A type of rubber stopper for vacuum blood collection tubes

Abstract

This utility model discloses a rubber stopper for vacuum blood collection tubes, relating to the field of medical device technology. The rubber stopper body (1) is designed with differentiated hardness in different areas, with the central puncture area (2) and the outer support area (3) configured differently. The support area has a higher hardness than the puncture area, and the two areas are seamlessly connected by rubber coating. The blind hole (4) at the top of the puncture area provides puncture compression space to reduce rebound resistance. The outer edge (5) of the support area and the snap-fit ​​groove (6) work together to enhance the sealing contact area, and the circumferentially distributed expansion and contraction grooves (7) improve the radial deformation capacity. This structure breaks through the technical limitations of traditional single-hardness rubber stoppers, reducing puncture resistance while maintaining sealing performance and preventing the rubber stopper from falling off when the needle is removed.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a rubber stopper for vacuum blood collection tubes. Background Technology

[0002] Vacuum blood collection tubes, as shown in CN221997846U, are test tubes with caps that are pre-evacuated to different degrees of vacuum. They automatically and quantitatively collect venous blood samples using this negative pressure. One end of the lancet is inserted into a vein, and the other end is inserted into the rubber stopper of the vacuum blood collection tube. Inside the vacuum blood collection tube, under negative pressure, the venous blood is drawn into a sample container through the lancet.

[0003] Traditional vacuum blood collection tubes generally use butyl rubber stoppers to maintain the vacuum level within the working range to ensure smooth blood collection, specimen stability, and testing accuracy. The blood collection needle penetrates the rubber stopper to enter the tube. The hardness and friction of the rubber stopper must ensure smooth puncture while preventing the needle from springing back or the rubber stopper from falling off when the needle is withdrawn.

[0004] The invention patent application with publication number CN119875252A provides a rubber composite material, as well as a rubber formulation provided by similar related patents, which contains a reinforcing agent mainly composed of inorganic fillers, and the hardness of the rubber can be adjusted by adjusting the content of the reinforcing agent. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rubber stopper for vacuum blood collection tubes with a regional hardness structure, thereby solving the technical problem that the prior art requires balancing the hardness and friction of the rubber stopper, which leads to a large limitation in the selection of rubber stoppers.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows: A rubber stopper for vacuum blood collection tubes includes a stopper body, wherein the middle part of the stopper body is a puncture area and the outer periphery is a support area. The rubber hardness of the support area is greater than that of the puncture area, and the puncture area and its outer side are integrally connected by the rubber-coated support area.

[0007] Furthermore, the top surface of the puncture area is provided with an axially extending blind hole. This reduces puncture resistance by compressing the stroke by 3-5 mm.

[0008] Furthermore, the upper circumferentially extended outer edge of the support area is provided. This increases the sealing contact area and improves the vacuum holding time.

[0009] Furthermore, a locking groove is provided at the connection between the lower part of the support area and the outer edge. This forms a mechanical locking structure, which improves the bonding effect between the rubber stopper and the vacuum blood collection tube without affecting the needle withdrawal force.

[0010] Furthermore, the outer wall of the support area is provided with a plurality of expansion and contraction grooves evenly distributed along the circumference.

[0011] Furthermore, the axial depth of the blind hole is 1 / 3 to 3 / 4 of the height of the rubber plug body.

[0012] Furthermore, the radial extension width of the outer edge is 0.5-1.2 times the wall thickness of the support area.

[0013] Furthermore, the puncture area uses low-hardness rubber of Shore A type 45±3 degrees, and the support area uses high-hardness rubber of Shore A type 55±3 degrees.

[0014] The advantages and beneficial effects of this utility model are as follows: The vacuum blood collection tube rubber stopper overcomes the technical problem of traditional single-hardness rubber stoppers in achieving both puncture resistance and self-sealing effect by combining the hardness difference between the puncture area and the support area. The rubber coating molding achieves seamless connection between the two areas, avoiding the risk of interface delamination. The blind hole compression space in the puncture area reduces the puncture rebound force, the outer edge of the support area expands the sealing contact surface, and the expansion and contraction groove increases the radial deformation to improve the sealing performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the mold structure for independently forming the puncture area of ​​this utility model;

[0018] Figure 4 This is a schematic diagram of the mold structure for secondary forming of the support area of ​​this utility model;

[0019] Reference numerals: 1-Plug body, 2-Puncture area, 3-Support area, 4-Blind hole, 5-Outer edge, 6-Snap-fit ​​groove, 7-Expansion groove. Detailed Implementation

