End point control method of syringe and syringe thereof

Abstract

The invention relates to an endpoint control method of a syringe which is easy to use and has an endpoint control prompting function, and a syringe thereof. The syringe comprises an injection sleeve, a screw, a fixed tube, a spiral tube, a pressing head and a one-way stop mechanism. A ball track tube and a ball driving tube sleeved outside the ball track tube are arranged in the fixed tube, and a track groove for placing balls is arranged on the outer surface of the ball track tube. An internal thread groove is arranged on the inner tube wall of the ball driving tube, and the ball is located between the track groove and the internal thread groove. When adjusting the dosage during use, the spiral tube drives the ball driving tube to rotate forwardly. When injecting, the spiral tube drives the ball driving tube and the ball track tube to rotate reversely at the same time. In the process of continuously adjusting the injection dosage and performing the injection, the internal thread groove in the ball driving tube is used to move the ball from the starting point to the end point, and then the spiral tube is locked so that the dosage cannot be further adjusted, thereby achieving the purpose of prompting the end point and preventing the occurrence of empty injection of the syringe.

Description

Technical Field

[0001] The invention relates to an endpoint control method of a syringe and a syringe thereof. Background Art

[0002] A Chinese patent application with publication number CN201324413Y published on October 14, 2009 discloses a quantitatively adjustable pen-type injector, which includes a fixed tube, a push head, a sleeve, a clutch sleeve, a rotating gear, a screw, a transmission tube, a stop ring, a fixed ring, a spiral tube, a transfer gear cylinder, a transmission gear cylinder, a sleeve, etc. The position of the spiral tube relative to the sleeve is adjusted by rotating the tail end of the spiral tube to adjust the pre-compression dose during injection. In the process of pressing the spiral tube inward, the spiral tube drives the transfer gear cylinder, the transmission gear cylinder, the transmission tube, the rotating gear and the screw. The screw is rotated so that the screw is pushed forward relative to the sleeve and the injection of the injection placed in the fixed tube is quantitatively injected into the human body; there is a stop mechanism inside, so that even if the spiral tube is adjusted backward during the next injection, the push head will not retreat; in fact, a driving mechanism and a clutch mechanism for driving the transmission tube to rotate are set in its shell, wherein the clutch mechanism controls the clutch mechanism through the fixed tube threadedly connected to the sleeve and its external spring; this quantitative adjustable pen-type syringe actually converts rotational motion into linear motion through a threaded mechanism, so only the thread If the pitch of the screw in the mechanism is small and the outer diameter of the spiral tube is large enough, the tiny linear motion distance can be converted into a larger circular motion distance, which is convenient for improving the adjustment accuracy. It is particularly suitable for diabetic patients to inject a small dose of insulin each time. However, when the injection is almost used up, the injector needs to carefully observe whether the injection liquid in the injection tube is used up, otherwise there will be a blank shot phenomenon (that is, although the manual injection action is completed, because the movement of the syringe is small and it is generally difficult for the operator to observe the movement process of the syringe during the injection process, there is actually a situation where the manual operation is completed but the syringe may not perform the injection movement. The reason is that after the injection liquid is used up, the spiral tube can continue to rotate and move backward, but the spiral tube will not move forward when the injection is pressed-that is, the screw will not rotate and there is no injection action). After several blank shots, the backward distance of the syringe spiral tube accumulates to a certain extent to attract the injector's attention and then the injection is replaced, resulting in the patient's failure to inject the medicine in time and causing the risk of worsening of the patient's condition; therefore, this syringe without endpoint control prompt function still has shortcomings.

[0003] Similar technologies in the same technical field also include Chinese patent announcements with announcement numbers: CN 101829381 B (announcement date: April 29, 2015), CN 106215284 A (announcement date: December 14, 2016), and CN 103041476 B (announcement date: December 12, 2017). The above patent technologies also have the disadvantage of not having an endpoint control prompt function. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing syringes have no endpoint control prompt function, and to provide an endpoint control method and a syringe which is easy to use and has an endpoint control prompt function.

[0005] The object of the present invention is achieved as follows: A method for controlling the endpoint of a syringe, comprising an injection sleeve, a screw, a fixed tube, a spiral tube, a pressing head and a one-way stop mechanism, characterized in that it comprises the following steps:

[0006] Step 1: a ball track tube and a ball driving tube sleeved outside the ball track tube are arranged in the fixed tube, wherein a track groove for placing balls is arranged on the outer surface of the ball track tube, an internal thread groove is arranged on the inner tube wall of the ball driving tube, the ball is located between the track groove and the internal thread groove, the ball is located at the starting point of the track groove, and the ball track tube and the screw are circumferentially positioned;

[0007] Step 2: When adjusting the injection dose, the spiral tube is rotated forwardly to cause the spiral tube to rotate and retreat axially, thereby driving the ball driving tube to rotate forward synchronously and drive the ball to move toward the end point of the track groove, and the displacement of the ball along the track groove is proportional to the adjusted injection dose;

