WO2016058278A1

WO2016058278A1 - Rotary safety syringe

Info

Publication number: WO2016058278A1
Application number: PCT/CN2015/000107
Authority: WO
Inventors: 洪志华
Original assignee: 洪志华
Priority date: 2014-10-14
Filing date: 2015-02-16
Publication date: 2016-04-21

Abstract

Disclosed is a rotary safety syringe (10), comprising an outer cylinder (20), a needle hub (30), and an injection push rod (40). One end of the outer cylinder (10) has an inner flange (24). The needle hub (30) has a stage groove (37) and a stopper portion (32) adjoining the stage groove (37), and the needle hub (30) abuts the inner flange (24) of the outer cylinder (20) through the stage groove (37) when assembled on the outer cylinder (20). When the needle hub (30) is in a first position (P1), the stopper portion (32) of the needle hub (30) clamps the inner flange (24) of the outer cylinder (20), and when the needle hub (30) is in a second position (P2), the stopper portion (32) of the needle hub (30) is staggered from the inner flange (24) of the outer cylinder (20). The injection push rod (40) can be movably disposed within the outer cylinder (20) and is detachably connected to the needle hub (30) for rotating the needle hub (30) from the first position (P1) to the second position (P2), so that the needle hub (30) can be pulled back into the outer cylinder (20) by the injection push rod (40) in order to increase the safety after injecting.

Description

Rotary safety syringe

Technical field

The invention relates to medical devices, and in particular to a rotary safety syringe.

current technology

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 has been attached to the blood of the human body, the needle after use 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 medical personnel directly contacting the needle by hand, the safety syringe of the Chinese Patent No. 102327657 is formed by pulling back the core rod after the injection is completed, so that the core rod drives the linkage core to form a joint between the linkage core and the needle holder. Engage, and then continue to pull the core rod to drive the needle holder back into the jacket. 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 holder is completed by the bearing surface of the sleeve against the bearing surface of the jacket. The fixing between the jacket and the jacket, but the structural stability between the two thrust surfaces is not ideal, so that the needle seat is easily retracted into the jacket because it cannot withstand the pressure during the injection of the needle, once the needle The problem of falling off the seat, in addition to causing leakage of liquid inside the jacket, also poses a certain degree of risk to the patient. From this, it can be seen that the above-mentioned conventional patent case is indeed necessary for improvement in structure.

Summary of the invention

The main object 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 present invention adopts the following technical solution: a rotary safety syringe, characterized by comprising: an outer cylinder, one end of the outer cylinder has a mounting portion, and the mounting portion has an inner flange a needle holder rotatably disposed at a mounting portion of the outer cylinder between a first position and a second position, and having a first-stage groove and a stop portion adjacent to the step groove a step groove of the needle hub abuts against an inner end surface of the inner flange of the outer cylinder, wherein the needle seat is located at the needle seat a first position is engaged with an outer end surface of the inner flange of the outer cylinder, and a stop portion of the needle seat is between the inner position of the outer cylinder and the inner flange of the outer cylinder when the needle holder is in the second position Displaced from each other; an injection pusher is axially movably disposed in the outer cylinder and detachably coupled to the needle holder, and the needle holder is rotated from the first position to the second position .

In the above technical solution of the present invention, one end of each 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 holder The stop portion abuts against the first bump. Allowing the needle hub to stop rotating.

The other end of each of the inner flanges protrudes toward the bottom end of the outer cylinder to have a second protrusion, and the second protrusion protrudes from the first protrusion. The outer flange of the stop portion of the needle hub can be positioned between the first and second bumps.

One end of the injection push rod has a buckle portion, and the needle holder has a snap groove, and the buckle groove is engaged with the buckle portion of the injection push rod. The needle holder can be secured to the injection pusher.

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. When the pullback is performed, the needle holder is driven by the protruding portion engaging with the buckle groove.

The number of the latching portions is four, and is spaced apart from each other at an outer edge of the latching portion.

One end of the needle holder has an engagement groove adjacent to the buckle groove, 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 first intervals arranged at intervals a 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 The first longitudinal ribs of the engaging grooves of the needle holder are respectively engaged. The needle holder is rotatable by the injection pusher to rotate from the first position to the second position.

