CN211157867U - Needle-stick injury prevention protection device for injector - Google Patents

Abstract

The utility model belongs to the technical field of clinical utensil, concretely relates to syringe is with preventing that acupuncture hinders protection device. The utility model discloses a: the axial telescopic air bag and the pressing air bag are connected with each other through a connecting air pipe, so that the axial telescopic air bag can generate follow-up axial expansion action when the pressing air bag is pressed; the front end of the protective sleeve is provided with a sealing plate which is used for sealing the groove end at the front end of the protective sleeve and can shield the needle point of the needle when the axial expansion air bag generates axial expansion action. The utility model discloses possess the advantage that one hand can be operable, can realize preventing that the needle pricks the operation of hindering in step when the syringe finishes using, it is very high-efficient convenient to use.

Description

Needle-stick injury prevention protection device for injector

Technical Field

The utility model belongs to the technical field of clinical utensil, concretely relates to syringe is with preventing that acupuncture hinders protection device.

Background

The needle stick injury refers to an accidental injury phenomenon caused by being pricked by various needles such as injection needles, puncture needles, suture needles and the like. In hospitals, needle stick injuries have strong harmfulness and serious consequences, can cause the spread of various blood-borne diseases, and are particularly frequently used in the field of clinical injection. At present, the injection in hospitals is a disposable syringe, and the syringe can be sleeved with a plastic sleeve at the needle head after the assembly is completed, so that the aim of preventing unnecessary injury caused by medical personnel when taking the syringe is fulfilled. However, in practice, the medical staff does not worry about the needle stick injury condition of the needle when taking the syringe, because the needle does not contact the body fluid of the patient yet, the hazard does not exist. What medical personnel worried about, it is also common in the field of clinical injection, is the needle stick injury condition that may occur when pulling out the needle and handling the needle: at the moment, the needle head is polluted by body fluid of a patient, once a needle stick injury occurs, wound bleeding and suppuration are often caused, and infection problems are caused due to disease sources such as Acquired Immune Deficiency Syndrome (AIDS) and hepatitis B in body fluid of the patient, so that the safety of medical care personnel is seriously harmed finally. Although some devices for preventing needle-stick injuries exist at present, such as a disposable hypodermic syringe with a retractable needle head in the invention name of Chinese patent publication No. CN1049285A and a safety needle in the invention name of Chinese patent publication No. CN1777453A, the structures for preventing needle-stick injuries generally have a commonality, that is, only considering the prevention of needle-stick injuries, and neglecting the use cost and the use convenience. The traditional disposable syringe is widely used up to now, the cost performance is optimized, and at the moment, if the integrated needle-stick injury prevention structure is added, the use cost is increased sharply, and the cost is increased and is transferred to a patient, so that the economic benefit of the patient is harmed. In addition, no matter what the existing needle-prick prevention structure is, the syringe needs to be operated by two hands after being used, and the whole needle-prick prevention flow cannot be completed by one hand, which brings much trouble to the popularization and application of the needle-prick prevention structure.

Disclosure of Invention

The utility model aims at overcoming the not enough of above-mentioned prior art, provide a needle-prick prevention protection device for syringe rational in infrastructure and practical, it possesses the one-hand advantage that is operable, can realize the needle-prick prevention operation of hindering of syringe needle in step when the syringe finishes using, and it is very high-efficient convenient to use.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a syringe is with preventing that acupuncture hinders protection device which characterized in that: the device comprises:

post-fixing clip: the rear fixing clamp is radially clamped and fixed at the rear end of the hollow cylinder of the syringe; the pressing air bag is fixed on the outer wall of one of the clamp bodies of the rear fixing clamp;

front fixing clamp: the front fixing clamp is radially clamped and fixed at a pintle of the injector, and the rear end of the axial telescopic air bag is fixedly connected at one of the clamp bodies of the front fixing clamp; the shape of the axial telescopic air bag is in a U-shaped groove type corrugated bag shape, the direction of a notch of the U-shaped groove type corrugated bag shape is consistent with the direction of an opening of the front fixing clamp, and the telescopic direction of the axial telescopic air bag is parallel to the axis direction of a needle head of the syringe; the axial telescopic air bag and the pressing air bag are connected with each other through a connecting air pipe, so that the axial telescopic air bag can generate follow-up axial expansion action when the pressing air bag is pressed;

protecting sleeve: the protective sleeve is in a U-shaped plate shape, and the rear end of the protective sleeve is fixedly connected with the front end of the axial telescopic air bag; the front end of the protective sleeve is provided with a sealing plate which is used for sealing the groove end at the front end of the protective sleeve and can shield the needle point of the needle when the axial expansion air bag generates axial expansion action.

Preferably, the outer wall of the rear end of the protective sleeve is in a stepped shaft shape, and a small shaft diameter section of the outer wall of the rear end of the protective sleeve is radially and convexly provided with a positioning salient point; the front end of the axial telescopic air bag is concavely provided with a stepped hole matched with the appearance of the rear end of the protective sleeve, and the large-aperture section of the stepped hole corresponds to the positioning salient point and is provided with a matching concave hole, so that the protective sleeve can be fixed on the axial telescopic air bag along the axial direction in a tenon-and-mortise detachable manner.

Preferably, a layer of colloid cushion layer for the needle tip of the needle to prick is padded on the inner side plate surface of the sealing plate.

Preferably, the sealing plate is concavely provided with a sliding groove for generating axial guiding sliding action along the surface of the needle stem, and the direction of the groove opening of the sliding groove and the direction of the groove opening of the protective sleeve are in the same direction.

Preferably, one of the clamp bodies of the rear fixing clamp extends to the needle point direction along the axial direction of the hollow cylinder to form an arc-shaped fixing plate; the pressing air bag is of an arc corrugated bag structure which can generate axial compression action along the pulling-out direction of the piston handle of the injector, and a surface-fitting type guiding fit relation is formed between the inner arc surface of the pressing air bag and the outer plate surface of the arc fixing plate; one end of the pressing air bag attached to the barrel wing of the injector is used as the rear end of the pressing air bag, and the connecting air pipe extends into the connecting air bag through the rear end of the pressing air bag so as to communicate the bag cavity of the pressing air bag with the bag cavity of the axial telescopic air bag.

Preferably, the hollow air passages are preset in the arc-shaped fixing plate, the clamp body of the rear fixing clamp where the arc-shaped fixing plate is located and the corresponding clamp body of the front fixing clamp located at the same side of the arc-shaped fixing plate, the front end of the tube cavity of the connecting air pipe is communicated with the axially telescopic air bag cavity through the hollow air passage in the front fixing clamp, and the rear end of the tube cavity of the connecting air pipe is communicated to the pressing air bag cavity through the hollow air passage of the fixing arc plate and the air passage in the clamp body of the rear fixing clamp after axially extending through the hollow cylinder.

Preferably, the outer wall of the front end of the pressing air bag is concavely provided with a concave cambered surface-shaped pressing notch which is convenient for a thumb to apply force backwards to poke the pressing air bag.

Preferably, a T-shaped guide rail is convexly arranged on the outer side plate surface of the arc-shaped fixing plate, and dovetail grooves are correspondingly arranged at the front end and the rear end of the pressing air bag so as to form a guiding fit relation between the pressing air bag and the T-shaped guide rail, wherein the guiding direction is the pressing direction of the pressing air bag.

The beneficial effects of the utility model reside in that:

1) the traditional syringe needle-prick preventing structure which is complicated in structure and needs to be operated by two hands is abandoned. The utility model is used for installing the pressing air bag by taking the later fixing clamp as the operation base body close to the hand of the operator; previously the retaining clip served as a mounting base near the needle tip for mounting an axially telescoping balloon. When the current fixing clamp is clamped in the position of the needle head pintle, the axial telescopic air bag is naturally enabled to form an accommodating cavity for the needle head needle stalk to extend out due to the inherent U-shaped corrugated bag body structure. And when the operator uses the syringe and one hand is pressing the puncture point of the patient with a cotton swab or the like, the other hand only needs to pull out the syringe, and the other hand directly uses one hand to press down with a thumb or an index finger while pinching the syringe so as to pinch the air bag to be shriveled, so that the air in the air bag is pressed into the axial telescopic air bag through the connecting air pipe. The axial flexible gasbag admits air and follows syringe needle stalk length direction expansion back, can make the protective sheath that is located axial flexible gasbag front end department directly slide into syringe needle point department under the expanding force effect of axial flexible gasbag to the realization is to the cladding formula protection purpose of syringe needle point. And then, even if the pressing air bag is not pressed any more, the axial telescopic air bag can not generate retraction action in the presence of the sealing plate, and the purpose of conveniently preventing the needle from being punctured under the operation of one hand is realized.

Therefore, the utility model has the advantages of simple and fast operation, all the anti-needle-prick operation flows can be performed by one hand, the operation of holding the syringe by the hand and other actions of the other hand can not be influenced, and the clinical use is facilitated.

2) In a further preferred embodiment of the above aspect, the protector is substantially detachable from the axially stretchable airbag. The above structure is adopted, and the reusability of the utility model is considered. During actual operation, in case the syringe needle point has been hung to the protective sheath, then only need follow the syringe needle axial and the flexible gasbag of reverse pulling axial for the flexible gasbag of axial resets, and the flexible gasbag department of axial cooperates the shrinkage pool and throw off each other with the location bump of protective sheath department this moment, can leave over the protective sheath in syringe needle point department. Of course, the protective cover should be disposed on the protective cover, preferably a rubber cushion, so as to cover the needle tip without touching the needle tip with hands, thereby preventing needle prick. And when the axial telescopic air bag resets the back, the interior gas of axial telescopic air bag can flow back to in pressing the air bag, takes off from the syringe this moment the utility model discloses to wait that the new protective sheath of next installation and reuse, the price/performance ratio is high.

3) When the axial telescopic air bag is in the initial position, the protective sleeve is actually sleeved on the needle stem of the needle head by the radial elasticity of the axial telescopic air bag. For guaranteeing the protective sheath along the axial direction guidance quality of syringe needle, the utility model discloses the spout has been arranged in shrouding department to utilize the direction function of the relative needle stalk of spout, ensure that the protective sheath can be under the expansion extension action of the flexible gasbag of axial, thereby accurate earlier follow the syringe needle axis action again along the syringe needle radial action finally the card go into syringe needle point position department, its operational reliability and job stabilization nature can effectively be guaranteed.

4) For the compression balloon, it is preferable to use a bellows-shaped compression balloon structure. Pressing the gasbag and arranging in arc fixed plate department, utilized arc cooperation between them on the one hand, realized pressing the action direction purpose to a certain extent of gasbag to when pressing the gasbag pressurized, can realize directional shrink function under the cooperation direction of the outside face of self ripple construction and arc fixed plate. On the other hand, the pressing air bag gives out air when being reversely pressed, and also accords with the human engineering. In case the operator has used the syringe after, directly vacate the reverse gasbag of pressing of colluding of thumb or forefinger, the fixed back fixing clip who presses the gasbag this moment can ensure to press the gasbag and can completely bear operator's application of force action owing to the section of thick bamboo wing by the syringe is spacing, in order to ensure the utility model discloses an operation reliability.

5) The axial telescopic air bag is communicated with the bag cavity of the pressing air bag, and the utility model is realized by connecting an air pipe. Through linking up each other of connecting trachea and cavity air flue, can ensure that the air current circulates each other between pressing gasbag and the flexible gasbag of axial, in order to guarantee the utility model discloses an use reliability and reuse nature.

