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US 12,594,000 B2Granted
Cardiac catheter with deformable body
AssigneeSt. Jude Medical International Holding S.à r.l.
InventorAlexandre Romoscanu
Life of this patent
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Abstract
Aspects of the instant disclosure relate to various types of medical catheters with a deformable body that deflect in response to a force exerted on the catheter tip. A magnetic field sensor and permanent magnet respectively coupled on either side of the deformable body are used to determine a change in a magnetic field associated with the deflection of the catheter tip. Controller circuitry may receive a signal from the magnetic field sensor indicative of the deflection of the deformable body and associate the signal with the force exerted.
Claims22
A force sensing system for a medical catheter, the force sensing system comprising:
- a deformable body in an ablation catheter tip, the deformable body including distal and proximal portions, an inner portion, and an outer portion coupled to a catheter shaft, the outer portion configured with a deformable zone that facilitates deflection in at least one spatial dimension in response to a force exerted on the distal portion of the ablation catheter tip;
- a beam coupled to the distal portion of the deformable body, a first portion of the beam coupled to a sidewall of the catheter shaft and a second portion of the beam extending along a central axis of the proximal portion of the deformable body such that the central axis passes through the second portion of the beam;
- a permanent magnet attached to a proximal end of the beam;
- and
- a magnetic field sensor attached to the deformable body opposite the permanent magnet relative to the deformable body, the magnetic field sensor configured to measure a change in magnetic field associated with a change in relative position of the magnetic field sensor and permanent magnet as the deformable body deflects,
- wherein dimensional aspects of the deformable body are configured with a tunable compliance ratio relative to the deflection of the deformable body in response to the force exerted on the distal portion of the ablation catheter tip,
- wherein the dimensional aspects of the deformable body include one or more compliant leaf springs, the one or more compliant leaf springs comprising at least one slit elongated in a circumferential direction about the deformable body, and wherein the magnetic field sensor is further configured and arranged to sense a magnetic field that varies based on the deflection of the one or more compliant leaf springs manipulating a relative distance between the magnetic field sensor and the permanent magnet.
4 more elements
An electrophysiology ablation catheter comprising:
- an ablation catheter tip configured and arranged to conduct ablation therapy on tissue;
- a steerable catheter body;
- a deformable body coupling a proximal end of the ablation catheter tip and a distal end of the steerable catheter body, the deformable body including two or more tunable compliant leaf springs configured to cause deflection of the catheter tip relative to the steerable catheter body, each of the two or more tunable compliant leaf springs comprising at least one slit elongated in a circumferential direction about the deformable body, the deformable body further comprising an inner portion and an outer portion coupled to the steerable catheter body, the outer portion configured with a deformable zone that facilitates deflection in at least one spatial dimension;
- a beam coupled to the ablation catheter tip, a first portion of the beam coupled to a sidewall of the steerable catheter body and a second portion of the beam extending along a central axis of the proximal portion of the deformable body such that the central axis passes through the second portion of the beam;
- a permanent magnet attached to the proximal end of the beam;
- and
- a magnetic field sensor attached to the distal end of the steerable catheter body, and configured and arranged to sense a change in a magnetic field indicative of a deflection of the deformable body, wherein the change in the measurable characteristic varies based on the deflection of the one or more compliant leaf springs manipulating a relative distance between the magnetic field sensor and the permanent magnet,
- wherein the permanent magnet is configured to remain static in response to the deflection of the deformable body,
- wherein the ablation catheter tip is further configured and arranged to transfer a force exerted on the catheter trip to the deformable body during an ablation therapy,
- wherein dimensional aspects of the deformable body are configured with a tunable compliance ratio relative to the deflection of the deformable body.
7 more elements
A force sensing system for a medical catheter, the force sensing system comprising:
- a deformable body in an ablation catheter tip, the deformable body including distal and proximal portions, and inner portion, and an outer portion coupled to a catheter shaft, the outer portion configured with a deformable zone that facilitates deflection in at least one spatial dimension, the deformable body configured to deflect in response to a force exerted on the distal portion of the ablation catheter tip;
- a beam coupled to the distal portion of the deformable body, a first portion of the beam coupled to a sidewall of the catheter shaft and a second portion of the beam extending along a central axis of the proximal portion of the deformable body such that the central axis passes through the second portion of the beam;
- a measurement element attached to a proximal end of the beam;
- and
- a measurement receiver attached to the deformable body opposite the measurement element relative to the deformable body, the measurement receiver configured to measure a change in a measurable characteristic generated due to a change in relative position of the measurement element and receiver as the deformable body deflects in response to the force exerted on the distal portion of the deformable body,
- wherein both the measurement element and receiver are positioned on the same side of the deformable body, and
- wherein dimensional aspects of the deformable body are configured with a tunable compliance ratio relative to the deflection of the deformable body,
- wherein the dimensional aspects of the deformable body include one or more compliant leaf springs, the one or more compliant leaf springs comprising at least one slit elongated in a circumferential direction about the deformable body, and
- wherein the measurement receiver is further configured and arranged to sense a change in the measurable characteristic that varies based on the deflection of the one or more compliant leaf springs manipulating a relative distance between the measurement receiver and the measurement element.
6 more elements
Dependencies are inferred from the claim text.