The joint portion is generally tapered, and the second longitudinal rib is a substantially triangular column.

The needle mounting portion of the outer barrel has two opposite inner flanges, the stop portion of the needle holder having two opposite outer flanges, the needle holder when the needle holder is in the first position An outer flange of the stopping portion is engaged with an inner flange of the outer cylinder, and an outer flange of the stopping portion of the needle seat and the outer cylinder when the needle holder is in the second position The inner flanges are offset from each other.

According to the above technical solution, the present invention has an advantage in that when the needle holder is in a first position, the stopper portion of the needle holder is engaged with the outer end surface of the inner flange of the outer cylinder, so that the needle is The seat and the mounting portion of the outer cylinder can be fixed together, so that the needle seat can withstand greater pressure than the conventional technology without falling off to achieve structural stability; when the needle is Seat a second position, the stop portion of the needle holder and the inner flange of the outer tube are offset from each other; the injection push rod is axially movably disposed in the outer tube and detachably Connecting to the needle holder for rotating the needle holder from the first position to the second position such that the needle holder can be pulled by the injection pusher together with a needle fixed thereto Retracting into the outer tube together increases the safety after the injection is completed. Moreover, the structure of the present invention is simpler than the conventional structure and can be easily assembled.

The invention is applicable to various medical and health institutions such as hospitals and health centers.

DRAWINGS

Figure 1 is a plan exploded view of the present invention

Figure 2 is a partial perspective view of the outer cylinder of the present invention

Figure 3 is a perspective view of the needle holder of the present invention

4 is a perspective view showing the combination of the outer tube and the needle holder of the present invention, 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, mainly showing the state in which the needle holder is in the first position.

Figure 7 is an end view of Figure 6

Figure 8 is the same as Figure 6, which mainly shows that the injection putter starts to inject.

Figure 9 is the same as 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 present invention, 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 and mainly shows the state in which the injection pusher drives the needle holder to the second position.

Figure 12 is similar to Figure 11 and mainly shows the state in which the injection pusher pulls the needle holder back into the outer cylinder.

Figure 13 and Figure 14 are partial side and end views of the injection pusher of the present invention, mainly showing the structure of the joint

15 and FIG. 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 portion.

Figure 17 is an end view of an injection pusher according to another embodiment of the present invention, mainly showing the structure of the adapter joint

Figure 18 is an end view of an injection pusher according to another embodiment of the present invention, mainly showing the structure of the adapter joint

Best mode for carrying out the invention

First, as shown in FIG. 1, the rotary safety syringe 10 of the present invention comprises an outer cylinder 20 and 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 are respectively convex toward the bottom end of the outer cylinder 20. A first bump 241 and a second bump 242 are formed, 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 snap groove 34 and an engagement groove 35 adjacent to the snap groove 34, wherein the groove wall of the engagement groove 35 has a plurality of first longitudinal ribs 36 arranged at intervals, and further, the large shaft portion 31 The outer peripheral mask has a stepped groove 37; the stopper portion 32 is connected to the outer end surface of the large shaft portion 31 and is adjacent to the stepped groove 37 of the large shaft portion 31. Further, the two ends of the stopper 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 hub 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 hub 30 abuts against the inner flange 24 of the mounting portion 22 of the outer cylinder 20 (as shown in the figure). 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 first end of the other end Up to the bump 241 (as shown in FIGS. 6 and 7 ), the outer flange 38 of the stopper portion 32 of the needle holder 30 is positioned between the first and second bumps 241 and 212 and the mounting portion 22 of the outer cylinder 20 The inner flanges 24 are engaged with each other, and the assembly of the needle holder 30 is completed. Then, the injection pusher 40 can be inserted into the outer cylinder 20 to start the injection (as shown in Fig. 8). After the injection is completed, as shown in FIG. 9, the locking portion 42 of the injection pusher 40 is fastened into the locking groove 34 of the needle holder 30, so that the injection push rod 40 and the needle holder 30 are detachably fixed to each other. 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 (eg 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 second position P2. The outer flange 38 of the stopper portion 32 of the needle holder 30 can be displaced from the second protrusion 242 and the inner flange 24 of the mounting portion 22 of the outer tube 20, and the force is applied by pulling the injection. The rod 40 and the injection pusher 40 pull the needle holder 30 by the snap relationship between the latching portion 42 and the latching groove 34 of the needle hub 30, so that the needle hub 30 is retracted together with the needle into the outer cylinder 20, As shown in Figure 12, to achieve the purpose of needle recycling.

