A booster for a syringe and a syringe

Abstract

The present application belongs to the technical field of medical devices, and particularly refers to a booster for a syringe and the syringe. The syringe comprises a booster, a needle cylinder and a push rod. The needle cylinder is clamped in the booster, and the push rod is slidably connected to the needle cylinder through the booster. The booster comprises a first shell and a second shell, and the second shell is wrapped outside the first shell. The wall surface of the second shell facing the needle cylinder is provided with an extension part which can pass through the first shell and abut against the needle cylinder to prevent the needle cylinder from rotating. The needle cylinder is pressed by the extension part to prevent the needle cylinder from rotating, thereby preventing the needle from rotating in the skin, avoiding the pain caused by the rotation of the needle, and avoiding the risk of changing the injection position caused by the rotation of the needle. At the same time, the extension part also enhances the connection strength between the first shell and the second shell. In addition, the design of the elastic extension part also realizes the self-adaptation of the extension part to the needle cylinder with different outer diameter errors.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically referring to a syringe booster and a syringe. Background Technology

[0002] Syringes, as the most common and widely used medical devices, are used extensively. They are not only seen in hospital surgical procedures but also in routine outpatient settings. With advancements in technology, they are even used in home medical settings. In any medical procedure, there may be a need for filler injections. However, in some cases, it is crucial to avoid injecting fillers into blood vessels (e.g., insulin injections), as this could lead to fatal medical accidents.

[0003] Therefore, when performing a filler injection, after inserting the needle into the body, the plunger must be pulled back to perform an aspiration operation. If blood is aspirated into the syringe at this time, it proves that the needle is in a blood vessel and the filler injection cannot be performed. This is because injecting the filler into a blood vessel can cause blockage and other complications, potentially leading to a fatal medical accident. Therefore, if blood is drawn during aspiration, the needle insertion site needs to be changed; if no blood is aspirated into the syringe during aspiration, it proves that the needle is not in a blood vessel and the filler injection can be performed.

[0004] While syringes used in filler injections generally have a plunger to prevent vertical, horizontal, and forward / backward movement, a gap typically exists between the plunger and the syringe plunger, making it impossible to prevent syringe rotation. Therefore, during filler injection, both pull-back and injection movements can easily cause slight rotation of the syringe barrel. Since the needle is fixedly connected to the syringe barrel, it will rotate along with the barrel. Furthermore, because needles are generally beveled, even slight rotation can have two negative effects:

[0005] 1. It causes rotation and cutting within the body, resulting in pain for the patient.

[0006] 2. Rotation will change the injection site. For example, the injection site may not originally be located in a blood vessel (see [reference]). Figure 1 This allows for filling injections. However, after rotation, the beveled surface of the needle cuts into nearby blood vessels (see reference). Figure 2 This can cause the injection site to become a blood vessel, making injection impossible. Even more dangerous is that if this is not detected in time and the filler injection is performed, it can lead to serious medical accidents.

[0007] Therefore, the existing technology for filling injections and the boosters used in the syringes pose significant safety hazards and cannot meet the actual needs of filling injections, thus requiring improvement.

[0008] The information disclosed in this background section is only for understanding the background of the inventive concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0009] To address the aforementioned problems or one of the aforementioned problems, the present invention aims to provide a syringe plunger with an extension that can be fitted between a syringe barrel and a plunger, allowing the syringe barrel and the plunger to abut together, thereby effectively preventing the syringe barrel from rotating and reducing pain to the patient. This plunger is simple in structure, practical, and easy to manufacture.

[0010] In view of the above problems or one of the above problems, the second objective of the present invention is to provide a syringe that can effectively solve the technical problems of the syringe barrel easily rotating during filling and injection, causing pain to the patient, and easily changing the injection position, thus posing injection safety hazards; and a syringe that can prevent the syringe barrel from rotating during the injection process.

[0011] To address the aforementioned problems or one of the aforementioned problems, the third objective of this invention is to provide a syringe with an extension between the syringe barrel and the booster, so that the syringe barrel and the booster abut together to form a damping locking structure, thereby effectively preventing the rotation of the syringe barrel and thus effectively preventing the rotation of the injection needle. This avoids the rotation and cutting of the injection needle in the body, reducing the pain caused to the patient. The syringe is simple in structure, practical, and easy to manufacture.

[0012] In view of the above problems or one of the above problems, the fourth objective of the present invention is to provide a syringe booster and syringe that can enhance the structural strength of the booster and adapt to different syringe outer diameter errors.

