A safety insulin syringe

Abstract

The present invention discloses a safe insulin syringe, which relates to the technical field of syringes and includes a barrel. A piston shaft is slidably arranged axially in the barrel, and the other end of the piston shaft is connected with a piston handle. A finger pressing plate is connected to the outer wall of the open end of the barrel where the piston handle is located. A first housing and a second housing are arranged in the barrel. A first rotating ring and a second rotating ring are further arranged between the first housing and the second housing. A first reset member is arranged between the first rotating ring and the first housing, and a second reset member is arranged between the first rotating ring and the second rotating ring. A transmission ring is arranged in the middle of the first rotating ring. A spiral body is arranged on the side wall of the piston shaft. In this safe insulin syringe, by setting a structure that can limit the advancement amount of the piston shaft at any position, the syringe can perform quantitative injection, thereby forcing the user to develop good and regular injection habits and avoiding habitual injection, which may cause local subcutaneous induration and adverse reactions.

Description

Technical Field

[0001] The present invention relates to the technical field of syringes, and particularly to a safe insulin syringe. Background Technique

[0002] Injecting (physiological requirement) insulin is considered the most effective, scientific, and closest to the insulin secretion of the human pancreas alternative therapy for blood glucose control in diabetic patients. Insulin is a protein that needs to be ingested into the human body by injection or intravenous infusion to play its role.

[0003] The most common injection method for insulin injection is subcutaneous injection, which mainly injects insulin into the subcutaneous tissue of the human body through a syringe or an insulin pen. Since the insulin pen uses a specific insulin container that can be directly installed into the insulin pen, the insulin pen can be used to replace insulin and reused. However, during the use process, the front end of the insulin pen that comes into contact with the human body needs to be disinfected and other treatments. The disposable one can be used directly but cannot be reused. Both have their own advantages and disadvantages, and diabetic patients in life choose to use them according to their own situations.

[0004] Since the injection amount of insulin will be quantified according to different blood glucose situations, and injecting too much insulin at the same position will affect local blood circulation, leading to subcutaneous tissue atrophy, thus causing subcutaneous induration. Moreover, the physical constitutions of each patient are different, so their local maximum injection amounts will also be different. However, the existing disposable insulin syringes cannot perform quantitative injection, and since insulin is a drug for long-term use, for patients using disposable syringes, a regular habit of injecting all at once is formed, and local small-scale subcutaneous induration is defaulted as a side effect, which is not conducive to the health of patients. For this reason, we propose a safe insulin syringe. Summary of the Invention

[0005] The purpose of the present invention is to provide a safe insulin syringe to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present invention provides the following technical solution: A safety insulin syringe, comprising a barrel, a piston shaft is slidably arranged axially in the barrel, one end of the piston shaft located in the barrel slides with the inner wall of the barrel through a piston, the other end of the piston shaft is connected with a piston handle, a finger pressing plate is connected to the outer wall of the open end of the barrel where the piston handle is located, the inner wall of the open end of the barrel is provided with a first housing and a second housing, both the first housing and the second housing are annular bodies, the inside of the first housing is in the shape of a stepped shaft, and is slidably sleeved and fixed axially with the outer wall of the second housing, a first rotating ring and a second rotating ring are further arranged between the first housing and the second housing, the opposite sides of the first rotating ring and the second rotating ring are provided with saw-tooth-shaped teeth evenly distributed in a circumference, and the saw-tooth-shaped teeth of both face the same direction, a first restoring member for making the first rotating ring rotate and reset circumferentially is arranged between the first rotating ring and the first housing, a second restoring member is arranged between the first rotating ring and the second rotating ring, the second restoring member makes the second rotating ring move axially away from the first rotating ring in a state of not being stressed, a transmission ring is arranged in the middle of the first rotating ring, at least one group of helices is arranged on the side wall of the piston shaft, and this helix is located on the maximum outer diameter surface of the piston shaft, the helix is slidably connected with the transmission ring, when the helix moves with the piston shaft, it drives the transmission ring to rotate in a specific direction, locking blocks that mutually hinder rotation are connected to the outer side wall of the first rotating ring and the end of the second housing respectively, when the piston shaft is pushed forward, it drives the transmission ring to rotate, and the second rotating ring moves towards the first rotating ring and synchronously rotates through the meshing of the saw-tooth-shaped teeth, and the second rotating ring is locked and limited when the two locking blocks come into contact after rotation.

