CN2194180Y

CN2194180Y - Intravenous injection aid

Info

Publication number: CN2194180Y
Application number: CN 94217774
Authority: CN
Inventors: 王宗振; 韦登谷; 阮智勇
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-07-30
Filing date: 1994-07-30
Publication date: 1995-04-12
Anticipated expiration: 2004-07-30

Abstract

The utility model relates to a vein injection booster which is an apparatus of automatically impelling an injector piston rod. An electric machine (14) is controlled to rotate by an electrical apparatus element, and a push support (5) is driven by a leading screw (19) to impel an injector (11). A return stroke mechanism composed of a telescopic pin shaft (7), a pressure spring (1), a cam indicating needle (6) and a tension spring (18), a braking mechanism for preventing reverse rotation is also arranged, and the braking mechanism for preventing the reverse rotation is composed of a braking apparatus (29) and a coupling (16). The utility model has the advantages of simple structure, reliable work and convenient operation.

Description

Intravenous injection aid

This utility model relates to a kind of intravenous injection apparatus, especially automatically the apparatus of pushing syringe piston rod.

As everyone knows, when carrying out intravenous injection, because the high-carbohydrate medicinal liquid coefficient of viscosity is big, nurse's hand push is quite painstaking, and due to illness people's body constitution, sick kind are and different again to inject speed, and it is improper to push away fast speed, easily brings misery even disaster to patient." intravenous injection aid " of Chinese patent CN2110487U bulletin is the same with other boosters, the problems referred to above have fundamentally been solved, it is by casing, motor, worm gear, worm screw, screw mandrel and intravenous injector are formed, screw mandrel is positioned on the casing upper inside wall, the worm gear of one end is connected with motor output shaft by the worm screw that is engaged with, syringe is positioned at the casing upper grooves, and the tail end of its injection tube fixes in the arcuate groove of indent, but be set with the backhaul propulsion plant on the screw mandrel, it is by half-axile sleeve, augering screw, push rod and spring are formed, this device rotates with screw mandrel and moves forward and backward, and its push rod is positioned at the rear portion of syringe piston rod tail end.This booster has adopted the half-axile sleeve of requirement on machining accuracy height, functional reliability difference, and the operation of backhaul mechanism is not very convenient yet, and promptly mechanical part also is not an optimal design.

The purpose of this utility model is a kind of intravenous injection aid of design, and it has the syringe piston pushing mechanism of reliable operation and easy to operate push rod backhaul mechanism.

For achieving the above object, this utility model adopts following technical scheme, be fixed with bearing block (8), (23) of supporting leading screw (19) under box body (25) top panel, leading screw (19) one ends are connected with motor (14) by shaft coupling (16), be with brake frame (28) on motor (14) axle, brake frame (28) is connected with brake (29) by bearing pin (15).Box body (25) top panel is provided with a chute (17), and pipe (3) passes chute (17), and sliding sleeve (21) is enclosed within on the leading screw (19), and the boss and pipe (3) end of its upper end are fixed.Place flexible bearing pin (7) in the pipe (3) to pass the boss of sliding sleeve (21) upper end and snap in the tooth nest of leading screw (19), flexible bearing pin (7) hypomere outside is with stage clip (1), the upper end peaks at the cam lower edge of cam pointer (6), pipe (3) outer rim is with pushing and withstanding holder (5), be fixed with clamper on box body (25) top panel, there is a pulley (24) bearing block (23) below, extension spring (18) one ends are fixed on the box body (25), other end splicing (20), rope (20) are walked around on the screw (22) that pulley (24) is fixed on sliding sleeve (21) bottom.The rotating speed of motor (14) is controlled by a frequency-adjustable speed-adjustable circuit, described frequency-adjustable speed-adjustable circuit is made up of power circuit, FM circuit, pushing grade circuit and power output circuit, produce the pulse signal of frequency and EDM Generator of Adjustable Duty Ratio by FM circuit, deliver to power output circuit via pushing grade circuit, after power output circuit amplification, filtering, the sine wave signal of output frequency and adjustable amplitude value is added on the coil of motor (14).

