CN103041476A

CN103041476A - Adjustable Metering Syringes

Info

Publication number: CN103041476A
Application number: CN2012105280442A
Authority: CN
Inventors: 邓源基
Original assignee: Individual
Current assignee: Zhongshan Huifeng Medical Packing Technology Co Ltd
Priority date: 2012-12-04
Filing date: 2012-12-04
Publication date: 2013-04-17
Anticipated expiration: 2032-12-04
Also published as: CN103041476B

Abstract

The invention relates to an adjustable metering injector which is convenient to use and carry, and comprises a pen cap, a needle head, an injection tube which is internally provided with a piston and is pre-filled with a liquid medicine agent, an injection sleeve, a connecting tube, a screw rod, a nut sleeve, an adjusting coil and a button, wherein a spiral groove on the outer wall of the adjusting coil is mainly coupled with a spiral rib on the inner wall of a guide tube; when the button is pressed down, the backward direction of the driving coil is blocked, the driving coil passes through the pawl tube and the clutch block to drive the screw rod to rotate, and the screw rod moves forwards through the coupling with the nut sleeve so as to push the piston in the injection tube to enable the liquid medicine agent in the injection tube to be ejected outwards. A clutch spring is arranged between a pawl tube and a clutch block, and the clutch block is separated from the pawl tube when an injection sleeve is not inserted into a connecting tube.

Description

The adjustable dosage syringe

Technical field

The present invention relates to a kind of syringe, particularly relate to a kind of syringe of adjustable dosage.

Background technology

At present diabetes patient or some need the patient of self-medication often need to carry out liquid medicine injection to oneself in different occasions, and common patient is both inconvenient and can not effectively reach accurate medication in the process of using old-fashioned disposable syringe.

Disclose among the disclosed Chinese patent CN201055550Y on May 7th, 2008 a kind of " exempting from pain formula insulin injection pen ", mainly contain to launch box, needle set folder, clutch key, ejection-spring, entry needle, pin lid and touch metering device and form, launching box is cuboid or cylinder, be equipped with on the box and touch metering device and clutch key, the needle set folder latch recess of the slip that the reed on the clutch key is in-built with launching box matches, needle set presss from both sides by ejection-spring and launches between the box and links, the needle set folder is for inserting fixedly entry needle, and entry needle is sprung into subcutaneous during injection by ejection-spring; Touch metering device and formed by touch probe, dosage card, the edge of a knife matched doses card that touch probe protrudes, probe and the interconnected one of piston rod.

A kind of " insulin syringe " disclosed among the Chinese patent CN100453128C that authorized on January 21st, 2009, it can be rotating shaft only as the forward gear of piston, be applied to normal load on the rotating shaft with removal, thereby promoted ruggedness; This auto injector for insulin comprises a syringe, it has an injector of section's splendid attire insulin within it, with one be inserted into the injector rear end, the piston of the blowdown presssure of insulin is provided for injector, one has the housing that the syringe that is formed at the appropriate location receives the space, syringe receives the space and has the partition wall that is formed at its rear end, rotating shaft with noncircular cross section and predetermined length, be used for rotating at a predetermined velocity the supply unit of rotating shaft, the push pedal assembly that onward impulse is provided for piston by pushing piston, the push pedal assembly has one and forms externally threaded integrated disc portions at its external peripheral surface, the conjugate foramen of therein heart part and the axial combination of rotating shaft, rotating shaft passes conjugate foramen, and rotating shaft passes conjugate foramen and can seesaw; Cylindrical push pedal housing with a hollow, the syringe that it is inserted into the syringe rear end receives in the space, and piston is therefrom passed, and the push pedal housing forms female thread at inner circumferential surface, the external screw thread of itself and disc portion engages, and seesaws with making plate-like part thread helix.

The patent scheme of above-mentioned two kinds of relevant syringes otherwise exist volume large, be not easy to carry, or have inconvenient problem with use.