[0013] To achieve one of the above objectives, the first technical solution of the present invention is as follows:

[0014] A syringe includes a booster, a syringe barrel, and a plunger. One end of the syringe barrel is snapped into the booster, and one end of the plunger passes through the booster and is slidably connected to the syringe barrel. The booster includes a first housing and a second housing, with the second housing covering the outside of the first housing. The wall of the second housing facing the syringe barrel has an extension that can pass through the first housing and abut against the syringe barrel to prevent the syringe barrel from rotating.

[0015] The syringe has an injection needle fixedly connected to its bottom end, and the top end of the syringe is engaged in the plunger. The plunger makes it easier for the fingers to apply force during injection, especially when injecting viscous medications, making it more effortless.

[0016] The second shell covers the outside of the first shell, and an extension begins from the wall of the second shell and extends through the first shell, thus preventing the extension from moving. The extension then abuts against the outer wall of the syringe, holding it in place and preventing its rotation. This, in turn, prevents the needle from rotating and cutting inside the body, reducing pain for the patient. It also avoids the injection risks associated with changes in the injection site.

[0017] During injection, the index and middle fingers hold the plunger, while the thumb presses or pulls back the plunger. At this time, the syringe, which is engaged with the plunger, has a gap between it and the plunger due to manufacturing errors. Therefore, the syringe may slightly rotate during operation. Because the rotational force is small, and the syringe itself is also small, simply pressing the extension against the syringe increases the resistance to its rotation, thus preventing the syringe from rotating and consequently stopping the needle's rotation.

[0018] As a preferred technical measure: a through hole connecting the inside and outside is provided on one side wall of the first housing, and the extension passes through the through hole and abuts against the syringe; the extension and the through hole are interference-fitted. This interference fit not only ensures that the extension will not be driven to rotate by the rotation of the syringe, thus ensuring that the extension can stably prevent the syringe from rotating; at the same time, it also ensures a stable connection between the first and second housings, making them difficult to separate. In contrast, the existing technology does not have a through hole or extension; it simply covers the outside of the first housing with the second housing.

[0019] As a preferred technical measure: the first housing is provided with a first receiving cavity for holding the syringe, the through hole is located on one side of the first receiving cavity, and the other side of the first receiving cavity is provided with a first opening for the syringe to enter and exit;

[0020] The second housing has a second receiving cavity for covering the first housing. The extension is located on one side inside the second receiving cavity and faces the syringe. The other side of the second receiving cavity has a second opening. The first housing and the second housing can be fixedly connected by snap-fit ​​or by secondary injection molding.

[0021] When the second housing covers the outside of the first housing and the first opening and the second opening face the same direction, one end of the extension passes through the through hole into the first receiving cavity and abuts against the syringe.

[0022] The extension abuts against the syringe, thereby holding it in place and preventing it from rotating slightly. Furthermore, the extension passes through a through-hole, and the fit between the extension and the through-hole is a large interference fit. Therefore, the extension not only prevents the syringe from rotating but also increases the connection strength between the first and second housings, achieving a dual technical effect.

[0023] As a preferred technical measure: the extension includes a first section located within the through hole and a second section located within the first receiving cavity; when the extension passes through the through hole, the first section is interference-fitted with the through hole, and the second section abuts against the end face of the syringe facing the syringe. The first and second sections are integrally formed, making production simpler and more convenient.

[0024] Furthermore, the end face of the second section facing the syringe is an arc-shaped surface that fits the outer wall of the syringe. The arc-shaped surface design increases the effective contact area between the second section and the outer wall of the syringe, better wrapping the outer wall of the syringe and thus more effectively preventing the syringe from rotating.

[0025] Or / and: The second segment extends circumferentially to form an extension that covers the first segment. The end face of the extension abuts against the syringe, and the end face of the extension facing away from the syringe abuts against the inner wall of the first receiving cavity. The extension not only further increases the effective contact area between the second segment and the outer wall of the syringe, improving the wrapping effect on the outer wall of the syringe and more effectively preventing the syringe from rotating, but also forms an inverted structure by abutting its end face facing away from the syringe against the inner wall of the first receiving cavity, further increasing the connection strength between the first and second housings.

[0026] As a preferred technical measure: the number of extensions is at least one. Or,

[0027] When there are two or more extensions, the extensions are distributed along the axial or radial direction of the syringe, or simultaneously staggered along both the axial and radial directions. A staggered distribution means that two adjacent extensions are staggered not only along the axial direction of the syringe but also along its radial direction.

[0028] The number of extensions can be adjusted according to actual needs to meet different usage scenarios or design requirements.

