Device for intravenous infusion of fluids

 

(57) Abstract:

Usage: in medical technology for long-dosed injection of medication into a patient with the doctor asked speeds in the treatment of various diseases, mainly for work in conditions of oxygen and air medical hyperbaric chambers. The inventive device includes an elastic Executive body fluid that is installed with the possibility of interaction with a pneumatic actuator that includes a cavity, high and low pressure, separated by the first and second movable elements of the closed hydraulic cavity located in the hydraulic cavity regulating device, pivotally connected with the rotary knob, and the gas pressure regulator. According to the invention a pneumatic actuator is provided with a roller pump, line pneumopathy, wall hydraulic cavity and placed in a cavity of low-pressure pneumoperitoneum. The first movable element is designed as a non-rigid membrane and placed side cavity high pressure, is connected with the inner cavity of pneumothoracies, the second movable element is designed as placed with STO with the possibility of transmission of force through the membrane with a rigid center to the hydraulic cavity. While the hard center of the membrane is connected to the device lever four link mechanism, the shaft of the roller pump is placed in the cavity of low pressure perpendicular to the plane of lever four-link mechanism and it fixed the two hubs of the two overrunning clutches, the wedges are oriented in the same direction, and two cages of the overrunning clutches mounted on bearings on the shaft and located on opposite sides of the pump shaft hinges on the outside of the hoops, which are connected by two rods with a hard centre. In addition, pneumomechanical made as installed in a sealed enclosure between two coaxial saddles locking member mounted on the boom, which is installed with the possibility of mechanical interaction with the General hard centre of two membranes, sealed in an airtight enclosure, and external to the sealed enclosure sides of each membrane shared hard center-loaded compression spring, covered with a fork fixed to the hard centre of the working diaphragm, and a stop valve with two identical tension springs located in the plane perpendicular to the neutral position of the locking member with the axis of the seat, and fixed This fastening of the tension springs. In addition, one of the seats pneumothoracies communicated through a pressure regulator placed in the cavity of low pressure, with the line pneumopathy, and the other with low cavity pressure regulating device is designed as a rotary disk in which you have an arched window in the wall of the hydraulic cavity is made arcuate slot with the possibility of the message as a whole or in part with the window of the rotary disk, however, the actuator is made in the form of a built in roller pump flexible tube backbone devices for transfusion system for injections. 2 C. p. F.-ly, 7 Il.

The invention relates to medical equipment, namely, devices for long-dosed injection of medication into a patient with the doctor asked speeds in the treatment of various diseases, mainly for work in conditions of oxygen and air medical hyperbaric chambers during the session oxygenotherapy with excessive pressure. The invention can be used in food, chemical and other industries for accurate dosing of liquids, primarily for use in flammable and explosive environment.

Known Executive body of the bellows or flexible containers. In such devices the dosed liquid is in direct contact with details and device nodes, which requires a certain sanitization of internal cavities of the Executive body before each new dosage. In addition, such devices affected by the change in ambient pressure.

A device containing as the Executive body of the elastic tube, dressed in a roller pump. Elastic tube is included with the device for transfusion disposable system for infusion (drip), for example PR 11-01 GOST 25047-87. Rotating the pump rollers move with a given velocity of the liquid in the dropper tube, through metered-dose infusion.

However, the drive to the famous roller pumps always used the electric motor, which is unacceptable in terms of the oxygen environment in the patient's treatment in conditions of oxygen and air pressure chambers during sessions of hyperbaric oxygenation on fire safety rules.

Closest to the present invention is a device for intravenous infusion fluids containing elastic Executive body to pour the liquid set the tion, separated by the movable elements of the closed hydraulic cavity located in the hydraulic cavity regulating device, pivotally connected with the rotary knob, and the gas pressure regulator.

However, this device requires a special Executive body in the form of a flexible pouch, each time requiring using specific sanitary processing, and uses besides pneumohydraulic electricity, which is unacceptable in terms of oxygen and other flammable environment.

The aim of the invention is a device for intravenous infusion fluid as the Executive body of the roller pump driven, able to work in a flammable environment at an ambient pressure without changing the set speed infusion (dosage), the expansion of the scope and reducing maintenance time by applying standard disposable system for injections.

The aim is achieved by a pneumatic actuator is provided with a roller pump, line pneumopathy, wall hydraulic cavity and placed in a cavity of low-pressure pneumoperitoneum.

The second movable element is designed as posted by cavity low pressure membrane with a rigid center loaded with a compression spring that is installed with the possibility of transmission of force through the membrane with a rigid center to the hydraulic cavity. The hard center of the membrane is connected to the device lever four link mechanism. The shaft of the roller pump is placed in the cavity of low pressure perpendicular to the plane of lever four-link mechanism and it fixed the two hubs of the two overrunning clutches, the wedges are oriented in the same direction, and two cages of the overrunning clutches mounted on bearings on the shaft and located on opposite sides of the pump shaft hinges on the outside of the hoops, which are connected by two rods with a hard center.

