Non-Diagnostic Hardware/Software/Medical Devices
A universal peptide-binding scaffold that is used to bind a target. The target can be a peptide or peptides of interest (for example, peptides associated with a...
A universal peptide-binding scaffold that is used to bind a target. The target can be a peptide or peptides of interest (for example, peptides associated with a disease state) or can represent the entire proteome. The target can be either protein fragments prepared by enzymatic digestion of the entire proteome or N- or C-terminal short sequences exposed by chemical denaturation of the entire proteome (unfolded proteins). The universal peptide-binding scaffold can be tailored to specifically bind a target using the methods described herein.
Dr. Bashir has developed a walking biological machine. This "bio-bot" can move spontaneously, and may be useful for sensing, information processing, transport,...
Dr. Bashir has developed a walking biological machine. This "bio-bot" can move spontaneously, and may be useful for sensing, information processing, transport, protein expression and actuation applications.
These technologies provide biodegradable bone implants and artificial bone matrices for bony tissue repair. They encompass: (1) a method for creating...
These technologies provide biodegradable bone implants and artificial bone matrices for bony tissue repair. They encompass: (1) a method for creating organoapatite (artificial bone) matrices on surgical metal implants, as well as the matrix materials themselves, and (2) a biodegradable polymer matrix for use in bone tissue repair. Both types of material provide immediate tissue treatment or repair, while allowing and encouraging natural repair processes and cell growth to occur gradually. They degrade to biocompatible substances and/or naturally occurring metabolites.
These technologies encompass a biodegradable, synthetic polymer for use as a tissue repair matrix, as well as a novel preparatory method for depositing organoapatites onto surgical metal alloys used in implants. The organoapatite matrix materials are included, as well. Both of these types of matrices are designed to promote natural tissue repair processes, following implantation, and to degrade, in situ, to physiologically and biochemically compatible compounds.
Biodegradable Amphiphilic Polymer Matrix
This novel material is designed to have a lipophilic binding moiety covalently coupled to a hydrophilic tissue adhesion moiety via a divalent linker comprising either a natural metabolite or a polymer biodegradable into a metabolite. The preparation of these polymers, as well as their use in formulating implant matrices for tissue treatment and repair, is provided as well. Preferred polymers are prepared using a lipophilic alcohol or amine to initiate polymerization of one or more cyclic esters of hydroxyl acids. The resulting polyester is then covalently linked to a polyionic group, via one of several linker moieties. The composition of the matrices can vary from viscous liquid to molded solid, based on its chemical constituents and molecular weights. Specific, preferred matrices exhibit self-assembly, characteristic of liquid crystal compositions, and impart a unique matrix structure and function, with localized, ordered domains. Such domains possess temperature-dependent order, enabling liquid-solid transitions as a function of temperature (i.e., solidifying from a pre-implant liquid to a post-implant solid or liquid crystal). Polymers used in implant compositions degrade after implantation, providing a temporary template for cell growth and localized release of any contained bioactive additives. For tissue repair, the matrix is gradually replaced by endogenous tissue.
In addition to being biodegradable, this innovative technology provides a unique matrix structure with localized domains. This property, coupled with its unique molecular structure affords significant potential for making implants with highly improved functionality. In addition, the liquid crystal nature of these matrices enables temperature-dependent ordering, i.e., the ability to change from liquid to solid following a change in temperature from slightly above-normal to normal body temperatures. The implant matrix composition can be used alone or can also contain an effective amount of a bioactive adjuvant (or cells) for tissue treatment/repair. The natural surfactant action of these amphiphilic, biodegradable matrices serves a tissue wetting/adhesive function; this, along with the ordered molecular arrangement, enhances cell growth and tissue regeneration at the implant site.
