CN201481927U - Piezoelectric Driven Portable Insulin Syringe Pump - Google Patents

Abstract

The utility model relates to a piezoelectrically-driven portable insulin injection pump, which consists of a pump shell, a battery cabin, a battery, a thread plug, a piezoelectric motor stator, a piezoelectric motor rotor, a tailstock, an injection bin, a medicament storage device, an injection piston, an infusion tube joint and a control circuit board. One side of the pump shell is provided with the battery cabin; the battery is arranged in the battery cabin; both ends of the battery cabin are provided with a copper sheet respectively, and a positive electrode and a negative electrode are led out by the copper sheets to supply power to a system; one end of the battery cabin is connected with the thread plug; the other side of the pump shell is provided with the injection bin, the medicament storage device is arranged in the injection bin, and the head part of the injection bin is connected with the infusion tube joint; a driving bin can be positioned behind the injection bin and can also be parallel to the injection bin, the piezoelectric motor stator and the piezoelectric motor rotor are arranged in the driving bin, and a piezoelectric motor is connected to the tailstock positioned behind the piezoelectric motor; and the inside of the pump shell is provided with the control circuit board, and a liquid crystal protective cover and a functional key are arranged on the pump shell positioned above the circuit board. The piezoelectrically-driven portable insulin injection pump has the characteristics of high waterproofness, no noise, optimized structure, simple and convenient operation, friendly appearance, low cost and the like.

Description

Piezoelectric Driven Portable Insulin Syringe Pump

(1) Technical field

The utility model relates to a portable insulin injection pump driven by a piezoelectric motor, in particular to a portable insulin injection device driven by a piezoelectric motor and capable of regularly and quantitatively injecting insulin into a human body, which can help diabetic patients maintain stable blood sugar concentration.

(2) Background technology

Diabetes is a metabolic disease group characterized by continuous increase in blood sugar concentration. Statistics show that there are currently nearly 200 million diabetic patients in the world, and my country has as many as 41 million diabetic patients, ranking first in the world, and diabetes has become the third largest in human beings. Or the fourth leading health killer. However, diabetes cannot be cured at this stage, and its greatest harm to health is the complications caused by the patient's blood being in a high blood sugar environment for a long time. Therefore, controlling blood sugar concentration, preventing and treating diabetic complications has become the key to treating diabetes.

At present, two methods are commonly used to control the blood sugar concentration of diabetic patients. One is multiple subcutaneous insulin injections, that is, subcutaneous injections of insulin once or several times a day; the other is intensive insulin therapy, that is, insulin is continuously infused into the human body 24 hours a day. The North American DCCT experiment proved that intensive insulin therapy can reduce the occurrence of retinopathy by about 76%; reduce the incidence of persistent microalbuminuria and more serious albuminuria by 39% and 54%; reduce the incidence of clinical nephropathy by 60% ; Can more effectively control blood sugar concentration, prevent and delay the occurrence of diabetic complications.

Insulin injection pump, also known as "continuous subcutaneous insulin sustained release system". It can continuously provide the basic amount of insulin to the blood of the patient, and provide a large dose of insulin before meals, so as to control the blood sugar concentration and simulate the effect of insulin secretion by the pancreas. The use of insulin injection pumps is the main means of intensive insulin therapy.

Portable insulin injection pumps are favored by diabetic patients because of their small size and easy portability. In addition to avoiding the pain caused by multiple injections, they can also greatly improve the quality of life of patients.