[0007] Preferably, columnar ribs in the shape of a curved surface body are provided on the contact surfaces between the inner walls of the first housing and the second housing and the first rotating ring and the second rotating ring respectively.

[0008] Preferably, a flange is integrally arranged on the outer wall of the first housing, and is fastened and fixed with the finger pressing plate through the flange.

[0009] Preferably, an extension ring is provided at the end of the second housing away from the first housing, a fixing ring threadedly connected with the first housing is sleeved on the outer wall of the extension ring, the extension ring extends beyond the flange on the first housing and the end face of the fixing ring, and a pointer and a scale line that cooperate with each other are provided on the outer wall of the extension ring and the outer wall of the barrel.

[0010] Preferably, the helix is divided into a variable diameter section and a smooth section along the advancing direction of the piston shaft, in the state where the piston shaft is completely pushed into the barrel, the helix on the part of the piston shaft located outside the barrel is the variable diameter section, and the diameter increases gradually along the extension towards the other end from the piston handle, and the diameter of the helix in the smooth section is fixed.

[0011] Preferably, the transmission ring is composed of two semi-ring bodies connected by any diameter line as a dividing line.

[0012] Preferably, an enlarged diameter cavity is provided at the open end of the barrel

[0013] Preferably, the piston shaft is composed of three sets of helices and is evenly spaced along the circumference.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] By providing a structure that can limit the advancement amount of the piston shaft at any position, the syringe of the present invention can perform quantitative injection, thereby forcing the user to develop good and regular injection habits and avoiding habitual injection, which may cause local subcutaneous induration and adverse reactions.

[0016] By providing the rotation of the second housing and cooperating with the scale and the pointer, the present invention can adjust the range of the injection amount limit, so as to be adjusted according to the short-term physical condition of the user, which is convenient for use.

[0017] The structure for limiting the advancement of the piston shaft provided by the present invention only requires plastic and two sets of springs to complete, and its production cost has a relatively small increase compared with traditional syringes, which is conducive to popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic diagram of the overall half-sectional structure of the present invention;

[0020] Figure 3 is Figure 2 an enlarged schematic diagram of the structure of area A in

[0021] Figure 4 is a developed schematic diagram of the structure between the first housing and the fixing ring 17;

[0022] Figure 5 is Figure 4 an enlarged schematic diagram of the structure of area B in

[0023] Figure 6 is a schematic diagram of the scale on the syringe;

[0024] Figure 7 is a top view of the end face on the opposite side of the first housing and the second housing;

[0025] Figure 8 is a schematic diagram of the segmented state of the helix;

[0026] Figure 9 is a schematic diagram of the end face of the piston shaft at one end of the piston handle;

[0027] Figure 10 is a schematic diagram of the structure of the enlarged diameter cavity;

[0028] Figure 11Schematic diagram of the insertion between the semi-ring bodies of the transmission ring.

[0029] In the figure: 1-empty cylinder; 2-piston shaft; 3-piston handle; 4-finger pressing plate; 5-first housing; 6-second housing; 7-first rotating ring; 8-second rotating ring; 9-first reset member; 10-second reset member; 11-transmission ring; 12-spiral body; 13-lock block; 14-convex rib; 15-flange; 16-extension ring; 17-fixed ring; 18-variable diameter section; 19-smooth section; 20-diameter expansion cavity. Detailed implementation

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The present invention provides a technical solution: a safety insulin syringe, including an empty cylinder 1. The empty cylinder 1 is the main body of the syringe, one end is open, the other end is connected to a nipple, and a needle is connected through the nipple. A finger pressing plate 4 is connected to the outer side wall of the open end of the empty cylinder 1. A piston for sealing is slidably connected to the inner wall of the empty cylinder 1. The piston is detachably connected to the end of the piston shaft 2 near the open end of the empty cylinder 1. The other end of the piston shaft 2 is fixedly connected to the piston handle 3, and the piston handle 3 facilitates the finger to push the piston shaft 2;

[0032] On the inner wall of the open end of the empty cylinder 1, a second housing 6, a second rotating ring 8, a second reset member 10, a first rotating ring 7, a first reset member 9 and a first housing 5 are sequentially arranged along the injection direction. The inner wall of the first housing 5 is sleeved and fixed with the outer wall of the first housing 5;

