CN110038193A - A kind of syringe needle with protective case - Google Patents

Abstract

The invention belongs to the field of injection infusion sets, and aims to provide a needle with a protective sleeve. The technical solution includes an injection needle and a protective sleeve that can be sleeved on the injection needle, and the protective sleeve and the injection needle are detachably connected. , the protective sleeve, the injection needle, and the syringe to which the injection needle fits are independent of each other, or the protective sleeve and the injection needle are independent of each other, and the protective sleeve is suitable for any national standard syringe. In different usage scenarios, the protective sleeve can be used in conjunction with the injection needle and the syringe, or only the injection needle and the syringe can be used in conjunction with the actual needs. Since the protective sleeve can be applied to all the syringes produced by the national standard on the market, it has a wide range of applications, and the syringe and injection needle can also be used alone without the need for a protective sleeve.

Description

A needle with a protective cover

technical field

The invention relates to the field of medical syringe infusion sets, in particular to a needle with a protective sleeve.

Background technique

Syringes and infusion sets are commonly used products in medical devices.

At present, the Chinese patent with the authorization announcement number CN106031806A discloses a needle safety protective cover structure, which is mounted on the needle base and includes a bending connection mechanism, including a first bending part and a second bending part. The folding part is connected to the needle base, and also includes a protective cover, and the protective cover has a set space.

In the above structure, the needle holder and the needle tube are integrally provided, and the needle tip is integrally provided with the first bending part in the protective sleeve. In many medical scenarios, the use time of the syringe is very short. It takes less time to take out the disposable syringe when it needs to be injected, and then inject the medicine into the patient's body, and it is discarded immediately after the injection. The protective cover in the above documents can protect the syringe when the syringe is temporarily placed, but in actual use, if each needle has a protective cover, and the protective cover and the needle are fixedly connected to the needle is larger than the needle. , which easily affects the convenience of injection.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a needle with a protective sheath, which has the advantages of wide application range and not easy to affect the injection work.

The above-mentioned technical purpose of the present invention is achieved through the following technical solutions:

A needle with a protective sleeve, comprising an injection needle and a protective sleeve that can be sleeved on the injection needle, the protective sleeve and the injection needle are detachably connected, and the protective sleeve, the injection needle, and the syringe adapted to the injection needle The three are independent of each other, or the protective sleeve and the injection needle are independent of each other, and the protective sleeve is suitable for any national standard syringe.

By adopting the above technical solution, in different usage scenarios, the protective sheath can be used in conjunction with the injection needle and the syringe, or only the injection needle and the syringe can be used in conjunction with each other according to actual needs. Since the protective sleeve can be applied to all the syringes produced by the national standard on the market, it has a wide range of applications, and the syringe and injection needle can also be used alone without the need for a protective sleeve.

Further, the protective sleeve includes a sleeve cavity for accommodating the injection needle, a connector located at the end of the sleeve cavity and connected to the injection needle in rotation, and the end of the injection needle connected with the syringe is detachably connected.

By adopting the above technical solution, the detachable connection structure makes the coordination between the injection needle, the syringe and the protective cover more flexible. In the production process, the national standard syringes are mass-produced, the protective cover is separately mass-produced, and then the protective cover needs to be installed. Cover the syringe with a protective cover. This detachable and adaptable structure can effectively improve the mass production efficiency, is not limited to syringes produced by different manufacturers, and has a wide range of applications.

Further, the connecting piece includes a connecting head sleeved with the base of the injection needle bottom, an elastic piece drawn out from the side of the connecting head, and the sleeve cavity is fixedly connected with the elastic piece on a side away from the connecting head.

By adopting the above technical solution, when the syringe with a protective sleeve and the injection needle are inserted into the patient, the sleeve cavity and the injection needle do not affect each other. External force is applied to the sleeve cavity, and the elastic member is deformed at this time.

Further, the inner wall of the connecting head is set as a circular arc surface with interference fit with the bottom of the injection needle, the outer wall of the end of the connecting head facing away from the injection needle is provided with a sealing thread for improving the sealing degree, and the inner wall of the connecting head has a sealing thread part. Fits the shape of the liquid outlet position of the syringe.

By adopting the above technical solution, if only the conventional socket connection method is used to connect the injection needle and the syringe, when the liquid medicine in the syringe is pushed out, the pressure generated is easily transmitted to the injection needle, which affects the reliability of the socket connection; The connection can improve the connection strength and effectively reduce the influence of the axial force of the syringe on the injection needle.

