CN201324413Y - Quantitative adjustable pen type injector - Google Patents

Abstract

The utility model relates to a pen type injector that can be used conveniently and repeatedly and quantitatively, including fixed tube, pushing head, cover seat, separation and reunion cover, rotatory tooth, screw rod, driving tube, check ring, fixed ring, coil, transfer tooth section of thick bamboo, transmission tooth section of thick bamboo, sleeve pipe etc. it adjusts the position of coil relative to the sleeve pipe through rotating the coil tail end thereby adjust the pre-compaction dosage when injecting, in the process of pressing the coil inwards, the coil drives transfer tooth section of thick bamboo, transmission tooth section of thick bamboo, driving tube, rotatory tooth and screw rod rotation, thereby make the screw rod advance forward relative to the cover seat and then give the human injection with the injection ration of laying in the fixed tube; the anti-backing mechanism is arranged in the syringe, so that the push head cannot be backed up even if the coil is adjusted backwards in the next injection.

Description

Quantitative Adjustable Pen Injector

technical field

The utility model relates to an injector, in particular to a quantitatively adjustable pen-type injector.

Background technique

Existing medical syringes include a syringe and a piston. The syringe covers the piston. The front end of the syringe is provided with an injection head to match the needle. When in use, the needle is first put into the injection head, the packaging of the injection is opened, and the injection is completely inhaled. Syringe, insert the needle into the muscle of the relevant person and push the piston to inject the injection into the human body. The shortcoming of this syringe is that the injection in the syringe must be injected into the human body at one time, and some expensive injections such as insulin for injection may cause waste or fail to achieve the best effect.

Contents of the invention

The purpose of the utility model is to solve the problem that the injections in the syringes must be injected into the human body at one time, and the injections cannot be divided into batches, which causes waste in the existing syringes, and to provide a quantitative injection that is easy to use and can be used multiple times. Adjustable pen syringe.

The purpose of this utility model is achieved in this way: a quantitative adjustable pen-type injector, including a fixed tube, a sleeve and a push head, the fixed tube is used to place the injection, and a fixed ring is fixed at the front of the sleeve tube with an internal thread. The front end of the fixed ring is provided with annularly distributed axial teeth to match the axial teeth on the stop ring, and the stop ring is in reverse engagement with the fixed ring; the sleeve is provided with a coil, and the outer cylindrical surface of the coil There is a guide rotor matched with the internal thread of the sleeve, and the inner side of the front end of the coil is provided with annularly distributed axial teeth to match the axial teeth at the front end of the transfer gear cylinder so that the coil is positively meshed with the transfer gear cylinder. The rear end of the gear cylinder is provided with annularly distributed axial teeth that are in reverse engagement with the axial teeth at the front end of the transmission gear cylinder. The rear end of the transmission gear cylinder is the transmission cylinder. A tail spring is provided between them, and the end of the transmission tube extends out of the coil; the head of the transmission tube is located at the front end of the stop ring, and the tail passes through the stop ring, the fixed ring, the front end of the coil tube, the intermediate gear tube, The transmission gear cylinder extends into the transmission cylinder behind, and the outer cylindrical surface of the transmission tube is provided with grooves in the axial direction, and the inner walls of the transmission gear cylinder and the stop ring are respectively provided with ribs that slide and match the grooves, and the head of the transmission tube There are annularly distributed axial teeth on the front end surface of the front end, and an inner spring is arranged between the stop ring and the head of the transmission pipe, and the front end of the head of the transmission pipe is fixed on the sleeve at the front end of the casing to limit the position; A clutch sleeve that can move axially but not rotate is provided between the sleeve seat and the sleeve. An outer spring is provided between the clutch sleeve and the sleeve. A rotating tooth is arranged in the clutch sleeve and positioned axially. The axial teeth arranged on the rear end surface of the rotating tooth match the axial teeth on the front end surface of the transmission pipe head, wherein the axial teeth on the front end surface of the transmission pipe positively mesh with the axial teeth of the rotating tooth, and are located in the transmission pipe. The front end of the screw rod in the tube passes through the through hole in the center of the rotating tooth and is coupled with the internal thread of the clutch sleeve. The front end of the screw rod is clamped with a push head that can rotate relative to the screw rod. The central through hole of the rotating tooth is provided with a pressing surface that presses the plane so that the two can rotate synchronously. The forward and reverse in the forward meshing and reverse meshing described in the utility model are relative terms; the positive meshing means that when the active part is rotated in the forward direction, the driven part is subjected to tangential force While rotating with the active part, if the active part rotates in the opposite direction, the driven part will also receive an axial force without rotating with the active part, and the driven part will slip relative to the active part, unless the axial direction of the driven part is limited at this time. When the driven part is rotated in the opposite direction, the driven part drives the active part to reverse; on the contrary, the reverse engagement means that when the active part is rotated in the opposite direction, the driven part also rotates in the opposite direction.

