Dental syringe

Abstract

The utility model discloses a kind of dentistry syringes, including sleeve, base and push rod, the push rod can reciprocate in the base and the sleeve, it is characterized in that, the syringe further includes sealing element, the push rod includes push rod main body and sealing part, the sealing part is located at the bottom end of the push rod main body, and the sealing element is located on the sealing part;The sealing element can be closely attached with the inner wall of injection liquid container, so that the sealing part and injection liquid container inner cavity form sealed space. By the technical scheme, when using the syringe, the rubber plug of injection liquid container can be completed back pull without puncturing, and the problem of difficult drug bottle puncture operation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a dental syringe. Background Technology

[0002] Existing syringes primarily comply with ISO 9997 requirements, with reusable metal syringes being the most widely used. Before using a metal syringe, it must be sterilized. Then, the vial is placed into the metal syringe, and the syringe is pushed forcefully to puncture the rubber stopper on the vial with a barb on the plunger. Finally, the injection needle is installed.

[0003] Patent CN216258591U discloses a anesthetic syringe for dentistry. The syringe includes a barrel and a plunger, with an opening on the side of the barrel to accommodate an injection container. To open the container, a hooked tip is provided at the front of the syringe. This tip pierces the rubber stopper in the container, achieving the injection purpose. In this technology, the hook not only pierces the stopper but also helps the operator pull back the stopper, aiding in aspiration. Patent CN209221197U also discloses a conical connector oral anesthetic bottle delivery device, including a cartridge and a plunger. An inverted conical spike at the bottom of the plunger allows insertion into the rubber stopper at the end of the vial, facilitating the operator's pull-out of the stopper.

[0004] However, the metal syringes used in the aforementioned existing technologies are problematic in several ways. First, they are heavy and require repeated sterilization and reuse, which can lead to user fatigue, increase the risk of cross-infection, and cause corrosion with prolonged use. Second, using a syringe barb to puncture the medicine bottle presents operational difficulties. Furthermore, these existing syringes cannot control the volume of liquid injected. Additionally, the interface between traditional syringes and the injection needle is relatively small, increasing the difficulty of installing the injection needle. Utility Model Content

[0005] To address the difficulties in puncturing medicine vials and controlling the injection volume using existing syringes, this utility model provides the following technical solution:

[0006] A dental syringe includes a sleeve, a base, and a plunger. The plunger is reciprocating within the base and the sleeve. The syringe also includes a seal. The plunger includes a plunger body and a sealing portion. The sealing portion is located at the bottom end of the plunger body, and the seal is located on the sealing portion. The seal can be tightly fitted against the inner wall of an injection container to form a sealed space between the sealing portion and the inner cavity of the injection container.

[0007] Preferably, the syringe further includes a quantitative drug delivery device, which includes a metering structure, a thread and a drug dosage scale, the thread being located on the outer periphery of the plunger body and the drug dosage scale being located on the plunger body.

[0008] Preferably, the syringe further includes a positioning structure, which is sleeved on the push rod body having the threads.

[0009] Preferably, the base includes a base cavity and a base plate that are open at both ends. The base cavity is fixedly disposed in the middle of the base plate, and the push rod can pass through the base cavity and the base plate. The inner diameter of the base cavity is smaller than the outer diameter of the injection container.

[0010] Preferably, the sleeve includes a sleeve cavity, and the two ends of the sleeve cavity are respectively provided with a first connecting end and a second connecting end. The first connecting end is connected to the base plate, and the second connecting end is connected to an external injection needle.

[0011] Preferably, the second connection end is a wide threaded interface.

[0012] Preferably, the top end of the push rod body is provided with a pull-back portion, which is a ring-shaped structure.

[0013] Preferably, the top of the first connecting end is provided with a locking position, and the base plate is provided with a slot that matches the locking position; the slot is provided with a groove structure.

[0014] Preferably, the base plate further includes a handle located below the base plate, and the handle has a through hole to allow the base cavity and the first connecting end to pass through.

