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Bulldog Clamp Pressure Calculator
Palm(TM) Version:
Model to Calculate Pressure transmission by a Laparoscopic Bulldog Clamp during Laparoscopic Radical Prostatectomy
Sijo J. Parekattil and Inderbir S. Gill.
Objective: During laparoscopic radical prostatectomy, we utilize an atraumatic 25mm bulldog clamp (CEV 565, MicroFrance Medtronic Xomed, Jacksonville, Fla.) for the control of the lateral vascular pedicles to the prostate. Our goal was to design a model to calculate the pressure (in mmHg) transmitted to tissue between the jaws of this clamp. Such a model may promote our understanding of optimal clamp placement on the vascular pedicle.
Methods: A load cell linked to a voltage transducer was utilized to record the pressure generated between the clamp jaws. Standardized weights were utilized to convert the voltage readings into gram weight equivalents. The area under the clamp jaws was calculated to be 77.2 mm2. This was used to calculate pressure applied in mmHg. The pressure applied by the clamp was measured from a thickness of 0mm up to 10mm in 1mm increments. Readings were obtained on three runs and then the results were averaged. The results were then used to generate a line of best fit to calculate the pressure in mmHg at various thickness levels. The measurements were performed at two positions along the length of the clamp – at the tip and at the midpoint of the jaws. These readings were then synthesized to generate a linear model that would calculate the pressure applied by the clamp based on the thickness level and position along the length of the jaws.
Results: Best fit linear relationships were identified between pressure applied at the tip and mid- point along the jaws and at thicknesses from 0-10mm. A linear model was designed to calculate the actual pressure in mmHg at any thickness level and at any length along the jaws.
Conclusion: This model calculates the least pressure in mmHg generated by the laparoscopic bulldog clamp at any specified length along the jaws and at any thickness level between 0-10mm. This model may provide insight for optimal clamp placement on the vascular pedicle during a laparoscopic radical prostatectomy.
Download Instructions: Click on the link below to download the program. If you download the file onto the computer which is used to synchornize with your device, the installer program will automatically initiate once you click on the file after it is downloaded.
This software is only intended for research and development purposes. It is to be used only by physicians, residents in training or medical students.
THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTY OF MERCHANTABILITY , FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT OR FREEDOM FROM VIRUSES OR OTHER CODE DEFECTS. THE AUTHOR EXPRESSLY DISCLAIMS LIABILITY FOR ERRORS OR OMISSIONS IN THE PROGRAM. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR DAMAGES OF ANY KIND, INCLUDING WITHOUT LIMITATION, DIRECT OR INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, CLAIMS, LOSSES OR EXPENSES (WHETHER IN TORT, CONTRACT OR OTHERWISE) ARISING OUT OF OR IN CONNECTION WITH THE USE OF THIS PROGRAM.
No part of this program may be copied or otherwise reproduced in any way without express written consent from the author: Sijo J. Parekattil, M.D.
By downloading the following program, the user accepts the above terms and conditions of use.
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