![]() ![]() The drill guide remained fixed relative to the bone, secured by manual pressure. The sensors were oriented at a 5 ° angle relative to the drilling axis in the horizontal plane, and they measured displacement of the drill relative to a custom-fabricated drill guide with a flat, machined surface for reliable displacement measurement. We chose these two sensors to enable us to evaluate the influence of different levels of sensor repeatability and to evaluate a single versus dual-beam design. The sensors were a Keyence IL-300 (Keyence, Osaka, Japan) (range 160 mm to 450 mm repeatability, 30 μm sampling rate 0.33 ms to 5 ms) and a Panasonic HG-C1400 (Panasonic, Osaka, Japan) (range 200 mm to 600 mm repeatability, 300 μm to 800 μm sampling rate, 1.5 ms to 10 ms). (Fig.2) 2) and configured to send data to a microprocessor and personal computer. (Fig.1) 1) on either side of the drilling access in the horizontal plane (Fig. Our laser gauge prototype consisted of two commercially available laser displacement sensors mounted on a ConMed MPower2 (ConMed, Utica, NY, USA) surgical drill (Fig. Our specific research question is: (1) Can a prototype laser range-finder measure bore depth in bone as well as or better than a conventional depth gauge in terms of accuracy and precision (that is, variability)? In the current study, we present and evaluate a device based on laser range-finding technology. Our group has presented unpublished evidence that a mechanical linear transducer device could measure hole depth with better precision than the standard depth gauge, but we felt that this first-generation mechanical device would be relatively difficult to refine into a device that could be certified for use in the operating room as a retrofittable subsystem. However, these integrated designs require purchasing new drills, so the depth-measurement feature is not retrofittable to existing surgical drills.Īlthough these previously presented devices claim to improve the accuracy of depth measurement, few quantitative data have been shown to substantiate their claims. Some authors have recognized the desirability of automatic depth measurement and have developed sophisticated surgical drills with built-in features for measuring bore depth, often coupled with drilling-force measurement and anti-plunge features. ![]() These incorrectly sized screws can have important clinical consequences such as tendon rupture. Using a depth gauge often results in placing screws of an incorrect length the proportion of incorrect screw sizing in distal radius fixation is 9%. The current measurement method for drilled holes uses an instrument called a depth gauge, which consists of a hooked wire and sliding component marked with graduations. Shorter screws are available in 1-mm to 2-mm increments, and the increments increase as the screw size increases. ![]() Accurate measurements of the drilled bore depth are necessary to select the appropriate screw length for bone fixation in osteosynthesis surgery. The depth gauge cannot be used at the position where the depth gauge strikes against the tool body.Surgeons who perform orthopaedic, plastic, and oralmaxillofacial surgery routinely need to measure the depth of holes drilled in bone. Adjust the depth gauge to the desired depth and tighten the side grip. Loosen the side grip and insert the depth gauge into the hole in the side grip. The depth gauge is convenient for drilling holes of uniform depth. Turn the wrench clockwise as shown in the figure to loosen the drill chuck. Place the wrench 19, adjustable wrench or one of otherĪppropriate wrenches on the hexagonal nut at the front of the drill chuck. Pliers or the like (Note: Do not hold the retaining ring por- tion.)Ģ. Hold the sleeve of the drill chuck firmly with water pump If the keyless drill chuck cannot be loosened because of a drill bit being caught inside the jaws of the chuck, loosen the drill chuck as follows.ġ. To remove the bit, hold the ring and turn the sleeve counter- clockwise. Hold the ring firmly and turn the sleeve clockwise to tighten the chuck. Place the bit in the chuck as far as it will go. Hold the ring and turn the sleeve counterclockwise to open the chuck jaws. To remove the bit, turn the chuck key counterclockwise in just one hole, then loosen the chuck by hand.Īfter using the chuck key, be sure to return to the original position. Be sure to tighten all three chuck holes evenly. Place the chuck key in each of the three holes and tighten clockwise. To install the bit, place it in the chuck as far as it will go. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |