Surgery – Means for introducing or removing material from body for... – Treating material applied to or removed from external...
Patent
1980-08-06
1983-05-10
Cohen, Lee S.
Surgery
Means for introducing or removing material from body for...
Treating material applied to or removed from external...
604114, 604305, A61M 3700
Patent
active
043824412
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for treating tissues, for example skin, comprising a porous material intended to abut against the tissue and a fluid-impervious shell or layer which covers at least some of the material.
The object of the present invention is to realize a device which makes possible a considerably more easily handleable and, for the patient, more comfortable device for treating ulcers and skin injuries or the like, which entails rapid healing under conditions which are safe with regard to the risk of infection. This object is achieved by means of a device which is characterised in that the porous material consists of at least one cell material with open pores, and that the shell or layer has at least one connection for fluid supply and at least one connection for fluid removal in spaced apart relationship, in order, by means of conduits coupled to the connections, to establish a treatment fluid flow from the supply connection, through the cell material in contact with the skin, to the removal connection.
The invention will be described in greater detail below with reference to accompanying drawings which schematically illustrate embodiments of the invention.
FIG. 1 is a top plan view of a simple embodiment of the invention and
FIG. 2 is a section taken along the line II--II in FIG. 1.
FIGS. 3, 4 and 5 show the device in operation and illustrate how the device works on treatment of a tissue.
The device according to the invention consists of a cell material dressing 11 with a communicating cavity system and a covering shell or layer 10 of fluid-impervious material. The shell 10 has at least one fluid supply connection 12 and at least one fluid removal connection 13. Thus, fluid can be supplied by the intermediary of the connection 12, as illustrated by means of arrows 18, and be caused to flow through the cell material dressing 11 and be removed via the connection 13, as shown by means of arrows 19. In order to facilitate fluid passage through the cell material, the fluid can be supplied under pressure and/or be removed by suction. In the supply conduit, there is coupled a regulator member 15 which accommodates a valve means and means for cooling and/or heating the fluid which is supplied to the cell material. A sensor 16 which is arranged to sense fluid saturation in the cell material, is placed therein and connected to the valve means of the regulator member 15 by a conduit 17. Fluid-impervious members 20 are disposed at the transitions of the connetions 12, 13 into the cell material in order to guide the flow.
The cell material dressing 11 constitutes a cavity system in the form of cells with open pores or communicating capillary systems, or consists of particles with interposed communicating gaps. The material can be synthetic, e.g. consist of polyurethane or similar plastics material, or may consist of regenerated cellulosic fibres with a binder of, for example, polyester polyamide on fabric. The material may consist of sponge or rubber or contain another type of elastic component. The structure can also be realized by overlaid particles of small size of plastics/glass/ceramics or the like. Organic compounds may be basic materials, for example cellulosic fibres of e.g. dextran polymer particles cross-linked with epichlorohydrin (Sephadex-Debrisan, possibly with glycerin or the like as binder). If particles are used as material, it may be practical to utilize continuous layers with open pores adjacent the skin or tissue layer which is to be treated.
The material can be inert with respect to chemical substances, biological particles and bacteria. The cell material may contain chemical compounds which reversibly bond, for example, water molecules and which thus actively contribute to the fluid suction capacity. The material can contain compounds which act as catalysts on the treatment effects.
The formed cavity system may be of random disposition or have a preferential major direction. This latter permits guiding the treatment fluid flow. Guiding can also be provided in the pore sy
REFERENCES:
patent: 603815 (1898-05-01), Duke
patent: 3026874 (1962-03-01), Stevens
patent: 3288140 (1966-11-01), McCarthy
patent: 3486504 (1969-12-01), Austin, Jr.
patent: 3610238 (1971-10-01), Rich, Jr.
patent: 3765414 (1973-10-01), Arlen
patent: 3874387 (1975-04-01), Barbieri
patent: 3896806 (1975-07-01), Wichterle
"Local Hyperalimentation of Open Wounds", Jouko Viljanto and Jyrki Raekallio, Br. J. Surg., vol. 63 (1976), 427-430.
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