WO2003008024A1

WO2003008024A1 - Safety syringe needle connecting structure

Info

Publication number: WO2003008024A1
Application number: PCT/CN2001/001193
Authority: WO
Inventors: Xiping Wang; Bizhu Zhang; Xiaopeng Wang
Original assignee: Xiping Wang; Bizhu Zhang; Xiaopeng Wang
Priority date: 2001-07-20
Filing date: 2001-07-20
Publication date: 2003-01-30

Abstract

A safety syringe needle connecting structure comprises a syringe barrel, a needle connector, the front end of needle connector has a outer tapered surface engaged with the needle connect hole, characterized in: The outer cylindrical surface of the needle connector matching with the inner hole of the syringe barrel is provided with at least one groove. Slots are axially provided on the front end of the barrel to form lock boards, which can bend elastically. The number of the lock boards corresponds to the number of the grooves. The location of the lock board corresponds to that of the groove, the lock boards can be pressed into the grooves for locating the needle connector axially and circularly.

Description

TECHNICAL FIELD

The invention relates to two improved safety syringe needle connection and replacement structures, and belongs to the technical field of medical health.

Background technique

The emergence of safety syringes has played an important role in preventing "needling"-cross-infection caused by needle stick puncture after use. However, there are three major problems in the design of most safety syringes:

1. Most designs use special needles instead of the standard 6% luer connector needles for better assembly and replacement. This is because the standard needle is connected and sealed by taper friction. Due to manufacturing errors and long-term storage, the connection may fail or fall off. However, most of the safety syringe pull-back devices and the needle's joint "connector" cannot bear a large axial load, otherwise it is difficult to pull the needle back into the syringe. Therefore, a considerable part of the design or patent uses non-standard needles. Most are connected by a screw, such as patents US005431631A, CN 1206351A. This method of connection is simple and reliable, but the disadvantage is that special injection needles must be produced separately, which is an obstacle to widespread use.

2. Some designs or patents that use standard needles. In order to facilitate the operation of installing or changing needles, some devices are used to lock the connector. Such syringes in Japan, for example, have a rotatable retaining ring with a shaft on the front side of the syringe. When it is turned inward, the connector can be locked and cannot be retracted, which is convenient for reinstalling and replacing the needle. After replacement, rotate the snap ring outwards, and the connector can be pulled back into the syringe. The limiting structure of the connector at the front end of this product is shown in Figures 7A and 7B. A slot 161 is located at the front of the cylindrical surface 16; a rotatable card plate 8 is mounted on the front surface 37 of the syringe 3 through a pin 7, and a ball pin 82 is provided on the card plate 8 for easy operation. The card plate 8 is approximately one and a half The thickness of the ring is slightly smaller than the width of the groove 161. When it is turned to the position shown by the solid line in FIG. 7B, the card board 8 enters the groove 161 of the connector 1, thereby locking the connector 1 in the axial direction. When performing operations such as puncturing or installing a needle vertically, the connector 1 can withstand axial thrust and keep its position from moving in the axial direction. When the card board 8 is pushed to rotate outward to the two-dot chain line position in FIG. 7B, the card board 8 releases the axial locking effect on the connector 1, and allows the connector 1 and the needles thereon to be withdrawn into the syringe. 3 within.

This method is reliable, but the problems are as follows: 1. The structure is complicated, at least it needs to be Adding two parts brings an increase in assembly workload; 2. This method cannot limit the rotational movement of connector 1 and therefore cannot withstand the rotating torque, which is detrimental to ensuring the reliability of the needle installation; 3. It is necessary to increase the push-in during use With the pull-out operation, the operation operation increases.

