Needle cylinder assembly and use method thereof

Abstract

The needle cylinder assembly comprises a needle cylinder, a needle head and a needle head, a single cavity is formed in the needle cylinder, and freeze-dried powder is pre-filled in the single cavity; and the plunger is accommodated in the needle cylinder in a reciprocating motion manner. Wherein the needle cylinder is made of plastic, and a needle is integrally formed on the needle cylinder, and the needle is also made of plastic. The needle cylinder assembly is simple in structure, easy to operate and convenient to recycle.

Description

Technical Field

[0001] This application relates to medical products, specifically to improvements in syringe structure, and particularly to syringes with needles made entirely of plastic. Background Technology

[0002] Syringes with syringes are commonly used products in the medical field, and their uses include storing, injecting, drawing and transferring, and applying medications.

[0003] A syringe consists of a syringe barrel and a needle mounted on the barrel. Currently, there are two main types of syringe structures. One type provides the needle separately from the syringe barrel. During use, the operator attaches the needle to the needle hub of the syringe barrel, for example, through a screw-in or Luer connector. The other type of syringe structure has the needle fixed to the barrel. For example, a metal needle is fixed to the needle hub of the syringe barrel using UV adhesive or similar methods, thus providing the syringe product with the metal needle attached.

[0004] The aforementioned products exhibited some issues during use. For the first type of syringe, the process of connecting the metal needle to the syringe barrel was cumbersome, requiring a high level of operator skill, and posing a risk of drug contamination during the connection process.

[0005] For the second type of syringe, the process of fixing the metal needle to the syringe barrel with UV adhesive is also relatively complex, including steps such as adhesive application, needle loading, UV curing, testing, cleaning, and drying. This installation process requires a dedicated production line, resulting in high production costs. Furthermore, once the metal needle is fixed to the syringe barrel through UV curing, it is difficult to remove the needle from the barrel. Therefore, the used syringe is not suitable for disassembly and reuse, which does not meet the increasingly stringent environmental protection requirements.

[0006] Therefore, there is a need in the art for a syringe structure with an improved structure that is simple in structure, easy to operate, and suitable for recycling and reuse after use, thereby meeting environmental protection requirements. Summary of the Invention

[0007] This application is made to address the problems existing in the prior art described above. The purpose of this application is to provide a syringe assembly with an improved structure, which is simple in structure, easy to operate, and can be easily recycled and reused after use. Furthermore, the needle of this syringe assembly can be properly protected before use.

[0008] This application provides a syringe assembly comprising: a syringe having a single cavity for pre-filling lyophilized powder; and a plunger reciprocally accommodated within the syringe. The syringe is made of plastic, and a needle, also made of plastic, is integrally formed on the syringe.

[0009] In the syringe assembly described above, both the syringe and the needle are made of plastic, allowing them to be integrally formed. Furthermore, the syringe contains a single cavity for pre-filling drugs, such as lyophilized powder. During use, the drug is reconstituted simply by inserting the needle into a container holding the drug solvent. During storage and transportation, the syringe assembly contains only the lyophilized powder, eliminating the risk of contact with the drug solvent and thus preventing moisture absorption. This results in a simple, easy-to-operate, and easily recyclable syringe assembly.

[0010] Furthermore, for structures where the needle is integrally formed on the syringe barrel, the needle is manufactured using the same plastic material as the syringe barrel. For plastic needles, the issue of protecting (and further sealing) the plastic needle tip before use needs to be addressed. Specifically, plastic needles cannot be made as sharp and thin as metal needles, therefore a structure enclosing the plastic needle needs to be designed.

[0011] Therefore, the syringe assembly of this application also includes a protective cap, in which a needle insertion hole is formed, the needle insertion hole being shaped to fit onto the needle to protect the needle, and the needle insertion hole sealing the needle.

[0012] Alternatively, the protective cap may have pre-cut slits or openings, such as cross-shaped or straight slits. The needle of the syringe assembly can easily penetrate these pre-cut slits or openings to form a sealing fit with at least a portion of the protective cap.

