ABSTRACT
Objective:To evaluate the accuracy of an ultrasound-guided robot-assisted system for percutaneous facet joint puncture in an animal experiment by registration of ultrasound images and two-dimensional X-ray fluorescence images.Methods:Six specimens of fresh adult sheep lumbar spine were prepared and soaked in gelatin solution. The specimens contained a total of 48 facet joints with 24 ones respectively on the left and right sides. Half of the joints were assigned by the random number table method into a robot-assisted group which were subjected to percutaneous facet joint puncture assisted by the ultrasound-guided robot-assisted system while the contralateral ones into a freehand group which were subjected to percutaneous facet joint puncture by freehand. In the robot-assisted group, the left facet joints were 3 L 1, 3 L 2, 3 L 3 and 3 L 4 ones while the right facet joints were 2 L 1, 3 L 2, 5 L 3 and 2 L 4 ones. In this self-control animal experiment, both the robot-assisted punctures and the freehand punctures were carried out in the same specimen. The puncture success rate, puncture needle adjustment, positioning deviation, orientation deviation and operation time were recorded. Results:The positioning deviation and orientation deviation in the robot-assisted group [(2.21 ± 1.12) mm and 1.51° ± 0.47°] were significantly lower than those in the freehand group [(3.26 ± 1.44) mm and 2.24° ± 0.89°] ( P < 0.05). All the articular facet joint punctures were successfully accomplished for the first time in the robot-assisted group while those required multiple adjustments in the freehand group. In the robot-assisted group, the total operation time [(463.84 ± 34.93) s] was significantly longer than that in the freehand group [(298.40 ± 27.48) s], but the puncture time [(37.97 ± 6.87) s] was significantly shorter than that in the freehand group [(261.61 ± 33.15) s] ( P < 0.05). Conclusion:The ultrasound-guided robot-assisted system for percutaneous facet joint puncture can lead to accurate puncture with limited needle adjustments.
ABSTRACT
The purpose is to introduce the structure and principle of the high intensity focused ultrasound and to discuss its value and future development in tumor. The high intensity focused ultrasound uses the biological heat effect which focuses the high intensity ultrasound on the lesions to destroy them. It is non-invasive means to destroy the lesions, reduce the damage of the normal tissues greatly, improve the quality of life..With the development, application and popularization of the technology on high intensity focused ultrasound, it will serve the human health career better.
ABSTRACT
Ultrasound is over 20 khz, which represents the upper frequency limit of human hearing. Acoustic vibrations are generated when piezoelectric materials on the thin disc-shaped transducers expand and contract. Although low frequency ultrasound devices have been used widely in the dermatologic area for a long time, the mechanism and side effects have been overlooked. A low-frequency ultrasound device has many benefits on the cosmetic dermatology area by thermal effect, vibration effect, and increase of transdermal delivery of lipophilic drugs or cosmetics. However, there have been reports of dermatitis, dyspnea, dizziness, and burns after treatment with ultrasound. Therefore, the use of this device should be under a doctor's supervision.
Subject(s)
Humans , Acoustics , Burns , Contracts , Cosmetics , Dermatitis , Dermatology , Dizziness , Dyspnea , Hearing , Organization and Administration , Transducers , Ultrasonics , VibrationABSTRACT
An ultrasonic device for medical skin care is used to gently exfoliate the skin of dead skin cells and impurities. Ultrasound waves help loosen and remove oil, dirt and cellular debris from pores. Ponophoresis or sonophoresis is the use of ultrasound to increase percutaneous absorption of drugs, serums, lotions, creams and masques to a depth where it is more effective and beneficial. For improved results and safer procedures, we need to know the contraindications and adverse effects of ultrasonic treatments. Therefore, we summarized and reviewed the issue of safety including contraindications, cautions, and adverse events.
Subject(s)
Skin , Skin Absorption , Skin Care , UltrasonicsABSTRACT
High intensity focused ultrasound (HIFU)is a new technology of focal therapy for patients with hepatic carcinoma.Comparing with operation and other focal therapeutic methods (such as radiofrequency and transcatheter arterial chemoembolization) of liver cancer,HIFU is non-invasive,accurate,and definite in killing the tumor tissue with fewer complications.Thus,it is widely accepted in clinical settings and has a promising prospect.In this article,we review the mechanism and present situation of hepatic carcinoma therapy with HIFU and dicuss some clinical application and development in the future.