[0008] Step 3: during injection, the pressing head is pressed down to make the spiral tube move forward in the axial direction and rotate in the reverse direction. During the reverse rotation of the spiral tube and the movement of the screw, the ball driving tube and the ball track tube are driven to rotate in the reverse direction synchronously so that the ball in the track groove remains in the track groove unchanged;

[0009] Step 4, repeating steps 2 and 3 repeatedly until the ball is driven by the ball driving tube to the end of the track groove and the ball is limited by the end of the track groove, so that the spiral tube cannot continue to rotate forward, that is, the injection dose can no longer be adjusted to increase the injection dose so that the injector is informed that the injection is about to be used up (this is the last injection dose, and it may be an insufficient injection dose, and the missing injection dose should be supplemented after replacing the new injection tube).

[0010] The track groove is an axial groove.

[0011] The track groove is a left-handed external thread groove, and the internal thread groove of the ball driving tube is a right-handed internal thread groove.

[0012] The total displacement of the ball from the starting point to the end point of the track groove corresponds to the total amount of injection in the injection sleeve.

[0013] A syringe, comprising an injection sleeve, a screw, a fixed tube, a spiral tube and a pressing head, characterized in that:

[0014] A ball track tube and a ball driving tube sleeved outside the ball track tube are arranged at the rear section inside the fixed tube, wherein a track groove for placing the ball is arranged on the outer surface of the ball track tube, an internal thread groove is arranged on the inner tube wall of the ball driving tube, and the ball is located at the intersection between the track groove and the internal thread groove;

[0015] The ball track tube covers the connecting coil, and the inner coil covered by the connecting coil is circumferentially positioned between the connecting coil;

[0016] The spiral tube covers the ball driving tube, and the fixed tube, the ball driving tube, the ball track tube and the connecting spiral tube are axially positioned;

[0017] The ball drive tube is circumferentially positioned with the spiral tube;

[0018] The outer cylindrical surface of the spiral tube is provided with an adjusting external thread which is threadably coupled with the adjusting internal thread arranged in the fixed tube, and the elastic friction teeth arranged on the fixed tube match the tooth grooves in the friction toothed disk on the track driving tube, so that there is sufficient circumferential resistance between the track driving tube and the fixed tube;

[0019] The rear section of the spiral tube extends out through the rear end of the fixed tube and a graduated toothed disk is provided on the end surface of the spiral tube, the teeth on the graduated toothed disk extend axially, the tail of the inner spiral tube extending out of the spiral tube is provided with pressing teeth matching the tooth grooves on the graduated toothed disk, the central column extending from the inner end of the pressing head extends into the inner spiral tube, the card platform on the inner wall of the inner spiral tube is inserted into the first annular groove of the central column to axially position the inner spiral tube and the pressing head, a pressing ring is placed between the inner spiral tube and the pressing head, and a first spring is provided between the pressing ring and the inner spiral tube;

[0020] The front section of the fixed tube is provided with a connecting slider and a clutch tube, the connecting slider is circumferentially positioned between the fixed tube, the clutch tube and the connecting slider are axially positioned, and the clutch tube is respectively provided with a first clutch rib, a synchronous rib and a second clutch groove, the first clutch rib matches the first clutch groove in the connecting spiral tube, the synchronous rib matches the synchronous groove in the ball track tube so that the ball track tube and the clutch tube are circumferentially positioned, and the inner wall of the stop wheel outside the clutch tube is provided with a second clutch rib that matches the second clutch groove, and the rear end surface of the stop wheel is provided with a one-way tooth extending axially and matching the tooth groove on the one-way toothed disk fixedly connected to the fixed tube, and a third spring is provided between the stop wheel and the connecting slider so that the one-way tooth presses the one-way tooth against the one-way toothed disk; the inner wall of the clutch tube is provided with a synchronous boss extending into the driving axial groove of the screw; the external thread on the screw matches the driving internal thread arranged in the fixed tube;

[0021] The usage process is as follows:

[0022] The injection sleeve with the injection tube is installed into the front end of the fixed tube, and the injection sleeve pushes the connecting slider to slide backward and drives the clutch tube to slide backward, so that the first clutch rib of the clutch tube is inserted into the first clutch groove of the connecting spiral tube, and the second clutch rib in the anti-retraction wheel falls into the second clutch groove of the clutch tube, so that the clutch tube, the connecting spiral tube and the anti-retraction wheel are circumferentially positioned and can rotate synchronously. Under the interaction between the one-way teeth of the anti-retraction wheel and the one-way toothed disc, the clutch tube is positively restrained, that is, it can rotate in the reverse direction but cannot rotate in the forward direction;

[0023] The spiral tube is rotated forwardly by a certain angle according to the required injection volume. The spiral tube retreats axially by a corresponding distance (rotates and retreats at the same time as in the prior art solution) under the interaction between the adjusting outer thread and the adjusting inner thread. During the forward rotation of the spiral tube, the ball driving tube is driven to rotate forward synchronously, thereby driving the ball to move a corresponding displacement amount toward the end point of the track groove. During the forward rotation of the spiral tube, the connecting spiral tube and the clutch tube are controlled by the stop wheel together. The inner spiral tube reciprocates axially under the joint action of the first spring, the pressure tooth and the indexing tooth disk, so that the spiral tube and the inner spiral tube are forced to rotate relative to each other. Each time the pressure tooth of the inner spiral tube passes over a tooth on the indexing tooth disk, it is a small unit of the injection dosage adjusted by the spiral tube.

