TWI564048B - Push the unloading needle safety syringe - Google Patents

Description

Push needle safety syringe

The present invention is related to a safety needle for medical injection, and more specifically, a safety needle that can be used to detach the needle from the front end of the barrel after use.

It is necessary to provide a protective device on the syringe barrel based on the risk of protecting the medical staff from needle sticking of the used syringe. A typical protective device, as disclosed in U.S. Patent No. 8,860,694, is to pull the needle back into the syringe, referred to as a pullback safety needle.

In the above-mentioned pull-back safety injection needle, the stability of the combination and the retractability after use are particularly considered in combination with the needle holder of the injection needle, and the gas density after the combination of the needle holder and the syringe needs to be very high. The standard is that no air can penetrate into the syringe to prevent the air from being injected into the human body, posing a risk of embolism. However, in terms of structure, if only the stability and airtightness of the combination are considered, it is easy to cause a problem that the needle seat is not easily pulled back. If the needle holder is easily pulled back, the combination stability and airtightness of the needle holder and the syringe may be weakened. In order to solve the problem of ease of pullback, stability and airtightness, the syringe, the needle holder and the push rod must all be redesigned, and the structure will tend to be complicated, so that the manufacturing cost and difficulty are increased, and even difficult to achieve.

The conventional pull-back safety injection needle mainly uses a protruding hook body in the front end of the push rod to engage with the needle seat, and pulls the needle seat back into the syringe. However, in actual use, when the push rod is pushed to be near the front end of the syringe, that is, the end edge of the hook body is in contact with the bottom end of the needle seat, the front end of the hook body will first close the inside of the needle seat. The liquid medicine injection channel forms a closed space between the front end of the syringe and the hook body, and the residual liquid in the space cannot advance through the injection channel to form a residual medicine in the syringe. However, some special liquids are not only expensive, but also necessary to inject a sufficient dose, and the residual drug may cause an insufficient injection dose, which is not allowed to occur. To solve the problem of the above-mentioned residual medicine, it is to apply a larger thrust of the push rod, break through the resistance of the closed space, and force the hook body of the push rod to engage with the needle seat. However, the large thrust and the breakthrough of the resistance of the closed space will cause the syringe and the needle to vibrate, which will aggravate the pain at the injection site of the patient, and even the needle will puncture the blood vessel.

Another problem with actual use is that it takes the medicine from the above-mentioned pull-back safety injection needle. When picking up the liquid in the bottle. Before taking the liquid medicine, the medical staff must perform the action of pushing the push rod to the front end of the syringe to completely discharge the air in the syringe. After that, the needle is poked into the medicine bottle, and the push rod is pulled back to draw the liquid medicine to the syringe. Inside. However, the action of pushing the push rod to the foremost end of the syringe is likely to cause an erroneous combination of the hook body and the needle seat, so that the needle pullback malfunction occurs when the pusher pulls the medicine liquid.

Moreover, the above-mentioned pull-back safety injection needle has to be operated by two hands with one hand. Hold the syringe and push the puller back. However, in actual use, the medical staff usually takes the syringe away from the patient with one hand, and the other hand then presses the injection site of the patient to stop bleeding with the alcohol cotton. At this time, the medical staff can't perform the pullback action with both hands, thus generating the needle. An empty window that is exposed.

The purpose of the present invention is to provide a push-type safety syringe that can be used after use. Discharge the needle from the front end of the syringe.

The push needle safety syringe of the present invention achieves the above object, comprising: a syringe, The syringe has a push rod reciprocally movable along an inner wall of the barrel; the front inner wall of the barrel is assembled with a joint by an engaging structure, the joint is sleeved with a needle. The joint structure engages with a tapered outer wall of the joint seat with a tapered inner wall protruding from the inner wall of the syringe The limiting collar and the limiting ring groove of the joint frame form a limiting function, and the engaging structure is fitted into the fitting ring of the joint seat by a fitting groove, thereby positioning the joint seat on the joint structure in. The rearward displacement of the push rod in the syringe can insert the liquid medicine in a vial into the syringe through the needle and the joint; the forward displacement of the push rod in the syringe can take the liquid medicine Output through the joint and the needle. When the push rod is displaced forward to the fitting ring contacting the joint seat, a larger thrust is applied to move the joint seat together with the needle thereon to move away from the joint structure and the syringe, thereby achieving use. The rear needle is separated from the syringe to protect the medical staff from being punctured after use.