[0029] Alternatively, the extension portion is an elastic extension portion, and the second housing is an elastic housing, both integrally molded. Since errors of varying degrees are inevitable in actual production, the elastic extension portion can accommodate syringes with different error levels, creating an adaptive effect. Furthermore, the extension portion inherently prevents syringe rotation and enhances the connection strength between the first and second housings. Therefore, the elastic extension portion achieves a triple technical benefit.

[0030] The second housing is connected to the first housing by bonding, snap-fitting, or secondary injection molding. Different connection methods provide different connection strengths and production costs, allowing for selection based on various practical needs and thus expanding the product's application range.

[0031] Or / and, the booster has a slot for engaging the syringe flange, the height of the opening of the slot is H1, the height of the slot is H2, and H1≤H2.

[0032] When H1 = H2, the slot uses its upper and lower inner walls to clamp the syringe flange, making the connection more stable. Compared with some existing technologies that only clamp a portion of the syringe flange from the inside of the slot, this solution increases the contact area between the slot and the syringe flange, allowing the slot to clamp the syringe flange more tightly, making them less likely to separate. Even with slight collisions, they will not accidentally separate.

[0033] When H1 < H2, slight force is required to slightly open the opening of the slot using the syringe flange, allowing the syringe flange to firmly engage with the slot. Once the syringe flange is fully engaged, the slot opening returns to its original state, confining the syringe flange within the slot. Therefore, when the syringe flange needs to detach from the slot, force is also required. Only when the force reaches a certain level will the slot opening be opened, giving the syringe flange sufficient space to detach. Thus, minor or accidental impacts are insufficient to open the slot opening, preventing easy detachment and maintaining a stable connection, thereby avoiding medical accidents.

[0034] To achieve one of the above objectives, the second technical solution of the present invention is as follows:

[0035] A syringe booster includes a first housing and a second housing, the second housing covering the outside of the first housing and being more flexible than the first housing; the wall of the second housing facing the first housing has an extension that can pass through the first housing and abut against an external syringe to prevent the syringe from rotating.

[0036] To achieve one of the above objectives, the third technical solution of the present invention is as follows:

[0037] A syringe includes a booster with wings and a syringe with a receiving cavity;

[0038] The booster can be partially or completely covered by the syringe;

[0039] The syringe or the booster may be provided with an extension that increases the resistance to the syringe's rotation.

[0040] The extension includes at least an extension extending from the inner wall of the booster to the outer wall of the syringe, which allows the syringe and the booster to abut together to form a damping locking structure.

[0041] Through continuous exploration and experimentation, this invention incorporates an extension between the syringe and the booster, allowing them to effectively abut against each other and form a damping locking structure. This effectively prevents the syringe from rotating, and consequently, also prevents the injection needle from rotating and cutting within the body, reducing pain for the patient. Furthermore, it can adapt to different syringe outer diameter errors, and its simple, practical, and easy-to-manufacture structure makes it suitable for manufacturing.

[0042] As a preferred technical measure:

[0043] One side of the extension is fixed to the syringe or booster, and the other side is provided with an arc-shaped surface, a conical surface, a square surface, a suction cup, or an adhesive surface;

[0044] One end of the extension is directly fixed to the syringe or booster. The extension does not require additional assembly, which can effectively save medical staff's assembly time and improve their work efficiency.

[0045] Alternatively, the side of the extension that contacts the syringe may have an arc-shaped surface, a conical surface, a square surface, a suction cup, an adhesive surface, or a snap-fit ​​structure, and the side that contacts the booster may have a snap-fit ​​structure, an arc-shaped surface, a conical surface, a square surface, a suction cup, or an adhesive surface.

[0046] Or / and, the extension length of the extension is A;

[0047] The gap between the syringe and the booster is B;

[0048] The condition A≥B ensures that the booster and syringe can effectively come into contact.

[0049] As a preferred technical measure:

[0050] The booster has laterally extended wing-shaped sections on both sides, with a through cavity in the middle for threading a syringe.

[0051] The through cavity extends downward to form a fixing cover that encloses the syringe, and the fixing cover has a notch on one side.

[0052] The wing-shaped design facilitates user operation, and the retaining cover allows for easy attachment to the syringe.

[0053] As a preferred technical measure:

[0054] The booster includes a first housing and a second housing, with the second housing covering the outside of the first housing; the extension is fitted onto the wall of the second housing facing the syringe.

[0055] The booster has a double-shell structure, eliminating the need for bolts, nuts, or other fasteners. This allows the booster to be easily fixed to the syringe, facilitating quick assembly of the booster and syringe while also increasing the structural strength of the booster.