[0024] When the pressing head is pressed down, the spiral tube is subjected to a forward thrust and, under the interaction between the adjusting outer thread and the adjusting inner thread, the spiral tube is subjected to a torque of reverse rotation. The spiral tube transmits the torque to the outside of the ball driving tube and also transmits the torque to the inner rotating tube, the connecting spiral tube, and the clutch tube through the indexing gear plate and the pressing teeth. The clutch tube then transmits the torque to the ball track tube, the screw rod, and the stop wheel respectively, so that the spiral tube, the ball driving tube, the ball track tube, the inner rotating tube, the connecting spiral tube, the clutch tube, the stop wheel, and the screw rod synchronously rotate in reverse (at this time, the reverse rotating stop wheel is not restrained), and the outer thread on the screw rod interacts with the driving inner thread to move the screw rod forward, thereby pushing the injection liquid in the injection tube outward;

[0025] Repeated use until the spiral tube cannot be rotated forward, indicating that the ball has reached the end of the track groove, and the injection liquid in the injection tube is about to run out. The scale of the spiral tube rotation is the dosage of the last injection. After the last injection, the injection tube needs to be replaced;

[0026] When replacing the injection tube, remove the injection sleeve, and the clutch tube moves forward under the action of the third spring to separate the first clutch rib from the first clutch groove, and the second clutch rib from the second clutch groove. The screw rod extending out of the fixed tube is pushed back by hand, and the screw rod rotates forward under the action of the driving internal thread and resets toward the fixed tube. During the screw rod resetting process, the screw rod drives the clutch tube to rotate forward, and the clutch tube drives the ball track tube to rotate forward to reset the ball to the starting point (in this process, the ball drive tube is ensured to remain stationary because the friction between the friction toothed disc and the friction teeth is too large).

[0027] The track groove is an axial groove.

[0028] The track groove is a left-handed external thread groove, and the internal thread groove of the ball driving tube is a right-handed internal thread groove.

[0029] The total displacement of the ball from the starting point to the end point of the track groove corresponds to the total amount of injection in the injection sleeve.

[0030] The driving internal thread is arranged in a nut, and the nut is arranged in the connecting slider and is circumferentially positioned with the connecting slider.

[0031] A second annular groove is provided on the outer cylindrical surface of the nut, and more than three second buckle feet on the nut buckle located in the connecting slider are buckled into the second annular groove, so that the nut and the nut buckle are axially positioned, and a reset clutch rib is provided on the outer cylindrical surface of the nut buckle, which matches the reset clutch groove on the connecting slider to form a reset clutch, and a fourth spring is provided between the nut and the connecting slider to enable the reset clutch rib to slide into the reset clutch groove; a synchronous clamping table is provided on the nut buckle that extends into the driving axial groove of the screw; when the injection sleeve is installed into the fixed tube, the screw The nut is pushed backward to separate the reset clutch rib on the nut buckle from the reset clutch groove, and the nut buckle can rotate coaxially relative to the nut; after removing the injection sleeve, the nut, under the action of the fourth spring, inserts the reset clutch rib into the reset clutch groove, so that the screw cannot rotate, and when the ball needs to be reset to the starting point, the screw is pushed inward to drive the nut to synchronously move axially backward for a certain displacement until the reset clutch rib is separated from the reset clutch groove, and the screw starts to rotate forwardly and reset under the action of the driving internal thread.

[0032] The pressure ring is buckled with the end of the spiral tube.

[0033] The friction toothed disc is arranged at the root of the track driving tube and extends axially, and the friction teeth on the connecting buckle that covers the root of the track driving tube press the tooth grooves of the friction toothed disc, and the three first buckle feet of the connecting buckle pass through the connecting sleeve and buckle together with the buckle ring, and a second spring is arranged between the buckle ring and the connecting sleeve, and the second spring and the friction teeth on the connecting buckle constitute the elastic friction teeth; the connecting sleeve is fixedly connected to the fixed tube, and the one-way toothed disc is arranged in the connecting sleeve.