Summary of the invention

The objective of the invention is for solve the volume that exists in the existing insulin syringe large, be not easy to carry or inconvenient problem with use, and provide a kind of adjustable dosage syringe easy to use, portable

The object of the present invention is achieved like this: a kind of adjustable dosage syringe, comprise the cap for brush, syringe needle, built-in piston and pre-installed injection pipe, injection sleeve pipe, connection tube, screw rod, nut sleeve, adjusting coil and the button of liquid medicine agent, wherein the liquid medicine agent in the injection pipe is injected by the pharmaceutical factory and is used piston seal; It is characterized in that described connection tube is divided into leading portion and back segment along the spacer ring that inwall is provided with annular with connection tube, the external diameter of the through hole of these spacer ring central authorities and ratchet pipe slides and matches, described ratchet pipe is provided with ratchet and the unidirectional ratchet that is arranged on described connection tube inwall and matches and make the described ratchet pipe can be with respect to described connection tube along the positive direction rotation and can not be along opposite spin, between described ratchet pipe and the described connection tube vertically limited ratchet on the described ratchet pipe and the unidirectional ratchet in the described connection tube of making effectively mesh described ratchet pipe front end edge annular inner wall several axial teeth groove that evenly distribute; Tangent plane behind the one side cut-out screw thread of screw rod and the axle of described screw rod are parallel to each other, in the hole that described screw rod leading portion passes clutch block central authorities and the nut sleeve lead after the screw thread couple screw rod head at described screw front end engage one can be with respect to cutting somebody's hair that screw rod head rotates, the inwall in the hole of described clutch block central authorities is provided with guiding rib and matches with the tangent plane of described screw rod and make and be slidingly matched vertically between described clutch block and the screw rod and can not relatively rotate, described clutch block rear portion be provided with described ratchet pipe on the teeth groove clutch tooth that slides and to match, described nut sleeve is positioned at the leading portion of described connection tube and this nut sleeve and is provided with and prevents that nut sleeve with respect to the directed wing of described connection tube rotation, is being provided with brake spring between described ratchet pipe and the described nut sleeve or between described ratchet pipe and described clutch block; Described connection tube rear end is fixedly connected with the conduit that inwall is provided with spiral bar, the helicla flute on described adjusting coil surface and the coupling of the spiral bar in the described pipe inner wall, the annular end face at described adjusting coil rear portion is provided with equally distributed some location end face groove, and two sides of described location end face groove are the inclined-plane; Axial ribs on the driving coil outer wall that stretches into along described adjusting coil rear end and the axial groove on the described ratchet inside pipe wall slide and match, and the pressure tooth on the end wing leading flank of described ratchet pipe rear end and the location end face groove on the described adjusting coil match; Described adjusting coil tail end is furnished with and can with respect to the button of described adjusting coil rotation, between described adjusting coil and button button spring be set;

During use, the described adjusting coil of opposite spin, under the spiral bar of the helicla flute of described adjusting coil and described conduit interacts, make and regulate coil and retreat, be delivered to the reverse rotation power that drives coil therebetween making pressure tooth pressure on the described driving coil end wing under the effect of described button spring elastic force in regulating the location end face groove of coil, by driving the outer axial ribs of coil, axial groove in the ratchet pipe is delivered to the ratchet pipe again, under the unidirectional ratchet effect of the ratchet of ratchet pipe and described connection tube, described ratchet pipe and drive coil all can not opposite spin, and make drive coil can only overcome described button spring under the interaction of described location end face groove and described pressure tooth elastic force vertically backward mobile making press tooth to slip in the end face groove of next location, judge that according to the Warning Mark on the outer tube of regulating the scale on the coil and interfixing with described connection tube regulating distance that coil retreats reaches and stop backward rotation after the required dosage and regulate coil, then button is pressed forward, make described button front end push down the rear end of described driving coil, location end face groove on pressure tooth on the described driving coil and the described adjusting coil closely meshes, under the spiral bar and the helicla flute combined effect outside the described adjusting coil of described pipe inner wall, described adjusting coil is rotated in the forward, described adjusting coil is by described location end face groove simultaneously, pressure tooth on the described driving coil end wing, axial ribs on the described driving tube outer wall, the axial groove of described ratchet inside pipe wall drives described ratchet pipe and rotates along positive direction, described ratchet pipe is the teeth groove by the ratchet pipe again, the clutch tooth of clutch block, the guiding rib of clutch block, tangent plane on the described screw rod drives screw rod and rotates along positive direction, described screw rod leading in described nut sleeve in the process that is rotated in the forward moves forward vertically under the threaded function and promotes piston in the described injection pipe by cutting somebody's hair on the described screw rod head, and the liquid medicine agent in the described injection pipe is penetrated through described syringe needle.

