CN100400119C - Needle Retractable Safety Syringes - Google Patents

Abstract

The invention discloses a needle retractable safety syringe, which comprises a hollow needle cylinder, a push rod axially inserted into the needle cylinder, an anti-leakage ring combined with the push rod inserted into the end, and a The needle is combined with the needle at the front end of the syringe through the needle seat, wherein the outer peripheral wall of the needle seat and the needle barrel are positioned on a raised slope, and the push rod is combined with a leak-proof ring. A clamping block is protruded from the end surface, and the needle seat faces The end surface of the clamping block is concavely provided with a receiving groove communicating with the needle head, the clamping block can move axially in the receiving groove of the needle holder, and when the clamping block rotates along the direction of the inclined plane, it is combined with the needle holder , so that the outer peripheral wall of the needle holder and the needle cylinder that are positioned to form an inclined plane rotate along the direction of the push rod, and the needle holder and the needle can be retracted into the needle cylinder through the rotation of the push rod.

Description

Needle Retractable Safety Syringes

technical field

The invention relates to a device for injecting medicaments into a human body among medical devices, in particular to a safety syringe with a retractable needle.

Background technique

In order to prevent the used syringe needles from injuring medical staff or personnel who clean up waste and causing disease transmission, some practitioners have designed a safety syringe that can retract the needle to the inside of the syringe after use, and many of them have been granted patents Those who look at the safety syringe patent cases that have been approved are generally set as concave-convex cooperation between the front rod of the push rod inside the syringe and the needle seat (such as Taiwan Announcement No. 356013 "Safety Syringe" new type patent case), when the injection is completed and the push rod is pushed to the front end of the syringe, the push rod is combined with the needle seat, and when the push rod is drawn back again, the needle seat and the needle are retracted into the syringe to prevent protruding Needle pokes.

However, in fact, it often happens that the push rod is inserted behind the needle seat, but it is disengaged when it is about to be pulled back. This is because the needle seat is a slightly elastic colloid, and it uses the stretchable material properties to make the push rod However, when the push rod is about to be pulled back, it is also possible to cause the push rod to be directly separated from the needle seat by elastic stretching; The opening end of the needle base is set to be small, and the internal accommodation space is set to be large to improve the covering degree of the combination of the needle base and the push rod, but it is easy to cause the disadvantage that the push rod is not easy to push into the buckle.

Therefore, in order to overcome the shortcoming of the above-mentioned combination mode between the push rod and the needle seat, the present invention is produced.

Contents of the invention

The technical problem to be solved by the present invention is to provide a safety syringe with a retractable needle, especially a safety syringe that uses two opposite slope structures to control the retraction of the needle and avoid the separation between the push rod and the needle seat. Phenomenon needle retractable safety syringe.

For this reason, the present invention proposes a retractable needle safety syringe, comprising a hollow syringe, a push rod axially inserted into the syringe, a leak-proof ring combined with the insertion end of the push rod, and A needle that is combined with the front end of the syringe through the needle holder. A connecting part and a guide part that extend obliquely are correspondingly provided between the outer periphery of the needle holder and the inside of the syringe, and a protruding part is provided at the end of the push rod that is combined with a leak-proof ring. There is a clamping block, and the retraction method of the needle is to insert the clamping block of the push rod into the needle seat, and then combine with the needle seat after radial rotation, and the needle seat driven to rotate is formed by the gap between its outer periphery and the inside of the needle barrel. A corresponding obliquely extending structure is provided between them, so that it can exit axially along the slope of the guide part of the syringe.

A needle retractable safety syringe, comprising a hollow needle barrel, a push rod axially inserted into the needle barrel, an anti-leakage ring combined with the insertion end of the push rod, and a The needle at the front end of the barrel, where:

The outer peripheral edge of the needle seat and the interior of the needle barrel are combined and separated from each other by rotating the needle seat, and the end of the push rod combined with the leak-proof ring is provided with a clamping block, which can be axially displaced in the needle seat , but when the push rod is rotated radially, the clamping block is combined with the inside of the needle seat.