[0034] Due to the adoption of the technical solution of the present invention, after the ball moves to the end point of the track groove, the spiral tube is locked in the positive circumferential direction and cannot continue to rotate, which clearly reminds the user that the injection dose has reached the end point, the injection liquid in the used injection tube is about to be used up, this is the last injection amount, and it may be an injection with insufficient injection dose. Before the injection, the injection dose of this last injection should be read and the corresponding injection dose should be supplemented after replacing the new injection tube to ensure that the recipient receives normal treatment; that is, the technical solution can prevent the phenomenon of empty injection of the syringe. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] Figure 1 It is a three-dimensional exploded view of a specific embodiment of the endpoint control method of the syringe and the syringe thereof of the present invention.

[0037] Figure 2 yes Figure 1 A three-dimensional enlarged view of the middle button 11 from another angle.

[0038] Figure 3 yes Figure 1 A three-dimensional enlarged view of another angle after the medium pressure ring 12 is cut off in half.

[0039] Figure 4 yes Figure 1 A three-dimensional enlarged view of the inner spiral tube 2 from another angle.

[0040] Figure 5 yes Figure 1 A three-dimensional enlarged view of the middle knob ring 3 from another angle.

[0041] Figure 6 yes Figure 1 A three-dimensional enlarged view of the middle fixing ring 43 from another angle.

[0042] Figure 7 yes Figure 1 A three-dimensional enlarged view from another angle after the middle spiral tube 31 is cut off in half.

[0043] Figure 8 yes Figure 1 A three-dimensional enlarged view from another angle after the middle connecting coil 52 is cut off in half.

[0044] Fig. 9 yes Figure 1 A three-dimensional enlarged view of the middle connecting buckle 53 from another angle.

[0045] Fig.10 yes Figure 1 A three-dimensional enlarged view of the middle buckle 58 from another angle.

[0046] Fig.11 yes Figure 1 A three-dimensional enlarged view from another angle after the middle ball driving tube 54 is cut off in half.

[0047] Fig.12 yes Figure 1 A three-dimensional enlarged view of the middle ball track tube 55 after half of it is cut off.

[0048] Fig.13 yes Figure 1 A three-dimensional enlarged view of the middle connecting sleeve 57 from another angle.

[0049] Fig.14 yes Figure 1 A three-dimensional enlarged view of the middle clutch tube 62 from another angle.

[0050] Fig.15 yes Fig.13 A three-dimensional image from another angle.

[0051] Fig.16 yes Figure 1 A three-dimensional enlarged view of the stop and retract wheel 59 from another angle.

[0052] Fig.17 yes Figure 1 A three-dimensional enlarged view of the middle nut 65 from another angle.

[0053] Fig.18 yes Figure 1 A three-dimensional enlarged view of the middle nut buckle 63 from another angle.

[0054] Fig.19 yes Fig.17 A three-dimensional image from another angle after being cut in half.

[0055] Fig. 20 yes Figure 1 A three-dimensional enlarged view of the middle connecting seat 64 from another angle.

[0056] Fig.21 yes Fig. 20 The connecting base is shown as a three-dimensional view from another angle after being partially cut away.

[0057] Fig. 22 yes Figure 1 A three-dimensional enlarged view of the connecting slider 67 from another angle.

[0058] Fig.23 yes Figure 1 A three-dimensional enlarged view of the middle screw 69.

[0059] Fig.24 yes Figure 1 A three-dimensional diagram of the parts after they are assembled together.

[0060] Fig.25 yes Figure 1 A three-dimensional enlarged view of the middle ball track tube 55.

[0061] Fig.26 yes Fig.24 The enlarged cross-sectional view after the pen cap, injection sleeve and injection tube are removed (the cross-section lines are not drawn in the figure). The status of each part in the figure is the status when the injection sleeve is installed.

[0062] Fig. 27 yes Fig.24 An enlarged cross-sectional view of the injection sleeve and the injection tube after the ball moves to the end of the track groove and is removed (the cross-sectional line is not drawn in the figure, and the screw is not cross-sectionally cut).

[0063] Fig.28 yes Figure 1 An enlarged cross-sectional view of the middle parts after they are assembled together.

[0064] Fig.29 yes Figure 1 An enlarged cross-sectional view of another part of the vehicle after it is assembled together.

[0065] Fig.30 yes Fig.28 Parts in Fig.29 Schematic diagram of the parts after they are assembled together.