Unidirectional ratchet on the described connection tube is arranged on the leading portion of described connection tube near described spacer ring place, is provided with pad between the front end face of described brake spring and described unidirectional ratchet, and the ratchet on the described ratchet pipe is between described pad and described spacer ring.

Described adjusting coil is fixed with the graded tube that described scale is carved with on the surface outward.

Be provided with guide shaft between described driving coil and the described button, this guide shaft rear end is stretched in the axis hole of described button, front end withstands described driving coil.

Owing to having adopted technical solutions according to the invention, during the agent of patient injection liquid medicine, need not to install injection, directly the cap for brush is taken off, regulating on demand injection volume can use, and uses the utmost point convenient; And can forward and reversely repeatedly regulate rotary handle in the use procedure, in regulating the process of injection volume under the combined effect of the location end face groove of regulating coil, the pressure tooth that drives coil and button spring, user can be crossed the progress that each location end face groove comes perception to regulate by described pressure tooth, and two sides of location end face groove are the inclined-plane, make to regulate that to become segmentation adjustable; The cap for brush on the back cover of finishing using, the overall appearance of the form of a stroke or a combination of strokes not only is easy to carry but also helps the protection privacy of the individual.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is the three-dimensional exploded view of a specific embodiment of adjustable dosage syringe of the present invention.

Fig. 2 is the stereo amplification figure of another angle of ratchet pipe among Fig. 1.

Fig. 3 is the partial perspective view of another angle of Fig. 2.

Fig. 4 is the stereo amplification figure of another angle of clutch block among Fig. 1.

Fig. 5 is the stereo amplification figure of another angle of connection tube among Fig. 1.

Fig. 6 is the axonometric chart of another angle of Fig. 5.

Fig. 7 is the stereo amplification figure of another angle of nut sleeve among Fig. 1.

Fig. 8 be among Fig. 7 nut sleeve along the cross section view of axis.

Fig. 9 is the stereo amplification figure of another angle of button among Fig. 1.

Figure 10 is the stereo amplification figure of another angle of screw rod among Fig. 1.

Figure 11 is the stereo amplification figure that drives another angle of coil among Fig. 1.

Figure 12 is the stereo amplification figure of regulating another angle of coil among Fig. 1.

Figure 13 be among Fig. 1 conduit along the profile of axis.

Figure 14 is each assembling parts profile of tailing edge axis together among Fig. 1.

Figure 15 is the partial enlarged drawing of Figure 14.

Figure 16 is the schematic diagram after the adjusting coil among Figure 15 rotates a segment distance backward.

Among the figure 1, the cap for brush, 11, syringe needle, 12, the injection sleeve pipe, 121, dop, 13, the injection pipe, 22, cut somebody's hair 3, nut sleeve, 14, brake spring, 15, pad, 4, clutch block, 2, screw rod, 201, screw rod head, 5, the ratchet pipe, 6, connection tube, 61, hole clipping, 7, conduit, 16, outer tube, 161, form, 17, graded tube, 8, regulate coil, 9, drive coil, 92, the end wing, 93, press tooth, 18, guide shaft, 19, button spring, 20, button, 51, axial groove, 52, ratchet, 50, pipe shaft, 53, teeth groove, 41, clutch tooth, 42, guiding rib, 40, the hole, 60, spacer ring, 62, unidirectional ratchet, 31, lead into screw thread, 32, the directed wing, 200, axis hole, 202, tangent plane, 91, axial ribs, 94, endoporus, 81, the adjustable side, 82, the location end face groove, 83, helicla flute, 71, spiral bar, 131, piston.

The specific embodiment

See Fig. 1, described adjustable dosage syringe, comprise the cap for brush 1, syringe needle 11, built-in piston and pre-installed injection pipe 13, the injection sleeve pipe 12 with dop 121, connection tube 6, screw rod 2, nut sleeve 3, adjusting coil 8 and the button 20 of liquid medicine agent, wherein the liquid medicine agent in the injection pipe 13 are injected by the pharmaceutical factory and are sealed with piston 131 (referring to Figure 14, Figure 15 and Figure 16).

In conjunction with Fig. 2 and Fig. 3, pipe shaft 50 inwalls of the ratchet pipe among the figure have four axial axial grooves 51, and the front end of pipe shaft is provided with two ratchets 52, at pipe shaft front end edge annular inner wall several axial teeth groove 53 that evenly distribute.

