Operation device

• US 5,180,363 A
• Filed: 12/23/1991
• Issued: 01/19/1993
• Est. Priority Date: 04/27/1989
• Status: Expired due to Fees

• Current Assignee: Sumitomo Bakelite Company Limited
• Original Assignee: Sumitomo Bakelite Company Limited
• Inventors: Noguchi, Yasuo, Idemoto, Morito, Inoue, Naohiko
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): ZELE, KRISTA MICHELLE
• Application Number:
  US07/813,053
• Time in Patent Office: 393 Days
• Field of Search: 128/24 AA, 128/ 41, 604/22, 604/27, 604/44, 73/1 DV, 606/37-39, 606/45, 606/169, 606/170, 606/171, 606/172, 310/316, 310/317, 310/318, 310/319, 310/325
• US Class Current: 604/22
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2017/32007 with suction or vacuum means
• CPC Class Codes: A61B 2017/320074 blade
• CPC Class Codes: A61B 2017/320078 Tissue manipulating surface
• CPC Class Codes: A61B 2017/32008 preventing clogging of suction channel
• CPC Class Codes: A61B 2017/320089 node location
• CPC Class Codes: A61B 2018/00011 with fluids
• CPC Class Codes: A61B 2217/007 with irrigation system
• CPC Class Codes: A61F 9/00745 using mechanical vibrations, e.g. ultrasonic
• CPC Class Codes: A61M 3/0279 Cannula; Nozzles; Tips; their connection means
• CPC Class Codes: B06B 1/0253 taken directly from the generator circuit
• CPC Class Codes: B06B 2201/76 Medical, dental
• CPC Class Codes: B06B 3/00 Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency

Abstract

A surgical operation device comprising an ultrasonic piezoelectric transducer for generating ultrasonic vibrations, an oscillation feedback type oscillator for supplying high-frequency power to the ultrasonic transducer, a vibration transmitter connected to the ultrasonic transducer for transmitting and amplifying mechanical vibrations at an ultrasonic frequency, a suction unit and an irrigator. The ultrasonic transducer includes a bolted Langevin type transducer. The feedback circuit of the oscillation feedback type oscillator includes an oscillation voltage detector, a phase comparator, a low pass filter, a differential amplifier, and a voltage controlled oscillator. Thus, the mechanical resonant frequency can be traced in a wide range of fluctuations of a load on the vibration transmitter during vibration and vibrations can start an appropriate mechanical resonate frequency irrespective of the load status of the vibration transmitter at the start-up.

Claims

1. A surgical operation device comprising:

an ultrasonic piezoelectric transducer means for generating ultrasonic vibrations;

an oscillation feedback type oscillator means for supplying high-frequency power to the piezoelectric transducer means;

an ultrasonic vibration transmitter means connected to the piezoelectric transducer means for transmitting and amplifying the ultrasonic vibrations generated by the piezoelectric transducer means;

a sucking unit; and

an irrigator;

wherein the piezoelectric transducer means includes a bolted Langevin type transducer;

wherein the oscillation feedback type oscillator means comprises a feedback circuit which includes a PLL and an oscillation voltage detector engaged to an input of said PLL for generating a feedback oscillation signal for input into the oscillation voltage detector, said PLL including a phase comparator, a low pass filter, a differential amplifier, and a voltage controlled oscillator connected in series to produce the feedback oscillation signal, and

wherein said oscillation voltage detector includes a motional bridge, a base clipper, a voltage adjuster and an input level converter connected in series for input into said PLL, wherein said motional bridge has a branch including said Langevin type transducer driven by the feedback oscillation signal and a second branch including capacitors.

2. A surgical operation device according to claim 1, wherein the Langevin type transducer includes a stack of alternating ring-like electrorestrictive elements and ring-like electrodes one larger in number than the electrostrictive elements and connected electrically in parallel, a pair of insulators holding the stack therebetween, a pair of metal blocks placed outside the corresponding insulators and a bolt tightening said electrostrictive elements by extending through the center of said electrostrictive elements.

