CN111820916A - A vacuum blood collection tube integrating a rubber rubber stopper and a plastic tube cap - Google Patents

Abstract

The invention provides a vacuum blood collection tube with an integrated rubber rubber stopper and a plastic tube cap, including a tube cap and a rubber stopper, the top of the tube cap is recessed downward to form a columnar cavity, and the bottom surface of the columnar cavity is provided with a blood collection supply The puncture hole through which the needle passes, the side wall of the cylindrical cavity forms a cylindrical limiting part, and there is a gap between the cylindrical limiting part and the side wall of the cap, and the gap between the two is filled with a rubber plug by two-color injection molding. The upper section of the rubber stopper fills and seals the gap, the inner side of the lower section of the rubber stopper covers the outer side and bottom surface of the column-shaped limiting portion, and the outer side of the lower section of the rubber stopper and the side wall of the cap are reserved for the assembly of the tube body Into the gap, the outer surface of the lower section of the rubber plug forms a rotary body sealing part that is press-sealed with the inner wall of the tube. In the present invention, the rubber stopper is two-color injection molded into the tube cap during production, so that the rubber stopper and the tube cap form a whole, and the structure of the rubber stopper and the tube cap is improved at the same time, so that the sealing effect is better after the tube cap is connected to the tube body, and at the same time The process of installing the rubber stopper is omitted.

Description

A vacuum blood collection tube integrating a rubber rubber stopper and a plastic tube cap

technical field

The invention relates to a medical device, in particular to a vacuum blood collection tube with an integrated rubber stopper and a plastic tube cap by overmolding.

Background technique

The vacuum blood collection tube is mainly used for the collection, storage and preservation of blood samples. At present, the basic structure of the vacuum blood collection tube is composed of a tube body, a rubber rubber stopper, and a plastic cap (ie a safety cap). The rubber stopper passes through the rubber. After vulcanization molding, it is assembled into the plastic cap. This structure has remained largely unchanged for decades. However, the defect of this structure that needs to be improved is that there are many production processes, and in the process of mass production, the preparation and control of materials are difficult. Due to the limitation of product structure and raw materials, the vacuum blood collection tube is prone to some quality defects, such as: the vacuum degree is reduced, the rubber plug is skewed in the tube body, and in the process of collecting blood samples, the collection needle is difficult to puncture, and the needle bounces. etc., need to improve.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention aims to design a new generation of vacuum blood collection tubes that integrates the rubber plug and the plastic cap through the overmolding process, and is suitable for the safety of the tube body. , The application of advanced production technology has not been proposed or invented in the industry at present.

Compared with the existing vacuum blood collection tubes in the industry, the technical solution of the present invention not only improves the safety, reliability and stability, but also saves the assembly process of the rubber stopper, and breaks the relatively backward based on the original product. The structural limitations set by the production process provide the quality and functional points that need to be met during the use of the vacuum blood collection tube, that is, the vacuum degree is maintained, the negative pressure for blood collection is stable, the blood collection is convenient and reliable, and the transportation and storage are safe and reliable. A whole new solution and solution idea.

The technical solution of the present invention is a vacuum blood collection tube with an integrated rubber stopper and a plastic tube cap by overmolding, including a plastic tube cap and a rubber rubber stopper. The top of the plastic tube cap is recessed downward to form a columnar cavity, The bottom surface of the cylindrical cavity is provided with a puncture hole for the blood collection needle to pass through, the side wall of the cylindrical cavity forms a cylindrical limiting portion, and a gap is left between the cylindrical limiting portion and the side wall of the plastic cap, and the two The upper part of the rubber stopper fills and seals the gap, the inner side of the lower part of the rubber stopper covers the outer side and bottom surface of the column-shaped limit part, and the rubber stopper The outer side of the lower section and the side wall of the plastic cap leave a gap for the pipe body to be assembled into. The outer side of the lower section of the rubber plug forms a rotary body sealing part that is squeezed and sealed with the inner side wall of the pipe, and the pipe body can be selected from PET material.

Preferably, the innovatively designed rubber stopper, compared with the existing vacuum blood collection tubes, the shape and structure of the above-mentioned newly designed rubber stopper has a flat bottom surface and is in extrusion contact with the orifice of the tube body, so that the integrated The rubber stopper cap component, after being press-fitted into the tube body, forms the first sealing area between the caps from the outside to the inside due to the resilience of the rubber, that is, the annular plane at the top of the opening of the tube body. Seal area.