[0015] Preferably, the sleeve cavity is made of a transparent material, and a finger support is provided on the outer periphery of the sleeve cavity.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) This application designs a sealing part at the bottom of the plunger and installs a sealing element, so that the base cavity and the sleeve cavity can form a sealed space, thus completing the pull-back without piercing the rubber stopper of the injection container, avoiding the problem of difficult operation when piercing the medicine bottle. 2) This application uses a snap-fit ​​structure to connect the sleeve and the base, which is convenient to connect. 3) This application uses plastic to manufacture the syringe, which reduces costs and avoids the problem of rusting when using metal syringes. At the same time, because plastic is inexpensive to manufacture, this syringe can be used once, reducing the risk of cross-infection for patients. 4) The syringe of this application uses a transparent material to manufacture the sleeve, so that the operator can observe the injection. 5) This application designs a quantitative drug delivery device on the plunger, so that the operator can control the injection volume. The quantitative drug delivery device has the characteristics of simple structure and convenient operation. 6) The second connecting end of the syringe of this application can use a threaded design to facilitate the user to install the injection needle. Attached Figure Description

[0018] Figure 1 A perspective view of the dental syringe of this application;

[0019] Figure 2 for Figure 1 Exploded view of the syringe;

[0020] Figure 3 for Figure 1 A cross-sectional view of the syringe;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 for Figure 1 The base structure diagram of the syringe;

[0023] Figure 6 for Figure 1 A structural diagram showing the first connecting end of the syringe passing through the handle;

[0024] Figure 7 This is a perspective view of the dental syringe with a quantitative drug delivery device according to this application;

[0025] Figure 8 for Figure 7 Exploded view of the syringe;

[0026] Figure 9 for Figure 8 Enlarged view of the structure of the Chinese metrology system;

[0027] Figure 10 for Figure 7 A cross-sectional view of the syringe;

[0028] Figure 11 for Figure 7Front view of the base of the syringe;

[0029] Figure 12 for Figure 7 Reverse view of the base of the syringe. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1:

[0032] like Figures 1-3 As shown, this embodiment provides a dental syringe, including a sleeve 1, a base 2, a plunger 3, and a seal 4; the plunger 3 can reciprocate within the base 2 and the sleeve 1; the seal 4 is located at the bottom end of the plunger 3 so that the plunger 3 can form a sealed space with the injection container 100.

[0033] Specifically, the base 2 includes a base cavity 21 and a base plate 22, both open at both ends. The base plate 22 has a through hole in the middle, allowing the base cavity 21 to be disposed within it. The base plate 22 is fixedly connected to the base cavity 21. The base cavity 21 can be used to guide the push rod 3 inserted therein, reducing the shaking of the push rod 3 during use. The sleeve 1 is also connected to the base plate 22. The sleeve 1 includes a sleeve cavity 11 open at both ends. The push rod 3 can extend into the base cavity 21 and the sleeve cavity 11, and can move back and forth along the base cavity 21 and the sleeve cavity 11. The base plate 22 and the base cavity 21 are preferably integrally formed.

[0034] The push rod 3 includes a push rod body 31, and pull-back portions 32 and sealing portions 33 located at both ends of the push rod body. The sealing portion 33 is located at the bottom end of the push rod body 31; the sealing portion 33 is used to install a sealing element 4, which can make close contact with the inner wall of the injection container 100, thereby forming a sealed space between the push rod 3 and the injection container 100, so that the drug solution in the injection container 100 can be drawn back when the push rod 3 is pulled back. Preferably, the pull-back portion 32 has an overall annular structure to facilitate pushing and pulling.

[0035] The sleeve 1 further includes a first connecting end 12 and a second connecting end 13 respectively located at both ends of the sleeve cavity 11; the first connecting end 12 is connected to the base plate 22, and the second connecting end 13 is connected to the external injection needle. The second connecting end 13 can be designed as a wide interface with a larger diameter or a narrow interface with a smaller diameter to adapt to the installation requirements of different injection needles. Preferably, the second connecting end 13 is a threaded interface; that is, when the syringe is connected to a traditional dental injection needle, the second connecting end 13 is designed as a small-diameter threaded interface; when the syringe is connected to a wide-mouth injection needle, the second connecting end 13 is designed as a matching large-diameter threaded interface. More preferably, the thread in the threaded interface is an external thread.

