Automatic retraction type injector

Abstract

The invention discloses an automatic retraction type syringe, relates to the technical field of syringes, and aims to provide an automatic retraction type syringe which can automatically retract a needle point after use and prevent the needle point from hurting a human body, and the automatic retraction type syringe is technically characterized in that an empty cylinder, a piston handle and a piston block are included, the end face of the empty cylinder is in threaded connection with a pintle, and the pintle is in threaded connection with the piston block; the piston handle is arranged at the bottom of the hollow cylinder, a protective sleeve is arranged on the outer side of the pintle in a sleeving mode, a needle stem is arranged on the inner side of the pintle in a sliding fit mode, and a passive triggering component is connected to the end, located in the pintle, of the needle stem. The technical effects are that through arrangement of the active triggering component, the passive triggering component and the spring, the piston handle is pushed to the bottom of the hollow cylinder, and the active triggering component in the piston handle is clamped with the passive triggering component; then the piston handle continues to be pushed downwards, so that the active triggering component crosses the convex ring, then the active triggering component is bounced upwards under the elastic force action of the spring, the needle stem is stretched into the piston handle, and the problem that the needle stem is exposed and has the risk of hurting people is solved.

Description

Technical Field

[0001] The invention relates to the technical field of syringes, in particular to an automatic retractable syringe. Background Art

[0002] A syringe is a common medical device, consisting of a syringe with a small hole at the front end and a matching piston core rod. The syringe is used to inject a small amount of liquid or gas into or extract it from areas that are inaccessible by other methods. The process of extracting or injecting gas or liquid with a syringe and needle is called injection. In order to protect the patient's personal health, syringes are disposable. The needle of the syringe is very sharp. If it is not handled properly, it is easy to cause the risk of puncture and infection. Traditional syringes require the needle tip to be manually pulled out after use. This process is very risky and can easily cause puncture problems. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies of the prior art, the present invention provides an automatically retractable syringe which can automatically retract the needle tip after use to avoid the needle tip causing harm to the human body.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic retractable syringe, comprising an empty barrel, a piston handle, and a piston block, wherein the end face of the empty barrel is threadedly connected with a needle bolt, the outer side of the needle bolt is provided with a protective sleeve, and the inner side is slidably fitted with a needle stem, one end of the needle stem located in the needle bolt is connected to a passive trigger component, one end of the piston handle located in the empty barrel is clamped with a connecting handle, the other end of the connecting handle is clamped with the piston block, the piston block is fitted with the inner wall of the empty barrel, an active trigger component is provided in the piston handle, a spring is provided on the outer side of the active trigger component, the spring applies thrust to the active trigger component, the active trigger component is used to connect the passive trigger component, a convex ring clamped with the active trigger component is also provided in the piston handle, and a handle cover is clamped on the top of the piston handle.

[0007] Preferably, the passive trigger component includes a connecting rod, which is connected to the needle stem and is hollow. The top of the connecting rod is provided with a hanging point that is engaged with the active trigger component. The size of the connecting rod is smaller than the hanging point, and the size of the hanging point is smaller than the inner hole of the active trigger component.

[0008] Preferably, the active trigger component includes a trigger rod, which is slidably fitted in the piston handle and has a hollow interior. The top of the trigger rod is provided with a top ring that fits with the convex ring, and the bottom is provided with a hanging ring that is clamped with the hanging point.

[0009] Preferably, the piston handle comprises an upper handle body and a lower handle body, the lower handle body is cooperatively connected with the connecting handle and the active trigger component, a breakable breaking point is provided between the upper handle body and the lower handle body, the top end inside the upper handle body is provided with a fixing component that can be clamped with the passive trigger component, and a handle cover is inserted into the top end of the upper handle body.

[0010] Preferably, the fixing component comprises a boss opened in the upper handle body, the boss is provided with a plurality of upwardly inclined clamping strips, the clamping strips are elastic, and a clamping block for fixing the position of the clamping strips is opened inside the upper handle body.

