Safety insulin syringe

Abstract

The invention discloses a safety insulin syringe, and relates to the technical field of syringes, the safety insulin syringe comprises an empty cylinder, a piston shaft is slidably arranged in the empty cylinder along the axial direction, the other end of the piston shaft is connected with a piston handle, the outer wall of the empty cylinder at the opening end of the piston handle is connected with a shiatsu plate, and a first shell and a second shell are arranged in the empty cylinder. A first rotating ring and a second rotating ring are further arranged between the first shell and the second shell, a first reset piece is arranged between the first rotating ring and the first shell, a second reset piece 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, and a spiral body is arranged on the side wall of the piston shaft. By arranging the structure capable of limiting the propelling amount of the piston shaft at any position, the injector can perform quantitative injection, so that a user is forced to generate a good and regular injection habit, and local subcutaneous induration and adverse reaction caused by habitual injection are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of syringes, in particular to a safe insulin syringe. Background Art

[0002] Injection (physiological demand) of insulin is considered to be the most effective, scientific and closest replacement therapy for diabetic patients to control blood sugar. Insulin is a protein that needs to be injected or infused intravenously to work in the human body.

[0003] The most common way of insulin injection is subcutaneous injection, which mainly injects insulin into the subcutaneous tissue of the human body through a syringe or injection pen. The insulin pen uses a specific insulin container that can be directly installed in the insulin pen, so that the insulin pen can be replaced with insulin and reused. However, during use, the front end of the insulin pen that contacts the human body also needs to be disinfected. Disposable ones can be used directly but cannot be reused. Both have their advantages and disadvantages. In life, diabetic patients can choose the practical one according to their own situation.

[0004] Because the amount of insulin injected will be quantified according to different blood sugar conditions, and because too much insulin is injected in the same location, it will affect local blood circulation, causing atrophy of subcutaneous tissue, thus causing subcutaneous nodules, and each patient has a different physique, so the local maximum injection amount will also be different, but the existing disposable insulin syringe cannot be quantitatively injected, and because insulin is a long-term drug, patients who use disposable syringes have formed a regular habit of one-time injection, and local small-scale subcutaneous nodules are assumed to be side effects, which is not good for the health of patients. To this end, we propose a safe insulin syringe. Summary of the invention

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

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a safe insulin syringe, comprising a hollow barrel, a piston shaft is axially slidably arranged in the hollow barrel, one end of the piston shaft located in the hollow barrel slides with the inner wall of the hollow barrel through a piston, the other end of the piston shaft is connected to a piston handle, and the outer wall of the open end of the hollow barrel located at the piston handle is connected to a finger pressure plate, the inner wall of the open end of the hollow barrel is provided with a first shell and a second shell, both of which are annular bodies, the first shell is in the shape of a stepped shaft, and is axially slidably sleeved and fixed with the outer wall of the second shell, a first swivel and a second swivel are further arranged between the first shell and the second shell, the opposite sides of the first swivel and the second swivel are provided with serrated teeth evenly divided by the circumference, and the serrated teeth of the two are oriented in the same direction, and the first swivel and the first swivel are oriented in the same direction. A first reset member is provided between the shells to reset the circular rotation of the first swivel, and a second reset member is provided between the first swivel and the second swivel. The second reset member enables the second swivel to axially move away from the first swivel in a stress-free state. A transmission ring is provided in the middle of the first swivel, and at least one group of spirals is provided on the side wall of the piston shaft, and the spirals are located on the maximum outer diameter surface of the piston shaft. The spirals are slidably connected to the transmission ring, and the transmission ring is driven to rotate in a directional manner when the spirals move with the piston shaft. The outer side wall of the first swivel and the end of the second shell are connected with locking blocks that hinder rotation of each other. When the piston shaft is advanced, the transmission ring is driven to rotate, and the second swivel moves toward the first swivel and rotates synchronously through serrated tooth meshing. After the second swivel rotates, it is locked and limited when the two groups of locking blocks contact.

[0007] Preferably, the contact surfaces of the inner walls of the first shell and the second shell with the first rotating ring and the second rotating ring are respectively provided with columnar convex ribs of curved surface bodies.

[0008] Preferably, a flange is integrally provided on the outer wall of the first shell, and is buckled and fixed to the finger pressure plate via the flange.

[0009] Preferably, an extension ring is provided at the end of the second shell separated from the first shell, and a fixing ring threadedly connected to the first shell is sleeved on the outer wall of the extension ring. The extension ring extends beyond the flange on the first shell and the end face of the fixing ring, and pointers and scale lines that match each other are provided on the outer wall of the extension ring and the outer wall of the hollow cylinder.

