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Welch Allyn has a long history of finding solutions that help solve patient care problems. The company was founded in 1915 when Dr. Francis A. Welch and William Noah Allyn built the world's first handheld direct-illuminating ophthalmoscope. The company has since expanded its offering of diagnostic and therapeutic devices to include blood pressure scopes, otoscopes, stethoscopes, thermometers, exam lamps, patient monitoring systems, and cardiac defibrillators. Welch Allyn is also a maker of diagnostic veterinary devices, and it provides supply chain consulting and product support and training services. Descendents of the founding Allyn family own the company and continue to be involved in its management.

Westfield has been making single-use sterilization packaging for more than three decades. Its products include sterilization bags and pouches, as well as wraps, tray liners, and tapes. Westfield Medical also has a line of hospital furniture products that are easily sterilized, such as chairs, cleaning stations, lamps, packing tables, showers, and ultrasonic tanks. Though products are distributed through wholesalers and medical retailers, the company is also able to manufacture products according to clients' specifications. The UK manufacturer is a subsidiary of Jourdan plc.

Wheaton makes and markets a variety of laboratory instruments, specialty glass apparatus, and liquid handling equipment. Its products include bottles, vials, closures, chromatography equipment, environmental and sampling equipment, and life science products. Wheaton distributes its wares through its own catalog as well as through more traditional global laboratory supply companies. Customers include pharmaceutical firms, research labs, and universities. The company is a subsidiary of Wheaton Industries, which is owned by private equity firm River Associates Investments.

William Demant Holding A/S, one of the world's oldest and largest hearing aid makers, the holding company operates through a number of independent business units that also develop, manufacture, and sell audiological diagnostic instruments and communication equipment, including hands-free headsets and alarm systems for schools. Hearing aids are by far its biggest business, however, and its Oticon and Bernafon subsidiaries are selected suppliers of the US Department of Veteran Affairs. The company sells through its own sales force and independent distributors worldwide. William Demant announced an agreement to acquire US-based rival Otix Global in 2010.

World Heart develops VADs (ventricular assist devices) that can be implanted within the chest cavity next to the natural heart. Through the transcutaneous energy and information transfer (TEIT) system, electric power is used to monitor and control the heart. The devices are used as a bridging device for patients awaiting a transplant and for long-term support. World Heart's main product is the Novacor LVAS. The company has facilities in the US, the Netherlands, and Canada. World Heart is developing next-generation VAD products.

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