CN218636426U - Syringe needle protection type pre-filling and sealing syringe and assembly thereof - Google Patents

Abstract

The utility model belongs to the technical field of medical appliances, especially, relate to a syringe needle protection formula embedment cylinder in advance and subassembly thereof. The utility model discloses a stopper unit to and the safety cover unit has played the technological effect that can cover the syringe needle after using. The utility model has the advantages of it is following: firstly, the protective cover and the needle cylinder are integrated to prevent falling; secondly, when in use, the sealing sleeve can be exposed only by pulling the protective cover towards the palm center direction, and the protective cover is locked after being released; thirdly, after injection, the operator pulls the protective cover towards the palm again to eject and reset the protective cover; fourthly, when the sealing sleeve exists, the energy arm is naturally jacked up, and the protective cover is not in a clamping state, so that the protective cover is convenient for an operator to use; and fifthly, an energy arm jacking block is arranged, the energy arm is jacked up before the injector is used by utilizing the rotation action of the rotating ring, so that the protective cover is not in a clamping state, and the protective cover is staggered with the energy arm after the injector is used, so that the protective cover is in the clamping state.

Description

Syringe needle protection type pre-filling and sealing syringe and assembly thereof

Technical Field

The utility model belongs to the technical field of medical appliances, especially, relate to a syringe needle protected embedment cylinder and subassembly in advance.

Background

A syringe is a medical device used for injecting liquid medicine into a human body or for cleaning purposes, and is often provided with a needle when used for injection into a human body. Because need fill the medicine in the syringe before the injection, the mode of traditional filling medicine is with needle point insert extraction liquid medicine in the medicine bottle, but does and waste time and energy, and extravagant medicine, so the prefilled syringe has appeared in the existing market, fills the medicine in the syringe in advance through embedment equipment, and when the syringe was used in practice like this, inside had been equipped with the medicine, used labour saving and time saving.

In order to avoid the problem that the needle head is exposed after the pre-filled syringe is discarded, the common solution is to re-sleeve the needle head by the protective sleeve used before to avoid the exposure of the needle head, but the defect of doing so is that firstly, the protective sleeve is a temporary protective device and is very easy to fall off from the needle head, and the probability of the fall-off phenomenon is higher in the violent garbage transportation process; secondly, the protective sleeve is generally sleeved on the needle head in the factory automation production process, the protective sleeve is often tightly sewed with the needle head, the caliber is extremely small, on one hand, the manual sleeving back mode consumes energy and affects the working efficiency of a nurse, on the other hand, if the needle head is not aligned in the sleeving back process, fingers of the nurse are very likely to be pricked on the needle head, and diseases of a patient are infected; third, the shield is typically a disposable component that is often not found after injection, and therefore the manner in which the shield is withdrawn to prevent needle exposure is unreliable.

In order to solve the problem, a protective cover structure specially designed for accommodating a needle appears in the market, for example, the Chinese utility model patent with the publication number of CN215083511U and the publication date of 2021-12-10 discloses a detachable syringe needle protective cover, which comprises a sleeve sleeved on a needle protective cover and a protective head clamped at the end part of the needle protective cover and connected with the sleeve, wherein the sleeve and the protective head are integrally formed; a clamping groove matched with the end part of the needle head protective cap is formed in the inner side of the protective head; the longitudinal sections of the sleeve and the protective head are regular polygons, and the cross sectional areas of the joints of the sleeve and the protective head are equal. The sleeve sleeved on the needle head protective cap can protect people using the injector under the condition of not changing the specification of the existing injector; meanwhile, the protective head can protect fingers and prevent the fingers from being punctured by the needle head in the using process.

However, the utility model has the following disadvantages: firstly, the detachable protective sleeve always has the risk of falling off in the garbage transferring process no matter how delicate the structural design is; secondly, when the protective head used for sleeving the needle head in the utility model is used, the needle head needs to be aligned and installed, the burden is still increased for the work of a nurse to a certain extent, and the risk of hurting the nurse is accompanied;

in view of the above, in order to meet the market demand, there is a need for a pre-filled syringe with a shield, which is assembled with the syringe during the preparation of the product and can stably shield the needle after the syringe is used.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a syringe needle protection formula embedment cylinder and subassembly in advance, the utility model discloses a stopper unit of setting on the needle installation pipe that is located the cylinder to and cup joint on the needle installation pipe and the safety cover unit of cladding syringe needle has played the technological effect that can stably cover the syringe needle after using.

The utility model provides a technical scheme that above-mentioned problem adopted is: a needle-protected pre-filled syringe comprising: the cylinder, needle installation pipe, syringe needle, the seal cover, wherein:

the needle installation pipe sets up on the cylinder for the installation the syringe needle, the cylinder, needle installation pipe, syringe needle are in the intercommunication state, the seal cover cup joints on the needle installation pipe, and be used for the protection the syringe needle still includes:

a stopper unit including a stopper mounted on the needle mounting tube;

the safety cover unit, the safety cover unit is including cup jointing part the cylinder, and whole the safety cover on needle installation pipe and the syringe needle, and set up on the safety cover, and be used for the block the spacing mouth of stopper.