Methodology for Deposition of Organoapatites onto Surgical Metal Alloys
Organoapatites can be created by a serial treatment process, wherein a porous metal implant (typically a metal alloy) is immersed in a solution of a charged poly(amine)(s), followed by immersion in a second solution of a second, charged poly(amine)(s), whose charge is opposite that of the first poly(amine) (i.e., poly(lysine) (+) followed by poly(glutamate) (-)). The second polyamine solution may be the poly(amine) alone or in combination with apatite-forming constituents. These steps allow an insoluble, polyionic organic complex to form on the alloy, which serves as a type of scaffold for the subsequent, stable precipitation of apatites onto the coated alloy. The apatite-synthesizing step involves a ratio- and rate-controlled addition of solutions of calcium hydroxide and phosphoric acid to the final poly(amine) solution containing the metal alloy. Organoapatite precipitation occurs onto the alloy within minutes to hours. Following precipitation, the coated alloy is removed, rinsed twice, and vacuum dried, prior to use.
Current methods aim to improve the rate of bone osseointegration in cementless systems, either by applying highly crystalline calcium phosphate to porous metal implants, or inserting bone allografts or reconstituted bone at the metal/bone interface. While inviting bone growth, the former method consists of a brittle, ceramic phase that is not fully resorbed and requires a high processing temperature that degrades the mechanical properties of the metal substrate. The latter methods, especially those using synthetic bone materials, are not sufficiently like natural bone in microstructure and/or composition, and bone growth rates are not effectively improved. This technology provides a method for growing fully (or at least partially) resorbable, synthetic bone on the surface of a porous metal implant that can be used to stimulate cellular activity and bone growth, with replacement (at least in part) by natural bone tissue.
Professor Timothy Bretl of the Aerospace Engineering and Navid Aghasadeghi of ECE both from the University of Illinois have developed a method for learning...
Professor Timothy Bretl of the Aerospace Engineering and Navid Aghasadeghi of ECE both from the University of Illinois have developed a method for learning controller parameters for lower-limb prostheses using only observed unimpaired trajectories and the physical characteristics of amputees.
This technique is an improvement over the usual trial and error method that is currently used in the fitting of lower-limb prosthetic devices.
Patient characteristics are applied in an algorithm to automatically learn controller parameters for level-walking at a desired cadence, stair/ramp ascent and other modes of locomotion.
Below the knee muscle weakness, defined by weak dorsiflexor (shin) or plantarflexor (calf) muscle groups, can result from a variety of physical impairments or...
Below the knee muscle weakness, defined by weak dorsiflexor (shin) or plantarflexor (calf) muscle groups, can result from a variety of physical impairments or congenital abnormalities. Stroke, spinal cord injuries, polio and multiple sclerosis are among some of the physical injuries and congenital defects responsible for the condition. The largest complication from below the knee muscle weakness is abnormal gait, which when compensated for can lead to further complications in other muscles and joints.
Ankle-foot-orthoses (AFOs) have been designed to assist afflicted individuals in walking and rehabilitation of the weakened muscle groups. Unfortunately, many commercially available AFOs are passive devices that cannot provide assistance during the propulsive phase of gait. Furthermore, these instruments are not capable of adapting to changes in walking conditions. Powered AFOs have been engineered to overcome these limitations but lack practicality in that they are commonly tethered to off-board power sources.
This technology provides a non-tethered, portable pneumatic powered AFO that controls and assists propulsion of the foot as well as ankle motion using plantarflexor and dorsiflexor torque at the ankle joint.
A custom-built pneumatic rotary actuator is located at the ankle joint. Torque generated by the actuator is used for both motion control of the foot and to provide supplemental torque for the individual during gait. Pressure regulators are used to manage the force produced by the rotary actuator and valves are used to direct the flow of fluid power to the actuator. Control and sensing of the actuator is accomplished through use of pressure and angle sensors and onboard electronics.
This device can be used to aid individuals afflicted with below the knee muscle weakness or impaired gait resulting from any number of physical injuries or congenital disabilities. Portability of the device permits the device to be used in a variety of locations. Applications include:
The portable pneumatic AFO is beneficial compared to passive AFOs in that it:
Benefits over other powered AFOs include: