WO1994014488A1

WO1994014488A1 - Dosing apparatus producing an aspiration-impellent action applicable to phlebology and other medical applications

Info

Publication number: WO1994014488A1
Application number: PCT/ES1993/000101
Authority: WO
Inventors: Miguel Angel Gramajo Booth
Original assignee: Miguel Angel Gramajo Booth
Priority date: 1992-12-24
Filing date: 1993-12-23
Publication date: 1994-07-07

Abstract

The disclosed equipment comprises a chamber (a) provided at one end with at least one plunger (2) connected to a control means (c) capable of producing within said chamber (a) a variable capacity, while at the opposite end the chamber (a) is terminated by a tubular nozzle (3) connected to a hypodermic needle (7), said needle (7) being connected to the tubular nozzle (3) through a disposable conduit (4) which is fitted to an anatomically conformed handle (e), the chamber (a) being connected to actuation means (b) controlled by remote control means (f).

Description

DOSING AND PRODUCING EQUIPMENT OF AN ASPIRING ACTION - IMPELLER, APPLICABLE TO PHLEBOLOGY AND OTHER MEDICAL USES

D E S C R I P C I Ó N

OBJECT OF THE INVENTION

The present invention is related to medical instruments in general, and more particularly it relates to equipment capable of generating an aspiration-impending action through a tube and a hypodermic needle, and of conveniently dosing said action, being fundamentally applicable in the field of phlebology, but also in other medical uses where similar benefits are required.

The apparatus that comprises it has been specifically designed to suck and inject liquids, - and its immediate application is essentially related to the field of sclerosing therapy of varicose veins; although, equally, it can be used in all precision work that requires the location and / or injection of blood or lymphatic vessels.

Such practices are frequent in angiology, vascular surgery, radiology and anesthesiology, mainly, since it is required to accurately locate difficult access vessels and body cavities, either due to their tiny size or because of their anatomical location.

And although, to simplify, throughout this description particular mention is made of the application of the invention to phlebology and its surroundings, it is clear that everything that is said regarding this application will be valid for use in other disciplines or techniques of aspiration, injection or location of vessels and body cavities.

BACKGROUND OF THE INVENTION

The need for the exact location of vessels is usually based on several reasons:

a) for its use in order to suck them, or to inject them with medicinal substances, radiological contrast material, etc.

b) to avoid them, when the technique developed requires it for security or other reasons.

With similar criteria, it is also very useful to inject and suction, the location of body cavities, such as the meningeal, pleural, ocular, articular, pericardial space, etc.

With regard to the state of the art on this issue, hypodermic syringes are used, particularly used in sclerosing therapy, which constitutes 70% of the specialist's effective working time.

In this type of work with hypodermic syringes, the operator must hold it firmly and insert it into a glass or vein, performing the classic technique of taking the body of the syringe with one hand while with the other pulls the plunger until observing the access of blood. This fact indicates that the needle is located inside the vein, although nothing ensures that when releasing one of the hands, the least movement produces, as usual, that the needle out of the vein, leading to the substance infiltrate the tissues, with the consequences imaginable.

It is good to remember that the hypodermic syringe (created by Rynd in 1985), was not ¹ designed to perform the aforementioned operations, so it has several disadvantages:

a) the precise location of a vessel, to ensure the injection into the light of the vessel, requires the operator to simultaneously use both hands "through five steps" (see OBBS, J. "The Treatment of Venous disorders", p. 468). So when you lack the necessary experience and skill, this manipulation often causes the needle to exit the lumen of the vessel and, consequently, the extravasation of the liquid, with severe effects (pain, inflammation, necrosis, etc.). .);

b) if the syringe is taken by operators with a low firm pulse or with limited experience, it is difficult or impossible to channel vessels, particularly smaller ones, due to the normal length of the syringe. the needle itself, defining between them a lever in which the smallest involuntary oscillation or tremor is markedly increased at the tip of said needle.

c) the use of solutions of high density, forces to exert such pressure on the head of the plunger of the syringe that it is necessary that it is of small volume, this implies the impossibility of injecting a certain Amount without refilling the syringe.