The further preferred technical scheme is as follows: the protective cover unit further includes:

and the energy arm part comprises an energy arm, one end of the energy arm is arranged on the inner side surface of the far end of the limit port, and the other end of the energy arm is provided with an elastic force which is inwards along the radial direction of the protective cover.

The further preferred technical scheme is as follows: the proximal end of the energy arm is provided with a straight surface for locking, and the straight surface is used for jacking the limiting block to lock the relative position of the protective cover and the injection needle.

The further preferred technical scheme is as follows: the energy arm portion further includes a jack-up block disposed at a proximal end of the energy arm, the jack-up block proximal end having an opening ramp.

The further preferred technical scheme is as follows: when the sealing sleeve is sleeved on the needle mounting tube, the energy arm or the jacking block is jacked up along the radial outward direction of the needle cylinder, so that the locking straight surface is separated from the limiting block in a clamping state.

The further preferred technical scheme is as follows: the needle mounting device is characterized by further comprising a rotation limiting unit, wherein the rotation limiting unit comprises a rotating ring sleeved on the needle mounting tube and a guide block arranged on the outer ring surface of the rotating ring, and the guide block is provided with a far-end inclined surface and a near-end inclined surface;

the protective cover unit further includes a guide groove portion including:

the inlet groove is arranged on the annular surface of the inner side of the protective cover and is used for installing the guide block;

the first guide surface is positioned on the far end side of the entering groove, and when the protective cover moves towards the near end, the first guide surface is attached to the far end inclined surface to slide, so that the rotating ring is driven to rotate;

the second guide surface is connected with the first guide surface and used for jacking the guide block to block the rotation of the rotating ring;

the third guide surface is arranged on the inner ring surface of the protective cover and is positioned at the near end side of the second guide surface, and when the protective cover moves towards the far end, the third guide surface is attached to the near end inclined surface and slides, so that the rotating ring is driven to rotate;

the fourth guide surface is connected with the third guide surface and used for jacking the guide block to block the rotation of the rotating ring;

the fifth guide surface is arranged on the inner ring surface of the protective cover and located on the far end side of the third guide surface, and when the protective cover moves towards the near end, the fifth guide surface is attached to the far end inclined surface to slide, so that the rotating ring is driven to rotate and enter the exit groove formed in the inner ring surface of the protective cover.

The further preferred technical scheme is as follows: the rotation limiting unit further comprises an energy arm jacking block arranged on the rotating ring, and when the guide block is located in the entering groove, the energy arm jacking block jacks up the energy arm or the jacking block along the radial direction of the protective cover, so that the locking straight surface is separated from the limiting block in a clamping state.

The further preferred technical scheme is as follows: the protective cover unit further comprises a window for demolding arranged on the protective cover, and the window for demolding exposes the position of the guide groove part in the inner ring surface of the protective cover.

The further preferred technical scheme is as follows: the protective cover unit further comprises a protective cover near end, and the protective cover is sleeved on the needle installation tube to jack up the limiting block, so that the protective cover near end is radially outwards expanded to form an installation inclined plane.

The further preferred technical scheme is as follows: the protection cover unit is still including setting up the protection cover near-end, and provide the deformation groove in expansion space when the protection cover near-end radially outwards expands.

The further preferred technical scheme is as follows: and a display surface for printing patterns is arranged on the outer side surface of the energy arm.

The further preferred technical scheme is as follows: the protective cover unit further comprises an indicator arranged on the outer side surface of the protective cover.

The further preferred technical scheme is as follows: the rotating ring is composed of a large rotating ring and a small rotating ring, when the rotating ring is sleeved on the needle mounting tube, the large rotating ring is located at the near end, and the small rotating ring is located at the far end.

The further preferred technical scheme is as follows: the limiting block unit further comprises a mounting ring mounted on the needle mounting pipe in a sleeved mode, and the limiting block is mounted on the needle mounting pipe in a mode of being arranged on the mounting ring.

The further preferred technical scheme is as follows: the needle mounting tube is provided with a rotation stopping outer ring surface, and a rotation stopping inner ring surface matched with the rotation stopping outer ring surface is arranged on the mounting ring inner side ring surface.

The further preferred technical scheme is as follows: the needle mounting tube further comprises a stop protrusion for clamping the rotating ring.

An assembly of a needle head protection type pre-filling and sealing needle cylinder comprises a push rod and a piston; wherein:

the push rod is arranged on the piston;

the piston is arranged in the injection syringe and is used for pushing the liquid medicine out through the injection needle when the push rod is pushed towards the far end direction.