At present, most of the portable insulin injection pumps use open-loop control of blood sugar concentration, and no wireless signal receiving device is used to detect blood sugar concentration in real time, so the control of blood sugar concentration is not ideal; in terms of sealing and waterproofing, for example, the patent name is "insulin pump", publication number It is a utility model patent of CN101138659A, its cavity structure is not well sealed, there is no isolation between the injection chamber and the drive chamber, and there is no sealing ring at the place where the infusion tube joint and threaded plug contact with the external connection, so the waterproof effect is not good; In terms of drive selection, most of them use small electromagnetic stepping motors, such as the utility model patent named "Insulin Pump" with the publication number CN2396824. It is inevitable to design corresponding deceleration and transmission mechanisms, so the overall structure is huge and complicated. In addition, the pump will inevitably produce noise when it is working, and the wear between the drive nut and the screw will cause the accuracy to gradually decrease; in addition, most insulin pumps on the domestic market are imported products, and the price is very expensive, and ordinary patients cannot buy them at all. rise.

(3) Contents of utility model

The purpose of this utility model is to propose a portable insulin injection pump driven by piezoelectricity in view of the above deficiencies. The pump is driven by a new type of piezoelectric motor, and receives signals sent by the blood glucose meter through wireless communication.

The utility model is specifically realized by adopting the following technical solutions:

A piezoelectric-driven portable insulin injection pump, including five parts: a pump casing, an injection device, a drive device, a power supply device, and a control circuit board, wherein:

The pump casing is divided into upper and lower layers, and the two layers are tightly welded to form a hollow structure. The inner space of the upper layer is installed with the control circuit board, and the outer surface of the upper layer is equipped with a liquid crystal protection screen and function buttons; the lower layer is The inner space is provided with the injection device, the driving device, and the power supply device, and an observation window is opened on the side thereof.

The injection device includes an injection chamber, a medicine storage, an injection piston, and an infusion tube connector. The shape of the injection chamber is U-shaped, and it is bonded to the inner space of the lower layer of the pump casing. A medicine storage device is installed inside the injection chamber. Both the injection chamber and the medicine storage device are transparent. The observation window corresponding to the injection chamber is convenient for observing the progress of the injection. The tail of the injection chamber also has a circular hole, and the head opening is provided with an external thread to cooperate with the internal thread of the infusion tube connector.

The driving device consists of a piezoelectric linear motor, a tailstock and a push rod. The piezoelectric linear motor can adopt the piezoelectric linear motor described in the patent No. CN101227157A, which includes a motor stator and a motor mover, and the mover can directly output linear motion. The motor mover is connected with the tailstock, and a rotary encoder and a force sensor are arranged inside the tailstock. There are two arrangements of the drives:

Mode 1: The driving device is located behind the injection device, and the motor mover is directly connected to the injection piston, which can push the injection piston to complete drug injection.

Mode 2: The driving device is parallel to the injection device, the motor mover is connected to the tailstock, the tailstock is connected to the push rod, the push rod is connected to the injection piston, and the push rod pushes the injection piston to complete the drug injection.

The power supply unit includes a battery compartment, batteries, positive and negative poles, and screw plugs. A battery is placed in the battery compartment, and the negative and positive electrodes are respectively drawn out through the positive copper sheet and the negative electrode copper sheet. One end of the battery compartment is also provided with an internal thread, and the internal thread cooperates with the external thread of the threaded plug.

The control circuit board is provided with a central processing unit, an interface circuit for driving a motor, an alarm device, a wireless communication device, a communication interface with an upper computer, buttons and a liquid crystal display.

The relationship between each part is as follows: the battery in the battery compartment provides power to the control circuit board and the motor; the wireless receiving unit in the control circuit board can accept the blood sugar concentration signal, and after the central processing unit calculates, it outputs instructions to control the movement of the linear motor. The alarm device, liquid crystal display and function keys form a human-computer interaction interface through the liquid crystal protection screen and function keys on the pump casing; the displacement output by the motor mover in the driving device can drive the injection piston in the injection chamber to complete the drug injection; the driving device The rotary encoder in the motor can feed back the displacement information of the motor mover to the central processing unit to realize the closed-loop control of the motor displacement, and the force sensor can feed back the pressure value of the current medicine liquid in the medicine reservoir to realize the detection of medicine blockage .

