Title:
SKULL BORING MONITORING DEVICE
Document Type and Number:
Japanese Patent JP3558355
Kind Code:
B2
Abstract:
PURPOSE: To increase the safety and the reliability of the skull opening operation, by extracting only the receiving signal in a specific time width as to a surface acoustic wave transmitting in a skull by an ultrasonic wave, and comparing the received signal with a specific threshold value as well as integrating the signal of the transmitting energy of the surface acoustic wave, so as to control the boring means.
CONSTITUTION: An ultrasonic probe 2a is abutted to the position of a skull 11 decided to be the penetration passage to reach a focus in the skull, a pulse ultrasonic wave is transmitted and received in the skull 11, and the thickness D of the skull 11 is operated by a CPU 15. And depending on the thickness D, a specific threshold value as to the boring depth is set by a threshold value setting unit 7. Then, a hole 2 is opened by a drill 1 while transmitting an ultrasonic wave from one side ultrasonic probe 2a, in the condition providing a pair of ultrasonic probes 2a and 2b on both sides of the drill 1, and only a received signal in a specific time width as to a surface acoustic wave transmitting in the skull 11 is extracted, the transmitting energy of the extracted surface acoustic wave is integrated, and the drill 1 is controlled according to the different value with the specific threshold value.
Inventors:
Hiroshi Kanda
Hiroyuki Takeuchi
Umemura Shinichiro
Tomonaga Masamichi
Hiroyuki Takeuchi
Umemura Shinichiro
Tomonaga Masamichi
Application Number:
JP21478193A
Publication Date:
August 25, 2004
Filing Date:
August 09, 1993
Export Citation:
Assignee:
Hitachi Medical Co., Ltd.
International Classes:
A61B8/00; A61B17/16; G01B17/00; A61B17/00; A61B19/00; (IPC1-7): A61B17/16; A61B8/00
Domestic Patent References:
| JP3224553A | ||||
| JP57099950A | ||||
| JP2192888A | ||||
| JP56137010U |
Attorney, Agent or Firm:
Haruyuki Nishiyama