Needle head assembly

Abstract

The utility model provides a needle head assembly which comprises a needle body and a needle seat, a needle holding through hole used for being connected with the needle body in an inserted mode is formed in the needle seat, the needle seat is integrally formed, and the inner side of the needle body is fixed to the needle seat. A taper hole with the narrow inside and the wide outside is formed in the outer end of the needle holding through hole, the needle base is provided with a holding part protruding outwards, and the taper hole is formed in the outer end of the holding part. The needle base is provided with a positioning part arranged around the holding part, and a skin containing cavity is formed between the positioning part and the holding part. According to the utility model, the exposed needle body is provided with a swinging space, and after swinging, the needle body is in surface contact with the side wall of the taper hole, so that the needle body is effectively supported in a larger range, and the possibility of needle breakage is greatly reduced. In addition, due to the arrangement of the positioning part and the skin containing cavity, the relative position of the needle seat and the skin is greatly limited, the swing of the needle body is limited within an extremely small range, and the possibility of needle breakage is further reduced. The needle seat can be formed through one-time injection molding, and the production cost is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a needle assembly. Background Art

[0002] Currently, some syringes need to be used outside of hospitals. Users of these syringes often lack professional training (e.g., for insulin, growth hormone, and beauty hormone injections). Needle assemblies need to be frequently replaced to avoid infection and ensure injection safety. To reduce the difficulty of injection, vertical injections are often used. A vertical injection needle assembly generally consists of a needle hub and a needle body. There are two common ways to connect the needle hub and the needle body:

[0003] 1. Needle holder bonding solution: The needle body is installed in the needle holder, and a glue hole is provided at the connection between the outer end of the needle holder and the needle body (i.e., the root of the exposed part of the needle body). Glue is injected into the glue hole from the outside to bond the needle. The needle body fixed in this way has no room to swing. During puncture, if the needle body tilts, it is easy to break the needle. In addition, this solution requires glue to be dispensed near the needle tip, which is prone to accidental puncture or damage to the needle tip. It is also difficult to accurately control the extension length of the needle used for puncture.

[0004] 2. Insert molding: The needle body is placed in the mold, and the needle seat is molded on the needle body. This method of fixing the needle body also leaves no room for movement, and the needle is also prone to breakage during puncture.

[0005] From the above analysis, it can be seen that, regardless of whether it is a bonding solution or an insert injection molding solution, the root of the exposed needle body and the needle seat are relatively fixed, and the exposed needle body has no room to swing. Since there will be a tingling sensation after the steel needle penetrates the skin, the injected person will instinctively tighten the skin to varying degrees. This process may cause the needle seat and the skin to shift, causing the steel needle to bend or even break at the root of the exposed needle body, causing unnecessary harm to the user. In addition, this type of injection is often performed by untrained personnel, and the needle body is thin, which further leads to frequent needle breakage. And after the needle breaks, there is often no professional personnel to remove the needle in the first time, which greatly increases the pain of the injected person.

[0006] For example, the anti-breakage injection needle disclosed in Chinese utility model CN202221499966.0 adopts an insert injection molding fixation scheme, with a recess provided on the outer end surface of the grip portion to form an annular anti-breakage stop. This limits the bending angle of the needle body when it is bent, thereby achieving the anti-breakage effect. However, this solution has the following disadvantages:

[0007] 1) The stopper makes point contact with the needle body, which is not very effective in preventing breakage. The needle can easily break when the skin is displaced significantly. When injecting growth hormone into children, who are more fearful than adults and have poorer control, their skin can move significantly. This solution increases the chance of the needle breaking, often at the stopper.

[0008] 2) The grip extends toward the inside of the needle holder, placing the needle tail fluid inlet in the middle of the needle holder cavity. This creates a large dead space, causing a large amount of liquid medicine to remain in the dead space, resulting in unnecessary waste. This is especially true for high-value hormone-like liquid medicines, where the resulting loss is particularly significant.

[0009] 3) The entire end face of the base contacts the skin, forming a surface contact. When a child is afraid, the needle seat and the skin will still slide relative to each other with a large displacement, which will cause the needle body to break. The anti-breakage effect is not good.

