Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1991-12-18
1993-05-18
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604246, 222212, A61M 3700
Patent
active
052116328
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an infuser for continuously infusing predetermined volume of a solution of medicine into the human body within a predetermined period of time.
2. Description of the Related Art
There are two conventional methods of infusing a solution of medicine into the human body over a relatively long period of time: in one method, the solution of medicine is injected from an injecting needle or catheter, which is attached to a syringe containing the solution of medicine, by operating the syringe manually, electrically or by utilizing the action of a spring; and in the other method, an installation bottle containing the solution of medicine is used, and the solution is caused to drop therefrom under gravity or in an electrical manner.
In a case where the solution of medicine 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 medicine 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 remain in the same posture only for 1 or 2 minutes under such a condition. In contrast, in a case where the infusion of the solution of medicine 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 the solution of medicine is continuously infused into the human body by utilizing the instillation method, a comparatively large amount of a supplemental liquid relative to the medicine needs to be used, and even if the patient does not require such a supplemental liquid, he/she must be subjected 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 the solution of medicine is being carried out properly.
Japanese Patent Publication No. 45799/1980 discloses a flow control device for use in infusing a solution of medicine 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 solution. However, with this flow control device, it is not possible to continuously infuse the solution of medicine over a long period of time.
U.S. Pat. No. 4,318,400 discloses an infuser for continuously infusing a solution of medicine. In this infuser, a balloon containing therein the solution of medicine is inserted in a cylinder, and the balloon contracts in the axial direction with the solution of medicine contained therein being injected therefrom by virtue of the contracting action of the balloon. However, this infuser is disadvantageous in that the solution contained in the balloon cannot completely be discharged therefrom.
In view of the above drawbacks, the present applicant has previously developed "An Infuser with a Balloon for Continuously Infusing a Solution of Medicine" (Japanese Patent No. 1384289) for infusion into the human body over a comparatively long period of time and which has a simple structure is easy to handle and is reliably safe.
This patented infuser comprises a tubular main body having a flow path that extends formed along the longitudinal axis of the tubular main body, a portion with a check valve provided at one end of the tubular main body to allow the solution of medicine to be infused ther
REFERENCES:
patent: 3469578 (1969-09-01), Bierman
patent: 4318400 (1982-03-01), Peery et al.
patent: 4909790 (1990-03-01), Tsujikawa et al.
patent: 4998918 (1991-03-01), Mimura
Gutowski Anthony
Tsukada Medical Research Co., Ltd.
Yasko John D.
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