Determination of the acoustic output of a harmonic scalpel

Koch, Christian; Borys, Michael; Fedtke, Thomas; Richter, Utz; Pohl, B.

doi:10.1109/tuffc.2002.1049734

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…Surgical ultrasound instruments, known as “harmonic scalpels,” have a 40‐ to 80‐kHz vibrating titanium rod with a static clamp member, between which the tissue (and blood vessels) is rapidly coagulated due to localized frictional heating 18 . Another procedure, ultrasound‐assisted liposuction, is widely used in cosmetic surgery for the purpose of removing excessive fat tissue 17 .…”

Section: Therapeutic Applications Of Ultrasound Based On Nonthermal Mmentioning

confidence: 99%

Overview of Therapeutic Ultrasound Applications and Safety Considerations

Miller

Smith

Bailey

et al. 2012

Journal of Ultrasound in Medicine

588

380

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Summary Applications of ultrasound in medicine for therapeutic purposes have been an accepted and beneficial use of ultrasonic biological effects for many years. Low power ultrasound of about 1 MHz frequency has been widely applied since the 1950s for physical therapy in conditions such as tendinitis or bursitis. In the 1980s, high pressure-amplitude shockwaves came into use for mechanically resolving kidney stones, and “lithotripsy” rapidly replaced surgery as the most frequent treatment choice. The use of ultrasonic energy for therapy continues to expand, and approved applications now include uterine fibroid ablation, cataract removal (phacoemulsification), surgical tissue cutting and hemostasis, transdermal drug delivery, and bone fracture healing, among others. Undesirable bioeffects can occur including burns for thermal-based therapies and significant hemorrhage for mechanical-based therapies (e. g. lithotripsy). In all these therapeutic applications for bioeffects of ultrasound, standardization, ultrasound dosimetry, benefits assurance and side-effects risk minimization must be carefully considered in order to insure an optimal benefit to risk ratio for the patient. Therapeutic ultrasound typically has well-defined benefits and risks, and therefore presents a tractable safety problem to the clinician. However, safety information can be scattered, confusing or subject to commercial conflict of interest. Of paramount importance for managing this problem is the communication of practical safety information by authoritative groups, such as the AIUM, to the medical ultrasound community. In this overview, the Bioeffects Committee outlines the wide range of therapeutic ultrasound methods, which are in clinical use or under study, and provides general guidance for assuring therapeutic ultrasound safety.

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Section: Therapeutic Applications Of Ultrasound Based On Nonthermal Mmentioning

confidence: 99%

Overview of Therapeutic Ultrasound Applications and Safety Considerations

Miller

Smith

Bailey

et al. 2012

Journal of Ultrasound in Medicine

588

380

View full text Add to dashboard Cite

show abstract

“…Measurement means are specified in a 1998 IEC standard [197] and are discussed in [198]- [200]. The power is derived from hydrophone measurements, using either a monopole or dipole source model depending on the assumed depth of the vibrating tip in water or tissue.…”

Section: Low-frequency Ultrasound Surgerymentioning

confidence: 99%

“…Future revisions of the IEC standard may incorporate such a procedure. Another aspect of the acoustic output of these devices not covered in [197] is the measurement of airborne ultrasound exposure [200].…”

Section: Low-frequency Ultrasound Surgerymentioning

confidence: 99%

Progress in medical ultrasound exposimetry

Harris

2005

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Biomedical applications of ultrasound have experienced tremendous growth over the past 50 years. Early work in thermal therapy and surgery soon was followed by diagnostic imaging and Doppler. Because patient safety was an important issue from the beginning, the study of methods for measuring exposure levels, and their relationship to possible biological effects, paralleled the growth of the various therapeutic and diagnostic techniques. The diverse conditions of use have presented a range of exposure measurement challenges, and the sensors and techniques used to evaluate ultrasound fields have had to evolve as new or expanded clinical applications have emerged. In this paper some of the more notable of these developments are presented and discussed. Topics covered include devices and techniques, methods of calibration, progress in standardization, and current problem areas, including the effects of nonlinear propagation. Some early methods are described, but emphasis is given to more recent work applicable to present and future uses of ultrasound in medicine and biology.

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“…Ultrasonic scalpels have already reached the level of practical implementation in ordinary surgery [2][3][4][5]. Using an ultrasonic scalpel has the advantages of hemostatic action due to coagulation and the reduction of blood loss during the procedure.…”

Section: Introductionmentioning

confidence: 99%

“…In order to produce hemostatic action, a sufficiently high vibration velocity is needed. The handheld ultrasonic scalpels in practical use operate at vibration speeds of several meters per second to several tens of meters per second [3][4][5]. The vibration system is composed of a bolt-secured vibrator and a metal horn, yielding a sufficient vibration velocity.…”

Section: Introductionmentioning

confidence: 99%

A micro ultrasonic scalpel with modified stepped horn

Kurosawa

Umehara

2012

Elect Comm in Japan

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A transducer for a micro ultrasonic scalpel has been fabricated. The micro ultrasonic scalpel can be used with an endoscope for a nonabdominal operation or microsurgery, for example, through a microscope. The ultrasonic transducer is 9.8 mm long and 2.7 mm wide and has a stepped horn to amplify the vibration velocity; the tip of the horn is 0.6 mm wide. The scalpel operated at the resonance frequency in the longitudinal mode at 278 kHz. The piezoelectric material was lead zirconate titanate (PZT), which was deposited using the hydrothermal method. The vibration velocity at the tip of the horn in the longitudinal direction was 4.0 m/s, with a 40 Vp‐p driving voltage in both of the side electrodes. To demonstrate the beneficial effect of the scalpel, a cutting test in which the transducer was stuck into pork fat was carried out. © 2012 Wiley Periodicals, Inc. Electron Comm Jpn, 95(8): 44–51, 2012; Published online in Wiley Online Library (http://wileyonlinelibrary.com). DOI 10.1002/ecj.10414

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Determination of the acoustic output of a harmonic scalpel

Cited by 15 publications

References 9 publications

Overview of Therapeutic Ultrasound Applications and Safety Considerations

Overview of Therapeutic Ultrasound Applications and Safety Considerations

Progress in medical ultrasound exposimetry

A micro ultrasonic scalpel with modified stepped horn

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