Preferably, the rotary body sealing portion is provided with a raised annular sealing rib in the horizontal direction.

Preferably, the number of the annular sealing ribs is 2-4, and the annular sealing ribs are vertically spaced and parallel to each other.

At the same time, as an innovatively designed plastic pipe cap, the special design of the column-shaped limit part on it adds a ring-shaped plastic inner wall structure to the pipe cap, so as to play the following two functions:

1) Provide a rigid support structure for supporting the annular sealing rib of the rubber plug, which improves and improves the reaction force generated by the sufficient compression of the annular sealing rib, that is, the rebound force, and improves the sealing function;

2) It is firmly and safely bonded to each other with the rubber stopper

Therefore, when the annular sealing rib is squeezed by interference, sufficient resilience is generated, and the lasting and safe sealing function of the rubber plug is exerted.

Preferably, the innovatively designed annular sealing rib enables the integrated rubber plug and plastic cap to form between the plastic caps from outside to inside due to the resilience of the rubber after they are press-fitted into the tube body. 3-5 sealing areas, that is, 2-4 sealing areas located on the inner wall of the open end of the pipe body. At the same time, the 2-4 annular sealing ribs, through the innovative design of structure and size, realize the moderate interference fit between the inner diameter of the pipe, which not only ensures the sealing effect, but also takes into account the integrated rubber plug. Neutrality and smoothness requirements when the helmet enters the pipe body.

Preferably, the part of the rubber plug at the puncture hole is spherical, and this part is the only channel position for the blood collection needle to puncture into the vacuum blood collection tube.

Among them, the innovatively designed rubber stopper has a thickness of 1.4mm-3mm at the crown of the bulb. The above-mentioned unique shape, structure and thickness of the rubber stopper crown shape ensure that the rubber stopper has an appropriate resilience when it is pressed. , and can be punctured and pierced smoothly by the needle tip of the blood collection needle. Compared with the existing vacuum blood collection tube, especially the resistance of the blood collection needle to pierce the rubber stopper, as well as the traversing distance and thickness are reduced.

Preferably, an annular retaining rib is provided on the inner side of the outer side wall of the plastic cap corresponding to the position of the sealing portion of the rotary body.

Preferably, the inner side of the outer side wall of the plastic cap is provided with an oblique engaging rib at a position corresponding to the sealing portion of the rotary body; the outer surface of the top of the pipe body is provided with a corresponding oblique engaging rib.

Preferably, as an innovative design, at the inner wall of the integrated plastic pipe cap and the outer side wall of the upper end region of the pipe body, by arranging mutually cooperating oblique engaging ribs, between the plastic pipe cap and the pipe body, there is provided The structure of integrally connecting the tube body and the plastic tube cap through rotation makes the tube body and the tube cap the two originally separated parts, with a new shape structure that is firmly connected to each other, so as to play the role of safety, locking and limiting. The function of bit matching, so as to meet the requirements of stable and reliable sealing required to maintain the vacuum degree of the vacuum blood collection tube.

Compared with this new design structure, the existing vacuum blood collection tube does not have the function and structure of mutual clamping between the rubber rubber stopper, the plastic tube cap and the tube body. The maintenance of the vacuum degree can only come from the interference fit generated by the resilience and friction of the rubber plug. Therefore, the connection stability between the plastic cap and the tube body is relatively poor during storage and transportation.

Preferably, the number of the oblique engaging ribs on the inner side wall of the plastic cap is two, and they are arranged at a relative angle of 180°; the number of the oblique engaging ribs on the pipe body is two, and they are arranged at a relative angle of 180°. .

Preferably, the length of the oblique engaging rib on the pipe body is less than the diameter of the pipe body, and the length of the oblique engaging rib on the pipe cap is less than the diameter of the pipe cap; the oblique engaging rib and the horizontal clamp The angle is 20° to 25°.

Preferably, the cross-section of the columnar cavity is cylindrical, regular triangle, square, regular pentagon or regular hexagon.

Preferably, the inner side wall of the bottom end of the plastic cap is provided with a chamfer.

Preferably, the outer side wall of the plastic cap is provided with vertical anti-skid ribs.

The present invention has fully considered the production process and production cost when designing the product structure. In production, the production process adopted is the plastic injection molding process. The method is as follows: injection molding the rubber plug into the plastic pipe cap, so that the rubber rubber plug and the plastic pipe cap form a whole.

