BONE GRAFT SUBSTITUTE
First Claim
1. A porous implant mass composition for use in treating a defect in a living organism, comprising a plurality of biocompatible granules, at least a portion of the granules having surface indentations;
- wherein the individual granules have a specific surface area of less than 20 m2/g, and contain a network of interconnected pores, the interconnected pores within the granules having a homogeneous surface porosity defined by a diameter of at least 75% of the pores being between about 1 μ
m and about 10 μ
m between sintered grains as measured by mercury intrusion porosime-try, such that the single granules can withstand a mean compressive force of at least IN as measured with a universal testing machine.
2 Assignments
0 Petitions
Accused Products
Abstract
There is described a bone graft substitute which combines substantially the high mechanical stability of spherical porous granules without the limitation of reduced intergranular space. The structure inside the granules has a high porosity whilst maintaining high stability, so that the granules can be pushed into a defect without risking significant breakage of the granules and, at the same time, the bone cells can grow into the space between the granules. In an exemplary embodiment of the invention, the surface of the granules comprises indentations, when viewed from the exterior of the granules. An indentation increases the porosity within the implanted mass significantly and thus provides more space between the granules for tissue ingrowth. Due to the indentations on the granules, the granules have an irregular shape and thus an increase in the intergranular space is achieved, while mechanical stability is maintained.
4 Citations
22 Claims
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1. A porous implant mass composition for use in treating a defect in a living organism, comprising a plurality of biocompatible granules, at least a portion of the granules having surface indentations;
- wherein the individual granules have a specific surface area of less than 20 m2/g, and contain a network of interconnected pores, the interconnected pores within the granules having a homogeneous surface porosity defined by a diameter of at least 75% of the pores being between about 1 μ
m and about 10 μ
m between sintered grains as measured by mercury intrusion porosime-try, such that the single granules can withstand a mean compressive force of at least IN as measured with a universal testing machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- wherein the individual granules have a specific surface area of less than 20 m2/g, and contain a network of interconnected pores, the interconnected pores within the granules having a homogeneous surface porosity defined by a diameter of at least 75% of the pores being between about 1 μ
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13. A method of manufacturing a porous implant mass composition for use in treating a defect in a living organism, comprising a plurality of biocompatible granules wherein at least a portion of the granules have surface indentations, comprising:
- manufacturing granules and mixing the granules with a porogen;
pressing the porogen into the surface of at least a portion of the granules;
removing the porogen from the implant mass so that indentations in surface are obtained where the porogen is pressed into the granules. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
- manufacturing granules and mixing the granules with a porogen;
Specification