Micromachining system

• US 6,553,880 B2
• Filed: 07/17/2001
• Issued: 04/29/2003
• Est. Priority Date: 09/16/1996
• Status: Expired due to Term

• Current Assignee: SARCOS LC (Sarcos Technology & Robotics Corp.)
• Original Assignee: SARCOS LC (Sarcos Technology & Robotics Corp.)
• Inventors: Jacobsen, Stephen C., Davis, Clark
• Primary Examiner(s): Goodman, Charles
• Application Number:
  US09/908,445
• Publication Number:
  US 20020078808A1
• Time in Patent Office: 651 Days
• Field of Search: 83/75, 83/62, 83/621, 83/63, 832/11, 833/67, 833/68, 833/70, 832/09, 832/10, 832/40, 832/48, 832/57, 832/82, 834/09, 834/18, 834/21, 834/65, 834/661, 834/22, 834/712, 834/713, 834/85, 834/86, 834/861, 835/56, 835/63, 837/33, 838/63, 838/64, 838/81, 838/86, 837/50, 269/245.R, 279/46.1, 451/8, 451/9, 451/10, 451/21, 451/381, 451/61
• US Class Current: 83/75
• CPC Class Codes: A61M 25/0009 Making of catheters or other medical or surgical tubes
• CPC Class Codes: A61M 25/09 Guide wires
• CPC Class Codes: B23D 45/027 the saw carriage being mounted on a carriage, e.g. gantry-type sawing machines
• CPC Class Codes: B23D 45/124 the workpieces turning about their longitudinal axis during the cutting operations
• CPC Class Codes: B23D 47/06 for stock of indefinite length
• CPC Class Codes: B23D 59/002 for the position of the saw blade B27B5/36 and B27B9/02 take precedence
• CPC Class Codes: B23Q 17/09 for indicating or measuring cutting pressure or for determining cutting-tool condition, e.g. cutting ability, load on tool arrangements preventing overload of tools B23Q11/04; devices for indicating failure of drills during boring B23B49/00
• CPC Class Codes: B24B 49/183 Wear compensation without the presence of dressing tools
• CPC Class Codes: B26D 1/16 mounted on a movable arm or the like
• CPC Class Codes: B26D 1/18 mounted on a movable carriage
• CPC Class Codes: B26D 3/16 Cutting rods or tubes transversely cutting tubes longitudinally B26D3/001
• CPC Class Codes: B26D 3/161 for obtaining more than one product at a time
• CPC Class Codes: B26D 5/00 Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
• CPC Class Codes: B26D 5/02 Means for moving the cutting member into its operative position for cutting
• CPC Class Codes: B26D 7/0683 specially adapted for elongated articles
• CPC Class Codes: Y10T 83/0385 Rotary scoring blade
• CPC Class Codes: Y10T 83/152 And modify another operation
• CPC Class Codes: Y10T 83/446 With means to initiate tool feed by same control impulse
• CPC Class Codes: Y10T 83/4463 Work-sensing means to initiate tool feed
• CPC Class Codes: Y10T 83/4506 Work feed means carried by tool or tool support
• CPC Class Codes: Y10T 83/4645 : With means to clamp work during dwell
• CPC Class Codes: Y10T 83/527 : With means to control work-responsive signal system
• CPC Class Codes: Y10T 83/536 : Movement of work controlled
• CPC Class Codes: Y10T 83/538 : Positioning of tool controlled
• CPC Class Codes: Y10T 83/541 : Actuation of tool controlled in response to work-sensing means
• CPC Class Codes: Y10T 83/6577 : With means to adjust additional means
• CPC Class Codes: Y10T 83/6579 : With means to press work to work-carrier
• CPC Class Codes: Y10T 83/7587 : Gapped work-constrainer
• CPC Class Codes: Y10T 83/7768 : With means to adjust path of reciprocation

Abstract

A micro-machining system configured for cutting an elongate object, including a clamp configured to enable repeatedly releasing and then holding the elongate object in a position suitable for cutting the elongate object transversely relative to its lengthwise axis, and a manipulating means, which can include a pinch roller feed configured to advance the elongate element and to rotate it about a lengthwise axis of the elongate object, thereby moving the elongate object so that it can be disposed in the position suitable for cutting, and a cutter configured for forming the at least one precision cut in the elongate object to a desired depth, under the control of a controller.

Claims

1. A micro-machining system configured for cutting an elongate element of small transverse dimension having a lengthwise axis, comprising:

a controller programable to enable control of cuts in the elongate element with respect to each other in terms of position along and around the lengthwise axis and to a depth desired;

a clamp configured to enable repeatedly releasing and then holding the elongate element in a fixed position for cutting the elongate element transversely relative to the lengthwise axis;

a pinch roller feed configured to advance the elongate element and to rotate the elongate element about the lengthwise axis of the elongate element, thereby moving the elongate element so that the elongate element is disposed in a position for cutting;

a contact reference position sensor; and

a cutter configured for forming at least one precision cut in the elongate element to the depth desired into the elongate element from a sensed first contact by the cutter with the elongate element.

2. A micro-machining system as in claim 1, wherein the contact reference position sensor comprises an electric circuit completed by contact between the cutter and the elongate element.