Further, the elastic piece includes at least one elastic piece located between the connecting head and the sleeve cavity, and a limit card group is also arranged between the connecting head and the sleeve cavity, and the limit card group includes a block drawn from the side wall of the connecting head. The first card body and the second card body drawn from the sleeve cavity, the first card body and the second card body collide with each other at least once during the rotation of the sleeve cavity around the connector.

By adopting the above technical solution, when the sleeve cavity is rotated and the sleeve cavity is sleeved on the injection needle, in this process, when the first card body and the second card body collide with each other, an external force is required to make the first card body and the second card body collide with each other. The first card body and the second card body continue to rotate after the collision until the sleeve cavity falls on the injection needle; if there is no external force, when the first card body and the second card body collide with each other, the rotation of the sleeve cavity is resisted and it is difficult to continue to rotate , so as to reduce the probability that the sleeve cavity rotates close to the injection needle during injection and affects the injection of the injection needle.

Further, the surface of the second card body in contact with the first card body is a circular arc surface.

By adopting the above technical solution, the arc surface can reduce the damage caused when the first card body and the second card body collide with each other. The two card bodies are broken.

Further, a shoulder-type structure is set between the part of the connecting head with the sealing thread and the arc surface part of the outer wall of the connecting head.

By adopting the above technical solution, the larger part of the shaft shoulder structure can improve the stability of the overall structure. When the connector is installed on the syringe, the shaft shoulder can just conflict with the end of the syringe, improving the connection the reliability of the structure.

Further, the sleeve cavity is set to be open, and the injection needle falls into the sleeve cavity through the open part. The size of the sleeve cavity is the narrowest near the needle tip of the injection needle. When the sleeve cavity is in use, its end close to the connector is located. The face is perpendicular to the infusion needle.

By adopting the above technical solution, after the sleeve cavity is sleeved on the injection needle, in order to prevent secondary pollution after the injection needle is discarded, there is no need to remove it after the sleeve is sleeved; Compared with the structure in which the two planes are arranged at an angle to each other, the cross section parallel to the connector has a more stable relative positional relationship.

Further, a plurality of mutually staggered limit teeth are arranged in the sleeve cavity, and the angle between the limit teeth and the side wall of the sleeve cavity is set.

By adopting the above technical solution, the limiting teeth are used for jamming the injection needle and preventing the injection needle from coming out of the sleeve cavity.

Further, the axial length of the sleeve cavity is suitable for any infusion needle that meets industry standards, and the group of the limiting teeth farthest away from the syringe is stuck at the needle tip of the injection needle during use, and the needle tip of the injection needle is The oblique cut of the notch is exposed outside the limit tooth.

By adopting the above technical solution, the function of the sleeve cavity is to protect the injection needle, so there should be a uniform limit force applied to each part of the injection needle. Limiting is an effective way to fix the injection needle.

Description of drawings

1 is a schematic diagram of the matching structure of each component used to embody a syringe with a protective sleeve and an injection needle;

FIG. 2 is an enlarged view of FIG. 1 for embodying the structure of the connector;

3 is a schematic diagram of the relative position structure between the injection needle and the protective sleeve;

FIG. 4 is a schematic structural diagram of the enlarged view of part B of FIG. 3 for showing the elastic member.

In the figure, 1, injection needle; 2, protective sleeve; 21, sleeve cavity; 22, connecting piece; 23, sealing thread; 24, limiting tooth; 221, connecting head; 222, elastic piece; 222-1, elastic piece ; 222-2, the limit card group; 222-21, the first card body; 222-22, the second card body.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

Wherein the same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top" "Face", "inner" and "outer" refer to directions toward or away from the geometric center of a particular part, respectively.

A needle with a protective sleeve, as shown in Figure 1, is mostly used on a syringe, including an injection needle 1 and a protective sleeve 2 that can be sleeved on the injection needle 1. The syringe and the injection needle 1 can be produced on the market according to the national standard. Either one can be used with the protective cover 2.

The protective cover 2 and the injection needle 1 are detachably connected, and the protective cover 2, the injection needle 1, and the syringe to which the injection needle 1 fits are independent of each other. For example, the protective cover 2, the injection needle 1 and the syringe are from different manufacturers, but As long as the injection needle 1 and the syringe meet the national standard, the protective cover 2 can be used together with the assembled injection needle 1 and the syringe in the last installation process; or, the protective cover 2 and the injection needle 1 are independent of each other. Under certain circumstances, the semi-finished products that have been assembled can be selected for the syringe and the injection needle 1, and when necessary, a protective cover 2 can be added to these tools that can already meet the injection requirements.

