TWM505938U - Rotary safety syringe - Google Patents

Description

Rotary safety syringe

This creation is related to medical equipment, especially a rotary safety syringe.

A syringe is an instrument for injecting a liquid such as a liquid medicine, blood or a nutrient solution into a human body in cooperation with a needle. After the injection is completed, since the needle is already contaminated with blood from the human body, the used needle must be safely treated to prevent the medical staff or others from being stabbed by the needle. In the current safe handling of the needle, the most common practice is to insert the needle into a needle cover for storage, but during the insertion process, the medical staff may be pushed by their own carelessness or other external force. In this situation, the needle accidentally penetrates the hand of the medical staff and increases the risk of accidental infection of the medical staff.

In order to reduce the chance of the medical staff directly contacting the needle by hand, the safety syringe of the Chinese Patent No. 102327657 is used to pull the core rod after the injection, so that the core rod drives the linkage core to make the linkage core and the needle holder Forming a snap, and then continuously pulling the core rod can drive the needle holder back into the outer sleeve. However, it can be found from the conventional patent that there are too many components in the structure, which leads to the problem of assembly trouble and high cost. In addition, the needle seat is completed by using the bearing surface of the needle against the bearing surface of the jacket. The fixing between the outer sleeves, but the structural stability between the two bearing surfaces is not ideal, so that the needle seat can easily retract into the outer sleeve during the injection process of the needle, once the needle holder The problem of falling off, in addition to causing leakage of liquid in the outer casing, also poses a certain degree of risk to the patient. It can be seen from the above that the aforementioned conventional patent case is indeed necessary for improvement in structure.

The main purpose of the present invention is to provide a rotary safety syringe which is simple in structure, convenient in assembly, and has good structural stability.

In order to achieve the above object, the rotary safety syringe of the present invention comprises an outer cylinder, a needle holder, and an injection push rod. One end of the outer tube has a mounting portion, and the mounting portion has an inner flange; the needle holder is rotatably disposed at the mounting portion of the outer tube and has a step groove and a stop portion adjacent to the step groove, The needle holder abuts against the inner end surface of the inner flange of the outer cylinder by the step groove, and when the needle holder is in a first position, the stopper portion of the needle holder is engaged with the inner cylinder The outer end surface of the edge is fixed between the needle holder and the mounting portion of the outer tube. When the needle holder is in a second position, the stop portion of the needle holder and the inner flange of the outer tube Displaced from each other; the injection pusher is axially movably disposed in the outer cylinder and detachably coupled to the needle holder for rotating the needle holder from the first position to the second position such that the The needle holder can be pulled by the injection pusher and retracted into the outer barrel together with a needle that is fixed thereto to increase safety after the injection is completed.

In an embodiment of the present invention, one of the inner flanges protrudes toward the bottom end of the outer cylinder to have a first protrusion, so that the outer flange can abut the first protrusion on the inner flange. Block to allow the needle holder to stop rotating.

In the embodiment of the present invention, the other end of each of the inner flanges protrudes toward the bottom end of the outer tube with a second protrusion, and the second protrusion protrudes from the first protrusion by a height smaller than the first protrusion. The outer flange of the stop portion of the needle holder can be located between the first and second bumps.

In one embodiment of the present invention, one end of the injection push rod has a buckle portion, and one end of the needle holder has a snap groove, and the buckle groove is engaged with the buckle portion of the injection push rod to make the needle seat Can be fixed with the injection pusher.

In the embodiment of the present invention, the latching portion has at least one protruding portion extending from the outer edge, and the latching groove is engaged with the protruding portion of the latching portion. The protruding portion engages with the snap groove to drive the needle holder. The number of the latching portions is four, and the outer edges of the latching portions are arranged at intervals.

In an embodiment of the present invention, one end of the needle holder has an engagement groove adjacent to the buckle groove, and the engagement groove is sleeved on the joint portion of the injection push rod, and the groove wall of the engagement groove has a plurality of spaced intervals. a first longitudinal rib, one end of the injection push rod has a joint portion adjacent to the buckle portion, and the outer peripheral surface of the joint portion has a plurality of second longitudinal ribs arranged at intervals, the plurality of second longitudinal ribs being respectively engaged with The first longitudinal rib of the engagement groove of the needle hub allows the needle holder to be rotated by the injection pusher to rotate from the first position to the second position.

