Low-pulse continuous pump
Physicians need to see how blood flows through the arteries and heart to effectively treat coronary disease. To accomplish this, the cardiologist views images of the coronary anatomy on a monitor after injecting radiographic material (contrast) into the patient.
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Combining static and dynamic sealing, the pump achieves pulseless flow, 100% volumetric efficiency, and zero leakage.
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Syringe pumps limit the maximum volume of contrast that can be injected at one time, and require reloading if more fluid is needed. Conversely, waste results if only a portion of a filled syringe is injected. Peristaltic pumps, on the other hand, deliver fluid continuously, but pulsatile flow can effect image quality and tubing characteristics limit delivery pressures and flow rates.
A patented multiple-chamber positive displacement pump delivers fluid continuously to solve such problems. The pump is designed to be a sterile, plastic, disposable item suitable for many hours of operation. Designed for precision fluid dispensing and metering of liquids over a wide range of pressures and flow rates, the pump reduces costs by minimizing fluid waste and eliminating time-consuming re-loading procedures.
Amy Pomaybo, Medrad Inc. , One Medrad Dr., Indianola, PA 15051-0780; Tel: (412) 767-0780 ext. 4061; E-mail: apomaybo@medrad.com.
Easy out hip
hardware
According to some clinical studies, dynamic compression hip pins used to treat hip fractures have a 22% complication rate. These complications include cut out of the lag screw through weak bone that can lead to destruction of the hip joint, necessitating joint replacement surgery.
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Improved fixation enables the surgeon to apply additional tightening force, increasing the compressive force at the fracture site and drawing bone fragments more closely into apposition.
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The Talon hip compression screw system uses an actuator driver mechanism that allows the surgeon to reversibly deploy four prongs within the head of the femur, like opening and closing an umbrella, greatly enhancing the fixation and/or purchase of the construct, and making it easy to disassemble.
Testing indicates a two-fold increase in compression force without stripping the bone and a three-fold increase in torsional purchase within the bone over other commercially available hip-pinning systems.
John Sodeika, Orthopedic Designs, Inc. , Box 7778, St. Petersburg, FL 33734; Tel: (727) 343-0338; Fax: (727) 344-3244.
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