6) The pressing notch is arranged, so that when the thumb or the forefinger hooks the pressing air bag reversely, the force application of an operator can be facilitated. As a preferred scheme, a "T" type guide rail may also be convexly disposed at the outer plate surface of the arc-shaped fixing plate, and dovetail grooves are correspondingly disposed at the front end and the rear end of the pressing air bag so as to form a guiding fit relationship between the pressing air bag and the "T" type guide rail, where the guiding direction is the pressing direction of the pressing air bag, so as to implement the precise guiding function of the pressing air bag, which is not described herein again.

Drawings

FIGS. 1-2 and 4 are flow charts of the present invention in use;

FIG. 3 is an enlarged view of a portion I of FIG. 2;

fig. 5 is a partial cross-sectional view of a top view of the present invention in the state shown in fig. 1;

FIG. 6 is a partial enlarged view of portion II of FIG. 5;

fig. 7 is a partially enlarged view of a portion III of fig. 5.

The utility model discloses each reference numeral is as follows with the actual corresponding relation of part name:

a-hollow air passage b-needle tip c-needle stem d-needle plug e-hollow cylinder f-piston handle

10-rear fixing clip 11-pressing air bag 11 a-pressing notch 12-arc fixing plate

20-front fixing clip 21-axial expansion air bag

30-connecting trachea

40-protective sleeve 41-closing plate 41 a-sliding groove

42-small axial diameter section 42 a-positioning salient point 43-colloid cushion layer

Detailed Description

For the purposes of understanding, the specific structure and operation of the invention is set forth in the following description in connection with the accompanying drawings:

the structure of a general syringe is first described as follows: the structure of a common syringe generally comprises a nipple, an empty cylinder e containing scale marks, a piston shaft, a piston handle f and a needle head. The needle head comprises a needle point b, a needle stem c and a needle plug d which are arranged in sequence from front to back. When in use, the needle head and the hollow cylinder e are fixedly connected with each other through the axial insertion and matching of the needle bolt d relative to the nipple.

On the basis of the structure of the above-mentioned conventional syringe, the specific structure of the present invention is shown with reference to fig. 1-6, and the main structure thereof includes four major components, namely: the air bag type air bag fixing device comprises a rear fixing clamp 10 with a pressing air bag 11, a front fixing clamp 20 with an axial telescopic air bag 21, a connecting air pipe 30 for connecting the pressing air bag 11 and the axial telescopic air bag 21, and a protective sleeve 40 detachably and fixedly connected to the axial telescopic air bag 21. Wherein:

the rear fixing clip 10 has a contour identical to that of the front fixing clip 20 and serves as a clamp member with respect to a cylinder to achieve the purpose of quick radial clamping and fixing with respect to the hollow cylinder e and the pintle d when necessary. Once the rear fixing clip 10 is clipped at the empty cylinder e and the front fixing clip 20 is clipped at the pintle d, the position constancy of the pressing air bag 11 and the axial telescopic air bag 21 on the rear fixing clip 10 and the front fixing clip 20 can be ensured by the elastic clipping force of the rear fixing clip 10 and the front fixing clip 20. Meanwhile, as shown in fig. 1, the right end, that is, the rear end of the rear fixing clip 10 abuts against the tube wing of the empty tube e, and when the pressing air bag 11 is pressed, the rear fixing clip 10 generates an action force in the direction of the tube wing; the rear end of the front fixing clip 20 abuts against the front end face of the hollow tube e, so that the operating force of the axial expansion air bag 21 in the direction of the hollow tube e is stably cancelled, and the position constancy of the pressing air bag 11 and the axial expansion air bag 21 can be further ensured.