A push-type safety syringe is provided, and the needle is unloaded from the front end of the syringe by pushing the push rod. The way to unload the needle is completely different from the traditional pullback syringe.

The invention advances the needle-removing safety syringe to perform the needle unloading action with one hand.

The invention unloads the needle from the front end of the syringe, and separates the used needle from the syringe to achieve the purpose of separate recovery.

The joint seat and joint structure of the present invention have assembly stability, airtightness, and needle release convenience.

The syringe of the invention allows the push rod in the syringe to freely reciprocate in the syringe, and can freely perform the operation of evacuating the empty syringe and pumping the liquid from the vial without affecting the joint and the needle, completely The problem of the pullback syringe pulling back the needle is avoided.

When the push drug is injected, the joint seat of the present invention cooperates with the push rod to reduce the pushing resistance.

At the end of the injection of the drug, no liquid remains between the joint and the pusher of the present invention.

The joint is engaged inside the front end of the barrel without any outward protrusion, so that the medical staff is not hindered from using the syringe.

Compared with the conventional pull-back type injector, the structural design of the joint seat and the syringe of the present invention is relatively simple, and the push rod and the needle structure of the syringe need not be changed, and the applicability of the existing push rod and the needle is retained, and the development and modification are reduced. ,manufacturing cost.

10‧‧‧Syringe

101‧‧‧ front end

102‧‧‧ inner wall

103‧‧‧ Backend

11‧‧‧ joint structure

12‧‧‧Conical inner wall

121‧‧‧ Backend

D1‧‧‧ cone inner diameter

122‧‧‧ front end

D2‧‧‧ syringe inner diameter

13‧‧‧Limited convex ring

131‧‧‧ Front torus

132‧‧‧Intermediate torus

133‧‧‧ After torus

134‧‧‧Chamfering

14‧‧‧ fitting slot

20‧‧‧Put

21‧‧‧ push block

22‧‧‧Small cone

30‧‧‧ joint seat

31‧‧‧ needle joint

311‧‧‧ front end

32‧‧‧Conical outer wall

33‧‧‧Ring socket

34‧‧‧ Limit ring groove

36‧‧‧Chimeric ring

361‧‧‧Exhaust ring groove

362‧‧‧ rear end face

37‧‧‧Axis hole

38‧‧‧ Sockets

40‧‧‧ needle

41‧‧‧ needle seat

42‧‧‧ needle

The first figure is an exploded perspective view of the present invention.

The second figure is a cross-sectional exploded view of the front end of the syringe, the joint, and the needle of the present invention.

The third figure is a combined sectional view of the front end of the syringe, the joint, and the needle of the present invention.

The fourth figure is a combined sectional view of the safety syringe of the present invention.

Figure 5 is a cross-sectional view showing the combination of the safety syringe of the present invention.

Figure 6 is a schematic cross-sectional view of the safety syringe of the present invention.

The central idea expressed in the column of the above summary of the invention is expressed by way of specific examples. Various items in the embodiments are depicted in terms of ratios, dimensions, amounts of deformation, or displacements that are suitable for illustration, and are not drawn to the proportions of actual elements, as set forth above.

As shown in the first figure, the push-type safety syringe of the present invention comprises: a syringe 10, a push rod 20 that is inserted into the syringe 10 and reciprocally movable, and a joint that is combined with the front end of the syringe 10. 30. A needle 40 combined with the front end of the joint 30.