[0011] Preferably, an ejection component is provided inside the handle cover, and the ejection component is used to push the passive trigger component to separate from the fixed component. The ejection component includes a push rod, and the push rod is slidably matched with the handle cover. A pressing piece slidably matched with the handle cover is provided under the push rod.

[0012] Preferably, a rubber ring is provided between the pintle and the passive trigger component, a rubber tube is provided under the rubber ring, and the rubber tube is fitted between the passive trigger component and the inner wall of the pintle.

[0013] Preferably, a weak sealing gasket is provided under the piston block at a position aligned with the active trigger component, and the weak sealing gasket is used to prevent the drug solution from entering the piston handle.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the present invention provides an automatic retractable syringe, which has the following beneficial effects:

[0016] 1. By setting an active trigger component, a passive trigger component and a spring, the active trigger component is restricted by the convex ring in the piston handle under normal conditions, so that the active trigger drives the spring in a potential energy compression state. When the syringe is used up, the piston handle is pushed to the bottom of the empty cylinder, so that the active trigger component in the piston handle is engaged with the passive trigger component, and then the piston handle is pushed downward continuously, so that the active trigger component is subjected to an upward reaction force, so that the active trigger component passes over the convex ring and loses the fixing effect, and then the active trigger component is bounced upward under the elastic force of the spring, and the active trigger component stretches the needle stem into the piston handle by engaging with the passive trigger component, so that the needle stem is retracted in time after use, and the problem of the needle stem being exposed and causing the risk of injury is avoided.

[0017] 2. By setting a fixing component and an ejecting component, the fixing component is inside the upper handle body. When the active trigger component pulls the passive trigger component upward under the action of the spring, the passive trigger component will be subjected to the same pulling force, causing the passive trigger component to bounce upward and squeeze the fixing component, so that the fixing component fixes it at the end of the upper handle body, thereby preventing the passive trigger component and the needle stem from sliding randomly;

[0018] When collecting and processing syringes, the metal needle stem needs to be separated from the main body of the syringe, and the upper handle body and the lower handle body are connected by a breaking point so that the two can be broken off. The broken upper handle body is connected to the passive trigger component and the needle stem through a fixing component, so that it can be taken out without touching the needle stem, and then the passive trigger component and the needle stem are ejected by the ejection component and fall into a special recovery device, which is convenient for taking out the needle stem separately during classification processing without touching it. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 A schematic diagram of a cross section of the present invention;

[0021] Figure 3 is a schematic diagram of a cross section of a piston handle of the present invention;

[0022] Figure 4 A schematic diagram of a cross section of an active trigger component of the present invention;

[0023] Figure 5 Schematic diagram of the cross section of the passive trigger component of the present invention

[0024] Figure 6 A schematic diagram of a cross section of an ejection component of the present invention;

[0025] Figure 7 For the present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0026] Figure 8 For the present invention Figure 2 Schematic diagram of the enlarged view at B.

[0027] In the figure: 1. empty cylinder; 2. piston handle; 201. upper handle body; 202. lower handle body; 203. breaking point; 204. fixing component; 2041. clamping strip; 2042. boss; 2043. clamping block; 205. handle cover; 3. protective cover; 4. ejection component; 401. ejector rod; 402. pressing piece; 5. active trigger component; 501. trigger rod; 502. top ring; 503. hanging ring; 6. spring; 7. passive trigger component; 701. connecting rod; 702. hanging point; 8. needle bolt; 9. piston block; 10. connecting handle; 11. needle stem; 12. rubber ring; 13. rubber tube; 14. convex ring; 15. weak sealing gasket. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] See also Figure 1-8 , an automatic retractable syringe, comprising an empty barrel 1, a piston handle 2, and a piston block 9, the end surface of the empty barrel 1 is threadedly connected with a needle bolt 8, the outer side of the needle bolt 8 is sleeved with a protective sleeve 3, and the inner side is slidably matched with a needle stem 11, and the end of the needle stem 11 located in the needle bolt 8 is connected with a passive trigger component 7, the end of the piston handle 2 located in the empty barrel 1 is clamped with a connecting handle 10, and the other end of the connecting handle 10 is clamped with the piston block 9, and the piston block 9 is in contact with the inner wall of the empty barrel 1, and an active trigger component 5 is arranged in the piston handle 2, and a spring 6 is arranged on the outer side of the active trigger component 5, and the spring 6 applies a thrust to the active trigger component 5, and the active trigger component 5 is used to connect the passive trigger component 7, and a convex ring 14 clamping the active trigger component 5 is also arranged in the piston handle 2;