[0056] The extension passes through the first housing and abuts against the syringe, thereby preventing the syringe from rotating. This enhances the structural strength of the booster and also adapts to different syringe outer diameter errors.

[0057] The beneficial effects of this invention are:

[0058] Through continuous exploration and experimentation, this invention features an extension that can be fitted between the syringe and the booster, allowing the syringe and the booster to come into contact, thereby effectively preventing the syringe from rotating and reducing pain for the patient. The structure is simple, practical, and easy to manufacture.

[0059] Through continuous exploration and experimentation, this invention features an extension between the syringe and the booster, allowing them to abut against each other and form a damping locking structure. This effectively prevents the syringe from rotating, and consequently, also prevents the injection needle from rotating and cutting inside the body, reducing pain for the patient. The structure is simple, practical, and easy to manufacture.

[0060] Furthermore, this invention uses an extension to hold the syringe in place, thereby preventing the syringe from rotating and consequently preventing the needle from rotating within the skin. This avoids pain caused by needle rotation and also prevents the risk of the injection site changing due to needle rotation. Simultaneously, the extension strengthens the connection between the first and second housings. In addition, the elastic extension design allows it to adapt to syringes with different outer diameter errors. Therefore, the extension achieves three functions in one.

[0061] Furthermore, the present invention covers the outer side of the booster with an elastic material or a relatively soft material, which can reduce finger fatigue caused by prolonged or repeated finger contact and avoid friction damage to the fingers.

[0062] Furthermore, the design of the slot position of the booster in this invention enhances the connection strength between the booster and the syringe, preventing them from easily detaching and avoiding potential medical accidents caused by detachment. Attached Figure Description

[0063] Figure 1 This is a schematic diagram showing the position of the needle relative to the blood vessel when the needle is not located in the blood vessel in the prior art of this invention.

[0064] Figure 2 This is a schematic diagram showing the position of the needle relative to the blood vessel in the prior art of this invention.

[0065] Figure 3 This is a three-dimensional structural diagram of a syringe according to an embodiment of the present invention.

[0066] Figure 4 This is a schematic diagram of the internal structure of a syringe according to an embodiment of the present invention.

[0067] Figure 5 This is a three-dimensional structural diagram of the first housing in an embodiment of the present invention.

[0068] Figure 6 This is a three-dimensional structural diagram of the second housing in an embodiment of the present invention.

[0069] Figure 7 for Figure 6 The first structural diagram is enlarged at point X.

[0070] Figure 8 for Figure 6 The diagram at point X shows a partially enlarged view of the second structural configuration.

[0071] Figure 9 This is a schematic diagram of the structure when the first shell and the second shell are combined in an embodiment of the present invention.

[0072] Figure 10 for Figure 9 A cross-sectional view of the first structure at point AA.

[0073] Figure 11 for Figure 9 A cross-sectional view of the second structure at point AA.

[0074] Explanation of reference numerals in the attached figures:

[0075] 1. Booster; 2. Syringe; 3. Push rod; 50. Needle; 60. Blood vessel; 11. First housing; 12. Second housing; 13. Upper beam; 14. Longitudinal beam; 111. First receiving cavity; 112. First opening; 113. Through hole; 114. Slot; 121. Second receiving cavity; 122. Second opening; 123. Extension; 1231. First section; 1232. Second section; 1233. Extension. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0077] Conversely, this invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the invention as defined in the claims. Furthermore, to provide a better understanding of the invention, certain specific details are described in detail below. However, those skilled in the art will fully understand the invention even without these detailed descriptions.

[0078] It should be noted that when two components are "fixedly connected" or "passed through," the two components can be directly connected or there may be an intermediate component. Conversely, when an component is referred to as being "directly on" another component, there is no intermediate component. The terms "on," "below," "inside," "outside," and similar expressions used in this document are for illustrative purposes only.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0080] Reference Figures 3 to 11 The first specific embodiment of the syringe booster of the present invention:

[0081] A syringe booster with an extension;

[0082] The extension includes at least an extension 123 extending from the inner wall of the booster 1 to the outer wall of the syringe 2. The extension 123 enables the syringe 2 and the booster 1 to abut together to form a damping locking structure.

[0083] One side of the extension is fixed to the syringe 2 or the booster 1, and the other side is provided with an arc-shaped surface, a conical surface, a square surface, a suction cup, or an adhesive surface;

[0084] The extension length of the extension piece is A; the gap between the syringe 2 and the booster 1 is B; A ≥ B.