A method of mounting a component, comprising the steps of:

s1, axially installing the needle protection sleeve into the protection cover;

s2, sleeving the protective cover with the needle protective sleeve on the needle mounting piece along the axial direction;

s3, pushing the piston into the injection needle cylinder;

and S4, arranging the push rod on the piston.

A method of using an assembly, comprising the steps of:

s1, axially moving the protective cover along the proximal direction of the injection needle cylinder until one side of the back surface of the elastic hook supports against the distal side surface of the sliding port, so as to expose the needle protective sleeve;

s2, opening the needle protection sleeve to expose the injection needle;

s3, performing injection operation;

and S4, after the injection operation is finished, axially moving the protective cover along the far end direction of the injection needle cylinder until one side of the elastic hook catches the side face of the near end of the sliding port, so that the injection needle is completely covered.

The utility model has the advantages of it is following:

firstly, the protective cover and the needle cylinder are designed into a whole, so that the protective cover has the advantage of falling prevention, and the needle head can hardly be exposed again after the needle head is completely covered and locked;

secondly, when the injection syringe is used by an operator, the sealing sleeve can be exposed only by pulling the protective cover towards the palm center by using a thumb and a forefinger, and the protective cover is locked after being released so as to facilitate injection;

thirdly, after injection, the operator pulls the protective cover to the palm direction again to eject the protective cover for resetting, and the used injection needle is convenient to discard;

fourthly, after the protective cover is reset and locked, a 'snap' sound is emitted to remind an operator that the protective cover is locked;

fifthly, when the sealing sleeve exists, the energy arm is naturally jacked up, and the protective cover is not in a clamping state, so that the protective cover is convenient for an operator to use;

sixthly, an energy arm jacking block is arranged on the rotating ring of the installation guide block, the energy arm is jacked up before the injector is used by utilizing the rotating action of the rotating ring, so that the protective cover is not in a clamping state, and the protective cover is staggered with the energy arm after the injector is used, so that the protective cover is restored to the clamping state.

Drawings

Fig. 1 is an exploded view of the pre-filled syringe of the present invention.

Fig. 2 is a schematic structural view of the utility model with the middle sealing sleeve not taken down and the protective cover located at the far end of the syringe.

Fig. 3 is a schematic structural view of the utility model with the middle sealing sleeve not removed.

Fig. 4 is a schematic structural view of the sealing sleeve taken down in the present invention.

Fig. 5 is a schematic structural view of the utility model with the middle sealing sleeve removed and the protective cover located at the far end of the syringe.

Fig. 6 is a schematic cross-sectional view along line AA in fig. 2.

Fig. 7 is an enlarged schematic view of fig. 6.

Fig. 8 is an enlarged schematic view of fig. 7.

Fig. 9 is a schematic structural view of the protective cover unit of the present invention.

Fig. 10 is a schematic structural view of the middle guide groove portion of the present invention.

Fig. 11 is a schematic structural diagram of the rotation limiting unit of the present invention.

Fig. 12 is a schematic structural diagram of the middle stopper unit of the present invention.

Fig. 13 is the utility model discloses well stopper unit cup joints the schematic structure on needle installation pipe.

In the drawings, the reference numerals denote the following components: the stopper unit 1, the protective cover unit 2, the rotation stopper unit 3, the syringe 11, the needle mounting tube 12, the injection needle 13, the seal cover 14, the mounting ring 101, the stopper 102, the rotation stop inner ring surface 103, the protective cover 201, the stopper opening 202, the energy arm 203, the guide groove portion 204, the mold release window 205, the deformation groove 206, the mounting inclined surface 207, the indicator 208, the rotary ring 301, the guide block 302, the energy arm jack 303, the energy arm 203a, the locking straight surface 203b, the jack block 203c, the opening inclined surface 203d entering groove 204a, the first guide surface 204b, the second guide surface 204c, the third guide surface 204d, the fourth guide surface 204e, the fifth guide surface 204f, the exit groove 204g, the large rotary ring 301a, the small rotary ring 301b, the distal end inclined surface 302a, the proximal end inclined surface 302b, the rotation stop surface 12a, the rotation stop protrusion 12b, and the seal cover protrusion 14a.

Detailed Description

Definition of

1. Setting: means for welding, riveting, screwing, threading, etc. the two components are joined together.

2. Internal: refers to the side closer to the narrower or more open side; similarly, "outer" refers to closer to the side that is more open, or farther from the side that is more narrow.

3. Clamping: the finger part A is formed by pressing the inner side surface and/or the outer side surface of the finger part B, so that the finger part A and the finger part B are temporarily fixed together.