The outer walls of the caliper body on the same side of the rear fixing clip 10 and the front fixing clip 20 are fixedly connected with a pressing air bag 11 and an axial telescopic air bag 21 correspondingly. As shown in fig. 1-5 and 7, the pressing air bag 11 is shaped like an arc bellows type bag, and the self-oriented guiding action is ensured by the matching of a T-shaped guide rail and a dovetail groove and the arc structure of an arc fixing plate 12. In actual operation, the pressing airbag 11 is caused to produce a compressing action in the direction of extraction of the piston shank f by the thumb pressing down the pressing notch 11a at the front end of the pressing airbag 11 as shown in fig. 1. In the case of the axially expanding and contracting air bag 21, the configuration thereof, as shown in fig. 1 to 6, presents a bellows-like shape with the notches pointing in a "U" groove shape coinciding with the opening orientation of the front fixing clip 20. The U-shaped groove structure is adopted, so that after the current fixing clamp 20 is clamped into the needle bolt d along the radial direction of the needle head, the axial telescopic air bag 21 can naturally and radially fall into the needle stem c, and the positioning and covering function of the protective sleeve 40 relative to the needle point b can be realized when the axial telescopic air bag 21 expands and extends in the later period.

The protective sheath 40 is intended to be used as a disposable article, as a direct contact with the contaminated needle tip b. The rear end of the protective sleeve 40 is in a step structure as shown in fig. 2-3, and the positioning salient point 42a at the small-shaft-diameter section 42 is matched with the tenon-and-mortise of the matched concave hole, so that the purposes of clamping in the axial direction and convenient detachment are achieved. To achieve a reliable covering protection of the protective sheath 40 with respect to the needle point b, as shown in fig. 3 and 6, a sealing plate 41 with a sliding groove 41a is first disposed at the front end of the protective sheath 40, and a rubber pad 43 is disposed at the inner side surface of the sealing plate 41 for inserting and fixing the needle point b. When the axially expanding and contracting air bag 21 is in the state shown in fig. 1, the protection sleeve 40 can be in the upwarp state shown in fig. 1 because no gas is in the axially expanding and contracting air bag 21. When the axial expansion bladder 21 is inflated, as shown in fig. 2, the axial expansion bladder 21 is inflated, so that the protective sheath 40 performs an axial action along the needle and a radial snap-down action at the needle point, so that the sealing plate 41 snaps into the position right in front of the needle point as shown in fig. 3.

For further understanding the utility model discloses, this gives the utility model discloses a concrete work flow as follows:

1) when using the utility model discloses the time, at first demolish the syringe packing, after assembling the syringe, will the utility model discloses a radial card of preceding fixed clamping 20 is gone into pintle d department to the rear end of ensuring preceding fixed clamping 20 supports and leans on terminal surface department before empty section of thick bamboo e. And then the rear fixing clamp 10 of the utility model is radially clamped into the empty cylinder e, and the rear end of the rear fixing clamp 10 is ensured to be abutted against the cylinder wing of the empty cylinder e. During installation, attention needs to be paid to the smoothness of the air passage connecting the air pipe 30 with the hollow air passage a and the correspondingly communicated capsule cavity.

2) When the axial expansion air bag 21 is in the initial contraction state, the axial expansion air bag is far away from the needle point b, so that no safety hazard exists. At this time, the front end of the axial telescopic airbag 21 can be slightly lifted up and clamped into the protective sleeve 40, so that the positioning salient point 42a at the protective sleeve 40 and the matching concave hole at the front end of the axial telescopic airbag 21 can reliably form mortise-tenon joint. Of course, the protective sheath 40 can also be mounted directly on the axially expanding bladder 21 during step 1), and then the front fixing clip 20 can be fixed with respect to the pintle d. At this time, the slide groove 41a of the protective cover 40 is naturally clamped into the needle stem c, and the state is formed as shown in fig. 1 and fig. 5-7.