[0033] The first housing 5 is an annular body with at least one step on its inner wall, so as to limit the position of the end state of the installation of the second housing 6 and avoid squeezing other components. The first housing 5 is fixed to the inner wall of the empty cylinder 1 and is not integrated to facilitate assembly. The first rotating ring 7 and the second rotating ring 8 can rotate freely in the first housing 5 and the second housing 6 respectively. The second reset member 10 between the first rotating ring 7 and the second rotating ring 8 is used to generate a repulsive force in the non-propulsion state, so that their opposite surfaces do not fit. Considering cost issues, it is preferably a spring. Serrated teeth that can be misaligned and engaged are provided on the surfaces of the opposite sides of the first rotating ring 7 and the second rotating ring 8, and they can be engaged and rotated synchronously in one rotation direction. Annular grooves are also provided on the opposite sides of the first rotating ring 7 and the second rotating ring 8, and the annular grooves are used to install and limit the position of the second reset member 10;

[0034] The first reset member 9 provided between the opposite side of the first rotating ring 7 and the first housing 5 is also a thin-diameter spring under the consideration of cost, but different from the helical cylindrical spring of the second reset member 10, the first reset member 9 is a planar spiral hairspring that generates torsion, so as to be used for the rotational reset of the first rotating ring 7. The two ends of the first reset member 9 are respectively fixed to the first housing 5 and the first rotating ring 7;

[0035] The inner diameter side wall of the second rotating ring 8 is fixedly connected with a transmission ring 11. A notch groove matching with the spiral body 12 is provided on the transmission ring 11. At least one group of spiral bodies 12 is provided, so that when pushing, the spiral can be used to drive the transmission ring 11 to rotate. The outer diameter surface of the spiral body 12 is larger than the outer wall of other radial surfaces of the piston shaft 2 at the same axial position, so as not to interfere with the rotation of the transmission ring 11;

[0036] In use, the operator first pulls the piston shaft 2 to generate negative pressure for sucking the liquid medicine. In the pulled state, since the second rotating ring 8 is subjected to a pulling force along the axial direction away from the end of the needle (caused by the transmission ring 11), there is no fitting and synchronization between the second rotating ring 8 and the first rotating ring 7. Therefore, only the second rotating ring 8 rotates. After sucking the liquid medicine, injection starts. By pushing the piston handle 3, at this time, because the spiral body 12 on the piston shaft 2 exerts a pressure on the transmission ring 11 in the injection direction, the second rotating ring 8 presses the second reset member 10 and fits with the end face of the first rotating ring 7, and after the serrated teeth are engaged, the two rotate synchronously. The orientations of the serrated teeth of the two are the same, that is, both counterclockwise or clockwise, depending on the spiral direction of the spiral body 12. The left-handed or right-handed spiral direction of the spiral body 12 will cause the direction of the second rotating ring 8 to be opposite. After synchronization, as the injection continues, the first rotating ring 7 rotates. After the locking block 13 on the first rotating ring 7 rotates to abut against the locking block 13 on the second housing 6, the rotation of the second rotating ring 8 is restricted, which causes the piston shaft 2 not to be able to be advanced, thus achieving the purpose of quantification. And the specific quantification amount is set by setting the pitch of the spiral body 12 according to the empty cylinder 1 with different diameters, so that each advancement is a set range amount, preventing over-injection at the same position, playing a reminder role, and also forcing the user to develop a regular and standardized injection habit. And at the moment of releasing after the advancement stops (for transposition injection), due to the action of the second reset member 10, the second rotating ring 8 is pushed back. Because the driving force is lost, the first rotating ring 7 also rotates and resets in the opposite direction under the action of the first reset member 9, so that injection can be carried out again when the piston shaft 2 is pushed again for the second time. That is, this syringe can only inject a set amount each time. For the second injection or the third injection, no complex operation is required. Only the piston shaft 2 needs to be pushed again, which is simple and convenient.