3. In the current more advanced pull-back skew needle structure, the pollution caused by the residual blood left by the needle cannot be completely avoided. As shown in FIG. 6A: After injection of the existing safety syringe, when the needle 2 is pulled back into the syringe 3, to prevent the needle tube 22 from protruding out of the syringe 3 again, the needle 2 is biased toward the syringe 3 by the structural force. Hole wall, when the needle tube 22 enters the syringe 3, the needle tube 22 will contact the outer end of the inner hole 31, and the residual blood BD stained thereon will hang on the end surface 37 of the syringe 3, because the end surface 37 is The exposed surface, so contaminated residual blood BD may still infect doctors and patients. Relevant statistics show that the safety performance of safety syringes is greatly improved compared to traditional syringes, but it still cannot completely prevent the occurrence of syringe infections. The inventor believes that the structural defects of the existing safety syringes described above are an important cause of infection.

Description of the invention

In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to reduce the operation action without increasing the number of structural parts, make the operation of replacing the needle easier and more convenient, and increase the joint fastness of the standard needle.

The object of the present invention is achieved as follows:

Solution one: A safety syringe needle connection structure includes a syringe and a needle connector that can be moved axially inside a hole in the front end of the syringe. The outer surface of the front end of the needle connector is a conical surface for the sleeve of the needle connection hole. It is characterized in that at least one groove is provided on the outer cylindrical surface where the front end of the needle connector is matched with the inner hole of the front end of the syringe, and the front end of the syringe is provided with a straight groove in the axial direction to form an elastically bendable card board corresponding to the number of grooves. The position of the clamp plate corresponds to the groove, and the groove can be inserted into the groove to squeeze the needle connector axially and circumferentially at the same time.

The number of grooves is preferably two, and the axes are symmetrical with each other. The front end of the syringe is provided with four straight grooves to form two symmetrical elastically bendable clamping plates. The positions of the two clamping plates correspond to the two grooves. The pressure-embedable groove positions both the needle connector axially and circumferentially.

The front end of the inner hole of the syringe is provided with a step hole.

The large diameter end of the conical surface of the tip of the needle connector is a sharp rough surface, and the outer envelope of the sharp rough surface is outside the extension of the smooth outer surface of the small diameter end.

The pointed rough surface may be any of a zigzag shape, a thread shape, or a knurl shape.

Solution two: a safety syringe needle connection structure, including a syringe and a sleeve placed on the front end of the syringe A needle connector that can be moved axially in the hole. The outer surface of the front end of the needle connector is a conical surface for sleeve connection of the needle connection hole. It is characterized in that: a through groove is opened in the front end of the syringe, and the diameter of the root of the cone of the connector is Two grooves are symmetrically arranged upward and downward, and a U-shaped clamping plate is also provided. The two arms at the front end of the clamping plate can be inserted into two slots surrounded by the through groove and the groove to position the needle connector axially and circumferentially at the same time.

With the above two embodiments, both the axial and circumferential positioning of the needle connector can be achieved simultaneously when the needle is replaced or reinstalled.

In the first solution, the needle cylinder is held when changing needles, and two fingers are respectively held at the upper and lower card positions. Due to the pressure of the fingers, the card is elastically bent toward the axis and enters the connector groove. The groove is appropriately selected. The depth and the width of the clamp plate can ensure that the connector is restricted by the clamp plate from being able to retreat or rotate along the axis, and the needle can be easily reinstalled or replaced in the field.

With the second solution, when the needle is to be installed or replaced, the card board is inserted into the groove of the needle connector along the straight groove of the needle cylinder. Then, the connector cannot be moved axially by the card board, nor can it be rotated along the axis. It can withstand the axial assembly thrust and rotational force distance when installing the needle, and easily reinstall or replace the needle on site. This solution only adds a simple card board accessory, and it is only used when the site needs to be reinstalled or the needle is replaced, so the increase in production cost is small.

The technical measure to improve the fastness of the needle joint is to divide the 6% Luer tapered surface of the connector or the needle base with the needle into two parts. The first half (about 1/2 of the mating length) is kept as a conical surface, and the second half is as follows Changes: 1. Change the tapered surface to a pointed surface, so that after the needle is loaded, the needle will cooperate with the corresponding surface of the tapered surface to deform under the force of assembly, thereby increasing the joint fastness; 2. The sharp rough surface The outer enveloping surface is outside the extension line of the smooth outer surface of the small diameter end (for example, about 0.1 ~ 0.2mm), which is larger than the inner diameter of the tapered hole of the needle with which it is fitted, thereby increasing the fitting fastness of this part.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention and its advantages are further described below with reference to the drawings and embodiments.