d) the ejection pressure, which must be of adequate range to that of the work to be performed, is limited only to the personal factor of the operator, -

e) in certain work modalities it is possible, and sometimes frequent, to over-inject (or overdose), because there is only one control of the dosage, and this is exclusively carried out by the operator; It follows that this control may be affected by personal issues of the operator himself, such as distraction, fatigue, etc.

f) in sclerosing therapy, the drawbacks of the above points also produce an increase in pain and inflammation in the patient;

g) the "airblock" technique is difficult and sometimes impossible to practice, since it is necessary to perform the syringe in an upright position, that is, with the needle up.

There are also other instruments and devices intended for injection, but their design does not respond to the purposes pursued here, being, in general, instruments that, being of very limited capacity, are only suitable for small doses. graduated medications, such as vaccines, insulin, mesotherapy, or for injecting predetermined volumes for prolonged periods, for example in cytostatic therapy. These devices therefore lack the agility and immediacy properties required in phylogeology, for example, to easily locate and inject vessels, with little or no pain, avoiding unwanted penetration of air into the system and dripping or residual ejection (due to the elastic components of the disposable elements).

DESCRIPTION OF THE INVENTION

The invention referred to in the present specification, provides an ingenious and simple solution to the problems posed, providing an ingenious and simple solution to the problems raised, providing an apparatus specifically designed for the work of venous sclero therapy, this It is, for the introduction of sclerosing substances in varicose veins.

This electromechanical device, through a tube or conduction exerts an aspirating and impending action of instantaneous action.

The distal end of said tube or conduit is provided with a hypodermic needle, supported by an anatomically designed handle.

The device is operated remotely from a pedal or a drive means provided by said anatomical handle, by electrical impulse from the device or by remote control.

The substance to be impelled is contained in hypodermic syringes of any size or in any container, bottle, vial, test tube, etc. The mechanism of the suction-impellent action is carried out through the actuation, already of a peristatic pump with bidirectional rotation movement, and of the bidirectional movement of the piston corresponding to a syringe.

In the latter case, said piston can be moved by mechanical action of an auger connected to a rotation motor and integral with the piston, or by direct pressure of the piston through a mechanism that has positive or negative pneumatic or hydraulic pressure.

One of the characteristics of the operation is that as soon as it is injected, even if the tube or conduction remains with residual pressure, when the cuttings are automatically interrupted, 1 leakage of the liquid, without giving rise to dripping, that is, that the tube can, if desired , to be perfectly purged (without air) before and after its impending action, and without residual pressure in the system since it would cause an unwanted ejection effect or incompatible with certain uses ("ready for action" function).

To achieve this purpose, aeration means is provided in the peristaltic pump system for the relief of pressure in the tube or conduit, while for the use of a hypodermic syringe the presence of a means of instantaneous release of the pressure on the plunger.

This device has a control panel that includes function indicator displays, being able to regulate the force or pressure of the aspirant-impeller action, program the quantity of liquid to be ejected or aspirate, with automatic cutting, and register the quantity of ejected liquid, the one that is still in the container, and even the one that was programmed to inject or aspirate. The device can also have an automatic and variable sound signal (beep), according to the program, to warn when the passage of a certain amount of liquid occurs.

For such purposes there are several advantages provided by the invention, such as:

a) facilitate the work of the operator, making it possible even for those people who have limited experience or have little manual dexterity (for example, trembling pulse), -

b) avoid injecting 'out of the glass'

c) increase the efficiency of the work, by making certain variables independent, such as flow power, respect for the personal factor, thus increasing the possibility that the sclerotherapeutic effect is carried out, -

d) reduce the effective working time by half, -

e) release a hand to allow it to perform other functions, such as varicose fingerprint recognition;

f) eliminate or reduce the high treatment factor;

g) reduce the inflammatory phenomenon and, therefore, shorten the recovery period;

h) prevent the possibility of overdose, since You can schedule 1 dose to be injected (per glass or per work session), -

i) allow quantifying and, therefore, controlling at all times, the quantity of medication being supplied;

j) automatically allow, and in any position, the use of the "airblock" technique, often used in sclerotherapy, -

k) ensure the perfect asepsis of the system, by means of the downloadable character of the groove, the needle and the syringe itself, enabling its replacement for each patient with the consequent guarantees that this implies.