[0031] In the present invention, an active trigger component 5, a passive trigger component 7 and a spring 6 are provided. Under normal conditions, the active trigger component 5 is restricted by the convex ring 14 in the piston handle 2, so that the active trigger drives the spring 6 to be in a potential energy compression state. When the syringe is used up, the piston handle 2 is pushed to the bottom of the empty cylinder 1, so that the active trigger component 5 in the piston handle 2 is engaged with the passive trigger component 7, and then the piston handle 2 is continued to be pushed downward, so that the active trigger component 5 is subjected to an upward reaction force, so that the active trigger component 5 passes over the convex ring 14 and loses the fixing effect, and then the active trigger component 5 is bounced upward under the elastic force of the spring 6, and the active trigger component 5 stretches the needle stem 11 into the piston handle 2 by engaging with the passive trigger component 7, so that the needle stem 11 is retracted in time after use, and the problem of the needle stem 11 being exposed and injuring people is avoided.

[0032] The passive trigger component 7 includes a connecting rod 701, which is connected to the needle stem 11 and is hollow. The top of the connecting rod 701 is provided with a hanging point 702 that is engaged with the active trigger component 5. The size of the connecting rod 701 is smaller than the hanging point 702, and the size of the hanging point 702 is smaller than the inner hole of the active trigger component 5. The active trigger component 5 includes a trigger rod 501, which is slidably fitted in the piston handle 2 and is hollow inside. The top of the trigger rod 501 is provided with a top ring 502 that fits the convex ring 14, and the bottom is provided with a hanging ring 503 that is engaged with the hanging point 702.

[0033] When the piston handle 2 is pushed downward continuously, the top of the trigger rod 501 in the piston handle 2 uses the top ring 502 to contact the convex ring 14, and drives the hanging ring 503 at the bottom to move downward. The hanging ring 503 squeezes the hanging point 702 at the top of the connecting rod 701 downward and engages with it. Then, under the continuous downward pressure, the trigger rod 501 is subjected to an upward reaction force, so that the top ring 502 at the top passes over the convex ring 14 under the pressure. At this time, the trigger rod 501 is fixed under the top of the spring 6 and bounces up, and uses the hanging ring 503 at the bottom to drive the hanging point 702 and the connecting rod 701 to pull the needle stem 11 into the piston handle 2, thereby achieving the purpose of retracting the needle stem 11.

[0034] Example 2

[0035] refer to Figure 3 , 5 , 6, 7, 8, the specific piston handle 2 includes an upper handle body 201 and a lower handle body 202, the lower handle body 202 is connected with the connecting handle 10 and the active trigger component 5, a break point 203 that can be broken off is provided between the upper handle body 201 and the lower handle body 202, a fixing component 204 that can be clamped with the passive trigger component 7 is provided at the top end of the upper handle body 201, and a handle cover 205 is inserted at the top end of the upper handle body 201;

[0036] In the present invention, a fixing component 204 is utilized, and the fixing component 204 is inside the upper handle body 201. When the active trigger component 5 pulls the passive trigger component 7 upward under the action of the spring 6, the passive trigger component 7 will be subjected to the same pulling force, causing the passive trigger component 7 to bounce upward and squeeze the fixing component 204, so that the fixing component 204 fixes it at the end of the upper handle body 201, thereby preventing the passive trigger component 7 and the needle stem 11 from sliding freely.