FIG. 1 is a connection diagram of a standard needle and a connector in the prior art;

2 is a schematic structural diagram of a first embodiment of the present invention;

Figure 3 is a left side view of Figure 2;

FIG. 4 is a perspective view of the connection base 1 in FIG. 2.

5 is a perspective view of the front end of the syringe 3 in FIG. 2;

6A is a schematic diagram of residual blood contamination at the front end of the syringe 3 in FIG. 1; Figure 6B is a functional schematic diagram of the structure of the present invention to prevent residual blood pollution; Figure 7A, B is a schematic structural diagram of the front end of a Japanese safety syringe product;

Figure 8 is one of the improved 6% Luer connector schemes;

FIG. 9 is an enlarged sectional view of FIG. 8;

Figure 10 is the second of the improved 6% Luer connector scheme;

Figure 11 is the third of the improved 6% Luer connector scheme;

12 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 13 is a left side view of FIG. 12;

Fig. 14 is a perspective view of the connector 1 in Fig. 12;

FIG. 15 is a perspective view of the card board 6 in FIG. 12;

Fig. 16 is a perspective view of the front end of the syringe 3 in Fig. 12.

K drawing number description 2

1 ·

1 1… Outer cone 11 1… Front end 112 'Rear end 1121… Slope

1 122 • Slope 13 ... Groove 131 ... Front side 132 ... Bottom side

14 · Sealing groove 16 ... Cylinder surface 161 ... Groove 17 ... Front end surface

18 · 'Groove 183 ... bottom surface 1831 ... contact point 1832 ... contact point

-Needle

21-Inner cone 22 ... Needle tube

-Syringe

31 · 'Inner hole 32 ... Step hole 33 ... Card board 331 ... Sharp point

34- 34 '... Straight groove 35 ... End face 36 ... Sealing groove

37- 'front face 38 ... inner face

311 "bottom surface 31 11 ... contact point 3112 ... contact point

4 ·-Sealing ring 5… Needle jacket 6… Card board 61 ··· Front side

7 · 'Pin 8… Card 82… Ball BD… Residual blood

detailed description

Figure 1 is a view of a standard 6% Luer fitting mating with a connector in an existing safety syringe. It can be seen that the joint surface of the inner cone surface 21 of the standard needle 2 and the outer cone surface 11 of the connector 1 is a simple cone surface. When the cone angles are the same and the mating dimensions are the same, more reliable connection stability can be obtained. Manufacturing errors, which greatly affects the reliability of cooperation, which is common for ordinary Syringes do not cause substantial difficulties, but for most safety syringes, it is difficult to reinstall them after they are released. This is because the connector 1 can slide back inside the syringe 3 so that after the injection is completed, Pull the needle back into the barrel. Therefore, the connector 1 cannot withstand the large axial thrust force into the syringe when installing the needle, and it cannot withstand the additional rotational force distance.

Figures 9, 10, and 11 are three structural solutions to increase the needle tightening force. Its common features are: the standard 6% Luer mating cone surface 1 1 is divided into a seal portion a front end 11 1 and a locking portion a rear end 112, and the front end 111 is still a standard 6% Luer cone surface (about half of the contact length) The rear end 112 uses a cuspid surface: FIG. 9 uses a sawtooth cross section, and the angle between the inclined surface 1121 and the cone axis along the increasing direction of the tapered surface is small to facilitate needle insertion; The angle between 1122 and the axis of the cone is large. And the outer envelope surface of the rear end 112 is outside the extension line of the smooth outer surface of the small diameter end (such as about 0.1 ~ 0.2mm), as shown in FIG. 9, that is, the outer envelope surface of the rear end 112 is higher than the front surface 111 A smaller amount △ is larger than the inner diameter of the tapered hole of the needle with which it is fitted, so that the fitting fastness of this part can be increased. It can be seen that when the needle 2 is forced into the conical surface, because the needle cover is a thin-walled part made of plastic, a certain plastic deformation will inevitably occur when it is in strong contact with the surface of this tine. As a result, the force required to loosen the syringe is greatly increased, which significantly increases the stability of the joint.

