RU28025U1 - DEVICE FOR DOSED FLOW - Google Patents

Description

A 61 M 5/145

DEVICE FOR DOSED FLOW

The utility model relates to medicine, in particular, to devices intended for dosing the introduction into the patient's body of drugs in liquid form.

A device for the dosed introduction of liquid drugs, controlled manually (application EP 143503).

Known infusion device designed for implantation in the patient’s body, comprising a housing with a reservoir for storing medicinal fluid, a pumping and dosing unit for pumping fluid from the reservoir to the outlet of the catheter. The device comprises means for balancing the pressure between the interior of the housing and the environment. The tool is made in the form of a hydrophilic or hydrophobic membrane with pores of a certain size. The tool can also be made in the form of an infusion membrane in combination with an overpressure valve in the housing wall (application DE 3138320).

A device for supplying multiple doses of a liquid medicine, including a container for drugs in communication with the pump. An inlet opening communicating with the reservoir and an outlet opening with a catheter are made in the pump housing. Through the catheter, the drug is supplied in liquid form to the patient. Between the inlet and outlet openings of the pump there is a fluid channel and a chamber in which a certain volume of liquid medicine is placed. A valve is installed between the inlet and the chamber in the channel to allow fluid to enter the chamber, and a pressure-reducing valve is located between the chamber and the outlet

valve operating when the pump is turned on. Above the chamber is a flexible deformable wall of the pump (US Pat. No. 4,634,427).

Closest to the claimed device is an implantable infusion system with a pump, designed for continuous administration of drugs at a given speed, including a housing and a pump with a power source (application EP 110117). Between the parallel walls of the casing there is a pump with a pump chamber, inside of which there is a constantly magnetizable piston, which makes reciprocating movements. The pump, on the one hand, communicates with an expandable reservoir for drugs adjacent to one wall of the casing, and on the other hand with a catheter for introducing the drug into the patient's body. A two-way valve causes the drug to enter the pump chamber during a short intake stroke and to withdraw it from the chamber with a given infusion rate during a longer discharge stroke. The movement of the piston stroke during short intake strokes is carried out under the action of magnetic coils located inside the housing, and during longer exhaust strokes - by magnetic attraction between the piston and the pole tip of the electromagnet.

The closest analogue described has disadvantages that limit its use. Firstly, this device is quite complicated, since it requires a piston magnetization system and an appropriate power source. Secondly, the complexity of the device determines its lack of reliability. Thirdly, the control system of this device, if necessary, to change the volume of injected liquid will be quite complicated, since it is necessary to change the magnitude of the forward and reverse piston stroke, while influencing the time of these moves.

The problems solved by the proposed utility model is the creation of a simple, reliable, small-sized device for dosed fluid supply by means of a micropump (diaphragm pump) with adjustable capacity, and the device should provide easy controllability, that is, the ability to easily change the fluid flow rate over time.

The tasks are solved due to the fact that the device uses a small-sized stepper motor with low energy consumption and a reliable diaphragm micropump, for example, as in the patent US 4634427. The stepper motor is simple, reliable, miniature and has good controllability using current pulses. The use of a diaphragm pump allows the device to be used in cases where the use of peristaltic or, in particular, gear pumps is impossible due to their negative impact on the pumped liquid.

The volume of liquid injected by the diaphragm pump is constant in one stroke. Due to this, when the shaft of the stepper motor is rotated by a predetermined angle, it is possible to obtain a predetermined amount of fluid supply. The executive body acting on the flexible wall of the diaphragm pump is a bearing eccentrically mounted on the shaft of a stepper motor. Due to this, a technical result is achieved - the ability to inject liquid according to any given law.

As a technical result from the use of the proposed utility model, it can be noted that the presence of a small-sized stepper motor in the design of the device will allow you to connect a microcontroller to it and provide a metered injection of the drug at a predetermined frequency, including when using the device as an implantable body. The speed of pairing the stepper motor with the microcontroller provides the creation of a feedback system. In this case, the amount of medication administered is calculated according to a predetermined program, depending on the data received from the sensors placed in the human body (for example, from a blood sugar sensor). When implanting the device to the patient, the combination of a stepper motor and a microcontroller will allow o wofe-i contactless control of the dosage of the drug (without surgical intervention in the body).

The utility model is illustrated by drawings, in which:

figure 1 shows a functional diagram of a device for dosed fluid supply;

in FIG. 2 schematic diagram of the device.

A device for dosed fluid supply contains a stepper motor 1, a microcontroller 2, which controls the rotation of the shaft 3 of the stepper motor 1 according to a predetermined program (determines the number of revolutions or the angle of rotation of the stepper motor shaft per unit time, depending on the signals from the control panel or signals from the sensors).