[0010] Preferably, the spiral body is divided into a variable diameter section and a smooth section along the propulsion direction of the piston shaft. When the piston shaft is fully pushed into the empty cylinder, the spiral body on the part of the piston shaft outside the empty cylinder is the variable diameter section, which increases in diameter along the piston handle toward the other end, and the spiral body of the smooth section has a fixed diameter.

[0011] Preferably, the transmission ring is formed by connecting two half rings with an arbitrary diameter line as a dividing line.

[0012] Preferably, the open end of the hollow cylinder is provided with a diameter expansion cavity

[0013] Preferably, the piston shaft is composed of three groups of spiral bodies, which are evenly spaced and distributed along the circumference.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention provides a structure that can limit the advancement amount of the piston shaft at any position, so that the syringe can perform quantitative injection, thereby forcing the user to develop a good and regular injection habit and avoid habitual injection that causes local subcutaneous nodules and adverse reactions.

[0016] The present invention can adjust the injection volume limit within a certain range by setting the rotation of the second shell and coordinating the scale and the pointer, so that the injection volume can 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 in the present invention only requires plastic and two sets of springs to be completed, and its production cost increases less than that of a traditional syringe, which is conducive to popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0020] Figure 3 for Figure 2 A schematic diagram of the structure of the middle A area;

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

[0022] Figure 5 for Figure 4 A magnified schematic diagram of the structure of the middle B area;

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

[0024] Figure 7 A top view of the end surfaces of the first shell and the second shell on opposite sides;

[0025] Figure 8 It is a schematic diagram of the segmented state of the spiral body;

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

[0027] Fig.10 It is a structural schematic diagram of the expansion cavity;

[0028] Fig.11It is a schematic diagram of an embodiment of the plug-in connection between the half ring bodies of the transmission ring.

[0029] In the figure: 1-empty cylinder; 2-piston shaft; 3-piston handle; 4-finger pressure plate; 5-first shell; 6-second shell; 7-first swivel; 8-second swivel; 9-first reset member; 10-second reset member; 11-transmission ring; 12-spiral body; 13-stop block; 14-convex rib; 15-flange; 16-extension ring; 17-fixing ring; 18-diameter reducing section; 19-smooth section; 20-expansion cavity. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The present invention provides a technical solution: a safe insulin syringe, comprising an empty barrel 1, the empty barrel 1 is the main body of the syringe, one end of which is open, and the other end is connected to a nipple, and the needle is connected through the nipple, the outer wall of the open end of the empty barrel 1 is connected to a finger pressure plate 4, the inner wall of the empty barrel 1 is slidably connected to a piston for sealing, the piston is connected to the end of a piston shaft 2 near the open end of the empty barrel 1 in a detachable manner, and the other end of the piston shaft 2 is fixedly connected to a piston handle 3, and the piston handle 3 is convenient for fingers to push the piston shaft 2;

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

[0033] The first shell 5 is an annular body with at least one step on the inner wall, so as to limit the position of the terminal state of the installation of the second shell 6 and avoid squeezing other parts. The first shell 5 is fixed to the inner wall of the hollow cylinder 1, and is not integrated for easy assembly. The first swivel 7 and the second swivel 8 can rotate freely in the first shell 5 and the second shell 6 respectively. The second reset member 10 between the first swivel 7 and the second swivel 8 is used to generate a repulsive force in the non-propelled state so that the relative surfaces of the two are not in contact. Considering the cost problem, a spring is preferably used. The surfaces on the opposite sides of the first swivel 7 and the second swivel 8 are provided with serrated teeth that can be dislocated and meshed, and can be synchronously rotated in meshing and in a rotation direction. The opposite sides of the first swivel 7 and the second swivel 8 are also provided with annular grooves, which are used to install and limit the position of the second reset member 10.

[0034] The first reset member 9 disposed between the first rotating ring 7 and the opposite side of the first housing 5 is also a small diameter spring in consideration of cost. However, unlike the helical cylindrical spring of the second reset member 10, the first reset member 9 is a planar helical spring that generates a torsion force, thereby being used for the rotation reset of the first rotating ring 7. Both 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 to the transmission ring 11. The transmission ring 11 is provided with a notch groove matched with the spiral body 12. At least one group of spiral bodies 12 is provided so that the transmission ring 11 can be driven to rotate by the spiral when pushed. The outer diameter surface of the spiral body 12 is larger than the outer wall of other radial surfaces at the same axial position of the piston shaft 2 so as not to interfere with the rotation of the transmission ring 11.