3) After the injector is used and the needle is pulled out, an operator holds the disinfection cotton swab with one hand to disinfect the puncture point on the skin of the patient and presses to stop bleeding. The other hand of the operator keeps the action of clamping the hollow cylinder e by the index finger and the middle finger when pulling the needle, naturally moves the thumb which originally presses the piston handle f forward to the pressing notch 11a of the pressing air bag 11 and applies force reversely, and at the moment, the palm of the operator naturally props against the piston handle f. Then, the gas in the pressing air bag 11 is filled into the axial expansion air bag 21 through the connecting air tube 30 and the hollow air passage a, and the axial expansion air bag 21 is expanded, so that the protective sleeve 40 moves to the needle point b. Meanwhile, the protective sheath 40 will act radially when it reaches the needle point b under the elastic force of the expanded axially expanding balloon 21, so that the final position of the protective sheath 40 is as shown in fig. 2-3. Then, the operator releases the pressing of the pressing air bag 11, the pressing air bag 11 will generate partial reset under the structure of the own bellows, so that the axial expansion air bag 21 generates partial contraction, at this time, the protection sleeve 30 will retract along the needle synchronously until the rubber cushion layer 43 at the sealing plate 41 is slowly embedded into the needle point b under the contraction action of the axial expansion air bag 21.

4) And when the syringe with the utility model is carried to the abandonment of medical articles, the needle head needs to be pulled out and the separation operation of the needle head and the nipple at the empty cylinder e is realized, so that the needle head is lost into the special sharp instrument box. At this time, the operator pulls back the axially expanding balloon 21 in the axial direction of the needle, so that the axially expanding balloon 21 returns to the initial contracted state. Under the force of external force of an operator, the positioning salient point 42a at the protective sleeve 40 and the matching concave hole at the front end of the axial telescopic air bag 21 are naturally separated, and the axial telescopic air bag 21 is separated from the protective sleeve 40 and retracts; meanwhile, the protective sleeve 40 makes the rubber cushion 43 at the sealing plate 41 go deeper to fix the needle point b by the axial tension of the axial expansion air bag 21. Thus, even if the axially-extendable bladder 21 is detached from the protector 40, the protector 40 can cover the needlepoint b independently, which corresponds to automatically pressing the "safety cap" on the needlepoint b. When axial flexible gasbag 21 is compressed to initial condition, the interior gas of axial flexible gasbag 21 can flow back to pressing in the gasbag 11 via connecting trachea 30 for press the gasbag 11 and expand to original state again, this moment the utility model discloses an operating condition makes reference to and is shown in figure 4.

5) And the operator takes off the utility model discloses to take off the syringe needle that has protective sheath 40 from empty section of thick bamboo e and throw into sharp machine box in, throw into other medical waste treatment incasement with syringe other parts, in order to accord with medical waste management requirement. Subsequently, the utility model is cleaned and sterilized, and a new protective sleeve 40 is replenished and installed before the next reuse, so that the utility model can be used repeatedly.

Claims (8)

1. The utility model provides a syringe is with preventing that acupuncture hinders protection device which characterized in that: the device comprises:

rear fixing clip (10): the rear fixing clamp (10) is radially clamped and fixed at the rear end of the hollow barrel of the syringe; the pressing air bag (11) is fixed on the outer wall of one of the clamp bodies of the rear fixing clamp (10);

front fixing clip (20): the front fixing clamp (20) is radially clamped and fixed at a pintle of the syringe, and the rear end of the axial telescopic air bag (21) is fixedly connected to one of clamp bodies of the front fixing clamp (20); the shape of the axial telescopic air bag (21) is in a U-shaped groove type corrugated bag shape, the direction of a notch of the U-shaped groove type corrugated bag shape is consistent with the direction of an opening of the front fixing clamp (20), and the telescopic direction of the axial telescopic air bag (21) is parallel to the axis direction of a needle head of the syringe; the axial telescopic air bag (21) and the pressing air bag (11) are connected with each other through a connecting air pipe (30), so that the axial telescopic air bag (21) can generate follow-up axial expansion action when the pressing air bag (11) is pressed;

protective sheath (40): the protective sleeve (40) is in a U-shaped plate shape, and the rear end of the protective sleeve (40) is fixedly connected with the front end of the axial telescopic air bag (21); the front end of the protective sleeve (40) is provided with a sealing plate (41) which is used for sealing the groove end at the front end of the protective sleeve (40) and can shield the needle point of the needle when the axial expansion air bag (21) generates axial expansion action.

