim
61 words
A process for preparing a bone cement polymer component comprising: providing powdered polymer particles: and heating the powdered polymer particles at temperatures between 70° and 120° C. such the polymer particles are bonded to one another at their points of contact and converted into a three-dimensional conglomerate of polymer particles wherein the conglomerate is a solid and contains a pore system.
Claim 14
Dependent Claim
61 words
A process for preparing a bone cement polymer component comprising: providing powdered polymer particles: and heating the powdered polymer particles at temperatures between 70° and 120° C. such the polymer particles are bonded to one another at their points of contact and converted into a three-dimensional conglomerate of polymer particles wherein the conglomerate is a solid and contains a pore system.
Claim 15
Dependent Claim
52 words
A process for preparing a bone cement polymer component comprising: providing powdered polymer particles; and pressurizing the polymer particles such that the polymer particles are connected to one another at their surfaces and converted into a three-dimensional conglomerate of polymer particles wherein the conglomerate is a solid and contains a pore system.
Claim 16
Dependent Claim
52 words
A process for preparing a bone cement polymer component comprising: providing powdered polymer particles; and pressurizing the polymer particles such that the polymer particles are connected to one another at their surfaces and converted into a three-dimensional conglomerate of polymer particles wherein the conglomerate is a solid and contains a pore system.
Claim 17
Dependent Claim
50 words
A process for preparing a bone cement polymer component comprising: providing powdered polymer particles; and applying heat between 50° and 150° C.: applying simultaneously with the heat pressurization between 1 and 10 bar, such that the powdered polymer particles are solidified into a three-dimensional solid conglomerate having a pore system.
Claim 18
Dependent Claim
50 words
A process for preparing a bone cement polymer component comprising: providing powdered polymer particles; and applying heat between 50° and 150° C.: applying simultaneously with the heat pressurization between 1 and 10 bar, such that the powdered polymer particles are solidified into a three-dimensional solid conglomerate having a pore system.
Claim 19
Dependent Claim
39 words
A process for preparing a bone cement polymer component comprising: providing powdered polymer particles; and chemically treating the polymer particles to form a solid in the form of a three-dimensional, solid conglomerate of polymer particles containing a pore system.
Claim 20
Dependent Claim
39 words
A process for preparing a bone cement polymer component comprising: providing powdered polymer particles; and chemically treating the polymer particles to form a solid in the form of a three-dimensional, solid conglomerate of polymer particles containing a pore system.
Claim 21
Dependent Claim
32 words
The process according to claim 15, wherein a solvent is passed through the powder of the polymer particles under vacuum, whereby the polymer particles adhere to one another and form the conglomerate.
Claim 22
Dependent Claim
14 words
The process according to claim 16, wherein acetone vapors are used as the solvent.
Claim 23
Dependent Claim
28 words
The process according to claim 13, wherein a press mold is used for pressurization which is designed such that a canal system is provided in the formed conglomerate.
Claim 24
Dependent Claim
28 words
The process according to claim 18, wherein the press mold is cylindrical and comprises several means in its interior which serve as space retainers for the canal system.
Claim 25
Dependent Claim
26 words
The bone cement polymer component according to claim 1, wherein the polymer component is prepared and mixed into a self-curing bone cement by adding a monomer.
Claim 26
Dependent Claim
30 words
A process for preparing bone cement comprising: converting polymer particles into a conglomerate in the form of a solid comprising a pore system; and adding a monomer to the conglomerate.
Claim 27
Dependent Claim
30 words
A process for preparing bone cement comprising: converting polymer particles into a conglomerate in the form of a solid comprising a pore system; and adding a monomer to the conglomerate.
Claim 28
Dependent Claim
17 words
The bone cement polymer component according to claim 4, wherein the conglomerate is welded under vacuum pressure.
Claim 29
Dependent Claim
31 words
The bone cement polymer component according to claim 4, wherein the conglomerate is welded under vacuum pressure within a packing material, said, packing material being made of an airtight PMMA film.
Claim 30
Dependent Claim
22 words
The bone cement polymer component according to claim 6, wherein the filler particles have a thread length between 0.5 and 5 mm.
Claim 31
Dependent Claim
21 words
The bone cement polymer component according to claim 6, wherein the filler particles have a thread length up to 3.5 mm.
Claim 32
Dependent Claim
24 words
The bone cement polymer component according to claim 1, wherein the polymer particles in the conglomerate are connected to one another at their surfaces.
Claim 33
Dependent Claim
16 words
The process according to claim 14, wherein the heat is applied between 70° and 100° C.
Claim 34
Dependent Claim
17 words
The process according to claim 14, wherein the pressure is applied at between 3 to 5 bar.
Claim 35
Dependent Claim
15 words
The process according to claim 14, wherein the pressure is applied at approximately 5 bar.
Claim 36
Dependent Claim
20 words
The process according to claim 18, wherein the means which serve as spore retainers for the canal system includes pins.
Claim 37
Dependent Claim
16 words
The process of claim 21 further comprising the step of mixing the monomer with the conglomerate.
Claim 38
Dependent Claim
10 words
Bone cement made according to the process of claim 21.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-12 | 2000-05-13 | 2000-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-12 | 2004-05-13 | 2004-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-12 | 2008-05-13 | 2008-11-12 | $7700.00 | Window Closed / Lapsed |