In addition, sealing devices are provided at the threaded connection between the injection chamber and the infusion tube connector, the inner wall of the small hole at the tail of the injection chamber, between the drug storage device and the infusion tube connector, and between the battery chamber and the threaded plug.

The utility model has the following advantages: the pump adopts wireless communication to receive the signal sent by the blood glucose meter to form a closed-loop control of blood sugar; it is driven by a new type of piezoelectric motor to simplify the structure, avoid noise and reduce costs; it adopts a closed shell The way to greatly improve its waterproof performance. The utility model has the advantages of optimized structure, safe and convenient operation, friendly appearance and comprehensive functions.

(4) Description of drawings

Fig. 1 is a sectional view of the utility model adopting a driving mode 1.

Fig. 2 is a sectional view of the utility model adopting the driving mode 2.

FIG. 3 is a schematic diagram of driving mode 1.

FIG. 4 is a schematic diagram of driving mode 2.

Fig. 5 is a schematic diagram of the overall structure of the utility model.

Fig. 6 is a functional block diagram of the control circuit board of the present invention.

Fig. 7 is a side view of the utility model.

The labels and symbols in the figure are explained as follows:

1. Pump casing 2. Battery 3. Battery compartment 4. O-ring

5. Threaded plug 6. Positive pole 7. Negative pole 8. O-ring

9. O-ring seal 10. Infusion tube connector 11. Drug storage device 12. Injection chamber

13. Injection piston 14. O-ring seal 15. Motor mover 16. Motor stator

17. Tailstock 18. Drive compartment 19. Push rod 20. Control circuit board

21. LCD protective cover 22. Function keys

(5) Concrete implementation of prevention methods

The utility model will be described in further detail below in conjunction with accompanying drawing.

As shown in Figures 1 and 2, a battery compartment 3 is provided on one side of the pump housing 1, and a battery 2 is installed in the battery compartment 3. Copper sheets are respectively provided at both ends of the battery compartment 3 to lead out the positive and negative electrodes 6 and 7, which can supply power to the system. . One end of the battery compartment 3 is connected with a threaded plug 5, and threaded connection is adopted between them, and an O-ring 4 is provided at the bottom of the threaded connection for waterproof and dustproof.

The other side of the pump casing is provided with a transparent injection chamber 12, which contains a transparent drug storage device 11, and an observation window is also opened on the casing at this place, through which the drug injection situation can be observed.

The injection chamber 12 is shaped like a U-shaped container, and its head opening is provided with an external thread, which is connected with an infusion tube joint 10, and is sealed with an O-shaped sealing ring 8 between them. An O-ring 9 is used for sealing between the infusion tube connector 10 and the drug storage container 11 .

Behind the injection chamber 12, there is a driving chamber 18, and a piezoelectric motor stator 16 and a mover 15 are housed in the chamber. The piezoelectric motor can adopt the piezoelectric linear motor described in the patent CN101227157A. There are two ways to arrange the motor:

Method 1: As shown in Figure 1, the motor mover 15 is connected to the injection piston 13 in the drug storage device 11 through the circular hole opened at the bottom of the injection chamber, and the linear displacement output by the motor mover 15 pushes the injection piston 13 to complete the medicine injection. An O-ring 14 is arranged between the motor mover and the hole wall of the injection chamber. The motor is connected to the tailstock 17 behind it, and force and angular displacement sensors are arranged in the tailstock to detect the output force and displacement of the motor, and feed back the signal to the control circuit to realize accurate drug injection.

Mode 2: As shown in Figure 2, the difference of Mode 1 is that the driving chamber 18 is parallel to the injection chamber 12; the linear displacement output by the motor mover is transmitted to the push rod 19 through the tailstock 17, and the push rod 19 passes through the tail of the injection chamber The hole in the hole is connected with the injection piston 13 in the drug reservoir, and the injection piston 13 is pushed by the push rod 19 to complete the drug injection. The same tailstock 17 is provided with force and angular displacement sensors.