As for the safety syringe with a retractable needle as described above, a joint portion and a guide portion that fit on an appropriate inclined plane are respectively provided between the outer peripheral edge of the needle holder and the inner peripheral wall of the syringe.

As for the retractable needle safety syringe as described above, the joint part provided on the outer periphery of the needle seat is two opposite protrusions, and the two protrusions respectively have a section of oblique side edge, and the guide part of the syringe The corresponding recess is then configured as a groove with an oblique side edge.

As for the needle retractable safety syringe described above, the clamping block formed on the push rod is an elastic clamping block with compressible elasticity in the middle section, and several compressible elastic pieces are provided on the periphery of the elastic clamping block The inner wall of the accommodating groove of the needle holder is equally provided with the same number of projections as the elastic sheet, and the elastic sheet can be combined between the two projections.

In the retractable needle safety syringe described above, the elastic clamping block is composed of several plastic elastic sheets whose middle sections protrude outward, and the free ends of each plastic elastic sheet are integrated together.

The characteristics and advantages of the present invention are: a retractable needle safety syringe proposed by the present invention, the outer peripheral edge of the needle seat is formed on the needle cylinder by the inner end of the syringe in the form of a raised slope, and the needle seat faces one end of the push rod An accommodating groove which is recessed and communicated with the needle head is provided, and an end surface of the push rod combined with the leak-proof ring is protrudingly provided with a clamping block which can be inserted into the accommodating groove of the needle head and drives the needle seat by lateral rotation.

With the above-mentioned structure, since the needle base and the syringe are fitted and combined with each other with appropriate convex slopes, if only an axial pull is applied to the push rod, the two cannot be separated, and when the injection is completed, the needle will be retracted. When turning back, turn the push rod along the direction of the raised slope, so that the clamping block on the push rod is linked with the needle seat, and then the needle seat is separated from the needle cylinder along the direction of rotation of the push rod and retracted into the needle cylinder. The invention can prevent the phenomenon that the push rod and the needle seat of the product of the prior art will be detached.

Description of drawings

Fig. 1 is the three-dimensional appearance schematic diagram of the present invention;

Fig. 2 is a schematic diagram of a partial three-dimensional appearance of the present invention;

Fig. 3 is an exploded schematic diagram of a partial three-dimensional appearance of the present invention;

Fig. 4 is a schematic cross-sectional view of the planar movement of the elastic clamping block of the present invention inserted into the accommodating groove of the needle holder;

Fig. 5 is a schematic diagram of a partial three-dimensional appearance of the elastic clamping block of the present invention inserted into the accommodating groove of the needle holder;

Fig. 6 is a schematic cross-sectional view of the cooperation between the elastic clamping block and the protrusion of the needle holder of the present invention;

FIG. 7 is a partial perspective view of retracting the needle holder and the needle according to the present invention.

Explanation of reference numbers:

10. Syringe 11. Finger hook piece 12. Combination end 13. Combination hole

14. Guide part 20. Push rod 22. Elastic clamping block 221. Elastic sheet

30. Leak stop ring 40. Needle seat 41. Needle 42. Joint

43. Accommodating groove 44. Protruding block

Detailed ways

Please refer to FIGS. 1 to 3, the present invention includes a hollow syringe 10, a push rod 20 axially inserted into the syringe 10, an anti-leakage ring 30 combined with the end of the push rod 20 inserted into the end, and A needle 41 combined with the front end of the syringe 10 via the needle holder 40 . Wherein, the end face of the push rod 20 combined with the anti-leakage ring 30 protrudes from a clamping block. The inside moves axially, and when the push rod is rotated laterally, it can be interlocked with each other, and the outer peripheral wall of the needle holder 40 and the syringe 10 utilize two concave-convex fits that are suitable slopes. When using the present invention, the push rod 20 is first pushed to the front end of the syringe 10 so that the elastic clamping block 22 of the push rod 20 is directly inserted into the inside of the needle holder 40, since the elastic clamping block 22 has the elasticity that can be compressed, it is also It can be drawn back directly, and the liquid medicine can be sucked by the needle 41. When injecting, push the push rod 20 forward again, so that the elastic clamping block 22 is inserted inside the needle holder 40, and then fit the direction according to the slope of the needle holder 40 Reversely rotating the push rod 20 can cause the elastic clamping block 22 to engage with the inside of the needle holder 40 , and then retract the needle holder 40 and the needle 41 axially along the inclined plane into the syringe 10 .

