公開/公告號

US10299820B2

申請日

2016-02-18

發明名稱

Methods and systems for disrupting calcified walls of biological conduits and calcified lesions therein

解決的技術問題

The present invention generally relates to methods and systems used for removing or modifying tissue from bodily passageways or conduits, such as removal and/or modification of atherosclerotic plaque from arteries, using a high-speed rotational atherectomy device. More specifically, the present invention relates to softening or otherwise disrupting calcification within a lesion and/or the intimal and/or medial wall layers of the passageway or conduit, e.g., an artery, using a combination of a low-frequency orbital motion and/or a high-frequency pulsatile frequency thereby increasing the compliance of the lesion and/or wall layers.

技術方案

The present system is directed in various embodiments to rotational atherectomy systems and methods generally. More specifically, a method for methodically softening and disrupting calcification within the wall of a biological conduit or lumen. This result is achieved by use of at least one eccentric head that, during high-speed rotation within the exemplary lumen, produces a combination of a low-frequency orbital motion comprising a force that is exerted against the lumen wall, with concomitant deflection of same, and a high-frequency pulsatile frequency, also with concomitant exertion of force against the lumen wall and deflection of same. These force-driven deflections produce shockwaves  within the layers of the exemplary artery's wall layers, resulting in systematic disruptions of any calcification within the intimal and/or medial layers of the subject artery. In addition, any calcification within the occlusion is also softened and disrupted, increasing compliance of the vessel and/or lesion.

相關附圖

公開/公告號

US7174240B2

申請日

2002-10-16

發明名稱

Control system for rotational angioplasty device

解決的技術問題

In one aspect the present invention is directed to a rotational atherectomy system. In one embodiment the system comprises a rotational atherectomy device, a fluid source adapted to supply fluid to the device, a pump system adapted to pump fluid from the fluid source to the device, a first switch adapted to increase a flow of fluid from the fluid source to the device from a first flow rate to a second flow rate when the switch is activated and a second switch adapted to activate a rotation of a drive shaft in the device when the second switch is activated.

技術方案

A method for controlling fluid flow in a rotational atherectomy device. A source of fluid is provided through a pump to the rotational atherectomy device, wherein the pump maintains the fluid flow at a minimal rate during a time period when a drive shaft of the device is not rotating. A first control is activated to increase a rate of the fluid flow and second control is activated to initiate a rotation of the drive shaft during another time period when the fluid flow is at the increased rate.

相關附圖