The quantitative adjustable pen type injector is characterized in that a one-way ratchet head is provided on the front end surface of the coiled tube to match the one-way ratchet groove on the rear end surface of the fixed ring.

The quantitative adjustable pen type injector is characterized in that a scale is provided outside the sleeve.

Due to the adoption of the technical solution described in the utility model, when injecting some more expensive medicines, the quantitative adjustment can be carried out according to different needs, and then injected, and it has a self-locking mechanism, after the first injection, even if Without pulling out the needle, the blood in the human body will not flow back into the injection pen. It is convenient to use and has a simple structure. Users can perform multiple injections in small doses according to actual needs to achieve the best therapeutic effect.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a three-dimensional exploded view of an embodiment of the quantitatively adjustable pen-type injector of the present invention.

Fig. 2 is an enlarged view of the interior visible after removing the fixing tube and cutting off a part in Fig. 1 .

Fig. 3 is a schematic diagram after removing the screw rod and the transmission tube in Fig. 2 .

Fig. 4 is a three-dimensional enlarged view when the rotating tooth in Fig. 1 is installed in the clutch sleeve.

FIG. 5 is a schematic diagram of another angle of the rotating tooth in FIG. 4 .

Fig. 6 is a schematic diagram of another angle of the clutch sleeve in Fig. 4 .

Fig. 7 is an enlarged view of another angle of the fixed ring in Fig. 1 .

Fig. 8 is an enlarged view of another angle of the stop ring in Fig. 1 .

Fig. 9 is a perspective enlarged view of another angle of the screw in Fig. 1 .

Fig. 10 is a perspective enlarged view of another angle of the transmission tube in Fig. 1 .

Fig. 11 is a perspective enlarged view of another angle of the coil in Fig. 1 .

In the figure 1, fixed pipe, 2, push head, 3, sleeve seat, 4, clutch sleeve, 5, rotating tooth, 6, screw rod, 7, transmission pipe, 8, stop ring, 9, fixed ring, 10, rotary Tube, 11, transfer gear cylinder, 12, transmission gear cylinder, 13, transmission cylinder, 14, casing, 15, shell, 16, window cover, 17, cover plate, 18, knob, 19, pressure head; 31, limit Bit head, 71, head, 20, inner spring, 21, outer spring, 22, tail spring, 41, thread, 42, pressing wing, 51, outer ring, 52, pressing surface, 90, clamping platform, 91, One-way ratchet, 92, axial tooth, 81, rib, 61, chuck, 62, plane, 72, axial tooth, 73, slot, 101, guide rotor, 102, axial tooth, 103, one-way ratchet head.

Detailed ways:

As shown in Figure 1, the quantitatively adjustable pen-type injector includes a fixed tube 1, a push head 2, a sleeve seat 3, a clutch sleeve 4, a rotating tooth 5, a screw rod 6, a transmission tube 7, a stop ring 8, and a fixed ring 9. Rotary tube 10, transfer gear cylinder 11, transmission gear cylinder 12, transmission cylinder 13, sleeve pipe 14, casing 15, window cover 16, cover plate 17, knob 18, pressure head 19; the thread at the front end of the fixed pipe 1 is used For the installation of the needle, the threaded connection between the fixed tube and the socket. A sleeve can also be configured outside the fixed tube for protection during storage. Its overall shape is like a pen, so it can also be called a quantitatively adjustable injection pen.

See Fig. 3, sleeve seat 3 and sleeve pipe 14 are all fixed in shell 15, fixed ring 9 is fixed on the front part of sleeve pipe 14 with left-handed internal thread, and the front end face of fixed ring 9 is provided with annularly distributed axial teeth ( See the axial teeth 92 in Fig. 7) to match the axial teeth on the stop ring 8, and the stop ring is in reverse engagement with the fixed ring; A guide rotor 101 (see Figure 11) matching the internal thread of the casing is provided, and the inner side of the front end of the coil 10 is provided with annularly distributed axial teeth 102 (see Figure 11) and the axial teeth of the front end of the transfer gear cylinder 11. The teeth are matched so that the coil tube is positively meshed with the transfer gear cylinder. The rear end of the relay gear cylinder 11 is provided with annularly distributed axial teeth that are reversely meshed with the axial teeth at the front end of the transmission gear cylinder 12. The rear end of the transmission gear cylinder 12 is a transmission cylinder. 13. A tail spring 22 is provided between the rear end of the transmission cylinder 13 and the knob 18, the tail of the knob 18 is fixed to the tail of the coil 10, and the end of the transmission cylinder 13 extends out of the coil and the knob and is fixed with the pressure head 19; the knob The outer end of 18 stretches out of the shell 15.