At the same time, after optimizing the structural design of the rubber plug and the plastic pipe cap, the sealing effect is better after the plastic pipe cap is connected to the pipe body, and the process of installing the rubber plug is omitted.

Description of drawings

Fig. 1 is a kind of structural representation of the present invention;

FIG. 2 is a schematic structural diagram of another viewing angle of FIG. 1;

Fig. 3 is the front view of Fig. 1;

4 is a cross-sectional view of FIG. 3 along the A-A direction;

Fig. 5 is the exploded structure schematic diagram of Fig. 4;

Fig. 6 is the structural representation after Fig. 4 is inserted into the pipe body;

7 is a schematic diagram of a second structure of the present invention;

FIG. 8 is a schematic structural diagram of another viewing angle of FIG. 7;

Figure 9 is a front view of Figure 7 after the pipe body is installed;

10 is a cross-sectional view of FIG. 9 along the B-B direction;

Fig. 11 is the structural representation of the pipe body in Fig. 9;

Among them: 1—plastic cap; 2—rubber plug; 3—cylindrical cavity; 4—puncture hole; 5—cylindrical limit part; 6—revolving body sealing part; 7—annular sealing rib; 8—annular Positioning rib; 9—oblique clamping rib; 10—anti-slip rib.

Detailed ways

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

Embodiment 1, as shown in Figures 1 to 6, the present invention provides a vacuum blood collection tube with an integrated rubber stopper and a plastic cap, including a plastic cap 1 and a rubber stopper 2. The plastic cap 1 The top is recessed downward to form a columnar cavity 3, the bottom surface of the columnar cavity 3 is provided with a puncture hole 4 for the blood collection needle to pass through, and the side wall of the columnar cavity 3 forms a columnar limit portion 5, and the columnar limit There is a gap between the part 5 and the side wall of the plastic cap 1. The gap between the two is filled with a rubber plug 2 by overmolding. The upper section of the rubber plug 2 fills and seals the gap. The rubber plug 2 The inner side of the lower section covers the outer side and bottom surface of the columnar limiting portion 5, and fills the interior of the puncture hole 4. The outer side of the lower section of the rubber plug 2 and the side wall of the plastic cap 1 leave a gap for the insertion of the pipe body. The outer side of the lower section of the rubber plug 2 forms a rotary body sealing portion 6 that is squeezed and sealed with the inner side wall of the pipe. The clamping rib 8 increases the frictional force to prevent the pipe body from falling off.

Embodiment 2, as shown in Figures 7 to 11, the present invention provides a vacuum blood collection tube with an integrated rubber stopper and a plastic tube cap, including a plastic tube cap 1 and a rubber rubber stopper 2. The plastic tube cap 1 The top is recessed downward to form a columnar cavity 3, the bottom surface of the columnar cavity 3 is provided with a puncture hole 4 for the blood collection needle to pass through, and the side wall of the columnar cavity 3 forms a columnar limit portion 5, and the columnar limit There is a gap between the part 5 and the side wall of the plastic cap 1. The gap between the two is filled with a rubber plug 2 by overmolding. The upper section of the rubber plug 2 fills and seals the gap. The rubber plug 2 The inner side of the lower section covers the outer side and bottom surface of the column-shaped limiting portion 5, and fills the interior of the puncture hole 4. The outer side of the lower section of the rubber plug 2 and the side wall of the plastic cap 1 leave a gap for the pipe body to be assembled into. , the outer side of the lower section of the rubber plug 2 forms a rotary body sealing portion 6 that is squeezed and sealed with the inner side wall of the pipe, and the inner side of the outer side wall of the plastic pipe cap 1 is provided with two corresponding positions of the rotary body sealing portion 6. There are two oblique engaging ribs 9 separated by 180°; two oblique engaging ribs 9 separated by 180° are correspondingly arranged on the outer surface of the top of the pipe body. The length of the oblique engaging ribs 9 on the pipe body is is smaller than the diameter of the pipe body, the length of the oblique engaging ribs 9 on the plastic pipe cap 1 is smaller than the diameter of the plastic pipe cap 1, and the angle between the oblique engaging ribs 9 and the horizontal direction is 20° to 25°, wherein, Most preferably between 21° and 22°.