[0036] Furthermore, the inner diameter of the sleeve cavity 11 is equal to or slightly larger than the outer diameter of the injection container 100, so that the sleeve cavity 11 can accommodate the injection container 100. And the inner diameter of the base cavity 21 is smaller than the outer diameter of the injection container 100, so that the base cavity 21 can fix the injection container 100.

[0037] With the above design, when installing the injection container 100, the injection container 100 can be fixed by having the end of the base cavity 21 abut against the outer periphery of the tail of the injection container 100. Therefore, the syringe of this application can be adapted to injection containers 100 of various lengths simply by adjusting the length of the base cavity 21. Figures 5-6 As shown, when the injection container 100 is long, the base cavity 21 can be shortened, such as... Figures 10-11 As shown, when the injection container 100 is short, the base cavity 21 can be extended.

[0038] In practical use, the injection container 100 is first placed into the sleeve cavity 11 through the first connecting end 12, and then the sleeve 1, push rod 3, and base 2 are assembled. Finally, the syringe of this application is connected to the external injection needle to complete the assembly. After assembly, the operator holds the base 22 and pushes the push rod 3. Under the action of the pushing force, the sealing part 33 pushes the rubber stopper 110 in the injection container forward to allow the injection liquid to flow out. At this time, the sealing part 33 has formed a seal with the injection container 100 through the sealing element 4. Therefore, when it is necessary to pull back, the pull-back part 32 is pulled, and the sealing part 33 moves backward. At this time, a negative pressure is formed in the injection container 100, which causes the rubber stopper 110 in the injection container 100 to retract, thereby achieving the purpose of back suction.

[0039] This technical solution uses a sealing component 4 to form a sealed space with the sleeve cavity 11 and the base cavity 21, achieving back suction through negative pressure. This avoids puncturing the rubber stopper and reduces contamination of the injection solution; at the same time, the back suction structure in this embodiment is simpler and less expensive.

[0040] Example 2:

[0041] The difference between this embodiment and embodiment 1 is that, Figures 2-6 and Figures 10-12 As shown, the base plate 22 and the sleeve 1 are connected by a snap-fit ​​structure.

[0042] Specifically, such as Figures 4-6 As shown, the top end of the first connecting end 12 of the sleeve 1 is provided with a locking position 14; the base plate 22 is provided with a locking groove 23 that matches the locking position 14. In use, simply insert the locking position 14 vertically into the locking groove 23, and then rotate the sleeve 1 to complete the fixing of the sleeve 1 and the base 2. Preferably, as shown... Figures 5-6 As shown, the locking position 14 is a protruding structure located at the port of the sleeve 11, and the locking groove 23 is an arc-shaped locking groove located in the base plate 22. The arc-shaped locking groove has a groove structure that matches the locking position 14. After the locking position 14 is inserted into the locking groove 23, the sleeve 1 is rotated to make the locking position 14 rotate into the groove structure, so that the locking position 14 reaches the locking position, that is, the locking position 14 and the locking groove 23 are engaged, thereby forming a fixed connection between the sleeve 1 and the base 2. When disassembly is required, the sleeve 1 is rotated in the opposite direction, and the locking position 14 leaves the locking groove structure, so that the locking position 14 rotates to the disengaged position. At this time, moving the sleeve 1 and / or the base 2 can separate the sleeve 1 from the base 2.

[0043] like Figures 2-3 As shown, a finger support 15 is provided on the outer periphery of the sleeve cavity 11, and the finger support 15 is close to the first connecting end 12. This design not only provides support for the operator's fingers to facilitate the back suction operation, but also allows the fingers to be placed more comfortably, thereby improving user comfort. The base 2 also includes a handle 24, which has a shape that is easy for the operator to hold, thereby improving the comfort of using the syringe. Preferably, as Figure 10 As shown, the grip 24 is located below the base plate 22; and as... Figure 11 As shown, the grip 24 has a grip through hole 241. The grip through hole 241 allows the base cavity 21 to pass through the grip 24, and also allows the locking slot 14 on the sleeve 1 to pass through the grip 24 and be inserted into the locking slot 23. Furthermore, the grip 241, the base cavity 21, and the base plate 22 are fixedly connected, preferably in an integral molding structure.