[0013] Preferably, the shape of the needle insertion hole is configured to complement the shape of the needle. This allows for a seal between the needle insertion hole and the needle diameter in at least one aspect, including the needle hole, needle tip, and outer peripheral surface of the needle.

[0014] Further preferably, the depth of the needle insertion hole is less than the length of the needle. This allows for an axial seal on the needle. Moreover, the material facing the needle hole can be a deformable material, ensuring that at least a portion of the material is embedded in the needle hole when the needle is fitted into it, thus improving the seal. Alternatively, the inner diameter of the needle insertion hole can be set smaller than the outer diameter of the needle, thereby achieving a radial seal on the needle.

[0015] Preferably, a first directional portion is formed on the end of the syringe where the needle is located and / or on the needle, and a first mating directional portion is formed on the protective cap. The first directional portion and the first mating directional portion can mate with each other to form a first directional mechanism. This first directional mechanism helps to achieve alignment between the needle and the needle insertion hole, which is particularly useful when the shape of the needle is not rotationally symmetrical with respect to its central axis.

[0016] Furthermore, when the needle shape is not rotationally symmetrical, the protective cap and the needle are connected by a snap-fit ​​structure. Specifically, a first snap-fit ​​portion is formed on the outer periphery of the needle, and a second snap-fit ​​portion is formed on the inner surface of the protective cap. The first snap-fit ​​portion can cooperate with the second snap-fit ​​portion to achieve the connection between the protective cap and the needle. In this way, damage to the material inside the protective cap can be avoided due to rotating the protective cap during installation.

[0017] More specifically, one of the first and second latching parts is a convex ring, and the other of the first and second latching parts is a concave ring.

[0018] When the shape of the needle is rotationally symmetrical with respect to its central axis, that is, when the needle tip is formed on the central axis of the needle, a threaded structure can also be used to install the protective cap. Specifically, an external thread is formed on the outer surface of the protective cap, and an internal thread is formed around the needle at the end of the syringe barrel where the needle is located. The external thread can engage with the internal thread, thereby enabling the installation of the protective cap.

[0019] Preferably, a notch is formed on the needle, such that at least a portion of the needle has a C-shaped cross-section. By providing this notch, a flow-guiding effect can be achieved, thereby reducing drug residue on the needle tip after the syringe has been operated on.

[0020] Preferably, the protective cap includes an outer protective cap and an inner protective cap housed within the outer protective cap, wherein the needle insertion hole or pre-cut slit / pre-cut opening is formed in the inner protective cap. The structure of the inner and outer protective caps helps to improve the seal on the needle while ensuring the structural strength of the protective cap; for example, the outer sealing surface can be made of a material with high hardness, while the inner protective cap can be made of a deformable material.

[0021] Preferably, a second directional portion is formed on the inner surface of the outer cap, and a second mating directional portion is formed on the outer surface of the inner cap. The second directional portion can mate with the second mating directional portion to form a second directional mechanism. This second directional mechanism helps ensure that the needle and the needle insertion hole in the inner cap are aligned.

[0022] For the aforementioned syringe assembly, the plastic used to manufacture the syringe and needle as a single unit is a cyclic olefin polymer, such as COP, COC, etc.

[0023] A method of using a syringe assembly is also disclosed, the method comprising: providing the syringe assembly as described above; inserting a needle into a solvent container to draw solvent into a single chamber to dissolve the lyophilized powder and form a drug solution; and connecting the syringe assembly to one of a nasal spray device, a dropper device, a dilution container, or a vial.

[0024] Additionally, if a protective cap is used, the procedure also includes removing the protective cap to expose the needle. Attached Figure Description

[0025] The accompanying drawings illustrate a non-limiting preferred embodiment of the invention, and the features and advantages of the invention become more apparent when viewed in conjunction with the drawings. Wherein:

[0026] Figure 1 A cross-sectional view of a first embodiment of the syringe assembly of this application is shown, wherein the syringe assembly is in an assembled state.

[0027] Figure 2 It shows Figure 1 Another cross-sectional view of the syringe assembly, showing the protective cap separated from the syringe and needle.