On the basis of the above two technical solutions, a plurality of local features have preferred embodiments:

Preferably, the cross-section of the cylindrical cavity 3 is cylindrical, regular triangle, square, regular pentagon or regular hexagon, and the most preferred way is to use regular hexagon, which can be used with an Allen wrench, which is also convenient for Grab and rotate during assembly.

Preferably, the sealing part 6 of the rotary body is provided with a raised annular sealing rib 7 along the horizontal direction to improve the sealing between the rubber plug 2 and the inner side wall of the pipe. The interference extrusion between the walls forms a separate sealing area.

Preferably, the number of the annular sealing ribs 7 is 2-4, the annular sealing ribs 7 are arranged at intervals along the vertical and parallel to each other, and the annular sealing ribs 7 pass through the inner wall of the pipe body. When extruded, 2-4 independent isolated sealing areas are formed to enhance the sealing effect.

Preferably, the bottom surface of the upper section of the rubber plug 2 is flat and is in extrusion contact with the nozzle of the tube body, wherein the tube body can be made of PET material, so that the bottom surface of the upper section of the rubber plug 2 and the tube body are pressurized and deformed to produce a seal. segment area.

Preferably, the inner side wall of the bottom end of the plastic pipe cap 1 is provided with a chamfer, which is convenient for guiding when the plastic pipe cap 1 is inserted into the pipe body.

Preferably, the outer side wall of the plastic cap 1 is provided with vertical anti-skid ribs 10 for easy operation.

In the present invention, the rubber plug 2 is overmolded into the plastic pipe cap 1, so that the two are combined to form a whole, which will not fall off during use, and omits the later assembly process. At the same time, the structure of the plastic cap 1 itself is improved, and the structure of the columnar stopper 5 is newly added. The columnar stopper 5 itself has a certain rigidity, and the columnar stopper 5 is not easy to be compressed when the tube body is inserted into the cap. Internal deformation, so that the rubber plug 2 wraps the cylindrical limit part 5 and achieves a good sealing effect through its own elastic deformation under the interference extrusion of the tube body, unlike the previous rubber plugs, which have a large inward appearance. Deformation leads to unsatisfactory sealing effect. The annular sealing rib 7 provided on the rotary body sealing part 6 of the rubber plug 2 also further improves the sealing effect with the inner wall of the pipe. In addition, in Example 1, the inner side of the outer side wall of the plastic pipe cap 1 is provided with a ring-shaped retaining rib 8, and the outer side wall of the pipe is squeezed to increase the friction force between the two to prevent the pipe body from falling off later, so that the inner side wall of the pipe and the The rotary body sealing part 6 of the lower section of the rubber plug 2 is further squeezed to improve the sealing effect. In Example 2, the cooperating extrusion between the oblique clamping ribs 9 is used to produce a structure similar to a threaded connection, which prevents the pipe body from falling off later, so that the top of the pipe body is pressed against the rubber plug 2 to further improve the sealing effect, while the rubber The elastic deformation of the rubber plug 2 acts on the top of the tube body, so that the top of the tube body is subjected to downward elastic reaction force. Due to the specific inclination angle of the oblique engaging ribs 9, the self-locking function can be achieved, effectively connecting the tube body and the plastic cap. 1 are connected together to maintain a stable and reliable sealing state.

When the present invention is in use, the additive is put into the tube body. In Example 1, the plastic tube cap 1 is aligned with the tube body and inserted in place. The annular retaining rib 8 on the inner surface of the outer side wall of the cap 1 is squeezed on the outer side wall of the pipe to increase the frictional force, and the annular sealing rib 7 on the rotary body sealing part 6 of the lower section of the rubber plug 2 squeezes the inner side wall of the pipe And produce deformation, relying on the elastic reaction force to achieve the sealing effect, in the second embodiment, the plastic pipe cap 1 is directly rotated and connected to the pipe body through the oblique clamping ribs, and the rubber plug is deformed to achieve sealing and self-locking fixation. At the same time, the column-shaped limiting portion 5 is on the inside of the rubber plug 2 to limit the inward deformation of the rubber plug 2 and improve the reliability of the sealing between the annular sealing rib 7 and the inner wall of the tube; insert the vacuuming needle into the puncture hole 4 The rubber stopper 2 penetrates and penetrates, and the vacuuming equipment is started to pump the negative pressure in the tube to the standard set value. After the vacuum needle is pulled out, the rubber stopper 2 seals the needle hole under its own plastic deformation and becomes a vacuum blood collection tube. . In the later blood collection, the puncture end of the venous blood collection needle is used to penetrate the skin into the blood vessel, and the puncture end of the tube plug of the venous blood collection needle penetrates the rubber plug 2 in the puncture hole 4 of the vacuum blood collection tube to realize the blood collection process. The whole operation is safe and reliable, the use is simple and convenient, the sealing effect is significantly improved compared with the previous blood collection tube, and the storage life of the vacuum blood collection tube is also greatly improved.