3. A surgical operation device according to claim 2 wherein the insulators each include a ceramic material having an electrical resistance higher than 10¹³ Ω

cm.

4. A surgical device according to claim 1, wherein the ultrasonic vibration transmitter means includes a connection portion which comprises a stem portion of a constant cross-sectional area and a tapering portion extending from the stem portion, an operation section, and means for removably connecting the operation section to the tapering portion wherein a maximum point of internal stress produced by the ultrasonic vibrations occurs at a junction between the stem portion and the tapering portion and a maximum amplitude of the ultrasonic vibrations occurs at a free end of the operation section.

5. A surgical operation device according to claim 4, wherein said means for removably connecting the tapering portion and said operation section includes a screw thread.

6. A surgical operation device according to claim 4, wherein the connection portion and the operation section each have a fluid path extending therethrough.

7. A surgical, operation device according to claim 6, wherein a cross sectional area of the fluid path in the connection portion is equal to, or larger than, that of the fluid path in the operation section.

8. A surgical operation device according to claim 4, wherein a density of the material of the connection portion is equal to, or higher than, a density of the material of the operation section.

9. A surgical operation device according to claim 4, wherein a forward portion of the operation section is bent at an angle in the range from 5 to 120 degrees to the longitudinal axis of the connection portion.

10. A surgical operation device according to claim 1, wherein the ultrasonic vibration transmitter means includes an operation section with a blade portion adapted to contact an organism and has a fluid path extending therethrough, one end of the path being open in the operation section.

11. A surgical operation device according to claim 10, wherein the ultrasonic vibration transmitter means includes a connection portion extending in the same direction as the ultrasonic vibrations.

12. A surgical operation device according to claim 10, wherein said operation section includes an end operation portion which extends at an angle to the direction of the ultrasonic vibrations.

13. A surgical operation device according to claim 10, wherein the ultrasonic vibration transmitter means includes a connection portion extending at an angle to the direction of the ultrasonic vibrations.

14. A surgical operation device according to claim 1, including a handpiece and a switch provided on a side of said handpiece, said handpiece including the bolted Langevin type transducer and the ultrasonic vibration transmitter means.

15. A surgical operation device comprising:

an ultrasonic piezoelectric transducer means for generating ultrasonic vibrations;

an oscillation feedback type oscillator means for supplying high-frequency power to the piezoelectric transducer means;

an ultrasonic vibration transmitter means connected to the piezoelectric transducer means for transmitting and amplifying the ultrasonic vibrations generated by the piezoelectric transducer means;

wherein the piezoelectric transducer means includes a bolted Langevin type transducer;

wherein the oscillation feedback type oscillator means includes a feedback circuit which comprises means for widely tracing the ultrasonic vibrations in accordance with load fluctuation and

wherein said means for widely tracing includes an oscillation voltage detector, a motional bridge, a base clipper, a voltage adjuster and an input level converter, said motional bridge having a first branch including said Langevin type transducer and a second branch including capacitors.

16. A surgical operation device comprising:

an ultrasonic piezoelectric transducer means for generating ultrasonic vibrations;

an oscillation feedback type oscillator means for supplying high-frequency power to the piezoelectric transducer means;

a vibration transmitter means connected to the piezoelectric transducer means for tnramsitting and amplifying the ultrasonic vibrations generated by the piezoelectric transducer means;

wherein the piezoelectric transducer includes a bolted Langevin type transducer;

wherein the oscillation feedback type oscillator means includes a feedback circuit which comprises means for providing a stabilized feedback signal irrespective of a state of a load on said piezoelectric transducer means and

wherein said means for providing a stabilized feedback signal includes an oscillation voltage detector, a motional bridge, a base clipper, a voltage adjuster and an input level converter, said motional bridge having a first branch including said Langevin type transducer driven by the stabilized feedback signal and a second branch including capacitors.