Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-06-19
1993-06-15
Mancene, Gene
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
6048901, 128DIG12, A61M 3700
Patent
active
052193349
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an infuser with a balloon for continuously infusing a drug in liquid form which is intended to be used in infusing into the human body a predetermined volume of a drug in liquid form that has already been infused into the balloon within a predetermined period of time.
BACKGROUND OF THE TECHNOLOGY
There are two conventional methods of infusing a drug in liquid form into the human body over a comparatively long period of time: in one method, a drug in liquid form is injected from an injecting needle or catheter which is attached to a syringe containing the drug in liquid form by operating the syringe manually, electrically or by utilizing the action of a spring; and in the other method, an instillation bottle containing a drug in liquid form is used, and the drug is caused to drip therefrom under gravity or in an electrical manner.
In a case where a drug in liquid form is infused into the human body over from a few minutes to a few hours, an injecting needle of a catheter must be kept attached to a syringe or instillation bottle serving as a drug supplier, and this causes great inconvenience to the operator as well as to the patient.
For instance, in a case where an infusion is continuously carried out in a manual fashion, the movement of both the patient and the operator is restricted for a certain period of time, and this gives them great pains mentally and physically. It is generally believed that people can take the same posture only for 1 or 2 minutes under such a condition. In contrast, in a case where the infusion of a drug is carried out electrically or by utilizing the action of a spring, a power source must be secured near the infusion site, and a syringe must properly be placed. This also restricts the action of the patient.
In addition, when a drug in liquid form is continuously infused into the human body by utilizing the instillation method, a comparatively large amount of a supplemental liquid relative to the drug needs to be used together, and even if the patient does not require such a supplemental liquid, he/she must be subject to the infusion of the same. Moreover, an instillation bottle or container must be placed at a position higher than where the patient is lying, and a complicated and long conduit is required to connect the injecting needle or catheter to the instillation bottle. This also restricts the movement of the patient, and the operator is required to confirm whether or not the instillation of a drug in liquid form is being carried out properly.
Japanese Patent Publication No. 45799/1980 discloses a flow control device for use in infusing a drug in liquid form into the human body. In this device, a core having a spiral groove formed therein is inserted in a sleeve, and this sleeve is clamped by means of a ring so as to control the flow of the liquid. However, with this flow control device, it is not possible to continuously infuse a drug in liquid form over a long period of time.
U.S. Pat. No. 4,318,400 discloses an infuser for continuously infusing a drug in liquid form. In this infuser, a balloon containing therein a drug in liquid form is inserted in a cylinder, and the balloon contracts in the axial direction with the drug in liquid form contained therein being injected therefrom by virtue of the contracting action of the balloon. However, this infuser is disadvantageous in that the liquid contained in the balloon cannot completely be discharged therefrom.
In view of the above drawbacks, the applicant of the present invention previously disclosed "An Infuser with a Balloon for Continuously Infusing a Drug in Liquid Form" (Japanese Patent No. 1384289) with a view to providing an infuser for continuously infusing a drug in liquid form that is intended to be used for continuously infusing a drug in liquid form into the human body over a comparatively long period of time and which is simple in construction, easy to handle and reliable in safety.
This patented infuser comprises a tubular main body having a flow path for a dru
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LaViola Frank A.
Mancene Gene
Tsukada Medical Research Co., Ltd.
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