Catheter with stretchable irrigation tube
In one embodiment, a medical system includes a catheter configured to be inserted into a body part of a living subject, and including a deflectable element having a distal end, an expandable distal end assembly disposed at the distal end of the deflectable element, and comprising a plurality of electrodes, a distal portion, and a proximal portion, and configured to expand from a collapsed form to an expanded deployed form, and a stretchable irrigation tube disposed between the distal portion and the proximal portion, and comprising a plurality of irrigation holes, and configured to stretch longitudinally when the distal end assembly is collapsed from the expanded deployed form to the collapsed form.
1 . A medical device, the medical device comprising:
a deflectable element extending along a longitudinal axis from a proximal end to a distal end;
a distal end assembly disposed at the distal end and comprising a proximal portion and a distal portion;
an electrode attached to the distal end assembly; and
a stretchable irrigation element disposed between the proximal portion and the distal portion and comprising a plurality of irrigation holes, a distal end of the stretchable irrigation element being attached to the distal portion to move together with the distal portion to stretch or relax the stretchable irrigation element depending on an axial position of the distal portion relative to the proximal portion.
2 . The medical device of claim 1 , the plurality of irrigation holes being disposed such that each irrigation hole of the plurality of irrigation holes extends at an angle relative to the longitudinal axis.
3 . The medical device of claim 2 , wherein the angle relative to the longitudinal axis of a first irrigation hole of the plurality of irrigation holes is different than the angle relative to the longitudinal axis of a second irrigation hole of the plurality of irrigation holes, the first irrigation hole being adjacent the second irrigation hole.
4 . The medical device of claim 1 , the plurality of irrigation holes being disposed radially around the stretchable irrigation element.
5 . The medical device of claim 1 , the plurality of irrigation holes being disposed longitudinally along the stretchable irrigation element.
6 . The medical device of claim 1 , the electrode being configured for electro-anatomical mapping of an organ.
7 . The medical device of claim 1 , the electrode being configured for ablation of tissue of an organ.
8 . The medical device of claim 1 , the distal end assembly further comprising a spline configured to bow radially outward from the longitudinal axis, the electrode being attached to the spline.
9 . The medical device of claim 1 , the distal end assembly further comprising a plurality of splines extending between the proximal portion and the distal portion, the plurality of splines configured to transition between a collapsed form and an expanded deployed form.
10 . The medical device of claim 9 , the electrode being one of a plurality of electrodes, each spline of the plurality of splines comprising a respective electrode of the plurality of electrodes.
11 . The medical device of claim 10 , wherein a relaxed state of the distal end assembly is the expanded deployed form, the distal end assembly being configured to collapse into the collapsed form when the distal end assembly is retracted in a sheath.
12 . The medical device of claim 10 , wherein a relaxed state of the distal end assembly is the collapsed form, the medical device further comprising a puller element disposed inside the distal end assembly and the stretchable irrigation element, and connected to the distal portion of the distal end assembly, and configured to, when pulled, to expand the distal end assembly from the collapsed form to the expanded deployed form.
13 . The medical device of claim 9 , each spline of the plurality of splines comprising nitinol.
14 . The medical device of claim 1 , the stretchable irrigation element comprising a biocompatible stretchable material.
15 . The medical device of claim 1 , further comprising a magnetic position sensor disposed at the distal end of the deflectable element.
16 . A stretchable irrigation element for a medical device, the stretchable irrigation element comprising:
a tube extending along a longitudinal axis from a proximal end to a distal end, the proximal end configured for attachment to a deflectable element and the distal end configured for attachment to a distal portion of a basket catheter, the tube configured to be stretched axially relative to the longitudinal axis between an unstretched state and a stretched state when a force is applied to the tube; and
a plurality of irrigation holes disposed longitudinally along the tube and configured to direct irrigation fluid outwardly from the longitudinal axis toward electrodes of the basket catheter, the plurality of irrigation holes defining a slot-like shape when the tube is in the stretched state, and the plurality of irrigation holes defining an approximately circular shape when the tube is in the unstretched state.
17 . The stretchable irrigation element of claim 16 , the plurality of irrigation holes being further disposed radially around the tube.
18 . The stretchable irrigation element of claim 16 , the plurality of irrigation holes being disposed such that each irrigation hole of the plurality of irrigation holes extends at an angle relative to the longitudinal axis.
19 . The stretchable irrigation element of claim 18 , wherein the angle relative to the longitudinal axis of a first irrigation hole of the plurality of irrigation holes is different than the angle relative to the longitudinal axis of a second irrigation hole of the plurality of irrigation holes, the first irrigation hole being adjacent the second irrigation hole.
20 . The stretchable irrigation element of claim 16 , the stretchable irrigation element comprising a biocompatible stretchable material.