Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1994-09-14
1996-04-02
Gluck, Richard E.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
4174131, A61M 5142
Patent
active
055035388
DESCRIPTION:
BRIEF SUMMARY
The subject of the present invention is an infusion pump for medicinal liquids.
Intravenous infusion is an essential medication technique today in serious illnesses, cancer for example.
The efficacy of treatment is directly linked to the prescribed doses and limited by the level of toxicity of the active principles. The precision of the injection is therefore an important criterion in choosing the equipment to be used. In addition, it has been found that injection of an active principle, in order to respect the biological rhythms of the patient, must preferably be conducted at certain hours of the day, with the injection rate being variable throughout the injection period to take into account the immediate effects of the active principle on the organism.
It has also been found that it is possible, indeed advantageous, to combine a plurality of products, some of which can be injected simultaneously using the same catheter and others can be injected by different pathways.
There is a growing trend in modern medicine toward home treatment of the patient, and this is especially true for serious illnesses such as cancer and AIDS, which require a highly technological hospital setting and followup at the patient's home.
The infusion equipment now on the market does not take this trend toward home care into account. Existing portable pumps are generally heavy and cumbersome, and have limited autonomy. The pumps most often used are peristaltic pumps that squeeze a polymer or silicone tube to displace the product between a reservoir and the catheter supplying the patient.
This type of device suffers from the disadvantage of combining technical solutions with considerable size and weight:
Squeezing the tube requires a considerable force, produced by a system of rollers that is both cumbersome and heavy. The motor must be dimensioned to develop these squeezing forces, resulting in considerable weight. The power consumption of the motor is considerable, so that a number of disposable or rechargeable batteries that are both bulky and heavy is required, contradicting the idea of a portable pump.
Another solution consists in using devices of the syringe type in which the plunger of a syringe containing the product to be injected is driven stepwise by a motor. Apart from the disadvantages of weight and size described above, a system of this kind generally does not allow programming and can only be used for infusing a limited volume of liquid.
The goal of the invention is to provide an infusion pump for medicinal liquids with several channels, in other words one capable of allowing simultaneous infusion of several medicinal liquids with provision for mixing these liquids, or not, inside the pump, resulting in very limited size and reduced weight, while providing a very high degree of precision over a very wide throughput range, varying for example between 1 milliliter per day and 300 milliliters per hour, and offering considerable safety for the patient.
Another goal of the invention is to provide an infusion pump comprising a portion for transferring liquids, removably mounted on a housing for controlling and driving the pump.
To this end, the pump in question, of the type comprising at least one cylinder-and-piston device for drawing a liquid into-a receptacle, and delivering the liquid to a connection linked to the patient, is characterized by comprising the following: piston driven with an alternating motion, terminating at one face of the part, perpendicular to said face; terminates, having opposite each cylinder a cavity with a diameter larger than that of liquid; parts, and having a hole opposite each cylinder; disk facing the first part being stepped and comprising an external part that abuts, through the diaphragm on the face of the first part in which the corresponding cylinder terminates, precisely around this cylinder, and a central part projecting from the interior of the cylinder, said disk comprising regularly distributed through holes provided near its periphery; first part as the cylinder in question, said h
REFERENCES:
patent: 3676026 (1972-07-01), Tupper et al.
patent: 4545735 (1985-10-01), Ims
patent: 4573888 (1986-03-01), Kitchin
patent: 4646781 (1987-03-01), McIntyre et al.
patent: 5344292 (1994-09-01), Rabenau
Scattergood Mark G.
Wiernicki Michael V.
Gluck Richard E.
Laboratoire Aguettant
LandOfFree
Infusion pump for medicinal liquids does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Infusion pump for medicinal liquids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infusion pump for medicinal liquids will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2013155