[0066] In the figure, 11, the button head, 12, the pressure ring, 01, the first spring, 2, the inner rotating tube, 3, the knob ring, 43, the fixing ring, 312, the adjusting outer thread, 31, the spiral tube, 42, the magnifying lens, 41, the fixing tube, 51, the cover, 52, the connecting rotating tube, 53, the connecting buckle, 54, the ball driving tube, 55, the ball track tube, 551, the left-handed outer thread groove, 05, the ball, 56, the bearing, 57, the connecting sleeve, 02, the second spring, 58, the buckle, 59, the backstop wheel, 03, the third spring , 61, connecting ring, 62, clutch tube, 63, nut buckle, 64, connecting seat, 04, fourth spring, 65, nut, 66, push ring, 67, connecting slider, 68, head cover, 69, screw, 71, 72, push head, 06, injection tube, 07, injection sleeve, 08, pen cap; 111, center column, 112, first annular groove, 121, buckle rib, 122, center hole, 21, pressure tooth, 22, first axial rib, 301, indexing tooth plate, 302, buckle table, 431, adjust the inner screw groove, 311, second axial rib, 521, first axial groove, 522, first clutch groove, 531, friction tooth, 532, first buckle foot, 581, annular rib, 541, right-hand internal thread groove, 542, friction tooth plate, 543, second axial groove, 552, synchronous groove, 571, one-way tooth plate, 621, small diameter ring, 6211, first clutch rib, 622, middle diameter ring, 6221, synchronous rib, 623, large diameter ring, 6231, convex rib, 6232, second clutch groove, 624, Limiting rib, 625, synchronous boss, 572, notch, 573, buckle foot, 591, one-way tooth, 592, second clutch rib, 651, second annular groove, 652, positioning boss, 631, reset clutch rib, 632, second buckle foot, 633, synchronous clamping table, 654, driving internal thread, 641, reset clutch groove, 671, positioning groove, 672, connecting column, 673, upper clamping rib, 674, lower clamping rib, 691, annular push groove, 692, driving axial groove, 553, end point. DETAILED DESCRIPTION

[0067] See Figure 1 , is a three-dimensional exploded view of a specific embodiment of the endpoint control method of the syringe and the syringe of the present invention. Figure 1As can be seen in the figure, the syringe includes a push head 11, a pressure ring 12, a first spring 01, an inner spiral tube 2, a knob ring 3, a fixing ring 43, a spiral tube 31, a fixing tube 41, a cover 51, a connecting spiral tube 52, a connecting buckle 53, a ball driving tube 54, a ball track tube 55, a ball 05, a bearing 56, a connecting sleeve 57, a second spring 02, a buckle 58, a stop wheel 59, a third spring 03, a connecting ring 61, a clutch tube 62, a nut buckle 63, a connecting seat 64, a fourth spring 04, a nut 65, a push ring 66, a connecting slider 67, a head cover 68, a screw 69, push heads 71 ​​and 72, an injection sleeve 07, etc.

[0068] Figure 1 The assembly can be divided into the following steps:

[0069] The first step, see Fig.28 (No section line or fourth spring is drawn in the figure), first put the nut 65 into the connecting slider 67 and then buckle the head cover 68 so that the nut 65 is installed in the connecting slider ( Fig.17 The positioning boss 652 on the middle nut is located Fig. 22 The nut and the connecting slider are positioned in the positioning groove 671 of the connecting slider as shown in the figure, and then placed into the connecting seat 64 together with the fourth spring 04 so that the fourth spring is located between the nut 65 and the connecting seat 64, and the push ring 66 is screwed into the connecting seat so that the push ring and the connecting seat are connected to each other. Fig. 22 The three connecting columns 672 on the middle connecting slider extend out of the outer end of the connecting seat (the connecting slider and the connecting seat are circumferentially positioned), and the second buckle foot on the nut buckle 63 passes through the connecting seat from the other direction and buckles the second annular groove of the nut 65 (i.e. Fig.18 The second buckle foot 632 on the nut buckle in the middle extends into Fig.17 The nut is inserted into the second annular groove 651 of the nut so that the nut and the nut buckle are axially positioned and can rotate relative to each other. After the nut buckle is buckled, the fourth spring Fig.18 The reset clutch rib 631 on the nut buckle slides into Fig. 20 The reset clutch groove 641 of the connecting seat is circumferentially positioned to connect the connecting column of the connecting slider with the connecting ring 61 and to connect the clutch tube 62 as shown in FIG. Fig.14 The limiting rib 624 shown is limited between the connecting column and the connecting ring to axially locate the connecting slider and the connecting seat. Figure 1 The two push heads 71 ​​and 72 in the screw 69 are engaged with the annular push groove 691 (see Fig.23 ) and then screw the screw into the nut until the screw contacts the nut buckle and rotates the nut buckle to Fig.18 The synchronous clamping table 633 in the nut buckle shown falls into Fig.23The screw is inserted into the driving axial groove 692 of the screw, so that the nut buckle and the screw are positioned circumferentially. At this time, the push head must be pushed toward the screw to overcome the elastic force of the fourth spring until the reset clutch rib on the nut buckle is separated from the reset clutch groove on the connecting seat. Then the screw can be automatically screwed in until it presses against the clutch tube 62, and then the clutch tube is manually rotated to make it Fig.14 The synchronous boss 625 of the middle clutch tube falls into Fig.23 The middle screw is driven in the axial groove 692 to position the clutch tube and the screw circumferentially. The screw is pushed with force. After the reset clutch rib is separated from the reset clutch groove, the screw drives the nut buckle and the clutch tube to rotate during the screwing process until the two push heads are limited by the head cover 68. The fourth spring of the back hand pulls the reset clutch rib on the nut buckle into the reset clutch groove of the connecting seat again. Fig.28 As shown, the screw is at the starting position at this time;