[0010] 4) When the needle assembly is used for intradermal injection, precise control of the needle's extension is required to accurately inject the medication into the skin. The method used to secure the needle in this utility model makes it difficult to precisely control the needle's extension. Furthermore, adjusting the extension often requires clamping the needle, which can damage the needle tip. Utility Model Content

[0011] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a needle assembly in which the needle seat is integrally formed, the inner part of the needle body is fixed to the needle seat, the exposed root of the needle body has a swinging space, and there is a positioning part and a skin accommodating space between the positioning part and the gripping part. The needle body is not easy to break, the protruding length of the needle body is easy to adjust, the manufacturing is convenient, and the cost is low.

[0012] In order to achieve the above-mentioned purpose and other related purposes, the needle assembly provided by the present invention includes a needle body and a needle seat. The needle seat is provided with a needle holding hole for inserting the needle body. The needle seat is integrally formed, and the inner part of the needle body is fixed to the needle seat; the outer end of the needle holding hole forms a tapered hole that is narrow inside and wide outside, and the needle seat is provided with a gripping portion protruding outward, and the tapered hole is provided at the outer end of the gripping portion; the needle seat has a positioning portion arranged around the gripping portion, and a skin accommodating cavity is formed between the positioning portion and the gripping portion.

[0013] The structure of the present invention, in which the inner side of the needle body is fixed and the outer end of the needle body is provided with a tapered hole, leaves room for the exposed needle body to swing. After swinging, the needle body and the side wall of the tapered hole form surface contact, so that the needle body is effectively supported over a large range, greatly reducing the possibility of needle breakage. In addition, the arrangement of the positioning portion and the skin receiving cavity greatly limits the relative position of the needle seat and the skin, restricting the swing of the needle body to a very small range, further reducing the possibility of needle breakage. In addition, the above-mentioned structural design of the needle seat enables the needle seat to be injection molded in one step, greatly reducing production costs.

[0014] Preferably, the needle holding hole is sequentially arranged from the outside to the inside as a tapered hole, a positioning hole, and a fixing hole. The side wall of the needle seat is provided with a glue injection hole connected to the fixing hole. The needle body is fixed to the needle seat by glue, and the glue is located in the fixing hole and the glue injection hole. This structure can adopt a side dispensing method when fixing the needle body, thereby fixing the inner part of the needle body. In addition, the setting of the positioning hole neither completely fixes the needle body, nor limits its range of movement to a very small space, while the setting of the tapered hole adapts to the swing range of the extended needle body. When the extended needle body swings, the needle body and the side wall of the tapered hole are in contact, so that the needle body is well supported.

[0015] Preferably, the diameter of the positioning hole is slightly larger than the outer diameter of the needle body, and the diameter of the fixing hole is larger than the diameter of the positioning hole. In this way, the needle body is positioned in the fixing hole, positioning hole, and tapered hole from the inside to the outside, and the needle body gradually transitions from fixed to smaller swing to larger swing, greatly reducing the chance of the needle body breaking.

[0016] Preferably, the glue injection hole is a through hole, extending from one side wall of the needle holder to the other. This allows the glue to fully encapsulate the needle body, increasing the reliability of the needle body's fixation. Furthermore, the through hole facilitates side dispensing and observation.

[0017] Preferably, the needle holder has a connecting hole for connecting to a syringe at the end away from the grip, which is connected to the fixing hole. This hole not only allows for connecting the syringe but also facilitates the insertion of a clamp against the needle tail, allowing adjustment of the needle extension without damaging the needle tip. Furthermore, during glue dispensing, the clamp prevents glue from flowing into the connecting hole and affecting the syringe connection.

[0018] Preferably, the connecting hole is connected to the fixing hole through a transition hole, the diameter of the transition hole is no larger than that of the connecting hole, and the diameter gradually decreases from the end near the connecting hole to the end near the fixing hole. In this way, there is almost no dead space in the needle seat, which greatly improves the utilization rate of the liquid medicine.

[0019] Preferably, the needle tail end of the needle body is located in the fixing hole. In this way, almost all the liquid medicine in the syringe can flow into the liquid inlet hole of the needle tail without dead space, which greatly improves the utilization rate of the liquid medicine.

[0020] Preferably, the needle hub forms a cylindrical body surrounding the gripping portion, with the positioning portion formed by the outer end surface of the cylindrical body. This annular positioning portion stabilizes the needle hub against the skin, significantly reducing relative displacement between the needle hub and the skin. Furthermore, the skin within the cylindrical body bulges accordingly, further limiting the needle's swing range and significantly reducing the likelihood of needle breakage.

