| 4491. |
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| 4492. |
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| 4493. |
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| 4494. |
- Höglund, Odd
(författare)
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Ligation of the mesovarium in dogs with a self-locking implant of a resorbable polyglycolic based co-polymer: a study of feasibility and comparison to suture ligation
- 2016
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Ingår i: BMC Research Notes. - : Springer Science and Business Media LLC. - 1756-0500. ; 9
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Tidskriftsartikel (refereegranskat)abstract
- Background Ligation of the mesovarium in female dogs may be cumbersome with risk of complications and is associated with intense noxious stimuli. A resorbable implant, a self-locking loop designed for surgery, was developed as an alternative to traditional ligation. The study aimed to test the feasibility of ligating the canine ovarian pedicle with the implant and to compare its performance to traditional suture ligation. Results In total 45 intact female dogs destined for elective ovariohysterectomy and adoption were included. In 21 dogs the new resorbable implant was used to ligate the mesovarium, and in 24 control dogs traditional suture was used with one encircling ligature. Mean weight of implant dogs was 10.7±5.6kg (range 3.5–22.0), and mean weight of control dogs was 12.8±6.4kg, (range 4.1–27.0). The body weight of dogs did not differ between groups (P=0.25). In total, 42 ovarian pedicles were successfully ligated with the implant. In one control dog, intraoperative haemorrhage from the left ovarian pedicle was diagnosed. The mesovarium was re-ligated and haemostasis was confirmed. All dogs recovered uneventfully. The ligation time of the mesovarium was significantly shortened (P=0.02) by using the self-locking implant versus a single ligature (3′28′′±1′05′′ and 5′29′′±3′54′′, respectively). Total duration of surgery differed between the groups (P=0.02) with a shortened duration of surgery when using the self-locking implant (15′56′′±2′47′′ and 20′39′′±8′58′′, study group versus control group, respectively). In both groups, duration of surgery and time required to ligate the ovarian pedicle were longer in larger dogs than smaller dogs. Conclusion The results of this feasibility study suggested the implant can be used to ligate the canine mesovarium. Compared with traditional suture ligation, the results suggested that time to ligate the ovarian pedicle and duration of surgery were significantly reduced with the implant. More time was required to perform surgeries in larger dogs.
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| 4495. |
- Höglund, Odd, et al.
(författare)
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Ligation of the spermatic cord in dogs with a self-locking device of a resorbable polyglycolic based co-polymer : feasibility and long-term follow-up study
- 2014
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Ingår i: BMC Research Notes. - : Springer Science and Business Media LLC. - 1756-0500. ; 7
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Tidskriftsartikel (refereegranskat)abstract
- Background: New surgical techniques are developed to enable a quicker, easier and safer surgery with reduced risk of complications and shortened time needed for recovery. A resorbable device, a self-locking loop, was designed for surgical ligation. The objective of this pilot study was to investigate the feasibility of ligating the spermatic cord with the device, its biocompatibility and long-term resorption in dogs. Results: The device was made of a block co-polymer (glycolide and trimethylene carbonate), manufactured by injection moulding and consisted of a flexible band running through a case with a locking mechanism. Ten devices were tested for ligation of the spermatic cords in five dogs admitted for routine neutering. The dogs were monitored by physical examination and ultrasonography of the site of ligation, area of spermatic cord and medial iliac lymph nodes regularly until no hyperechoic remnants of the device or acoustic shadowing or local tissue reactions were observed. Haemostasis of the spermatic cords was achieved with the devices. On ultrasonography the devices were seen as hyperechoic structures for 2 months after neutering causing acoustic shadowing for 1 month. The dogs were monitored for 3 - 5 months after surgery. Gradual decrease in echogenicity and final disappearance of the hyperechoic structures suggested resorption. Macroscopic and histological post mortem examinations were performed in one dog at 3 months after surgery. Post mortem examination showed a tissue reaction of a suture granuloma that was restricted in extent at site of the device. Conclusions: The results of this pilot study suggest biocompatibility and indicate that ligation of the spermatic cord is feasible with the device.