As shown in the first, second and third figures, the inner wall of the front end 101 of the barrel 10 is provided with an engaging structure 11 for assembling the joint 30. The joint structure 11 includes a tapered inner wall 12 formed on the front end 101 of the barrel 10, a limiting collar 13 projecting from the inner wall of the barrel 10 and continuing from the rear end of the tapered inner wall 12, and a fitting groove formed on the inner wall of the barrel 10 and continuing after the limiting collar 13 14. The inner diameter D1 of the barrel defined by the rear end 121 of the tapered inner wall 12 is smaller than the inner diameter D2 of the barrel defined by the front end 122 of the tapered inner wall 12. The limiting collar 13 includes a front annular surface 131, an intermediate annular surface 132, and a rear annular surface 133. The intermediate annulus 132 is coupled between the front annulus 131 and the rear annulus 133. The front annular surface 131 is formed by a backward tapered diameter from the rear end 121 of the tapered inner wall 12; the intermediate annular surface 132 is continuous with the smallest diameter portion of the front annular surface 131, the intermediate annular surface 132 and the syringe The inner wall 102 of the 10 is parallel; the rear annulus 133 is an annulus perpendicular to the inner wall 102 of the barrel 10. The rear annulus 133 and the intermediate annulus 132 have a chamfer 134 at the junction. The fitting groove 14 is recessed in the inner wall 102 of the barrel 10.

The joint 30 includes a hub joint 31 and a connection to the hub joint 31 A fitting ring 36 at the end; a shaft hole 37 extends through the hub joint portion 31 and the center of the fitting ring 36. The hub joint portion 31 has a tapered outer wall 32 whose angle and axial length coincide with the tapered inner wall 12 of the barrel 10. The hub joint portion 31 has an annular sleeve groove 33 that surrounds the shaft hole 37 and that opens into the front end 311 of the hub joint portion 31. The annular sleeve groove 33 is disposed such that the circumference of the shaft hole 37 forms a set of posts 38. The hub joint portion 31 further has a limit ring groove 34 which is continuous at the small diameter end of the tapered outer wall 32 and recessed downward into the outer wall of the hub joint portion 31. The fitting ring 36 is made of an elastic material, and the outer diameter of the fitting ring 36 is equal to the inner diameter of the fitting groove 14 of the cylinder 10; the outer wall of the fitting ring 36 is provided with an exhaust ring groove 361. The rear end face 362 of the fitting ring 36 is a flat surface.

The joint seat 30 is incorporated into the joint structure 11 from the front end 101 of the barrel 10. The tapered outer wall 32 is engaged with the tapered inner wall 12, and the front end 311 of the hub joint portion 31 is aligned with the front end 101 of the cylinder 10. The limiting collar 13 of the joint structure 11 is located in the limiting ring groove 34 of the joint seat 30. The fitting ring 36 of the joint 30 is fitted into the fitting groove 14 of the joint structure 11.

The front ring of the limiting convex ring 13 is inserted into the joint structure 11 The face 131 provides a guiding function for the resilient fitting ring 36 to be slightly squeezed through the front annulus 131 and the intermediate annulus 132 into the fitting groove 14, the outer wall of the fitting ring 36 being in close contact The inner wall of the fitting groove 14 achieves an airtight effect; and the rear annular surface 133 of the limiting collar 13 provides a function of blocking the circumferential end of the fitting ring 36, so that the joint 30 cannot be The syringe 10 is easily detached in the opposite direction of the joining direction. Next, the limiting collar 13 is snapped into the limiting ring groove 34 of the joint 30 to further limit the joint 30. The tapered inner wall 12 of the joint structure 11 is engaged with the tapered outer wall 32 of the joint seat 30, so that the joint seat 30 is pushed inwardly to the joint structure 11 and the joint seat 30 and the joint structure are maintained. 11 air tightness.

The needle 40 includes a hollow needle hub 41 and a needle body connected to the front end of the needle holder 41. 42. The front end of the push rod 20 has a push block 21 made of an elastic material, and the push block 21 has a small tapered body 22 at the center of the front end. In the present invention, both the push rod 20 and the needle 40 are of an existing construction, which means that the present invention retains the applicability of the existing push rod 20 and the needle 40, and the cost of redevelopment can be reduced.