4. A far end: the finger is a component arranged on the needle cylinder, and is far away from one end of an opening of the needle cylinder installation push rod or one end close to the installation position of the injection needle; similarly, "proximal" refers to a component mounted on the barrel, either near the end of the barrel where the plunger is mounted, or away from the needle mounting location.

5. Axial direction: the direction of a straight line formed by extending infinitely along the direction of the injection needle.

6. Radial: refers to a linear direction along a diameter or radius, or a linear direction perpendicular to an axis.

7. Jacking: the first finger component exerts a force on the second component, so that the second component moves towards the direction opposite to the position of the first component.

The following description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. In addition, the terms "vertical", "horizontal", "top", "bottom", "front", "back", "up", "down", and the like in the embodiments of the present invention refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which the product is conventionally placed in use, only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

It is further noted that, unless expressly stated or limited otherwise, terms such as "mounted," "connected," "secured," and the like are intended to be construed broadly, and thus, for example, "connected" may be fixedly, releasably, or integrally connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example (b): as shown in fig. 1-13, a needle-protected prefilled syringe comprises: syringe 11, needle installation tube 12, injection needle 13, seal cover 14, wherein:

the needle installation tube 12 is arranged on the needle cylinder 11 and used for installing the injection needle 13, the needle cylinder 11, the needle installation tube 12, the injection needle 13 is in a communicating state, the sealing sleeve 14 is sleeved on the needle installation tube 12 and used for protecting the injection needle 13, and the needle installation device further comprises:

a stopper unit 1, the stopper unit 1 including a stopper 102 mounted on the needle mounting tube 12;

and the protective cover unit 2 comprises a sleeve joint part, the needle cylinder 11 and the protective cover 201 on the needle installation tube 12 and the injection needle 13 are sleeved on the protective cover unit 2, and the protective cover unit 2 is arranged on the protective cover 201 and used for clamping the limiting opening 202 of the limiting block unit 1.

In this embodiment, the prefilled syringe does not have a push rod and a piston when leaving the factory, but is directly delivered to a downstream manufacturer for drug filling, and then the piston is added, the syringe 11, the needle mounting tube 12, the injection needle 13, and the sealing sleeve 14 are necessary structures for achieving an injection function of the syringe in the prior art, and after the syringe 11, the needle mounting tube 12, the injection needle 13, and the sealing sleeve 14 are assembled, the prefilled syringe is installed in the following manner:

1. the stopper 102 is disposed on the needle mounting tube 12, and if the stopper 102 is a movable mounting structure, the stopper 102 is mounted on the needle mounting tube 12 first.

2. The protective cover 201 is sleeved on the needle cylinder 11, and the limit block 102 is clamped in the limit opening 202.

The usage mode of the pre-filling and sealing syringe is as follows:

1. pulling the protective cap 201 proximally along the barrel 11 to expose the sealing sleeve 14;

2. removing the gland 14 from the needle mounting tube 12 to expose the injection needle 13;

3. performing injection operation;

4. after the injection, the protective cap 201 is pushed distally along the barrel 11 until the injection needle 13 is completely covered.

The width of the protruding part of the limit block 102 is slightly smaller than the width of the limit opening 202, and the protection cover unit 2 can move along the needle cylinder 11 without rotating relative to the needle cylinder 11 when being inserted into the limit opening 202;

in addition, the friction force exists between the stopper 102 and the protection cover unit 2, so that the protection cover 201 is fixed in position without being manually pushed or pulled, does not slide to the far end during injection, and does not slide to the near end during protection of the injection needle 13.

In addition, can carry out the light inspection to the syringe when the syringe leaves the factory, the "light inspection" sees through the cylinder and passes through the manual observation mode in order to inspect whether qualified in syringe filling plus stopper, and most integral type safety covers in the market then can influence this process, for example the china utility model that the notice number is CN214911888U, the notice day is 2021-11-30 discloses a syringe needle protection device and safety syringe thereof, including overcoat, installation endotheca, spring, this kind of inside and outside cover ways has blockked the inside field of vision of cylinder, influences the light and examines the process, and in this embodiment, safety cover unit 2 has only covered under the syringe does not use condition needle installation pipe 12, and the process that the light was examined can not influenced to some distal end of cylinder 11.

In order that the protective cover 201 may automatically slide in the distal direction after an injection, when the operator releases his hand, the protective cover unit 2 further comprises: and the energy arm part 203 comprises an energy arm 203a, one end of which is arranged on the inner side surface of the far end of the limit opening 202, and the other end of which has elastic force along the radial direction inward of the protective cover 201.

When an operator pulls the protective cover 201 proximally, the stopper 102 jacks up the energy arm 203a radially outwards along the protective cover 201, so that the energy arm 203a stores energy, and the protective cover 201 has a tendency to move distally under the action of the energy arm 203a. After the injection finishes, the operator loosens both hands, energy arm 203a releases energy and acts on the stopper 102, causes the protection cover 201 to the distal end motion until covering completely syringe needle 13.

