GB2238479A

GB2238479A - Drip infusion set

Info

Publication number: GB2238479A
Application number: GB8926835A
Authority: GB
Inventors: A-Tien Chen
Original assignee: CHEN A TIEN
Current assignee: CHEN A TIEN
Priority date: 1989-12-20
Filing date: 1989-11-28
Publication date: 1991-06-05
Anticipated expiration: 2009-11-28
Also published as: DE3942493C1; FR2655858A1; GB2238479B; FR2655858B1; GB8926835D0

Abstract

A compulsory drip infusion set practical for use in very low atmospheric pressure area without being suspended from a higher place during infusion process and having a function to give warning before exhaustion of infusion solution. A motor is used to drive an expansion rack assembly to move forward, through the operation of a speed reducer, to simultaneously force a push plate to compress infusion solution from a compressible drip bottle into patient's body. During forward motion of the rack assembly, a buzzer and a stop control switch are triggered to give an audio alarm signal and to stop the operation of drip infusion respectively. <IMAGE>

Description

Drip Infusion Set The present invention relates to a drip infusion set.

The present invention seeks to provide a portable drip infusion set which can automatically stop drip infusion and give an audio alarm when the so1"1t-I)P. contained therein is going to be exhausted and which uses a motor to drive a driving gear wheel to rotate so as to further drive an extension rack assembly to move forward and to compressi.ble drip bottle to automatically infusion process in flow rate according to setting.

compress a perform drio pre-determined Regular drip infusion is performed by suspending a drip battle frorn a drip stand so that the altitude difference will permit the solution contained in such a drip bottle to drip into patient's body through blood circulation. Because drip infusion generally needs several -o complete, it is very convenient to carry the whole hours t drip infusion set with a patient JA a patient wishes to infusion. Sometimes, revese flow of of microbes may happen when a drip bottle is not stopped before the solution contained therein is completely exhausted. Further, conventional drip set is rather difficult or impractical for use under some conditions, for example, in traffic accident, earthquake, battle or space.

discharge during blood or contamination infusion 1 An object of the present invention is to provide a drip infusion set which is portable for convenient use.

The invention will now be described further by way of example with reference to the accompanying drawings in which:- Fig. 1 is a perspective view of a compulsive drip infusion set embodying the present invention; Fig- 2 is a perspective fragmentary illustrating an internal structure of the drip infusion set of Fig. 1; Fig. 3 is a perspective view of a compression mechanism according to the present invention; Fig. 4 are sectional drawings of the compression mechanism of Fig. 3 Fig.

0 compression Fig.

is a perspective view of mechanism according to the 6 illustrates the outer embodiment of the present invention; and Fig- 7 illustrates the use bv a over one's k an alternate form oresent invention; appearance o:

J_ a r.

of the present shoulder.

2 Z I.

Turning now to the annexed drawings in therein illustrated is a compulsive drip greater infusion compr.iL.sed sm, mechan.

detail set o f 1 ' 12 a speed reducer 13 and a driving gear wheel 14, and a compression mechanism 2, which is comprised of a rack holder 24 a main rack 23 sliding in said rack holder 24 and therein a slide way 231, an auxiliary rack 22 n said slide wav 231 of said main rack 23 em.bodying-the present invention and a housing 5 having received therein generally a driving which is compr--.s,--d of a rechargeable batter- 1-, a 1 def ining s l id-ing i push plate 2 mo t o l, and a The compression mechanism 2 is expansible so as to minimize space consumption for convenient carriage with a patient. As illustrated, the main rack 23 is set to slide in the j shaped rack holder 24 and comprises a toothed portion 23a on its top and arranged in length shorter than the total length of the main rack 23 with a flat top surface (as shown in Fig. 3) left in its front. The auxiliary rack 3 22 includes a toothed portion 22a over all of its surface and is set to slide in the shaped slide way During assembly, the toothed portions 22a and 23a of main and auxiliary racks 22 and 23 may be engaged with driving gear wheel 14. The push plate 21 is secured to auxiliary rack 22 at its front end and driven to compress a drip bottle 3.

top t 231. the the the When the driving gear wheel 14 is driven to rotate bv the motor 12 through the speed reducer 113, it will carry the auxiliary rack 222 to move forward and simultaneously 1 push the connected push plate 21 to squeeze a compressible -e 31. In order to drip bottle 3 against a check plat -ninmize the size of an infusion set for convenient carriage - L - - with oneself, the length of the auxiliary rack 22 is most preferably about half size of a compressible drip bottle 3.

The auxiliary rack 22 comprises a pair of fins 2 2 bilaterally disposed at its rear end. The a stop pin 232 inserted therethrough from thereof to slightly project into the slide arecting the sliding of the auxiliary ff When the auxiliary rack 22 is driven by the main rack 23 has one lateral side without therein.

driving gear wheel 14 to move forward to its maximum extent, the fins 221 thereof are stopped by the stop pin 232, and as a consequence, the main rack 23 is then carried to move forward permitting its toothed portion 23a to be engaged with the driving gear wheel 14. Thus, the driving gear way 231 rack 4 Z.