[0028] Figure 3 It shows Figure 1 An exemplary structure for a protective cap of a syringe assembly, wherein the protective cap includes an outer protective cap and an inner protective cap.

[0029] Figure 4a An exemplary structure of a needle on a syringe is shown, wherein a notch is provided on the needle.

[0030] Figure 4b It is along Figure 4a The cross-sectional view of the needle taken from line AA in the diagram.

[0031] Figure 5 A cross-sectional view of a second embodiment of the syringe assembly of this application is shown, wherein the syringe assembly is in an assembled state.

[0032] Figure 6 It shows Figure 5 Another cross-sectional view of the syringe assembly, showing the protective cap separated from the syringe and needle.

[0033] Figure 7 Shown in sectional view Figure 5 and 6 The syringe assembly shown is used in a nasal spray device, with the state of the syringe assembly before it is connected to the nasal spray device.

[0034] Figure 8 A cross-sectional view shows the syringe assembly connected to the nasal spray device.

[0035] Figure 9 A cross-sectional view of a third embodiment of the syringe assembly of this application in use is shown.

[0036] Figure 10a It shows the use of Figure 9 A cross-sectional view of the protective cap of the syringe assembly.

[0037] Figure 10b It shows along Figure 10a The view of the protective cap is shown in the direction pointed to by arrow A.

[0038] Figure 10c It shows Figure 10b A magnified view of a portion of the prefabricated cut section.

[0039] (Symbol Explanation)

[0040] 10 Syringe Assembly

[0041] 11 Syringes

[0042] 12 plungers

[0043] 110 needles

[0044] 111 raised ring

[0045] 112 First Orientation Department

[0046] 113. Gap section

[0047] 120 protective helmet

[0048] 121 Concave Ring

[0049] 121 First Coordination and Orientation Department

[0050] 123 Needle socket

[0051] 124 Slope section

[0052] 131 Outer protective cap

[0053] 132 Inner protective cap

[0054] 133 Second Orientation Department

[0055] 134 Second Coordination and Orientation Unit

[0056] 20 Syringe Assembly

[0057] 220 Protective Helmet

[0058] 210 needles

[0059] 211 Protruding shoulder

[0060] 21 Syringes

[0061] 22 Internal thread section

[0062] 221 External thread section

[0063] 223 Needle socket

[0064] 300 Nasal Spray Device

[0065] 311 Nasal spray device body

[0066] 312 Nasal Spray Nozzle

[0067] 313 Connecting sleeve

[0068] 314 Steps

[0069] 30 Syringe Assembly

[0070] 31 Syringes

[0071] 32 plungers

[0072] 310 needles

[0073] 320 Protective Cap

[0074] 321 Pre-fabricated slit (cut)

[0075] 40 vials

[0076] 51 Freeze-dried powder

[0077] 52 Solvent Detailed Implementation

[0078] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments shown in the drawings are merely preferred embodiments of the present invention and do not constitute a limitation on the scope of the present invention. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings. Furthermore, without contradiction, the technical features in the different embodiments described below can be arbitrarily combined with each other, all of which fall within the protection scope of the present invention.

[0079] <First Embodiment>

[0080] Figure 1-4b A syringe assembly 10 and its variants according to a first embodiment of this application are shown. The syringe assembly 10 includes a syringe 11, in which a plunger 12 is housed, the plunger 12 being longitudinally reciprocating within the syringe 11, and defining a single-chamber structure within the syringe 11. This single chamber may be pre-filled with a drug in the form of lyophilized powder.

[0081] As from Figure 1 and 2As seen more clearly, the plunger 12 extends into the syringe 11 from one end (e.g., the lower end in the figure), while a needle 110 is integrally formed on the other end of the syringe 11 (e.g., the upper end in the figure). Here, both the needle 110 and the syringe 11 are made of the same plastic material. The needle 110 is preferably configured to be shorter and smaller in diameter than a conventional metal needle, making it more suitable for pipetting than for applications such as intramuscular injection. For example, the needle 110 is suitable for insertion into a container containing solvent, such as a vial, to draw solution from the container to redissolve a lyophilized powder form of a drug pre-filled into its single chamber into a drug solution.

