| 摘要 |
An instrument shaft for use in small openings where enhanced longitudinal dimensional stability and compressive loading characteristics are desirable. Various embodiments may be shafts of catheters used to treat peripheral vasculatures or coronary vasculatures. Embodiments of the catheter shaft provide enhanced longitudinal dimensional stability and compressive loading characteristics, while maintaining flexibility under loading conditions. In one embodiment, a catheter shaft includes an outer catheter shaft with a lumen therethrough, and an annular compression spring inside the outer catheter shaft. Also included is an actuation member inside the annular compression spring, wherein the actuation member actuates a working element at a distal end of the catheter.
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