A needle protection pre-filled syringe and an assembly thereof, and a method of installing the assembly

Abstract

The present application belongs to the technical field of medical appliances, and particularly relates to a needle protection type pre-filled syringe barrel and an assembly thereof, and a mounting method of the assembly. The present application has the technical effect that the needle can be hidden after use through the limiting block unit and the protection cover unit. The present application has the following advantages: first, the protection cover and the syringe barrel are integrated to prevent falling; second, when used, the protection cover only needs to be pulled towards the palm to expose the sealing sleeve, and the protection cover is locked after being loosened; third, after injection, the operator pulls the protection cover towards the palm again to eject the protection cover to reset; fourth, when the sealing sleeve exists, the energy arm is naturally lifted, the protection cover is not in the engaged state, and the operator is facilitated to use; and fifth, the energy arm lifting block is arranged, the rotation action of the rotating ring is utilized to lift the energy arm before the syringe is used, so that the protection cover is not in the engaged state, and the protection cover is in the engaged state after the syringe is used and is staggered with the energy arm.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, in particular to a needle protection type pre-filled syringe and its assembly, and an installation method of the assembly. BACKGROUND

[0002] An injector is a medical device used for injecting liquid medicine into the human body or for cleaning purposes. When used for human injection, it is often equipped with a needle. Because the injector needs to be filled with medicine before injection, the traditional way to fill medicine is to insert the needle tip into the medicine bottle to extract the liquid medicine. However, this method is time-consuming and labor-intensive, and wastes medicine. Therefore, pre-filled injectors have appeared on the market. The pre-filled injector is filled with medicine in advance by a filling device. Therefore, when the injector is actually used, the interior of the injector is already filled with medicine, which saves time and effort.

[0003] In order to avoid the problem that the needle of the pre-filled injector is exposed after being discarded, the general solution is to re-sleeve the needle with the protective sleeve used before to avoid the exposure of the needle. However, this method has the following disadvantages: first, the protective sleeve is a temporary protection device, which is prone to falling off the needle. The probability of such falling off is higher during the violent garbage transportation; second, the protective sleeve is generally sleeved on the needle during the automatic production process in the factory. The protective sleeve is often tightly fitted with the needle, and the caliber is extremely small. On the one hand, the manual sleeving method consumes a lot of energy and affects the work efficiency of the nurse. On the other hand, if the needle is not aligned during the sleeving process, the nurse's fingers are likely to be pricked by the needle, and the patient's disease is likely to be transmitted; third, the protective sleeve is a component that is used and discarded immediately. After injection, it is often not found. Therefore, the method of sleeving the protective sleeve to avoid the exposure of the needle is not reliable.

[0004] In order to solve this problem, a protective cover structure designed specifically for storing the needle has appeared on the market. For example, a detachable injector needle protective sleeve is disclosed in Chinese Utility Model Patent No. CN215083511U, published on December 10, 2021. The detachable injector needle protective sleeve comprises a sleeve sleeved on a needle protection cap and a protective head clamped on the end of the needle protection cap and connected with the sleeve. The sleeve and the protective head are integrally formed. The inner side of the protective head is provided with a clamping groove matched with the end of the needle protection cap. The longitudinal section of the sleeve and the protective head is a regular polygon, and the cross-sectional area of the connection between the sleeve and the protective head is equal. By sleeving the sleeve on the needle protection cap, the personnel using the injector can be protected without changing the existing injector specifications. At the same time, the protective head can protect the fingers and prevent them from being pricked by the needle during use.

[0005] However, the utility model still has the following disadvantages: first, the detachable protective sleeve makes the structure design more ingenious, but there is still a risk of falling off during the garbage transfer process; second, the protective head used for sleeving the needle in the utility model needs to be aligned with the needle during installation, which still increases the burden of nurses to some extent and has the risk of injuring nurses;

[0006] Therefore, in order to meet market demand, there is an urgent need for a pre-filled needle barrel with a protective cover at present, which is installed together with the needle barrel during product preparation, and the needle can be stably covered after use of the syringe. SUMMARY

[0007] The purpose of the present application is to provide a needle protection type pre-filled needle barrel and its assembly, and the installation method of the assembly. The present application sets a limiting block unit on the needle mounting pipe of the needle barrel, and a protective cover unit sleeved on the needle mounting pipe and covering the injection needle, which achieves the technical effect of stably covering the needle after use.

[0008] The technical scheme adopted by the present application to solve the above problems is: a needle protection type pre-filled needle barrel, comprising: a needle barrel, a needle mounting pipe, an injection needle, and a sealing sleeve, wherein:

[0009] The needle mounting pipe is arranged on the needle barrel and is used for mounting the injection needle. The needle barrel, the needle mounting pipe and the injection needle are in communication. The sealing sleeve is sleeved on the needle mounting pipe and is used for protecting the injection needle. The needle protection type pre-filled needle barrel further comprises:

[0010] A limiting block unit, the limiting block unit comprising a limiting block mounted on the needle mounting pipe;

[0011] A protective cover unit, the protective cover unit comprising a protective cover sleeved on part of the needle barrel, the entire needle mounting pipe and the injection needle, and a limiting opening arranged on the protective cover and used for clamping the limiting block.