[0037] The fixing member 204 includes a boss 2042 provided in the upper handle body 201, and a plurality of upwardly inclined clips 2041 are provided on the boss 2042. The clips 2041 are elastic, and a clip block 2043 for fixing the clips 2041 is provided inside the upper handle body 201;

[0038] By setting the clamping strip 2041 and the clamping block 2043, during assembly, the clamping strip 2041 is first placed in the upper handle body 201 and then pressed inward so that the clamping strip 2041 fits on the boss 2042 and is restricted by the clamping block 2043. In this way, the clamping strip 2041 and the piston handle 2 can be injection molded separately, thereby reducing the mold opening cost and the difficulty of demolding. When the active trigger component 5 drives the needle stem 11 to bounce up through the passive trigger component 7, the active trigger component 5 is blocked by the clamping strip 2041, and the hanging point 702 in the passive trigger component 7 will squeeze the clamping strip 2041 open and then be clamped on the clamping strip 2041, thereby achieving the effect of fixing the needle stem 11 and preventing it from shaking at will.

[0039] The handle cover 205 is provided with an ejection component 4, which is used to push the passive trigger component 7 to separate from the fixed component 204. The ejection component 4 includes an ejector rod 401, which is slidably matched with the handle cover 205, and a pressing piece 402 is provided under the ejector rod 401 to be slidably matched with the handle cover 205.

[0040] When collecting and processing syringes, the metal needle stem 11 needs to be separated from the main body of the syringe, and the upper handle body 201 and the lower handle body 202 are connected by the breaking point 203 so that the two can be broken off. The broken upper handle body 201 is connected to the passive trigger component 7 and the needle stem 11 through the fixing component 204, and the needle stem 11 can be taken out without contacting it, and then the passive trigger component 7 and the needle stem 11 are pushed out by the ejection component 4, so that they fall into a dedicated recovery device, which is convenient for taking out the needle stem 11 separately during classification processing without contacting it;

[0041] Under normal circumstances, the push rod 401 is retracted into the handle cover 205. When it is necessary to separate the passive trigger component 7 from the needle stem 11 through the ejection component 4, the push rod 401 can be pushed by a tool to push the passive trigger component 7 to separate from the fixing component 204, thereby achieving the purpose of collecting the needle stem 11 without contacting it.

[0042] A rubber ring 12 is provided between the pintle 8 and the passive trigger component 7, a rubber tube 13 is provided under the rubber ring 12, and the rubber tube 13 is attached between the passive trigger component 7 and the inner wall of the pintle 8;

[0043] By setting the rubber ring 12, a seal can be formed between the needle plug 8 and the passive trigger component 7, so that the two have a reliable sealing effect to prevent leakage. When the passive trigger is pulled into the piston handle 2 and contracted, the passive trigger component 7 will use the friction force to roll the rubber tube 13 inward in contact with it, so that the rubber tube 13 is turned into the needle plug 8, and the problem of residual liquid flowing out of the syringe is reduced by folding.

[0044] A weak sealing gasket 15 is provided at a position aligned with the active trigger component 5 under the piston block 9, and the weak sealing gasket 15 is used to prevent the liquid medicine from entering the piston handle 2;

[0045] By setting a weak sealing gasket 15, the weak sealing gasket 15 is normally in a state of closing the central hole of the piston block 9, so that it can smoothly inhale and push out the drug solution and prevent the drug solution from entering the piston handle 2. When the active trigger component 5 and the passive trigger component 7 are connected, the weak sealing gasket 15 will be broken, so that the channel for the needle stem 11 to retract is opened.

[0046] Working principle:

[0047] When the needle stem 11 needs to be retracted, the piston handle 2 is continuously pushed into the empty cylinder 1, so that the trigger rod 501 in the piston handle 2 is engaged with the hanging point 702 through the hanging ring 503 at the bottom, and then the push is continued, so that the top ring 502 at the top of the trigger rod 501 is separated from the convex ring 14, and then the spring 6 releases its own elastic force to bounce the trigger rod 501 upward, so that the trigger rod 501 drives the connecting rod 701 and the needle stem 11 to bounce upward, so that the needle stem 11 is received in the piston handle 2, and the connecting rod 701 and the needle stem 11 are engaged with the clamping strip 2041 through the hanging point 702 under the push of the elastic force, so that the connecting rod 701 and the needle stem 11 are fixed;

[0048] When the needle stem 11 needs to be separated, the upper handle body 201 and the lower handle body 202 are broken off, and the upper handle body 201 uses the internal clamping strip 2041 to take out the connecting rod 701 together with the needle stem 11, and then the needle stem 11 is placed in a collecting device, and at the same time, a tool is used to push the top rod 401 downward, so that the top rod 401 pushes the connecting rod 701 together with the hanging point 702, separating it from the clamping strip 2041, and causing the needle stem 11 to fall into the collecting device.