[0085] A second specific embodiment of the syringe booster of the present invention:

[0086] A syringe booster includes a first housing and a second housing 12, the second housing 12 covering the outside of the first housing and being more flexible than the first housing; the wall of the second housing 12 facing the first housing has an extension 123 that can pass through the first housing and abut against an external syringe 2 to prevent the syringe 2 from rotating.

[0087] A specific embodiment of the syringe of the present invention:

[0088] A syringe includes a booster 1 with wings and a syringe 2 with a receiving cavity; the booster 1 can partially or completely cover the syringe 2; either the syringe 2 or the booster 1 is provided with an extension that can increase the rotational resistance of the syringe 2, and the other is provided with an abutment portion for abutting the extension.

[0089] The extension includes at least an extension 123 extending from the inner wall of the booster 1 to the outer wall of the syringe 2. The extension 123 enables the syringe 2 and the booster 1 to abut together to form a damping locking structure.

[0090] The booster 1 has laterally extended wing-shaped parts on both sides, with a through cavity in the middle for threading the syringe 2.

[0091] The through cavity extends downward to form a fixing cover that covers the syringe 2, and the fixing cover has a notch on one side.

[0092] The present invention has an extension 123 between the syringe 2 and the booster 1, so that the syringe 2 and the booster 1 abut together to form a damping locking structure, which can effectively prevent the syringe 2 from rotating, and thus also effectively prevent the injection needle 50 from rotating and cutting inside the body, reducing the pain caused to the patient. The structure is simple, practical and easy to manufacture.

[0093] Reference Figures 3 to 4 A preferred embodiment of the syringe of the present invention:

[0094] A syringe includes a booster 1, a syringe barrel 2 and a plunger 3. One end of the syringe barrel 2 with a flange, i.e. the top end, is engaged with the booster 1; the other end, i.e. the bottom end, is fixedly connected to an injection needle (not shown in the figure).

[0095] One end of the push rod 3 passes through the booster 1 and is slidably connected inside the syringe 2; the other end protrudes outside the syringe 2 and is provided with a hand for pressing the push rod 3.

[0096] A further design option is to make the end of the hand-facing part curved. This curved design prevents fingers from slipping off the side, avoiding the risk of interrupted operation. This is because if a finger slips off the side, the push rod 3 will rotate slightly, which can easily cause the syringe 2 to rotate as well. Therefore, the curved end of the hand-facing part also helps prevent the syringe 2 from rotating.

[0097] A further advanced solution is to coat the outer surface of the hand with a soft elastomer, such as silicone, rubber, TPE, TPU, or TPV. This soft elastomer can prevent finger fatigue and friction damage caused by prolonged contact.

[0098] The soft rubber elastomer is connected to the handpiece via adhesive bonding, snap-fitting, or secondary injection molding. Different connection methods can meet different production process requirements, thereby satisfying different usage needs and expanding the application range of this product.

[0099] Reference Figures 5 to 6 The booster 1 includes a first housing 11 and a second housing 12, with the second housing 12 covering the outside of the first housing 11. The presence of the booster increases the contact area with the finger, allowing the booster 1 to make it easier for the finger to apply force during injection, especially when injecting viscous medications, thus requiring less effort.

[0100] The first housing 11 includes an upper beam 13 for finger support when the push rod 3 is pressed, and a longitudinal beam 14 perpendicular to the upper beam 13.

[0101] When pulling back the pusher 3 with one hand, use your index and middle fingers to hold the longitudinal beam 14, use the back of your thumb to press against the back of the hand, and then use your thumb to push the hand back, thus achieving the pullback of the pusher 3 with one hand.

[0102] The second housing 12 covers the bottom surface of the upper beam 13 and the outer surface of the longitudinal beam 14; the second housing 12 is connected to the first housing 11 by bonding, snap-fitting, or secondary injection molding. The second housing 12 is made of a soft elastomer.

[0103] The bottom surface of the upper beam 13 and the outer surface of the longitudinal beam 14 are the areas where fingers need to come into contact during the entire operation. Medical staff need to perform this operation repeatedly almost every day. Therefore, covering these finger contact areas with an elastic second shell 12 can greatly reduce finger fatigue of medical staff and friction damage between fingers and booster 1, avoid medical accidents caused by operational fatigue, and solve potential safety hazards.

[0104] The second housing 12 has an extension 123 on its wall facing the syringe 2, which passes through the first housing 11 and abuts against the syringe 2 to prevent the syringe 2 from rotating.

[0105] In a further embodiment, one side wall of the first housing 11 is provided with a through hole 113 connecting the inside and outside, and the extension 123 passes through the through hole 113 and abuts against the syringe 2; the extension 123 and the through hole 113 are interference fit.

