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Volume 19 (1990)
- Issue 6 Pages 1497-
- Issue 5 Pages 1459-
- Issue 4 Pages 1401-
- Issue 3 Pages 995-
- Issue 2 Pages 647-
- Issue 1 Pages 1-
Volume 19, Issue 4
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1990 Volume 19 Issue 4 Pages 1401
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
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[in Japanese]1990 Volume 19 Issue 4 Pages 1403-1407
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
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Yukihiko NOSE, Ryuji TOMINAGA, Setsuo TAKATANI1990 Volume 19 Issue 4 Pages 1408-1413
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
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Tschong-Su LIE1990 Volume 19 Issue 4 Pages 1414-1422
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
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S TAKESAWA1990 Volume 19 Issue 4 Pages 1423-1426
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
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R TABATA, S WATARIDA, M ONOE, S SHIRAISHI, S MATSUNO, A MARL1990 Volume 19 Issue 4 Pages 1427-1431
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
JOURNAL FREE ACCESSDamage to the insulation was found in leads covered with polyurethane resin. The surface of the leads with damaged insulation responded positively to fluorecent staining. Under a scanning electron microscope, the surface of the internal wall appeared smooth, but cracks were seen on the surface of the external wall. The damaged leads were sliced perpendicular to their longitudinal axis and photoelasticity tests disclosed patterns on the surface wall, suggesting the presence of residual stress. This resin can be extruded or cast to form a pipe which is then made into a lead by inserting metal wires into the lumen. These leads were probably exposed to compressive stress on their internal wall surface and residual stress (tensile stress) on the external wall surface. Such stresses were what were probably detected by photoelasticity tests. We speculate that the tension of external forces (bending, pulling, surface ligating, etc.) after implantation, combined with the residual stress, exceeded the durable stress limitation of polyurethane resin, resulting in cracking. This phenomenon was not seen in silicon resin leads, suggesting that leads made of polyurethane resin are subject to problems not only in the manufacturing process but also in the nature of the material itself. These results indicate that attention should be paid to the external forces mentioned above when polyurethane resin leads are used, and also to the course of patients after implantation of pacemakers with such leads.View full abstractDownload PDF (5625K) -
H TAKANO, S KYO, Y TAENAKA, T NAKATANI, H NODA, R OMOTO, T FUJITA, T A ...1990 Volume 19 Issue 4 Pages 1432-1443
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
JOURNAL FREE ACCESSAn original ventricular assist system (VAS) developed at the National Cardiovascular Center (NCVC) and produced by Toyobo Company has been clinically evaluated to determine its reliability and effectiveness at 33 institutes in conformity with the Japanese Drugs, Cosmetics and Medical Instruments Act. The system consists of two sizes of pneumatic and diaphragm-type pumps (adult-size pump; 70ml, pediatric one; 20ml) made of segmented polyether polyurethane and a control-drive unit with an automatic bypass flow control. The VAS was used in 56 adults and six children with acute severe heart failure. Thirty three patients (53.2%) were weaned from the VAS, and 15 (24.2%) were long-term survivors. Thrombus formation was noticed in the groove around the valve in eight cases and in the pump also in eight. Pump-originated serious complications were not seen. Hematological and biochemical findings revealed that the VAS did not directly affect to the major organs. The control-drive unit, including the automatic bypass flow control system, functioned accurately with less manpower, securing reliable control over the circulation. Two major causes of death were unrecoverable heart failure and multiple organ failure which resulted from late application. It was determined that 56 cases (90.3%) were reliabe and effective and six (9.7%) were indefinite. In conclusion, the Toyobo-NCVC-type VAS has been found effective and reliable; less thrombogenic and with less manpower for its clinical use.View full abstractDownload PDF (6981K) -
K TSUCHIDA, A HASHIMOTO, T OKOSHI, R SEINO, M ENDO, H KOYANAGI1990 Volume 19 Issue 4 Pages 1444-1448
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
JOURNAL FREE ACCESSA knitted dacron graft impregnated with gelatin (Gelseal®) was implanted in 17 patients with aortic aneurysms. The graft did not need preclotting. One patient with type IIIb dissection, expired on the 15th postoperative day due to necrosis of all abdominal organs related to narrowing of the visceral branches of celiac trunk, bilateral renal arteries, superior and inferior mesenteric artery. Autopsy revealed that Gelseal® had ordinary cellular responses of a knitted dacron graft. One patient died of pneumonia and renal failure seven months after surgery. These two deaths were not due to graft-related problems. The remaining fifteen patients are alive and well 9 months to 29 months (mean 20 months) after operation. We conclude that the clinical course of implantation of Gelseal® is similar to that of replacement of the regular dacron graft and Gelseal® is safe for clinical use.View full abstractDownload PDF (6535K) -
[in Japanese], [in Japanese], [in Japanese]1990 Volume 19 Issue 4 Pages 1449-1453
Published: August 15, 1990
Released on J-STAGE: October 07, 2011
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