Spring-Mass Surgical System

• US 20070129732A1
• Filed: 11/28/2005
• Published: 06/07/2007
• Est. Priority Date: 11/28/2005
• Status: Abandoned Application

• Current Assignee: Jaime Zacharias
• Original Assignee: Jaime Zacharias
• Inventors: Zacharias, Jaime
• Application Number:
  US11/164,507
• Publication Number:
  US 20070129732A1
• Time in Patent Office: Days
• US Class Current: 606/107
• CPC Class Codes: A61B 17/22004 using mechanical vibrations, e.g. ultrasonic shock waves A61B17/225 takes precedence
• CPC Class Codes: A61B 17/320783 through side-hole, e.g. sliding or rotating cutter inside catheter
• CPC Class Codes: A61B 2017/22011 Combined types of vibration, e.g. ultrasonic and electrohydraulic
• CPC Class Codes: A61B 2017/22027 Features of transducers
• CPC Class Codes: A61B 2017/32004 having a laterally movable cutting member at its most distal end which remains within the contours of said end
• CPC Class Codes: A61B 2017/32007 with suction or vacuum means
• CPC Class Codes: A61F 9/00763 with rotating or reciprocating cutting elements, e.g. concentric cutting needles atherectomy cutting instruments A61B17/3207; endoscopic cutting instruments A61B17/320016

Abstract

A high-speed surgical handpiece (10) of the kind suitable for vitreoretinal surgery having a cutter (44) and an actuator (310). The cutter (44) is a guillotine-type cutter activated by a spring-mass system excited at harmonic frequency by a piezoelectric actuator (310) that receives a driving signal from a driving controller. The controller can have control and display units with a plurality of input mechanisms receiving input from a user. The control unit produces a piezoelectric actuator output signal to excite the spring-mass system at harmonic frequency. Fast cutting rates with reduced duty cycle as well as a proportional mode of operation are available. Low degrees of vibration and noise generation are produced.

Claims

1. A spring-mass based piezoelectric surgical system, comprising:

a surgical instrument actuated by oscillatory motion;

wherein

said oscillatory motion is produced by a spring-mass system oscillating proximate a harmonic frequency of the spring-mass system and at least one piezoelectric actuator coupled thereto, said at least one piezoelectric actuator actuated proximate said harmonic excitation frequency of said spring-mass system.

2. The system of claim 1, further comprising:

said spring-mass system; and

said at least one piezoelectric actuator coupled thereto.

3. The system of claim 2, further comprising:

a surgical handpiece coupled to said surgical instrument, comprising said spring-mass system and said at least one piezoelectric actuator.

4. The surgical system of claim 3, further comprising:

a surgical handpiece controller system coupled to and controlling said surgical handpiece and said surgical instrument.

5. The system of claim 1, said surgical instrument comprising a guillotine-based vitrectomy probe.

6. The system of claim 1, said piezoelectric actuator comprising a parallel pre-stressed piezoelectric actuator.

7. The system of claim 1, said piezoelectric actuator comprising an amplified piezoelectric actuator.

8. The system of claim 3, said surgical handpiece further comprising sensor means to detect a linear displacement produced by said piezoelectric actuator.

9. The system of claim 3, said surgical handpiece further comprising sensor means to detect the linear displacement produced by the spring-mass system.

10. The system of claim 3, said surgical handpiece further comprising axial vibration canceling means for canceling axial vibrations.

11. The system of claim 1, wherein said system is operable in closed-loop servo control modality.

12. The system of claim 5, said guillotine based vitrectomy probe comprising open sideport area adjusting means for adjusting an open sideport area of said guillotine based vitrectomy probe.

13. The system of claim 12, said open sideport area adjusting means further comprising a linear actuator.

14. A method for powering a surgical instrument comprising using a piezoelectric actuator driving a spring-mass system at a harmonic excitation frequency of said spring-mass system for powering said surgical instrument.

15. The method of claim 14, said surgical instrument comprising a vitrectomy probe.