The seat of clamper (13) is connected with eyelet bolt (10) one ends by bearing pin (27), and eyelet bolt (10) other end is threaded with nut (26), and seat (13) is connected by hinge (9) with carriage (12).Leading screw (19) screw thread is a rectangular thread, and flexible bearing pin (7) is the flat-nosed cylinder body.FM circuit comprises by resistance R in the frequency-adjustable speed-adjustable circuit of control motor speed ₅, R ₆, R ₇, R ₈, potentiometer WT and transistor BG ₁The emitter follower of forming; By not gate IC ₁, IC ₃, resistance R ₂, R ₃, capacitor C ₆, C ₇The voltage controlled oscillator of forming; By time base circuit IC ₇1/2 and resistance R ₁₁, capacitor C ₁₀The monostable circuit of forming; By time base circuit IC ₇1/2 and resistance R ₉, R ₁₀, capacitor C ₈, C ₉The square wave generation circuit and the NAND gate IC that form ₃, IC ₄, not gate IC ₅, IC ₆, by transistor BG ₁In the emitter follower of forming, divider resistance R ₅, WT, R ₆After the series connection successively with transistor BG ₁Colelctor electrode, base stage and ground wire join emitter resistance R ₇, R ₈Be serially connected with between emitter-base bandgap grading and ground wire described not gate IC ₁, IC ₂Resistance R in the voltage controlled oscillator of forming ₂, R ₃Be connected to not gate IC respectively ₁, IC ₂Input, capacitor C ₇Be connected to not gate IC ₁Output and IC ₂Input, capacitor C ₆Be connected on not gate IC ₂Output and IC ₁Input between, described by time base circuit IC ₇1/2 monostable circuit of forming in resistance R ₁₁Be connected on 14 on foot 13 and foot, foot 12,13 passes through capacitor C ₁₀Ground connection; By time base circuit IC ₇The 1/2 square wave generation circuit of forming in resistance R ₁₀Ground connection, capacitor C ₈Series connection is on input pin 1, and input pin 1 passes through resistance R ₉Join input pin 2,6 and resistance R with power Vcc ₁₀, capacitor C ₈Node join ground capacity C ₉Be connected on the input pin 3, by emitter follower emitter resistance R ₇, R ₈Node extraction voltage control signal through resistance R ₄Deliver to the input pickup resistance R of voltage controlled oscillator ₂, R ₃, the symmetrical square wave signal u of the frequency adjustable that produces by voltage controlled oscillator ₁, u ₂Deliver to NAND gate IC ₃, IC ₄Two inputs, by time base circuit IC ₇1/2 and resistance R ₉, R ₁₀, capacitor C ₈, C ₉The square-wave signal u of the square wave generation circuit output of forming ₃From IC ₇Input pin 8 enter by time base circuit IC ₇In addition 1/2 monostable circuit of forming, by transistor BG in the emitter follower ₁The voltage signal of exporting on the emitter-base bandgap grading is delivered to IC ₇Foot 11, become the control signal of monostable circuit, by the pulse signal u of monostable circuit output ₄Enter NAND gate IC ₃, IC ₄In addition two inputs, this pulse signal u ₄Square-wave signal u with the voltage controlled oscillator generation ₁, u ₂Through NAND gate IC ₃, IC ₄Behind the superposition, the superposition signal u of generation ₅, u ₆Through NAND gate IC ₅, IC ₆Carry to pushing grade circuit.

Pushing grade circuit is by transistor BG in the frequency-adjustable speed-adjustable circuit of control motor (14) rotating speed ₂, base resistance R ₁₂, emitter resistance R ₁₄Transistor BG ₃, base resistance R ₁₃, emitter resistance R ₁₅Symmetrically arranged one group of follower of forming, the frequency of sending by FM circuit and the pulse signal u of EDM Generator of Adjustable Duty Ratio ₅', u ₆' from base resistance R ₁₂, R ₁₃Input exports the power output amplifier to from the two transistor emitter-base bandgap grading.

The power output amplifier is by transistor BG in the frequency-adjustable speed-adjustable circuit of control motor (14) rotating speed ₄, BG ₅With transformator T ₂The push-pull amplifier circuit of forming, the output signal of push-pull amplifier circuit is by transformator T ₂Inferior coil pressurization motor (14) on.

Its control principle is as follows, and producing frequency by voltage controlled oscillator can be from the square wave u of 40-60HZ ₁, u ₂, the square wave generation circuit generation frequency that is made of 1/2 of time base circuit is the square-wave signal u of 5KHZ ₃, its dutycycle is 50%, this signal inputs in addition 1/2 monostable circuit that constitutes by time base circuit, by by transistor BG in the emitter follower ₁The voltage signal of drawing on the emitter-base bandgap grading produces and u monostable circuit ₃Identical, dutycycle can be adjusted to 95% pulse signal u from 50% ₄, (u ₄The adjusting of dutycycle must be coordinated with the frequency adjustment of voltage controlled oscillator, when guaranteeing that the voltage controlled oscillator output signal frequency is low, and u ₄Dutycycle little, when frequency is high, u ₄Dutycycle big.) dutycycle that produces of monostable circuit, the pulse signal u of frequency adjustable ₄With a pair of FM signal u that produces by voltage controlled oscillator ₁, u ₂Input to NAND gate IC simultaneously ₃, IC ₄Input, through the effect of NAND gate, with superposition signal u ₅, u ₆Deliver to inverter ic ₅, IC ₆, by phase inverter these two inversion signals are delivered to pushing grade circuit and power output circuit again, be added on the coil of motor (14) by the sine wave signal of power output circuit, thereby control its rotating speed frequency and adjustable amplitude value.