[0036] When in use, the operator will first pull the piston shaft 2 to generate negative pressure to absorb the medicine. In the pulling state, because the second swivel 8 is subjected to the pulling force at the end away from the needle in the axial direction (caused by the transmission ring 11), the second swivel 8 and the first swivel 7 are not fitted and synchronized, so only the second swivel 8 rotates. After the medicine is absorbed, the injection is started by pushing the piston handle 3. At this time, because the spiral body 12 on the piston shaft 2 exerts pressure on the transmission ring 11 in the injection direction, the second swivel 8 squeezes the second reset member 10 and fits with the end face of the first swivel 7, and the serrated teeth are engaged. The two rotate synchronously, and the serrated teeth of the two are in the same direction, that is, 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 make the direction of the second swivel 8 opposite. After synchronization, as the injection continues, the first swivel 7 rotates, and the locking block on the first swivel 7 After 13 rotates to abut against the locking block 13 on the second shell 6, the rotation of the second swivel 8 is restricted, so that the piston shaft 2 cannot be advanced, thereby achieving the purpose of quantitative injection. The specific quantitative amount is set by setting the pitch of the spiral body 12 according to the empty cylinder 1 of different diameters, so that each advancement is within the set range, preventing excessive injection at the same position, playing a reminder role, and also forcing the user to develop a regular and standardized injection habit. At the moment of release after the advancement stops (transposition injection), the second swivel 8 is pushed back due to the action of the second reset member 10. Because the driving force is lost, the first swivel 7 is also reset in the opposite direction under the action of the first reset member 9, so that injection can be performed again when the piston shaft 2 is pushed for the second time. That is, the syringe can only inject the set amount each time, and the second or third injection does not require complicated operations, only the piston shaft 2 needs to be pushed again, which is simple and convenient.

[0037] See also Figure 4 and Figure 5 as well as Figure 7 Specifically, 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 surface, that is, the surfaces in contact with the first rotating ring 7 and the second rotating ring 8. The cross section of the ribs 14 is semicircular, so as to reduce the friction of the relative rotation of the contact surfaces. No ribs are required between the first rotating ring 7 and the first housing 5, because the first reset member 9 can play an isolation role.

[0038] As another embodiment, these ribs 14 can also be set on the surface of the first swivel 7 and the second swivel 8, which can at least reduce the contact surface and thus reduce the friction. Since the syringe is a disposable component, these ribs 14 can be set very small without considering reuse after wear.

[0039] See also Figure 2 and Figure 4In order to facilitate the installation and positioning of the first shell 5, a flange 15 is provided. The flange 15 is similar to the finger pressure plate 4 and is connected by snapping the finger pressure plate 4 and the flange 15 together. The snapping method can be fixed by a simple detachable method such as an interference fit between a hole and a shaft, or can be positioned by hole-shaft fit and connected by glue, etc., in a direct fixing method.

[0040] refer to Figure 2 , Figure 4 and Figure 6 In the above-mentioned embodiment, the injection amount can only be quantitatively injected and cannot be adjusted. It cannot be adaptively adjusted for different patients' physical fitness and different blood sugar levels in different time periods. Therefore, the second shell 6 is set to be rotatable to change the initial position of the locking block 13 on the second shell 6, so as to change the maximum rotation angle of the first rotating ring 7 and achieve adjustment;

[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 are in 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 and an external thread are provided on the end face of the fixing ring 17 to the inner wall of the first housing 5. The external thread is fixed with the internal thread of the inner wall of the first housing 5, thereby limiting and locking the second housing 6.

[0042] A scale or a pointer is provided on the second housing 6, and a pointer or a scale is correspondingly provided on the empty cylinder 1, so that the adjustment range can be observed.

[0043] See also Figure 8 and Fig. 9 In order to reduce production costs, the spiral body 12 on the piston shaft 2 is set into two sections, one section has a fixed diameter, that is, a stable state, and the other end is a variable diameter section 18. The variable diameter section 18 is a section starting from one end of the piston handle 3 and increasing in diameter toward the other end until it reaches the smooth section 19. The dividing point between the two sections is the junction of the part of the piston shaft 2 located outside the empty cylinder 1 and the part located inside the empty cylinder 1 when the piston shaft 2 is fully pushed into the empty cylinder 1. 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 put on 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] See also Figure 7 and Fig.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 Fig.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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