[0044] Meanwhile, to reduce the weight of the syringe and minimize cross-infection, the syringe is made of plastic. Furthermore, to facilitate observation of the injection process by the operator, the sleeve 1 is made of transparent material.

[0045] Example 3:

[0046] The difference between this embodiment and embodiment 1 or 2 is that, Figures 7-9As shown, the syringe contains a metering device for administering a quantitative injection to the patient. The metering device includes a metering structure and a positioning structure 34; the metering structure is used to meter the injection solution; the positioning structure is used to limit the displacement of the plunger 3 so that it remains at a position that meets the injection volume requirements.

[0047] Specifically, the metering structure includes a thread 311 and a dosage scale 312; the thread 311 is located on the outer periphery of the push rod body 31; the dosage scale 312 is located on the push rod body 31 and can be calculated based on the parameters of the medicine bottle. The positioning structure 34 is sleeved on the push rod body 31 with the thread 311 and is located between the pull-back part 32 and the base plate 22. By rotating the positioning structure 34 on the push rod body 31, the push rod 3 can be limited. Preferably, the positioning structure 34 can be selected as a nut that matches the thread 311.

[0048] The thread 311 and the push rod body 31 can be formed in one piece, or they can be further processed on the push rod body 31.

[0049] In use, the operator determines the dosage according to the dosage scale 312, then rotates the positioning structure 34 to stop it at the corresponding dosage scale 312, and then the operator pushes the push rod 3. When the base plate 22 comes into contact with the positioning structure 34, the push rod 3 can no longer be pushed forward, and at this time the preset injection volume is reached.

[0050] Furthermore, to facilitate the installation of the positioning structure 34, the pull-back portion 32 and the push rod body 31 are detachable. Preferably, the pull-back portion 32 and the push rod body 31 are threaded together.

[0051] It should be noted that the technical features in embodiments 1 to 3 above can be combined arbitrarily, and the resulting technical solutions all fall within the protection scope of this application. Furthermore, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dental syringe, comprising a sleeve, a base, and a plunger, wherein the plunger is reciprocating within the base and the sleeve, characterized in that, The syringe also includes a seal, and the plunger includes a plunger body and a sealing part. The sealing part is located at the bottom end of the plunger body, and the seal is located on the sealing part. The seal can be tightly attached to the inner wall of the injection container so that the sealing part and the inner cavity of the injection container form a sealed space.

2. The syringe as described in claim 1, characterized in that, The syringe also includes a quantitative drug delivery device, which includes a metering structure, a thread and a drug dosage scale. The thread is located on the outer periphery of the plunger body, and the drug dosage scale is located on the plunger body.

3. The syringe as described in claim 2, characterized in that, The syringe also includes a positioning structure, which is sleeved on the push rod body having the threads.

4. The syringe according to any one of claims 1 to 3, characterized in that, The base includes a base cavity and a base plate, both of which are open at both ends. The base cavity is fixedly disposed in the middle of the base plate. The push rod can pass through the base cavity and the base plate. The inner diameter of the base cavity is smaller than the outer diameter of the injection container.

5. The syringe as described in claim 4, characterized in that, The sleeve includes a sleeve cavity, and a first connecting end and a second connecting end are respectively provided at both ends of the sleeve cavity. The first connecting end is connected to the base plate, and the second connecting end is connected to an external injection needle.

6. The syringe as described in claim 5, characterized in that, The second connection end is a wide threaded interface.

7. The syringe as claimed in claim 5, characterized in that, The top of the push rod body is provided with a pull-back section, which is a ring-shaped structure.

8. The syringe as claimed in claim 5, characterized in that, The top of the first connecting end is provided with a locking position, and the base plate is provided with a slot that matches the locking position; the slot is provided with a groove structure.

9. The syringe as claimed in claim 5, characterized in that, The base plate also includes a handle located below the base plate, and the handle has a through hole to allow the base cavity and the first connecting end to pass through.

10. The syringe as claimed in claim 5, characterized in that, The sleeve cavity is made of transparent material, and a finger support is provided on the outer periphery of the sleeve cavity.

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