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Portland, OR, United States

Oregon Biomedical Engineering Institute | Date: 2014-09-02

Embodiments herein comprise a hemostatic composition comprising a plurality of liquid expandable articles capable of expanding upon contact with a liquid. A suitable composition comprises a plurality of liquid-expandable articles that may be mechanically uncoupled from one another and therefore may be capable of moving independently from one another. The plurality of liquid-expandable articles may comprise a compressed material capable of a high-degree of expansion upon liquid contact.

Rutten M.J.,Providence Health and Services | Rutten M.J.,Oregon Health And Science University | Janes M.A.,Providence Health and Services | Chang I.R.,Providence Health and Services | And 6 more authors.
Stem Cells International | Year: 2012

Adult bone marrow mononuclear cells (BM-MNCs) are a potential resource for making Schwann cells to repair damaged peripheral nerves. However, many methods of producing Schwann-like cells can be laborious with the cells lacking a functional phenotype. The objective of this study was to develop a simple and rapid method using autologous BM-MNCs to produce a phenotypic and functional Schwann-like cell. Adult porcine bone marrow was collected and enriched for BM-MNCs using a SEPAX device, then cells cultured in Neurobasal media, 4mM L-glutamine and 20% serum. After 6-8 days, the cultures expressed Schwann cell markers, S-100, O4, GFAP, were FluoroMyelin positive, but had low p75(NGF) expression. Addition of neuregulin (1-25nM) increased p75(NGF) levels at 24-48hrs. We found ATP dose-dependently increased intracellular calcium [Ca 2+] i, with nucleotide potency being UTP = ATP > ADP > AMP adenosine. Suramin blocked the ATP-induced [Ca 2+] i but α, β,-methylene-ATP had little effect suggesting an ATP purinergic P2Y2 G-protein-coupled receptor is present. Both the Schwann cell markers and ATP-induced [Ca 2+] i sensitivity decreased in cells passaged >20 times. Our studies indicate that autologous BM-MNCs can be induced to form a phenotypic and functional Schwann-like cell which could be used for peripheral nerve repair. © 2012 Michael J. Rutten et al. Source

Mueller G.R.,Oregon Medical Laser Center Providence Health and Services | Pineda T.J.,Oregon Biomedical Engineering Institute | Xie H.X.,Oregon Medical Laser Center Providence Health and Services | Teach J.S.,Oregon Medical Laser Center Providence Health and Services | And 3 more authors.
Journal of Trauma and Acute Care Surgery | Year: 2012

Background: Noncompressible hemorrhage is the leading cause of preventable death caused by hemorrhage on the battlefield. Currently, there are no hemostatic agents with the ability to control noncompressible hemorrhage. A wound stasis dressing based upon rapidly expanding cellulose minisponges (MS) was developed and tested in a lethal noncompressible model in swine, by fully transecting subclavian artery and vein. MS were compared with conventional hemostasis dressings, Combat Gauze (CG), in a randomized comparison. Methods: Sixteen 40-kg swine underwent transection of the subclavian artery and vein through a 4.5-cm aperture. After 30-second free bleeding, randomly selected MS or CG (n = 8 per group) were administered by an independent medical officer. The wound cavity was filled with either MS + no external pressure or one CG + one KERLIX gauze with 3 minutes of external pressure. One reapplication was allowed for CG. Mean arterial pressure was maintained at 60 mm Hg with 500-mL Hextend and lactated Ringer's solution intravenously administered up to a maximum of 10-L until study termination at 1 hour. Results: Mean pretreatment blood loss was similar for MS (719 mL) and CG (702 mL). Primary end points, namely, hemostasis at 4 minutes (MS, 75%; CG, 25%; p = 0.13), hemostasis at 60 minutes (MS, 100%; CG, 25%; p = 0.007), and survival at 60 minutes (MS, 100%; CG, 37.5%; p = 0.026), were improved with MS as were secondary end points, namely, total blood loss (MS, 118 mL; CG 1,242 mL; p = 0.021) and length of application time (MS, 25 seconds; CG, 420 seconds; p = 0.004). Conclusion: The use of MS is a novel approach for the rapid, simple treatment of severe noncompressible hemorrhage, which provided statistically significant improvement in hemostasis and survival 60 minutes after injury and a large reduction in blood loss, resuscitation fluid requirement, and medic treatment time compared with conventional hemorrhage control dressings in a swine model. © 2012 Lippincott Williams & Wilkins. Source

Guo J.X.,Oregon Biomedical Engineering Institute | Lucchesi L.,Oregon Biomedical Engineering Institute | Gregory K.W.,Oregon Biomedical Engineering Institute
Contraception | Year: 2015

Background Polidocanol foam (PF), used clinically as a venous sclerosant, has recently been studied as a safe and inexpensive means for permanent contraception. Delivering the sclerosant to the fallopian tubes as a foam rather than a liquid increases the surface areas and thus enhances the desired epithelial disrupting activity of the agent. However, the foam is inherently unstable and degrades with time. Therefore, increasing foam stability and thus duration of the agent exposure time could increase epithelial effect while allowing reduction in agent concentration and potential toxicity. Materials and Methods We studied methods to improve foam properties that might improve safety and efficacy of PF for intrauterine application. Several types of microporous filters adapted to a syringe-based foaming device were used to study the effect of pore structures on the formation of PF. The foam drainage time and bubble size were characterized. The addition of benzalkonium chloride (BZK) to polidocanol was also investigated for its effects on foam characteristics. Results A syringe-based foaming device adapted with an inline filter produced smaller bubble PF with a longer foam drainage time. PF generated with a circular pore filter lasts longer than with a noncircular pore filter. The addition of 0.01% of BZK also improved the stability of PF. Conclusion The stability of PF is affected by the pore characteristics of the filter used for foam generation and enhanced by the presence of a small amount of BZK. The improved foam, if shown to be efficacious in animal models of contraception, could lead to a safe, simple and inexpensive method alternative to surgical contraception. © 2015 Elsevier Inc. Source

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