By such scheme as seen, the piston pushing mechanism mainly is made of the circular flexible bearing pin (7) of leading screw (19), the tack of band rectangular teeth screw thread, simple and the reliable operation of technology, backhaul mechanism mainly is made of stage clip (1), cam pointer (6), extension spring (18), rope (20) and pulley (24), and the backhaul operation reaches to convenient.

Description of drawings:

Fig. 1 structural representation

The A-A cut-away view of Fig. 2 Fig. 1

Fig. 3 controls the frequency-adjustable speed-adjustable circuit frame principle figure of motor (14) rotating speed

Fig. 4 frequency-adjustable speed-adjustable circuit electrical schematic diagram

Fig. 5 frequency-adjustable speed-adjustable circuit power circuit theory diagrams

Fig. 6 acoustics circuit schematic diagram

The utility model is described in further detail below in conjunction with most preferred embodiment and accompanying drawing, referring to Fig. 1,2, sliding sleeve (21) and leading screw (19), adopt matched in clearance between the flexible bearing pin (7), pipe (3) and pushing and withstanding holder (5), also be matched in clearance between the chute (17), unclamp nut (26) the turn-off eyelet bolt (10) that can make progress, close eyelet bolt (10) and locking nut (26) after inserting syringe (11), during starter motor (14), driving leading screw (19) by shaft coupling (16) rotates, when rotating counterclockwise, drive pushing and withstanding holder (5) pushing syringe (11) piston by flexible bearing pin (7), the tensioning of extension spring (18) simultaneously, during to extreme position, will touch Fig. 4, travel switch among Fig. 6 makes motor (14) stall and acoustics circuit work; When clockwise rotating, referring to Fig. 2, because all making annular knurl, handles the field of conjugate action of brake (29) and shaft coupling (16), brake (29) will rotate counterclockwise and stuck around bearing pin (15), because motor (14) is an alternating current generator, thereby oppositely rotates counterclockwise immediately.The backhaul operation is as follows, Fig. 1 cam pointer (6) is pulled when the left, under the effect of stage clip (1), move the tooth nest of jumping out leading screw (19) on the flexible bearing pin (7) and return under the tensile effect of extension spring (18), cam pointer (6) is pulled when right-hand, entered the SBR of next time working.Carriage (12) rotates around bearing pin (9) is convenient to folding and unfolding.In the frequency-adjustable speed-adjustable circuit of control motor (14) rotating speed, form the transistor of penetrating grade follower and can adopt silicon high frequency low power tube, as 3DG6,3DG12 etc., the transistor of forming push-pull amplifier circuit can adopt the low-frequency high-power pipe, the not gate IC in the circuit ₁, IC ₂, IC ₅, IC ₆, NAND gate IC ₃, IC ₄Can adopt simple gate, also can adopt two 42 input nand gates, the time base circuit of forming monostable circuit can adopt NE556 time base circuit sheet.

Claims

1, intravenous injection aid is fixed with bearing block (8), (23) of supporting leading screw (19) under box body (25) top panel, it is characterized in that:

A, leading screw (19) one ends are connected with motor (14) by shaft coupling (16), are with brake frame (28) on motor (14) axle, and brake frame (28) is connected with brake (29) by bearing pin (15);

B, box body (25) top panel are provided with a chute (17), pipe (3) passes chute (17), sliding sleeve (21) is enclosed within on the leading screw (19), the boss and pipe (3) end of its upper end are fixed, place the flexible bearing pin (7) of the interior bottom of pipe (3) to pass the boss of sliding sleeve (21) upper end and snap in the tooth nest of leading screw (19), flexible bearing pin (7) hypomere outside is with stage clip (1), the upper end peaks at the cam lower edge of cam pointer (6), pipe (3) outer rim is with pushing and withstanding holder (5), is fixed with clamper on box body (25) top panel;

There is a pulley (24) c, bearing block (23) below, and extension spring (18) one ends are fixed on the box body (25), and other end splicing (20), rope (20) are walked around pulley (24) and be fixed on sliding sleeve (21) bottom;

The rotating speed of d, motor (14) is controlled by a frequency-adjustable speed-adjustable circuit, described frequency-adjustable speed-adjustable circuit is made up of power circuit, FM circuit, pushing grade circuit and power output circuit, produce the pulse signal of frequency and EDM Generator of Adjustable Duty Ratio by FM circuit, deliver to power output circuit via pushing grade circuit, after power output circuit amplification, filtering, the sine wave signal of output frequency and adjustable amplitude value is added on the coil of motor (14).