Pneumomechanical made as installed in a sealed enclosure between two coaxial saddles locking member mounted on the boom, which is installed with the possibility of mechanical interaction with the General hard centre of two membranes, sealed in an airtight enclosure, and external to the sealed enclosure with the rigid center of the working membrane, and a stop valve with two identical tension springs located in the plane perpendicular to the neutral position of the locking member with the axis of the saddle, and mounted in a sealed enclosure.

The axis of rotation of the boom shut-off organ is located between the locking body and the place of fastening of the tension springs. One of the seats pneumothoracies communicated through the pressure regulator with line pneumopathy, and the other with low cavity pressure.

The regulating device is made in the form of a rotary disk in which you have an arched window. In the partition hydraulic cavity is made arcuate slot with the possibility of the message as a whole or in part with the window of the rotary disk.

The actuator is made in the form of a built in roller pump flexible tube backbone devices for transfusion system for injections.

The spring force of compression of the working diaphragm is connected with the pressure after the regulator pressure and the working area of the membrane by the following dependency:

R 0.5 x p x f, where R is the spring force of compression of the working diaphragm;

p is the pressure after the pressure stabilizer;

f effective area of the working membrane.

In Fig. 1 shows a structural diagram of a device for intravenous infusion fluid; Fig. 2 section a-a in Fig. 1; Fig. 3 section b-B in Fig. 2; Fig. 4 section b-b In Fig. 2; Fig. 5 rotary disk of Fig. 6 the fragment partitions; Fig. 7 section G-G in Fig. 1.

Device for intravenous infusion fluid contains elastic Executive body in the form of an elastic tube backbone devices for transfusion standard system for infusion and a pneumatic actuator that includes a cavity 1 and 2 high and low pressure, separated by movable elements 3 and 4 closed hydraulic cavity (SE) 5.

The standard system for infusion has a node for injection associated with transfusions and connected to the patient, drip-filter device and needle for connecting the device to the vial and the recipient.

SE 5 is a regulating device (choke) 6, pivotally connected with the rotary knob 7. In the cavity 2 low pressure are also the stabilizer 8 gas pressure, the roller pump 9, line 10 provide non-rigid membrane 13 and situated on the side of the cavity 1 high pressure connected with the inner cavity of pneumothoracies 11.

The movable element 4 is made in the form situated on the side of the cavity 2 low pressure membrane 14 with a rigid center 15 loaded through the frame 16 by a spring 17 compression force which is directed toward the SE 5. Hard center 15 is connected to the device lever four-link mechanism comprising a frame 16 and the levers 18 and 19.

The shaft 20 (the axis Of) the roller pump 9 is placed in the cavity 2 low pressure perpendicular to the plane of lever four-link mechanism.

On the shaft 20 are two of the hub 21 of the two overrunning clutches, the wedges are oriented in the same direction, and two clips 22 overrunning clutches mounted on bearings on the shaft 20 and located on opposite sides of the shaft 20 by means of hinges 23 and 24 on the outer side of the casing 22. The hinges 23 and 24 are connected by two connecting rods 25 and 26 with a rigid center 15.

Pneumomechanical 11 made in the form prescribed in the hermetically sealed casing 27 between two coaxial seats 28 and 29 of the locking member 30 mounted on the bolt 31. Bolt 31 is installed in the Central hole 32 made in General hard center 33 of the two membranes 34 and 35, mounted in a hermetically sealed enclosure 27. In oversteering 31 at the point that allows rotation of the boom in the hole 32 of the center 33.

With external relative to the body 27 of each side of the membrane 34 and 35 total hard centre 33 provided respectively by the springs 38 and 39 compression, covered with a fork 40.

Plug 40 mounted on a rigid center 15 of the working diaphragm 14 through the frame 16.

The locking body 30 has two identical springs 41 stretching, located in the plane perpendicular to the neutral position of the locking member 30 to the axis O1the seats 28 and 29 (Fig. 1). The spring 41 is fixed in a sealed enclosure 27. The axis ABOUT2rotation of the shafts 31 of the locking member 30 is located between the locking body 30 and the axis O3fastening of the springs 41.

The saddle 29 pneumothoracies 11 is located at the side of the spring 17 compression of the working membrane, communicated through the stabilizer 8 pressure line 10 pneumopathy, and opposite the seat 28 with a cavity 2 low pressure.

Regulating device (choke) 6 made in the form of a rotary disk 42, which is made arcuate window 43. In the partition 12 GP 5 is made arcuate slit 44 (width of about 0.7 mm) with message as a whole or in part with the window 43 of the rotary disk 42.