As shown in Figures 3 to 4, they are three-dimensional views of the layout of the two driving devices: Mode 1 is that the motor mover 15 is directly connected to the injection chamber, and Mode 2 is that the motor mover is connected to the tailstock, and then installed on the tailstock. The push rod 20 is connected into the injection chamber.

As shown in Fig. 5, it is a structural diagram of the utility model, a control circuit board 20 is arranged between the upper and lower layers of the pump casing 1, and a liquid crystal protection screen 21 and function buttons 22 are arranged on the upper surface.

As shown in Figure 6, it is the functional block diagram of the control circuit board of the present invention. The CPU is the core component of the whole system. It is responsible for processing various received information and controls each peripheral circuit; the display, the alarm device and the keyboard constitute the system. Machine interface; the communication interface is responsible for communicating with the upper computer to download online programs and online debugging; the wireless communication unit is responsible for receiving the current blood glucose concentration signal sent by the blood glucose meter and transmitting it to the CPU to realize closed-loop control of the blood glucose concentration; the CPU controls the motor The control of the motor is realized through a special interface circuit, which can transmit the control command of the CPU to the motor controller, and can also receive the motor displacement signal fed back by the sensor to realize the closed-loop control of the motor.

As shown in Figure 7, it is a side view of the utility model. In the figure, there is a groove on the threaded plug 5, which can be inserted into coins, etc., so that the patient can disassemble the battery; medicine device; the square window in the figure is the observation window.

Claims (6)

1. Piezoelectric drive portable insulin pump, the device consists of pump housing (1), battery compartment (3), battery (2), threaded plug (5), piezoelectric motor stator (16), mover (15), tail Seat (17), injection chamber (12), drug storage device (11), injection piston (13), infusion tube joint (10), control circuit board (20), is characterized in that: A battery compartment (3) is provided on one side of the pump housing (1), and a battery (2) is housed in the battery compartment (3), and copper sheets (6) and (7) are respectively arranged at both ends of the battery compartment (3) to connect the positive electrode and the Lead out the negative pole to supply power to the system; one end of the battery compartment (3) is connected to the threaded plug (5); An injection chamber (12) is provided on the other side of the pump housing, and a drug storage device (11) is installed inside, and the head of the injection chamber (12) is connected with an infusion tube connector (10); The driving chamber can be located behind the injection chamber or parallel to the injection chamber. The piezoelectric motor stator (16) and mover (15) are installed in the chamber, and the piezoelectric motor is connected to the tailstock (18) behind it; A control circuit board (20) is arranged inside the pump housing, and a liquid crystal protective cover (21) and function keys (22) are arranged on the pump housing above the circuit board. 2. The insulin pump according to claim 1, characterized in that: the piezoelectric motor is a linear motor driven by piezoelectricity, without intermediate transmission or reduction mechanism. 3. The insulin pump according to claim 1, characterized in that: the injection chamber (12) is shaped like a U-shaped container, one end is provided with threads and a flange, and the other end is provided with a circular hole, and is fixed on the on the pump housing. 4. The insulin pump according to claim 1, characterized in that: both the injection chamber (12) and the medicine storage (13) are transparent, and an observation window is opened on the casing. 5. The insulin pump according to claim 1, characterized in that: the front end of the threaded plug (5) is electroplated with a layer of conductive layer, which communicates with the negative electrode of the battery and the copper sheet (7). 6. The insulin pump according to claim 1, characterized in that: the threaded connection between the injection chamber (12) and the infusion tube joint (10) is sealed with an O-ring (8); O-ring seals (9) are used to seal the medicine containers (11); O-ring seals (4) are provided at the threaded connection between the battery compartment (3) and the threaded plug (5); the tail of the injection compartment (12) An O-ring (14) is provided in the wall of the circular hole.

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