7 Z1 wheel. 14 will disengage from the auxiliary rack 22 and fully engage with the main rack 23 when it is continuously driven to rotate, so as to further carry the main rack 23 to move forward.

-he push plate 21 Because t is connected to the P. 1 X 1 4 -: r -:, ---t:

221 at its front end and driven to comioress a compressible drip battle 3, forward push force appled on the push plate 21 may be stopped when the auxiliary rack 22 is released from its engaged position with the driving gear wheel 14. In order to eliminate this problem, certain arrangement must be made. According to the present invention, a convex push block 223 -is made on the auxiliary rack 9-2 on its bottom, and a retaining groove 222 is made on t Lhe auxiliary rack 22 on its bottom between the convex push block 223 and the fins 221 of the auxiliary rack 22. When the fins 221 are stopped by the stop pin 232 in the slide way 231, the push block 223 simultaneously pushes a front end of a shift pawl 233, which is rotatably mounted on a pivot pin -2-33a in an opening 235 inside the slide way 231 of the main rack 23, permitting a hook end 233b of such a shift pawl 233 to be lifted to engage with the retaining groove 222 of the auxiliary rack 22, such that the auxiliary rack 22 can be continuously pushed by the main rack 23 to move forward.

In addition to the expansion rack assembly which minimizes space consumption of the present invention, another feature of the present invention is an alarm and automatic stop mechanism. When the toothed portion 23a of the main rack 23 is driven by the driving gear wheel 14 to -ion with the driving gear move to an end in an engaged posit wheel 14 (that is, a compressible drip bottle 3 received ---o be compressed to its limit therein is about 11 the stop t plate 234 first triggers a micro-switch 51, which is mounted on the housing 5, to turn on a buzzer (not shown) to give an audio alarm sianal, and then, triggers another micro-switch 52 to turn off the motor 12.

When a drip bottle 3 is used up, ±'--.,e motor -12 is 1..urne( on, by inteans of a control switch 553 which is mounted -o -he so as on 11 Ilousing 5, to rotate in counter direction, drive the driving gear wheel 14 to carry the the main rack -her carry the auxilliary rack 22 22 to move back, and to furt to move back to original. position by means of the engagement of the stop pin 232 of the main rack with the fins 221 of the auxiliary rack 22. As soon as the main rack 23 is retreated before its toothed portion 23a is completely disengaged from the driving gear wheel 14, the driving gear wheel 14 becomes in engagement with the toothed portion 22a of the auxiliary rack 22 to drive the auxiliary rack 22 to continuously move back. At the same time, the bottom push block 223 of the auxiliary rack 22 pushes the rear end of the pawl 233-permitting the hook end 223b of the pawl 233 to disengage from the retaining groove 222 such that the 6 auxiliary rack 22 can be smoothly driven to slide backward into the slide way 231 of the main rack 23.

In order to prevent the main and auxiliary racks from separating from the. rack holder 24 during housing at the a stop block 54 s made on 11 23 ad 22 retreating, back against of the main rack 22 also at its-front move back to stop pin 232 of the main rack 23 to confine the backward movement of the auxiliary rack 22 within a suitable range.

the main rack 23 to limit the backward movement and auxiliary racks 23 and 22. The auxiliary bilaterally disposed rack 22 is driven to are stopped by the comprises two tenons 224 end. When the auxiliary its limit, the tenons 224 According to the present invention, the use of the main and auxiliary racks 23 and 22 are to minimize space consumption of the present invention. The number of main and auxiliary racks used in an infusion set may be increasedfrom the foregoing double-rack (23 and 22) type to a triplerack type, as shown in Fig. 5, so that the total length of an drip infusion set can be relatively reduced.

In order to accelerate the backward movement of the compression mechanism 2, a control knob 55 is made on the housing 5 to regulate the revolving speed of the motor 12 through a speed regulator (not shown) so as to rapidly driven the main and auxiliary racks 23 and 22 to move back to start position for next operation and to flexibly control 7 the infusion flow rate of a compressible drip bottle 3. A liquid crystal display 56 is mounted on the housing 5 at one lateral side, through which infusion 4..LOW rate can be clearly seen.

4'ary racks and ecause- -'the main and auxin the housing 5 to dr4ve 'he Dush plate tle 3, a groove an a compressible drip bott made on the housing 5 for sliding there4n arm 2111, wherein the groove 55 is internally on the housing 5 through the top surface of the 'he support arm and has its one its other end driven by the 21 to smoothly received compress nternally support disposed area whereto a drip bottle 3 is placed, and 27' is -.-yert4cat'v disposed in the groove 55 end connected to the push plate 21 a-nd connected to the auxiliary rack 22 and is auxiliary rack 22 to force 'he push plate compress on a drip bottle 3 therein.