For all of which it is to imagine the acceptance that said invention must have 1 be put into practice, whatever the category and destination that is given to it, since due to the characteristics that define it, it lends itself equally to suck and inject liquids in the field of sclerosing therapy of varicose veins, and any other work required precision _^ location and / or injection of blood or lymph vessels, in angiology, vascular surgery, radiology and anesthesiology; in the precise location of difficult access vessels and body cavities, be it due to their tiny size or because of their anatomical location, etc.

DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the features of the invention, this is accompanied Descriptive report, as an integral part of it, of a set of drawings in which the following has been represented by way of illustration and not limitation:

Figure 1.- It shows a schematic view of the device, allowing to appreciate its general constitution and arrangement of the different parts that comprise it, observing the presence of the syringe, the means of actuation of the same, the pedal remote control, the tube or conduit and, at its tip, the anatomical handle, in arrangement as shown, or also, in an inverted position to that shown, depending on the operator's work method.

Figure 1-A. - Shows, according to a representation similar to that of Figure 1, a variant embodiment in which the syringe is external to the housing of the drive group.

Figure 2.- Shows a schematic view of a possible control panel.

Figure 3. - Shows a diagram of the syringe drive system through a pneumatic circuit.

Figure 3-A. - Shows a schematic view of the control pedal, and its alternative actuation possibilities to produce aspiration and infusion, respectively.

Figure 4.- Shows an infusion flow diagram of the pneumatic system.

Figure 5. - Shows a diagram corresponding to the pneumatic suction system. Figure 6 - It shows another embodiment of the device shown schematically, in which the drive means is electromechanical.

Figure 6-A. - Shows a schematic view of the control pedal of the device, with reference to Figure 6.

Figure 7.- Shows a flow chart corresponding to the infusion system by electromechanical drive.

Figure 8.- Shows an operative diagram of the device applied to the technique aimed at locating the vein.

Figure 9.- Shows another operative diagram of the device, intended to produce continuous aspiration.

Figure 10.- Shows a schematic view of the control panel.

Figure 11.- Shows a block diagram of the electronic control circuit associated with the syringe.

Figure 12.- Finally shows a variant of the circuit of the previous figure.

In the different figures, the same reference numbers indicate the same or corresponding parts, the set of several elements having been indicated with letters, and specifically being the following:

(a) syringe. (b) bidirectional cylinder.

(c) half motor of the device.

(d) receptacle.

(e) anatomical needle holder (7).

(f) device remote control.

(AT) operating time interval considered.

(B) pneumatic pump.

(DI) display indicating the amount of solution (in cm ³ ) in the syringe.

(D2) display indicating the amount of solution preselected by (P3) to be injected.

(M) DC motor, or endless stepper motor

(NI) infusion position on the pedal (f).

(N2) suction position on the pedal (f).

(Pl) potentiometer.

(P2) push button or selector key the size of the syringe to use.

(P3) button or potentiometer preselector of the volume of liquid to be injected. (P4) suction selector valve (to locate a vein), or continuous aspiration.

(R) coupling between syringe piston (2) and cylinder piston (9) (b).

(S) endless.

(VI) first three-way electro-pneumatic valve.

(V2) second three-way electro-pneumatic valve.

(V3) third two-way electro-pneumatic valve.

(1) syringe cylinder.

(2) plunger (driven) of the syringe.

(3) tube or conduit connection nozzle (4) with (1).

(4) flexible tube.

(4 ¹ ) connection of (4) with (e).

(5) handle of (e)

(5 ') bend of (5).

(6) needle clamp chuck.

(7) hypodermic needle

(8) cylinder walls (b). (9 driving plunger.

(10 half engine body.