It should be noted that the injection pusher 40 of the present invention can have other different structural changes in 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 semi-circular shape, and the buckle portion 42 has a substantially disk shape.

In the injection pusher 50 of another embodiment, as shown in FIG. 15 and FIG. 16, the engaging portion 51 is generally tapered toward the end, and the second longitudinal rib 53 is a substantially triangular strip, and the engaging portion 52 is provided. The disk portion is substantially disk-shaped, and the joint portion 51 of such a 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 portion. The protrusions 621 of the outer edge of the outer edge of the outer periphery of the latching portion 62 are arranged at intervals with respect to the outer edge of the latching portion 62, and are passed through the protruding portion 621 when pulled back. When the latching portion 34 is engaged with the latching groove 34 to drive the needle holder 30, the protruding portion 621 of such a structure can be repeatedly pushed and pulled to facilitate the user because at least one point is engaged with the latching groove 34 at the first position P1. The mixed drug can also effectively pull back the needle holder 30 at the second position P2.

The injection pusher 70 of another embodiment is as shown in FIG. 18. The structure of the engaging 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 engaging portion 72 is the same as that of the embodiment of FIG. Similarly, there are at least one projections 721 extending from the outer edge of the latching portion 72 and having a substantially semicircular shape, which are four in this embodiment, and are spaced apart from each other at the outer edge of the latching portion 72. . The structurally local 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 passes 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, so that the needle holder 30 is compared with the needle holder 30. The conventional technology can withstand greater pressure without falling off to achieve the purpose of improving structural stability, and the inner flange 24 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 outer flanges 38 of the needle hub 30 allows the needle hub 30 to be easily stored for the purpose of increasing safety of use.

Industrial applicability

The rotary safety syringe provided by the invention is suitable for use by a large number of medical and health institutions, and has a very broad industrial application prospect.

Claims

A rotary safety syringe characterized by comprising:

An outer cylinder having a mounting portion at one end thereof, the mounting portion having an inner flange;

a needle holder rotatably disposed at a mounting portion of the outer cylinder between a first position and a second position, and having a first-stage groove and a stop portion adjacent to the step groove, a stepped groove of the needle seat abuts against an inner end surface of the inner flange of the outer cylinder, and the stopping portion of the needle seat is engaged with the inner convex of the outer cylinder when the needle seat is in the first position An outer end surface of the rim, the stop portion of the needle holder is offset from the inner flange of the outer cylinder when the needle holder is in the second position;

An injection pusher is axially movably disposed within the outer barrel and detachably coupled to the needle holder to rotate the needle holder from the first position to the second position.
A rotary safety syringe according to claim 1, wherein one end of each of said inner flanges protrudes toward a bottom end of said outer cylinder with a first projection, and said needle holder is located at said bottom In the first position, the stop of the needle seat abuts against the first bump.
A 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 projection, and the second projection is convex. The height is smaller than the first 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 The snap portion of the injection pusher.
The rotary safety syringe according to claim 4, wherein the latching portion has at least one projection extending from the outer edge, and the snap groove is engaged with the latching portion. The protrusion.
The rotary safety syringe according to claim 5, wherein the number of the latching portions is four and is spaced apart from each other at an outer edge of the latching portion.
The rotary safety syringe according to claim 4, wherein one end of the needle holder has an engagement groove adjacent to the snap groove, and the engagement groove is sleeved at a joint portion of the injection push rod. The groove wall of the engaging groove has a plurality of first longitudinal ribs arranged at intervals, and 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 ribs of the engagement grooves of the needle holder.
A rotary safety syringe according to claim 7, wherein said engaging portion is substantially tapered, and said 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 sides An outer flange, the outer flange of the stop portion of the needle holder is engaged with the inner flange of the outer cylinder when the needle holder is in the first position, when the needle holder is located In the second position, the outer flange of the stop portion of the needle hub and the inner flange of the outer cylinder are offset from each other.