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| 4496. |
- Höglund, Odd
(författare)
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Resorbable Self-Locking Implant for Lung Lobectomy Through Video-Assisted Thoracoscopic Surgery: First Live Animal Application
- 2018
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Ingår i: Surgical Innovation. - : SAGE Publications. - 1553-3506 .- 1553-3514. ; 25, s. 158-164
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this pilot test was to test a new self-locking resorbable implant for hilum occlusion during a video-assisted thoracoscopic lung lobectomy in a surviving pig model. Once the thoracic cavity was assessed and structures identified, the right middle lobe and its respective hilum were exposed. The implant was introduced with a semiclosed loop through a working channel and positioned around the pulmonary lobe. Occlusion was performed with a conventional Crile forceps and a laparoscopic Kelly forceps. Lobe section was done with laparoscopic Metzenbaum scissors and tissue removal through the dorsal access. No signs of pneumothorax or bleeding were observed during a 60-day follow-up. Necropsy findings showed minimal pleuritis in caudal access and in the lobar stump. A granulomatous formation was found around a dense, amorphous material, which was identified as remains of a small part of the implant. Histopathological findings showed signs of a chronic healing process without other alterations. The resorbable implant LigaTie appears to exhibit similar handling and application characteristics during surgery as nonsurgical tie wraps. The resorbable implant avoids the uncontrolled substances not suitable for implants of conventional ties. The results of this pilot test suggested the resorbable implant's mechanical properties provided effective tissue support to complete the healing of the pulmonary hilum.
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| 4497. |
- Iandolo, Donata, et al.
(författare)
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Development and Characterization of Organic Electronic Scaffolds for Bone Tissue Engineering
- 2016
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Ingår i: Advanced Healthcare Materials. - : Wiley-Blackwell. - 2192-2640 .- 2192-2659. ; 5:12, s. 1505-1512
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Tidskriftsartikel (refereegranskat)abstract
- Bones have been shown to exhibit piezoelectric properties, generating electrical potential upon mechanical deformation and responding to electrical stimulation with the generation of mechanical stress. Thus, the effects of electrical stimulation on bone tissue engineering have been extensively studied. However, in bone regeneration applications, only few studies have focused on the use of electroactive 3D biodegradable scaffolds at the interphase with stem cells. Here a method is described to combine the bone regeneration capabilities of 3D-printed macroporous medical grade polycaprolactone (PCL) scaffolds with the electrical and electrochemical capabilities of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT). PCL scaffolds have been highly effective in vivo as bone regeneration grafts, and PEDOT is a leading material in the field of organic bioelectronics, due to its stability, conformability, and biocompatibility. A protocol is reported for scaffolds functionalization with PEDOT, using vapor-phase polymerization, resulting in a conformal conducting layer. Scaffolds' porosity and mechanical stability, important for in vivo bone regeneration applications, are retained. Human fetal mesenchymal stem cells proliferation is assessed on the functionalized scaffolds, showing the cytocompatibility of the polymeric coating. Altogether, these results show the feasibility of the proposed approach to obtain electroactive scaffolds for electrical stimulation of stem cells for regenerative medicine.
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| 4498. |
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| 4499. |
- Illergård, Josefin, et al.
(författare)
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Tailoring the effect of antibacterial polyelectrolyte multilayers by choice of cellulosic fiber substrate
- 2013
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Ingår i: Holzforschung. - : Walter de Gruyter. - 0018-3830 .- 1437-434X. ; 67:5, s. 573-578
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Tidskriftsartikel (refereegranskat)abstract
- There is a need for new, antibacterial cellulose-based materials. Antibacterial cellulosic fibers with irreversibly attached polyvinylamine (PVAm) and polyacrylic acid (PAA) in multilayers were developed based on a water-based physical adsorption process. The antibacterial substance is thus prevented from leaching, in contrast to materials containing, for example, silver. It was shown on fibers from different sources that the antibacterial effect against both Escherichia coli and Bacillus subtilis can be tailored. The efficiency correlated with the initial fiber charge, which in turn correlated with the amount of adsorbed PVAm. In the case of highly charged fibers, the antibacterial efficacy was more than 99.9%. A sustainable antibacterial material can be obtained in a simple way based on a water-based process.
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| 4500. |
- Iqbal, Muhammad Naeem, et al.
(författare)
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Surface Effect of Nano-Roughened Yttria-Doped Zirconia on Salivary Protein Adhesion
- 2021
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Ingår i: Materials. - : MDPI AG. - 1996-1944 .- 1996-1944. ; 14:21
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Tidskriftsartikel (refereegranskat)abstract
- Biocompatibility of yttria (3 mol%) stabilized zirconia ceramics, 3Y-TZP, was affected to a large degree as a result of protein adsorption from human saliva that in turn depends on materials surface properties. Variable nano-roughness levels in 3Y-TZP discs were characterized and tested for specificity and selectivity with respect to size and uptake for human salivary protein.
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