(11 connection means between (c) and (f)

(12 pedal.

(13 display.

(14 piston travel start sensor (2)

(15 piston travel end sensor (2)

(16 clamp.

(17 nut.

(17) slot.

(18 endless.

(18) bushings.

(19 guide.

(20 external control.

(21 central processing unit,

(22 EPROM memory.

(23 RAM. (24 display.

(25 real time clock

(26 keyboard.

(27 syringe sensor.

(28 adapter circuit.

(29 electrical conductors

(30 multiple connector.

(31 microprocessor.

(32 motor controller.

(33) start and end travel sensors.

PREFERRED EMBODIMENT OF THE INVENTION

In general terms (d) it is a receptacle that contains the mechanical and electronic means of the device consisting of: a container such as a vial-ampoule, ampoule, test tube, etc., intended to contain the substance to be injected (eg medicated ).

According to the preferred embodiment of Figure 1,. said container consists of the cylinder (1) of a hypodermic syringe (a) forming a chamber of variable capacity which, defined by the relative position within it of a plunger (2) commandable through a rod, by the part opposite ends in a tubular nozzle (3). This nozzle (3) constitutes the coupling point of one of the ends of a flexible and disposable tube or connection (4) whose other end, through the cylinder head (4 ') of an anatomical control handle (e), by a mandrel or the like (6) ends up assembling a needle (7), figure 1.

The handle (e) consists of a handle body (5) that has an intermediate bending (5 ¹ ) and ends at the mandrel end (6). So that by virtue of this intermediate bending (5 ') the handle (e) defines two unaligned sections (5) and (6), which give it an elongated "S" configuration, and thus constitutes an anatomical, adaptable conformation to the concavity of the hand, and that can be taken from (5 ') in the position indicated in figure 1, or in an inverted way, (with the section (6) down) according to the type of work to be done and the modality of the operator.

In addition, said handle (e) can be formed by two halves connected or hinged to each other, through which the conduit passes, inserted in a nozzle (4 ') of cylinder head and connected at its end to the needle (7) that It is fixed by means of a mandrel or similar. The syringe (a) or, where appropriate, the container used, is attached to the body of 1 casing (d) by appropriate means such as clamps, hooks, positional locks, cotters and others that, preferably, enable its removable assembly , by connecting it to an electronic control circuit, which is illustrated in Figure 11, so that it can thus send to this electronic circuit a signal indicative of the size and volume of the syringe (a).

It is also provided that instead of the syringe the device works with a peristaltic pump (not shown). On the other hand, the same device consists of a driving means formed by a bi-directional cylinder (b), of walls (8) in which a conductive piston (9) is channeled which, through a rod is connected to the plunger ( 2), driven, of the cylindrical (1) corresponding to the syringe (a), and said plunger (9) is, in turn, commanded by a motor means (c) whose body (10) by means of an endless screw (s) ) or other appropriate means commands said driving piston (9), the motor means being connected by (11) to the body (12) of a pedal (f) intended to remotely command the device.

It is very clear that the command can also be located in the handle itself (e), by one or more pushbuttons operable by the operator's own hand that controls the needle (7) from said handle (e).

Thus, the screw is connected to an impeller, preferably constituted by the electric motor (c) step by step (in other figures identified as M) that move said screw in a controlled manner and, through it, to the piston (2 ) that travels in the longitudinal direction of the syringe (a), figure 1.

The stepper motor (M) has a plurality of connections (14) through which an electronic control circuit is connected, as illustrated in the diagram in Figure 11. For the purpose of which the operator must not take their hands for other tasks than those of properly inserting the needle (7) in the vessel and provide ^'the drug is provided with an external control (20) constituted preferably by a pedal (f) which, through the electronic control circuit performs the tasks of blood aspiration (to determine if the end of the needle is correctly positioned within the vein) as well as the subsequent injection of the medication (figures 11 and 12).

