Micro-cutting machine for forming cuts in products

• US 8,468,919 B2
• Filed: 12/08/2009
• Issued: 06/25/2013
• Est. Priority Date: 12/08/2008
• Status: Active Grant

• Current Assignee: Scientia Vascular, LLC
• Original Assignee: Next Vascular, LLC
• Inventors: Christian, Jeff, Christian, Ryan, Gasbarro, James A., Boehmke, Scott K., Lippert, John
• Primary Examiner(s): Alie, Ghassem
• Application Number:
  US12/633,727
• Publication Number:
  US 20100139465A1
• Time in Patent Office: 1,295 Days
• Field of Search: 451/18, 451/15, 451/8, 451/9, 451/41, 451/12, 451/13.01, 700/101, 700/99, 700/100, 700/121, 438/16, 438/113, 438/14, 438/33, 382/145, 83/76, 83/13, 83/62, 83/621, 833/10, 83/39, 835/78, 836/14, 834/85, 83/23, 832/09, 832/11, 835/20, 838/21, 83/73, 83/766
• US Class Current: 83/23
• CPC Class Codes: A61M 2025/09108 Methods for making a guide wire
• CPC Class Codes: A61M 25/0015 Making lateral openings in a catheter tube, e.g. holes, slits, ports, piercings of guidewire ports; Methods for processing the holes, e.g. smoothing the edges
• CPC Class Codes: A61M 25/09 Guide wires
• CPC Class Codes: B26D 1/24 coacting with another disc cutter
• CPC Class Codes: B26D 5/007 Control means comprising cameras, vision or image processing systems
• CPC Class Codes: B26D 5/20 with interrelated action between the cutting member and work feed
• CPC Class Codes: B26D 5/34 scanning being effected by a photosensitive device
• CPC Class Codes: B26D 7/06 Arrangements for feeding or delivering work of other than sheet, web, or filamentary form feeding or discharging sheets, webs, or filaments B65H
• CPC Class Codes: B26D 7/0683 specially adapted for elongated articles
• CPC Class Codes: B26F 1/0053 by machining, e.g. cutting, grinding, projections on the tube wall
• CPC Class Codes: B26F 1/0061 whereby the tube moves axially or radially B26F1/0038, B26F1/0046, B26F1/0053 take precedence
• CPC Class Codes: B26F 1/0076 and the tool rotates
• CPC Class Codes: Y10T 83/0448 With subsequent handling [i.e., of product]
• CPC Class Codes: Y10T 83/051 Relative to same tool
• CPC Class Codes: Y10T 83/145 Including means to monitor product
• CPC Class Codes: Y10T 83/173 Arithmetically determined program
• CPC Class Codes: Y10T 83/4458 Work-sensing means to control work-moving or work-stopping means
• CPC Class Codes: Y10T 83/4463 Work-sensing means to initiate tool feed
• CPC Class Codes: Y10T 83/828 With illuminating or viewing means for work
• CPC Class Codes: Y10T 83/8878 Guide

Abstract

Micro-cutting machines for forming cuts in catheters, guidewires, and similar products, are disclosed, including a micro-cutting machine that can directly control the dimensions of the resultant beams being cut into products, and that can capture images of each cut for feedback control and accuracy verification.

Claims

1. A method of cutting a plurality of cuts along a length of a stock material to form a product, comprising the steps of:

(a) moving the stock material to a first position along an X-axis;

(b) moving a first cutting member to a first Y-axis location and a second cutting member to a second Y-axis location to create one or more relative gap distances between the first cutting member and the second cutting member;

(c) moving the first cutting member and the second cutting member along a Z-axis while maintaining the one or more relative gap distances to cut into the stock material to form each pair of opposing cuts among the plurality of cuts and a resultant beam having one or more widths approximately equal to the one or more relative gap distances;

(d) controlling an angle of the stock material; and

(e) moving the stock material to a subsequent X-axis location;

(f) repeating steps (b) through (e) until each pair of cuts has been formed; and

(g) rotating the angle of the stock material based upon a desired variance in anticipation of each of the subsequent X-axis locations.

2. The method as recited in claim 1, wherein the first cutting member and the second cutting member simultaneously cut the stock material to form each pair of cuts.

3. The method as recited in claim 2, wherein the resultant beam is selected from the group consisting of a radius cut beam, a straight cut beam, a convex cut beam, and a spiral cut beam.

4. The method as recited in claim 1, wherein recording an image of the resultant beam of step (c) is performed using an imaging system that collects an image data of the stock material and the resultant beam after one or more of each pair of cuts are made in the stock material and the method further comprising:

transmitting the image data to a processor communicatively coupled to the imaging system;

receiving the image data from the imaging system; and

measuring at least an uncut diameter of the stock material and a width of the resultant beam.