In order to lock the protective cap 201 and prevent the protective cap 201 from moving proximally again when the protective cap 201 is moved distally until the injection needle 13 is completely covered, the energy arm 203a further has a locking straight surface 203b at its proximal end for lifting up the stopper 102 to lock the relative position of the protective cap 201 and the injection needle 13. So that the needle 13 is not easily exposed when discarded.

When the locking straight surface 203b of the energy arm 203a just slides down to be engaged with the stopper 102, a "click" sound is generated to remind an operator that the protective cover 201 is completely engaged and can be discarded.

In order to make the energy storage process of the energy arm 203a smoother when the protective cover 201 is moved proximally, further, the energy arm 203 further includes a jack-up block 203c disposed at the proximal end of the energy arm 203a, when the protective cover 201 is moved proximally, the stopper 102 jacks up the energy arm 203a radially outward along the protective cover 201, and the jack-up block 203c also pushes against the outer wall of the syringe 11, so that the energy arm 203a receives a force radially outward along the protective cover 201, and the two forces push against and support the energy arm 203a to expand outward, so that the force receiving and expanding processes are more uniform.

Further, the proximal end of the jack-up block 203c has an opening slope 203d. When the lifting block 203c passes over the stopper 102, the opening inclined surface 203d can be wiped along the upper end of the stopper 102, and the passing process is easier.

In order to allow the jack-up block 203c to pass over the stopper 102 without intentionally pulling the energy arm 203a outward when the protective cap 201 is opened proximally, further, when the seal boot 14 is fitted to the needle mounting tube 12, the energy arm 203a or the jack-up block 203c is jacked up in the radial outward direction of the needle cylinder 11, so that the locking straight surface 203b is disengaged from the stopper 102.

This has the advantage that when the sealing boot 14 is sleeved on the needle mounting tube 12 to protect the injection needle 13, the protective cover 201 can move freely to the proximal end, and after the sealing boot 14 is pulled off the needle mounting tube 12, the protective cover 201 is reset to the distal end through the energy arm 203a, the energy arm 203a loses the support of the sealing boot 14, and then falls down, so that the locking straight surface 203b jacks up the stopper 102 to complete the locking, and in the whole process, an operator can complete the operation by one hand without intentionally pulling the energy arm 203a during the opening process.

In order to enable the protective cover 201 to be fixed after sliding towards the proximal end, further, the needle head protective 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 annular surface of the rotating ring 301, and the guide block 302 is provided with a distal inclined surface 302a and a proximal inclined surface 302b;

the protective cover unit 2 further includes a guide groove portion 204 including:

an entry groove 204a provided on an inner circumferential surface of the protective cover 201 and configured to receive the guide block 302;

the first guide surface 204b is positioned at the distal end side of the entering groove 204a, and when the protective cover 201 moves towards the proximal end, the first guide surface 204b is attached to the distal end inclined surface 302a to slide, so that the rotating ring 301 is driven to rotate;

a second guide surface 204c connected to the first guide surface 204b and configured to lift up the guide block 302 to block the rotation of the rotation ring 301;

the third guide surface 204d is arranged on an inner annular surface of the protection cover 201 and is located on the proximal end side of the second guide surface 204c, and when the protection cover 201 moves towards the distal end, the third guide surface 204d is attached to the proximal end inclined surface 302b and slides, so that the rotating ring 301 is driven to rotate;

a fourth guide surface 204e connected to the third guide surface 204d and configured to lift up the guide block 302 to block the rotation of the rotation ring 301;

the fifth guide surface 204f is disposed on the inner annular surface of the protection cover 201 and located on the distal side of the third guide surface 204d, and when the protection cover 201 moves towards the proximal end, the fifth guide surface 204f is attached to and slides on the distal inclined surface 302a, so as to drive the rotating ring 301 to rotate and enter the exit groove 204g disposed on the inner annular surface of the protection cover 201.

After the rotation limiting unit 3 and the guide groove part 204 are provided, the pre-filled syringe is used as follows:

1. pulling the protective cover 201 proximally along the needle cylinder 11 to expose the sealing sleeve 14, wherein the guide block 302 enters the entry groove 204a, the protective cover 201 is pulled proximally along the needle cylinder 11, the distal inclined surface 302a of the guide block 302 is fitted to and slides along the first guide surface 204b until the guide block 302 abuts against the second guide surface 204c to stop moving, and at this time, all the sealing sleeve 14 is exposed;

2. when the protective cover 201 is released, the protective cover 201 moves to the far end under the action of the energy arm 203a, the near end inclined surface 302b of the guide block 302 is jointed and slides along the third guide surface 204d until the guide block 302 stops moving against the fourth guide surface 204e, and the protective cover 201 is locked;