In the embodiment of the invention, illustrated in Figure 2, the piston (9) of the cylinder (b), Figure 3, is driven by a pneumatic circuit comprising the pneumatic pump (B), which commands the electro-pneumatic valves (VI) and (V2) three-way, as well as a two-way valve (V3), so that, in response to the command of the pedal (f), or of the handle switch (e), if applicable, they are enabled according to the position of said pedal or said switch: in position (NI) which corresponds to the infusion drive, and (N2) corresponding to the suction drive (figures 3-A and 6-A), having the pedal (f) an intermediate joint from which it is pressed towards one or another function.

The flow chart of Figure 4 schematizes the infusion process through the pneumatic circuit.

Accordingly, when the pedal is pressed to position (NI), the pump (B) is commanded and, by means of this, the solenoid valve (V2) that presses the driving piston (9) corresponding to the bidirectional cylinder (b) is enabled which, by coupling (R) that links it to the rod of the driven piston (2) in the syringe (a), causes the movement of said piston (2) by expelling the liquid contained by the spout (3) and the conduction ( 4) until reaching the needle (7).

Then, through the same pedal (f) the solenoid valve (V2) is deactivated while the (VI) is activated for a certain interval (AT), to subsequently deactivate the pump (B) and said valve (VI). The plunger (9) returns without dragging (2) to conclude the infusion. Correlatively, the solenoid valve (V3) is activated for an interval (AT), after which it is deactivated and the system is aerated.

In turn, the diagram in Figure 5 corresponds to the pneumatic aspiration process.

Accordingly, the pedal (f) presses the position (N2) that activates the pump (B) and with it the solenoid valve (VI), which means that the piston (9) moves backwards dragging the plunger (2) ) of the syringe (a), and then giving rise to aspiration.

Then, when the pressure of the pedal (f) in (N2) ceases, the pump (B) and 1 solenoid valve (VI) mentioned above are deactivated, which concludes the aspiration while, correlatively, the solenoid valve (V3) is activated ) for a given interval (AT), resulting in aeration of the system that remains at atmospheric pressure.

This way of acting in the solenoid valves, both in the injection and in the aspiration, is what produces the automatic cutting of the passage of the fluid, preventing the dripping in the first case, and the prolongation of the suction, in the second.

Figure 6 shows an electromechanical command system, also operable from a pedal (f), figure 6-A and whose infusion process is the one represented in the flow chart of figure 7.

In this one it is observed how when pressing the pedal (f) towards the position (NI), the circuit that produces the rotation of the motor (M) and the auger (S) at high speed is closed, by an interval (AT). By reducing the speed to the one preselected by the operator, the infusion occurs, then, by the same pedal

(f), by canceling the pressure on (NI), the direction of rotation of the motor (M) changes returning with high speed during an interval (AT), thus defining the end of the infusion.

When it is desired to look for a vein, it is produced according to the flow chart of Figure 8, pressing the pedal towards its position (N2), with a reverse rotation and high speed, the motor (M) pushes back the piston (2) during an interval (AT).

When aspirating through the needle (4), if it is correctly placed in the vein, blood flow occurs, just stop pressing the pedal (f) so that, released from the action in (N2) the end of suctioning.

On the other hand, if what is desired is to carry out a continuous aspiration, proceed according to what is illustrated in Figure 9, that is:

The keyboard is selected in the keypad (figure 10)

P4 in position 2, - the throttle (f) is pressed towards the suction position (N2) (figures 3-A and 6-A), producing the rotation of the motor (M) in the reverse direction and speed preselected by the operator.

While the pressure of the pedal (f) is maintained in the zone (N2), 1 aspiration continues, interrupting as soon as the pressure is stopped in said zone of the pedal.

Each time the pedal (f) is pressed by pressing the zone (N2), the control circuit causes the motor (M) to turn in a direction that will suck blood from the vessel to indicate to the operator that it is inside the vein. Subsequently, when the same pedal (f) is pressed towards its position (NI), the vein injection of the corresponding medicine will instead occur.