Fig. 10 shows a portion of the rear end 112 which is formed into a cusp thread shape with a small wheelbase. Different from some patents that use threaded connection: The threaded connection is often a non-standard needle cover with internal thread, while the present invention only uses canines to deform the inner hole of the needle cover.

Fig. 11 is a method of knurling the surface of the rear end 112 into point-shaped tines, which also achieves deformation of the tapered hole in the needle cover to increase stability. Of course, the same purpose can be achieved by using other tine-like structures.

Either solution must use a close-tooth structure to ensure that as many tines as possible come into contact with the inner surface of the needle to compensate for too few engaging teeth caused by variations in the joining length caused by manufacturing errors, which affects joint reliability .

Figures 2 to 5 are the first practical solution of the present invention to achieve connector locking, including a needle connector 1, a needle 2; a syringe 3; a sealing ring 4; and a needle jacket 5.

The cylindrical surface 16 of the needle connector 1 is matched with the inner hole 31 at the front end of the syringe 3 and can slide thereon. The cylindrical surface 16 is provided with two opposite grooves 13, and the groove bottom may be flat or inclined as shown. Considering the strength of the plastic, the distance between the front wall of the groove 13 and the front end surface 17 of the needle connector 1 should be more than 0.5 mm; the maximum width of the groove 13 is limited to not affecting the sealing performance of the sealing groove 14. As shown in FIGS. 3 and 5, the front end of the syringe 3 defines four straight grooves 34 and 34 ′ parallel to the vertical plane passing through the axis. The width of the grooves 34 and 34 'is based on the minimum width that can be achieved by the injection mold (eg, 0.2 to 0.8 mm). The length is limited to not communicate with the sealing groove 36. Generally, the width B between the two straight grooves 34 or 34 'may be about half the diameter of the cylindrical surface 16 of the syringe 3 and the connector 1. In this way, two elastically bendable clamping plates 33 can be formed at the front end of the syringe 3.

A step hole (stop) 32 is made at the front end of the inner hole 31 of the syringe 3, and its diameter should be about 1 mm larger than the inner hole 31. The width of the step 32 should be such that the clamping plate 33 is deformed inward, and the end face 35 of the step 32 It can enter the groove 13 of the connector 1, that is, the distance A ′ between the end surface 35 and the sealing groove 36 should be smaller than the distance A from the front wall 131 of the groove 13 on the connector 1 to the sealing groove 14. The end surface 35 may be perpendicular to the axis, or may be slightly inclined backward by an angle of α, so that when the clamping plate 33 is bent inwardly, it can form a good contact with the front end surface 131 of the groove of the connector 1.

The stepped hole 32 at the front end of the syringe 3 also has an important safety function, as shown in FIG. 6A. After the existing safety syringe is injected, the needle 1 is pulled back into the syringe 3 to prevent the needle tube 22 from protruding the needle again. Outside the barrel 3, the needle is biased towards the wall of the hole of the barrel 3 by the structural force. When the barrel 22 enters the barrel 3, the barrel 22 will contact the edge of the inner hole 31, and the residual blood BD attached to it will hang. On the end surface 37 of the syringe 3, since the end surface 37 is an externally exposed surface, residual blood BD may still be in contact with doctors and patients, and infection may occur; and after the step 32 is added to the present invention, the residual blood BD on the needle tube 22 It can only hang on the inner end surface 35. Because the amount of residual blood BD attached to the needle tube 22 is extremely limited, it is impossible to flow to the outer end surface 37 of the syringe 3, preventing doctors and patients from contacting the outer end surface 37 The possibility of infection with residual blood on the surface further improves the safety performance of the safety syringe.