[0021] Preferably, the portion of the needle holder away from the barrel forms a hand-pinch portion having a diameter smaller than that of the barrel. In this way, when holding the needle assembly, the fingers can be pinched on the hand-pinch portion, away from the needle tip, greatly reducing the possibility of accidental injury by the needle tip.

[0022] Preferably, the taper of the tapered hole is less than or equal to 5. In this way, the swing range of the extended needle body is limited to a very small range, thereby reducing the probability of needle breakage.

[0023] As described above, the needle assembly of the present invention has at least the following beneficial effects:

[0024] 1) The inner portion of the needle tip is fixed, leaving room for the base of the extended needle to swing. The needle seat maintains surface contact with the swung needle, enhancing support effectiveness and significantly reducing the likelihood of needle breakage. Furthermore, the positioning portion and the skin-receiving cavity limit the swing of the extended needle to a relatively small range, further reducing the chance of needle breakage.

[0025] 2) The serial arrangement of the tapered hole, positioning hole, fixing hole, transition hole, and connecting hole in the present invention virtually eliminates dead space within the needle holder, significantly improving the utilization rate of the drug solution. Furthermore, during processing, a fixture can be inserted through the connecting hole, enabling needle tail adjustment. This not only precisely controls the length of the extended needle body to accommodate various extended needle length requirements for intradermal, subcutaneous, and intramuscular injections, but also ensures that the needle tip is not damaged, potentially affecting the puncture effect. Furthermore, this serial arrangement allows the needle body to gradually transition from a small to a large swing range from the inside out, further reducing the chance of needle breakage.

[0026] 3) The structural arrangement of the inner cavity of the needle seat of the present invention enables the integrated injection molding of the needle seat, which greatly reduces the production cost and increases the reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the cross-sectional structure of the present utility model.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model.

[0029] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model from another perspective.

[0030] Figure 4 This is a schematic diagram of the utility model in use.

[0031] Figure 5 It is a partial enlarged structural schematic diagram of the needle body of the utility model when it is bent.

[0032] Figure 6 This is a structural diagram of adjusting the extension length of the needle body during processing of the utility model.

[0033] Description of reference numerals:

[0034] Needle body 1, needle seat 2, needle holding hole 21, tapered hole 211, positioning hole 212, fixing hole 213, gripping part 22, positioning part 23, transition hole 24, connecting hole 25, Luer connector 26, adhesive injection hole 27, hand pinching part 28, skin receiving cavity 29, adhesive 3, push rod 4. DETAILED DESCRIPTION

[0035] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0037] like Figure 1 As shown, the needle assembly provided by the present invention comprises a needle body 1 and a needle seat 2, and the needle seat 2 is integrally injection molded. Figure 1Taking the direction shown as an example, the center of the needle seat 2 is provided with a tapered hole 211, a positioning hole 212, a fixing hole 213, a transition hole 24, and a connecting hole 25 from top to bottom. Among them, the tapered hole 211, the positioning hole 212, and the fixing hole 213 constitute the needle holding hole 21 for inserting the needle body 1. The needle tail of the needle body 1 is located in the fixing hole 213, and its needle tip extends from the tapered hole 211. The extension length is selected accordingly according to needs. The thickness of the human skin layer (epidermis + dermis) is approximately 0.5mm to 3.0mm. Therefore, when the needle assembly is used for intradermal injection, the extension length is controlled within 3mm; when the needle assembly is used for subcutaneous injection or intramuscular injection, the extension length is controlled above 3mm. The specific value can be accurately set according to different usage scenarios.

[0038] The taper of the tapered hole 211 is less than or equal to 5. The tapered hole 211 is narrow inside and wide outside (the "inside" and "outside" in this article are relative to the needle seat 2). Figure 1 In the direction shown, the lower end is narrow, the upper end is wide, and it gradually widens from bottom to top, and the cross section is roughly V-shaped. In this way, when the extended needle body 1 bends (caused by the relative displacement of the needle seat 2 and the skin), as shown in FIG. Figure 5 As shown, the arc surface of the side wall of the tapered hole 211 supports the arc surface of the side wall of the needle body 1, and the two are in surface contact, so that the needle body 1 is effectively supported, thereby effectively reducing the probability of needle breakage.