Optionally and according to the representation of Figure 1-A, the syringe (a) may be located outside the housing or receptacle (d), the cylinder (1) of said syringe (a) being conveniently attached to the housing (d) by means of a clamp (16), while another clamp (16 ') relates the plunger (2) of the syringe with an inner nut (17), accessing the inside of the housing (d) through a groove (17 ') operatively practiced therein, which allows the longitudinal displacements of the clamp (16') to drive the plunger (2), said nut (17) being driven longitudinally by an auger (18) mounted on end bushings (18 '), conveniently in solidarity with the housing and collaborating with said nut (17) a guide (19) that immobilizes it in an angular or rotating direction when the auger (18) is driven by the motor (10), which will be assisted by a multiple connector (30) through which it will be connected to the circ electronic control device as illustrated in figures 11 and 12.

Two sensors (33) start and end of travel for the nut (17) collaborate in the set, directly driven by the latter in their displacements in either direction.

The injection speed, pressure, etc., will be co-controlled by the electronic circuit, and will depend on factors such as the type of medication used, the patient, etc.

The electronic circuit, according to the diagram of blocks illustrated in Figure 11, comprises a central processing unit (21) connected by means of a group of electrical conductors or bus (29), a memory (22) EPROM, to a memory (23) RAM, a a visual display device (24) or display, and a real time clock circuit (25) which, in turn, is connected to said central processing unit (21) through a second connection line ( 30).

In addition, the central processing unit (21) is connected to an adapter adapter circuit (28) that allows said central processing unit (21) to communicate with external devices such as the syringe sensor

(27), the external control (20), the stepper motor (M) and the keyboard (26), to which reference has already been made.

The data of different characteristics, such as pulses, pulse code, variable voltages, etc., from the keyboard (12), the syringe sensor (27) and the extreme control (20), are conveniently adapted by the interface circuit ( 28), so that the central processing unit (21) interprets and processes said data properly as well as that the information directed towards the stepper motor (M) arrives therein in a manner appropriate to the mode of operation of said motor .

The real time clock (25) synchronizes the sequence of operations to be carried out by the central processing unit (21), such as reading the memory (22) EPROM, reading and / or writing the memory (23 ) RAM, and the entry of data to be exposed by the visual presentation device (24).

The set of instructions or program (software), to be developed by the central processing unit (21), is stored in the memory (22) EPROM, while the information that will flow from or between external devices, or peripherals, such as the keyboard (26), the syringe sensor (27), the external control (20) , and even the visual display device (24) or display, will be stored in the memory (23) RAM, so that the central processing unit "CPU" (21) together with the memory (22) EPROM and the clock real time (25) process the information received through the interface (28), and represent the data required by the operator on the display (24)

A block scheme equivalent to that shown in Figure 11 is illustrated in Figure 12, but now a microprocessor (31) is shown, which includes the central processing unit (21), the memory (22) EPROM, the memory ( 23) RAM, the real time clock (25) and the interface circuit (28) already illustrated in figure 11. Also including in this figure 12, the step motor (M), the external control (20), the sensor syringe (27), the keyboard. (26), and the display (24), also illustrated in Figure 11, and adding a motor controller circuit (32), these blocks being linked 1 microprocessor (31) by means of the corresponding connection lines, with the exception of the stepper motor (12) shown connected to said motor controller (32).

Referring to this figure 12, continuing the description initiated in relation to figure 11, it is indicated that the microprocessor (31) controls 1 stepper motor (M) through a "drivers" circuit, or drivers, which can be to transistors, which accept in their input lines microprocessor commands (21) and generate the logic of electrical impulses necessary for the movement of the step motor (M), while providing the necessary current

(around 200 mA) to the windings thereof, counteracting the effects of high inductances in said windings, by means of a conventional diode circuit (not shown).

The functions performed by the microprocessor (31) are selected through the keyboard (26), which acts directly on terminals of said microprocessor (31), these functions being such as the selection of the speed of the stepper motor (M), variable in predetermined steps: the advance or reverse of said stepper motor (M), the reset of the display (24) and the positioning of the piston (2) corresponding to the syringe (a), figure one.

