The weekly OBV has also failed to make higher highs (line e), and is now testing its WMA. Volume picked up last week.

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Companies are in the process of testing a device that will replace lung volume reduction surgery for patients with emphysema and repair heart valves by going through the skin.

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"Testing didn't account for the increasing volume at which cancellations can come in, " he said.

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Volume did pick up sharply Wednesday and the OBV is now testing its WMA and the downtrend, line d.

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Volcano Therapeutics, a maker of IVUS machines, is testing a new version that uses sophisticated software to quickly determine plaque composition and volume.

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The weekly on-balance volume (OBV) formed a negative divergence at the highs (line h), and is testing its long-term uptrend (line i).

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The weekly on-balance volume (OBV) has been in a narrow range for the past four months, and is now testing key resistance (line c).

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As noted previously, the weekly on-balance volume (OBV) did form a negative divergence at the recent highs (see circle) and is now testing its weighted moving average.

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