As shown in FIG. 1 , the protective sleeve 2 includes a sleeve cavity 21 for accommodating the injection needle 1, and a connector 22 located at the end of the sleeve cavity 21 and connected to the injection needle 1 in rotation. , and most of them are directly socketed, so the connector 22 of the protective cover 2 is located between the injection needle 1 and the syringe during installation.

As shown in FIGS. 2 and 3 , the connecting member 22 includes a connecting head 221 that is sleeved with the bottom base of the injection needle 1 , and an elastic member 222 drawn out from the side of the connecting head 221 . The sleeve 21 and the elastic member 222 are away from the connecting head 221 Side fixation. Among them, the connecting head 221 is set as two cylindrical pipe parts of different sizes, the two cylindrical tubes are connected with each other, the inner wall is a smooth arc surface, and the end with the larger diameter passes between the needle seat of the injection needle 1 . The needle is seated in the connecting head 221 for a tight fit; the inner wall of the smaller diameter part is a circular arc surface, which is convenient to be sleeved with the cylindrical pipe part of the liquid outlet position of the syringe, and the liquid outlet position of the syringe falls in the connecting head 221. When installing the protective cover 2 of this structure, it only needs to be connected.

As shown in FIG. 2 , in order to improve the sealing performance, a sealing thread 23 is further provided on the outer circular surface of the end with a smaller diameter of the connecting head 221 , and the structure of this sealing thread 23 is adapted to a syringe with a threaded port. The threaded port refers to a cylindrical tube with a diameter larger than the original liquid outlet drawn from the syringe at the coaxial position of the conventional liquid outlet of the syringe, and the inner wall of the cylindrical tube is provided with an inner thread matched with the sealing thread 23 . When installing the protective cover 2 with this structure, the injection needle 1 is sleeved with the connecting head 221 , and the syringe and the connecting head 221 are threadedly connected.

Therefore, on the connector 221, two parts with different diameters are connected coaxially, and there is a shoulder structure at the connection.

As shown in FIGS. 3 and 4 , the elastic member 222 includes at least one elastic piece 222-1 located between the connecting head 221 and the sleeve cavity 21. In this embodiment, two elastic pieces 222-1 are provided, and the elastic pieces 222- 1 is set as a thin plastic sheet drawn out from the sleeve cavity 21 and integrally provided with the sleeve cavity 21 and the connector 221. The thin plastic sheet can withstand a certain degree of bending, and will not easily deform when it is not subjected to external force.

As shown in FIGS. 3 and 4 , a limit card group 222-2 is further provided between the connector 221 and the sleeve cavity 21, and the limit card group 222-2 is located between the two elastic sheets 222-1. The limit card group 222-2 includes a first card body 222-21 drawn from the side wall of the connector 221, and a second card body 222-22 drawn from the sleeve cavity 21. During the rotation of the sleeve cavity 21 around the connector 221, the first card body 222 -21 and the second card body 222-22 collide with each other at least once. The part where the first card body 222-21 and the second card body 222-22 conflict with each other is set as an arc surface. When the first card body 222-21 and the second card body 222-22 are in conflict with each other, external force is required to ensure that the Let the sleeve cavity 21 continue to rotate. If there is no external force, the sleeve cavity 21 will spring back to the initial state after being blocked during the rotation process. The initial state of the sleeve cavity 21 and the axis of the connector 221 are perpendicular to each other. The play range is only between 15° and 30°, so as to reduce the interference of the sleeve cavity 21 to the injection needle 1 during injection.

The sleeve cavity 21 is set in an open shape. When the sleeve cavity 21 is rotated to be close to the injection needle 1, the injection needle 1 falls into the sleeve cavity 21 through the open part. The sleeve cavity 21 is in the shape of a cone as a whole. 1. The needle tip is the narrowest. The sleeve cavity 21 is provided with a number of interlaced limit teeth 24. The angle between the limit teeth 24 and the side wall of the sleeve cavity 21 is set. In this embodiment, the limit teeth 24 and the side where they are located The included angle between the walls is 45°. When the injection needle 1 falls between the limit teeth 24, since every two limit teeth 24 are in a group, a group of limit teeth 24 intersect with each other, that is to say, the limit The end of the positioning tooth 24 away from the side wall of the sleeve cavity 21 will exceed the middle position of the bottom wall of the sleeve cavity 21, and is not connected to the bottom wall of the sleeve cavity 21, so the injection needle 1 touches the limit tooth 24 first, and continues to press down until it reaches the bottom wall of the sleeve cavity 21. The limit tooth 24 is elastically deformed, and the injection needle 1 falls to the side of the limit tooth 24 facing the bottom wall of the casing cavity 21 , that is, in the triangular area formed by the limit tooth 24 and the bottom wall of the casing cavity 21 , and is not easy to come out.

