Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-05-25
1994-12-27
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604209, 604 82, A61M 500
Patent
active
053760794
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a dispensing device for dispensing at least two fluids. More precisely, the present invention relates to a manually operated dispensing device for dispensing two or more fluids which are contained within respective syringes which are received and supported by the dispensing device.
In the present context, the term "fluid" means a liquid or a substance which is pourable and in a liquefied state as distinct from a gaseous state.
Published international patent application, Publication No. WO 88/02259 discloses a technique of preparing tissue repair promoting substances, which substances are later on applied for tissue repair by means of two separate syringes which are to be operated simultaneously. The two separate syringes contain fibrinogen extracted from blood of a person or patient and a suitable enzyme, such as thrombin, respectively. The fibrinogen and thrombin form together, like in nature, fibrin which is an insoluble network of fiber-like material constituting a kind of tissue glue interconnecting a wound to be repaired. The healing glue also has favourable effect on the process of healing the wound. The tissue glue is advantageously used after surgery.
The technique of dispensing two components from a syringe assembly comprising two separate syringes which are to be operated simultaneously, however, is by no means advantageous as the two syringes are more difficult to operate than a single syringe and further as the initial frictional force of the two syringes far exceed the frictional force to be exceeded when using a single syringe for dosing a small amount of material from both syringes. Therefore, the technique of applying materials from two syringes which are operated simultaneously inevitably results in an inaccurate dosing of the materials and also in that excessive materials are dispensed from the syringes as an accurate and small amount dosing is simply impossible. The dispensing of excessive materials from the syringes is for numerous reasons inadequate and not advantageous as materials are wasted, which materials are often highly expensive.
As far as the technique of preparing tissue repair constituents or substances is concerned, reference is made to the above published international patent application.
Manually operated dispensing devices for dispensing materials from two or more syringes are also known within the art. Examples of such dispensing devices are disclosed in U.S. Pat. No. 4,690,306, published European patent application No. 0 363 967, published European patent application No. 0 408 494, published German patent application No. 32 34 250, published German patent application No. 36 02 975, and published German patent application No. 39 03 305. Reference is made to the above-mentioned patents and published patent applications, and the above-mentioned U.S. patent is further incorporated in the present specification by reference.
Common to the prior art dispensing devices for manually dispensing or dosing two or more fluids is the fact that the dispensing devices are not adapted to dispense small amounts of fluids in exactly dosed amounts. A further drawback relates to the initial frictional forces of the dispensing devices which result in that a fairly high initial frictional threshold has to be exceeded for dispensing the fluids which renders it difficult to dispense small amounts of fluids by means of the dispensing devices according to the prior art at small or fairly small operational power or pressure levels, such as pressure or power levels generated manually by e.g. a person of the staff of a hospital, such as a doctor or a nurse.
An object of the present invention is to provide a manually operated dispensing device for dispensing at least two fluids, by means of which dispensing device small amounts of fluids may be accurately dispensed or dosed in exact amounts and at small operational power levels.
A further object of the present invention is to provide a manually operated dispensing device for dispensing at
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Rosenbaum C. Fred
Wilkens Frank
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