5. The method as recited in claim 4, wherein the imaging system includes a camera positioned on a first side of an imaging area and one or more light sources positioned on the first side and on an opposite side of the imaging area, the one or more light sources illuminating the stock material and the resultant beam within the imaging area and the camera capturing the image data as the stock material and the resultant beam are illuminated.

6. The method as recited in claim 5, wherein the one or more light sources back-light the stock material and the resultant beam within the imaging area to increase visual contrast at one or more edges of the stock material to enable a measurement of the uncut diameter and the width.

7. The method as recited in claim 6, wherein the camera includes a red image channel, a green image channel and a blue image channel, wherein the one or more light sources include a red light, a green light, and a blue light, the method further comprising:

back-lighting the stock material using the red light;

illuminating the stock material for visual inspection by an operator using the green light and the blue light;

transmitting the red light through the red image channel to the processor using the imaging system;

transmitting the green light through the green image channel to the processor using the imaging system; and

transmitting the blue light through the blue image channel to the processor using the imaging system.

8. The method as recited in claim 4, further comprising measuring the uncut diameter and the width with one or more overlays placed over the image data within the imaging area by comparing a number of pixels located within the one or more overlays to a known number of pixels associated with a known distance.

9. The method as recited in claim 4, wherein the processor includes a storage system for storing the image data for monitoring quality control over time.

10. The method as recited in claim 9, wherein moving the first cutting member and the second cutting member along a Z-axis further comprises the first cutting member and the second cutting member simultaneously cutting the stock material to form each pair of cuts, the method further comprising capturing an image for one or more of each pair of cuts on a periodic basis or a random basis, and storing the image in the storage system.

11. The method as recited in claim 1, wherein the first cutting member and the second cutting member are micro-cutting blades, wherein the cutting apparatus includes a first spindle for holding the first cutting member and a second spindle for holding the second cutting member, the first spindle being driven by a first spindle motor, the second spindle being driven by a second spindle motor, the first spindle motor and the second spindle motor controlling a rotational speed of the micro-cutting blades.

12. The method as recited in claim 11, wherein the rotational speed is approximately 24,000 revolutions per minute when the stock material is formed of a non-conductive material.

13. The method as recited in claim 1, wherein the stock material is comprised of a conductive material or a non-conductive material.

14. The method as recited in claim 13, wherein the conductive material is selected from the group consisting of stainless steel and nickel titanium.

15. The method as recited in claim 13, wherein the non-conductive material is formed of polyetheretherketone.

16. The method as recited in claim 1, wherein moving the stock material to a first position along the x-axis includes using a feed trough for supporting and guiding the stock material.

17. The method as recited in claim 1, wherein the product is a guide wire or a catheter.

18. The method as recited in claim 1, wherein moving the first cutting member and the second cutting member along a Z-axis further comprises the first cutting member and the second cutting member simultaneously cutting the stock material to form each pair of cuts, each pair of cuts being on a different plane.

19. The method as recited in claim 1, wherein moving the first cutting member to the first Y-axis location and the second cutting member to the second Y-axis location further comprises using a stock material controller that includes at least a feed motor holding the stock material for a first pair of cuts among the plurality of cuts the method further comprising:

feeding the stock material forward along the X-axis a predetermined distance; and

holding the stock material

moving the first cutting member and the second cutting member along a Z-axis while maintaining the one or more relative gap distances to cut into the stock material to form a second pair of cuts among the plurality of cuts, the stock material controller further including a rotational motor rotating the stock material by a predetermined angle around the X-axis between the first pair of cuts and the second pair of cuts such that the first pair of cuts is offset from the second pair of cuts by the predetermined angle, the predetermined distance and the predetermined angle being controlled by the electronic controller.

20. The method as recited in claim 19, wherein the first cutting blade and the second cutting blade simultaneously cut the stock material to form the second pair of cuts.

21. The system as recited in claim 20, wherein the resultant beam is selected from the group consisting of a radius cut beam, a straight cut beam, a convex cut beam, and a spiral cut beam.

22. The method as recited in claim 1, further comprising the steps of:

recording an image of the resultant beam of step (c); and

measuring the image to determine whether the one or more widths of the resultant beam are sufficiently close to one or more desired widths of the resultant beam.

23. The method as recited in claim 22, further comprising the step of ceasing operation of the first cutting member and the second cutting member if the one or more widths of the resultant beam are not sufficiently close to the one or more desired widths of the resultant beam.

24. The method as recited in claim 1, further comprising the step of cutting a serial number into the stock material with the first cutting member and/or the second cutting member.

25. The method as recited in claim 1, wherein the resultant beam is selected from the group consisting of a radius cut beam, a straight cut beam, a convex cut beam, and a spiral cut beam.

26. The method as recited in claim 1, wherein moving the first cutting member and the second cutting member along a Z-axis is done simultaneously.