The above-mentioned design concept of the present invention is that the elastic clamping block 22 and the needle holder 40 can be linked when they are rotated, and the needle holder 40 and the needle cylinder 10 are fitted by rotating along the inclined plane. When the needle holder 40 and the needle head 41 are retracted, after the push rod 20 is fully pushed out, the push rod 20 can be rotated laterally along the direction of the inclined plane to drive the needle holder 40 to be screwed into the syringe, and the specific structure for implementing the above concept is described as follows: back:

Please refer to Fig. 3 again, one of the ends of the syringe 10 is provided with a protruding finger hook 11 for the medical staff to hold with their fingers to facilitate force application, and the other end is provided with a tapered joint end 12 for jointing. The center of the end 12 is provided with a combination hole 13, and the inner peripheral wall of the combination hole 13 is provided with a guide part 14 extending obliquely along the peripheral wall. In this embodiment, the guide part 14 is set from the combination hole 13 adjacent to the syringe There are two sections of oblique guiding grooves extending from the end of 10 to the end of the needle 41, and the outer peripheral wall of the needle holder 40 and the inner peripheral wall of the corresponding joint hole 13 are provided with two joints 42 with appropriate inclinations, so that the needle holder 40 It fits with the needle cylinder 10 in a mutual rotation manner, as shown in FIG. A single oblique line or three sections of oblique lines are set in between, or the guide part 14 of the syringe 10 is provided as an oblique line, and the joint part 42 of the needle holder 40 is provided as a protrusion that can move along the oblique groove , in short, where the needle holder 40 and the syringe 10 are combined in an oblique manner, and the two cannot be separated only by applying an axial pulling force, it is within the technical scope of the present invention.

As can be seen from FIG. 3 , the outer periphery of the needle holder 40 is provided with a joint portion 42 that cooperates with the guide portion 14 of the needle cylinder 10, and an accommodating groove 43 that is recessed and communicated with the needle head 41 is provided inside the accommodating groove. The inner peripheral wall of 43 is equally provided with several projections 44 protruding toward the center, which are used to cooperate with the elastic clamping block 22 of the push rod 20 to be clamped.

The push rod 20 is tightly pressed between the inner peripheral wall of the syringe 10 and the push rod 20 by the leak-proof ring 30 to achieve the leak-proof effect, and the elastic clamping block 22 protrudes from the push rod 20 and is arranged on the In the center of the end face of the anti-leakage ring 30, the outer diameter of the middle section of the elastic clamping block 22 is relatively large and has a compressible elasticity. Made of plastic elastic pieces 221, each plastic elastic piece 221 extends from the end face of the push rod 20, and after the middle section is expanded outward, the ends are combined into one body, so that the middle section has compressible elasticity, and the maximum outer peripheral edge of the elastic clamping block 22 Smaller than the inner diameter of the accommodation groove 43 of the needle holder 40, so when the elastic clamping block 22 of the push rod 20 is inserted into the joint portion 42 of the needle holder 40 as shown in Figures 4 and 5, the middle section of the elastic clamping block 22 will will be compressed, if the push rod 20 is drawn back linearly, since the needle seat 40 and the syringe 10 are combined on an inclined plane, if only an axial pulling force is applied, the two cannot be separated, so the push rod 20 can be withdrawn independently but The needle hub 40 is not retracted.

