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Vital Signs makes disposable medical products used to help patients breathe during surgery, in critical care settings, and to treat sleep disorders. Its anesthesia products include face masks and tubes, while its respiratory/critical care unit makes manual resuscitators, humidifiers, blood pressure cuffs, and other hospital products. Joint venture subsidiary Sleep Services of America diagnoses sleep disorders, such as obstructive sleep apnea (OSA), at more than 60 labs in seven states. In 2008 Vital Signs was acquired by GE Healthcare.

Volcano Corporation makes a variety of medical imaging devices used in the diagnosis and treatment of heart disease. Volcano's intravascular ultrasound (IVUS) systems give information about the condition of arteries as well as plaque and lesions. Its functional measurement (FM) products measure characteristics of blood around plaque in arteries. The company also sells related single-use disposable catheters and guidewires. Volcano sells its products to physicians, hospitals, and other health care providers worldwide through a direct sales force and distributors.

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.

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