Syringe with retractable needle head

By designing a retractable syringe, the automatic retraction of the needle is achieved using a baffle and a snap-fit ​​structure, which solves the problem of needles pricking people or objects in existing syringes, thus improving safety and stability.

CN223586346UActive Publication Date: 2025-11-25HUAIAN TESHEN MEDICAL EQUIP CO LTD
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Patent Information

Application Number
CN202422284762.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-19
Publication Date
2025-11-25
Estimated Expiration
2034-09-19

AI Technical Summary

Technical Problem

The needles of existing disposable syringes are prone to pricking people or other objects after use, posing a safety hazard. Furthermore, existing designs with retractable needles or needle protectors have stability issues or are inconvenient to operate.

Method used

Design a needle-retractable syringe. By setting a baffle and a buckle at the lower end of the outer barrel, together with the piston shaft and connecting rod, the needle plug and needle tip can be automatically retracted. Adhesive or interference fit is used to keep them fixed and prevent them from falling off.

Benefits of technology

It effectively avoids the risk of needles pricking people or other objects after use. The structure is simple and can automatically retract after use, improving safety and stability and avoiding the hidden dangers caused by needles falling off.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a syringe with a retractable needle head, which relates to the field of injection equipment and comprises a needle head and a pintle, and the pintle is telescopically connected in a lower end interface of an outer cylinder; the baffle is fixedly connected to the upper end opening of the pintle; the buckle is arranged at the lower end of the piston. The disposable syringe is simple in structure, the pintle and the needle head can be matched and locked through the buckle and the baffle after being used, and finally the pintle and the needle head are pulled back through the piston shaft to be retracted into the outer cylinder, and the phenomenon that the needle head is prone to puncturing people or puncturing other objects is avoided. The protruding part of the upper portion of the pintle is clamped in the groove in the lower end connector of the outer cylinder, the pintle stretches out downwards and is connected with the lower end connector of the outer cylinder in an adhesive or interference fit mode, and therefore although the pintle is telescopically connected with the outer cylinder, the pintle and the needle head cannot be disengaged from the outer cylinder. The situation that the pintle and the needle head fall off to affect use and bring potential safety hazards is avoided, fixation can be kept during normal use, and shaking is prevented.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the field of injection equipment, concretely relates to a retractable syringe. BACKGROUND

[0002] The disposable syringe is generally discarded directly after use. However, the needle of the disposable syringe after being discarded can bring about a safety hazard. After the syringe is discarded, the needle of the disposable syringe can easily be stuck into other objects, resulting in pollution, such as breaking a garbage bag after being discarded into a garbage can.

[0003] At present, there are some disposable syringes with retractable needles and needle protection sleeves. However, the syringes with retractable needles are not stable enough because the needles are easy to move, or the structure is complex and not suitable for disposable syringes. The disposable syringes with needle protection sleeves need to manually put the needle protection sleeve on the needle after use. This process can cause the needle to stick into the user due to personal mistakes, bringing about greater safety hazards. SUMMARY

[0004] Therefore, the utility model aims at providing a retractable syringe to solve the technical problem that the needle of the disposable syringe can easily stick into a user or other objects after use.

[0005] To achieve the above purpose, the utility model provides a retractable syringe, which comprises an outer cylinder and a piston shaft, the front end of the piston shaft is fixedly provided with a piston, the piston is movably connected in the outer cylinder, and the syringe further comprises:

[0006] a needle and a needle plug fixedly connected with the needle, the needle plug is telescopically connected in the lower end interface of the outer cylinder;

[0007] a baffle fixedly connected with the upper port of the needle plug;

[0008] a buckle arranged at the lower end of the piston, the buckle and the baffle are matched to jointly lock the needle plug to pull the needle plug and the needle back into the outer cylinder.

[0009] Further, a connecting rod is arranged in the piston, the upper end of the connecting rod is fixedly connected with the piston shaft, the lower end of the connecting rod extends out of the piston, and the buckle is fixedly connected with the lower end of the connecting rod.

[0010] Further, the baffle and the buckle are both provided with two and are symmetrically arranged, the upper end surface of the buckle is a plane and the lower end surface is an arc surface, and the upper end surface of the baffle is an arc surface and the lower end surface is a plane.