[0106] Further solutions,

[0107] The first housing 11 has a first receiving cavity 111 for holding the syringe 2, a through hole 113 is located on one side of the first receiving cavity 111, and a first opening 112 for the syringe 2 to enter and exit is provided on the other side of the first receiving cavity 111.

[0108] The second housing 12 has a second receiving cavity 121 for covering the first housing 11. The extension 123 is located on one side inside the second receiving cavity 121 and faces the syringe 2. The other side of the second receiving cavity 121 has a second opening 122. The first housing 11 and the second housing 12 can be fixedly connected by snap-fit ​​or by secondary injection molding.

[0109] When the second housing 12 covers the outside of the first housing 11 and the first opening 112 and the second opening 122 face the same direction, one end of the extension 123 passes through the through hole 113 and enters the first receiving cavity 111 and abuts against the syringe 2.

[0110] The second housing 12 covers the outside of the first housing 11, and the extension 123 extends from the wall of the second housing 12 and passes through the first housing 11, thus preventing the extension 123 from moving. The extension 123 then abuts against the outer wall of the syringe 2, thus holding the syringe 2 in place and preventing its rotation. This, in turn, prevents the injection needle from rotating and cutting within the skin, reducing pain for the patient. It also avoids the injection risks associated with changes in the injection site. Furthermore, the extension 123 passes through the through hole 113, and the extension 123 and the through hole 113 have a large interference fit. Therefore, the extension 123 not only prevents the syringe 2 from rotating but also increases the connection strength between the first housing 11 and the second housing 12, achieving a dual technical effect.

[0111] Furthermore, the extension 123 is an elastic extension, and the second housing 12 is an elastic housing, both integrally molded. Both the elastic extension and the elastic housing are made of soft elastomers, such as silicone, rubber, TPE, TPU, and TPV.

[0112] In actual production, errors of varying degrees are inevitable. Therefore, the elastic extension can accommodate syringes 2 with different outer diameter errors, creating an adaptive effect. Specifically, when the outer diameter of syringe 2 is slightly larger, the elastic extension deforms more significantly upon contact; conversely, when the outer diameter is slightly smaller, the elastic extension deforms less. Thus, regardless of the outer diameter error of syringe 2, the elastic extension automatically adapts to achieve an optimal contact state. If the extension lacked elasticity, this adaptive effect would not be possible.

[0113] Furthermore, the extension 123 can prevent the syringe 2 from rotating and also enhance the connection strength between the first housing 11 and the second housing 12. Therefore, the elastic extension can achieve three technical effects at once, namely, simultaneously achieving the effects of "preventing the syringe 2 from rotating", "enhancing the connection strength between the first housing 11 and the second housing 12" and "adapting to syringes with various outer diameter errors".

[0114] Reference Figure 7 The extension 123 includes a first section 1231 located within the through hole 113 and a second section 1232 located within the first receiving cavity 111. When the extension 123 passes through the through hole 113, the first section 1231 is in an interference fit with the through hole 113 with a large interference amount; the end face of the second section 1232 facing the syringe 2 abuts against the syringe 2. The first section 1231 and the second section 1232 are integrally formed, making production simpler and more convenient.

[0115] The end face of the second segment 1232 facing the syringe 2 is an arc-shaped surface that fits the outer wall of the syringe 2. The arc-shaped surface design, i.e. Figure 7 and Figure 8 The R marking in the middle, compared with the flat surface, can increase the effective contact area between the second segment 1232 and the outer wall of the syringe 2, better wrapping the outer wall of the syringe 2, and thus more effectively preventing the syringe 2 from rotating.

[0116] or,

[0117] Reference Figure 8 The second segment 1232 extends circumferentially to form an extension 1233 covering the first segment 1231. The end face of the extension 1233 facing the syringe 2 abuts against the syringe 2, and the end face of the extension 1233 facing away from the syringe 2 abuts against the inner wall of the first receiving cavity 111. The extension 1233 not only further increases the effective contact area between the second segment 1232 and the outer wall of the syringe 2, and better enhances the wrapping effect on the outer wall of the syringe 2, thus more effectively preventing the syringe 2 from rotating, but also utilizes its end face facing away from the syringe 2 to abut against the inner wall of the first receiving cavity 111 to form an inverted structure, further increasing the connection strength between the first housing 11 and the second housing 12.

[0118] The number of extensions can be one or more.

