Implant assembly

1. An implant assembly comprising:

an implant configured to be transformable from a folded and contracted state to an expanded state by an introduced filling material, at least a portion of a surface thereof is covered with a covering material whose friction coefficient is configured to increase by coming into contact with a body fluid; and

guiding means for preventing the implant and the body fluid of a living body from coming into contact with each other inside the living body, and for guiding the implant to move to an indwelling position inside the living body;

wherein, when the implant is in the folded and contracted state, the covering material is covered by a folded portion of the implant and the implant has a first friction coefficient, and

wherein, when the implant is expanded to the expanded state, the covering material is exposed on an outer surface of the implant and the implant has a second friction coefficient, the second friction coefficient being greater than the first friction coefficient.

2. The implant assembly according to claim 1 ,

wherein a first surface portion which is exposed outward and a second surface portion, which is covered with the first surface portion so as to be positioned on an inner side of the first surface portion, are formed on a surface of the implant in the folded and contracted state, and

wherein the covering material covers only the second surface portion.

3. The implant assembly according to claim 1 ,

wherein the implant has a body section which extends in a longitudinal direction, and a wide section disposed at both ends of the body section and whose width in a direction intersecting the longitudinal direction is greater than the width of the body section in a state after the implant expands, and

wherein the covering material is disposed on only the wide section.

4. The implant assembly according to claim 1 ,

wherein the guiding means has a lumen into which the implant can be inserted, and friction reducing means for reducing friction between the lumen and the implant disposed on at least a portion of an inner surface of the guiding means which is formed by the lumen.

5. The implant assembly according to claim 4 ,

wherein the friction reducing means is configured so that the inner surface of the guiding means is formed in an uneven shape.

6. The implant assembly according to claim 5 ,

wherein the uneven shape includes a recessed groove and wherein an absorber which can absorb the body fluid is disposed inside a recessed groove formed on the inner surface of the guiding means.

7. The implant assembly according to claim 4 ,

wherein the friction reducing means is configured to include a low friction member which covers the inner surface of the guiding means.

8. The implant assembly according to claim 1 ,

wherein the implant is used in order to expand a site between bones, a site between cartilages, a site inside the cartilage, or a site inside the bone in the living body.

9. The implant assembly according to claim 1 ,

wherein the implant has a dumbbell shape in the expanded state.

10. The implant assembly according to claim 1 , further comprising a puncture device for introducing the implant into the living body, the puncture device including an inner needle configured to puncture the living body and an outer cylinder from which the inner needle can be inserted and removed.

11. The implant assembly according to claim 10 ,

wherein the guiding means includes a cylindrical portion having an open distal end.

12. The implant assembly according to claim 1 ,

wherein the implant includes an introduction port through which the filling material is introduced.

13. The implant assembly according to claim 1 ,

wherein the covering material includes natural products, chemically modified natural products, synthetic products or a mixture of two or more types of products.

14. The implant assembly according to claim 13 ,

wherein the covering material further includes at least one of a compatible liquid plasticizer and a filling material.

15. The implant assembly according to claim 1 ,

wherein the filling material includes a curing material.

16. An implant assembly comprising:

an implant configured to be transformable from a folded and contracted state to an expanded state by an introduced filling material, at least a portion of a surface thereof is covered with a covering material whose friction coefficient increases by coming into contact with a body fluid; and

guiding means for preventing the implant and the body fluid of a living body from coming into contact with each other inside the living body, and for guiding the implant to move to an indwelling position inside the living body;

wherein the guiding means has a lumen into which the implant can be inserted, and friction reducing means for reducing friction between the lumen and the implant disposed on at least a portion of an inner surface of the guiding means which is formed by the lumen;

wherein the friction reducing means is configured so that the inner surface of the guiding means is formed in an uneven shape; and

wherein the uneven shape includes a recessed groove and wherein an absorber which can absorb the body fluid is disposed inside a recessed groove formed on the inner surface of the guiding means.

17. The implant assembly according to claim 16 ,

wherein the friction reducing means is configured to include a low friction member which covers the inner surface of the guiding means.

18. The implant assembly according to claim 16 , further comprising a puncture device for introducing the implant into the living body, the puncture device including an inner needle which punctures the living body and an outer cylinder from which the inner needle can be inserted and removed.

19. The implant assembly according to claim 16 , wherein the covering material includes natural products, chemically modified natural products, synthetic products or a mixture of two or more types of products.