Continuously adjustable cutting tool for preparing valve leaflet

Patent metadata

Field	Value
Publication number	US-2019125526-A1
Application number	US-201816227315-A
Country	US
Kind code	A1
Filing date	Dec 20, 2018
Priority date	Sep 20, 2016
Publication date	May 2, 2019
Grant date	—

Abstract

A device prepares leaflets for cardiovascular valve reconstruction from a pericardial tissue sheet harvested from a patient. A cutting tool is adapted to cut a predetermined pattern having a selected leaflet size. The device is continuously adjustable using a plurality of slidable blade segments forming a closed periphery. Radially-slidable links are slidably attached to respective blade segments. An adjustment disc is coupled to the links, wherein rotation of the adjustment disc varies a radial position of the links to modify an overlapping of the blade segments in order to select a corresponding size of the closed periphery.

First claim

What is claimed is:

1 . A device for preparing leaflets for cardiovascular valve reconstruction, comprising:
a plurality of slidable blade segments forming a closed periphery for penetrating a membrane to cut a leaflet; radially-slidable links slidably attached to respective blade segments; and an adjustment disc coupled to the links, wherein rotation of the adjustment disc varies a radial position of the links to modify an overlapping of the blade segments in order to select a corresponding size of the closed periphery.

2 . The device of claim 1 wherein each blade segment includes an elongated slot receiving a fastener for slidably attaching the blade segment to the respective slidable link.

3 . The device of claim 1 further comprising:
a cam block having radial slots receiving a respective link; and
guide pins fixed to respective links perpendicular to the radial slots;
wherein the adjustment wheel has spiral guide slots each receiving a respective guide pin.

4 . The device of claim 3 wherein the slidable links is each comprised of an L-shaped member with a radial leg received in a respective radial slot and an axial leg connected to a respective blade segment.

5 . The device of claim 1 further comprising:
a spindle having a threaded outer surface; and
a push block having a plurality of internal channel-shaped slots with slanted end walls;
wherein the adjustment wheel is comprised of a disc with a threaded, inner cylindrical surface engaging the threaded outer surface of the spindle;
wherein rotation of the disc causes axial movement of the disc which is transferred to the push block; and
wherein the links are comprised of pins coupled to the blade segments and disposed in the internal slots of the push block to engage the slanted end walls which converts the axial movement of the push block into radial movement of the pins.

6 . The device of claim 5 further comprising an end plate mounted to an axial end of the push block for enclosing the pins in the internal slots.

Assignees

• Terumo Cardiovascular Sys Corp

Inventors

• Tsubouchi Takeshi
• Kadykowski Randal J

Classifications

• A61F2/2415 Primary

  Manufacturing methods · CPC title

• A61F2/24 Primary

  Heart valves {; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body} · CPC title

• A61B17/32053

  Punch like cutting instruments, e.g. using a cylindrical or oval knife (A61B17/326 takes precedence; trepans A61B17/1695) · CPC title

• A61B2017/320052

  Guides for cutting instruments · CPC title