Ultrasonic Doppler imager having a reduced hardware adaptive tissue rejection filter arrangement

1997 ◽  
Vol 101 (5) ◽  
pp. 2431
Author(s):  
Zoran B. Banjanin
Keyword(s):  
Doppler Imager ◽  
Rejection Filter ◽  
Filter Arrangement ◽  
Tissue Rejection

Monolithic J-band image-rejection filter

1983 ◽  
Vol 19 (21) ◽  
pp. 902
Author(s):  
S.J. Greenhalgh ◽  
J.B. Swift ◽  
J.R. Cockrill
Keyword(s):  
Image Rejection ◽  
Rejection Filter ◽  
Image Rejection Filter ◽  
Band Image

A Band Rejection Filter of High Current Radio Frequency Ion Source for Neutral Beam Injector

2021 ◽  
pp. 1-6
Author(s):  
Wei Liu ◽  
Qinglong Cui ◽  
Sheng Liu ◽  
Lizhen Liang ◽  
Yuanzhe Zhao ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Ion Source ◽  
Neutral Beam ◽  
High Current ◽  
Neutral Beam Injector ◽  
Rejection Filter

scholarly journals Decellularized dermis extracellular matrix alloderm mechanically strengthens biological engineered tunica adventitia-based blood vessels

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bijal Patel ◽  
Bryan T. Wonski ◽  
Dan M. Saliganan ◽  
Ali Rteil ◽  
Loay S. Kabbani ◽  
...  
Keyword(s):  
Blood Vessels ◽  
Structural Integrity ◽  
Tissue Mechanics ◽  
Foreign Body Response ◽  
Low Probability ◽  
Fiber Maturity ◽  
Tissue Rejection ◽  
Decellularized Dermis ◽  
Body Response ◽  
The Ideal

AbstractThe ideal engineered vascular graft would utilize human-derived materials to minimize foreign body response and tissue rejection. Current biological engineered blood vessels (BEBVs) inherently lack the structure required for implantation. We hypothesized that an ECM material would provide the structure needed. Skin dermis ECM is commonly used in reconstructive surgeries, is commercially available and FDA-approved. We evaluated the commercially-available decellularized skin dermis ECM Alloderm for efficacy in providing structure to BEBVs. Alloderm was incorporated into our lab’s unique protocol for generating BEBVs, using fibroblasts to establish the adventitia. To assess structure, tissue mechanics were analyzed. Standard BEBVs without Alloderm exhibited a tensile strength of 67.9 ± 9.78 kPa, whereas Alloderm integrated BEBVs showed a significant increase in strength to 1500 ± 334 kPa. In comparison, native vessel strength is 1430 ± 604 kPa. Burst pressure reached 51.3 ± 2.19 mmHg. Total collagen and fiber maturity were significantly increased due to the presence of the Alloderm material. Vessels cultured for 4 weeks maintained mechanical and structural integrity. Low probability of thrombogenicity was confirmed with a negative platelet adhesion test. Vessels were able to be endothelialized. These results demonstrate the success of Alloderm to provide structure to BEBVs in an effective way.

scholarly journals Peripheral Nerve Transplantation: The Effects of Predegenerated Grafts and Immunosuppression

1992 ◽  
Vol 3 (1) ◽  
pp. 39-49 ◽  
Author(s):  
Thomas E. Trumble
Keyword(s):  
Cyclosporin A ◽  
Donor Site ◽  
Flexion Contracture ◽  
Brown Norway ◽  
Control Group ◽  
Neurologic Recovery ◽  
Nerve Grafts ◽  
Nerve Transplantation ◽  
Joint Flexion ◽  
Tissue Rejection

Research involving nerve transplantation has shown that tissue rejection limits the neurologic recovery unless the host is immunosuppressed. This study investigates an alternative to permanent or temporary immunosuppression using a rat model with nerve transplants from Brown- Norway rat donors to bridge defects in the sciatic nerve of Lewis rat recipients as these two inbred strains differ at both major and minor histocompatibility loci.The specific aim of this study was to evaluate if predegenerated nerve grafts decreased the tissue rejection and improved the neurologic recovery of animals with allogenic nerve grafts to avoid the problems associated with either short- or long-term immunosuppression. The animals in the experimental groups received cyclosporin-A, predegencrated grafts, both, or neither. The predegenerated grafts were produced by division of the nerve three weeks prior to grafting to allow for Wallerian degeneration to occur. The outcome was assessed by measurements stressing functional recovery (sensory testing, gait analysis, joint flexion contracture), studies of muscle recovery (muscle weight and hydroxyproline concentration), and histologic studies (axonal counts and inflammatory reaction). The animals receiving the predegenerated grafts without cyclosporin did have an improved recovery (joint flexion contracture 35° ± 8 ° and hydroxyproline ratio 1.52 ± 0.16) as compared to the joint flexion contractures and hydroxyproline ratios of the allograft group of animals without either cyclosporin- A or pretreatment and the ungrafted control group (47° ± 18°, 1.68 ± 0.34, and 53° ±15° ,4.50 ± 0.27, respectively, p < 0.01). However, all the isograft groups and allograft groups with cyclosporin-A, regardless of whether the graft had been predegenerated or not, had greater neurologic recovery than the allograft group with predegenerated grafts but without cyclosporin-A by the same parameters (p < 0.01). Allograft groups with short-term immunosuppression with cyclosporin-A did as well as isograft groups, and isograft groups with predegenerated grafts did not do any better than isografts without pretreatment (p <0.01).Clinical Relevance:Predegenerated nerve allografts will allow for greater neurologic recovery than standard nerve allografts avoiding the complications of immunosuppression, but the level of recovery is less than that of recipients of nerve allografts with immunosuppression. Nerve transplants would avoid the problems of neurologic deficits at the donor site and allow multiple large deficits to be treated easily.

Quality metric for filter arrangement in a multispectral filter array

2013 ◽  
Author(s):  
Kazuma Shinoda ◽  
Taisuke Hamasaki ◽  
Madoka Hasegawa ◽  
Shigeo Kato ◽  
Antonio Ortega
Keyword(s):  
Quality Metric ◽  
Filter Array ◽  
Filter Arrangement ◽  
Multispectral Filter Array
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