[0082] The plastic material used to make the needle 110 and the syringe 11 may be, for example, a cyclic olefin polymer, and further, for example, COP, COC, etc.

[0083] In this application, the syringe assembly 10 also includes a protective cap 120. Before using the syringe assembly 10, such as during storage or transportation of the syringe assembly 10, the protective cap 120 is fitted onto the needle 110 to achieve a sealed protection for the needle 110.

[0084] More specifically, a needle insertion hole 123 is formed within the protective cap 120. The needle insertion hole 123 is preferably shaped to be substantially complementary to the shape of the needle 110, so that when the protective cap 120 is installed on the needle 110, the needle 110 can be accommodated in the needle insertion hole 123, and a sealing fit of the needle 110 in the needle insertion hole 123 can be easily achieved.

[0085] The needle insertion port 123 is preferably configured to facilitate the insertion of the needle 110. For example, it can be accessed from... Figure 2 As can be seen more clearly, a ramp 124 is provided at the opening of the needle insertion hole 123, which guides the needle 110 into the needle insertion hole 123.

[0086] Preferably, the depth of the needle insertion hole 123 is set to be less than the length of the needle 110, so that when the protective cap 120 is installed on the needle 110, an axial interference fit is formed between the needle insertion hole 123 and the needle 110, thereby achieving an axial sealing fit between the needle insertion hole 123 and the needle 110.

[0087] Furthermore, the material forming the needle insertion hole 123 in the protective cap 120 can be a material that is at least partially deformable. Thus, when the depth of the needle insertion hole 123 is less than the length of the needle 110, the portion of the needle insertion hole 123 facing the tip of the needle 110 can at least partially sink into the needle hole of the needle 110, thereby further strengthening the axial sealing fit between the needle insertion hole 123 and the needle 110.

[0088] Alternatively, the inner diameter of the needle insertion hole 123 can be set to be smaller than the outer diameter of the needle 110, thereby achieving a radial interference fit between the needle 110 and the protective cap 120, thus achieving a radial seal between the needle 110 and the protective cap 120.

[0089] Regarding the fixing structure between the protective cap 120 and the needle 110, a protruding ring 111 is provided on the outer periphery of the needle 110, and a concave ring 121 is provided on the inner surface of the protective cap 120 corresponding to the protruding ring 111. The protruding ring 111 and the concave ring 121 cooperate with each other, so that the protective cap 120 can be fixedly installed on the needle 110 when it is sleeved onto the needle 110.

[0090] In the exemplary structure shown in the figure, the tip of the needle 110 is offset to one side relative to the axis of the needle 110, for example, formed as a single bevel as shown in the figure. For such a structure of the needle 110, the protective cap 120 is installed on the needle 110 by the cooperation of the convex ring 111 and the concave ring 121, rather than by a threaded connection. This avoids damage to the needle insertion hole 123 in the protective cap 120 due to the relative rotation between the needle 110 and the protective cap 120 during installation.

[0091] In an alternative structure, the positions of the convex ring 111 and the concave ring 121 can also be interchanged, which is also within the scope of this application. That is, the convex ring 111 can be formed on the inner wall of the protective cap 120, and the concave ring 121 can be formed on the outer peripheral surface of the needle 110. In addition, the convex ring 111 does not have to be a continuously extending convex ring 111; it can also be formed as a plurality of protrusions arranged axially along the outer periphery of the needle 110.

[0092] As mentioned above, in Figure 1 and 2 In the exemplary structure shown, the needle 110 is not symmetrical about its central axis, or rather, the tip of the needle 110 is biased to one side. Therefore, in order for the needle 110 to fit correctly into the needle insertion hole 123 of the protective cap 120, an alignment structure is preferably also provided. Specifically, a first directional portion 112 is provided on at least one of the tops of the needle 110 and the syringe 11, the first directional portion 112 being, for example, in the form of a protrusion. Correspondingly, a first mating directional portion 122 is formed on the protective cap 120, the first mating directional portion 122 being, for example, a notch formed on the bottom of the outer wall of the protective cap 120.

