| 摘要 |
<p>A variable curvature catheter (4) with a strong capacity to maintain the desired curvature comprising a catheter body (8) which extends from a proximal end (12) to a distal end (16), provided with a side wall (20) which defines at least one cavity (24); the catheter body (8) comprises, at said distal end (16), a variable curvature section (28) which ends in a tip (32). Inside the cavity (24) at least one traction wire (36) is housed having an ascending branch (40), which extends from the proximal end (12) towards the distal end (16) so as to at least partially go through the variable curvature section (28) at least as far as a first fork (44). The traction wire (36) extends from the first fork (44) at least partially going through the variable curvature section (28), coming out of the variable curvature section (28) and rejoining the ascending branch (40) at said first fork (44), so as to form a closed loop (48) which at least partially goes through the variable curvature section (28) closing itself on the first fork (44). The traction wire (36), after closing itself in a loop (48) on the first fork (44), extends towards the proximal end (12) along a descending branch (52). The descending branch (52) slides in relation to the ascending branch (40) inside constraint means (64, 68, 72) joined to the ascending branch (40) at said first fork (44), the constraint means (64, 68, 72) permitting the relative sliding of the descending branch (52) in relation to the ascending branch (40) and ensuring the closure of the loop (48) run through by the traction wire (36) along the variable curvature section (28). Applying the traction instead to the ascending wire (40) and releasing the descending wire (52), the curvature is loosened and it is possible to remove the wire completely, leaving the lumen (24) of the catheter free. The catheter (4) may comprise at least one guide element (92) of an elongated and flexible shape, slidingly engageable inside the cavity or lumen (24) of the catheter body (8), to come out through the tip (32) and a stabilisation element (96) of an elongated shape along a main direction of extension (X-X) and flexible, slidingly engageable inside the cavity or lumen (24) of the catheter body (8) into which it is introduced and which it comes out of through a stabilisation aperture (100).</p> |