[0011] Further, the needle plug is provided in a "T" shape, a matching groove is arranged at the lower end interface of the outer cylinder, and the upper protruding part of the needle plug is clamped in the groove to prevent the needle plug from extending downward.

[0012] Further, the interface between the needle bolt and the lower end of the outer cylinder can be connected by gluing or interference fit.

[0013] Further, the outer cylinder can be transparent or opaque with the position of the baffle marked on the outer cylinder and the position of the buckle marked on the piston shaft.

[0014] The advantages of the utility model are: 1, the needle bolt and the needle head can be locked by the cooperation of the buckle and the baffle after use, and finally be retracted into the outer cylinder by pulling the piston shaft, avoiding the needle head from easily hurting people or other objects.

[0015] 2, the upper protruding part of the needle bolt is clamped in the groove at the lower end interface of the outer cylinder, and the needle bolt extends downward, so that the needle bolt and the needle head cannot be separated from the outer cylinder, avoiding the needle bolt and the needle head from falling off and affecting use and causing safety hazards.

[0016] 3, the needle bolt and the needle head are connected with the lower end interface of the outer cylinder by gluing or interference fit, which can be fixed during normal use and prevent shaking, and can be smoothly pulled back from the interface after the piston shaft is locked. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is the appearance structure schematic diagram of the utility model.

[0019] Figure 2 It is the internal structure schematic diagram of the utility model.

[0020] Figure 3 It is the structure schematic diagram of the buckle part in the utility model.

[0021] Figure 4 It is the structure schematic diagram of the baffle part in the utility model.

[0022] In the drawing, 101 is the outer cylinder, 102 is the piston shaft, 103 is the needle head, 104 is the piston, 105 is the needle bolt, 106 is the connecting rod, 107 is the buckle, and 108 is the baffle.

[0023] CONCRETE IMPLEMENTING METHOD AND PRINCIPLE

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following further details the utility model with specific examples.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the utility model should be understood as the usual meaning by those skilled in the art to which the utility model belongs. The "first", "second" and similar words used in the utility model do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent the relative positional relationship, which may change accordingly when the absolute position of the described object changes.

[0026] The first aspect of the utility model, as shown in the figure, the main body of the utility model is similar to the conventional disposable syringe, comprising an outer cylinder 101 and a piston shaft 102, the front end of the piston shaft 102 is fixedly provided with a piston 104, the piston 104 is movably connected in the outer cylinder 101, the overall structure is simple, and the use mode is also the same as the existing disposable syringe. Figure 1 As shown in the figure, the difference between the utility model and the existing disposable syringe is that the utility model further comprises a needle 103, the needle 103 is fixedly connected to the lower end of a needle plug 105, the needle plug 105 is telescopically connected to the lower end interface of the outer cylinder 101, and the upper end of the needle plug 105 is fixedly connected with a baffle 108; a buckle 107 is further arranged at the lower end of the piston 104, the buckle 107 cooperates with the baffle 108 to lock the needle plug 105 to pull the needle plug 105 and the needle 103 back into the outer cylinder 101.

[0027] As shown in the figure, the difference between the utility model and the existing disposable syringe is that the utility model further comprises a needle 103, the needle 103 is fixedly connected to the lower end of a needle plug 105, the needle plug 105 is telescopically connected to the lower end interface of the outer cylinder 101, and the upper end of the needle plug 105 is fixedly connected with a baffle 108; a buckle 107 is further arranged at the lower end of the piston 104, the buckle 107 cooperates with the baffle 108 to lock the needle plug 105 to pull the needle plug 105 and the needle 103 back into the outer cylinder 101. Figure 2 As shown in the figure, the difference between the utility model and the existing disposable syringe is that the utility model further comprises a needle 103, the needle 103 is fixedly connected to the lower end of a needle plug 105, the needle plug 105 is telescopically connected to the lower end interface of the outer cylinder 101, and the upper end of the needle plug 105 is fixedly connected with a baffle 108; a buckle 107 is further arranged at the lower end of the piston 104, the buckle 107 cooperates with the baffle 108 to lock the needle plug 105 to pull the needle plug 105 and the needle 103 back into the outer cylinder 101.