[0070] Step 2, see Fig.29 (No section line is drawn in the figure, and no second spring is drawn in the figure), put the ball (not drawn in the figure) into the left-handed external thread groove (i.e., the ball track groove) of the ball track tube, and then install the ball track tube 55 into the ball drive tube 54, put the bearing 56 between the ball track tube and the ball drive tube, and then buckle it with the connecting sleeve 57 (actually with Fig.15 The three buckle feet 573 extending from the connecting sleeve as shown buckle the edge of the root of the ball drive tube), put the second spring 02 and the buckle ring 58 into the connecting sleeve 57, and then put the connecting buckle 53 on the root of the ball drive tube and make it Fig. 9 The three first buckle legs 532 shown extend into the connecting sleeve 57 and buckle the buckle ring 58, so that the two ends of the second spring respectively support the connecting sleeve and the buckle ring. Fig. 9 The friction teeth 531 of the middle connecting buckle are pressed by the second spring. Fig.11 The friction toothed disc 542 at the root of the ball driving tube, the friction teeth on the second spring, the buckle ring and the connecting buckle constitute the elastic friction teeth of the present invention, and then the connecting spiral tube 52 is inserted into the ball track tube 55 and the cover 51 is pressed into the end of the ball driving tube 54 to obtain Fig.29 The components shown;

[0071] The third step is to Fig.29 The connecting sleeve 57 is placed in Figure 1 After the backstop wheel 59 and the third spring are Fig.28 Component loading in Fig.29 The two ends of the third spring are respectively supported against the stop wheel 59 and the connecting ring 61 to obtain Fig.30 The components shown, at this time Fig.14 Insert the synchronous rib 6221 on the middle diameter of the clutch tube Fig.12 The ball track tube and the clutch tube are positioned in the circumferential direction in the synchronous groove 552 in the inner wall of the ball track tube. Fig.30(No section line is drawn in the figure and no third spring is drawn in the figure);

[0072] The fourth step is to Fig.30 The components shown are installed Figure 1 The connecting seat and the connecting sleeve are buckled together with the fixing pipe to fix each other, and then Figure 1 The spiral tube 31 is sleeved outside the ball drive tube 54 ( Figure 7 The second axial rib 311 on the inner wall of the middle spiral tube is Fig.11 The second axial groove 543 on the outer wall of the middle ball driving tube matches, so that the spiral tube and the ball driving tube are circumferentially positioned). Because the reset clutch rib on the nut buckle is engaged with the reset clutch groove on the connecting seat, the nut buckle, the screw, the clutch tube and the ball track tube are all circumferentially locked and cannot rotate. Therefore, the reverse rotation of the spiral tube drives the ball driving tube to push the ball to the starting point, keeping the spiral tube stationary and Figure 1 The fixing ring 43 in the spiral tube is screwed into the spiral tube for a distance and then the fixing ring and the fixing tube are fixed together (see Figure 6 , the adjusting inner thread 431 of the fixing ring and Figure 1 The adjusting outer thread on the spiral tube matches the inner one); return Figure 1 , press the knob ring 3 into the end of the spiral tube 31 to fix the two together, and then insert the inner spiral tube 2 through the through holes in the knob ring and the center of the cover and insert it into the connecting spiral tube 52, so that Figure 4 The first axial rib 22 on the inner rotating tube is Figure 8 The first axial groove in the connecting coil is matched, and then Figure 1 The first spring 01 is placed between the inner rotating tube 2 and the pressure ring 12 to press the pressure ring 12 toward the knob ring 3. Figure 3 The buckle rib 121 on the pressure ring shown buckles Figure 5 The buckle platform 302 on the middle knob ring is caused by the elastic force of the first spring. Figure 4 The pressing teeth 21 of the inner rotating tube press Figure 5 The tooth grooves of the intermediate indexing toothed disc 301 are Figure 2 The central column 111 of the middle pressing head is inserted into the inner rotating tube to connect the pressing head and the inner rotating tube to each other. Figure 1 Just install the magnifying lens on the fixed tube.

[0073] In this embodiment, the track groove on the outer surface of the ball track tube is a left-handed external thread groove 551 (see Fig.25 ), the internal thread groove on the inner tube wall of the ball drive tube is a right-hand internal thread groove 541 (see Fig.11 ).

