Rotational atherectomy device with biasing clutch

A plaque excision and rotational flexibility technology, applied in the direction of mechanical equipment, couplings, slip couplings, etc., can solve problems such as patient or equipment damage

Inactive Publication Date: 2016-01-20
CARDIOVASCULAR SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sudden release of this energy could cause damage

Method used

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  • Rotational atherectomy device with biasing clutch
  • Rotational atherectomy device with biasing clutch
  • Rotational atherectomy device with biasing clutch

Examples

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Embodiment Construction

[0042]An atherectomy device is disclosed having a clutch between a motor and a drive shaft. The clutch may include two plates that rely on friction to transfer torque from one plate to the other. The clutch may have an attractive magnetic normal force holding the plates together, or in another embodiment, a biasing mechanism may hold the plates together. For relatively low torques, as in normal use, the stiction torque can hold the plates together and the plates rotate together without slipping. For relatively high torques, such as occurs when the distal end of the drive shaft encounters an obstacle and comes to a sudden stop, this high torque exceeds the maximum possible static friction torque, and the plate slips. When sliding, the plate transmits kinetic friction torque low enough to avoid damage to the patient or to the atherectomy device. In some cases, the torque levels associated with stopping the distal end of the drive shaft are selected to be similar to those of kn...

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Abstract

A rotational atherectomy system may include a drive shaft, a motor, and a clutch with a threshold torque where the clutch may include a motor plate rotationally connected to the motor, a drive shaft plate rotationally connected to the drive shaft, and a biasing clutch configured to rotationally engage the motor plate and the drive shaft plate, wherein torques less than the threshold torque are transmitted completely between the motor plate and the drive shaft plate, which remain rotationally coupled by static friction, and wherein torques greater than the threshold torque cause the motor plate and the drive shaft plate to rotate relative to one another and cause a residual torque to be transmitted between the motor and the drive shaft, the residual torque being less than the threshold torque and being determined by a kinetic coefficient of friction.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application 61 / 787,027, filed March 15, 2013, entitled Rotary Atherectomy Device With Biased Clutch, the contents of which are hereby incorporated by reference in their entirety. [0003] Statement Regarding Government Sponsored Research or Development [0004] Not applicable technical field [0005] The present invention relates to devices and methods for removing tissue from body passages, such as removing atherosclerotic plaque from an artery using a rotational atherectomy device. In particular, the present invention relates to improvements in rotary atherectomy devices having biased clutches and / or shock absorbing elements. Background technique [0006] Atherectomy is used to open blocked coronary arteries or vein grafts by using a device on the end of a catheter to cut or scrape away atherosclerotic plaque (fat that accumulates in the lining of the art...

Claims

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Application Information

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IPC IPC(8): A61B17/3207
CPCA61B17/320758A61B2017/320004A61B2017/320766A61B2090/031F16D3/10F16D3/12F16D7/025
Inventor 约瑟夫·希金斯杰弗里·艾伦·麦克布鲁姆
Owner CARDIOVASCULAR SYST INC
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