Osteoinductive bone material
First Claim
1. An osteoinductive powder comprising:
- (a) demineralized bone matrix (DBM) in an amount in the range of 40 to 70 wt %, wherein said DBM comprises particles having a particle size in the range of about 53 μ
m to about 850 μ
m, and(b) a calcium phosphate powder in an amount in the range of about 25 to about 60 wt %,wherein said osteoinductive powder forms a formable, self-hardening, poorly crystalline apatitic (PCA) calcium phosphate paste when admixed with a physiologically acceptable liquid, and wherein said paste is capable of hardening to form a PCA calcium phosphate having a compressive strength of greater than at least about 1 MPa.
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Abstract
Osteogenic bone implant compositions that approximate the chemical composition of natural bone are provided. The organic component of these implant compositions is osteoinductive despite the presence of the inorganic component and, further, is present in an amount sufficient to maximize the regenerative capabilities of the implant without compromising its formability and mechanical strength. The composition may be an osteoinductive powder, including demineralized bone matrix (DBM) particles, a calcium phosphate powder, and, optionally, a biocompatible cohesiveness agent. The powder may be combined with a physiologically-acceptable fluid to produce a formable, osteoinductive paste that self-hardens to form a poorly crystalline apatitic (PCA) calcium phosphate having significant compressive strength. The bone implant materials retain their cohesiveness when introduced at an implant site and are remodeled into bone in vivo. Methods for using these implant materials to repair damaged bone and a method of assaying the content of DBM particles, by weight, in a bone implant material are also provided.
162 Citations
94 Claims
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1. An osteoinductive powder comprising:
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(a) demineralized bone matrix (DBM) in an amount in the range of 40 to 70 wt %, wherein said DBM comprises particles having a particle size in the range of about 53 μ
m to about 850 μ
m, and(b) a calcium phosphate powder in an amount in the range of about 25 to about 60 wt %, wherein said osteoinductive powder forms a formable, self-hardening, poorly crystalline apatitic (PCA) calcium phosphate paste when admixed with a physiologically acceptable liquid, and wherein said paste is capable of hardening to form a PCA calcium phosphate having a compressive strength of greater than at least about 1 MPa. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 72, 73, 83, 84)
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32. An osteoinductive powder comprising:
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(a) demineralized bone matrix (DBM) in an amount in the range of 40 to 70 wt %, wherein said DBM comprises particles having a particle size in the range of about 53 μ
m to about 850 μ
m;(b) a calcium phosphate powder in an amount in the range of about 25 to about 60 wt %; and (c) a biocompatible cohesiveness agent in an amount in the range of about 0.5 to 20 wt %; wherein said osteoinductive powder forms a formable, self-hardening, poorly crystalline apatitic (PCA) calcium phosphate paste when admixed with a physiologically acceptable liquid, and wherein said paste is capable of hardening to form a PCA calcium phosphate having a compressive strength of greater than at least about 1 MPa. - View Dependent Claims (74, 75, 85, 86)
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33. A formable, self-hardening, poorly crystalline apatitic (PCA) calcium phosphate paste suitable for use as a bone implant material comprising:
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(a) a powder component comprising; (i) demineralized bone matrix (DBM) in an amount in the range of 40 to 70 wt %, wherein said DBM comprises particles having a particle size in the range of about 53 μ
m to about 850 μ
m, and(ii) a calcium phosphate powder in an amount in the range of about 25 to about 60 wt %; and (b) a physiologically-acceptable fluid in an amount to produce a cohesive, formable paste, wherein said paste retains its cohesiveness when introduced at an implant site in vivo and hardens to form a PCA calcium phosphate having a compressive strength of greater than at least about 1 MPa. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 71, 76, 77, 82, 87, 88)
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67. A formable, self-hardening, poorly crystalline apatitic (PCA) calcium phosphate paste suitable for use as a bone implant material comprising:
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(a) a powder component, including; (i) demineralized bone matrix (DBM) in an amount in the range of 40 to 70 wt %, wherein said DBM comprises particles having a particle size in the range of about 53 μ
m to about 850 μ
m,(ii) a calcium phosphate powder in an amount in the range of about 25 to about 60 wt %, and (iii) a biocompatible cohesiveness agent in an amount in the range of about 0.5 to 20 wt %; and (b) a physiologically acceptable fluid in an amount to produce a cohesive, formable paste, wherein said paste retains its cohesiveness when introduced at an implant site in vivo and hardens to form a PCA calcium phosphate having a compressive strength of greater than at least about 1 MPa. - View Dependent Claims (78, 79, 89, 90)
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68. A formable, self-hardening, poorly crystalline apatitic (PCA) calcium phosphate paste suitable for use as a bone implant material comprising:
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(a) a powder component, comprising; (i) demineralized bone matrix (DBM) in an amount in the range of 40 wt % to 70 wt % of said powder component, wherein said DBM comprises particles having a particle size in the range of about 53 μ
m to about 850 μ
m, and(ii) a calcium phosphate powder in an amount in the range of about 25 wt % to about 60 wt % of said powder component, wherein said calcium phosphate powder comprises an amorphous calcium phosphate and a second calcium phosphate having an average crystalline domain size of less than about 100 nm, and (b) a physiologically acceptable fluid in an amount to produce a coherent, formable paste, wherein said paste retains its cohesiveness when introduced at an implant site in vivo and hardens to form a poorly crystalline apatitic (PCA) calcium phosphate having a compressive strength between about 1 MPa and about 20 MPa. - View Dependent Claims (69, 80, 91, 92)
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70. A bone implant material comprising a poorly crystalline apatitic (PCA) calcium phosphate, wherein said PCA calcium phosphate is formed by combining:
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(a) a powder component comprising; (i) demineralized bone matrix (DBM) in an amount in the range of 40 wt % to 70 wt % of said powder component, wherein said DBM comprises particles having a particle size in the range of about 53 μ
m to about 850 μ
m,(ii) a calcium phosphate powder comprising an amorphous calcium phosphate and a second calcium phosphate source, wherein said second calcium phosphate source is an acidic calcium phosphate, and (iii) a biocompatible cohesiveness agent; and (b) a physiologically-acceptable fluid, wherein said powder component and said liquid combine to produce a paste that hardens to form a PCA calcium phosphate having a compressive strength between about 1 MPa and about 20 MPa. - View Dependent Claims (81, 93, 94)
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Specification