[0119] When there are two or more extensions, the extensions can be distributed along the axial direction of the syringe or along the radial direction of the syringe. When distributed radially, the second segment 1232 faces the arc-shaped end face of the syringe 2, and its arc length is less than half the circumference of the outer wall of the syringe 2.

[0120] In addition, several extension parts can also be staggeredly distributed, that is, between adjacent extension parts, they are not only staggeredly distributed along the axial direction of the syringe barrel, but also along the radial direction of the syringe barrel.

[0121] The number of the extension parts 123 can be adjusted according to actual needs to meet different usage scenarios or usage requirements.

[0122] Refer to Figures 9 to 11 , the first accommodating cavity 111 includes a slot 114 for accommodating the flange of the syringe barrel 2; the outer height of the slot 114 is H1, and the inner height is H2, and H1≤H2.

[0123] Refer to Figure 10 , when H1 = H2, the flange of the syringe barrel 2 can be clamped by the upper and lower surfaces of the slot 114 to form a stable connection, making it not easy for the two to separate.

[0124] Refer to Figure 11 , when H1 < H2, the flange of the syringe barrel 2 needs to be pushed in with a little force to be stuck into the slot 114. Similarly, when the flange of the syringe barrel 2 needs to be separated from the slot 114, a little force is also required to separate the two. Therefore, after the flange of the syringe barrel 2 is stuck into the slot 114, even if there is an accidental collision, the two will not separate, which can play a role in preventing separation caused by accidental collision.

[0125] In the existing technical solutions, there is a design with H1 > H2. This design with the outer opening larger than the inner opening, although it is convenient for the flange of the syringe barrel 2 to be stuck into the slot 114. However, since only the inner opening position clamps the flange of the syringe barrel 2 and there is no external anti-separation setting, as long as there is a slight collision or accidental collision, the flange of the syringe barrel 2 is very easy to break away from the slot 114, which is likely to cause medical accidents and there are potential safety hazards.

[0126] When a syringe is assembled and then used, first insert the injection needle fixed to the syringe barrel 2 into the human body, then clamp the longitudinal beam 14 with the index finger and middle finger, and then press the back of the pressing part with the back of the thumb. Then, the thumb presses the pressing part back hard, thereby driving the back-push of the push rod 3, and further realizing the one-handed back-pull of the push rod 3. If blood enters the syringe barrel 2 during the back-pull process, the puncture position of the injection needle needs to be changed, and then the above operations are repeated until no blood is aspirated into the syringe barrel 2 during the back-pull, thereby proving that the filling injection position is not at the blood vessel 60 position.

[0127] Then, support and clamp the booster 1 with the index finger and middle finger and support it on the downward end face of the upper beam 13, and then press the pressing part with the thumb to realize the advancement of the push rod 3, and further fill and inject the drug into the human body.

[0128] Due to unavoidable errors during actual production, the booster 1 can only restrict the up-down, left-right, and forward-backward movement of the syringe 2, but cannot restrict its rotation. Therefore, whether the push rod 3 is pulled back or pushed forward, if the rotation of the syringe 2 is not restricted, the needle will rotate, resulting in rotational cutting within the skin, causing pain to the patient, and potentially altering the injection site, posing a significant safety hazard.

[0129] If the booster 1 is designed to tightly lock the syringe 2 in place, separating the two after use would be very inconvenient. Therefore, using the elastic extension 123 to hold the syringe 2 in place not only prevents the needle on the syringe 2 from rotating, avoiding the safety hazards of pain and injection position changes for the patient, but also facilitates the separation of the booster 1 and the syringe 2 after use. Moreover, the elastic extension 123 also enhances the connection strength between the first housing 11 and the second housing 12, and adapts to the different outer diameter errors of the syringe 2.