[0049] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. An automatic retractable syringe, comprising an empty barrel (1), a piston handle (2), and a piston block (9), characterized in that: The end surface of the hollow cylinder (1) is threadedly connected with a pintle (8), the outer side of the pintle (8) is sleeved with a protective sleeve (3), and the inner side is slidably fitted with a pintle (11), one end of the pintle (11) located in the pintle (8) is connected with a passive trigger component (7), one end of the piston handle (2) located in the hollow cylinder (1) is clamped with a connecting handle (10), the other end of the connecting handle (10) is clamped with a piston block (9), and the piston block (9) is in contact with the inner wall of the hollow cylinder (1), an active trigger component (5) is arranged in the piston handle (2), a spring (6) is arranged on the outer side of the active trigger component (5), and the spring (6) applies a thrust to the active trigger component (5), and the active trigger component (5) is used to connect the passive trigger component (7), a convex ring (14) for clamping the active trigger component (5) is also arranged in the piston handle (2), and a handle cover (205) is clamped at the top end of the piston handle (2).

2. An automatic retractable syringe according to claim 1, characterized in that: The passive trigger component (7) comprises a connecting rod (701), which is connected to the needle stem (11) and is hollow. The top of the connecting rod (701) is provided with a hanging point (702) which is engaged with the active trigger component (5). The size of the connecting rod (701) is smaller than that of the hanging point (702), and the size of the hanging point (702) is smaller than the inner hole of the active trigger component (5).

3. An automatic retractable syringe according to claim 2, characterized in that: The active trigger component (5) comprises a trigger rod (501) which is slidably fitted in the piston handle (2) and is hollow inside. The top of the trigger rod (501) is provided with a top ring (502) which fits with the convex ring (14), and the bottom is provided with a hanging ring (503) which is clamped with the hanging point (702).

4. An automatic retractable syringe according to claim 1, characterized in that: The piston handle (2) comprises an upper handle body (201) and a lower handle body (202); the lower handle body (202) is cooperatively connected with the connecting handle (10) and the active trigger component (5); a break point (203) that can be broken off is provided between the upper handle body (201) and the lower handle body (202); a fixing component (204) that can be clamped with the passive trigger component (7) is provided at the top end of the upper handle body (201); and a handle cover (205) is inserted at the top end of the upper handle body (201).

5. An automatic retractable syringe according to claim 4, characterized in that: The fixing component (204) comprises a boss (2042) provided in the upper handle body (201), a plurality of upwardly inclined clamping strips (2041) being provided on the boss (2042), the clamping strips (2041) being elastic, and a clamping block (2043) for fixing the position of the clamping strips (2041) being provided inside the upper handle body (201).

6. An automatic retractable syringe according to claim 1, characterized in that: An ejection component (4) is provided inside the handle cover (205), and the ejection component (4) is used to push the passive trigger component (7) to separate from the fixed component (204). The ejection component (4) comprises an ejector rod (401), and the ejector rod (401) is slidably engaged with the handle cover (205). A pressing sheet (402) is provided below the ejector rod (401) and is slidably engaged with the inside of the handle cover (205).

7. An automatic retractable syringe according to claim 1, characterized in that: A rubber ring (12) is provided between the pintle (8) and the passive trigger component (7), a rubber tube (13) is provided under the rubber ring (12), and the rubber tube (13) is fitted between the passive trigger component (7) and the inner wall of the pintle (8).

8. An automatic retractable syringe according to claim 1, characterized in that: A weak sealing gasket (15) is provided at a position under the piston block (9) aligned with the active trigger component (5), and the weak sealing gasket (15) is used to prevent the drug liquid from entering the piston handle (2).

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