[0012] The further preferred technical scheme is that the protective cover unit further comprises:

[0013] An energy arm portion, the energy arm portion comprising one end arranged on the inner side face of the distal end of the limiting opening and the other end having an elastic force radially inward of the protective cover.

[0014] The further preferred technical scheme is that the proximal end of the energy arm has a straight face for locking, which is used for lifting the limiting block to realize the locking of the relative position of the protective cover and the injection needle.

[0015] The further preferred technical scheme is that the energy arm portion further comprises a lifting block arranged at the proximal end of the energy arm, and the proximal end of the lifting block has an inclined face for opening.

[0016] Further preferred technical solutions are that when the sealing sleeve is sleeved on the needle mounting pipe, the energy arm or the lifting block is lifted in the radial outward direction of the needle cylinder, so that the locking straight surface is disengaged from the limiting block.

[0017] Further preferred technical solutions are that the rotation limiting unit further comprises a rotation ring sleeved on the needle mounting pipe, and a guide block provided on the outer ring surface of the rotation ring, the guide block having a distal end inclined surface and a proximal end inclined surface.

[0018] The protective cover unit further comprises a guide groove portion, which comprises:

[0019] An entry groove is provided on the inner ring surface of the protective cover and is used for mounting the guide block;

[0020] A first guide surface is located on the distal end side of the entry groove, and when the protective cover moves proximally, the first guide surface slides in contact with the distal end inclined surface, thereby driving the rotation ring to rotate;

[0021] A second guide surface is connected with the first guide surface and is used for lifting the guide block to block the rotation of the rotation ring;

[0022] A third guide surface is provided on the inner ring surface of the protective cover and is located on the proximal end side of the second guide surface, and when the protective cover moves distally, the third guide surface slides in contact with the proximal end inclined surface, thereby driving the rotation ring to rotate;

[0023] A fourth guide surface is connected with the third guide surface and is used for lifting the guide block to block the rotation of the rotation ring;

[0024] A fifth guide surface is provided on the inner ring surface of the protective cover and is located on the distal end side of the third guide surface, and when the protective cover moves proximally, the fifth guide surface slides in contact with the distal end inclined surface, thereby driving the rotation ring to rotate into an exit groove provided on the inner ring surface of the protective cover.

[0025] Further preferred technical solutions are that the rotation limiting unit further comprises an energy arm lifting block provided on the rotation ring, and when the guide block is located in the entry groove, the energy arm lifting block lifts the energy arm or the lifting block in the radial outward direction of the protective cover, so that the locking straight surface is disengaged from the limiting block.

[0026] Further preferred technical solutions are that the protective cover unit further comprises a demolding window provided on the protective cover, and the demolding window exposes the position of the guide groove portion in the inner ring surface of the protective cover.

[0027] Further preferably, the protective cover unit further comprises an installation slope arranged at the proximal end of the protective cover and used to lift the limiting block when the protective cover is sleeved on the needle mounting tube, so that the proximal end of the protective cover expands radially outward.

[0028] Further preferably, the protective cover unit further comprises a deformation groove arranged at the proximal end of the protective cover and used to provide an expansion space when the proximal end of the protective cover expands radially outward.

[0029] Further preferably, the energy arm is provided with a display surface used to print a pattern on the outer side of the energy arm.

[0030] Further preferably, the protective cover unit further comprises an indicating element arranged on the outer side of the protective cover.

[0031] Further preferably, the rotating ring is composed of a large rotating ring and a small rotating ring, and when the rotating ring is sleeved on the needle mounting tube, the large rotating ring is located at the proximal end and the small rotating ring is located at the distal end.

[0032] Further preferably, the limiting block unit further comprises a mounting ring sleeved on the needle mounting tube, and the limiting block is mounted on the needle mounting tube by being arranged on the mounting ring.

[0033] Further preferably, the needle mounting tube is provided with a rotation-stopping outer ring surface, and the inner ring surface of the mounting ring is provided with a rotation-stopping inner ring surface matched with the rotation-stopping outer ring surface.

[0034] Further preferably, the needle mounting tube further comprises a limiting protrusion used to clamp the rotating ring.

[0035] A needle protection type pre-filled syringe assembly comprising a push rod and a piston, wherein:

[0036] The push rod is arranged on the piston;

[0037] The piston is mounted in the syringe and used to push the liquid medicine out through the injection needle when the push rod is pushed in the distal direction.

