Bone substitute and independent injection system

A device comprising:

• a syringe prefilled with a single-use dose of a composition for bone filling,
• wherein said composition comprises at least one resorbable or non-resorbable thermoplastic polymer material,
• wherein said composition has a viscosity between 40 and 4000 Pa·s at a temperature of about 50° C. and a Young's modulus between 0.5 and 4 GPa at about 37° C.,
• wherein said composition is in the form of a rod or pellets and comprises by weight 40 to 100% of a polycaprolactone polymer having a molecular weight between 30,000 and 60,000, and 0 to 60% of a calcium phosphate biomaterial,
• wherein said syringe enables both the storage and administration of said composition,
• wherein said syringe comprises:
• a syringe body having an opening at each of its two ends,
• a distal first opening bearing sealing means for sealing it closed and/or means for the administration of said composition, and
• a proximal second opening being sealed closed by sealing means slidable inside the syringe body,
• wherein said syringe body, said sealing and/or administration means, and said slidable sealing means define a volume within which said dose is contained;
• and
• an external heating means structurally separate from the syringe and making it possible to heat it and melt or soften the dose of the composition for bone filling for the purposes of its administration.