[0093] When the protective cap 120 is fitted onto the needle 110, if the first mating orientation part 122 and the first orientation part 112 can be mated together, it means that the protective cap 120 is in the correct orientation relative to the needle 110, thereby ensuring that the needle insertion hole 123 and the needle 110 are correctly matched together.

[0094] In the exemplary structure shown in the figure, the first directional portion 112 is a protrusion formed at the intersection between the needle 110 and the syringe 11. In other embodiments, the first directional portion 112 may also be located in other positions, such as a protrusion formed at any suitable location on the top of the syringe 11, and the protrusion does not necessarily extend to the outer periphery of the needle 110; or, the protrusion may also be formed on the outer periphery of the needle 110 and does not necessarily need to contact the syringe 11. These structures are also within the scope of this application.

[0095] like Figure 3 As shown, in one exemplary structure, the protective cap 120 may include two components: an outer protective cap 131 and an inner protective cap 132 fitted within the outer protective cap 131. A needle insertion hole 123 may be disposed within the inner protective cap 132. Preferably, the outer protective cap 131 and the inner protective cap 132 may be made of different materials. For example, the outer protective cap 131 may be made of a plastic material with high rigidity to improve the structural strength of the protective cap 120 and its resistance to external impacts, thereby better protecting the needle 110 fitted therein. The inner protective cap 132 may be made of a softer material, or the material forming the inner protective cap 132 may be at least partially deformable, thereby helping to improve the sealing fit between the needle insertion hole 123 formed in the inner protective cap 132 and the needle 110.

[0096] exist Figure 1 and 2 In the structure where the needle tip of the needle 110 is eccentrically positioned relative to the central axis of the needle 110, an alignment structure is preferably also provided between the outer cap 131 and the inner cap 132. Specifically, a second directional portion 133, such as a protrusion, is provided on the inner surface of the outer cap 131. Correspondingly, a second mating directional portion 134, such as a notch formed on the outer surface of the inner cap 132, is provided on the outer surface of the inner cap 132. When the inner cap 132 is installed into the outer cap 131, the second directional portion 133 and the second mating directional portion 134 engage to achieve correct positioning of the inner cap 132 relative to the outer cap 131.

[0097] exist Figure 4a and 4b A modified structure of the needle 110 is shown. In this modified structure, a notch 113 is formed on the needle 110. Thus, at least a portion of the cross-section of the needle 110 is C-shaped, as shown... Figure 4b As shown in the diagram. The notch 113 serves to guide the flow, thereby reducing drug residue on the needle after the syringe has been operated on.

[0098] <Second Embodiment>

[0099] Figure 5-8 The syringe assembly 20 of the second embodiment of this application and an exemplary application scenario thereof are illustrated. Unless otherwise described or conflicted, the above description of the first embodiment and the following description of the second embodiment apply to both the first and second embodiments. In the following description, the same structures will not be described in detail again, and the following description will focus more on features not mentioned in the description of the first embodiment.

[0100] like Figure 5 and 6 As shown, in the second embodiment, a needle 210 is formed on one end of the syringe 21 of the syringe assembly 20. The needle 210 is rotationally symmetrical with respect to its central axis, or in other words, the tip of the needle 210 is located on the central axis of the needle 210.

[0101] An internal thread 22 is formed around the setting needle 210 at one end of the syringe 21. An external thread 221 is formed on the outer surface of the protective cap 220, which can engage with the internal thread 22 to achieve the fixed installation of the protective cap 220.

[0102] The protective cap 220 has a needle insertion hole 223 that matches the shape of the needle 210. In this second embodiment, because the needle 210 is shaped such that its tip is located on the central axis of the needle 210, i.e., the needle 210 is rotationally symmetrical, the protective cap 220 will not scratch the material on the inner wall of the needle insertion hole 223 and cause damage to it during the process of rotating the protective cap 220 relative to the needle 210 to fix the protective cap 220 onto the syringe 21 and fit the needle 210 into the needle insertion hole 223.