[0038] A mounting method of an assembly, comprising the following steps:

[0039] S1. Axially mounting the sealing sleeve into the protective cover unit;

[0040] S2. Axially sleeving the protective cover unit with the sealing sleeve on the needle mounting tube;

[0041] S3. Pushing the piston into the syringe;

[0042] S4. Setting the push rod on the piston.

[0043] The present application has the following advantages:

[0044] First, the protective cover is designed in one body with the needle cylinder, has the advantage of preventing falling off, completely covers the used needle, and locks the needle, so that it is almost impossible to expose the needle again;

[0045] Second, when the operator uses it, only the thumb and index finger are needed to pull the protective cover to the palm center direction to expose the sealing sleeve, and after loosening, the locking protective cover is convenient for injection;

[0046] Third, the operator pulls the protective cover to the palm center direction again after injection to eject and reset the protective cover, and the used injection needle is covered for disposal;

[0047] Fourth, after the protective cover is reset and locked, a "click" sound is emitted to remind the operator that the protective cover has been locked;

[0048] Fifth, when the sealing sleeve exists, the energy arm is naturally lifted, the protective cover is not in the engaged state, and the operator is convenient to use;

[0049] Sixth, the energy arm lifting block is arranged on the rotating ring of the installation guide block, the energy arm is lifted by the rotating action of the rotating ring before the use of the syringe, so that the protective cover is not in the engaged state, and after the use of the syringe, the energy arm is staggered, so that the protective cover returns to the engaged state. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is an exploded view of the pre-filled needle cylinder in the present application.

[0051] Figure 2 It is a structure schematic view of the present application when the sealing sleeve is not taken off and the protective cover is located at the far end of the needle cylinder.

[0052] Figure 3 It is a structure schematic view of the present application when the sealing sleeve is not taken off.

[0053] Figure 4 It is a structure schematic view of the present application when the sealing sleeve is taken off.

[0054] Figure 5 It is a structure schematic view of the present application when the sealing sleeve is taken off and the protective cover is located at the far end of the needle cylinder.

[0055] Figure 6 It is a structure schematic view of the present application when the sealing sleeve is taken off and the protective cover is located at the far end of the needle cylinder. Figure 2 It is a structure schematic view of the present application when the sealing sleeve is taken off and the protective cover is located at the far end of the needle cylinder.

[0056] Figure 7 It is a structure schematic view of the present application when the sealing sleeve is taken off and the protective cover is located at the far end of the needle cylinder. Figure 6 It is a structure schematic view of the present application when the sealing sleeve is taken off and the protective cover is located at the far end of the needle cylinder.

[0057] Figure 8 For Figure 7 Amplification structure diagram.

[0058] Figure 9 For the protective cover unit structure diagram.

[0059] Figure 10 For the guide groove structure diagram.

[0060] Figure 11 For the rotation limiting unit structure diagram.

[0061] Figure 12 For the limiting block unit structure diagram.

[0062] Figure 13 For the limiting block unit structure diagram.

[0063] In the drawings, the components represented by each reference numeral are as follows: limiting block unit 1, protective cover unit 2, rotation limiting unit 3, needle cylinder 11, needle mounting tube 12, injection needle 13, sealing sleeve 14, mounting ring 101, limiting block 102, rotation-stopping inner ring surface 103, protective cover 201, limiting port 202, energy arm portion 203, guide groove portion 204, demolding window 205, deformation groove 206, mounting inclined surface 207, indicating member 208, rotation ring 301, guide block 302, energy arm lifting block 303, energy arm 203a, locking straight surface 203b, lifting block 203c, opening inclined surface 203d, entry groove 204a, first guide surface 204b, second guide surface 204c, third guide surface 204d, fourth guide surface 204e, fifth guide surface 204f, exit groove 204g, large rotation ring 301a, small rotation ring 301b, distal end inclined surface 302a, proximal end inclined surface 302b, rotation-stopping outer ring surface 12a, position-stopping protrusion 12b, sealing sleeve protrusion 14a. DETAILED DESCRIPTION

[0064] DEFINITIONS

[0065] 1. Setting: refers to the way of connecting two components together, such as welding, riveting, threaded connection, wire connection, etc.

[0066] 2. Inward: refers to the side closer to the narrower side, or the side farther away from the more spacious side; similarly, "outward" refers to the side closer to the more spacious side, or the side farther away from the narrower side.

[0067] 3. Clamping: refers to the way of temporarily fixing two components together by extruding the inner and / or outer side of component B.

[0068] 4. distal end: refers to the end of the component installed on the syringe, away from the opening of the push rod installed on the syringe, or the end close to the installation position of the injection needle; similarly, "proximal end" refers to the end of the component installed on the syringe, close to the opening of the push rod installed on the syringe, or the end away from the installation position of the injection needle.

[0069] 5. axial: refers to the direction of the straight line formed by extending infinitely in the direction of the injection needle.

