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PolyPIN - Bioresorbable Bone Replacement
PolyPIN is a bioresorbable bone pin from polylactide. Metal implants are normally removed in a second operation, once the bone has healed.
This not only means additional expense, but is also stressful for the patient! What is more, a second stay in hospital is necessary to remove the metal, involving absence from work and increased risk of complications. The ideal osteosynthesis implant should, therefore, simply dissolve after it has fulfilled its stabilising or fixing task, without subjecting the body to an additional burden in doing so. The Polypin is such an implant. It is a pin made of a polylactide copolymer (Poly L/D, L- Lactide 70/30). Thanks to the material it is made of and the way it is designed, it offers significant advantages.
The PolyPIN special design is its distinguishing feature and improves its performance:
The head exerts a slight compression on the facture fragments.
The circular ribs prevent the PolyPIN from slipping.
The Polypin is available in three different diameters:
- PolyPIN 1.5, length: 8 – 25 mm
- PolyPIN 2.0, length: 10 – 35 mm
- PolyPIN 2.7, length: 12 – 60 mm
Fractures subject to low load stresses: PolyPIN 1.5
Fixation of bony or osteochondral fragments: e.g. fractures to the heads of metacarpal bones, arthrodeses of fingers and toes, stabilising of certain finger factures, osteochondral factures or dissections eochondral fractures or dissections.
Apical fragements, osteochondral fractures or dissections: PolyPIN 2.0
Apical fragments: e.g. fractures of the radial head, fracture of the patella rim, fractures at the proximal and distal ends of the metatarsal and metacarpal bones.
Osteochondral fractures or dissections:
e.g. ankle-bone dome, femoral condyle, cancellous fragments or those subject to low stresses: e.g. layered reconstruction of fractures of the heel or acetabulum, corticocancellous grafting of chips.
Large osteochondral fragments: PolyPIN 2.7
Large osteochondral fragments: e.g. fractures of the femur head (Pipkin fractures), fractures of the malleolus (Weber A fractures), fractures of the radius, longitudinal fractures of the patella.
The PolyPIN is made of polylactide, an absorbable biomaterial which has proved its worth as a material for biological implants, as shown by extensive in vitro an in vivo testing an in clinical use over several years. The special copolymer (Poly L/D, L- Lactide 70/30) has good absorption properties:
Its flexural strength remains constant for 34 weeks, which is a sufficient time for the fracture to heal, and then drops at a constant rate.
Biological degradation takes place mainly due to hydrolysis, into lactic acid, which is a natural product of metabolism, and is subsequently metabolised into CO2 and H2O. Within 15 months the Polypin is completely degraded from a mechanical point of view, although it can still be detected in the form of a cylindrical fragment of the original pin.
After 18 to 21 month only fibrous cords are recognisable and after another three months the place of implant is filled with bony substance. Studies have shown that the same results are achieved both by the Polypin and a metal implant, but in the case of the Polypin no implantdependent complications arise.
The PolyPIN special design is its distinguishing feature and improves its performance:
- The head exerts a slight compression on the facture fragments
- Circular ribs prevent the PolyPIN from slipping
The Polypin is available in three different diameters:
- 1.5 mm PolyPIN, length: 8 - 25 mm
- 2.0 mm PolyPIN, length 10 - 35 mm
- 2.7 mm PolyPIN, length: 12 - 60 mm