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Mechanical positioner for mri guided ultrasound therapy system

A magnetic resonance imaging and positioning device technology, applied in the direction of ultrasound therapy, treatment, surgical instrument support, etc., can solve problems such as limiting positioning accuracy

Inactive Publication Date: 2004-01-07
INSIGHTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of the helical sensor and especially the gimbal in the system compounded the aforementioned motor backlash problem, thus further limiting the positioning accuracy achievable by the system
In addition, the motor transmission in this patent is made of magnetic materials, so it must also be placed at a certain distance from the imaging space to eliminate interference with the MRI system

Method used

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  • Mechanical positioner for mri guided ultrasound therapy system
  • Mechanical positioner for mri guided ultrasound therapy system
  • Mechanical positioner for mri guided ultrasound therapy system

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0025] figure 1 It is an ultrasonic treatment system 20 of the present invention. The ultrasonic treatment system 20 is based on the MRI guidance system to accurately guide the doctor to the predetermined treatment position. The ultrasonic therapy system 20 includes an MRI frame 32 for supporting a positioning device 30 and a motor frame 40 . The positioning device 30 is used to guide energy from ultrasonic or other energy sensors. The positioning device 30 is installed in a sealed housing, and the motor frame 40 encloses four positioning motors 42 , 44 , 46 and 48 . Motors 42, 44, 46 and 48 each provide rotational motion to the drive shaft, and each motor is responsible for controlling a respective direction of motion of positioning device 30 (eg, lateral, longitudinal, rolling or oblique). The vertical position of the ultrasonic energy is electronically controlled by changing the focus of the ultrasonic transducer. Preferably, as described in more detail below, motors 42...

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PUM

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Abstract

An ultrasound therapy system utilizes a mechanical positioning assembly to locate and aim an ultrasonic transducer. The positioner provides for roll and pitch control as well as control in the lateral and longitudinal directions. The positioner uses piezo-electric vibrational motors that can effectively operate within the field of an MRI system without interfering with its operation. The motors are capable of providing a breaking force to the drive shafts while de-energized and thus aid in preventing motor slippage or backlash. Since the motors do not affect the operation of an MRI system, the ultrasonic therapy system can be made more compact. Two sets of position encoders are used to align the positioner. Course absolute encoders and fine relative encoders are both coupled to the positioning motors and allow for precise control over the position and orientation of the ultrasonic transducer.

Description

technical field [0001] The present application relates to a mechanical positioning system, in particular to a positioning system for ultrasonic treatment equipment guided by magnetic resonance imaging. Background technique [0002] The use of magnetic resonance imaging (MRI) is well known. MRI provides X-ray researchers with a detailed internal view of a patient's body structures that cannot be seen with traditional X-ray techniques. The images produced by the MRI system provide doctors with sharp contrast between changing tissues and are very useful in planning surgical procedures. [0003] Ultrasound therapy focuses on applying heat to selectively destroy tumors or other abnormal tissue. Heating tissue above a certain temperature for a period of time can cause necrosis, destroying the tissue. The focus of MRI imaging applications is on ultrasound therapy equipment. For example, US Patent Nos. 5,443,068, 5,275,165 and 5,247,935 all describe ultrasound transducers guided...

Claims

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Application Information

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IPC IPC(8): A61B19/00A61B18/00A61N7/00
CPCA61B2019/5236A61N7/00Y10S977/725Y10S128/916Y10S977/929A61B19/26A61B90/50A61B2090/374
Inventor O·耶赫滋科里D·弗罗恩德里奇N·马根C·马兰茨Y·梅丹S·维特克A·温雷斯
Owner INSIGHTEC