[0070] 6. radial: refers to the straight line direction along the diameter or radius, or the straight line direction perpendicular to the shaft.

[0071] 7. jacking: refers to the action of component one on component two, so that component two moves in the opposite direction of the position of component one.

[0072] The following description is only a preferred embodiment of the present application, and does not limit the scope of the present application. In addition, the terms "vertical", "horizontal", "top", "bottom", "front", "back", "upper", "lower", etc. mentioned in the embodiments of the present application indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0073] It should be further pointed out that, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like in the description should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] Embodiment: as shown in the accompanying Figures 1-13 A needle protection type pre-filled syringe, comprising: a syringe 11, a needle mounting tube 12, an injection needle 13, a sealing sleeve 14, wherein:

[0075] The needle mounting tube 12 is arranged on the syringe 11 and used for mounting the injection needle 13, the syringe 11, the needle mounting tube 12 and the injection needle 13 are in communication, the sealing sleeve 14 is sleeved on the needle mounting tube 12 and used for protecting the injection needle 13, further comprising:

[0076] A limiting block unit 1, the limiting block unit 1 comprises a limiting block 102 mounted on the needle mounting tube 12;

[0077] A protective cover unit 2, which comprises a protective cover 201 sleeved on part of the needle cylinder 11, and all of the needle mounting tube 12 and the injection needle 13, and a limiting port 202 arranged on the protective cover 201 and used for clamping the limiting block unit 1.

[0078] In the embodiment, the pre-filled needle cylinder is not provided with a push rod and a piston when it is delivered from the factory, but is directly delivered to a downstream factory for medicine filling, and then the piston is added. The needle cylinder 11, the needle mounting tube 12, the injection needle 13 and the sealing sleeve 14 are necessary structures for the needle cylinder to realize the injection function in the prior art. When the needle cylinder 11, the needle mounting tube 12, the injection needle 13 and the sealing sleeve 14 are assembled, the mounting mode of the pre-filled needle cylinder is as follows:

[0079] 1. The limiting block 102 is arranged on the needle mounting tube 12. If the limiting block 102 uses a movable mounting structure, the limiting block 102 is first mounted on the needle mounting tube 12.

[0080] 2. The protective cover 201 is sleeved on the needle cylinder 11, and the limiting block 102 is clamped in the limiting port 202.

[0081] The use mode of the pre-filled needle cylinder is as follows:

[0082] 1. The protective cover 201 is pulled towards the proximal end along the needle cylinder 11, and the sealing sleeve 14 is exposed.

[0083] 2. The sealing sleeve 14 is removed from the needle mounting tube 12, and the injection needle 13 is exposed.

[0084] 3. Injection operation is performed.

[0085] 4. After the injection is completed, the protective cover 201 is pushed towards the distal end along the needle cylinder 11 until the injection needle 13 is completely covered.

[0086] Among them, the width of the protruding part of the limiting block 102 is slightly smaller than the width of the limiting port 202, and when inserted into the limiting port 202, the protective cover unit 2 can move along the needle cylinder 11 without rotating relative to the needle cylinder 11.

[0087] In addition, there is a friction force between the limiting block 102 and the protective cover unit 2, which can fix the position of the protective cover 201 without being manually pushed and pulled, and the protective cover 201 will not slide towards the distal end during injection, and will not slide towards the proximal end when protecting the injection needle 13.

[0088] In addition, the syringe will be subjected to lamp inspection when the syringe is shipped, and the "lamp inspection" means that the filling and stopper of the syringe are checked by artificial observation through the needle cylinder, and most of the integrated protective covers on the market will affect this process. For example, the Chinese utility model with the publication number CN214911888U and the publication date of 2021-11-30 discloses a syringe needle protection device and a safety syringe, which comprises a protective sleeve, an installation inner sleeve and a spring. The inner and outer sleeve sleeve connection blocks the view inside the needle cylinder, affecting the lamp inspection process. In the embodiment, the protective cover unit 2 only covers the needle mounting pipe 12 and part of the distal end of the needle cylinder 11 when the needle cylinder is not in use, and does not affect the lamp inspection process.

[0089] In order to release the hand of the operator after injection, the protective cover 201 can automatically slide to the distal end, and the protective cover unit 2 further comprises an energy arm 203, which comprises an energy arm 203a having a radial inward elastic force on the other end, which is arranged on the distal end of the limiting port 202.

[0090] When the operator pulls the protective cover 201 to the proximal end, the limiting block 102 lifts the energy arm 203a radially outward along the protective cover 201, so that the energy arm 203a stores energy. Under the action of the energy arm 203a, the protective cover 201 has a tendency to move to the distal end. After injection, the operator releases his hands, the energy arm 203a releases energy and acts on the limiting block 102, causing the protective cover 201 to move to the distal end until it completely covers the injection needle 13.