[0028] Figure 3 As shown in the figure, the difference between the utility model and the existing disposable syringe is that the utility model further comprises a needle 103, the needle 103 is fixedly connected to the lower end of a needle plug 105, the needle plug 105 is telescopically connected to the lower end interface of the outer cylinder 101, and the upper end of the needle plug 105 is fixedly connected with a baffle 108; a buckle 107 is further arranged at the lower end of the piston 104, the buckle 107 cooperates with the baffle 108 to lock the needle plug 105 to pull the needle plug 105 and the needle 103 back into the outer cylinder 101. Figure 4 As shown in the figure, the difference between the utility model and the existing disposable syringe is that the utility model further comprises a needle 103, the needle 103 is fixedly connected to the lower end of a needle plug 105, the needle plug 105 is telescopically connected to the lower end interface of the outer cylinder 101, and the upper end of the needle plug 105 is fixedly connected with a baffle 108; a buckle 107 is further arranged at the lower end of the piston 104, the buckle 107 cooperates with the baffle 108 to lock the needle plug 105 to pull the needle plug 105 and the needle 103 back into the outer cylinder 101.

[0029] ​Therefore, although the needle plug 105 is telescopically connected to the lower end interface of the outer cylinder 101, the lower end interface of the outer cylinder 101 can limit the needle plug 105 downward, preventing the needle plug 105 and the needle 103 from falling off.

[0030] In addition, the needle plug 105 and the needle tip 103 are connected to the lower end interface of the outer cylinder 101 by adhesive bonding or interference fit, so that they can remain fixed during normal use and prevent shaking.

[0031] It is important to note that if the plunger 105 is connected to the lower interface of the outer cylinder 101 using an interference fit, a tight seal between the plunger 105 and the lower interface of the outer cylinder 101 is necessary to prevent leakage of the medication during injection. Specifically, this can be achieved by attaching a layer of rubber to the outer surface of the plunger 105, or by making the plunger 105 itself from a flexible, elastic material. Therefore, with an interference fit, the plunger 105 and the lower interface of the outer cylinder 101 will be completely sealed, eliminating any gaps and ensuring a proper seal.

[0032] Furthermore, if the needle plug 105 is connected to the lower end interface of the outer cylinder 101 by adhesive bonding, the adhesive connection must not be too tight, so that the needle plug 105 can easily detach from the lower end interface of the outer cylinder 101 under a large external force. This ensures that when the piston shaft 102 is pulled upwards, the connecting rod 106 can smoothly pull the locked needle plug 105 and the needle 103 into the outer cylinder 101 together.

[0033] With the baffle 108 and the latch 107 in place, after the disposable syringe is used (i.e. after injection), the connecting rod 106, along with the latch 107, has already extended into the needle plug 105. Therefore, it is only necessary to rotate the piston shaft 102. The rotation of the piston shaft 102 causes the latch 107 to rotate through the connecting rod 106, so that the latch 107 cooperates with the baffle 108 to lock the needle plug 105. Then, the piston shaft 102 is pulled upward, and the locked needle plug 105 is pulled into the outer cylinder 101 along with the connecting rod 106. Since the needle 103 is fixedly connected to the lower end of the needle plug 105, the needle 103 is also retracted into the outer cylinder 101, realizing the retraction of the needle 103 and preventing the needle 103 from easily pricking people or other objects.

[0034] like Figure 3 As shown, the connecting rod 106 is located inside the piston 104. The upper end of the connecting rod 106 is fixedly connected to the piston shaft 102, and the lower end of the connecting rod 106 extends out from inside the piston 104. The latch 107 is fixedly connected to the lower end of the connecting rod 106. Therefore, the rotation of the piston shaft 102 causes the latch 107 to rotate via the connecting rod 106.

[0035] In addition, the upper end surface of the buckle 107 is flat, the lower end surface is arc-shaped, the upper end surface of the baffle 108 is arc-shaped, the lower end surface is flat, and the outer cylinder 101 is transparent, so that the buckle 107 can be easily inserted into the needle bolt 105 through the gap between the two baffles 108, and then the piston shaft 102 is rotated to the position through the connecting rod 106 with the buckle 107, so that the buckle 107 cooperates with the baffle 108 to lock the needle bolt 105.