See Fig. 4, be provided with in the hole 40 of the clutch block central authorities among Fig. 1 that the tangent plane 202 (only seeing one of them tangent plane among the figure) in the screw rod matches among symmetrical two guiding ribs 42 (only seeing wherein among the figure) and Figure 10, the clutch block rear portion be provided with ratchet pipe shown in Figure 3 on teeth groove 53 clutch tooth 41 that slides and match.

In conjunction with Fig. 5 and Fig. 6, connection tube among Fig. 1 is divided into leading portion and back segment along the spacer ring 60 that inwall is provided with annular with connection tube, sidewall at the connection tube leading portion has the hole clipping 61 of " L " shape for the dop 121 that blocks on Fig. 1 injection sleeve pipe, see Fig. 6, this connection tube leading portion is provided with some unidirectional ratchets 62 by spacer ring 60 places along the inwall circumference, ratchet 52 phases of the ratchet tube end among this unidirectional ratchet 62 and Fig. 2 or Fig. 3.

In conjunction with Fig. 7 and Fig. 8, nut sleeve among Fig. 1 is provided with and prevents in the axial groove that two directed wings 32 block the connection tube leading portion (indicating among the figure) that nut sleeve from rotating with respect to connection tube, leads the external screw thread coupling on the screw rod 2 in screw thread 31 and Fig. 1 on the nut sleeve central authorities inwall.

The back segment that button central authorities among Fig. 9 are provided with guide shaft 18 among axis hole 200 and Fig. 1 match (referring to the Figure 15) that slide.

See Figure 11, the pipe shaft that drives coil is provided with among four axial ribs 91 and Fig. 2 four axial grooves 51 on the ratchet pipe and slides and match, and its end wing 92 is provided with presses the location end face groove 82 of regulating on the coil among tooth 93 and Figure 12 to match; See Figure 12, the adjustable side 81 interior end faces of regulating the coil rear end are provided with the location end face groove 82 that the both sides sidewall is the inclined-plane, spiral bar 71 couplings of pipe inner wall among the helicla flute 83 on the pipe shaft of adjusting coil and Figure 13.

Return Fig. 1, and in conjunction with Figure 14 and Figure 15, during installation, after the rear end (right-hand member) that first conduit 7 left ends (front end) among Fig. 1 is pressed into connection tube 6 interfixes, the back segment of ratchet pipe 5 is stretched in the unidirectional ratchet of the ratchet Snap joint pipe leading portion that makes the ratchet pipe in the connection tube 6; After the screw rod head 201 of the screw rod 2 among Fig. 1 being passed stretch out in clutch block 4, pad 15, the brake spring 14 rear screw-in nut sleeve 3, to cut somebody's hair again and 22 snap in the screw rod head 201, then the back segment with screw rod 2 stretches in the ratchet pipe 5, and make in the bayonet socket of the directed wing 32 Snap joint pipe leading portions on the nut sleeve 3 nut sleeve is positioned at the connection tube leading portion, this moment, nut sleeve can not be rotated with respect to connection tube, and the right-hand member that the left end of the outer tube 16 among Fig. 1 (it is the part that connection tube 6 extends back that outer tube 16 can be used as) is inserted in connection tube 6 is fixed; To regulate in the coil 8 screw-in conduits 7 after graded tube 17 right-hand members and the adjustable side 81 of regulating coil 8 is fixing, to drive coil 9 inserts in the ratchet pipe 5 after coil 8 right-hand members stretch into through regulating, again guide shaft 18 left ends are inserted ratchet pipe 9 right-hand members, in the adjustable side of regulating coil, put into button spring 19, button 20 is pressed in the adjustable side of regulating coil gets final product, injection pipe 13 is put into behind the injection sleeve pipe 12 and injection sleeve pipe 12 right-hand member Snap joint pipes 6 to be made dop 121 block hole clipping 61 on the connection tube, and then syringe needle 11 is screwed into injection sleeve pipe left end, the pin of syringe needle 11 right-hand members is inserted in the injection pipe 13, at last the cap for brush 1 is inserted in injection sleeve pipe 12 outer getting final product.

