Surgery – Instruments – Sutureless closure
Patent
1997-09-12
1999-07-27
Buiz, Michael
Surgery
Instruments
Sutureless closure
606216, 606218, A61B 1708
Patent
active
059282657
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a device for stimulation of new tissue formation.
Tissue distraction, in which a pull tension is exercised upon the tissue area bordering the tissue defects, is employed for accelerating the closure and healing of large surface area and deep tissue defects. It has been demonstrated that such a distraction force exercised upon the tissue leads to a more vigorous tissue proliferation and therewith to a more rapid closure of the wound.
DESCRIPTION OF THE INVENTION
This distraction force can be applied essentially along the plane of the tissue defect by a skin distractor (see for example U.S. Pat. No. 5 263 971). This has been found particularly advantageous in conjunction with large surface area skin defects with little depth. In large surface area defects with greater depth it is advantageous to apply an additional distraction force perpendicularly to the plane of the defect (see for example DE-GM 93 20 582). This vertical distraction force can either be applied via a pull force applied perpendicularly to a skin distraction device or thereby, that the wound is sealed vacuum tight by means of a foil and that a vertical pull force be applied upon the tissue under the foil.
SUMMARY OF THE INVENTION
The invention is concerned with the task of further improving tissue proliferation during skin distraction.
The invention is based on the realization, that tissue proliferation is beneficially influenced when the distraction force exercised upon the tissue is not maintained constant, but rather is varied periodically. The relative change in the introduced distraction force lies in the range of a few percentage or less. The duration of the distraction force change period lies thereby in a range of a few seconds or less. Beginning with this realization the invention provides a device, in which a periodically changing tension force is superimposed or transcribed upon the distraction force. This tension force which varies periodically preferably engages on those means, which are employed to exercise the distraction force, that is, preferably on the skin distracter or skin pinching device which is anchored on the edges of the wound, or on the vacuum seal which covers the wound.
It may be preferable that the additional periodic tension force is introduced via a traction cable, so that this tension force has an effect at an angle to the plane of the tissue defect. Depending on the manner of accomplishing the distraction effect, the periodic tension force can therewith have an angle of action of from 0.degree. to 90.degree. to the distraction force.
In a constructively simple embodiment which is advantageously installable upon the sick bed, a traction cable engages at the distraction means provided at the wound. The traction cable is maintained under tension and a periodic transverse deflection acting upon the traction cable produces the periodically varying tension force.
In order that during positional displacements of the patient, on the one hand, the traction cable is maintained under tension and, on the other hand, no undesirable additional tension forces are produced, measures are provided, so that the traction cable can follow the movements of the distraction means provided on the wound.
For this purpose, in one embodiment the traction cable is directed over a deflection pulley and a weight is provided at the end of the traction cable opposite to the distraction means. The weight keeps the traction cable under tension and follows positional changes of the patient by moving up and down. The weight produces thereby on the traction cable a constant pretension, which can be employed as the distraction force or as a partial component of the distraction force. This pre-tensioning can also be predetermined by changing the weights.
In order that a periodic transverse displacement of the traction cable is effected by a suitable periodic change of the tension force, the end of the traction cable must be held sufficiently securely by the weight. In the case of larger weig
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Buiz Michael
Pham Tina T.D.
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