The above are only preferred embodiments of the present invention, and do not limit the invention in any form. Any simple modifications, equivalent changes or modifications made to the above embodiments according to the technical principles of the present invention still belong to the present invention. within the scope of the technical solution of the invention.

Claims (10)

1. A vacuum blood collection tube integrated with a rubber stopper and a plastic cap, comprising a plastic cap (1) and a rubber stopper (2), characterized in that: the top of the plastic cap (1) is formed by concave downward. A cylindrical cavity (3), the bottom surface of the cylindrical cavity (3) is provided with a puncture hole (4) for the blood collection needle to pass through, and the side wall of the cylindrical cavity (3) forms a cylindrical limiting portion (5), There is a gap between the cylindrical limiting portion (5) and the side wall of the plastic cap (1), and the gap between the two is filled with a rubber plug (2) by double-color injection molding, and the upper section of the rubber plug (2) is filled with To seal the gap, the inner side of the lower section of the rubber stopper (2) covers the outer side and bottom surface of the columnar stopper (5), and the outer side of the lower section of the rubber stopper (2) is connected to the plastic cap (1). ) There is a gap in the side wall for the pipe body to be assembled into, and the outer side of the lower section of the rubber plug (2) forms a rotary body sealing part (6) that is squeezed and sealed with the inner side wall of the pipe. 2 . The vacuum blood collection tube with integrated rubber plug and plastic cap according to claim 1 , wherein a raised annular seal is provided along the horizontal direction at the sealing portion ( 6 ) of the rotary body. 3 . tendons (7). 3 . The vacuum blood collection tube integrating a rubber rubber stopper and a plastic cap according to claim 2 , wherein the number of the annular sealing ribs ( 7 ) is 2-4, and the annular The sealing ribs (7) are vertically spaced and parallel to each other. 4 . The vacuum blood collection tube with integrated rubber stopper and plastic cap according to claim 2 , wherein the bottom surface of the upper section of the rubber stopper ( 2 ) is flat and squeezed with the nozzle of the tube body. 5 . Press contact seal. 5. The vacuum blood collection tube with integrated rubber stopper and plastic cap according to claim 1, characterized in that: the inner side of the outer side wall of the plastic cap (1) corresponds to the rotary body sealing part (6). ) is provided with an annular clamping rib (8). 6. The vacuum blood collection tube with integrated rubber stopper and plastic cap according to claim 1, characterized in that: the inner side of the outer side wall of the plastic cap (1) corresponds to the rotary body sealing part (6). ) is provided with an oblique engaging rib (9); a corresponding oblique engaging rib (9) is provided on the outer surface of the top of the pipe body. 7. The vacuum blood collection tube with integrated rubber stopper and plastic cap according to claim 6, characterized in that: the oblique engaging rib (9) on the inner side wall of the plastic cap (1) is The number is two, and they are set relative to 180°; the number of the oblique engaging ribs (9) on the pipe body is two, and they are set relative to 180°. 8 . The vacuum blood collection tube with integrated rubber stopper and plastic tube cap according to claim 6 , wherein the length of the oblique engaging ribs (9) on the tube body is less than the diameter of the tube body, 9 . The length of the oblique engaging rib (9) on the plastic pipe cap (1) is smaller than the diameter of the plastic pipe cap (1); the angle between the oblique engaging rib (9) and the horizontal direction is 20° to 25° . 9 . The vacuum blood collection tube integrated with a rubber stopper and a plastic cap according to claim 1 , wherein the cross section of the cylindrical cavity ( 3 ) is cylindrical or regular triangle or square or regular five A polygon or a regular hexagon. 10 . The vacuum blood collection tube with integrated rubber stopper and plastic tube cap according to claim 1 , characterized in that: the inner side wall of the bottom end of the plastic tube cap ( 1 ) is provided with a chamfer, and the plastic tube The outer side wall of the cap (1) is provided with vertical anti-skid ribs (10).

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