Sampling needle and detection device

Abstract

The present invention discloses a sampling needle and sample detection device. The sampling needle comprises a needle head portion and a needle body portion connected to the needle head portion. The needle body portion is hollow and has a sampling channel hole therein. A sampling hole connected to the sampling channel hole is formed on the side wall of the needle body portion. The distance between the vertex of the blind end of the sampling hole and the axis of the sampling channel hole is less than the cross-sectional radius of the sampling channel hole. This facilitates thorough cleaning of the inner wall of the sampling needle, thereby improving the reliability of the detection results.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a sampling needle and a detection device. Background Art

[0002] Sampling needles are widely used in medical devices such as testing equipment, especially blood analysis equipment. During use, the sampling needle pierces the sample tube and needs to absorb the sample to be tested in the sample tube through the sampling hole set on the side wall of the sampling needle and the sample channel connected to the sampling hole.

[0003] In the existing technology, the drilling accuracy of the sampling hole is required to be high. Once the hole is excessively drilled, a pit will be formed on the inner wall of the sampling needle. During the process of inputting liquid through the sample channel to clean the inner wall of the sampling needle, the cleaning liquid cannot reach the pit, forming a cleaning dead corner, which affects the accuracy of the test results.

[0004] During the long-term research and development process, the inventors of the present application discovered that the inner wall of the existing sampling needle is prone to sample residue, cannot be thoroughly cleaned, and has poor reliability of the detection results. Summary of the Invention

[0005] The main technical problem solved by the present invention is to provide a sampling needle and a detection device, which are convenient for thoroughly cleaning the inner wall of the sampling needle and are conducive to improving the reliability of the detection results.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a sampling needle.

[0007] Among them, the sampling needle includes:

[0008] needle head;

[0009] A needle body portion, the needle body portion is connected to the needle head portion, the needle body portion is hollow and has a sampling channel hole inside, and a sampling hole connected to the sampling channel hole is opened on the side wall of the needle body portion;

[0010] Wherein, the distance from the vertex of the blind end of the sampling hole to the axis of the sampling channel hole is smaller than the cross-sectional radius of the sampling channel hole.

[0011] In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a detection device.

[0012] Wherein, the detection device comprises:

[0013] The device body and any sampling needle are connected to the device body through a delivery pipeline.

[0014] The beneficial effects of the present invention are as follows: different from the prior art, the distance between the blind end vertex of the sampling hole and the axis of the sampling channel hole of the present invention is smaller than the cross-sectional radius of the sampling channel hole, so that the blind end of the sampling hole maintains a certain distance from the side wall of the sampling channel hole, thereby having a larger dimensional tolerance when processing the sampling hole, and no pit-shaped liquid path dead zone will be formed on the inner wall of the needle body, which facilitates the thorough cleaning of the inner wall of the needle body and is beneficial to improving the reliability of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0016] Figure 1 This is a schematic structural diagram of a first embodiment of a sampling needle according to the present invention;

[0017] Figure 2 This is a schematic structural diagram of a second embodiment of a sampling needle according to the present invention;

[0018] Figure 3 This is a schematic structural diagram of a cross section along the axis of the sampling hole in one embodiment of a sampling needle of the present invention;

[0019] Figure 4 This is a schematic structural diagram of a third embodiment of a sampling needle according to the present invention;

[0020] Figure 5 It is a structural schematic diagram of an embodiment of a detection device of the present invention. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] See Figure 1 , Figure 11 is a schematic structural diagram of a first embodiment of a sampling needle according to the present invention. The sampling needle 40 includes a needle head 300, a needle body 400, and a transition portion 430. The needle body 400 is connected to the needle head 300. The needle body 400 is hollow and has a sampling channel hole 410 inside. A sampling hole 420 connected to the sampling channel hole 410 is formed on the side wall of the needle body 400. The distance from the vertex 430 of the blind end of the sampling hole 420 to the axis of the sampling channel hole 410 is less than the cross-sectional radius d of the sampling channel hole 410.