[0091] In order to make the protective cover 201 move to the distal end until it completely covers the injection needle 13, the protective cover 201 realizes locking and cannot move to the proximal end again. Further, the energy arm 203a has a locking straight face 203b at the proximal end, which is used to lift the limiting block 102 to realize the locking of the relative position of the protective cover 201 and the injection needle 13. In this way, the injection needle 13 will not easily be exposed when it is discarded.

[0092] When the locking straight face 203b of the energy arm 203a just slides down and engages with the limiting block 102, a "click" sound will be emitted to remind the operator that the protective cover 201 realizes complete engagement and can be discarded.

[0093] In order to make the energy arm 203a more smoothly during the energy storage process when the protective cover 201 moves proximally, further, the energy arm 203a further comprises a lifting block 203c arranged at the proximal end of the energy arm 203a, when the protective cover 201 moves proximally, the limiting block 102 lifts the energy arm 203a radially outward along the protective cover 201, the lifting block 203c also abuts against the outer wall of the needle cylinder 11, so that the energy arm 203a is subjected to a force radially outward along the protective cover 201, and the two forces jointly support the outward expansion of the energy arm 203a, making the force and expansion process more uniform.

[0094] Further, the lifting block 203c has an opening slope 203d at the proximal end, so that when the lifting block 203c passes over the limiting block 102, the opening slope 203d can rub along the upper end of the limiting block 102, making the passing process easier.

[0095] In order to make the energy arm 203a not need to be intentionally pulled outward when the protective cover 201 is opened proximally, so that the lifting block 203c can pass over the limiting block 102, further, when the sealing sleeve 14 is sleeved on the needle mounting tube 12, the energy arm 203a or the lifting block 203c is lifted in the radial outward direction of the needle cylinder 11, so that the locking straight surface 203b is disengaged from the limiting block 102.

[0096] The benefits of this arrangement are that when the sealing sleeve 14 is sleeved on the needle mounting tube 12 to protect the injection needle 13, the protective cover 201 can be freely moved proximally, and after the sealing sleeve 14 is pulled off the needle mounting tube 12, the protective cover 201 is reset distally through the energy arm 203a, the energy arm 203a loses the support of the sealing sleeve 14 and thus falls down, so that the locking straight surface 203b lifts the limiting block 102, completing the locking, and throughout the process, the operator can complete the operation with one hand without intentionally pulling the energy arm 203a during the opening process.

[0097] In order to make the protective cover 201 fixed after sliding proximally, further, the needle protection type pre-filled syringe further comprises a rotation limiting unit 3, wherein the rotation limiting unit 3 comprises a rotating ring 301 sleeved on the needle mounting tube 12, and a guide block 302 arranged on the outer ring surface of the rotating ring 301, the guide block 302 has a distal slope 302a and a proximal slope 302b;

[0098] The protective cover unit 2 further comprises a guide groove portion 204, the guide groove portion comprises:

[0099] An entry slot 204a is arranged on the inner ring surface of the protective cover 201 and used for mounting the guide block 302;

[0100] A first guide surface 204b is located at the distal side of the entry slot 204a, and when the protective cover 201 moves proximally, the first guide surface 204b is in contact with the distal inclined surface 302a and slides thereon, thereby driving the rotating ring 301 to rotate;

[0101] A second guide surface 204c is connected with the first guide surface 204b and used for lifting the guide block 302 to block the rotation of the rotating ring 301;

[0102] A third guide surface 204d is arranged on the inner ring surface of the protective cover 201 and located at the proximal side of the second guide surface 204c, and when the protective cover 201 moves distally, the third guide surface 204d is in contact with the proximal inclined surface 302b and slides thereon, thereby driving the rotating ring 301 to rotate;

[0103] A fourth guide surface 204e is connected with the third guide surface 204d and used for lifting the guide block 302 to block the rotation of the rotating ring 301;

[0104] A fifth guide surface 204f is arranged on the inner ring surface of the protective cover 201 and located at the distal side of the third guide surface 204d, and when the protective cover 201 moves proximally, the fifth guide surface 204f is in contact with the distal inclined surface 302a and slides thereon, thereby driving the rotating ring 301 to rotate and enter an exit slot 204g arranged on the inner ring surface of the protective cover 201.