Referring first to Figure 1, the rotary safety syringe 10 of the present invention comprises an outer cylinder 20, a needle holder 30, and an injection pusher 40.

The outer cylinder 20 is mainly used for storing liquids such as liquid medicine, blood or nutrient solution. Referring to FIG. 2, the bottom end of the outer cylinder 20 has a mounting portion 22, and the inner wall surface of the mounting portion 22 has two opposite inner flanges 24, and the two ends of the inner flanges 24 face the bottom end of the outer cylinder 20. A first bump 241 and a second bump 242 are respectively protruded, wherein the second bump 242 protrudes less than the first bump 241.

The needle holder 30 is used for fixing a needle (not shown). Referring to FIG. 3, the needle holder 30 has a large shaft portion 31, a stopper portion 32, and a small shaft portion 33. The large shaft portion 31 has a latching groove 34 and an engaging groove 35 adjacent to the latching groove 34, wherein the groove wall of the engaging groove 35 has a plurality of first longitudinal ribs 36 arranged at intervals, and further, the large shaft portion 31 The outer peripheral cover has a stepped groove 37; the stop portion 32 is connected to the outer end surface of the large shaft portion 31 and adjacent to the stepped groove 37 of the large shaft portion 31. Further, the two ends of the stop portion 32 respectively have an outer flange 38. The small shaft portion 33 is connected to the outer peripheral surface of the stopper portion 32 and has a needle fixing groove 39, and one end of the needle fixing groove 39 communicates with the engaging groove 35 of the large shaft portion 31.

The bottom end of the injection pusher 40 has a joint portion 41 and a hook portion 42 adjacent to the joint portion 41, wherein the outer peripheral surface of the joint portion 41 has a plurality of second longitudinal ribs 43 arranged at intervals.

At the time of assembly, the needle holder 30 is first placed into the outer cylinder 20 from the top end of the outer cylinder 20 until the step groove 37 of the needle holder 30 abuts against the inner flange 24 of the mounting portion 22 of the outer cylinder 20 (eg, 4), the needle holder 30 is then rotated to a first position P1 until the outer flange 38 is passed over the second projection 242 having a lower height at one end of the inner flange 24 to abut the other end A bump 241 (as shown in FIGS. 6 and 7), the outer flange 38 of the stopper portion 32 of the needle holder 30 is located between the first and second bumps 241 and 212 and the mounting portion of the outer cylinder 20 A snap is formed between the inner flanges 24 of the 22, at which point the assembly of the needle hub 30 is completed, and then the injection pusher 40 can be inserted into the outer cylinder 20 to begin the injection (as shown in Fig. 8). After the injection is completed, as shown in FIG. 9, the buckle portion 42 of the injection pusher 40 is fastened into the buckle groove 34 of the needle holder 30 to detachably fix the injection push rod 40 and the needle holder 30. In addition, in addition, the engaging portion 41 of the injection pusher 40 is simultaneously inserted into the engaging groove 35 of the needle hub 30 and is engaged with the second longitudinal rib 43 of the engaging groove 35 of the needle hub 30 by the first longitudinal rib 36. (As shown in Fig. 10), the needle holder 30 can be rotated by the injection pusher 40 to a second position P2 (as shown in Figs. 5 and 11), when the needle holder 30 is rotated to the first position. At the two positions P2, the outer flange 38 of the stop portion 32 of the needle holder 30 can be staggered between the second projection 242 and the inner flange 24 of the mounting portion 22 of the outer cylinder 20, and The injection push rod 40 is pulled, and the injection push rod 40 pulls the needle holder 30 by the snap relationship between the buckle portion 42 and the buckle groove 34 of the needle holder 30, so that the needle holder 30 is retracted together with the needle to Inside the outer cylinder 20, as shown in Fig. 12, the purpose of needle recovery is achieved.

It should be noted that the injection pusher 40 of the present invention can have different configurations of the joint portion 41 and the buckle portion 42.

As shown in Figs. 13 and 14, the joint portion 41 has a substantially cylindrical shape, the second longitudinal rib 43 has a substantially semicircular shape, and the hook portion 42 has a substantially disk shape.