[0103] Similar to the first embodiment, the depth of the needle insertion hole 223 may be less than the length of the needle 210, thereby achieving an axial interference fit between the needle 210 and the needle insertion hole 223. The inner diameter of the needle insertion hole 223 may also be less than the outer diameter of the needle 210, thereby forming a radial interference fit between the needle 210 and the needle insertion hole 223.

[0104] Figure 7 and 8 An exemplary application scenario of the syringe assembly 20 is shown. The syringe assembly 20 is used to connect to a nasal spray device 300. Specifically, as shown in the figure, the nasal spray device 300 includes a nasal spray device body 311 and a nasal spray nozzle 312 mounted on one end of the nasal spray device body 311. The nasal spray nozzle 312 can be a dual-nozzle type as shown in the figure, or it can be a single-nozzle type; both are within the scope of this application.

[0105] A mating sleeve 313 is formed in the end of the nasal spray device body 311 that connects to the nasal spray head 312. This mating sleeve 313 extends inside the nasal spray device body 311 in a direction opposite to the nasal spray head 312. In use, the operator first removes the protective cap 220 from the needle 210, and then inserts the syringe assembly 20 (with the protective cap 220 removed) into the nasal spray device body 311 until the needle 210 engages with the mating sleeve 313. For example... Figure 8 The assembled state is shown in the image.

[0106] Preferably, as shown in the figure, a stepped portion 314 is formed inside the mating sleeve 313, and a shoulder portion 211 is formed on the outer periphery of the needle 210. The engagement of the stepped portion 314 and the shoulder portion 211 serves as a limiting mechanism to restrict the depth of the needle 210 inserted into the mating sleeve 313, thereby preventing the needle 210 from being excessively inserted into the mating sleeve 313.

[0107] It should be noted that the syringe assembly 10 described in the first embodiment can also be used in... Figure 7 and 8 The application scenario shown is connected to the nasal spray device 300. In addition to the above-described application scenario of connecting to the nasal spray device 300, the syringe assemblies 10 and 20 of this application can also be used in other situations, such as connecting to a dispensing device, a dilution container, a vial, etc.

[0108] <Third Embodiment>

[0109] Figure 9-10c The syringe assembly 30 of the third embodiment of this application and an exemplary application scenario thereof are illustrated. Unless otherwise described or conflicted, the above descriptions of the first and second embodiments and the following descriptions of the third embodiment apply to all three embodiments. In the following description, the same structures will not be described in detail again, and the following description will focus more on features not mentioned in the description of the first embodiment.

[0110] exist Figure 9 As shown, the syringe assembly 30 of the third embodiment includes a syringe 31 and a plunger 32 housed within the syringe 31. Lyophilized powder 51 is contained in a single cavity formed by the plunger 32 and the inner wall of the syringe 31. A needle 32 is integrally formed on the syringe assembly 30. The needle 32 can be inserted into a container such as a vial 40 to draw solvent 52 from the vial 40 into the single cavity of the syringe 31, where it mixes with and dissolves the lyophilized powder 51 to form a drug solution.

[0111] Figures 10a-10cA protective cap 320 for the syringe assembly 30 in the third embodiment is shown. At least one pre-cut slit (or pre-cut opening) 321 is formed in the protective cap 320. The pre-cut slit 321 can be Y-shaped as shown, or it can be cross-shaped, straight, etc. A needle 310 can be inserted into the pre-cut slit 321 and fit tightly with the material of the protective cap 320 to achieve a seal for the needle 310.

[0112] Better, such as Figure 10a As shown, the extension height H of the pre-cut slit 321 in the protective cap 320 can be less than the length of the needle 310. Additionally, as... Figure 10b As shown, the portion of the pre-cut slit 321 may have a circumscribed circle diameter D, which is preferably smaller than the outer diameter of the needle 310. This ensures an interference fit between the needle 310 and the portion of the protective cap 320 with the pre-cut slit 321, thereby improving the sealing effect on the needle 310.