It can be seen that this structure has no effect on normal production, assembly, and use. It is only required that the groove 13 of the connector 1 and the clamping plate 33 on the syringe 3 are aligned during assembly, which is not difficult to achieve. When the connector 1 and the needle tip 2 are retracted into the syringe 3 after the injection, the card 33 is not stressed and is not deformed, and is in the original position, that is, the inner end surface 35 is not in contact with the end surface 131 of the groove 13 on the connector 1 contact. Therefore, the retracting of the connector 1 into the syringe 3 is not restricted.

As shown in FIG. 2 to FIG. 5, in the field of use, if the needle 2 is to be reinstalled or replaced, the upper and lower clamping plates 33 need only be pinched with fingers, and the clamping plate 33 is elastically bent and deformed due to pressure. Entering the groove 13 on the connector 1, that is, the inner end surface 35 of the card plate 33 is lowered to the rear position of the inner end surface 131 of the groove 13 of the connector 1, and the two sharp points 331 on the inner surface of the card plate 33 will abut on The bottom plane 132 of the groove 13. Obviously, because the inner end surface 35 of the clamping plate 33 on the syringe 3 abuts on the inner end surface 131 of the groove 13 of the connector 1, the connector 1 is restricted from moving inwardly to the syringe 3 under the axial thrust of the loaded needle. move. The process of transmitting the axial thrust generated by the needle installation is: the inner end surface 131 of the connector 1 → the inner end surface 35 of the clamping plate 33 on the syringe 3—the clamping plate 33—the syringe 3, during which the connector 1 receives an axial Limiting, thereby preventing the connector 1 from retracting into the syringe 3, thereby rendering the syringe ineffective; and because the two upper points 331 on the clamping plate 33 are in contact with the bottom surface 132 of the groove 13 on the connector 1, thereby limiting the The connector 1 rotates around its own axis. That is, the rotation torque applied to the needle sleeve 5 when the needle is installed is transmitted to the connector 1 through the needle 2 so that it has a tendency to rotate. As described above, this rotation torque is formed by the two sharp points 331 on the clamping plate 33 The balance of torque prevents the connector 1 from turning, so that the operation of replacing the needle can be easily and smoothly completed. After changing the needle, release the finger holding the clamp plate 33 of the syringe 3, and the clamp plate 33 is elastically reset, the restriction on the connector 1 is lifted, and all the original functions of the syringe can be restored.

This design has several significant advantages:

1. This structure can simultaneously bear the axial thrust and rotation torque of the installation needle, which completely solves the problem of using the field assembly or replacement of the needle, and also improves the fastness of the needle installation and makes it safer to use.

2. The step hole 32 can further prevent accidental infection, thereby further improving the safety performance of the syringe.

3. The operation of installing the needle is extremely simple. It only requires pinching the position of the card board with your fingers, without any unnecessary action.

4. The structure uses standard injection needles, which is very versatile and therefore more acceptable to medical staff.

5. The structure is concise, it does not need to add any new parts or complicated assembly requirements, that is, it basically does not increase production costs, and it is also convenient for injection molding production.

The second practical solution for locking the connector according to the present invention is shown in Figs. 12 to 16, and its structural features are as follows:

1. Make two opposite flat-bottom grooves 18 at the root of the cone matching the connector 1 and the needle 2; the depth should be greater than 0.5mm;

2. A straight groove 311 is formed on the front end surface 37 of the syringe 3, and its depth is preferably greater than the thickness C of the card plate 6 to be described below, and its width D 'should be slightly larger than the width D of the card plate 6.

3. The card board 6 is a thin plate-like part with an open groove. The thickness C of the card board 6 must be a certain strength and slightly smaller than the width C of the groove on the connector 1. The width E of the open groove is slightly larger than the connection. The distance E1 between the two bottom surfaces of the two grooves 18 on the device 1.

