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A newly developed "Single-Valved Assist Device"-A combined pump for bypass and counterpulsation.

Research Project

Project/Area Number 60570649
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Thoracic surgery
Research InstitutionJichi Medical School

Principal Investigator

KIMURA Sosuke  Associate, Dept. of Thorac. & Cardiovasc. Surg., JMS., 医学部, 講師 (30118450)

Co-Investigator(Kenkyū-buntansha) FUKUSHIMA Kanae  Associate, Dept. of Thorac. & Cardiovasc. Surg., JMS, 医学部, 講師 (90049023)
HARADA Mikio  Assistant, Dept. of Thorac. & Cardiovasc. Surg., JMS, 医学部, 助手 (30156517)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsLeft Heart Bypass / Counterpulsation / Systolic Unloading / Tension Time Index / Man-machine interaction
Research Abstract

Lacking in the sufficient reduction of the pressure work of left ventricle, the partial LA-Ao bypass (LHB) should have some limits in assisting the failing heart. The addition of counterpulsation (Cp) could reduce the tension time index (TTI), but yielded a complicated interaction between the bypass and Cp. From this viewpoint, we developed a single unit device possessing both functions.
The device (SVAD) is composed of a pulsatile chamber and a single valve at the inflow portion. It functions as a bypass pump with a massive regurgitation in the outflow. Under the synchronized use, this regurgitation, though lowering the efficiency of the bypass, makes a strong systolic unloading.
Using 8 dogs, the effects of SVAD on the left heart failure (AoP<100mmHg, LAP>12mmHg, CVP=4.5-10cm <H_2> 0, HR=80/min) were examined, comparing with the conventional LHB under the same flow assist.
Total of 56 experiments were performed and analyzed. In TTI, SVAD showed a distinct reduction of -20%, while -4% by LHB. In accordance with the increase of the bypassflow, SVAD showed a gradual and sufficient decrease in TTI, while LHB showed almost no change until the bypass rate reached to the total. Diastolic pressre time index / TTI was 2.1 and 1.6, respectively, under the assist.
SVAD is a simple and doubly functioning assist device, having a favorable effect for the restoration of the natural heart by the TTI reduction.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 木村壮介: 日本胸部外科学会誌. 7月号. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 木村壮介: 日本心臓血管外科学会雑誌. 16. 299-301 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Sosuke Kimura: "A newly developed "Single-Valved Assist Device"- A combined pump for bypass and counterpulsation." The journal of the japanese association for thoracic surgery.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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