[0113] The various embodiments and variations of the product storage and distribution apparatus of this application have been described in detail above. Those skilled in the art can make various obvious modifications and variations to the structure of the product storage and distribution apparatus of this application based on these embodiments and variations, all of which are within the scope of this application.

Claims

1. A syringe assembly, the syringe assembly comprising: A syringe, wherein the syringe is formed into a single cavity, and the single cavity is used for pre-filling and sealing lyophilized powder; A plunger reciprocally accommodated in the syringe; characterized in that the syringe is made of plastic and a needle is integrally formed on the syringe, wherein the needle is also made of plastic.

2. The syringe assembly as described in claim 1, characterized in that, The syringe assembly also includes a protective cap in which a needle insertion hole is formed. The needle insertion hole is shaped to engage with the needle to protect the needle and to seal the needle.

3. The syringe assembly as described in claim 2, characterized in that, The shape of the needle insertion hole is configured to complement the shape of the needle.

4. The syringe assembly as described in claim 2, characterized in that, The depth of the needle insertion hole is less than the length of the needle; and / or The inner diameter of the needle insertion hole is smaller than the outer diameter of the needle.

5. The syringe assembly as claimed in claim 1, characterized in that, The syringe assembly also includes a protective cap in which a pre-cut slit or pre-cut opening is formed.

6. The syringe assembly as described in claim 2 or 5, characterized in that, A first directional portion is formed on the end of the syringe where the needle is located and / or on the needle, and a first mating directional portion is formed on the protective cap. The first directional portion and the first mating directional portion can cooperate with each other to form a first directional mechanism.

7. The syringe assembly as described in claim 2 or 5, characterized in that, A first latching portion is formed on the outer periphery of the needle, and a second latching portion is formed on the inner surface of the protective cap. The first latching portion can cooperate with the second latching portion to achieve the connection between the protective cap and the needle.

8. The syringe assembly as claimed in claim 7, characterized in that, One of the first and second latching parts is a convex ring, and the other of the first and second latching parts is a concave ring.

9. The syringe assembly as described in claim 2 or 5, characterized in that, The tip of the needle is formed on the central axis of the needle; and The protective cap has an external thread on its outer surface and an internal thread around the needle on the end of the syringe where the needle is located. The external thread can engage with the internal thread to install the protective cap.

10. The syringe assembly as claimed in claim 1, characterized in that, A notch is formed on the needle, such that at least a portion of the needle has a C-shaped cross-section.

11. The syringe assembly as claimed in claim 2, characterized in that, The protective cap includes an outer protective cap and an inner protective cap housed within the outer protective cap, wherein the needle insertion hole is formed in the inner protective cap.

12. The syringe assembly as claimed in claim 5, characterized in that, The protective cap includes an outer cap and an inner cap housed within the outer cap, wherein the pre-cut slit or pre-cut opening is formed in the inner cap.

13. The syringe assembly as claimed in claim 11 or 12, characterized in that, A second directional portion is formed on the inner surface of the outer cap, and a second mating directional portion is formed on the outer surface of the inner cap. The second directional portion can mate with the second mating directional portion to form a second directional mechanism.

14. The syringe assembly as claimed in claim 1, characterized in that, The plastic is a cyclic olefin polymer.

15. A method of using a syringe assembly, characterized in that, The method includes: Provides a syringe assembly as claimed in claim 1; inserts the needle into a solvent container to aspirate solvent into the single chamber to dissolve the lyophilized powder and form a drug solution; and The syringe assembly is connected to one of the following: a nasal spray device, a dropper, a dilution container, or a vial.

16. A method of using a syringe assembly, characterized in that, The method includes: Provide the syringe assembly as described in claim 2; Remove the sealing cap to expose the needle; The needle is inserted into the solvent container to draw solvent into the single chamber, dissolving the lyophilized powder to form a drug solution; and The syringe assembly is connected to one of the following: a nasal spray device, a dropper, a dilution container, or a vial.

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