Improve Braided Shaft Performance

Device shafts can be optimized for flexibility, kink resistance, torque and tracking. Braided shafts are the best solution for catheter designs requiring excellent torque response.
A number of alternative design approaches are suggested to affect performance and optimize overall braided shaft design.

  • Introduce greater shaft flexibility by specifying varying durometers along the outer jacket length – higher durometers will stiffen the shaft.
  • Could a braid-coil hybrid work for your design? By combining a braid and coil solution you may be able to achieve the optimal balance of torque and flexibility along the length of the shaft. In addition the overall wall thickness of the shaft can be greatly reduced by using a coil design.
  • By varying the pitch of the braid i.e. the number of times a wire crosses in a 1” length of the shaft, you can achieve different levels of flexibility and kink resistance.
  • Using a 2 wire diamond pattern, full load for the braid design will increase flexibility and torque response.
  • Consider flat and round wire alternatives for your braid design – round wires will provide a more flexible shaft but will increase overall profile. Flat wires, while providing lower profiles and providing high levels of torque will not provide the same flexibility.

If these design alternatives do not achieve desired performance outcomes you may wish to consider alternatives to a braided shaft such as a metal shaft or extruded shaft

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