| 摘要 |
A stylet (26) and hub (36) assembled for stiffening a catheter (10) in rapid exchange mode. The catheter guidewire lumen (20) has a side port (22) associated with a bi-stable guide element (24) that lies across the lumen. A disengageable feature assembly (38) limits insertion of the stylet into the lumen in rapid exchange mode. To convert from rapid exchange mode, disengagement of the disengageable feature enables the stylet to displace the guide element, clearing the guidewire lumen and enabling guidewire or other device to extend throughout the lumen. The stylet has a long proximal portion (34), a relatively short portion (32) tapering distally to a smaller diameter, and enlarged end (34). The guide element is formed by plastic deformation of the catheter wall. The disengageable feature is in a removable housing (28) having an end cap (54) that can be replaced with a syringe for flushing liquid along the stylet. A balloon (12), preferably a PTCA balloon, is mounted on the catheter.
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