Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1998-12-21
1999-10-12
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 35, 604902, A61M 100
Patent
active
059647337
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a suction device for medical purposes particularly suitable for usage in Minimal Invasive Surgery (MIS).
In surgery, extravasating blood, tissue liquids, tissue fragments, bone fragments and -dust as well as pus, but also rinsing liquid such as sodium chloride solution or Ringer solution have to be removed from the region under treatment. While in the past mull swabs were used, these days suction devices are engaged. In dentistry e.g., salvia, blood, and left-overs from drilling have to be succed off. In intensive surgery, anesthesia, and endoscopic examination, body liquids of a variety of viscosities and consistencies have to be succed off (e.g., mucus, blood, urine, stool, bile, gastric juice, etc., also contrast liquids).
In general, suction devices for medical purposes consist of a permanently installed or a mobile vacuum pump, which is connected to a low pressure collecting containe that in turn, via an over-flow prevention apparatus, is connected to a so-called secretion bottle which in turn is connected to the suction tip via a suction tube. Both small volume and large volume suction apparatus exist, where such devices are denoted large volume suction apparatus whose inner diameter is larger than 4.9 mm. These suction apparatus can be plastic, but they can also be made from metal, or from other material.
When, while sucking off, tissue completely covers the aperture of the suction tip of the suction apparatus, low pressure is established, which can touch on the order of the pump's low pressure of 0.1 bar. Thus, tissue is pressed into the sucking aperture by the air pressure so that traumatic damage can be inflicted onto the tissue. In addition, tissue can be vered off at the inner edge of the sucking aperture, which likewise can lead to injuries.
Suction devices for medical purposes are known already. The DE-PS 40 04 373 describes suction devices for medical purposes consisting of a suction aparatus made from metal or plastics, which is equipped with one or several side apertures with a low pressure valve. According to the patent, the side apertures are shaped as elongated holes or as continuous grooves and they are covered with thin slitted film or slittable film respectively which can either be mounted as a tube or which can be pasted as film strips. In this way it can be avoided, even at a low pumping pressure, close to 0.1 bar, that the suction tip sucks fast to the tissue. So-called traumatic tissue defects do not occur any more. Moreover, optimal adaptation of the sucking power to the individual circumstances can be achieved by varying the slit size. Thus, at the same time, vacuum control in the way of manual, temporary coverage of the side apertures at the suction tip, considered disturbing during surgery, is rendered superfluous. As opposed to suction apparatus which are equipped in a common way, with side apertures above the suction tip, suction devices according to DE 40 02 373 can be operated without disturbing noise.
Although suction devices known according to the state of the art, meanwhile, largely help to avoid to traumatic tissue injuries as well as disturbing operating noises, and, in particular, are successfully used in neuro surgery, their range of service is constructionally limited to such operations that take place at atmospheric pressure. However, it can be observed that the number of operations, frequently conducted at high pressure of 0.01 to 0.1 bar (above atmospheric pressure), such as e.g. in the field of minimal invasive surgery, is steadily increasing. Due to rapid progress of medical technology as well as of opto electronics Minimal Invasive Surgery gathers importance. Concerning MIS, the healing process can be accelerated and the duration of the usually cost intensive stationary treatment can be reduced considerably since both, the operation expenditure can be kept at low levels, and the actual surgical treatment can be reduced to a minimum. In particular, given the socio-political importance of cost-reducing measures in the health-care syste
REFERENCES:
patent: 5542929 (1996-08-01), Laabs et al.
Appel Hans-Gunter
Laabs Walter
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