12 are 2 255 o f As an alternate form of the present inve-ntion, a power connector is connected to the micro-switch 51 and received in the housing 5 for - further connection interphone or alarming equipment in a hospital room so call a nurse station or turn on an alarm lamp in a station when the infusion solution in a compressible bottle 3 is going to be e:hausted.

to an as to nurse drip As described above, a compulsive drip infusion set 8 z of the present advantages:

1. The present invention is motorized, and the infusion speed can be adjusted according to requirement. Therefore, a constant and most suitable infusion speed can be obtained in the most accurate and simple way without through visual check as in the conventional drip infusion set.

invention can attain the fo-1lowing five Because the present invention adopts compulsory infusion operation, a drip infusion set of the present -hout suspending =vention can be placed at any location wit- 1 1 i rorn a higl---1er posJ t on.

3. Because the present utilizes a small motor, a sma-11 speed reducer, a dr4p infusion set of the present invent-Lon 4S very convenient for transportation and very practical for use in rude terrains, such as for use in or in an emergency.

lirst-aid - mountaineerIng accident 4. A handle or shoulder belt car. be attached to the Dresent invention for convenient carriage with oneself or a patient.

5. Because the present invention adopts compulsory -1e can be infusion process, the infusion of the a drip bott- efficientlIv operated and will not be interfered with atmospheric pressure. Even in a zero gravity space, the present invention can still be efficiently operated.

9

Claims

CLAIMS -nc'uding a A compulsory drip infusion set, housing having received

therein:

a compressible drip bottle for containj-.ng infusion solution; rack holder..

main rack set in said rack holder and compr-s--'--g -4on partly covering the top sur..

a toothed port- Eace thereof defining a f-1.at top front end, a slIde way therein, a stop pin penetrated therethroug11-. from one lateral side to slightly project into said slide way, and a stop plate all Its rear end; an auxiliary rack movably set in said slide way of- said main rack and comprising a toothed portion cover4ng the whole top surface thereof, and a push plate connected thereto at the front end, a pair of fins bilaterally l.s rear end, and a pair of tenons bilaterally disposed at i disposed at its front end; and a driving gear wheel internally positioned in said rack holder at an upper position and to alternatively engage W.: 4-1, -ion sai the toothed port Ld main rack and the toothed portion of said auxiliary rack, said driving gear wheel being driven by a motor through a speed reducer to carry said main and auxiliary racks to move forward or backward; characterized in that the rotation of said driving gear wheel drives said auxiliary rack to move forward to further carry said main rack to move forward through the j 1 engagement of said fins of said auxiliary rack with stop pin of said main rack, permitting the toothed portion of said main rack to be engaged with said driving gear wheel.
2. A compulsory drip infusion set according to claim 1, wherein a convex push block and a retaining groove are respectively made on said auxiliary rack on. its bottom th said retaining groove disposed between said convex push block and said fins, and a shift pawl is rotatably mounted on a pivot pin set in an opening inside said slide way of sad main rack, said shift pawl- being lifted to engage with -a4n4ng groove, when the rear end of said auxii- said rell to move toward the front end of said man rack is driven t.1 1 rack, permitting said auxiliary rack to be pushed by main rack to move forward.
3 A - according to compulsory drip infusion sell r W'-------Ln said fins and tenons of said auxiliary rack are -esDectJive'- iv stopped by said stop pin- or- said main rack Pn, backward. motion to prevent breaking awa y of saie au.'.-.l---ary rack from said main rack.
1 z. A compulsory drip infusion set according to a groove is internally made on Eaie h-ousing in parallie'. with. and below said drip bottle for sliding therein of a support arm, said support arm being vertically disposed 11 in said groove and having its one end connected to said push plate and its other end connected to said auxiliary rack so that it can be driven by said auxiliary rack to force said push plate to smoothly compress on said drip.bottle.
A compulsory drip infusion set according to claim 1, wherein an additional rack which has therein a slide way for setting therein of said main and auxiliary racks is received in said rack holder and carried to move forward by said driving gear wheel.
6. A compulsory drip infusion set according to claims 1 and 5, -,.7hereJ-- said additional rack has a pivoted shift pawl made on- 4s slide way and said main rack has a - -L convex push block and a retaining groove respective3JY made -4-om.

or. its bo4
7. A compulsory dri t according to -P infUS4on sel claim wherein two micro-switches are mounted on said and triggered by said s,op plate of sa. main rack h- o u z i n 9 4_ d to resl:)ec' -urn on an alarm or turn off said motor.

1 1-ively 1
8. A compulsory drip infusion set according to claim 11, wherein said motor is connected to a speed regulator through which the forward and backward revolving -rolled.

speed of said motor can be cont 12 Q.

i 1
9. A drip infusion set substantially as herein described with reference to and as illustrated in the accompanying drawings.

published 1991 at The Patent Office. State House. 66/71 High Holborn, London WCIR47P. Further copies may be obtained from Sales Branch. Unit 6, Nine Mile Point. Cwmf:linfach. Cross Keys. Newport. NPI 7HZ. Printed by Multiplex techniques ltd, St Mary Cray, Kent.