3. A micro-machining system as in claim 2, wherein the circuit is an AC circuit and proximity of the cutter to the elongate element is sensed before contact is made.

4. A micro-machining system as in claim 1, wherein the contact reference position sensor comprises an optical sensor which senses contact between the cutter and the elongate element.

5. A micro-machining system as in claim 1, wherein the cutter is a rotating cutting blade forming a kerf of a width less than 0.003 inches.

6. A micro-machining system as in claim 1, where in movements of the pinch roller and the cutter are facilitated by stepper motors controlled by the controller.

7. A micro-machining system as in claim 1, further comprising another position sensor configured to provide a feedback to the controller of position change of the cutter moved under control of the controller.

8. A micro-machining system as in claim 1, wherein the contact position sensor is configured to sense of least one of a) an amount of blade wear on the cutter comprising a cutting blade;

b) an asymmetry of the elongate element about the lengthwise axis at a given point along tire length thereof.

9. A system for micro-machining an elongate element having a lengthwise axis, comprising:

a controller configured to control operation of the system, programable to produce micro-machined elongate elements of desired configurations;

a clamp configured to engage and release the elongate element under control of the controller;

manipulating means configured to move the elongate element along the lengthwise axis and to rotate the elongate element about the lengthwise axis under the control of the controller, further comprising an actuator controlled by the controller configured to rotate the elongate element, and an actuator controlled by the controller configured to move the elongate element along the lengthwise axis;

a saw blade configured to form cuts of small dimensions in the elongate element and an actuator configured to move the saw blade toward and away from the elongate element under control of the controller;

a contact reference point identification system configured to provide a signal interperatable by the controller indicating that the saw blade has approached the elongate element and just made contact therewith without appreciable depth of cut to thereby control depth of cut from a contact reference point into the elongate element by the saw blade,

whereby the elongate element is clamped to hold the elongate element in a fixed position, and a first cut of precisely controlled depth is made, and the elongate element is released and at least one of rotated and moved along and about the lengthwise axis so that a second precise cut is made at a desired depth in a desired position relationship to the first cut.

10. A system as in claim 9, further comprising a stepper motor under control of the controller configured to actuate at least one of the manipulating means and the saw blade.

11. A system as in claim 9, wherein said actuator facilitating movement of the saw blade toward and away from the elongate element further comprises a caliper and a stepper motor operatively connected to the caliper, configured to position the saw blade with respect to the elongate element with precision, whereby a depth of cut with respect to the contact reference point is precisely controlled.

12. A system as in claim 11, wherein the contact reference point identification system further comprising a movement sensor configured to sense movement of the saw blade toward and away from the elongate element wherein feedback control of the saw blade position is facilitated.

13. A system as in claim 12, wherein the movement sensor 19 at least one of a linear differential transformer and a linearly variable differential capacitor.

14. A system as in claim 9, wherein the actuator configured to move the elongate element along the lengthwise axis further comprising a stepper motor under control of the controller operatively coupled to the manipulating means to advance the elongate element.

15. A system as in claim 9, wherein the actuator configured to rotate the elongate element further comprising a stepper motor under control of the controller operatively coupled to the manipulating means to rotate the elongate element.

16. A system as in claim 9, wherein the contact reference point identification system comprises an electrical circuit completed by contact of the;

saw blade and the elongate element.

17. A system as in claim 16, wherein the circuit is a DC circuit.

18. A system as in claim 17, wherein the circuit is an AC circuit.

19. A system as in claim 18, wherein proximity of the saw blade to the elongate element is sensed by induced current from the AC circuit.

20. A system as in claim 16, wherein the contact reference point identification system is configured to quantify one of an asymmetry and an out-of-round condition of the elongate element.

21. A system as in claim 9, wherein the saw blade forms a kerf of less than 0.003 inches.

22. A system as in claim 9, wherein said actuators of the manipulating means comprise calipers turned by stepper motors.

23. A system for forming cuts in a small-diameter elongate element having a lengthwise axis, comprising:

a controller configured to control operation of the system, programable to produce micro-machined elongate elements of desired configurations in diameter sizes usable as catheters and guidewires for invasive medical procedure in a human body;

a clamp configured to engage and release the elongate element under control of the controller;

manipulating means including a pinch roller assembly configured to grasp the elongate element, and move the elongate element along the lengthwise axis and to rotate the elongate element about the lengthwise axis under the control of the controller, further comprising an actuator comprising a stepper motor controlled by the controller configured to rotate the elongate element, and an actuator comprising a stepper motor control led by the controller configured to move the elongate element along the lengthwise axis;

a saw blade configured to form cuts of small dimensions in the elongate element and to be movable toward and away from the elongate element by an actuator comprising a stepper motor turning a caliper under control of the controller;

a contact reference point identification system comprising an electrical circuit configured to provide a signal interperatable by the controller indicating that the saw blade has approached the elongate element and just made contact therewith without appreciable depth of cut to thereby control depth of cut from a contact reference point into the elongate element by the saw blade,

whereby the elongate element can be clamped to hold the elongate element in a fixed position, and a first cut made, then the elongate element is released and moved by being at least one of rotated and moved along and about the lengthwise axis so that second precise cut is made to a desired depth at a desired position in relationship to the first cut.