2. the sealing sleeve 14 is taken down from the needle mounting tube 12, the injection needle 13 is exposed, and the distance of the distal movement of the protective cover 201 does not influence the taking-out process of the sealing sleeve 14;

3. carrying out injection operation;

4. after the injection is completed, the protective cover 201 is pulled proximally along the needle cylinder 11, at this time, the distal inclined surface 302a of the guide block 302 engages and slides along the fifth guide surface 204f until the guide block 302 abuts against the groove surface of the exit groove 204g, or the maximum expansion distance of the energy arm 203a is reached to stop moving, at this time, the protective cover 201 is released, the energy of the energy arm 203a is released by the protective cover 201 to eject distally, at this time, the guide block 302 slides along the exit groove 204g until the locking straight surface 203b on the energy arm 203a engages with the stopper 102, and the protective cover 201 is locked.

The advantage of setting up rotation limiting unit 3, guide slot portion 204 lies in:

1. the operator can realize the steps 1 to 4 by pulling the protective cover 201 towards the proximal direction all the time, and the operator is far away from the injection needle 13 in the whole process, so that the risk of being punctured in the operation is effectively avoided;

2. the operation of pulling the protective cover 201 in the proximal direction is very simple, and only the thumb and the forefinger need to pull the protective cover 201 towards the palm center, so that an operator with short fingers can use the protective cover easily.

In actual production, the sealing sleeves for injection needles have different specifications, and some sealing sleeves with smaller specifications cannot completely jack up the energy arm 203a, so that in step 1, an operator still needs to use the other hand to lift the energy arm 203a to release the clamping effect on the stopper 102, and further, the rotation limiting unit 3 further comprises an energy arm jacking block 303 arranged on the rotating ring 301, and when the guide block 302 is located in the entry groove 204a, the energy arm jacking block 303 jacks up the energy arm 203a or the jacking block 203c along the radial direction of the protective cover 201, so that the locking straight surface 203b is disengaged from the stopper 102.

In step 1, the guide block 302 is located in the entry slot 204a, and the energy arm jacking block 303 just jacks up the energy arm 203a; in step 4, the guide block 302 is located in the exit slot 204g, and at this time, the rotating ring 301 has rotated by a certain angle, so that the energy arm jacking block 303 is staggered from the energy arm 203a, and thus the energy arm 203a can be engaged with the limiting block 102 to realize a locking function, which is a skillful design, and utilizes the position change of the guide block 302 to realize a function of unlocking the energy arm 203a before the use of the syringe.

The protective cover unit 2 further includes a release window 205 provided in the protective cover 201, and the release window 205 exposes a position of the guide groove portion 204 in an inner ring surface of the protective cover 201.

The function of the release window 205 is:

1. the protection cover unit 2 can conveniently provide a retraction space when being separated from the die in the demolding stage, so that cracking in demolding is avoided;

2. the operator can visually 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, so as to conveniently confirm whether the guide block 302 is in the correct engagement position.

The protective cover unit 2 further includes an installation inclined surface 207 which is provided at a proximal end of the protective cover 201 and which jacks up the stopper 102 when the protective cover 201 is fitted over the needle mounting tube 12, thereby expanding the proximal end of the protective cover 201 radially outward.

When the protective cover 201 is sleeved on the needle mounting tube 12, the protective cover needs to go over the limit block 102, and the limit block 102 is clamped into the limit opening 202. In this process, the proximal end of the protective cover 201 needs to be radially expanded to allow the stopper 102 to pass through, and the installation slope 207 is provided to make the process of passing the stopper 102 smoother.

Further, the protection cover unit 2 further comprises a deformation groove 206 disposed at the proximal end of the protection cover 201 and providing an expansion space when the proximal end of the protection cover 201 expands radially outward.

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

The outer side surface of the energy arm 203a is just a plane and can be used for arranging the display surface 203e, and the display surface 203e can be used for carving important information such as product models and built-in medicines.

The protective cover unit 2 further comprises an indicator 208 arranged on the outer side of the protective cover 201.

The indicator 208 is a pattern formed by a plurality of small protrusions and can be used for indicating an operator, and the direction of pulling the protective cover 201 is needed when the protective cover is used, so that misoperation of the operator who does not know how to use the protective cover is avoided.

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 at the proximal end, and the small rotating ring 301b is located at the distal end.

After the jacking blocks 203c on the energy arm 203a cross the limiting blocks 102, the rotating ring 301 is touched, and the risk of jamming exists, so that the rotating ring 301 is designed into a double-layer ring formed by a large rotating ring 301a and a small rotating ring 301b, the large ring is arranged at the near end, and the small ring is arranged at the far end, so that when the rotating ring 301 jacks the jacking blocks 203c of the energy arm 203a, the jacking blocks 203c cross the rotating ring 301 along the steps formed by the large rotating ring 301a and the small rotating ring 301b, and the jamming phenomenon is avoided.