2. A needle stick injury prevention device for a syringe as defined in claim 1, wherein: the outer wall of the rear end of the protective sleeve (40) is in a stepped shaft shape, and a small shaft diameter section (42) of the outer wall of the rear end of the protective sleeve (40) is radially and convexly provided with a positioning salient point (42 a); the front end of the axial telescopic air bag (21) is concavely provided with a stepped hole matched with the appearance of the rear end of the protective sleeve (40), and a large-aperture section of the stepped hole corresponds to the positioning salient point (42a) and is provided with a matching concave hole, so that the protective sleeve (40) can be fixed on the axial telescopic air bag (21) along the axial direction in a tenon-and-mortise detachable manner.

3. A needle stick injury prevention device for a syringe as defined in claim 2, wherein: a layer of colloid cushion layer (43) for the needle tip of the needle to insert is padded on the inner side plate surface of the closing plate (41).

4. A needle stick injury prevention device for a syringe as defined in claim 3, wherein: the sealing plate (41) is concavely provided with a sliding groove (41a) used for generating axial guiding sliding action along the surface of the needle stem, and the direction of the notch of the sliding groove (41a) is the same as the direction of the notch of the protective sleeve (40).

5. A needle stick-resistant protection device for a syringe as claimed in claim 1, 2, 3 or 4, wherein: an arc-shaped fixing plate (12) extends from one of the clamp bodies of the rear fixing clamp (10) along the axial direction of the hollow cylinder to the needle point direction; the pressing air bag (11) is of an arc-shaped corrugated bag structure which can generate axial compression action along the pulling-out direction of a piston handle of the injector, and a surface-fitting type guiding fit relation is formed between the inner side arc surface of the pressing air bag (11) and the outer side plate surface of the arc-shaped fixing plate (12); one end of the pressing air bag (11) attached to the barrel wing of the syringe is taken as the rear end of the pressing air bag (11), and the connecting air pipe (30) extends into the rear end of the pressing air bag (11) so as to communicate the bag cavity of the pressing air bag (11) with the bag cavity of the axial telescopic air bag (21).

6. A needle stick injury prevention device for a syringe as defined in claim 5, wherein: the clamp body of the rear fixing clamp (10) where the arc-shaped fixing plate (12) and the arc-shaped fixing plate (12) are located and the corresponding clamp body of the front fixing clamp (20) located on the same side of the arc-shaped fixing plate (12) are internally provided with hollow air passages (a), the front end of a tube cavity of the connecting air pipe (30) is communicated with an axial telescopic air bag (21) bag cavity through the hollow air passages (a) in the front fixing clamp (20), and the rear end of the tube cavity of the connecting air pipe (30) is communicated to the bag cavity of the pressing air bag (11) through the hollow air passages (a) of the fixing arc plate and the air passages (a) in the clamp body of the rear fixing clamp (10) respectively after being axially extended through the hollow cylinder.

7. A needle stick injury prevention device for a syringe as defined in claim 5, wherein: the outer wall of the front end of the pressing air bag (11) is concavely provided with a concave cambered surface-shaped pressing notch (11a) which is convenient for a thumb to apply force backwards to poke the pressing air bag (11).

8. A needle stick injury prevention device for a syringe as defined in claim 5, wherein: a T-shaped guide rail is convexly arranged on the outer side plate surface of the arc-shaped fixing plate (12), and dovetail grooves are correspondingly arranged at the front end and the rear end of the pressing air bag (11) so as to form a guiding fit relation with the T-shaped guide rail, wherein the guiding direction is the pressing direction of the pressing air bag (11).

Images