[0023] In this embodiment, the distance from the vertex of the blind end of the sampling hole 420 to the axis of the sampling channel hole 410 is less than the cross-sectional radius d of the sampling channel hole 410, so that the vertex 430 of the blind end of the sampling hole 420 maintains a distance from the side wall 440 of the sampling channel hole 410, thereby having a larger dimensional tolerance when processing the sampling hole 420, and no pit-shaped liquid path dead zone will be formed on the inner wall of the needle body 400, which facilitates thorough cleaning of the inner wall of the needle body 400 and helps improve the reliability of the detection results.

[0024] In this embodiment, the vertex 430 of the blind end of the sampling hole 420 includes the following two situations. When the axis 421 of the sampling hole 420 and the end 411 of the sampling channel hole 410 are collinear, or when the axis 421 of the sampling hole 420 is farther from the needle head 300 than the end 411 of the sampling channel hole 410, the vertex 430 of the blind end of the sampling hole 420 is the connection point between the blind end of the sampling hole 420 and the end 411 of the sampling channel hole 410. When the axis 421 of the sampling hole 420 is closer to the needle head 300 than the end 411 of the sampling channel hole 410, the vertex 430 of the blind end of the sampling hole 420 is the maximum distance from the blind end of the sampling hole 420 to the axis of the sampling channel hole 410. This ensures that the vertex 430 of the blind end of the sampling hole 420 maintains a distance from the sidewall 440 of the sampling channel hole 410, facilitating thorough cleaning of the inner wall of the needle body 400.

[0025] Optionally, the needle head 300 can be an open needle head with a uniform cross-sectional dimension, or a needle head with a gradually varying cross-sectional dimension. To improve the efficiency of puncturing the sample tube to be tested, the needle head 300 is a needle head with a gradually varying radial dimension. Specifically, the needle head 300 includes a first end 310 and a second end 320, and the cross-sectional dimension of the needle head 300 gradually increases from the first end 310 to the second end 320. In addition, a circular surface 330 transitions between the first end 310 and the second end 320. The arc of the circular surface 330 is less than 90 degrees, such as 30 degrees, 45 degrees, 60 degrees, or 80 degrees. The arc can be determined based on the required puncturing force provided by the needle head 300 and the radial dimension of the needle body 400 to achieve a better puncture effect. The circular shape of the first end 310 can prevent the first end 310 from bending or breaking during puncture of the sample tube. The sampling needle 40 is made of medical stainless steel, and its diameter is 0.1-2 mm, such as 0.1 mm, 0.5 mm, 1 mm or 2 mm.

[0026] Furthermore, in the process of drilling to form the sampling hole 420, by controlling the drilling depth so that the blind end of the sampling hole and the sampling channel hole are kept a certain distance away from the side wall of the sampling hole 420, it is possible to avoid the formation of a pit on the wall of the needle body 400 due to excessive drilling depth, making the use of the sampling needle 40 more convenient.

[0027] Furthermore, in order to simplify the preparation process of the sampling hole 420 and improve production efficiency, the blind end of the sampling hole 420 is an arc end, that is, the arc-shaped blind end formed by the gradual advancement of the drill bit during the drilling process is retained, and there is no need to process the arc-shaped blind end into a regular shape with sharp corners. In addition, the axis 421 of the sampling hole 420 and the end 411 of the sampling channel hole 410 are on the same straight line or staggered with each other, which can reserve sufficient positional dimensional tolerances for the processing of smaller sampling holes 420, reduce process difficulty and improve production efficiency. Of course, according to different usage requirements, the relative position of the axis 421 of the sampling hole 420 and the end 411 of the sampling channel hole 410 can be precisely controlled by using precision drilling equipment or drilling technology, and no specific restrictions are made here. In addition, when the axis 421 of the sampling hole 420 is in the same straight line as the end 411 of the sampling channel hole 410 or the axis 421 of the sampling hole 420 is farther away from the needle head 300 than the end 411 of the sampling channel hole 410, the cleaning liquid can completely flush the sampling hole 420, which is conducive to the cleaning liquid thoroughly cleaning the sampling hole 420.