The limiting block unit 1 comprises a mounting ring 101 sleeved on the needle mounting tube 12, and a limiting block 102 arranged on the mounting ring 101 and used for clamping the limiting opening 202.

The stopper unit 1 is directly arranged on the needle cylinder 11, the structure of the existing needle cylinder 11 can be changed, mass production is not facilitated, the stopper unit 1 is designed into a movable installation form, and therefore the installation ring 101 with a proper size can be prepared to be sleeved on the needle installation tube 12 according to the specification of the needle installation tube 12 on the existing needle cylinder 11, and installation of the stopper 102 is completed.

In order to avoid that the limiting block 102 rotates when in use, so that the whole protection cover unit 2 rotates along with the limiting block, and the clamping process is affected, the needle mounting tube 12 is provided with a rotation-stopping outer annular surface 12a, and the inner annular surface of the mounting ring 101 is provided with a rotation-stopping inner annular surface 103 matched with the rotation-stopping outer annular surface 12 a.

The needle mounting tube 12 further includes a stopper projection 12b for engaging with the rotating ring 301.

As shown in fig. 8, when the rotating ring 301 is fitted over the needle mounting tube 12, it passes over the stop protrusion 12b and is engaged between the stop protrusion 12b and the distal end surface of the cylinder 11, so that the rotating ring 301 can only rotate and cannot move axially along the cylinder 11.

The needle head protection type pre-filling and sealing needle cylinder assembly is characterized by comprising a push rod and a piston; wherein:

the push rod is arranged on the piston;

the plunger is installed in the syringe 11 and pushes the plunger in a distal direction to push out the medical solution through the needle 13.

A method of mounting a component, comprising the steps of:

s1, the needle protection sleeve 14 is axially installed in the protection cover 101;

s2, sleeving the protective cover 101 with the needle protective sleeve 14 on the needle mounting piece 12 along the axial direction;

s3, pushing the piston into the injection needle cylinder 11;

s4, arranging the push rod on the piston.

A method of using an assembly, comprising the steps of:

s1, axially moving the protective cover 101 along the proximal direction of the injection syringe 11 until one side of the back surface of the hook of the elastic hook 202 abuts against the distal side surface of the sliding port 102, so as to expose the needle protective sleeve 14;

s2, opening the needle protective sleeve 14 to expose the injection needle 13;

s3, performing injection operation;

and S4, after the injection operation is finished, axially moving the protective cover 101 along the far end direction of the injection needle cylinder 11 until one side of the hook of the elastic hook 202 hooks the near end side face of the sliding opening 102, so as to completely cover the injection needle 13.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. These are non-inventive modifications and are intended to be protected by the following claims.

Claims (17)

1. A needle-protected pre-filled syringe comprising: syringe (11), needle installation pipe (12), syringe needle (13), seal cover (14), wherein:

needle installation pipe (12) set up on syringe (11), and be used for the installation syringe needle (13), syringe (11), needle installation pipe (12), syringe needle (13) are in the intercommunication state, seal cover (14) cup joint on needle installation pipe (12), and be used for the protection syringe needle (13), its characterized in that still includes:

a stopper unit (1), the stopper unit (1) including a stopper (102) mounted on the needle mounting tube (12);

the safety protection cover unit (2), safety protection cover unit (2) is including cup jointing part safety protection cover (201) on needle installation pipe (12) and syringe needle (13), and set up on safety protection cover (201), and be used for the block spacing mouth (202) of stopper (102).

2. A needle-protected pre-filled syringe according to claim 1, wherein the protective cover unit (2) further comprises:

and the energy arm part (203), wherein the energy arm part (203) comprises an energy arm (203 a) with one end arranged on the inner side surface of the far end of the limiting opening (202) and the other end with elastic force inwards along the radial direction of the protective cover (201).

3. A needle-protected pre-filled and sealed syringe according to claim 2, wherein the energy arm (203 a) has a straight locking surface (203 b) at the proximal end thereof for jacking up the stopper (102) to lock the relative position of the protective cover (201) and the injection needle (13).

4. A needle-protected pre-filled and sealed syringe according to claim 3, wherein said energy arm (203) further comprises a jack block (203 c) disposed at the proximal end of said energy arm (203 a), said jack block (203 c) having an opening bevel (203 d) at the proximal end.

5. A needle-protected pre-filled and sealed syringe according to claim 4, wherein when the sealing sleeve (14) is sleeved on the needle mounting tube (12), the energy arm (203 a) or the jacking block (203 c) is jacked up along the radial outward direction of the syringe (11), so that the locking straight surface (203 b) is disengaged from the limiting block (102).