In conjunction with Figure 14, Figure 15 and Figure 16, during use, the cap for brush 1 among Figure 14 is extracted, syringe needle 11 is exposed; Regulate coil 8 by adjustable side 81 opposite spins of regulating the coil outer end among Figure 15, make coil 8 state shown in Figure 16 that moves right of regulating, although the pressure tooth 93 on the end wing 92 of driving coil 9 right-hand members is pressed under the effect of button spring 19 in the location end face groove 82 of regulating coil therebetween, and make driving coil 9 be subject to the power of opposite spin, but match by the axial groove in axial ribs and the ratchet pipe because drive coil, make and drive coil and the necessary synchronous rotary of ratchet pipe, and the unidirectional ratchet in the ratchet connected tube 6 of thorn claw pipe 5 left ends is directed and can not opposite spin, so this moment, driving coil 9 can not be along counter-rotation, and the elastic force that can only overcome button spring 19 under the inclined-plane side action of the location end face groove 82 of regulating coil moves right, and in the button spring effect falls into next location end face groove, the sound that location end face groove and the interaction of pressing tooth are sent in regulating the counter-rotational process of coil can prompting user the adjusting input, even and before pressing the button, regulate coil along the positive direction rotation, even because the unidirectional ratchet in the ratchet on the ratchet pipe and the connection tube also has larger positioning resistance when being rotated in the forward, it (namely is not to pass through press push button that the adjusting coil is rotated in the forward in the operation of manual adjustments injection volume, but by the adjustable side 81 among manual rotation Figure 15 the adjusting coil is rotated in the forward) time, pass through button spring, regulate the location end face groove of coil, the pressure tooth that drives coil is delivered to the power that is rotated in the forward of ratchet pipe less than this positioning resistance, prevented that the ratchet pipe is rotated in the forward to follow when regulating injection volume and is rotated in the forward regulating coil, so this syringe can be regulated when regulating injection volume repeatedly; After regulating injection volume, with hands button shown in Figure 16 20 is pressed left, button is pushed down the right-hand member that drives the coil end wing 92 by guide shaft 18, driving coil 9 can not be moved right, at this moment, adjusting coil 8 is subject to power left, regulating coil 8 rotates along positive direction under the spiral bar effect of conduit 7, therebetween by regulating the location end face groove 82 on the coil, the pressure tooth 93 that drives on the coil drives the rotation of driving coil 9 positive directions, driving coil 9 rotates along positive direction by four axial grooves drive ratchet pipes in its four axial ribs and the ratchet pipe, the thorn claw pipe by its left end teeth groove and clutch block on clutch tooth drive the rotation of clutch block positive direction, clutch block drives the rotation of screw rod positive direction by its guiding rib, screw rod is moved to the left leading under threaded function of nut sleeve, the piston that promotes in the injection pipe of cutting somebody's hair of screw rod left end is moved to the left and the liquid medicine agent in the injection pipe is penetrated through syringe needle, finishes action of injection.

Among the present invention, before the injection sleeve pipe was packed connection tube into, nut sleeve was moved to the left to high order end under the brake spring effect, can drive therebetween that clutch block is moved to the left until clutch block separates with the ratchet pipe.

Unidirectional ratchet among the present invention on the connection tube is arranged on the leading portion of connection tube near the spacer ring place, is provided with pad between the front end face of brake spring and unidirectional ratchet, and the ratchet on the ratchet pipe is between pad and described spacer ring.

Surface graduated graded tube at quarter also can directly be engraved in scale and regulate on the coil among the present invention.

In the present embodiment, the part that interfixes can connect also and can fix with the bonding mode of glue with friction tight mode, and the outer tube in the present embodiment can be thought the part of connection tube, separately is in order to simplify plastic injection mould with it why.