As shown in Figure 2, the head 71 of the transmission pipe 7 is located at the front end of the stop ring 8, and the tail passes through the stop ring 8, the fixed ring 9, the front end of the coil 10, the transfer gear cylinder 11, the transmission gear cylinder 12 and then extends into the transmission cylinder 13 , the outer cylindrical surface of the transmission tube 7 is axially provided with grooves (see the groove 73 shown in Figure 10), and the inner walls of the transmission gear cylinder 12 and the stop ring 8 are respectively provided with ribs 121 and 81 that are slidingly matched with the groove 73. , the front end face of the head of the transmission tube 7 is provided with annularly distributed axial teeth (see the axial teeth 72 in Figure 10), and an inner spring 20 is provided between the stop ring 8 and the head 71 of the transmission tube 7 , the front end of the head 71 of the transmission pipe is limited by the limit head 31 of the sleeve 3; There is an outer spring 21, and the rotating tooth 5 is placed in the cavity of the clutch sleeve 4 and is axially positioned by the pressure wing 42 in the clutch sleeve (as shown in FIG. position, and the right end is pressed against the outer ring 51 by the pressure wing 42 and is limited), the axial teeth arranged on the rear end surface of the rotating tooth 5 match the axial teeth on the front end surface of the transmission tube 7 head, and the front end of the screw rod 6 wears After passing through the through hole in the center of the rotating tooth 5, it is coupled with the internal thread of the clutch sleeve 4. The front end of the screw 6 is clamped with a push head 2 that can rotate relative to the screw. Both sides of the outer cylindrical surface of the screw are symmetrically provided with axially penetrating through its surface. (only one plane 62 is shown in Figure 9), and the central through hole of the rotating tooth is provided with two pressing surfaces (see pressing surface 52 in Figure 5) that clamp the planes on both sides of the screw so that both can Synchronized rotation.

As shown in FIG. 11 , three one-way ratchet heads 103 are provided on the front end of the coiled tube 10 to match the three one-way ratchet grooves 91 on the fixed ring in FIG. 7 . In FIG. 7 , the two clamping platforms 90 on both sides of the fixed ring are snapped into the gaps in the bushing in FIG. 1 , so that the fixed ring cannot rotate.

The action process during use is as follows: the thread inside the casing is a left-handed thread, as shown in Figure 2 (in Figure 2, the pressure head 19 is the near side, the push head 2 is the far side, and the counterclockwise direction is the forward direction). Put the injection into the fixed tube, and then screw the fixed tube into the front end of the sleeve. At this time, if the push head 6 at the left end of the screw sticks out of the sleeve 3, the screw 6 will be pushed to the right under the action of the injection package in the fixed tube. And reverse rotation, but at this time because the rotating tooth 5 is separated from the axial teeth on the front end of the transmission tube 7, the screw can only idle and will not drive the transmission tube 7 to rotate until the inner ring of the fixed tube withstands the clutch sleeve 4 The foot at the left end overcomes the elastic force of the outer spring 21 and pushes the clutch sleeve 4 to the right, so that the rotating teeth 5 mesh with the axial teeth on the front end surface of the transmission pipe 7 (the two are separated in Figure 2), and move toward the front end of the fixed pipe. Insert the needle, turn the tail of the knob 18 in the opposite direction (clockwise), and drive the coil to rotate in the opposite direction. At this time, please turn to Figure 3, because the axial teeth on the inner wall of the left end of the coil are positively engaged with the intermediate gears The axial teeth at the front end of the barrel 11, the transfer gear barrel 11 receives a rightward axial force and pushes the transmission gear barrel 12 and the transmission barrel 13 to overcome the spring of the tail spring 22 to move to the right, that is, between the rotary tube 10 and the transfer gear barrel 11 Therefore, neither the relay gear cylinder 11 nor the transmission gear cylinder 12 rotates, nor does the transmission tube in Fig. , the tail spring 22 and the pressure head 19 move to the right together. If the reverse rotation is too far, the knob 18 can be rotated in the positive direction. The gear cylinder 12 also rotates in the forward direction. However, because the relay gear cylinder 11 engages the transmission gear cylinder 12 in reverse, the transmission gear cylinder 12 is subjected to the rightward axial force and overcomes the elastic force of the tail spring to move to the right and relative to the relay gear cylinder. 11 slips, it will not drive the transmission tube to rotate, but will only drive the coil to move axially; after adjusting to the required scale, hold the shell 15 and press the right end of the pressure head 19 to the left with your thumb, and the coil 10 will be After the thrust to the left, it rotates forward (counterclockwise) relative to the casing 14 under the action of the guide rotor, and the axial teeth on the inner side of the left end of the coil 10 positively mesh with the intermediate gear cylinder 11——the intermediate gear cylinder 11 rotates forward. Although the transfer gear cylinder 11 reversely meshes with the transmission gear cylinder 12, but because the female finger presses the rear part (right end) of the pressure head 19, the transmission gear cylinder 12, the transmission cylinder 13 and the pressure head 19 cannot move to the right. Therefore, the transmission The gear cylinder 12 can only rotate in the forward direction. The ribs 121 in the transmission gear cylinder 12 drive the transmission tube 7 to rotate in the forward direction. (See the pressing surface 52 in Figure 5) Clamp the screw rod 6 to rotate forward and advance to the left (the thread of the screw rod 6 is a left-handed thread), thereby driving the push head 2 to press the injection package in the fixed tube in Figure 1 to pack The injection liquid is injected into the body; during the process of forward rotation of the transmission tube 7, the stop ring 8 slips relative to the fixed ring 9, and after the injection is completed, after the thumb finger pressing the pressure head 9 is released, if it is in the human body Blood Under the action of pressure, the screw rod 6 is subjected to a rightward thrust, the screw rod is subjected to a reverse rotation torque, and the transmission tube 7 is also subjected to a reverse rotation force. The ring 9 cannot rotate, so the transmission tube 7 is locked and cannot rotate in reverse, and the screw rod 6 cannot rotate in reverse.

