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    • 7. 发明申请
    • ORTHOPEDIC CASTS
    • WO1995013039A2
    • 1995-05-18
    • PCT/US1994013007
    • 1994-11-08
    • LANDEC CORPORATIONGREENE, Lawrence, C.DAHLEN, Burton, L.LARSON, Andrew, W.TAFT, David, D.BITLER, Steven, P.
    • LANDEC CORPORATION
    • A61F13/04
    • A61L15/12A61F5/058A61F13/04A61F13/041Y10S264/71Y10S428/913Y10S524/921Y10T428/1314Y10T428/1328Y10T428/1334Y10T428/1362Y10T428/1372Y10T428/1376Y10T428/1386Y10T428/139Y10T428/1393Y10T428/24322Y10T428/24331Y10T442/2811C08L67/04
    • Heat-recoverable orthopedic casts include a support which is maintained in an elastically deformed condition by a casting polymer, e.g. a polycaprolactone (PCL) or a side chain crystallizable polymer having a relatively low melting point. The cast is placed around the limb and is then heated. The casting polymer softens and the cast recovers around the limb. A liner is preferably placed between the cast and the limb, especially when the casting polymer is PCL or has a comparable or higher melting point. For high strength casts, the support is preferably an open-mesh knitted fabric which, when fully relaxed, contains at most 300 holes per inch (at most 45 holes per cm ). Such a fabric, when it is extensible to a maximum of 15 to 40 %, is also useful as casting tape which comprises a curable polymer casting composition, e.g. a water-curable polyurethane prepolymer. As illustrated in Figures 1 and 2, a stockinette liner (2) is preferably placed between the cast (1) and the limb as a thermal barrier. A reinforcing component may be used to strengthen the recovered cast. Suitable reinforcing components include (A) polyurethane precursors which are applied to the cast before or after recovery, and are polymerized during or after recovery, and (B) thermoplastic materials which are applied hot to the recovered cast. Casts made in this way can be divided to make splints which can be easily removed and replaced.
    • 可热恢复的矫形铸件包括通过流延聚合物保持在弹性变形状态的支撑件,例如。 具有较低熔点的聚己内酯(PCL)或侧链可结晶聚合物。 将铸件放置在肢体周围,然后加热。 铸塑聚合物软化,铸件在肢体周围恢复。 衬垫优选放置在铸件和肢体之间,特别是当铸塑聚合物为PCL或具有相当或更高的熔点时。 对于高强度铸件,支撑件优选是开式针织物,其在完全松弛时,每英寸2(至多45个孔/ cm 2)最多包含300个孔。 这种织物当其可延伸至最多15至40%时也可用作包含可固化聚合物浇铸组合物的浇铸胶带,例如, 水可固化聚氨酯预聚物。 如图1和图2所示,优选的是一个筒状衬垫(2)作为热障而放置在浇注(1)和肢体之间。 可以使用增强部件来加强回收的铸件。 合适的增强组分包括(A)在回收之前或之后施加到铸件上并在回收期间或之后聚合的聚氨酯前体,和(B)热回收的铸件热塑性材料。 以这种方式制造的铸件可以分割成可以容易地去除和更换的夹板。