6. A needle-protected pre-filled and sealed syringe according to claim 4, further comprising a rotation limiting unit (3), wherein the rotation limiting unit (3) comprises a rotation ring (301) sleeved on the needle mounting tube (12), and a guide block (302) arranged on the outer annular surface of the rotation ring (301), the guide block (302) has a distal end inclined surface (302 a) and a proximal end inclined surface (302 b);

the protective cover unit (2) further comprises a guide groove portion (204) comprising:

an inlet groove (204 a) which is arranged on the inner annular surface of the protective cover (201) and is used for installing the guide block (302);

the first guide surface (204 b) is positioned on the distal end side of the entering groove (204 a), and when the protective cover (201) moves towards the proximal end, the first guide surface (204 b) is attached to the distal end inclined surface (302 a) to slide, so that the rotating ring (301) is driven to rotate;

a second guide surface (204 c) connected to the first guide surface (204 b) and configured to lift up the guide block (302) to block the rotation of the rotating ring (301);

the third guide surface (204 d) is arranged on the inner ring surface of the protective cover (201) and is positioned on the near end side of the second guide surface (204 c), and when the protective cover (201) moves towards the far end, the third guide surface (204 d) is attached to the near end inclined surface (302 b) and slides, so that the rotating ring (301) is driven to rotate;

a fourth guide surface (204 e) connected to the third guide surface (204 d) and configured to lift up the guide block (302) to block the rotation of the rotating ring (301);

fifth spigot surface (204 f), set up on safety cover (201) inner ring surface, and be located third spigot surface (204 d) distal end side, when safety cover (201) moved to the near-end, make fifth spigot surface (204 f) and distal end inclined plane (302 a) laminating slip, thereby drive swivel (301) is rotatory, gets into to set up withdrawal groove (204 g) on the safety cover (201) inner ring surface.

7. A needle-protected pre-filled and sealed syringe according to claim 6, characterized in that the rotation-limiting unit (3) further comprises an energy-arm-jacking block (303) provided on the rotation ring (301), when the guide block (302) is located in the entry groove (204 a), the energy-arm-jacking block (303) jacks up the energy arm (203 a) or the jacking block (203 c) radially outwards along the protective cover (201), so that the locking straight surface (203 b) is disengaged from the limiting block (102).

8. A needle-protected pre-filled and sealed syringe according to claim 6, characterized in that the protective cover unit (2) further comprises a demolding window (205) provided on the protective cover (201), the demolding window (205) exposing the position of the guide groove portion (204) in the inner annular surface of the protective cover (201).

9. A spike protected pre-filled and sealed barrel according to claim 1, wherein said shield unit (2) further comprises a mounting ramp (207) disposed at a proximal end of said shield (201) and adapted to jack up said stopper (102) when said shield (201) is fitted over said needle mounting tube (12) so as to expand said shield (201) proximal end radially outwardly.

10. A needle-protected pre-filled and sealed syringe according to claim 1, wherein the protective cover unit (2) further comprises a deformation groove (206) provided at the proximal end of the protective cover (201) and providing an expansion space when the proximal end of the protective cover (201) is expanded radially outwards.

11. A needle-protected pre-filled syringe as claimed in claim 3, characterised in that the outer side of the energy arm (203 a) is provided with a display surface (203 e) for printing a design.

12. A needle-protected pre-filled syringe according to claim 1, characterised in that the protective cover unit (2) further comprises an indicator (208) arranged on the outer side of the protective cover (201).

13. A needle-protected pre-filled and sealed syringe according to claim 6, wherein said rotating ring (301) is composed of a large rotating ring (301 a) and a small rotating ring (301 b), said large rotating ring (301 a) being located at the proximal end and said small rotating ring (301 b) being located at the distal end when said rotating ring (301) is fitted over said needle mounting tube (12).

14. A needle head protection type pre-filled and sealed syringe according to claim 1, wherein said stopper unit (1) further comprises a mounting ring (101) sleeved on said needle mounting tube (12), and said stopper (102) is mounted on said needle mounting tube (12) by means of being disposed on said mounting ring (101).

15. A needle-protected prefilled syringe as claimed in claim 14, wherein said needle mounting tube (12) is provided with an outer rotation-stop surface (12 a), and said mounting ring (101) is provided with an inner rotation-stop surface (103) on the inner surface thereof, said inner rotation-stop surface being complementary to said outer rotation-stop surface (12 a).

16. A needle-protected pre-filled and sealed syringe according to claim 6, wherein said needle mounting tube (12) further comprises a stop protrusion (12 b) for engaging said rotary ring (301).

17. An assembly comprising the needle head protective pre-encapsulated syringe of claims 1-16, characterized by comprising a push rod and a piston; wherein:

the push rod is arranged on the piston;

the piston is arranged in the injection syringe (11) and is used for pushing out the liquid medicine through the injection needle (13) when pushing the push rod towards the far end direction.

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