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Biomedical subjects

A Fuchsberger

Publications and source records attributed to A Fuchsberger.

9 recordsLinked to original sources
PubMed1989

[Machining of bone with rotary cutting burrs].

The cutting of bone is widely used in medicine. Many different procedures are done with cutting burrs, reaching from orthopaedic surgery, traumatherapy up to oral surgery and dentistry. Accordingly are the variety of rotary cutting burrs. This paper describes the investigations of important cutting burrs such as rose-head burrs, diamond cutters and conventional bone cutters (Lindemann system). Main intent of this research is to study the thermal response, cutting quality and working accuracy of these instruments while boring and cutting cortical bone with regard to various cutting and using parameters. The results of this experiment are instructions for a highly improved handling of those instruments.

Body Temperature↗
PubMed1988

[Damaging temperature during the machining of bone].

Yet one of the major problems with tools of bone machining is the possible thermal damage to the bone caused by the cutting action. Thermal damage to bone is the combined result of the temperature and the period of time that the bone tissue is at the elevated temperature. The effect of heat on bone tissue can result in the denaturation of the enzymic and membrane proteins and cellular death. That results in disorder capability of regeneration of bone tissue and in advantage of resorption. This paper described the research to study the thermal response of drilling of bone. Results are judging with temperature, cutting time as a normed comparison time and damaging temperature, which is the combined result of temperature and the period of time. Decrease of cutting time and temperature can avoid thermal damage, that be achieved with optimal drill bit geometry and conditions for drilling. A helix angle of 12 to 14 degrees, a point angle of 70 degrees and a clerance angle of 18 to 24 degrees are very appropriate for an optimized geometry. The borings should be executed by a medium cutting speed of 9 to 16 m/min (n = 600 to 1100 rpm at d = 4.5 mm). Concerning the thrust, one should not drill timidly but also avoid excessive forces. Thrust should be in the range of about 10 N/mmd. After 20 to 30 borings executed the drill bit must be repointed.

Bone and Bones↗
PubMed1987

[Effect of temperature on compact bone in saw cutting in relation to the conditions of use].

The use of reciprocating saw blades in surgery is accompanied by occurrence of high temperatures which may imply the risk of thermal damage to tissue. The severity of such damage was found to depend on temperature level and length of its action, and this, in turn, depends substantially on tool geometry, bone condition, cutting parameters, use of cooling, and attrition of saw blade. Cutting time can be minimised by increasing of revolutions and thrust force, which will lower the temperature acting on the bone. Temperature can be substantively lowered by use of a coolant, however, at the expense of worsening cutting time. The state of attrition of the saw blade used is of crucial importance to avoidance of thermal damage. A tool getting in contact with metal in the process of saw cutting should be discarded for good.

Animals↗
PubMedDate not supplied

[Optimization of the spiral drill for use in medicine].

Cutting tools are used in medicine a long time ago. Varying mechanical and thermal damage to bone tissue results from using cutting tools. These are often commented in the literature, but there is hardly any systematic studies of optimization of cutting tools. This present study was initiated in an attempt to improve the drill bit geometry and machining conditions. The study includes the thermal damage of bone and the soft-tissue injury, especially beyond the bone, by drilling of bone. The result of this study is a new drill bit geometry, which reduces the time of drilling. Thus lower temperature rises and less danger of thermal damage are achieved. It is easy to center and to start the cut with this new drill. The physical effort of the surgeon is substantially lessened. The danger of the soft-tissue injury can be disregarded. Optimized practice in medicine is gained by avoiding thermal and mechanical damage.

Animals↗
PubMedDate not supplied

[Optimizing instrument geometry of oscillating saws for use in medicine].

The sawing of bones is an often employed method in separating bones for osteotomies. In the application of reciprocating saw blades appear various risks for like thermal and mechanical damage of the bone delaying the healing process. In order to avoid such risks the geometry of sawing tools has to be optimized. Important demands are an easy handling of the reciprocating saw blades, shortening of the cutting time, reduction of temperature and an accurate to measurement and form guideway of the sawing tool. In this paper a newly optimized geometry of tool is established fulfilling the above-mentioned demands and avoiding bone damage by application of tools.

Animals↗