[0130] In this application, the fixed connection method can be screwed, glued, riveted, plugged, or connected through a third component. Those skilled in the art can choose according to the actual situation.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A syringe characterized by: The injection device comprises a booster (1), a needle cylinder (2) and a push rod (3), the needle cylinder (2) is connected at one end to the booster (1), the push rod (3) is connected at one end to the needle cylinder (2) through the booster (1), the booster (1) comprises a first shell (11) and a second shell (12), the second shell (12) is wrapped outside the first shell (11); the second shell (12) is provided with an extension (123); one side wall of the first shell (11) is provided with a through hole (113) for communication between the inside and outside, the extension (123) passes through the through hole (113) and abuts against the needle cylinder (2); the extension (123) and the through hole (113) are in interference fit; The first shell (11) is provided with a first accommodating cavity (111) for clamping the needle cylinder (2), the through hole (113) is located on one side of the first accommodating cavity (111), and the first accommodating cavity (111) is provided with a first opening (112) on the other side for the needle cylinder (2) to enter and exit; The first shell further comprises an upper beam for supporting fingers; the second shell (12) is provided with a second accommodating cavity (121) for wrapping the first shell (11), the extension (123) is located on one side inside the second accommodating cavity (121) and faces the needle cylinder (2), and the second accommodating cavity (121) is provided with a second opening (122) on the other side; When the second shell (12) is wrapped outside the first shell (11) and the first opening (112) and the second opening (122) face the same direction, one end of the extension (123) passes through the through hole (113) into the first accommodating cavity (111) and abuts against the needle cylinder (2); the extension (123) comprises a first section (1231) located in the through hole (113) and a second section (1232) located in the first accommodating cavity (111); when the extension (123) passes through the through hole (113), the first section (1231) is in interference fit with the through hole (113), and the end face of the second section (1232) facing the needle cylinder (2) abuts against the needle cylinder (2); The end face of the second section (1232) facing the needle cylinder (2) is an arc surface matched with the outer wall surface of the needle cylinder (2); the second section (1232) extends to the periphery to form an extension (1233) covering the first section (1231) outside, the end face of the extension (1233) facing the needle cylinder (2) abuts against the needle cylinder (2), and the end face of the extension (1233) facing away from the needle cylinder (2) abuts against the inner side wall of the first accommodating cavity (111); The extension (123) is an elastic extension (123); The push rod is provided with a pressing hand portion, and the outer surface of the pressing hand portion is wrapped with a soft rubber elastic body.

2. The injection device according to claim 1, characterized in that: The number of extensions (123) is at least one.

3. The injection device according to claim 1, characterized in that: When the number of extensions (123) is greater than or equal to two, the extensions (123) are distributed along the axial direction or the radial direction of the needle cylinder (2), or are distributed in axial and radial staggered positions.

4. The injection device according to claim 1, characterized in that: The second shell (12) is an elastic shell, and the two are integrally formed; the second shell (12) and the first shell (11) are connected through bonding, clamping or secondary injection molding.

5. The syringe of claim 1, wherein: The booster (1) is provided with a slot (114) for clamping the flange of the needle cylinder (2), the height of the outer opening of the slot (114) is H1, the inner height of the slot (114) is H2, and H1≤H2.

6. A booster for a syringe, characterized by: The first shell (11) and the second shell (12) are included, the second shell (12) is wrapped outside the first shell (11), and the second shell (12) is softer than the first shell (11); a wall surface of the second shell (12) facing the first shell (11) is provided with an extension (123) capable of penetrating the first shell (11) and abutting against the needle cylinder (2) outside to prevent the needle cylinder (2) from rotating; A through hole (113) for communicating the inside and outside is arranged on one side wall surface of the first shell (11), and the extension (123) abuts against the needle cylinder (2) through the through hole (113); the extension (123) and the through hole (113) are in interference fit; The first shell (11) is provided with a first accommodating cavity (111) for clamping the needle cylinder (2), and the through hole (113) is located on one side of the first accommodating cavity (111); the other side of the first accommodating cavity (111) is provided with a first opening (112) for the needle cylinder (2) to enter and exit; The second shell (12) is provided with a second accommodating cavity (121) for wrapping the first shell (11), and the extension (123) is located on one side of the inside of the second accommodating cavity (121) and faces the needle cylinder (2); the other side of the second accommodating cavity (121) is provided with a second opening (122); When the second shell (12) is wrapped outside the first shell (11), and the first opening (112) and the second opening (122) face the same direction, one end of the extension (123) penetrates the through hole (113) into the first accommodating cavity (111) and abuts against the needle cylinder (2); the extension (123) includes a first section (1231) located in the through hole (113) and a second section (1232) located in the first accommodating cavity (111); when the extension (123) penetrates the through hole (113), the first section (1231) is in interference fit with the through hole (113), and the end face of the second section (1232) facing the needle cylinder (2) abuts against the needle cylinder (2); The end face of the second section (1232) facing the needle cylinder (2) is an arc surface matched with the outer wall surface of the needle cylinder (2); the second section (1232) extends to the peripheral side to form an extension (1233) covering the outside of the first section (1231), the end face of the extension (1233) facing the needle cylinder (2) abuts against the needle cylinder (2), and the end face of the extension (1233) away from the needle cylinder (2) abuts against the inner side wall surface of the first accommodating cavity (111); The extension (123) is an elastic extension (123); The push rod is provided with a pressing hand portion, and the outer surface of the pressing hand portion is wrapped with a soft rubber elastomer.

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