Document Detail

Performance Increase in Venous Drainage for Mini-Invasive Heart Surgery: Superiority of Self-Expanding Cannulas.
MedLine Citation:
PMID:  25084247     Owner:  NLM     Status:  Publisher    
OBJECTIVE: Originally, the Smartcanula principle (collapsed insertion and expansion in situ) was developed for venous drainage by gravity. However, in minimally invasive surgery, augmentation with either constrained force vortex pumps or vacuum is often used. The current study was set up to assess whether smaller diameters of self-expanding venous cannulas are sufficient in conjunction with venous drainage augmentation resulting in smaller access orifices.
METHODS: To evaluate cannulas intended for cardiopulmonary bypass, an in vitro circuit was set up with silicone tubing between the test cannula encased in a lower reservoir, the centrifugal pump, and after an upper reservoir. Afterload was set arbitrarily at 60 mm Hg using a centrifugal pump. The pressure value was measured using Millar pressure transducers. Flow rate (Q) was measured using an ultrasonic flow meter calibrated with volume tank and timer. Revolutions per minute of the centrifugal pump were calibrated with a stroboscope. Data display and data recording were controlled using a Lab View application. Self-expanding (24F Smartcanula) and control (25F Biomedicus) cannulas were used.
RESULTS: Sixty measurements were recorded. At pump speed of 1500, 1570, 2000, 2500, and 3000 rpm, the Q values were 3.6, 5.2, 6.6, 9.3, and 11.8 L/min for the 24F self-expanding cannula and 3, 4.3, 5.4, 7.5, and 9.3 L/min for the control cannula. The pressure values were 3.6, -5.4, -15.9, -45.3, and 80.6 mm Hg. Biomedicus 25F showed Q values from 16% to 19% less as compared with 24F Smartcanula. The pressure values were 6, 7, 4, 2, and 2 times more as compared with 24F Smartcanula.
CONCLUSIONS: Our experimental evaluation demonstrated the superior performance of the Smartcanula with its self-expanding design in comparison with the reference commercially available standard cannulas. The Smartcanula with its small diameter is particularly welcome for minimally invasive surgery.
Mhedi Belkoniene; Saad Abdel-Sayed; Julien Favre; Ludwig-Karl von Segesser
Related Documents :
23419147 - Hypovolemia in extracorporeal life support can lead to arterial gaseous microemboli.
6339167 - Intraesophageal pressure monitoring in infants with respiratory disorders.
15914307 - The cardiopulmonary effects of physical restraint in subjects with chronic obstructive ...
3297017 - Plasma volume and endocrine responses to water immersion with intermittent positive-pre...
648207 - Effectiveness of oxygen therapy in hypoxic polycythemic smokers.
20708107 - Modulation of cardiorespiratory function mediated by the paraventricular nucleus.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-7-31
Journal Detail:
Title:  Innovations (Philadelphia, Pa.)     Volume:  -     ISSN:  1559-0879     ISO Abbreviation:  Innovations (Phila)     Publication Date:  2014 Jul 
Date Detail:
Created Date:  2014-8-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101257528     Medline TA:  Innovations (Phila)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Transcervical Wedge Resection After Transcervical Extended Mediastinal Lymphadenectomy.
Next Document:  Nonintubated Thoracoscopic Pulmonary Nodule Resection Under Spontaneous Breathing Anesthesia With La...