2, intravenous injection aid according to claim 1, it is characterized in that: the seat of clamper (13) is connected with eyelet bolt (10) one ends by bearing pin (27), eyelet bolt (10) other end is threaded with nut (26), and seat (13) is connected by hinge (9) with carriage (12).

3, intravenous injection aid according to claim 1 is characterized in that: leading screw (19) screw thread is a rectangular thread, and flexible bearing pin (7) is the flat-nosed cylinder body.

4, intravenous injection aid according to claim 1 is characterized in that controlling that FM circuit comprises by resistance R in the frequency-adjustable speed-adjustable circuit of motor speed ₅, R ₆, R ₇, R ₈, potentiometer WT and transistor BG ₁The emitter follower of forming; By not gate IC ₁, IC ₃, resistance R ₂, R ₃, capacitor C ₆, C ₇The voltage controlled oscillator of forming; By time base circuit IC ₇1/2 and resistance R ₁₁, capacitor C ₁₀The monostable circuit of forming; By time base circuit IC ₇1/2 and resistance R ₉, R ₁₀, capacitor C ₈, C ₉The square wave generation circuit and the NAND gate IC that form ₃, IC ₄, not gate IC ₅, IC ₆, by transistor BG ₁In the emitter follower of forming, divider resistance R ₅, WT, R ₆After the series connection successively with transistor BG ₁Colelctor electrode, base stage and ground wire join emitter resistance R ₇, R ₈Be serially connected with between emitter-base bandgap grading and ground wire described not gate IC ₁, IC ₂Resistance R in the voltage controlled oscillator of forming ₂, R ₃Be connected to not gate IC respectively ₁, IC ₂Input, capacitor C ₇Be connected to not gate IC ₁Output and IC ₂Input, capacitor C ₆Be connected on not gate IC ₂Output and IC ₁Input between, described by time base circuit IC ₇1/2 monostable circuit of forming in resistance R ₁₁Be connected on 14 on foot 13 and foot, foot 12,13 passes through capacitor C ₁₀Ground connection; By time base circuit IC ₇The 1/2 square wave generation circuit of forming in resistance R ₁₀Ground connection, capacitor C ₈Series connection is on input pin 1, and input pin 1 passes through resistance R ₉Join input pin 2,6 and resistance R with power Vcc ₁₀, capacitor C ₈Node join ground capacity C ₉Be connected on the input pin 3, by emitter follower emitter resistance R ₇, R ₈Node extraction voltage control signal through resistance R ₄Deliver to the input pickup resistance R of voltage controlled oscillator ₂, R ₃, the symmetrical square wave signal u of the frequency adjustable that produces by voltage controlled oscillator ₁, u ₂Deliver to NAND gate IC ₃, IC ₄Two inputs, by time base circuit IC ₇1/2 and resistance R ₉, R ₁₀, capacitor C ₈, C ₉The square-wave signal u of the square wave generation circuit output of forming ₃From IC ₇Input pin 8 enter by time base circuit IC ₇In addition 1/2 monostable circuit of forming, by transistor BG in the emitter follower ₁The voltage signal of exporting on the emitter-base bandgap grading is delivered to IC ₇Foot 11, become the control signal of monostable circuit, by the pulse signal u of monostable circuit output ₄Enter NAND gate IC ₃, IC ₄In addition two inputs, this pulse signal u ₄Square-wave signal u with the voltage controlled oscillator generation ₁, u ₂Through NAND gate IC ₃, IC ₄Behind the superposition, the superposition signal u of generation ₅, u ₆Through not gate IC ₅, IC ₆Carry to pushing grade circuit.

5,, it is characterized in that pushing grade circuit is by transistor BG in the frequency-adjustable speed-adjustable circuit of described control motor (14) rotating speed according to the described intravenous injection aid of claim 1 ₂, base resistance R ₁₂, emitter resistance R ₁₄Transistor BG ₃, base resistance R ₁₃, emitter resistance R ₁₅Symmetrically arranged one group of follower of forming, the frequency of sending by FM circuit and the pulse signal u of EDM Generator of Adjustable Duty Ratio ₅', u ₆' from base resistance R ₁₂, R ₁₃Input exports the power output amplifier to from the two transistor emitter-base bandgap grading.

6,, it is characterized in that the power output amplifier is by transistor BG in the frequency-adjustable speed-adjustable circuit of described control motor (14) rotating speed according to the described intravenous injection aid of claim 1 ₄, BG ₅With transformator T ₂Diode D ₁, D ₂, capacitor C ₁₃, C ₁₄, C ₁₅, C ₁₆The push-pull amplifier circuit of forming, the output signal of push-pull amplifier circuit is by transformator T ₂Secondary coil be added on the motor (14) diode D ₁, D ₂, capacitor C ₁₃, C ₁₄, C ₁₅, C ₁₆Be symmetricly set on transistor BG ₅, BG ₆Output and transformator T ₂Primary coil between.