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Rotational atherectomy systems and methods with shock absorbing element

A technology of shock absorption element and extension element, which is used in surgical cutting instruments, medical science, surgery, etc., and can solve problems such as patient or device damage

Inactive Publication Date: 2016-11-09
CARDIOVASCULAR SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This sudden release of energy may cause damage to the patient or device and should be avoided

Method used

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  • Rotational atherectomy systems and methods with shock absorbing element
  • Rotational atherectomy systems and methods with shock absorbing element
  • Rotational atherectomy systems and methods with shock absorbing element

Examples

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Embodiment Construction

[0045] A percutaneous atherectomy device having a clutch between a motor and a drive shaft is disclosed. The clutch may include two plates that rely on friction to transmit 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 would be the case during 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 percutaneous atherectomy device. In some cases, the torque levels associated with stopping of the distal end of the dri...

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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] inventor [0002] Joseph Higgins, US citizen, living in Minnetonka, MN [0003] Jeffrey Allen McBroom, US citizen, living in Champlin, MN [0004] Cross References to Related Applications [0005] This application is a continuation of U.S. Patent Application 14 / 208,478, filed March 13, 2014, which claims application filed on January 28, 2014, entitled "Apparatus, system, and method for a shock-absorbing drive system for a medical device (device , systemsts and methods for a shock absorbing drive system for medical devices)" U.S. Provisional Patent Application 61 / 932409, and filed March 15, 2013 entitled "Rotational atherectomy device with biasing clutch clutch)”, the contents of which are hereby incorporated by reference in their entirety. [0006] Statement Regarding Government Sponsored Research or Development [0007] Not applicable technical field [0008] The present invention relates to devices and methods for removing tissue from bodily passages, such as ath...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/22A61B17/3207F16D7/02
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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