[0037] Refer to Figure 4 and Figure 5 as well as Figure 7 , specifically, convex ribs 14 are provided on the inner circumferential surface of the first housing 5, the inner circumferential surface of the second housing 6, and the inner end face, that is, the surfaces in contact with the first rotating ring 7 and the second rotating ring 8. The cross-section of the convex rib 14 is semicircular, so as to reduce the friction of relative rotation of each contact surface. And between the first rotating ring 7 and the first housing 5, it can be not provided because the first reset member 9 can play an isolation role;

[0038] As another embodiment, these convex ribs 14 can also be provided on the surfaces of the first rotating ring 7 and the second rotating ring 8. At least reducing the contact surface can reduce the friction. Since the syringe is a disposable component, these convex ribs 14 can be set very small without considering reuse after wear.

[0039] Refer to Figure 2 and Figure 4, in order to facilitate the installation and positioning of the first housing 5, a flange 15 is provided. The flange 15 is similar to the finger pressure plate 4, and the finger pressure plate 4 and the flange 15 are connected by buckling. The buckling method is fixed by a simple detachable method such as interference fit of a hole and a shaft, or can be positioned by hole and shaft fit, and connected with glue, etc., and a direct fixing method is adopted.

[0040] Reference Figure 2 , Figure 4 and Figure 6 , in the above-mentioned embodiments, only quantitative injection can be performed on the injection volume and cannot be adjusted. For the physical fitness of different patients and different blood glucose levels at different time periods, adaptive adjustment cannot be performed. Therefore, the second housing 6 is set to be rotatable to change the initial position of the locking block 13 on the second housing 6, so as to change the maximum rotation angle of the first rotating ring 7 and achieve adjustability;

[0041] Specifically, the second housing 6 is only sleeved with the first housing 5 along the axial direction, and the two are not directly fixed. An extension ring 16 is provided on one end face of the second housing 6 away from the first housing 5. The extension ring 16 and the second housing 6 present a stepped shaft shape. The fixing ring 17 is sleeved on the step formed by the second housing 6 and the extension ring 16, and an extension is provided on the end face of the fixing ring 17 towards the inner wall of the first housing 5 and an external thread is provided. The external thread is fixed with the internal thread on the inner wall of the first housing 5 to limit and lock the second housing 6;

[0042] Scales or pointers are provided on the second housing 6, and correspondingly, pointers or scales are provided on the syringe barrel 1, so that the adjustment range can be observed.

[0043] Refer to Figure 8 and Figure 9 , in order to reduce production costs, the spiral body 12 on the piston shaft 2 is set in two sections. The diameter of one section is fixed, that is, the stable state, and the other section is a variable diameter section 18. The variable diameter section 18 starts from one end of the piston handle 3 and the diameter increases towards the other end until it reaches the smooth section 19. The demarcation point between the two sections is that when the piston shaft 2 is completely pushed into the syringe barrel 1, it is at the junction of the part of the piston shaft 2 outside the syringe barrel 1 and the part inside the syringe barrel 1, and at the same time, the diameter of the piston handle 3 is smaller than the inner diameter of the transmission ring 11, so that the transmission ring 11 can be directly sleeved from the end where the piston shaft 2 is connected to the piston handle 3;

[0044] In order to have better strength and stability, the piston shaft 2 is composed of three groups of spiral bodies 12 evenly distributed along the circumference.

[0045] Refer to Figure 7 and Figure 11, which is different from the previous embodiment, the assembly cost can be reduced by changing the structure of the transmission ring 11, that is, the transmission ring 11 is divided into two semi-ring bodies, and the butt joint surfaces of the two semi-ring bodies are respectively provided with grooves and holes, and assembled by plugging, so as to be assembled to the transmission ring 11. Since the transmission ring 11 is fixed on the second housing 6, the second housing 6 is configured as two semi-ring bodies;

[0046] Furthermore, the first housing 5, the first swivel 7 and the second swivel 8 can also be configured as a semi-ring assembly structure, because the outer wall has a hollow cylinder 1 that can be restricted;

[0047] Furthermore, in the embodiment in which the piston shaft 2 is composed of three groups of spiral bodies 12 evenly distributed along the circumference, the transmission ring 11 is divided by taking the diameter of one of the grooves (the groove in which the transmission ring 11 and the spiral body 12 slide) as the dividing point.