When using or assembling, insert the clamping plate 6 into the slot at the front of the connector 1 and the syringe 3 at the same time, as shown in the figure. As shown in Figs. 12 and 13, when the injection needle 2 is installed, the axial thrust is transmitted from the inner hole of the needle 2 to the front side 61 of the clamping plate 6 through the outer tapered surface 11 of the connector 1, and then to the inner end surface 38 of the syringe 3. Thus, the movement of the connector 1 in the axial direction is prevented; and the rotational torque of the mounting needle 2 is transmitted to the syringe 3 through the two inner contact points 1831 and 1832, the card board 6 and the two external contacts 3111 and 3112, so that The connector 1 is prevented from rotating about the axis relative to the syringe 3. The extension part on the right side of the card board in FIG. 9 is convenient for the operator to hold it by hand.

After the card board 6 is removed after installation, the connector 1 can resume the function of moving into the syringe 3. Compared with the solution of a Japanese company shown in Figure 7, this solution is reliable. There is no requirement on the position of the hand grip of the syringe 3 when the needle 1 is installed. The structure of the additional slot and the clamping plate 6 is simple, and it is easy to process and produce. .

Industrial applicability

The invention completely solves the problem of using a field assembly or replacement needle, and also improves the fastness of the needle installation, and has the advantages of safer use, further prevention of accidental infection, simple installation operation, strong versatility, and convenient injection molding production. The application will produce good social benefits and significant economic benefits.

Claims

Rights request

1. A safety syringe needle connection structure, comprising a syringe, a needle connector sleeved axially in a hole at the front end of the syringe, the outer surface of the front end of the needle connector is a conical surface for sleeve connection of the needle connection hole, It is characterized in that at least one groove is provided on the outer cylindrical surface where the front end of the needle connector is matched with the inner hole of the front end of the barrel, and the front end of the barrel is provided with a straight groove in the axial direction to form an elastically bendable card board corresponding to the number of grooves. The position of the clamp plate corresponds to the groove, and the groove can be inserted into the groove to squeeze the needle connector axially and circumferentially at the same time.

2. The safety syringe needle connection structure according to claim 1, characterized in that: the number of the grooves is two and the axes are symmetrical with each other, and the front end of the syringe is provided with four straight grooves to form two symmetrical cans. The elastically bent card board has two card board positions corresponding to the two grooves, and can be inserted into the grooves by squeezing to position the needle connector axially and circumferentially at the same time.

3. The safety syringe needle connection structure according to claim 1, characterized in that-the front end of the inner hole of the syringe is provided with a step hole.

4. The safety syringe needle connection structure according to claim 1 or 2 or 3, characterized in that: the large diameter end of the conical surface at the front end of the needle connector is a sharp rough surface, and the outer surface of the sharp rough surface is an outer envelope. Outside the extension of the smooth outer surface at the end of the small diameter.

5. The safety syringe needle connection structure according to claim 4, wherein the pointed rough surface is any one of a zigzag shape, a thread shape or a knurled shape.

6. A safety syringe needle connection structure, comprising a syringe, a needle connector sleeved in the hole at the front end of the syringe and axially movable, and the outer surface of the front end of the needle connector is a conical surface for sleeve connection of the needle connection hole. The utility model is characterized in that: a through groove is radially opened at the front end of the syringe, two grooves are symmetrically opened up and down in the root of the cone joint of the connector, and a U-shaped clamping plate is provided. Within the two slots enclosed by the groove, the needle connector is positioned both axially and circumferentially.

7. The safety syringe needle connection structure according to claim 6, wherein the large diameter end of the conical surface at the front end of the needle connector is a sharp rough surface, and the outer envelope surface of the sharp rough surface is smooth at the small diameter end. The outer surface of the extension line is outside.

8. The safety syringe needle connection structure according to claim 7, wherein the pointed rough surface is any one of a zigzag shape, a thread shape or a knurled shape.