R 0.5 x p x f, where R is the effort of the working spring;

p is the pressure after the pressure stabilizer;

f effective area of the working membrane.

As hydraulic fluid cavity used an aqueous solution of glycerin.

Device for intravenous infusion of fluids is as follows.

Input gas pressure in the stabilizer 8 pressure is converted into a control pressure through pneumomechanical 11 at the open gap between the seat 29 and the locking body 30 is supplied into the pneumatic cavity (PP) pneumatic-hydraulic actuator. Through the separation membrane 13 gas pressure is passed to the DPP, filled with water-glycerin mixture. In the control device 6, which represents the variable hydraulic throttle to decrease the control pressure to the value determined by the resistance mechanism of the roller pump 9 when making them work on the moving portion of the liquid in the tube drip (infusion), the resistance of the spring 17 compression of the working diaphragm and the efficiency of the whole mechanism. The pressure drop across the control device 6 causes the flow of water-glycerin mixture through the open valve, formed by the combination is of a certain volume of water-glycerin mixture is determined by the length of the open area at the moment and the differential pressure regulating device (choke) 6. The length of the open channel is established in accordance with the set speed infusion (infusion).

The working membrane 14 under the action of pressure in the SE through the hard center 15 moves the frame 16 to the right in the direct course of the mechanism. Frame 16 via a crank mechanism including a connecting rod 25, the hinge 23 and the yoke 22, jammed in the direction of rotation of the ball and the hub 21 overrunning clutch, overcoming the resistance of the spring 17 causes the shaft 20 of the roller pump 9 (axis) to rotate clockwise in Fig. 3.

In another overrunning clutch when the movement of the rigid center 15 the direction of rotation of the cage opposite (counterclockwise), the ball is released in the wedges of the coupling and ferrule 22 rotates idle.

The membrane 14 does a little move (on the order of 5 to 10 mm) that provides a small angle of rotation of the cage clutch (about 5-10 degrees from the middle position). Thus, the design eliminates a stop at the dead point of the crank mechanisms (dead point is reached when turning the clips at 90 degrees from the middle position).

At the end of the forward stroke is rigidly fixed on the frame 16, and hence on the hard center 15 plug 40, clutching arrows 31 throws a stop valve 30, blocking the seat 29 of the control pressure line and telling PP pneumatic-hydraulic actuator with a cavity 2 low pressure. The pressure of the PP frame 16 is reset and begins to reverse the movement (to the left) under the action of the spring 17. Thus the force of the spring 17 through the membrane 14 creates on the throttle 6 pressure drop, under the action of which there is a flow of water-glycerin mixture through the open at the moment, the area of the slit 44. The flow of the mixture occurs at a time determined by the length of this segment.

Frame 16 via a crank mechanism including a connecting rod 26 and a second overrunning clutch hinge 24, causes the shaft 20 of the roller pump (axis O) of the rotation (as in the case of forward travel, clockwise).

The rotation shaft 20 of the roller pump is transmitted to the hub, on which are fixed three rollers, alternately pinching elastic tube system for infusion by pressing the lodgement and moving the portion cut off rollers fluid in an elastic tube in the direction to the site of injection in a patient with a given speed.

The previously mentioned ratio of the effective area of a diaphragm 14, the spring 17 and the set switch 11 of the control pressure allows the C outdoor section of the slit orifice 6 water-glycerin mixture for forward and reverse motion. This time corresponds to a given performance roller pump 9, and hence the speed of dispensing of the medication or saline solution through the system for infusion, the tube of which is laid in the roller pump.

Indeed, if we consider the equilibrium condition on the hard center 15, get with the direct course (p1x f R + C;

where p1p R/f C/f; at flybacks (R C) p2X f

where p2R/f C/f, where C is the resistance mechanism of the roller pump, including a useful force on the clamping tube dropper and moving in the last of the liquid;

p1the difference on the throttle 6 in the direct course;

p2the difference on the throttle 6 in the reverse course.

Substituting in both of the above expressions for the differential value

R 0.5 x p x f, we obtain p1p20.5 x p (C/f, and when the same drops at the same speed the flow of fluid through the throttle shaft of the roller pump with constant speed.

The compliance ratio

R 0.5 x p x f allows a constant infusion rate (the same for forward and reverse motion of the working membrane) regardless of the pressure in the cavity of low pressure (ydachnoe pressure) regardless of the set value of speed infusion (drop on the inductor 6), and irrespective of the magnitude of resistance on the shaft 20 of the pump, i.e., the infusion rate at different position of the slider 6 are different, but the same for forward and reverse motion of the working membrane, and the infusion process is smooth (it is the same for the other resistance of the roller pump, for example at a different pressure in the tube system for infusion (drip).