Claims (3)

1, a kind of quantitative adjustable pen-type injector, comprise stationary pipes, sleeve pipe and cut somebody's hair, stationary pipes is used to lay injection, it is characterized in that tapped sleeve pipe front portion is fixed with decides ring, the front end face that should decide to encircle is provided with the axial tooth of annular spread and the axial tooth on the locating snap ring matches, and locating snap ring oppositely meshes fixed ring; Be provided with coil in the described sleeve pipe, this coil outer cylinder is provided with described telescopic female thread matches and leads rotor, the axial tooth that coil front end inboard is provided with the axial tooth of annular spread and transfer tooth tube front end matches and makes coil to transfer tooth tube positive engagement, the axial tooth that transfer tooth tube rear end is provided with annular spread oppositely meshes the axial tooth of driving cog tube front end, the driving cog tube rear end is a transmission cylinder, transmission cylinder rear end and stretch out and be provided with the tail spring between the coil rear end of sleeve pipe rear end and the transmission cylinder end stretches out outside the described coil; The head of transmission tube is positioned at described locating snap ring front end, afterbody stretches into transmission cylinder after passing described locating snap ring, fixed ring, coil front end, transfer tooth tube, driving cog tube, outer cylinder at this transmission tube is provided with groove vertically, be respectively equipped with the muscle that slides and match with this groove at described driving cog tube and locating snap ring inwall, the head front end face of transmission tube is provided with the axial tooth of annular spread, be provided with inner spring between described locating snap ring and transmission tube head, it is spacing that the head front end of transmission tube is fixed on the block set of sleeve pipe front end; Between described block set and sleeve pipe, be provided with clutch cover, be provided with outer spring between this clutch cover and the sleeve pipe, one rotary teeth is arranged in the clutch cover and is axially located, axial tooth on axial tooth that is provided with on the rear end face of described rotary teeth and the described transmission tube head front end face matches, the axial tooth of this rotary teeth of axial tooth positive engagement of transmission tube front end face wherein, the screw front end that is positioned at transmission tube passes behind the through hole of rotary teeth central authorities the female thread coupling with clutch cover, screw front end is connected with can be with respect to cutting somebody's hair that screw rod rotates, the outer cylinder of screw rod is provided with and axially runs through its surperficial plane, and the center through hole of rotary teeth is provided with to be pushed down this planar stitching surface both can be rotated synchronously.

2,, it is characterized in that the unidirectional sour jujube groove that the coil front end face is provided with on unidirectional sour jujube head and the described fixed rear end face that encircles matches according to the described quantitative adjustable pen-type injector of claim 1.

3, according to the described quantitative adjustable pen-type injector of claim 1, it is characterized in that described sleeve pipe is provided with scale outward.

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