[0039] like Figure 2 Figure 3 As shown, the side wall of the needle seat 2 is provided with a glue injection hole 27 that communicates with the fixing hole 213. The inner part of the needle body 1 is fixed to the needle seat 2 by glue 3, and the glue 3 is located in the fixing hole 213 and the glue injection hole 27. In this embodiment, the glue injection hole 27 is a through hole, which passes through from one side wall of the needle seat 2 to the other side wall. In this embodiment, when injecting glue 3 from the glue injection hole 27 on one side, it is necessary to seal the glue injection hole 27 on the other side with a plug. Of course, the glue injection hole 27 can also be closed on one side without a plug, thereby facilitating the injection of glue 3. The glue 3 can fill the entire fixing hole 213, or only fill the section where the fixing hole 213 and the glue injection hole 27 intersect. As shown Figure 3 As shown, the glue injection hole 27 can also exist independently of the side wall of the needle seat 2, thereby reducing the amount of material used and ensuring that the wall thickness of the glue injection hole 27 is less affected by the thermal expansion and contraction of the material and is more uniform.

[0040] The diameter of the positioning hole 212 is slightly larger than the outer diameter of the needle body 1, and the diameter of the fixing hole 213 is larger than the diameter of the positioning hole 212. Figure 1The diameter of the tapered hole 211 is the same as that of the positioning hole 212, and the diameter of the tapered hole 211 gradually increases from the inside to the outside. In this way, the needle body 1 transitions from the inside to the outside in the following order: fixed, slightly oscillating, and then more oscillating, with a gradual transition between the three states, thereby effectively reducing the chance of needle breakage.

[0041] by Figure 1 In the illustrated orientation, a connection hole 25 is located at the lower end of the needle hub 2 for connecting a syringe. The syringe tip fits perfectly within the connection hole 25, ensuring a tight seal and minimizing dead space. Furthermore, the needle hub 2 is equipped with a Luer connector 26 at one end of the connection hole 25, further facilitating connection to the syringe.

[0042] The connecting hole 25 communicates with the fixing hole 213 via a transition hole 24. The diameter of the transition hole 24 is no larger than that of the connecting hole 25, and its diameter gradually decreases from the end near the connecting hole 25 to the end near the fixing hole 213. The tail end of the needle body 1 is located within the fixing hole 213. This eliminates dead space within the needle hub 2, allowing nearly all of the liquid in the syringe to be pushed into the liquid inlet at the tail end of the needle.

[0043] like Figure 1 Figure 2 As shown, the needle hub 2 is provided with a gripping portion 22 protruding outward, and a tapered hole 211 is provided at the outer end of the gripping portion 22; the needle hub 2 has a positioning portion 23 provided around the gripping portion 22, and a skin receiving cavity 29 is formed between the positioning portion 23 and the gripping portion 22. Figure 4 As shown, during injection, the positioning portion 23 stabilizes the needle seat 2 on the skin and forces part of the skin to bulge, further limiting the swing range of the needle body 1, thereby effectively reducing the probability of needle breakage.

[0044] like Figure 2 Figure 3 As shown, the needle hub 2 forms a cylindrical body around the grip portion 22, and the positioning portion 23 is formed by the outer end surface of the cylindrical body. Of course, the positioning portion 23 does not necessarily need to be annular as shown in this embodiment; it can also be composed of multiple independent bodies and distributed in an array around the grip portion 22. The portion of the needle hub 2 away from the cylindrical body forms a hand-holding portion 28 with a smaller diameter than the cylindrical body.

[0045] like Figure 6As shown, when the needle body 1 and the needle seat 2 are assembled, the needle seat 2 is first kept in a vertical state, and then the needle tail end of the needle body 1 is placed into the needle holding hole 21 from top to bottom. At this time, the structure of the tapered hole 211, which is wide on the outside and narrow on the inside, can play a guiding role, allowing the needle tail to smoothly enter the positioning hole 212 and reach the fixing hole 213. The push rod 4 can be inserted from the connecting hole 25 in advance, with its end against the needle tail. Then, the push rod 4 is moved up and down, and under the action of gravity, the upper and lower positions of the needle body 1 can be adjusted accordingly, thereby adjusting the extended length of the needle body 1 to a suitable state. Then, glue 3 is injected from the glue injection hole 27 to fix the inner part of the needle body 1. In this process, since it is a needle tail adjustment mode, its needle tip will not be damaged. There is also enough space in the needle seat 2 to adjust the extended length, so there is no need to set the needle seat 2 separately, which increases production costs.

