Base material for tissue reconstruction, implantable material, and methods of preparing the same
First Claim
1. A base material for tissue reconstruction that is mainly composed of either one of a polyrotaxane and a polyrotaxane hydrogel, where the polyrotaxane has biocompatible groups, each of which has a bulky substituent and is introduced via a hydrolytic bond to either terminal of a linear molecule with multiple cyclic molecules threaded thereon, and the polyrotaxane hydrogel has a network structure formed by crosslinking between the cyclic molecules, between the biocompatible groups, or between the cyclic molecule and the biocompatible group in adjoining molecules of the polyrotaxane.
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Abstract
Base materials for tissue regeneration which enable the tissue regeneration, have mechanical properties needed in the tissue regeneration and can disappear via degradation in vivo after the completion of the tissue regeneration; and implantable materials with the use of the same. The above-described base materials for tissue regeneration comprise polyrotaxane, wherein biocompatible groups having bulky substituents have been introduced via hydrolyzable bond into both ends of a linear molecule penetrating plural cyclic molecules, or a polyrotaxane hydrogel having a network structure formed by crosslinking the cyclic molecules to each other, the biocompatible groups to each other, or the cyclic molecules to the biocompatible groups in each polyrotaxane molecule.
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Citations
16 Claims
- 1. A base material for tissue reconstruction that is mainly composed of either one of a polyrotaxane and a polyrotaxane hydrogel, where the polyrotaxane has biocompatible groups, each of which has a bulky substituent and is introduced via a hydrolytic bond to either terminal of a linear molecule with multiple cyclic molecules threaded thereon, and the polyrotaxane hydrogel has a network structure formed by crosslinking between the cyclic molecules, between the biocompatible groups, or between the cyclic molecule and the biocompatible group in adjoining molecules of the polyrotaxane.
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11. A base material for tissue reconstruction that is mainly composed of a polyrotaxane hydrogel and has characteristics (a) below, the polyrotaxane hydrogel having a network structure formed by crosslinking of cyclic molecules in adjoining molecules of a polyrotaxane via a crosslinking linear molecule, where the polyrotaxane has biocompatible groups, each of which has a bulky substituent and is introduced via a hydrolytic bond to either terminal of a linear molecule with multiple cyclic molecules threaded thereon:
(a) wherein a time for complete hydrolysis of the polyrotaxane hydrogel does not depend upon a water content in the polyrotaxane hydrogel, but is extended with any of a decrease in polyrotaxane content in the polyrotaxane hydrogel, an increase in molar ratio of the crosslinking linear molecule to the cyclic molecule, and a decrease in average molecular weight of the crosslinking linear molecule. - View Dependent Claims (13)
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12. A base material for tissue reconstruction that is mainly composed of a polyrotaxane hydrogel and has characteristics (b) below, the polyrotaxane hydrogel having a network structure formed by crosslinking of cyclic molecules in adjoining molecules of a polyrotaxane via a crosslinking linear molecule, where the polyrotaxane has biocompatible groups, each of which has a bulky substituent and is introduced via a hydrolytic bond to either terminal of a linear molecule with multiple cyclic molecules threaded thereon:
(b) wherein a decomposition pattern shown by a graph with t/t∞
as abscissa and Mt/M0 as ordinate does not depend upon a content of the polyrotaxane in the polyrotaxane hydrogel but depends upon a molecular weight of the crosslinking linear molecule, where t∞
denotes a time for complete hydrolysis of the polyrotaxane hydrogel, t denotes a time elapsed since soaking of the polyrotaxane hydrogel in water, M0 denotes an initial weight of the polyrotaxane hydrogel in a water-swelling state, and Mt denotes a weight of the polyrotaxane hydrogel at the time t.
Specification