[0048] See also Figure 10 For a syringe with an extremely small diameter of the empty barrel 1, the above solution will make the parts extremely small. Parts that are too small will lead to an increase in production costs. Therefore, for a disposable syringe with a small diameter of the empty barrel 1, a trumpet-shaped expansion cavity 20 can be set at the open end to adapt by partially expanding the diameter, thereby avoiding an increase in production costs.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safe insulin syringe, comprising an empty barrel (1), a piston shaft (2) being provided in the empty barrel (1) so as to slide along the axial direction, one end of the piston shaft (2) being located in the empty barrel (1) slidingly sliding with the inner wall of the empty barrel (1) through the piston, the other end of the piston shaft (2) being connected to a piston handle (3), and an outer wall of the open end of the empty barrel (1) located at the piston handle (3) being connected to a finger pressure plate (4), characterized in that: The inner wall of the open end of the hollow cylinder (1) is provided with a first shell (5) and a second shell (6), both of which are annular bodies, the first shell (5) is in the shape of a stepped shaft, and is slidably sleeved and fixed to the outer wall of the second shell (6) along the axial direction, a first rotating ring (7) and a second rotating ring (8) are also provided between the first shell (5) and the second shell (6), saw-like teeth evenly distributed in the circumference are provided on the opposite sides of the first rotating ring (7) and the second rotating ring (8), and the saw-like teeth of the two are oriented in the same direction, a first reset member (9) for resetting the circumferential rotation of the first rotating ring (7) is provided between the first rotating ring (7) and the first shell (5), and a second reset member (10) is provided between the first rotating ring (7) and the second rotating ring (8), and the second reset member (10) enables the second rotating ring (8) to be reset when not subjected to force The piston shaft (2) is in a state of axially moving away from the first rotating ring (7), a transmission ring (11) is provided in the middle of the first rotating ring (7), the side wall of the piston shaft (2) is provided with at least one group of spiral bodies (12), and the spiral bodies (12) are located on the maximum outer diameter surface of the piston shaft (2), the spiral bodies (12) are slidably connected to the transmission ring (11), and when the spiral bodies (12) move with the piston shaft (2), the transmission ring (11) is driven to rotate in a directional manner, the outer side wall of the first rotating ring (7) and the end of the second housing (6) are connected with locking blocks (13) that hinder each other from rotating, and when the piston shaft (2) is advanced, the transmission ring (11) is driven to rotate, and the second rotating ring (8) moves toward the first rotating ring (7) and rotates synchronously through the meshing of the saw-shaped teeth, and after the second rotating ring (8) rotates, it is locked and limited when the two groups of locking blocks (13) contact.

2. A safe insulin syringe according to claim 1, characterized in that: The contact surfaces of the inner walls of the first shell (5) and the second shell (6) with the first rotating ring (7) and the second rotating ring (8) are respectively provided with columnar convex ribs (14) of a curved surface.

3. A safe insulin syringe according to claim 1, characterized in that: The outer wall of the first shell (5) is integrally provided with a flange (15), and is buckled and fixed to the finger pressure plate (4) via the flange (15).

4. A safe insulin syringe according to claim 1, characterized in that: An extension ring (16) is provided at the end of the second shell (6) away from the first shell (5); a fixing ring (17) threadedly connected to the first shell (5) is sleeved on the outer wall of the extension ring (16); the extension ring (16) extends beyond the flange (15) on the first shell (5) and the end surface of the fixing ring (17); and pointers and scale lines that match each other are provided on the outer wall of the extension ring (16) and the outer wall of the hollow cylinder (1).

5. A safe insulin syringe according to claim 1, characterized in that: The spiral body (12) is divided into a reduced diameter section (18) and a smooth section (19) along the advancing direction of the piston shaft (2); when the piston shaft (2) is completely advanced into the hollow cylinder (1), the spiral body (12) on the portion of the piston shaft (2) located outside the hollow cylinder (1) is the reduced diameter section (18), which increases in diameter as it extends along the piston handle (3) toward the other end, and the spiral body (12) in the smooth section (19) has a fixed diameter.

6. A safe insulin syringe according to claim 1, characterized in that: The transmission ring (11) is formed by connecting two half ring bodies with an arbitrary diameter line as a dividing line.

7. A safety insulin syringe according to any one of claims 1 to 6, characterized in that: The open end of the hollow cylinder (1) is provided with a diameter expansion cavity (20).

8. A safe insulin syringe according to claim 1 or 5, characterized in that: The piston shaft (2) is composed of three groups of spiral bodies (12) which are evenly spaced along the circumference.

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