[0046] like Figure 4 As shown, when in use, the upper end of the needle seat 2 is connected to the syringe, and the head of the syringe is located in the connecting hole 25. The end of the barrel of the needle seat 2 is placed vertically against the position to be injected on the human body, and the annular positioning portion 23 firmly holds the skin, and the skin inside the barrel bulges accordingly, and is located in the skin accommodating cavity 29. At this time, the needle tip of the needle body 1 penetrates the position to be injected to inject the liquid medicine. Since the barrel shields the needle tip, the fear of the person being injected can be greatly reduced. At the same time, the positioning portion 23 firmly holds the skin, and the skin in the skin accommodating cavity 29 bulges, further limiting the relative movement of the needle seat 2. Coupled with the anchoring effect of the gripping portion 22 on the skin, the relative displacement of the needle seat 2 and the skin is greatly limited, so that the swing of the needle body 1 is limited to a very small range. In addition, as Figure 5 As shown, even if the needle body 1 swings slightly, the tapered hole 211 and the needle body 1 will still produce arc-surface contact, which can effectively support the needle body 1, thereby greatly reducing the probability of needle breakage.

[0047] In summary, the present invention effectively overcomes the shortcomings of the prior art and has high industrial application value. It is particularly suitable for scenarios where non-professionals inject, such as the injection of growth hormone in children, greatly reducing the pain of children during injection.

[0048] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A needle assembly, comprising a needle body (1) and a needle seat (2), wherein the needle seat (2) is provided with a needle holding hole (21) for inserting the needle body (1), and wherein: The needle seat (2) is integrally formed, and the inner portion of the needle body (1) is fixed to the needle seat (2); the outer end of the needle holding hole (21) forms a tapered hole (211) that is narrow inside and wide outside, and the needle seat (2) is provided with a gripping portion (22) protruding outward, and the tapered hole (211) is provided at the outer end of the gripping portion (22); the needle seat (2) has a positioning portion (23) arranged around the gripping portion (22), and a skin accommodating cavity (29) is formed between the positioning portion (23) and the gripping portion (22).

2. A needle assembly according to claim 1, characterized in that: The needle holding hole (21) is composed of a tapered hole (211), a positioning hole (212), and a fixing hole (213) from the outside to the inside. The side wall of the needle seat (2) is provided with a glue injection hole (27) communicating with the fixing hole (213). The inner part of the needle body (1) is fixed to the needle seat (2) by glue (3), and the glue (3) is located in the fixing hole (213) and the glue injection hole (27).

3. The needle assembly according to claim 2, wherein: The aperture of the positioning hole (212) is slightly larger than the outer diameter of the needle body (1), the aperture of the fixing hole (213) is larger than the aperture of the positioning hole (212), and the inner end aperture of the tapered hole (211) is consistent with the aperture of the positioning hole (212).

4. The needle assembly according to claim 2, wherein: The adhesive injection hole (27) is a through hole, which passes through from one side wall to the other side wall of the needle seat (2).

5. The needle assembly according to claim 2, wherein: The needle seat (2) is provided with a connection hole (25) for connecting a syringe at one end away from the gripping portion (22), and the connection hole (25) is communicated with the fixing hole (213).

6. A needle assembly according to claim 5, characterized in that: The connecting hole (25) is connected to the fixing hole (213) via a transition hole (24); the aperture of the transition hole (24) is no larger than the aperture of the connecting hole (25), and the aperture gradually decreases from an end near the connecting hole (25) to an end near the fixing hole (213).

7. The needle assembly according to claim 5, characterized in that: The needle tail end of the needle body (1) is located in the fixing hole (213).

8. The needle assembly according to claim 1, wherein: The needle seat (2) forms a cylindrical body around the gripping portion (22), and the positioning portion (23) is formed by the outer end surface of the cylindrical body.

9. The needle assembly according to claim 8, wherein: The portion of the needle seat (2) away from the barrel forms a hand-pinch portion (28) having a diameter smaller than that of the barrel.

10. The needle assembly according to claim 1, wherein: The taper of the tapered hole (211) is less than or equal to 5.

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