Prior to using the safety syringe of the present invention, the needle 40 is passed through the needle seat 41 through the ring The sleeve groove 33 is sleeved outside the socket post 38. The unopened needle is sleeved on the needle hub 41 by a plastic cover (not shown) and shields the needle body 42. Therefore, the medical staff does not come into contact with the needle body 42 when the unused needle 40 is taken. Sometimes, when the medical staff sleeves the needle 40, a rotation force is applied to the needle holder 41, so that the needle holder 41 is subjected to a torsion force to be more deeply combined with the socket post 38. At this time, the above fit The tapered inner wall 12 and the tapered outer wall 32 function as a stopper to hold the joint seat 30 against the thrust and the rotational force from the hub 41 without being displaced into the interior of the barrel 10.

As shown in the fourth and fifth figures, the push rod 20 can freely reciprocate in the syringe 10, It can be pushed forward from the rear end 103 of the barrel 10 until the push block 21 at the front end of the push rod 20 contacts the rear end surface 362 of the fitting ring 36 of the joint 30. When the syringe 10 is empty, the action of pushing the push rod 20 forward can remove the air in the syringe 10 through the needle 42. It is necessary to exclude the air in the syringe 10 (empty syringe exhaust) before the liquid medicine is drawn from the inside of the bottle cap into the inside of the barrel 10. Next, the needle 42 is poked into the vial, and the pusher 20 is pulled back, and the liquid medicine in the vial enters the syringe 10 through the needle 42. It should be noted that the reciprocating movement of the push rod 20 does not affect the joint 30 and the needle 40 regardless of whether the empty syringe is exhausted or the push rod is pulled back. Next, the medical staff injects the patient with a syringe and pushes the push rod 20 forward to allow the liquid to enter the patient through the needle 42. It should be noted that the needle body 42 pokes the resistance of the patient's skin and muscles, and the engagement of the conical inner wall 12 and the tapered outer wall 32 keeps the joint 30 and the needle 42 stable without any shaking. . Further, the engaging seat 30 is engaged inside the front end of the barrel 10 without any outwardly protruding structure, and thus does not hinder the medical staff from using the syringe.

As shown in the fifth figure, the pusher 20 is pushed forward, and the medical liquid enters the patient through the needle 42. The rear end surface 362 of the fitting ring 36 of the joint 30 is a flat surface, and the center is a shaft hole 37. Such a configuration can be matched with the push block 21 of the push rod 20, and the push block 21 is closer to the fitting. With the ring 36, the syringe 10 has less and less liquid medicine, and the resistance to push the medicine will become smaller and smaller. When the push block 21 contacts the rear end surface 362 of the fitting ring 36, the center small tapered body 22 of the push block 21 enters the opening of the shaft hole 37, thereby sealing the shaft hole 37, and the push block 21 is almost The rear end surface 362 of the fitting ring 36 is completely closed, and there is no liquid residue remaining between the push block 21 and the fitting ring 36. However, the inevitable drug solution will remain in the shaft hole 37 and the needle body 42, but these amounts are extremely small, which is an amount that is allowed to be ignored, and does not cause a problem of insufficient injection amount of the drug solution, and these retention amounts are also necessary. Because it can prevent air Entering the body causes embolism.

As shown in Figure 6, after the injection is completed, the medical staff withdraws the needle from the patient's skin and muscles. The resistance of the needle 42 is small, and since the joint structure 11 of the joint 30 and the syringe 10 has a tight connection relationship with each other, the needle 42 is not pulled out from the patient, and the joint 30 is not loosened. . Then, after the used needle 40 is disengaged from the syringe 10, the medical staff only pushes the push rod 20 to push forward, and transmits a large thrust to the rear end surface 362 of the fitting ring 36 through the push block 21, Since the rear end surface 362 is a flat surface, the thrust transmitted from the push block 21 can be almost completely received, so that the fitting ring 36 presses the rear annular surface 133 of the limiting convex ring 13 forward because the rear ring The face 133 has a chamfer 134 which can help the fitting ring 36 to be slightly deformed by the pressing, so that it can pass through the intermediate annulus 132 of the limiting collar 13 and, in addition, the fitting The exhaust ring groove 361 of the ring 36 also assists in the slight deformation of the fitting ring 36 when it is squeezed to pass the limit collar 13. When the fitting ring 36 completely passes through the limiting collar 13, the taper tight relationship of the tapered outer wall 32 with the tapered inner wall 12 is released, and the joint 30 is disengaged from the barrel 10 together with the needle 40. It should be noted that the action of removing the needle 40 shown in the sixth figure belongs to the push-unloading type, and is completed by one-hand operation, and the action is exactly the same as the above-mentioned action of pushing the medicine, but only a slight force is applied. Dismounting the needle 40 with one hand is an important function, because when the medical staff withdraws the syringe from the patient, the medical staff holds the syringe in one hand, and the other hand holds the sterile cotton to stop the bleeding at the injection site of the patient, and at this time, the medical care The person can align the barrel of the discarded needle and then press the push rod 20 to release the needle 40, which is very labor-saving and convenient, and completely avoids the unprotected empty window period after the used needle is exposed.

