Abstract:
The present invention provides a method for using a polymeric cement to assemble medical devices. The method includes the steps of: (1) providing a first article of a low crystallinity polymer; (2) providing a second article of a low crystallinity polymer; (3) providing a cement composition having a first component of a cyclic olefin containing polymer or a bridged polycyclic hydrocarbon containing polymer and a second component of an effective amount of a solvent having a solubility parameter of less than about 20 (MPa)1/2; applying the cement composition to one of the first and second articles to define a bonding area; and (4) attaching the first article to the second article along the bonding area to fixedly attach the first article to the second article.
Abstract:
The present invention provides a medical device of a polymer composition. The composition has a first component obtained by copolymerizing a norbornene monomer and an ethylene monomer, the first component being in an amount from about 1-99% by weight of the composition; and a second component of an ethylene and &agr;-olefin copolymer, the &agr;-olefin having 6 carbons, the second component being in an amount from about 99% to about 1% by weight of the composition.
Abstract:
Plastic compositions, containers useful in the storage of red blood cells, and methods for providing such red blood cell storage containers and for storing red blood cells are disclosed. The plastic composition includes a polyolefin copolymer and a plasticizer. The flexibility of such plastic compositions and containers made thereof is substantially unchanged upon heating to a high temperature relative to its flexibility before such heating.
Abstract:
Multiple component polymer compositions for fabrication into articles. In particular, polymeric compositions comprising a heat resistant polymer; a radio frequency ("RF") susceptible polymer; a compatibilizing polymer; the composition having physical properties within the range a =70%; c 1.0; e =0.05; h
Abstract translation:用于制造成物品的多组分聚合物组合物。 特别地,包含耐热聚合物的聚合物组合物; 射频(“RF”)敏感聚合物; 相容聚合物; 所述组合物具有在<40,000psi范围内的物理性质; b> = 70%; c <30%; d> 1.0; e <0.1%; f <0.1%; g> = 0.05; h <= 60%; i = 0; 其中:a是根据ASTM D-882测量的组合物的机械模量; b是初始20%变形后组合物的长度恢复百分比; c根据ASTM D-1003,组合物的光学雾度为9密耳厚度; d是在熔体处理温度下测量的组合物在1Hz下的损耗角正切; e是组合物重量的元素卤素含量; f是组合物的低分子量水溶性级分; g是组合物在1至60MHz之间的介电损耗和25至250℃的高温; 在121℃下测量在27psi负载下组合物的1英寸条带的样品蠕变; 并且,i表示组合物在以约20英寸(50cm)/分钟的中等速度应变至约100%伸长率(原始长度的两倍)和应变增白(由1表示)或缺乏的应变之后不显示应变增白 (由0表示)。
Abstract:
The present invention provides a method for fabricating flexible medical tubings including the steps of providing a polymeric material, forming a tubing from the polymeric material, the tubing having a longitudinal axis and an initial diameter, and orienting the tubing along the longitudinal axis of the tubing to reduce the diameter of the tubing to define an oriented diameter.
Abstract:
The coating of a RF active material on a non-RF active substrate material of typical thickness for packaging purposes, can generate sufficient thermal energy to effect strong bonding of the substrate materials. The RF active material may be deposited on less than the entire inner surface area of the substrate material, preferably, at or near the portion of the substrate surface which represents the heat seal interface. In this manner of application, additional coating or printing of other substances on the substrate surface can be achieved without hampering the heat sealing process. Flexible medical containers capable of containing a product which is maintained and removed under sterile conditions, can be constructed on commercial production machines from these coated non-RF active substrate materials.
Abstract:
Improved Implant assemblies and methodologies provide immuno-protection for implanted allografts, xenografts, and isografts. The assemblies and methodologies establish an improved boundary between the host and the implanted cells. The boundary structure is laminated, combining elements having different characteristics beneficial to the survival of the implanted cells. Filaments of adhesive material lay in between the elements. The filaments of adhesive material have been melted in place by the application of heat and solidified in place by cooling to secure the elements together into a composite laminated structure.
Abstract:
The present invention provides an improved coextruded medical port tubing. The medical port tubing provides characteristics that are desirable in the medical industry and therefore can be used as a medical port tubing in, for example, renal therapy or blood donor tubes. To this end, the present invention provides a coextruded medical grade port tubing comprising: an outer layer comprising a blend of polypropylene copolymer and styrene-ethylene-butylene-styrene copolymer; a tie layer; and a core layer comprising polyvinyl chloride.
Abstract:
An apparatus for sealing and severing a web of film is provided. The apparatus includes a sealing bar having a body portion including first and second sidewalls and a top portion for melting and severing a portion of a web of film. A backup member is provided located on an opposite side of the film from the sealing bar for urging the film against a portion of the sealing bar. The apparatus also includes a holder for holding the sealing bar, the holder includes a first side and a second side that define a center region for receiving at least a portion of the body of the sealing bar, and first and second sides having shoulders. The shoulders and top portion of the sealing bar are so constructed and arranged that they deflect a bead generated at a molten area of the film when the film is sealed and severed and substantially limit the creation of a resultant bead in a final cooled product.
Abstract:
The loss modulus of a material is ascertained by subjecting a sample of the material to a mechanical vibration at the resonant frequency of the material. The dynamic driving force required to maintain the material in mechanical vibration at its resonant frequency is measured. Next, the static driving force required to displace the same material the same distance as when vibrating is measured. The quotient of the dynamic force divided by the static force is proportional to the tangent of the angle between elastic modulus and loss modulus of the material, or tan .delta.. Since the frequency of the material, when in vibration, is related to the elastic modulus of material, the loss modulus may be readily computed by multiplying the elastic modulus by tan .delta..An apparatus capable of performing this method includes a driving system that vibrates the sample material at its resonant frequency using a sinusoidal driving force which is 90.degree. out of phase with the material displacement and hence in phase with the sample's loss function.