While the display (24) provides as information the volume injected by the syringe (a), and the direction of rotation of the stepper motor (M), the microprocessor (31), through the appropriate program allows to predetermine and control the amount of liquid to infiltrate, as well as suction, by the inverse rotation of the motor (M), blood from the patient's vein, to indicate that it is in the vein, as a pre-injection step.

The external control (20), can comprise the pedal (f) or a manually operated infiltrating device that includes push-buttons that enable the recoil of the plunger (2) of Figure 1 to be activated, in order to facilitate an initial blood aspiration, as well as the advance of said plunger (2) for the injection of the medicine ', this external control (20) being able to be linked to the rest of the electronic circuit by means of connecting cables, or, operated wirelessly, by means of additional circuits

The syringe sensor (27) is connected to determine the volume of medication allowed by said syringe (a), figure 1, depending on the outside diameter thereof, data that is processed by the microprocessor (31) to the correct dosage of the medicine, adjusting the speed of rotation of the stepper motor (M) and, as a consequence, the speed of advance of the piston (2) inside the cylinder (1), being the diameter of the piston (2) calibrated by means designed for this purpose including, in addition, this syringe sensor (27), a travel start sensor (14) and another piston travel end sensor (15) in the cylinder (1), those that send a signal to the microprocessor when the plunger (2) is at the end / start of said path.

The aforementioned sensors (14) and (15) are located inside the housing (d) and comprise conventional relays, being in a resting position, when they are "normal open" and so that, when a nut moves through the auger (S) reaches the end / start of the circuit, activates the relay and hits it, sending a low level signal to the adapter circuit (28), which produces the microprocessor management (31) necessary to indicate on the display (24) the end / start of the tour.

On the other hand, the syringe size sensor includes a three position wrench (for the three syringe sizes (a)), each position generates a "normal open", each position being connected to two relays. So that when the position is activated the relay is "stuck" generating a low-level signal, the three signals are connected to the terminals of the adapter circuit (28) that notify the micro in which position the key is. The latter thus activates the program stored in EPROM for the calculation of the dosage corresponding to that syringe size (a).

It should be noted that syringe sizes (a) can be standard, in which case the three positions indicated can correspond to 10, 20 and 60 cm ³ . Finally, it is noteworthy that the microprocessor (31) contains the programming of a routine of elimination of the drip of the conduit (4) due to the residual pressure, also allowing this microprocessor (31) to determine the movement of a solenoid which pushes back to the plunger (2) of the syringe (a) and of the reversal of the motor rotation (M) step by step, the 100/200 type motor being high precision step-by-turn.

Claims

R E I V I N D I C A C I O N E S

I ^a .- Dosing equipment and producer of an aspirant-impending action, applicable to phlebology and other medical uses, which using a variable capacity chamber (a), such as a syringe or similar, as an aspirant-imperative medium, is characterized in that The cylinder (1) of said syringe is conveniently connected to a housing (d), containing controlled actuating means for the plunger (2) of the syringe (a), consisting of a driving element (c) that can be operated remotely. through a pedal (f), while the hypodermic needle (7) through which the equipment is connected to the patient's vein or body cavity, is related to the syringe (A) through a flexible tube ( 4), of considerable length, which is associated with an anatomical handle (e) carrying said needle (7).

2 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according ^to claim I, characterized in that while the drive unit (c) is provided inside the housing

(d), the syringe (A) can be inside or outside said housing.

3 .- dispensing system and producing a suction-impeller, phlebology action applicable to medical and other uses according ^to claim I, wherein the drive means of the syringe (a) are constituted by a second cylinder (b), which, being a component of a pneumatic circuit, directs a conductive piston (9) which is driven to the plunger (2) of the syringe with whose rod it is connected, said pneumatic circuit comprising sets of electro-pneumatic suction valves , supply and switching (V), powered by a pneumatic pump controllable from the remote control (12) 4 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim I ^to, wherein the drive means of the syringe (a), composing a system electromechanical drive comprises a motor reversible drive whose shaft is connected to the rod through a screw that passes through a nut as a fixed hub, this engine being controlled from a remote control.