[0105] After the rotating limiting unit 3 and the guide slot part 204 are arranged, the use method of the pre-filled syringe is as follows:

[0106] 1. The protective cover 201 is pulled proximally along the syringe 11 to expose the sealing sleeve 14, at this time, the guide block 302 enters the entry slot 204a, and the protective cover 201 is continuously pulled proximally along the syringe 11, the distal inclined surface 302a of the guide block 302 is in contact with and slides along the first guide surface 204b, until the guide block 302 stops moving against the second guide surface 204c, at this time, all the sealing sleeve 14 is exposed;

[0107] 2. The protective cover 201 is loosened, and the protective cover 201 moves distally under the action of the energy arm 203a, at this time, the proximal inclined surface 302b of the guide block 302 is in contact with and slides along the third guide surface 204d, until the guide block 302 stops moving against the fourth guide surface 204e, at this time, the protective cover 201 is locked,

[0108] 2. The seal sleeve 14 is removed from the needle mounting tube 12, exposing the injection needle 13, and the protective cover 201 is moved distally without affecting the removal of the seal sleeve 14;

[0109] 3. Perform the injection operation;

[0110] 4. After the injection is completed, pull the protective cover 201 proximally along the needle cylinder 11, at which time the distal inclined surface 302a of the guide block 302 abuts and slides along the fifth guide surface 204f, until the guide block 302 abuts the groove surface of the exit groove 204g, or reaches the limit of the expansion distance of the energy arm 203a and stops moving, at which time the protective cover 201 is released, the protective cover 201 is released by the energy release of the energy arm 203a, and is ejected distally, at which time the guide block 302 slides along the exit groove 204g until the locking straight surface 203b on the energy arm 203a engages the limiting block 102, completing the locking of the protective cover 201.

[0111] The benefits of setting the rotation limiting unit 3 and the guide groove 204 are:

[0112] 1. The operator only needs to pull the protective cover 201 in the proximal direction to achieve steps 1-4, which is always away from the injection needle 13, effectively avoiding the risk of being stabbed during operation;

[0113] 2. The operation of pulling the protective cover 201 in the proximal direction is very simple, only the thumb and index finger need to pull the protective cover 201 towards the palm, so that the operator with small fingers can also use it easily.

[0114] In actual production, the seal sleeve for the injection needle has different specifications, and some smaller specifications of the seal sleeve cannot completely lift the energy arm 203a, so that in step 1, the operator still needs to use the other hand to lift the energy arm 203a to release the engagement with the limiting block 102. Further, the rotation limiting unit 3 further comprises an energy arm lifting block 303 arranged on the rotation ring 301, when the guide block 302 is located in the entry groove 204a, the energy arm lifting block 303 lifts the energy arm 203a or the lifting block 203c radially outward along the protective cover 201, so that the locking straight surface 203b is disengaged from the limiting block 102.

[0115] In step 1, the guide block 302 is located in the entry slot 204a, at this time the energy arm lifting block 303 just lifts the energy arm 203a; in step 4, the guide block 302 is located in the exit slot 204g, at this time the rotating ring 301 has been rotated by a certain angle, causing the energy arm lifting block 303 to be staggered with the energy arm 203a, so that the energy arm 203a can engage the limiting block 102 to achieve the locking function, which is a clever design, which utilizes the position change of the guide block 302 to achieve the function of unlocking the energy arm 203a before use of the syringe.

[0116] The protective cover unit 2 further comprises a demolding window 205 provided on the protective cover 201, which exposes the position of the guide groove part 204 in the inner ring surface of the protective cover 201.

[0117] The function of the demolding window 205 is:

[0118] 1. Facilitate the protective cover unit 2 to give backspace when it is separated from the mold during the demolding stage, avoiding cracking during demolding;

[0119] 2. The operator can intuitively see the engagement state between the guide block 302 and the first guide surface 204b, the second guide surface 204c, the third guide surface 204d, the fourth guide surface 204e, and the fifth guide surface 204f, to facilitate confirmation of whether the guide block 302 is in the correct engagement position.

[0120] The protective cover unit 2 further comprises an installation slope 207 provided at the proximal end of the protective cover 201 and expanding radially outward when the protective cover 201 is sleeved on the needle mounting tube 12, thereby lifting the limiting block 102.

[0121] When the protective cover 201 is sleeved on the needle mounting tube 12, it needs to pass over the limiting block 102 and make the limiting block 102 engage into the limiting opening 202. In this process, the proximal end of the protective cover 201 needs to expand radially to allow the limiting block 102 to pass through, and the installation slope 207 is provided to make the process of passing through the limiting block 102 more smooth.

[0122] Further, the protective cover unit 2 further comprises a deformation groove 206 provided at the proximal end of the protective cover 201 and providing expansion space when the proximal end of the protective cover 201 expands radially outward.

[0123] The outer side of the energy arm 203a is provided with a display surface 203e for printing patterns.

[0124] The outer side of the energy arm 203a is just a plane, which can be used to set the display surface 203e, which can be used to carve product model, built-in medicine and other important information.

[0125] The protective cover unit 2 also includes an indication 208 on the outer side of the protective cover 201.

[0126] The indication 208 is a pattern of several small protrusions, which can be used to indicate the direction of the protective cover 201 to be pulled by the operator, so as to avoid misoperation of the operator who is not clear how to use.