[0036] If the outer cylinder 101 must be opaque, the position of the baffle 108 on the outer cylinder 101 is marked, and the position of the buckle 107 on the piston shaft 102 is marked. DETAILED DESCRIPTION

[0037] When the disposable syringe is normally injected, the piston shaft 102 pushes the injection liquid in the original way. After the injection is completed, the piston 104 at the front end of the piston shaft 102 has also reached the bottom of the inside of the outer cylinder 101, and the user can observe the inside through the transparent outer cylinder 101, insert the buckle 107 into the needle bolt 105 through the gap between the two baffles 108, and then rotate the piston shaft 102 to the position through the connecting rod 106 with the buckle 107, so that the buckle 107 cooperates with the baffle 108 to lock the needle bolt 105.

[0038] In addition, the upper end surface of the buckle 107 is flat, the lower end surface is arc-shaped, the upper end surface of the baffle 108 is arc-shaped, the lower end surface is flat, and the outer cylinder 101 is transparent, so that the buckle 107 can be easily inserted into the needle bolt 105 through the gap between the two baffles 108.

[0039] After the buckle 107 cooperates with the baffle 108 to lock the needle bolt 105, the piston shaft 102 is pulled upward, and the locked needle bolt 105 is pulled into the outer cylinder 101 through the connecting rod 106, so that the needle 103 is retracted into the outer cylinder 101, and the needle 103 is retracted to avoid being easily injured or stuck on other objects.

[0040] After the needle 103 is retracted into the outer cylinder 101, the disposable syringe is placed aside or directly discarded, and there is no need to worry about the safety hazard of the needle 103 of the disposable syringe.

[0041] Based on the above, the utility model simple structure, needle bolt 105 and needle head 103 can cooperate and lock through buckle 107 with the baffle 108 after use, finally through the piston shaft 102 back pull and retract into the outer tube 101, avoid the needle head 103 easily hurt people or stick to other objects.Needle bolt 105 upper convex part is clamped in the recess of the lower end interface of outer tube 101, needle bolt 105 extends downward, adopt the mode of adhesive or adopt interference fit and connect with the lower end interface of outer tube 101, therefore needle bolt 105 although with the telescopic connection of outer tube 101, but needle bolt 105 and needle head 103 will not separate from outer tube 101, avoid needle bolt 105 and needle head 103 fall off and bring the security risk and influence use, and can keep fixed during normal use, prevent wobble.

[0042] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to suggest that the scope of the utility model includes only these examples; under the thought of the utility model, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above, which are not provided in details for the sake of simplicity.

[0043] The utility model aims at covering all such alternatives, modifications and variations falling within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A retractable syringe, comprising an outer cylinder (101) and a piston shaft (102), a front end of the piston shaft (102) being fixedly provided with a piston (104), the piston (104) being movably connected in the outer cylinder (101), characterized in that, The syringe further comprises: a needle (103) and a needle plug (105) fixedly connected with the needle (103), the needle plug (105) being telescopically connected in the lower end interface of the outer cylinder (101); a baffle (108) fixedly connected with the upper end of the needle plug (105); a buckle (107) arranged at the lower end of the piston (104), the buckle (107) cooperating with the baffle (108) to jointly lock the needle plug (105) so as to pull the needle plug (105) and the needle (103) back into the outer cylinder (101).

2. A retracting syringe according to claim 1, wherein: A connecting rod (106) is arranged in the piston (104), the upper end of the connecting rod (106) being fixedly connected with the piston shaft (102), and the lower end of the connecting rod (106) extending out of the piston (104), the buckle (107) being fixedly connected with the lower end of the connecting rod (106).

3. A retracting syringe according to claim 1 or 2, wherein: The baffle (108) and the buckle (107) are both provided with two and symmetrically arranged, the upper end surface of the buckle (107) being a plane and the lower end surface being an arc surface, the upper end surface of the baffle (108) being an arc surface and the lower end surface being a plane.

4. A retracting syringe according to claim 1 wherein: The needle plug (105) is provided in a "T" shape, the lower end interface of the outer cylinder (101) being provided with a matching groove, the upper protruding part of the needle plug (105) being clamped in the groove to prevent the needle plug (105) from extending downward.

5. A retracting syringe according to claim 4 wherein: The needle plug (105) and the lower end interface of the outer cylinder (101) can be connected by means of gluing or interference fit.

6. A retracting syringe as defined in claim 1, wherein: The outer cylinder (101) can be transparent or opaque, and the position of the baffle (108) is marked on the outer cylinder (101), and the position of the buckle (107) is marked on the piston shaft (102).