The above is the detailed structure of the present invention, and the action during its operation is described as follows:

When the medical personnel use the syringe, they can push the push rod 20 toward the needle 41 to discharge the air inside the syringe 10. If they push the push rod 20 as shown in Figures 4 and 5 as usual, The elastic clamping block 22 will be inserted into the accommodation groove 43 of the needle holder 40 in a compressed state, and then the push rod 20 will be withdrawn to suck the medicinal solution from the needle 41. Force, so the needle seat 40 and the needle 41 will not be buckled and retracted with the elastic clamping block 22, and the situation of wrong buckling will not occur. When the medical staff injects and pushes the push rod 20 forward again, after the injection is completed, the push rod 20 is reversely rotated in the direction in which the needle seat 40 is combined (for example, the joint 42 of the needle seat 40 is an oblique line to the right. At this time, the left-handed direction is applied at this time), and the elastic pieces 221 of the elastic clamping block 22 will be clamped between the protrusions 44 of the needle holder 40 as shown in Figure 6. When the push rod 20 continues to rotate, it can The side of each elastic piece 221 pushes against the protruding block 44 so that the needle holder 40 and the needle 41 reversely rotate along the guide part 14 of the syringe 10 , and retract into the interior of the syringe 10 as shown in FIG. 7 .

To sum up, the present invention utilizes the advantage of the slope formed between the two opposing push rods 20 and the needle holder 40 to make the needle 41 retract smoothly, which can improve the shortcomings of the existing safety syringes and has great industrial applicability.

Claims (6)

1. retractable needle formula safety injector, the syringe that comprises a hollow, one axially to be inserted in the push rod in the syringe, one is incorporated into the seal ring of push rod insertion end, and one be incorporated into the syringe needle of syringe front end by needle holder, the corresponding joint portion that is provided with oblique extension between needle holder outer peripheral edges and the syringe inside, guidance part, other is provided with a clamping block in the distal process that push rod is combined with seal ring, the retraction mode of syringe needle is that the clamping block with push rod is inserted in the needle holder, combine with needle holder after radially rotating, the needle holder that is driven rotation axially withdraws from its guidance part inclined-plane along syringe by set corresponding oblique extended structure between its outer peripheral edges and the syringe inside.

2. retractable needle formula safety injector comprises that the syringe, of a hollow is incorporated into the seal ring and that push rod inserts this end and is incorporated into the syringe needle of syringe front end by needle holder axially to be inserted in push rod, in the syringe, it is characterized in that:

Mutually combine in the mode of rotating needle holder between needle holder outer peripheral edges and the syringe inside and break away from, and being combined with a distal process of seal ring, push rod is provided with a clamping block, this clamping block can axial displacement in needle holder, but radially during rotating push-rod, clamping block promptly combines with needle holder is inner.

3. retractable needle formula safety injector as claimed in claim 2 is characterized in that: be respectively equipped with the joint portion, the guidance part that are suitable inclined-plane and agree with between described needle holder outer peripheral edges and the syringe internal perisporium.

4. retractable needle formula safety injector as claimed in claim 3, it is characterized in that: the described joint portion of being located at the needle holder outer peripheral edges is two projections that are oppositely arranged, two projections and have one section oblique lateral margin respectively, the guidance part of syringe then corresponding female is made as the groove with one section oblique lateral margin.

5. as claim 2,3 or 4 described retractable needle formula safety injectors, it is characterized in that: the clamping block that forms on the described push rod is that the stage casing has and can be compressed elastic elasticity clamping block, elasticity clamping block periphery is provided with several can compressed flexure strip, be arranged with projection with the flexure strip equal number in storage tank internal perisporium of needle holder etc., flexure strip can be incorporated between two projections.

6. retractable needle formula safety injector as claimed in claim 5 is characterized in that: described elasticity clamping block is made of the outwards outstanding elasticity of plastics sheet in several pieces stage casings, the free end of each elasticity of plastics sheet and being combined as a whole.

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