[0020] This utility model provides a vacuum blood collection tube rubber stopper, including a stopper body 1. The stopper body 1 is divided into a central puncture area 2 and an outer peripheral support area 3. The rubber in the puncture area has a Shore A hardness of 45±3 degrees, while the rubber in the support area 3 has a Shore A hardness of 55±3 degrees. The molding method involves first preparing... Figure 3 The puncture zone 2 structure is shown, and then the puncture zone structure is placed in a rubber stopper molding mold, and a support zone 3 structure is prepared on its outer side. The rubber used for puncture zone 2 and support zone 3 is preferably the same type of rubber, such as butyl rubber. Different hardnesses can be achieved by adjusting the component content of the reinforcing filler. The reinforcing filler includes, but is not limited to, at least one of nano-calcium carbonate, nano-magnesium carbonate, and nano-titanium oxide.

[0021] In the embodiment shown in this paper, the puncture zone 2 is made of butyl rubber with a nano-calcium carbonate filling amount of 15%-20%, and the support zone is made of nano-calcium carbonate with a filling amount of 25%-30%. The molding process is performed in steps. In the first step, the mold molding temperature is 175℃±5℃, and the pressure holding time is 300s to form the puncture zone 2. In the second step, the support zone 3 is wrapped with rubber material in the corresponding mold.

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] Example 1

[0024] Please see Figures 1-4 This embodiment provides a rubber stopper for vacuum blood collection tubes, including a stopper body 1, a puncture area 2 in the middle of the stopper body, and a support area 3 on the outer periphery. The rubber in the support area has a Shore A hardness of 55, and the rubber in the puncture area has a Shore A hardness of 45. The puncture area 2 and its outer side are integrally connected by the rubber-coated support area 3. A blind hole 4 is provided on the top surface of the puncture area 2, and an outer edge 5 is provided on the top surface of the support area. The length of the blind hole is 1 / 2 of the height of the stopper body. The radial extension width of the outer edge is 0.5 times the wall thickness of the support area.

[0025] Example 2

[0026] A vacuum blood collection tube stopper differs from Example 1 only in that the rubber hardness of the support area is Shore A 52, and the rubber hardness of the puncture area is Shore A 48. The length of the blind hole is 3 / 4 of the height of the stopper body. The radial extension width of the outer edge is 1 times the wall thickness of the support area.

[0027] Example 3

[0028] A vacuum blood collection tube stopper differs from Example 1 only in that the rubber hardness of the support area is Shore A 58, and the rubber hardness of the puncture area is Shore A 42. The length of the blind hole is 1 / 3 of the height of the stopper body. The radial extension width of the outer edge is 1.2 times the wall thickness of the support area.

[0029] Example 4

[0030] A type of rubber stopper for vacuum blood collection tubes differs from that in Example 1 only in that the outer periphery of the support area 3 is provided with 6 expansion and contraction grooves, and the vacuum blood collection tube connected thereto is provided with a guide plate adapted to the expansion and contraction grooves 7, and the expansion and contraction grooves 7 and the guide plate are interference fit.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A rubber stopper for a vacuum blood collection tube, comprising a rubber stopper body (1), characterized in that: The rubber stopper body (1) has a puncture area (2) in the middle and a support area (3) on the outer periphery. The rubber hardness of the support area (3) is greater than that of the puncture area (2). The puncture area (2) and the support area (3) are integrally connected by the rubber-coated support area (3). ​ 2. The rubber stopper for a vacuum blood collection tube according to claim 1, wherein: The top surface of the puncture area (2) is provided with an axially extending blind hole (4).

3. The rubber stopper for a vacuum blood collection tube according to claim 2, wherein: The upper circumferential extension of the support area (3) forms an outer edge (5).

4. The rubber stopper for a vacuum blood collection tube according to claim 3, wherein: A snap-fit ​​groove (6) is provided at the connection between the lower part of the support area (3) and the outer edge (5). ​ 5. The rubber stopper for vacuum blood collection tubes according to any one of claims 1-4, characterized in that: The outer wall of the support area (3) is provided with multiple expansion and contraction grooves (7) evenly distributed along the circumference.

6. The rubber stopper for a vacuum blood collection tube according to claim 2, wherein: The axial depth of the blind hole (4) is 1 / 3 to 3 / 4 of the height of the rubber plug body (1).

7. The rubber stopper for a vacuum blood collection tube according to claim 3, wherein: The radial extension width of the outer edge (5) is 0.5-1.2 times the wall thickness of the support area (3).

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