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Publication Date: 2004-Nov-19
Document File: 4 page(s) / 41K

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A fluid-pressure type collision management system for patient safety comprises a fluid-pressure enclosure mounted to an apparatus component that is susceptible to patient collision. A fluid-pressure switch is coupled to the fluid-pressure enclosure wherein the fluid-pressure switch is activated for raising a collision response signal in response to pressure variation within the fluid-pressure enclosure due to patient contact.

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[0001]   The present invention relates generally to patient safety systems, and more particularly, to a fluid-pressure type collision management systems in an X-ray apparatus for use in diagnostic medical imaging.

[0002]    Generally, in an X-ray apparatus, an X-ray source and an imager are configured at opposite ends of a ‘C’ shaped member.  In a non-motorized apparatus, the user (e.g. operator) manually places the imager in position with respect to the area of interest in the body of a patient.  In this arrangement, the “C” shaped member is orchestrated physically by the user at manually controllable speeds, usually much within the reaction time of the user.

[0003]   In a motorized X-ray apparatus, in which the “C” orbital and rotational motion are motorized, anti-collision devices that would notify the contact (e.g. collision or impact) of the patient with the apparatus component are normally used in patient safety measure.

[0004]   However, the international regulations demand for installation of collision detection or anti-collision devices for medical equipment with speeds above 25mm/s.  For example, according to IEC 601-2-32 clause 22.4.1 regulations, in normal use, a power-driven equipment or equipment part is intended or likely to contact the patient, and when appropriate for the designed application, means shall be provided to detect patient contact and stop the motion if the contact could cause physical injury to the patient.

[0005]     Studies have shown that the majority of collisions take place with the apparatus components, such as for example, imager, tube head etc.  Collision with imager arises because the imager is usually brought as close as possible to the patient to get a clear image.  Further, the user would use all possible motions provided by the apparatus to get as close to the patient, and the best possible angulations.

[0006]     Since there is a safety regulatory requirement that the tube head be kept at a specific minimum distance from the patient, chances of collision with the patient are less.

[0007]       Although brushing of patient under diagnosis against apparatus components such as imager are usually common for obtaining a clear image, collisions that would be detrimental to the patient are required to be avoided and managed effectively.

[0008]    A known system for patient collision management includes using fluid bumpers are implemented in X-ray apparatus to absorb initial shock of patient contact and also reduce the force generated on patient by distributing the load on the body to bring down the local stresses, they have disadvantages of (i) an inherent inertia to respond to change in volume and (ii) a change in ambient conditions affecting the sensitivity of the device and shift the mean.

[0009]    Another known system for patient collision management includes using transducer-based systems in conjunctio...