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Blood compatible, shear sensitive gels
| Details |
Inventors: Vogler, Erwin A.; Shepard, Thomas A.; Graper, Jane C.;
Assignee: Becton, Dickinson and Company (Franklin Lakes, NJ)
Primary Examiner: Kim; John
Assistant Examiner:
Attorney, Agent or Firm: Thomas; Nanette S.
Gel formulations including a polydimethylsiloxane-polyethyleneoxide copolymer gelled with dibenzylidine sorbitol in the presence of water or alcohol. The gel formulations are useful for facilitating the separation of blood serum or plasma from the cellular portion of blood or as a thermoreversible shear sensitive substance. |
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DETAILED DESCRIPTION The present invention may be embodied in other specific forms and is not limited to any specific embodiments described in detail which are merely exemplary.
Various other modifications will be apparent to and readily made by those skilled in the art without departing from the scope and spirit of the invention.
The scope of the invention will be measured by the appended claims and their equivalents.
The gel formulations of the present invention preferably comprise a block copolymer; and a gelling agent.
The gel formulations of the present invention most preferably, further comprise a liquid vehicle.
Most preferably, the block copolymer of the present invention is polydimethylsiloxane-polyethylene oxide (PDMS/PEO).
PDMS/PEO is commercially available as SILWET.
RTM.
surfactant (trademark of Union Carbide, 39 Old Ridgebury Road, Danbury, Conn.
06817-0001).
SILWET surfactants are chemically unique and should not be confused with conventional polydimethylsiloxanes because they are composed of a siloxane backbone with organic polyalkyleneoxide pendants, forming chemical structures whose variations provide a wide range of useful performance characteristics.
SILWET surfactants are nonionic, concentrated, and function in aqueous and non-aqueous systems.
SILWET surfactants comprise the following features: low surface tension; high wetting; good dispersing, emulsifying, lubricity; sheen, gloss enhancing; static suppressing; contribute to antifoaming; moderate profoaming; broad range of solubility and aqueous cloud points; low volatility, good thermal stability; compatible with organic surfactants and system components, and low toxicity.
SILWET surfactants are polyalkylene oxide--modified polydimethylsiloxanes.
These block copolymers are of two distinct structural types.
The major class is a linear polydimethysiloxane to which polyethers have been grafted through a hydrosilation reaction.
This process results in an alkyl-pendant (AP type) copolymer, in which the polyalkylene oxide groups are attached along the siloxane backbone through a series of hydrolytically stable Si-C bonds
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