[0127] The rotating ring 301 is composed of a large rotating ring 301a and a small rotating ring 301b. When the rotating ring 301 is sleeved on the needle mounting pipe 12, the large rotating ring 301a is located at the proximal end, and the small rotating ring 301b is located at the distal end.

[0128] When the jacking block 203c on the energy arm 203a passes the limiting block 102, it will also touch the rotating ring 301, which has the risk of being stuck. Therefore, the rotating ring 301 is designed as a double-layer ring composed of a large rotating ring 301a and a small rotating ring 301b. The large ring is at the proximal end, and the small ring is at the distal end. When the jacking block 203c of the energy arm 203a is jacked up by the rotating ring 301, the jacking block 203c will pass the rotating ring 301 along the steps formed by the large rotating ring 301a and the small rotating ring 301b, avoiding the phenomenon of being stuck.

[0129] The limiting block unit 1 includes a mounting ring 101 sleeved on the needle mounting pipe 12, and a limiting block 102 arranged on the mounting ring 101 and used for clamping the limiting port 202.

[0130] The limiting block unit 1 is directly arranged on the needle cylinder 11, which will change the structure of the existing needle cylinder 11, which is not conducive to mass production. Therefore, the limiting block unit 1 is designed in the form of active installation. According to the specifications of the needle mounting pipe 12 on the existing needle cylinder 11, the mounting ring 101 of appropriate size can be prepared to be sleeved on the needle mounting pipe 12, and the installation of the limiting block 102 is completed.

[0131] In order to avoid the rotation of the limiting block 102 during use, causing the entire protective cover unit 2 to rotate with it, affecting the clamping process, the needle mounting pipe 12 is provided with a rotation stopping outer ring surface 12a, and the inner side ring surface of the mounting ring 101 is provided with a rotation stopping inner ring surface 103 matched with the rotation stopping outer ring surface 12a.

[0132] The needle mounting pipe 12 also includes a limiting protrusion 12b for clamping the rotating ring 301.

[0133] As attached Figure 8 As shown, when the rotating ring 301 is sleeved on the needle mounting tube 12, it passes over the stop protrusion 12b and engages between the stop protrusion 12b and the distal end face of the syringe 11, so that the rotating ring 301 can only rotate and cannot move along the axial direction of the syringe 11.

[0134] An assembly for a needle-protected pre-filled syringe, characterized in that it includes a push rod and a piston; wherein:

[0135] The push rod is mounted on the piston;

[0136] The piston is installed in the syringe 11 and pushes the push rod in the distal direction to eject the liquid medicine through the injection needle 13.

[0137] A method for installing a component, characterized by comprising the following steps:

[0138] S1. Insert the sealing sleeve 14 into the protective cover unit 2 along the axial direction;

[0139] S2. The protective cover unit 2 with the sealing sleeve 14 is axially sleeved onto the needle mounting tube 12;

[0140] S3. Push the piston into the syringe 11;

[0141] S4. The push rod is mounted on the piston.

[0142] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of the present invention. These are non-inventive modifications and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A needle protection pre-filled syringe comprising: A needle cylinder (11), a needle mounting tube (12), an injection needle (13), a sealing sleeve (14), wherein: The needle mounting tube (12) is arranged on the needle cylinder (11) and used for mounting the injection needle (13), the needle cylinder (11), the needle mounting tube (12) and the injection needle (13) are in communication, the sealing sleeve (14) is sleeved on the needle mounting tube (12) and used for protecting the injection needle (13), characterized in that further comprising: A limiting block unit (1), the limiting block unit (1) comprises a limiting block (102) mounted on the needle mounting tube (12); A protective cover unit (2), the protective cover unit (2) comprises a protective cover (201) sleeved on part of the needle cylinder (11) and all of the needle mounting tube (12) and the injection needle (13), and a limiting opening (202) arranged on the protective cover (201) and used for clamping the limiting block (102); The protective cover unit (2) further comprises: An energy arm portion (203), the energy arm portion (203) comprises an energy arm (203a) having an elastic force radially inward of the protective cover (201) at one end arranged on the inner side of the distal end of the limiting opening (202) and at the other end; the proximal end of the energy arm (203a) has a straight surface (203b) for locking, which is used for lifting the limiting block (102) to realize the locking of the relative position of the protective cover (201) and the injection needle (13); the energy arm portion (203) further comprises a lifting block (203c) arranged at the proximal end of the energy arm (203a), the proximal end of the lifting block (203c) has an opening inclined surface (203d); further comprising a rotation limiting unit (3), wherein the rotation limiting unit (3) comprises a rotating ring (301) sleeved on the needle mounting tube (12), and a guide block (302) arranged on the outer ring surface of the rotating ring (301), the guide block (302) has a distal end inclined surface (302a) and a proximal end inclined surface (302b); The protective cover unit (2) further comprises a guide groove portion (204), the guide groove portion comprises: An entry groove (204a) arranged on the inner side ring surface of the protective cover (201) and used for mounting the guide block (302); A first guide surface (204b) located on the distal end side of the entry groove (204a), when the protective cover (201) moves towards the proximal end, the first guide surface (204b) is in contact with the distal end inclined surface (302a) and slides, thereby driving the rotating ring (301) to rotate; A second guide surface (204c) connected with the first guide surface (204b) and used for lifting the guide block (302) to block the rotation of the rotating ring (301); A third guide surface (204d) is arranged on the inner ring surface of the protective cover (201) and located on the proximal side of the second guide surface (204c). When the protective cover (201) moves distally, the third guide surface (204d) is in contact with and slides along the proximal inclined surface (302b), thereby driving the rotating ring (301) to rotate. A fourth guide surface (204e) is connected with the third guide surface (204d) and used to lift the guide block (302) to block the rotation of the rotating ring (301). A fifth guide surface (204f) is arranged on the inner ring surface of the protective cover (201) and located on the distal side of the third guide surface (204d). When the protective cover (201) moves proximally, the fifth guide surface (204f) is in contact with and slides along the distal inclined surface (302a), thereby driving the rotating ring (301) to rotate into the exit slot (204g) arranged on the inner ring surface of the protective cover (201). When the sealing sleeve (14) is sleeved on the needle mounting tube (12), the energy arm (203a) or the lifting block (203c) is lifted in the radial outward direction of the needle cylinder (11), so that the locking straight surface (203b) is disengaged from the clamping state with the limiting block (102).