After the sleeve cavity 21 limits the injection needle 1, its end close to the connector 22 is perpendicular to the infusion needle, that is, the larger end surface of the sleeve cavity 21 is parallel to the axial cross section of the syringe.

The axial length of the sleeve cavity 21 is suitable for any infusion needle that conforms to the industry standard, and the group of the limiting teeth 24 farthest away from the syringe is stuck at the needle tip of the injection needle 1 during use, and the oblique incision of the needle tip of the injection needle 1 Exposed outside the limit teeth 24, that is to say, after the injection needle 1 is covered with the sleeve cavity 21, the limit teeth 24 of the three groups of linear arrays in this embodiment just fall in the vicinity of the trisection point of the injection needle 1, And when the national standard injection needle 1 is limited, the position of the needle tip can be limited by the limiting teeth 24 .

This specific embodiment is only an explanation of the present invention, and it does not limit the present invention. Those skilled in the art can make modifications without creative contribution to the present embodiment as required after reading this specification, but as long as the rights of the present invention are used All claims are protected by patent law.

Claims (10)

1. a kind of syringe needle with protective case, special including injection needle (1), the protective case (2) that can be sheathed on injection needle (1) Sign is: being detachably connected between the protective case (2) and injection needle (1), the protective case (2), injection needle (1), injection needle (1) mutually indepedent between mutually indepedent or protective case (2), injection needle (1) between the syringe three being adapted to, the protective case (2) it is suitable for any national standard syringe.

2. a kind of syringe needle with protective case according to claim 1, it is characterised in that: the protective case (2) includes being used for It accommodates the mantle cavity (21) of injection needle (1), be located at the connector (22) that mantle cavity (21) end and injection needle (1) are rotatedly connected, it is described One end that injection needle (1) is connected with syringe is detachably connected.

3. a kind of syringe needle with protective case according to claim 2, it is characterised in that: the connector (22) includes and note The connector (221) for penetrating the socket of needle (1) bottom base, the elastic component (222) drawn from connector (221) side, the mantle cavity (21) it is connected with elastic component (222) away from connector (221) side.

4. a kind of syringe needle with protective case according to claim 3, it is characterised in that: connector (221) inner wall is set It is set to the arc surface with injection needle (1) bottom interference fit, outer wall of the connector (221) away from injection needle (1) one end is equipped with For improving the sealing screw thread (23) of tightness, inner wall and syringe of the connector (221) with sealing screw thread (23) part Drain position shape is agreed with.

5. a kind of syringe needle with protective case according to claim 3, it is characterised in that: the elastic component (222) includes position Between connector (221) and mantle cavity (21) at least one at elastic piece (222-1), between connector (221) and mantle cavity (21) It is additionally provided with limiting card group (222-2), the limiting card group (222-2) includes the first card body drawn from connector (221) side wall (222-21), the second card body (222-22) drawn from mantle cavity (21), mantle cavity (21) is in connector (221) rotation process, and the One card body (222-21) and the second card body (222-22) at least mutually contradict primary.

6. a kind of syringe needle with protective case according to claim 5, it is characterised in that: second card body (222-22) with The face that first card body (222-21) touches is in arc surface.

7. a kind of syringe needle with protective case according to claim 4, it is characterised in that: the connector (221) is with close It seals between the part and connector (221) outer wall arc surface part of screw thread (23) and is set as shaft shoulder type structure.

8. a kind of syringe needle with protective case according to claim 1, it is characterised in that: the mantle cavity (21) is set as open Shape, injection needle (1) are fallen into mantle cavity (21) by open section, mantle cavity (21) size at injection needle (1) needle point most Narrow, mantle cavity (21) is in use, it is vertical with transfusion needle close to face where one end of connector (22).

9. a kind of syringe needle with protective case according to claim 1, it is characterised in that: be equipped in the mantle cavity (21) several Interlaced limiting tooth (24), angle is arranged between limiting tooth (24) and mantle cavity (21) side wall.

10. a kind of syringe needle with protective case according to claim 9, it is characterised in that: the axial direction of the mantle cavity (21) is long Degree is suitable for any transfusion needle for meeting professional standard, is being used in the limiting tooth (24) away from farthest one group of syringe When be stuck at injection needle (1) needle point, and the angular cut of injection needle (1) needle point exposes except limiting tooth at this (24).