In the injection pusher 50 of another embodiment, as shown in Figs. 15 and 16, the engaging portion 51 is generally tapered toward the end, and the second longitudinal rib 53 is a substantially triangular strip, the buckle The portion 52 is substantially disk-shaped, and the joint portion 51 of this structure can effectively reduce the amount of residual liquid in the joint groove 35.

The injection pusher 60 of another embodiment is as shown in Fig. 17, the structure of the joint portion 61 and the second longitudinal rib 63 is the same as that of the embodiment of Figs. 13 and 14, and the buckle portion 62 has at least one buckle. The protrusions 621 extending from the outer edge of the portion 62 and having a substantially semicircular shape are four in the present embodiment, and are arranged at intervals on the outer edge of the buckle portion 62, and are embossed when pulled back. The portion 621 is engaged with the locking groove 34 to drive the needle holder 30. The protruding portion 621 of the structure can be repeatedly pushed and pulled because at least one point is engaged with the locking groove 34 at the first position P1. The user mixes the medicine, and on the other hand, the needle holder 30 can be effectively pulled back at the second position P2.

The injection pusher 70 of another embodiment is as shown in Fig. 18. The structure of the joint portion 71 and the second longitudinal rib 73 is the same as that of the embodiment of Figs. 15 and 16, and the structure of the snap portion 72 is the same as that of Fig. 17. The embodiment has the same shape, and has at least one protrusion 721 extending from the outer edge of the buckle portion 72 and having a substantially semicircular shape. In the embodiment, the protrusions 721 are four and are spaced apart from each other in the buckle portion 72. The outer edge. The structurally achievable effect of the engaging portion 71 and the latching portion 72 is as described above, and will not be described herein.

In summary, the rotary safety syringe 10 of the present invention compares the needle holder 30 by the engagement relationship between the inner flange 24 of the outer cylinder 20 and the outer flange 38 of the needle holder 30 during the injection process. In the conventional technology, it is more capable of withstanding a large pressure without falling off, so as to achieve the purpose of improving structural stability, and the inner flange of the outer cylinder 20 can be released by the operation of the injection push rod 40 after the injection is completed. The snap-fit relationship between the 24 and the flange 38 outside the needle holder 30 enables the needle holder 30 to be easily stored for the purpose of increasing safety of use.

10‧‧‧Rotary safety syringe
20‧‧‧Outer tube
22‧‧‧Installation Department
24‧‧‧ inner flange
241‧‧‧Bumps
30‧‧‧Needle seat
31‧‧‧ Large shaft
32‧‧‧stops
33‧‧‧Small shaft
34‧‧‧Snap slot
35‧‧‧ joint groove
36‧‧‧First longitudinal ribs
37‧‧‧ step slot
38‧‧‧Outer flange
39‧‧‧Needle fixing groove
40‧‧‧Injection putter
41‧‧‧Snap Department
42‧‧‧ joints
43‧‧‧Second longitudinal ribs
50‧‧‧Injection putter
51‧‧‧ joints
52‧‧‧Snaps
53‧‧‧Second longitudinal ribs
60‧‧‧Injection putter
61‧‧‧ joints
62‧‧‧Snap Department
621‧‧‧protrusion
63‧‧‧Second longitudinal ribs
70‧‧‧Injection putter
71‧‧‧ joints
72‧‧‧Snaps
721‧‧‧protrusion
73‧‧‧Second longitudinal ribs
P1‧‧‧ first position
P2‧‧‧ second position