The device also contains a rigid housing 4, on which a micropump is fixed - a silicone diaphragm pump 5, and the aforementioned stepper motor 1. A cylindrical body, for example, a rolling bearing 6. is eccentrically mounted on the shaft 3 of the stepper motor 1. There is a power source, for example, acc. battery 7, electrically connected to the microcontroller 2.

The outer race of the rolling bearing 6 is fixedly mounted relative to the flexible wall of the diaphragm pump 5 due to their bonding to each other or due to the friction force. As a result, the rotational movement of the shaft 3 of the stepper motor 1 is converted into a reciprocating motion of the bearing 6 in a vertical plane. The bearing 6 cyclically compresses the pump 5, thereby pumping the liquid.

The amount of injected fluid is determined by the eccentricity of the bearing 6, the speed of the stepper motor 1 and the volumetric capacity of the silicone diaphragm pump 5. By changing the speed of the stepper motor 1, you can adjust the fluid flow from 1 ml / day to 100 l / day.

Using a microcontroller to control the stepper motor 1 allows you to provide any characteristic injection of a certain amount of liquid in time.

The battery 7 for periodic recharging is connected to the charger 8. Charging the battery 7 can be carried out, including, and contactless induction method. The inductor method of charging the battery is based on the fact that if an electric current passes through the induction coil of the charger 8, then it arises; in this case, an alternating magnetic field causes the appearance of an EMF in a nearby induction connected to the battery 7. This phenomenon is often applied to contactless transmission of electrical energy, including when charging acc.

The microcontroller 2 and the power source (acc5 / mutator battery 7) are also electrically connected to the receiver 9, which provides contactless (as shown in the diagram) or contact reception of digital control signals supplied to the microcontroller 2 from the control panel 10. Depending on the supplied signals, the microcontroller 2 gives commands to start or stop the stepper motor 1, to change the operation parameters of the stepper motor 1 and, accordingly, the silicone diaphragm pump 5 (micropump). The operation parameters are set by the microcontroller 2 program.

This embodiment of the device allows for the possibility of rapid changes in a wide range of performance of the silicone diaphragm pump 5 (micropump), including remotely.

The microcontroller 2 and the battery 7 are also electrically connected to the transmitter 11, which provides contactless contactless transmission from the microcontroller 2 to the control panel 10 of digital signals (

the sums characterizing the parameters of the device (the set dependence of the injection volume over time, the completion of the program, etc.)

The control panel 10 is used to remote control the micropump and monitor its operation. The control panel includes a battery, a receiver, a transmitter, a keyboard for entering data to control the operation of the micropump, a display for displaying settings and malfunctions.

Sensors 12 of the patient's condition, for example, a blood sugar sensor, can be additionally connected to the microcontroller 2. The analog signal from such a sensor can be sent to microcontroller 2, which converts the analog signal from sensor 12 into a digital form and then analyzes it (for example, compares it with a predetermined threshold value of the measured parameter). Based on the information received from one or more sensors and the program embedded in the microcontroller 2, if necessary, the performance of the micropump is adjusted by increasing or decreasing the speed of the stepper motor 1.

Thanks to the use of a stepper motor controlled by a microcontroller and a diaphragm pump (pump), it became possible to change the time between drug deliveries, the volume of drug supply (from 1 ml per day to 10 l / min.) And the duration of its supply. The combination of a stepper motor, a microcontroller with devices for remote control (for example, via a radio channel) provides the patient with freedom of movement. The wide regulatory possibilities provided by the device design allow creating self-adjusting devices, i.e. injection parameters can be changed depending on signals from sensors, for example, a blood sugar sensor. All this, together with the small size, simplicity and reliability, allows you to create a device for constant wear to people who need a periodic supply of medication throughout the day.

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Claims (6)

1. A device for dosed fluid supply containing a pump for dosed fluid supply and an associated motor with a power source, characterized in that the pump is made in the form of a diaphragm pump containing a fluid chamber with a flexible wall, wherein a stepper motor is used as an engine and an element interacting with the flexible wall of the chamber of the diaphragm pump is eccentrically fixed on the shaft of the stepper motor, and the outer surface of the element is made in the form of a circular cylindrical surface and.  2. The device according to claim 1, characterized in that the diaphragm pump is made of silicone rubber.  3. The device according to p. 1 or 2, characterized in that the element interacting with the flexible wall of the chamber of the diaphragm pump is made in the form of a rolling bearing, the outer casing of which does not rotate relative to the flexible wall in contact with it.  4. The device according to claim 3, characterized in that the outer race of the rolling bearing is bonded to the flexible wall of the diaphragm pump chamber.  5. The device according to claim 1, characterized in that it is equipped with a microcontroller that controls the rotation of the shaft of the stepper motor. 6. The device according to p. 5, characterized in that the microcontroller is associated with one or more sensors of the patient's condition.