At the end of the return stroke of the frame 16 plug 40 its other extreme position, compressing the spring 39 acts on the shared hard centre 33 membranes 34 and 35 pneumothoracies 11 and throws the locking body 30, no message PP with pressure in the cavity 2 and telling her line of control pressure. The working membrane 14 begins direct motion (right). The cycle repeats.

As can be seen from the algorithm of operation of the drive mechanism, the consumption of compressed gas is carried out only when the direct course of the membrane 14, while the rotation shaft 20 of the roller pump is carried out both in direct and reverse the course that provides continuous infusion at half the consumption of the driving gas.

Design pnevmoperegruzhatel 11 provides the application of a force of springs 38 and 39 of the compression point is Ruzhin 41 strain on the axis O3shifted by the amount of eccentricity relative to the axis O2in the direction opposite to the locking body 30. Thus, only two stable positions of the locking member 30 either he clung to the saddle 28 line low pressure or to the seat 29 of the line control pressure, i.e. the pressure after the regulator 8 pressure (Fig. 1).

An intermediate position of the locking body is unstable. Made this in order to minimize direct partecke from the line control pressure line low pressure switching valve and thereby reduce the gas consumption.

Springs 41 stretching creates a moment of force on the boom shut-off body (shoulder, depending on the angle of the boom from the Central axis) opposite to the moment of force of the spring 38 or 39 (depending on the direction of motion at this point, the fork 40). A stop valve 30 is detached from the saddle, when these moments are compared. Upon further movement of the locking member 30 from the saddle moment of force from the compression springs exceeds the increasing value of the moment of forces from the tension springs due to a sharp decrease of the shoulder against the force of the tension springs and a slight decrease of the spring force of compression. So opalescence and partecke drive gas is minimal.

The use of water-glycerin mixture as a liquid, filling the hydraulic cavity, justified by the fact that this liquid has a high viscosity and, therefore, can provide a small speed infusion (range is typically set speed infusion 1-99 drops/min). In addition, water-glycerin mixture allowed to be used in the environment of the oxygen pressure chambers. This fluid is also convenient because it is easy to search for the desired viscosity by changing the concentration of glycerol in water solution.

Thus, the proposed device has a pneumatic drive roller pump, which allows to use it in an oxygen environment, under variable ambient pressure, and to use standard disposable system for infusion (drip). It also reduces the time required to prepare the device for operation, extends the range of use of the device, for example for use in oxygen chambers.

1. DEVICE FOR INTRAVENOUS INFUSION FLUIDS containing elastic Executive body fluid that is installed with the possibility of interaction with a pneumatic actuator including a cavity and high nishagandhi in the hydraulic cavity regulating device, pivotally connected with the rotary knob, and the stabilizer in the gas pressure, wherein the pneumatic actuator is provided with a roller pump, line pneumopathy, wall hydraulic cavity and placed in a cavity of low-pressure pneumoperitoneum, the first movable element is designed as a non-rigid membrane and placed side cavity high pressure, is connected with the inner cavity of pneumothoracies, the second movable element is designed as posted by cavity low pressure membrane with a rigid center loaded with a compression spring that is installed with the possibility of transmission of force through the membrane with a rigid center to the hydraulic cavity, moreover, the hard center of the membrane is connected to the device lever four link mechanism, the shaft of the roller pump is placed in the cavity of low pressure perpendicular to the plane of lever four-link mechanism and fixed the two hubs of the two overrunning clutches, the wedges are oriented in the same direction, and two cages of the overrunning clutches mounted on bearings on the shaft and located on opposite sides of the pump shaft hinges on the outside of the cage, which sonarmatica body between two coaxial seat valve body, mounted on the boom, which is installed with the possibility of mechanical interaction with the General hard centre of two membranes, sealed in an airtight enclosure, and external to the sealed enclosure sides of each membrane shared hard center-loaded compression spring, covered with a fork fixed to the hard centre of the working diaphragm, and a stop valve with two identical tension springs located in the plane perpendicular to the neutral position of the locking member to the axis of the saddle, and mounted in a sealed case, with the axis of rotation of the boom shut-off organ is located between the locking body and the place of fastening of the tension springs, in addition, one of the seats pneumothoracies communicated through a pressure regulator placed in the cavity of low pressure, with the line pneumopathy, and the other with the low pressure cavity, in addition, the regulating device is made in the form of a rotary disk in which you have an arched window in the wall of the hydraulic cavity is made arcuate slot with the possibility of the message in whole or in part, with the window of the rotary disc, the actuator is made in the form prolagene the>2. The device under item 1, characterized in that the spring force of compression of the working diaphragm is connected with the pressure after the regulator pressure and the working area of the membrane by the following dependency:

R = 0,5 P f,

R - the force of the spring compression of the working diaphragm;

P is the pressure after the pressure stabilizer;

f is the effective area of the working membrane.

3. The device under item 1, characterized in that the liquid used is an aqueous solution of glycerol.

 

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