Figure 1 is a planar exploded view of the creation. Figure 2 is a partial perspective view of the outer cylinder of the creation. Figure 3 is a perspective view of the needle holder of the creation. Fig. 4 is a perspective view showing the combination of the outer tube and the needle holder of the creation, mainly showing the state in which the needle holder is in the second position. Figure 5 is an end view of Figure 4. Figure 6 is similar to Figure 4 and mainly shows the state in which the needle holder is in the first position. Figure 7 is an end view of Figure 6. Figure 8 is similar to Figure 6, which mainly shows that the injection putter starts the injection. Figure 9 is similar to Figure 8, which mainly shows the state of the injection putter after the injection is completed. Figure 10 is a cross-sectional view of the creation, mainly showing the first longitudinal rib of the injection pusher being engaged with the second longitudinal rib of the engagement groove of the needle holder. Figure 11 is similar to Figure 9, which mainly shows the state in which the injection pusher pushes the needle holder to the second position. Figure 12 is similar to Figure 11, which mainly shows the state in which the injection pusher pulls the needle holder back into the outer cylinder. Fig. 13 and Fig. 14 are partial side and end views of the injection pusher of the present invention, mainly showing the structure of the joint. 15 and 16 are partial side and end views of an injection pusher according to another embodiment of the present invention, mainly showing the structure of the joint. Figure 17 is an end view of the injection pusher of another embodiment of the present invention, mainly showing the structure of the snap portion. Figure 18 is an end view of the injection pusher of another embodiment of the present invention, mainly showing the structure of the snap portion.

10‧‧‧Rotary safety syringe

20‧‧‧Outer tube

22‧‧‧Installation Department

24‧‧‧ inner flange

30‧‧‧Needle seat

31‧‧‧ Large shaft

33‧‧‧Small shaft

34‧‧‧Snap slot

35‧‧‧ joint groove

36‧‧‧First longitudinal ribs

37‧‧‧ step slot

38‧‧‧Outer flange

39‧‧‧Needle fixing groove

40‧‧‧Injection putter

41‧‧‧Snap Department

42‧‧‧ joints

43‧‧‧Second longitudinal ribs

Claims (9)

A rotary safety syringe includes: an outer cylinder having a mounting portion at one end thereof, the mounting portion having an inner flange; and a needle holder movable between a first position and a second position Rotatingly disposed on the mounting portion of the outer tube, and having a first-stage groove and a stop portion adjacent to the step groove, the step groove of the needle seat abutting against the inner end surface of the inner flange of the outer tube, The stopping portion of the needle holder is engaged with the outer end surface of the inner flange of the outer tube when the needle holder is in the first position, and the stopping portion of the needle holder is located when the needle holder is located at the second position The flanges of the cylinder are offset from each other; and an injection pusher is axially movably disposed in the outer cylinder and detachably coupled to the needle holder for rotating the needle holder from the first position To the second position. The rotary safety syringe according to claim 1, wherein one of the inner flanges protrudes toward the bottom end of the outer cylinder to have a first protrusion, and when the needle holder is in the first position, the needle The stop of the seat abuts against the first bump. The rotary safety syringe according to claim 2, wherein the other end of each of the inner flanges protrudes toward the bottom end of the outer cylinder with a second protrusion, and the height of the second protrusion is smaller than the first a bump. The rotary safety syringe according to claim 1, wherein one end of the injection push rod has a buckle portion, the needle holder has a snap groove, and the buckle groove is engaged with the buckle portion of the injection push rod. . The rotary safety syringe according to claim 4, wherein the fastening portion has at least one protruding portion extending from the outer edge, and the locking groove is engaged with the protruding portion on the locking portion. The rotary safety syringe according to claim 5, wherein the number of the buckle portions is four, and is spaced apart from each other at an outer edge of the buckle portion. The rotary safety syringe of claim 4, wherein one end of the needle holder has an engagement groove adjacent to the buckle groove, the engagement groove is sleeved at the joint portion of the injection push rod, and the groove wall of the engagement groove a plurality of first longitudinal ribs arranged at intervals, one end of the injection push rod having a joint portion adjacent to the buckle portion, the outer peripheral surface of the joint portion having a plurality of second longitudinal ribs arranged at intervals, the second portion The longitudinal ribs are respectively engaged with the first longitudinal ribs of the engaging grooves of the needle seat. The rotary safety syringe of claim 7, wherein the engaging portion is substantially tapered, and the second longitudinal rib is a substantially triangular column. The rotary safety syringe according to any one of claims 1 to 8, wherein the needle mounting portion of the outer cylinder has two opposite inner flanges, and the stopper portion of the needle holder has two opposite outer flanges. When the needle holder is in the first position, the outer flange of the stopping portion of the needle holder is engaged with the inner flange of the outer cylinder, and when the needle holder is in the second position, the needle holder is blocked. The outer flange of the portion is offset from the inner flange of the outer cylinder.