Experimental evaluation of an endoscopic ultrasound probe: In vitro and in vivo canine studies

Silverstein, Fred E.; Martin, Roy W.; Kimmey, Michael B.; Jiranek, Geoffrey C.; Franklin, D.; Proctor, A.

doi:10.1016/0016-5085(89)91623-5

Cited by 105 publications

(29 citation statements)

References 13 publications

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“…When the gallbladder is extracted to the right side, this radial-type probe can easily scan the plane containing Calot's triangle, thereby allowing visualization of the cystic duct as well as the common ducts [12]. Fig.…”

Section: Discussionmentioning

confidence: 99%

A miniature probe enables clear demonstration of the cystic duct during laparoscopic cholecystectomy

et al. 1998

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We performed intraoperative ultrasonography with a miniature probe to explore the biliary anatomy, especially the cystic duct, during laparoscopic cholecystectomy. By using this radial-type probe introduced into a hard metal sheath with a balloon at the end, the plane containing Calot's triangle can be scanned easily when the gallbladder is extracted to the right side, thereby facilitating the identification of the cystic duct as well as the common ducts. In 30 cases, no common duct stone was found and the cystic duct was clearly identified. This radial-type miniature probe can be used to locate the cystic duct and avoid inadvertant incision or division of the common ducts.

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Section: Discussionmentioning

confidence: 99%

A miniature probe enables clear demonstration of the cystic duct during laparoscopic cholecystectomy

et al. 1998

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“…The probe rotates through 360u within this balloon window to form an image of the airway and its surrounding structures, in the same way as a radar screen on a ship. The 20 MHz EBUS probe has a penetration depth of up to 2 cm, which has been determined to provide the optimum resolution with sufficient airway-wall image penetration [9]. If the technique is to be validated for assessment of nonmalignant conditions, such as airway wall thickening in asthma, possible distortions introduced by balloon inflation become important.…”

mentioning

confidence: 99%

Endobronchial ultrasound to assess airway wall thickening: validationin vitroandin vivo

Shaw

Wakely²,

Peebles³

et al. 2004

Eur Respir J

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Endobronchial ultrasound (EBUS) allows identification of airway wall structures and could potentially be utilised for in vivo studies of airway thickening in asthma. The present study investigated whether inflation of the fluid-filled balloon sheath over the transducer (necessary to provide sonic coupling with the airway wall) influenced in vitro measurements. In vivo comparability of EBUS with high resolution computed tomography scanning (HRCT), an established method for measuring wall thickness, was determined in control subjects.The airway diameter and wall thickness were studied using EBUS in 24 cartilaginous airways obtained from four sheep, before and after balloon sheath inflation during immersion in saline. To assess EBUS versus HRCT comparability of airway measures in vivo, 12 control subjects underwent imaging of the posterior basal bronchus of the right lower lobe by both techniques. Intra-and interobserver agreement were also assessed.Results with and without the balloon sheath gave comparable measures of airway internal diameter and wall thickness in vitro. Statistical analysis showed agreement between EBUS and HRCT, and intra-and interobserver variability in vivo.The current study concludes that endobronchial ultrasound, which does not present a radiation risk, could be utilised in the in vivo study of cartilaginous airway wall remodelling in respiratory diseases, such as asthma.

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“…It is included in a small imaging probe used with an endoscope for imaging the gastrointestinal wall [15][16][17]. Construction of this drive cable is shown in Fig.…”

Section: Flexible Drive Cablesmentioning

confidence: 99%

“…The copper type is less expensive but the cost of either would be a major problem in disposable or short life ultrasonic catheters. A second microcoax (Gore and Associates, Huntington Beach, CA, model CXN-1562) that we have used [15][16][17]23] is illustrated in Fig. 6.…”

Section: Electrical Wire For Connecting the Transducermentioning

confidence: 99%

Design characteristics for intravascular ultrasonic catheters

Martin

Johnson

1989

Int J Cardiac Imag

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Several factors are important in the design of intracoronary ultrasonic imaging catheters. The mechanical considerations are first discussed and equations are developed for calculating the forces affecting catheter passage in a blood vessel. These equations are applied to the problem of Judkins (transfemoral) coronary artery catheterization, using previously described anatomical information and catheter moduli values. The introduction force is calculated for each position along the vessel for both a high and low value of estimated catheter-wall friction (coefficient values of 0.04 and 0.2, respectively). Next, the problem of catheter or transducer rotation is analytically described. The advantages of spiral drive cables with high torsional rigidity and low bending stiffness are numerically shown. Finally, several methods and considerations are given for electrical connection to the transducer. These results and equations should facilitate the design of intracoronary ultrasound imaging devices in the future.

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Experimental evaluation of an endoscopic ultrasound probe: In vitro and in vivo canine studies

Cited by 105 publications

References 13 publications

A miniature probe enables clear demonstration of the cystic duct during laparoscopic cholecystectomy

A miniature probe enables clear demonstration of the cystic duct during laparoscopic cholecystectomy

Endobronchial ultrasound to assess airway wall thickening: validationin vitroandin vivo

Design characteristics for intravascular ultrasonic catheters

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