2. A needle protection pre-filled syringe according to claim 1, wherein The rotating limiting unit (3) further comprises an energy arm lifting block (303) arranged on the rotating ring (301). When the guide block (302) is located in the entry slot (204a), the energy arm lifting block (303) lifts the energy arm (203a) or the lifting block (203c) in the radial outward direction of the protective cover (201), so that the locking straight surface (203b) is disengaged from the clamping state with the limiting block (102).

3. The needle protection pre-filled syringe according to claim 1, wherein The protective cover unit (2) further comprises a demolding window (205) arranged on the protective cover (201). The demolding window (205) exposes the position of the guide groove (204) in the inner ring surface of the protective cover (201).

4. The needle protection pre-filled syringe according to claim 1, wherein The protective cover unit (2) further comprises a mounting inclined surface (207) arranged on the proximal end of the protective cover (201) and used to lift the limiting block (102) when the protective cover (201) is sleeved on the needle mounting tube (12), thereby expanding the protective cover (201) radially outward.

5. The needle protection pre-filled syringe according to claim 1, wherein The protective cover unit (2) further comprises a deformation groove (206) arranged on the proximal end of the protective cover (201) and providing an expansion space when the protective cover (201) expands radially outward.

6. The needle protection pre-filled syringe according to claim 1, wherein An exhibition surface (203e) for printing patterns is arranged on the outer side of the energy arm (203a).

7. The needle protection pre-filled syringe according to claim 1, wherein The protective cover unit (2) further comprises an indicator (208) arranged on the outer side of the protective cover (201).

8. The needle protection pre-filled syringe according to claim 1, wherein The rotating ring (301) is composed of a large rotating ring (301a) and a small rotating ring (301b). When the rotating ring (301) is sleeved on the needle mounting tube (12), the large rotating ring (301a) is located on the proximal end and the small rotating ring (301b) is located on the distal end.

9. The needle protection pre-filled syringe according to claim 1, wherein The limiting block unit (1) further comprises a mounting ring (101) which is sleevedly mounted on the needle mounting pipe (12), and the limiting block (102) is mounted on the needle mounting pipe (12) by being arranged on the mounting ring (101).

10. A needle protection pre-filled syringe according to claim 9, wherein The needle mounting pipe (12) is provided with a rotation-stopping outer ring surface (12a), and the inner ring surface of the mounting ring (101) is provided with a rotation-stopping inner ring surface (103) matched with the rotation-stopping outer ring surface (12a).

11. The needle protection pre-filled syringe according to claim 1, wherein The needle mounting pipe (12) further comprises a position-stopping protrusion (12b) for clamping the rotating ring (301).

12. An assembly comprising the needle protection pre-filled syringe of any one of claims 1 to 11, wherein, It comprises a push rod and a piston; wherein: The push rod is arranged on the piston; The piston is mounted in the needle cylinder (11), and when the piston pushes the push rod in the distal direction, the piston is used for pushing the liquid medicine out through the injection needle (13).

13. A method of mounting an assembly as claimed in claim 12, characterised in that, It comprises the following steps: S1. The sealing sleeve (14) is axially mounted in the protective cover unit (2); S2. The protective cover unit (2) with the sealing sleeve (14) is axially sleeved on the needle mounting pipe (12); S3. The piston is pushed into the needle cylinder (11); S4. The push rod is arranged on the piston.

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