Claims

1. An adjustable metering syringe, comprising a pen cap, a needle, a built-in piston and an injection tube pre-loaded with liquid medicine, an injection sleeve, a connecting tube, a screw, a nut sleeve, an adjustment coil and a button, wherein the liquid medicine in the injection tube It is injected by the pharmaceutical factory and sealed with a piston; it is characterized in that the connecting pipe is provided with an annular partition ring along the inner wall to divide the connecting pipe into a front section and a rear section, and the through hole in the center of the partition ring is slidingly matched with the outer diameter of the ratchet tube. The ratchet tube is provided with a pawl to match the one-way ratchet provided on the inner wall of the connecting tube so that the ratchet tube can rotate in the positive direction relative to the connecting tube but cannot rotate in the reverse direction. The pawl tube and the connecting tube are limited in the axial direction so that the pawl on the pawl tube is effectively engaged with the one-way ratchet in the connecting tube, and the front end of the pawl tube is uniform along the annular inner wall. A number of axial tooth grooves are distributed; one side of the screw after cutting off part of the thread is parallel to the axis of the screw. The screw head at the front end of the screw is engaged with a push head that can rotate relative to the screw head, and the inner wall of the hole in the center of the clutch block is provided with guide ribs to match the tangent surface of the screw so that the gap between the clutch block and the screw is fixed. Slidingly fit in the axial direction and cannot be rotated relative to each other. The rear part of the clutch block is provided with a clutch tooth that is slidingly matched with the tooth groove on the pawl tube. The nut sleeve is located at the front section of the connecting pipe and the nut sleeve is A directional wing is provided to prevent the nut sleeve from rotating relative to the connecting pipe, and a clutch spring is provided between the pawl tube and the nut sleeve or between the pawl tube and the clutch block; The rear end of the connecting pipe is fixedly connected to the conduit with spiral ribs on the inner wall, the spiral groove on the surface of the adjusting coil is coupled with the spiral ribs in the inner wall of the conduit, and the annular end surface at the rear of the adjusting coil is provided with evenly distributed The two sides of the positioning end grooves are slopes; the axial ribs on the outer wall of the driving coil extending along the rear end of the adjusting coil and the axial grooves on the inner wall of the ratchet tube Sliding matching, the pressing teeth on the front side of the end wing at the rear end of the ratchet tube match the positioning end face groove on the adjusting coil; the tail end of the adjusting coil is equipped with a rotatable a button, and a button spring is arranged between the adjusting coil and the button;

When in use, the adjusting coil is rotated in the opposite direction, and the adjusting coil is retreated under the interaction between the spiral groove of the adjusting coil and the helical rib of the catheter, and the driving force of the button spring is activated during this process. The pressure tooth on the end wing of the coil is pressed in the positioning end surface groove of the adjusting coil and the reverse rotation force transmitted to the driving coil is transmitted to the drive coil through the axial rib outside the driving coil and the axial groove in the pawl tube The ratchet tube, under the action of the ratchet of the ratchet tube and the one-way ratchet of the connecting tube, neither the ratchet tube nor the driving coil can rotate in the opposite direction, so that the driving coil can only be positioned at the position Under the interaction between the end face groove and the pressing tooth, the elastic force of the button spring is overcome and the pressing tooth is moved backward in the axial direction so that the pressing tooth slides into the next positioning end face groove, according to the scale on the adjusting coil and the interaction with the connecting pipe The indicator mark on the fixed outer tube judges that the adjustment coil has retreated to the required dosage, and then stops the reverse rotation of the adjustment coil, and then presses the button forward so that the front end of the button presses against the drive coil. At the rear end, the pressing teeth on the driving coil are tightly engaged with the positioning end surface grooves on the adjusting coil, and under the joint action of the spiral rib on the inner wall of the catheter and the spiral groove outside the adjusting coil, the The adjusting coil rotates in the forward direction, while the adjusting coil passes through the groove on the positioning end face, the pressing teeth on the end wings of the driving coil, the axial ribs on the outer wall of the driving tube, and the inner wall of the pawl tube. The axial groove drives the pawl tube to rotate in the positive direction, and the pawl tube drives the screw along the positive direction through the tooth groove of the pawl tube, the clutch teeth of the clutch block, the guide ribs of the clutch block, and the cut surface on the screw rod. direction, the screw moves forward in the axial direction under the action of the guide thread in the nut sleeve during forward rotation, and pushes the piston in the injection tube through the push head on the screw head, so that The liquid medicine in the injection tube is ejected through the needle.

2. The adjustable metering syringe according to claim 1, characterized in that the one-way ratchet on the connecting pipe is arranged at the front section of the connecting pipe close to the spacer ring, and the clutch spring is connected with the one-way ratchet. A spacer is provided between the front end faces of the ratchet teeth, and the pawl on the pawl tube is located between the spacer and the spacer ring.

3. The adjustable metering syringe according to claim 1 or 2, characterized in that a scale tube with the scale engraved on the surface is fixed outside the adjustment coil.

4. The adjustable metering syringe according to claim 1 or 2, characterized in that a guide shaft is provided between the driving coil and the button, the rear end of the guide shaft extends into the shaft hole of the button, and the front end against the drive coil.