[0074] The method of use is as follows:

[0075] The first step is to install the injection sleeve. After the injection sleeve with the injection tube is screwed into the connecting seat, the injection sleeve pushes the corresponding parts to Fig.26 In the state shown, the nut 65 pushes the nut buckle 63 to move inward so that the reset clutch rib in the nut buckle 63 is separated from the reset clutch groove of the connecting seat, and the first clutch rib of the clutch tube 62 (see Fig.14 The first clutch rib 6211 in the connecting coil 52 is inserted into the first clutch groove (see Figure 8 The first clutch groove 522) and the second clutch rib (see Fig.16 The second clutch rib 592) falls into the second clutch groove (see Fig.14 The clutch tube 62, the connecting coil 52 and the stop wheel 59 are positioned circumferentially and can rotate synchronously. Under the interaction between the one-way teeth of the stop wheel 59 and the one-way toothed disc, the clutch tube is positively ( Fig.26 When viewing the page from right to left, the clockwise direction is the positive direction and the counterclockwise direction is the negative direction) control, that is, it can rotate in the reverse direction but not in the forward direction;

[0076] The second step is to adjust the injection dose. Fig.26 , the knob ring 3 is turned forward, and the spiral tube 31 moves axially to the right (equivalent to backward) under the action of the adjusting internal thread of the fixed ring 43. During the forward rotation of the spiral tube 31, because the clutch tube 62 is positively controlled, and the clutch tube 62 and the connecting spiral tube 52 are in a circumferential positioning state at this time, the inner spiral tube 2 circumferentially positioned with the connecting spiral tube is also positively controlled. Under the action of the first spring, the pressing teeth of the inner spiral tube slide through a number of tooth grooves on the indexing toothed disk on the knob ring (each sliding of the pressing teeth through a tooth groove represents the adjustment of a minimum unit of adjustment). The knob ring is stopped after observing the appropriate adjustment amount through the magnifying lens. During the rotation of the knob ring, the inner rotary tube makes a reciprocating motion along the axial direction. The reciprocating amplitude is related to the axial distance of the engagement between the pressing tooth and the indexing tooth disc. If the rotary ring is rotated quickly, the pressing tooth generates a sound between the tooth groove of the indexing tooth disc under the action of the first spring. At the same time, during the above-mentioned process of adjusting the injection dose, the spiral tube 31 also drives the ball driving tube 54 to rotate in the positive direction. The ball driving tube drives the ball in the ball track groove to move the corresponding displacement amount toward the end point.

[0077] The third step is injection. Fig.26 , press the button 11 to the left (equivalent to forward), the spiral tube is subjected to the forward thrust and rotates in the opposite direction under the action of the adjusting internal thread. During the reverse rotation of the spiral tube, on the one hand, it drives the internal rotating tube 2 to rotate in the opposite direction synchronously - the clutch tube rotates in the opposite direction synchronously - the ball track tube, the stop wheel and the screw also rotate in the opposite direction synchronously. When the screw rotates in the opposite direction synchronously, the nut buckle is also driven to rotate in the opposite direction synchronously and the screw is in the driving internal thread of the nut (see Fig.19The inner driving thread 654 of the middle nut moves forward axially to push out the injection liquid in the injection tube to complete the injection action. On the other hand, the spiral tube drives the ball driving tube to rotate synchronously in the opposite direction. That is, during the reverse rotation of the spiral tube, the ball track tube and the ball driving tube rotate synchronously in the opposite direction, so the ball remains in the track groove unchanged during the injection process.

[0078] The fourth step is to reset the ball. Repeat the second and third steps until the ball moves to the end of the track groove and the knob ring can no longer be turned forward, indicating that this injection will be the last injection of the corresponding injection tube. At this time, the last injectable dose should be read (this dose is generally less than the normal injection dose, so the missing injection dose should be made up after the new injection tube is replaced) so that the missing dose can be made up after the injection tube is replaced. After the last injection, the injection sleeve and the injection tube are removed. At this time, the nut buckle and the clutch tube are reset to the position under the action of the fourth spring and the third spring. Fig. 27 In the state shown, the reset clutch rib on the nut buckle is stuck in the reset clutch groove of the connecting seat, the first clutch rib of the clutch tube is separated from the first clutch groove of the inner rotating tube, and the second clutch groove of the clutch tube is separated from the second clutch rib of the stop wheel. Therefore, at this time: the screw cannot rotate forward or reverse; Fig. 27 When the push heads 71 ​​and 72 are pressed to the right, because the screw cannot rotate temporarily, the screw can only drive the nut and the nut buckle to move to the right under the interaction between the screw and the driving internal thread until the reset clutch rib on the nut buckle is separated from the reset clutch groove on the connecting seat, and the screw starts to rotate forward under the action of the driving internal thread of the nut, thereby driving the clutch tube to rotate forward - the ball track tube rotates forward, and the track groove in the ball track tube drives the ball to reset to the starting position (during this period, the ball driving tube is positioned by the friction teeth and is not affected by the friction force of the ball track tube).

[0079] In this embodiment, the pressing head may not be used. At this time, the friction between the finger directly pressing the pressing ring and the pressing ring during injection is too large, which will cause the first spring to be subjected to a circumferential torque. Compared with the technical solution of the present invention, this is an inferior technical solution.

