Tissue substitute multilayer matrix and uses thereof
Compositions-of-matter comprising a matrix made of one or more, preferably two or more elastic layers and one or more viscoelastic layer are disclosed. The compositions-of-matter are characterized by high water-impermeability and optionally by self-recovery. Processes of preparing the compositions-of-matter and uses thereof as tissue substitutes or for repairing damaged tissues are also disclosed.
1. A composition-of-matter comprising a multi-layer matrix, said matrix comprising at least one layer of a viscoelastic polymeric material interposed between two or more layers of an elastic polymeric material, wherein:
each of said two or more layers of said elastic polymeric material is in a form of a porous layer of polymeric fibers;
said viscoelastic polymeric material is characterized by at least one of: (i) a glass transition temperature below 0° C., and (ii) a melting point at a temperature below 45° C.;
said polymeric fibers comprise poly(lactic acid-co-ε-caprolactone); and
said viscoelastic polymeric material comprises poly(lactic acid-co-ε-caprolactone).
2. The composition-of-matter of claim 1 , wherein each layer of said elastic polymeric material is a porous layer characterized by a porosity of at least 50%.
3. The composition-of-matter of claim 1 , wherein said polymeric fibers are characterized by a mean diameter in a range of from 0.5 to 10 μm.
4. The composition-of-matter of claim 1 , wherein said layer of a viscoelastic polymeric material is characterized by at least one of:
a) a storage shear modulus (G′) in a range of from 0.01 to 10 MPa, at a temperature of 10° C. and frequency of 0.1 Hz;
b) a loss shear modulus (G″) in a range of from 0.0001 to 2 MPa, at a temperature of 10° C. and frequency of 0.1 Hz; and
c) a loss tangent (G″/G′) at a temperature of 10° C. and frequency of 0.1 Hz which is in a range of from 0.01 to 4.
5. The composition-of-matter of claim 1 , wherein polymeric fibers comprise electrospun elastic polymeric material.
6. The composition-of-matter of claim 1 , wherein said layer of a viscoelastic polymeric material is characterized by a porosity in a range of from 0 to 50%.
7. The composition-of-matter of claim 1 , wherein said elastic polymeric material and said viscoelastic polymeric material are biocompatible.
8. The composition-of-matter of claim 1 , wherein said matrix is characterized by a thickness of between 0.06 and 1 mm.
9. The composition-of-matter of claim 1 , wherein each of said layers of an elastic polymeric material is characterized by an elastic modulus in a range of from 1 kPa to 10 MPa, as determined in accordance with ASTM international standard D882-12.
10. The composition-of-matter of claim 1 , wherein each of said layers of an elastic polymeric material is characterized by an elongation at failure of at least 100%.
11. The composition-of-matter of claim 1 , wherein each of said layers of an elastic polymeric material is characterized by an ultimate tensile strength (UTS) of at least 0.05 MPa, when measured according to ASTM international standard D882-12.
12. The composition-of-matter of claim 1 , wherein said matrix is characterized by an elastic modulus which is within a range of 80% to 120% of an elastic modulus of at least one of said elastic layers.
13. The composition-of-matter of claim 1 , wherein said matrix is characterized by UTS between above 4 MPa, when measured according to ASTM international standard D882-12.
14. The composition-of-matter of claim 1 , wherein said matrix is characterized by a water-permeability of less than 1 ml per hour per cm 2 upon exposure to an aqueous liquid at a pressure of 40 mmHg.
15. The composition-of-matter of claim 1 , further comprising at least one additional ingredient, said additional ingredient being in a form of an additional layer on at least a portion of at least one surface of said matrix and/or dispersed within and/or on at least one surface of said matrix, said at least one additional ingredient imparting an additional functionality.
16. The composition-of-matter of claim 1 , characterized by self-recovery upon suturing or stapling.
17. The composition-of-matter of claim 1 , wherein said matrix is characterized by elastic modulus of about 1 MPa, when measured according to ASTM international standard D882-12 at 100% strain.
18. An article-of-manufacture comprising the composition-of-matter of claim 1 , wherein the article-of-manufacture is a medical device.