In summary, the present invention advances the structure and combination of the needle-removing safety syringes. The operation mode is completely different from the pull-back safety injection needle, and the invention completely avoids the background of the invention All of the questions regarding the pullback safety needle are described.

10‧‧‧Syringe

101‧‧‧ front end

11‧‧‧ joint structure

20‧‧‧Put

30‧‧‧ joint seat

31‧‧‧ needle joint

311‧‧‧ front end

32‧‧‧Conical outer wall

33‧‧‧Ring socket

34‧‧‧ Limit ring groove

36‧‧‧Chimeric ring

37‧‧‧Axis hole

38‧‧‧ Sockets

40‧‧‧ needle

41‧‧‧ needle seat

42‧‧‧ needle

Claims (5)

An advancement needle-type safety syringe includes: a syringe having a push rod reciprocally movable along an inner wall of the barrel; an inner joint wall of the front end of the barrel; an engagement structure; The utility model comprises a tapered inner wall formed on the front end of the cylinder, a limiting convex ring formed on the inner wall of the cylinder and connected to the rear end of the tapered inner wall, and a continuous shape formed on the inner wall of the cylinder a fitting groove behind the limiting collar; the inner diameter of the barrel defined by the rear end of the tapered inner wall is smaller than the inner diameter of the barrel defined by the front end of the tapered inner wall; and an engaging seat including a needle seat a joint portion and a fitting ring connected to the rear end of the needle joint portion; a shaft hole penetrating the needle seat joint portion and the center of the fitting ring; the joint seat outer wall at the needle seat joint portion and the fitting ring Having a limit ring groove; the needle seat joint has a tapered outer wall, the angle of the tapered outer wall is matched with the tapered inner wall of the joint structure; the needle seat joint has an annular sleeve groove, The annular sleeve groove defines a sleeve column surrounding the shaft hole, and the annular sleeve groove is open to a front end of the needle joint portion; the joint seat is located at the joint structure, the tapered inner wall and the tapered outer wall are closely matched with each other, the limit collar is located in the limit ring groove, and the fitting ring is located at the joint a needle, comprising a hollow needle seat and a needle body connected to the front end of the needle seat; the needle seat is sleeved in the annular socket column. The push-type safety syringe according to the first aspect of the invention, wherein the limiting collar comprises a front annulus, an intermediate annulus, and a rear annulus; the intermediate annulus is coupled to the front torus Between the rear annulus; the front annular surface is formed by a rearwardly tapered diameter from a rear end of the tapered inner wall; the intermediate annular surface is continuous with a minimum diameter portion of the front annular surface, the rear annular surface being a Vertical to the syringe The annular surface of the inner wall; the limiting convex ring is located in the limiting ring groove of the joint seat with the front annular surface and the intermediate annular surface, and the limiting convex ring contacts the annular surface and blocks the front end of the fitting ring The circumference. The needle-unloading safety syringe according to claim 2, wherein the connection between the rear annulus and the intermediate annulus is chamfered. The needle unloading type safety syringe according to the first aspect of the invention, wherein the rear end surface of the fitting ring is a flat surface. The needle unloading type safety syringe according to the first aspect of the invention is characterized in that the circumference of the fitting ring is provided with an exhaust ring groove.