Cardiopulmonary bypass for less invasive procedures

Toomasian, John M

doi:10.1177/026765919901400407

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…Once the entrained air gets into the centrifugal pump, the air is broken into smaller bubbles, which are small enough to pass through the size of arterial filter pores. This suggests that air should be eliminated from the circuit proximal to the centrifugal pump (3,4).…”

Section: Introductionmentioning

confidence: 99%

Closed Circuit Cardiopulmonary Bypass with Centrifugal Pump for Open‐Heart Surgery: New Trial for Air Removal

et al. 2000

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The purpose of this study is to examine the efficiency of venous air removal with a new cardiopulmonary bypass (CPB) circuit design for conventional open-heart surgeries. A main concern with a closed circuit for open-heart surgeries is air entrainment into the venous line. A venous filter was placed proximal to the centrifugal pump. The circuit proximal to the centrifugal pump was divided into two lines; one line was attached to the venous reservoir outlet. By clamping the line to the reservoir, this circuit becomes closed. Negative pressure was applied to the purge line connected to the venous reservoir for venous air removal. Micro bubbles were measured at two locations, both distal to the venous and arterial filters. When the injection rate reached 100 ml/min, with the air-injection over 30 s, micro bubbles greater than 40 micro were observed at the outlet of venous filter. However, there was no micro bubble greater than 40 micro detected at the outlet of arterial filter. Although micro bubbles greater than 40 micro were not detected at the outlet of the arterial filter up to the injection rate of 300 ml/min, when the injection rate reached 400 ml/min, micro bubbles greater than 50 microm were detected distal to the arterial filter. From this examination, we determined that air entrained in the venous line up to approximately 300 ml/min is automatically removed by this method with the pressure-balanced condition. This pressure balance means that resistance of venous return, gravity siphon, negative pressure by centrifugal pump, and negative pressure applied to the air-purge line of the filter are balanced; that is, the venous return is sufficient, and the venous reservoir volume is kept stable. From this study we determined that this circuit design efficiently removes the entrained air in the venous line.

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Section: Introductionmentioning

confidence: 99%

Closed Circuit Cardiopulmonary Bypass with Centrifugal Pump for Open‐Heart Surgery: New Trial for Air Removal

et al. 2000

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“…Although the surgical approach has become less invasive, technological aspects of cardiopulmonary bypass (CPB) have not improved significantly to be considered less invasive. VAVD brings certain benefits to CPB such as adequate venous drainage with a smaller cannula, better control of CPB, and possible prime volume reduction with shorter circuit lines (3)(4)(5)(6). However, it is still inevitable that CPB blood contacts open air as long as an open venous reservoir is used in the circuit.…”

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confidence: 99%

Development of a Completely Closed Circuit Using an Air Filter in a Drainage Circuit for Minimally Invasive Cardiac Surgery

Matayoshi¹,

Yozu

Morita³

et al. 2000

Artificial Organs

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The completely closed circuit system is the future direction of cardiopulmonary bypass because of its compactness and superior biocompatibility. The most serious obstacle for clinical application is the sucking of air bubbles into the drainage circuit. The purpose of this study was to remove the air bubbles from the drainage circuit. Infusing 50 ml/min of air bubbles into the drainage circuit of the usual closed circuit, and infusing 50, 100, and 150 ml/min of air into the drainage circuit of a newly developed closed circuit (drainage circuit using an air filter), the number and size of air bubbles were observed at the outlet of the arterial filter. In the usual closed circuit, many air bubbles of over 40 microm were detected within 5 s at a blood flow of 4 L/min because the centrifugal pump decreased the size of the bubbles, which then passed through the oxygenator and arterial filter. Air bubbles of over 40 micro were not detected in the newly developed closed circuit within 5 min at a blood flow of 4 L/min. The removal of air mixed into the completely closed circuit was possible with a drainage circuit using an air filter that was developed. The clinical use of the completely closed circuit for minimally invasive cardiac surgery (MICS) became possible based on this development.

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Minimally Invasive Surgery in Pediatric Cardiac Surgery

Black¹

2005

Pediatric Minimal Access Surgery

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Cardiopulmonary bypass for less invasive procedures

Cited by 3 publications

References 45 publications

Closed Circuit Cardiopulmonary Bypass with Centrifugal Pump for Open‐Heart Surgery: New Trial for Air Removal

Closed Circuit Cardiopulmonary Bypass with Centrifugal Pump for Open‐Heart Surgery: New Trial for Air Removal

Development of a Completely Closed Circuit Using an Air Filter in a Drainage Circuit for Minimally Invasive Cardiac Surgery

Minimally Invasive Surgery in Pediatric Cardiac Surgery

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