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The development of the Precision Spinal Adjustor began when a chiropractor from Idaho sent his brother-in-law a hand-held adjustor and requested that he design a more reliable instrument. After examining the adjustor which, in reality was a dental instrument used to compact dental amalgam for fillings, it was concluded that the design was overly complex and prone to failure.

In addition, the instrument had the following drawbacks:

•  It was manually activated which led to fatigue and sometimes damage to the user's hand.

•  It was (despite a crude adjustment mechanism) a constant force device.

•  There was no way to control the energy transmitted to the patient; i.e., the energy of the "adjustment " varied depending on how the user held the instrument.

It was decided to redesign the instrument to eliminate its drawbacks. This resulted in the Kinetic Technology Precision Adjustor Model 115.

This instrument incorporated an embedded computer, pediatric as well as adult head and an advanced control and display panel. The Model 115 also provided:

•  precise control of the electro-mechanical impulse transmitting the same energy to the patient each thrust;

•  precisely controlled peak forces varying from 10 to 35 pounds; and

•  required no energy input from the user.

The Model 115 Precision Adjustor was introduced to the chiropractic profession in 1987 at the Las Vegas Conference of the ACA/ICA.

When an advertising program was initiated, a patient of Dr. Walter Vernon Pierce showed him an ad for the instrument. Dr. Evans was called to the Pierce Clinic to perform a demonstration. At the demonstration, The instrument was used on a patient. The patient shuffled into the room apparently in great pain. A temperature profile was obtained from the patient's spine and then the patient was positioned face down on an adjusting table. The adult head was set to the maximum force and Dr. Pierce asked, "Is this the most I can get out of this?" as he activated the instrument against his hand. Dr. Evans replied, "Yes." The instrument was used to adjust the patient in two places: once in the cervical spine and once in the sacrum. The patient was asked to get up from the table and be seated while another temperature profile of the patient's spine was taken. The patient was then asked to get up and walk across the room. The patient did so and turned around. "How do you feel?" the patient was asked. He raised his arms and cried, "Praise the Lord, there is no pain!" (The patient was a minister who was to refer his whole congregation to the clinic.) At that point, Dr. Pierce decided that he would like to help market the Precision Adjustor. 

In 1991, the Precision Adjustor was redesigned to simplify the manufacture and lower the price. The new instrument was called the Model 4. This model was further refined and renamed the Model 5 in 1992. The Model 5 included the option of single or multiple adjustments.

In 1992, it was observed by doctors using the Precision Adjuster that the sound generated by the multiple toggle adjustment changed coincidentally with the expression of relief by their patients. Dr. Pierce wondered if a shutoff mechanism might be based on this phenomenon. Five years before (in 1987), Dr. Evans had disclosed to his patent attorney an invention that incorporated a diagnostic mode, as well as a shutoff, based on joint stabilization. Dr. Pierce agreed to purchase the first instrument if Sense Technology undertook the development; thus, Computerized Fixation Imaging was born.

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