Claims

1. A syringe, comprising an injection sleeve, a screw, a fixed tube, a spiral tube and a pressing head, characterized in that: A ball track tube and a ball driving tube sleeved outside the ball track tube are arranged at the rear section inside the fixed tube, wherein a track groove for placing balls is arranged on the outer surface of the ball track tube, an internal thread groove is arranged on the inner tube wall of the ball driving tube, and the ball is located between the track groove and the internal thread groove; The ball track tube covers the connecting coil, and the inner coil covered by the connecting coil is circumferentially positioned between the inner coil and the connecting coil; The spiral tube covers the ball driving tube, and the fixed tube, the ball driving tube, the ball track tube and the connecting spiral tube are axially positioned; The ball drive tube is circumferentially positioned with the spiral tube; The outer cylindrical surface of the spiral tube is provided with an adjusting external thread which is threadably coupled with the adjusting internal thread arranged in the fixed tube, and the elastic friction teeth arranged on the fixed tube match the tooth grooves in the friction toothed disk on the ball driving tube; The rear section of the spiral tube extends out through the rear end of the fixed tube and a graduated toothed disk is provided on the end surface of the spiral tube, the teeth on the graduated toothed disk extend axially, the tail of the inner spiral tube extending out of the spiral tube is provided with pressing teeth matching the tooth grooves on the graduated toothed disk, the central column extending from the inner end of the pressing head extends into the inner spiral tube, the card platform on the inner wall of the inner spiral tube is inserted into the first annular groove of the central column to axially position the inner spiral tube and the pressing head, a pressing ring is placed between the inner spiral tube and the pressing head, and a first spring is provided between the pressing ring and the inner spiral tube; The front section of the fixed tube is provided with a connecting slider and a clutch tube, the connecting slider is circumferentially positioned between the fixed tube, the clutch tube is axially positioned with the connecting slider, and the clutch tube is respectively provided with a first clutch rib, a synchronous rib and a second clutch groove, the first clutch rib matches the first clutch groove in the connecting spiral tube, the synchronous rib matches the synchronous groove in the ball track tube so that the ball track tube and the clutch tube are circumferentially positioned, the inner wall of the stop wheel outside the clutch tube is provided with a second clutch rib matching the second clutch groove, the rear end surface of the stop wheel is provided with a one-way tooth extending in the axial direction matching the tooth groove on the one-way toothed disk fixedly connected to the fixed tube, and a third spring is provided between the stop wheel and the connecting slider so that the one-way tooth presses the one-way tooth; The inner wall of the clutch tube is provided with a synchronous boss extending into the driving axial groove of the screw; The external thread on the screw rod matches the internal driving thread arranged in the fixed tube; The driving internal thread is arranged in a nut, and the nut is arranged in the connecting slider and is circumferentially positioned with the connecting slider; The pressure ring is buckled with the end of the spiral tube.

2. The syringe according to claim 1, characterized in that: The track groove is an axial groove.

3. The syringe according to claim 1, characterized in that: The track groove is a left-handed external thread groove, and the internal thread groove of the ball driving tube is a right-handed internal thread groove.

4. The syringe according to claim 1, 2 or 3, characterized in that: The total displacement of the ball from the starting point to the end point of the track groove corresponds to the total amount of injection in the injection sleeve.

5. The syringe according to claim 4, characterized in that: A second annular groove is provided on the outer cylindrical surface of the nut, and more than three second buckle feet on the nut buckle located in the connecting slider are buckled into the second annular groove, so that the nut and the nut buckle are axially positioned, and a reset clutch rib is provided on the outer cylindrical surface of the nut buckle to match the reset clutch groove on the connecting slider, and a fourth spring is provided between the nut and the connecting slider to enable the reset clutch rib to slide into the reset clutch groove; The nut buckle is provided with a synchronous clamping table extending into the driving axial groove of the screw; When the injection sleeve is installed into the fixed tube, the nut is pushed backwards, so that the reset clutch rib on the nut buckle is separated from the reset clutch groove, and the nut buckle can rotate coaxially relative to the nut; After removing the injection cannula, the nut, under the action of the fourth spring, causes the reset clutch rib to be inserted into the reset clutch groove, so that the screw cannot rotate. When the ball needs to be reset to the starting point, the screw is pushed inward so that the screw drives the nut to move axially backward synchronously for a certain displacement until the reset clutch rib is separated from the reset clutch groove, and the screw starts to rotate forward and reset.

6. The syringe according to claim 1, 2 or 3, characterized in that: The friction toothed disc is arranged at the root of the ball driving tube and extends axially, the friction teeth on the connecting buckle that covers the root of the ball driving tube press the tooth grooves of the friction toothed disc, the three first buckle legs of the connecting buckle pass through the connecting sleeve and are buckled together with the buckle ring, a second spring is arranged between the buckle ring and the connecting sleeve, and the second spring and the friction teeth on the connecting buckle constitute the elastic friction teeth; The connecting sleeve is fixedly connected to the fixing pipe, and the one-way toothed disc is arranged in the connecting sleeve.

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