The invention provides bioresorbable nerve guidance conduits made from polymer blends which include polyhydroxyalkanoates (PHAs). In particular, the invention provides nerve guidance conduits having a body which comprises a polymer blend comprising:(a)from 60 to 98wt.% of a first component which is a PHA copolymer comprising two or more different medium chain length hydroxyalkanoate monomer units； and(b)from 2 to 40wt.% of a second component which is either a PHA homopolymer containing a short chain length hydroxyalkanoate monomer unit, or a polylactide (PLA). The invention further relates to polymer blends comprising (a) and (b).