5 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim I ^to, wherein the means of variable actuation of the camera, composing a hydraulic circuit consisting of a peristaltic pump which , commanded by a reversible drive motor, forms the passage of the end of a disposable conduit, by a part connected to a reservoir of the injected product, while at the opposite end it is mounted on a command handle to end up connected to a hypodermic needle .

6 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim Ia, wherein the variable - actuation means of the camera (a) consist of a motor (10) driving an auger (18) mounted inside the housing (d) with the collaboration of end bushings (18 ') and on which a nut (17) assisted by a guide (19) also mounted on said housing (d) plays , said nut (17) being attached to a clamp (16 ') that emerges to the outside through a groove (17') of the housing and through which the nut (17) is associated with the piston (2) of the variable chamber or syringe (A), whose cylinder (1) is fixed externally to said housing (d) with 1 collaboration of another clamp (16). 7 ^a. - Dosing equipment and producer of an aspiring-impending action, applicable to phlebology and other medical uses, according to claims 1 to 6, characterized in that the remote control is provided in the equipment handle itself.

8 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses according to claims 1 to 6, wherein the remote control comprises a pedal connected to the drive means of the syringe.

9 .- dispensing system and producing an action suction-impelling applicable to phlebology and other medical uses, according to claim 7, wherein the remote control being provided in the handle of the device itself, comprises the least one switch two points, connected to the syringe drive means, they correspond to the closure of the syringe injection and injection circuits, respectively.

10 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim 7, wherein the remote control being provided in the handle of the device itself consists of two switches to switch that, connected to The syringe actuation means correspond to the closure of the suction and injection circuits of the syringe, respectively.

11 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim 8, wherein the remote control comprises a pedal that selectively activates the switches closing circuits that enable driving means of the syringe in the direction of aspiration in the injection, respectively.

12 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim 1, wherein the handle, being of anatomical conformation, is an elongated piece with intermediate bends which are two sections non-collinear corresponding to the needle holder, and to a handle, respectively.

13 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim 12, characterized in that the handle forms a cavity which defines the final longitudinal housing the end section of pipe which , passing through a tubular cylinder head nozzle corresponding to the same handle, on the opposite end is connected to the needle projected from the same handle through a clamping mandrel.

14 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim 12, characterized in that the handle consists of two halves hinged in the longitudinal direction which, forming a longitudinal cavity, housed in the same is the final section of the line whose other end is attached to the syringe's terminal nozzle, this line having the disposable character.

15 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses according to claim 1, wherein the syringe is mounted on a support removably.

16 .- dispensing system and producing an action aspirant-impeller, applicable to phlebology and other medical uses, according to claim 1, characterized in that the alternative actuation means of the syringe are controlled by an electronic circuit.

17 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim 16, wherein the electronic control circuit includes, at the least one sensor syringe assembly.

18. ^A dosing equipment and producer of an aspirant-impellent action, applicable to phlebology and other medical uses, according to claim 17, characterized in that said syringe sensor assembly comprises a syringe diameter sensor, and two positional start and At the end of each stroke of its piston, respectively, these positional sensors are each arranged at the limits of these strokes of the syringe plunger.

19. ^A dosing equipment and producer of an aspiring-impending action, applicable to phlebology and other medical uses, according to claim 16, characterized in that said control circuit includes a microprocessor connected to said syringe sensor and said external remote control.

20 .- dispensing system and producing a "suction-impelling action applicable to phlebology and other medical uses, according to claim 19, wherein said microprocessor is connected to a control keyboard.

21 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim 16, wherein the syringe assembly, and drive means are accommodated in a cabinet that includes a control and command panel.

22 .- dispensing system and producing a suction-impelling action applicable to phlebology and other medical uses, according to claim 21-, wherein the control panel includes: a switch of the suction eyección- preset volumes, a volumetric registration of the content of 1 suction-ejection chamber, a regulator of the injectable flow power, as well as that of the suction force, and an audible signal indicating each unit of measurement injected.