[0028] Typically, the sample tube is under negative pressure. The process of sucking the sample under negative pressure into the sampling needle by driving force not only takes a long time to adjust the pressure, but also requires more energy to be provided by the driving mechanism. In one embodiment, please refer to Figure 2 , Figure 2This is a schematic structural diagram of a first embodiment of a sampling needle according to the present invention. A groove 610 is provided on the outer wall of the sampling needle 60. The groove 610 is in the shape of an elongated strip and extends along the length of the needle body 600. During the process of the sampling needle 60 piercing the rubber stopper of the sample tube and entering the sample tube, the groove 610 can introduce air into the sample tube, facilitating the sampling needle 60 to absorb the sample to be tested in the sample tube, thereby improving sampling efficiency. Optionally, the distance between the starting end of the groove 610 and the second end 520 is less than 5 times the diameter of the needle body 600, such as 3 times. This facilitates the introduction of air into the sample tube as soon as possible after the sampling needle 60 pierces the rubber stopper of the sample tube to balance the pressure inside and outside the sampling tube, thereby improving sampling efficiency.

[0029] In another embodiment, the cross-section of groove 610 is rectangular, circular, semicircular, or U-shaped, or a combination thereof. The cross-sectional shape of groove 610 can be flexibly configured based on the size of the sampling needle and the production environment of the sampling needle, as long as air can be introduced into the sample tube. Optionally, to simplify the production process, the cross-sectional shape of groove 610 is rectangular.

[0030] For further information, please refer to Figure 3 , Figure 3 This is a schematic structural diagram of a cross section along the axis of the sampling hole in an embodiment of a sampling needle 80 of the present invention. The size of the groove 810 gradually decreases in the direction away from the bottom of the groove, that is, the size of the groove 810 near the outer wall of the sampling needle 80 is smaller. Reducing the size of the notch 811 on the outer wall of the sampling needle 80 can prevent debris generated when the sample needle 80 pierces the rubber stopper of the sample tube from entering the groove 810, and also prevent the sample to be tested from being contaminated. Optionally, in order to prevent debris generated when the sample needle 80 pierces the rubber stopper of the sample tube from entering the groove and to simplify the production process, the cross section of the groove 810 is trapezoidal. In addition, in order to further allow air to circulate more smoothly in the groove 810 and enter the sample tube more quickly, the cross section of the groove 810 is approximately circular.

[0031] For further information, please refer to Figure 3 The number of grooves 810 can be set according to the volume of the sample tube and the size of the sampling needle 80. For example, when the volume of the sample tube is large, the number of grooves 810 is greater than two. Furthermore, the grooves 810 are evenly distributed on the periphery of the sampling needle 80. Furthermore, the sampling hole 820 and the groove 810 are set at different positions on the periphery of the sampling needle 80, that is, the position of the sampling hole 820 of the sampling needle 80 on the outer wall of the sampling needle 80 does not overlap with the position of the groove 810 along the axis of the sampling needle 80. That is, when the sampling hole 820 is located at Figure 3 In the middle position, the axis of the groove 810 cannot be located Figure 3The axis 801 is positioned in the groove 810, thereby preventing the debris on the cut surface of the plug from entering the sampling hole 820 when the sampling needle 80 pierces the plug of the sample tube and interfering with the collection of the sample to be tested.

[0032] Optional, please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of a third embodiment of a sampling needle according to the present invention. The groove 910 includes a first groove portion 911, a second groove portion 912, and a third groove portion 913, which are sequentially arranged and interconnected along the axial direction of the sampling needle 90. The first groove portion 911 and the second groove portion 912 each smoothly transition into the sampling needle 90. Furthermore, the distal end 9111 of the first groove portion 911 and the distal end 9131 of the third groove portion 913 are arcuate ends, and the first groove portion 911 and the third groove portion 913 smoothly transition into the sampling needle through the arcuate ends.

[0033] Optionally, the second groove portion 912 has the same cross-sectional area at all locations perpendicular to its extension direction, enabling continuous and stable air flow into the sample tube. The cross-sectional areas of the first groove portion 911 and the third groove portion 913 gradually decrease as they move away from the second groove portion 912, and the cross-sectional areas of the first groove portion 911 and the third groove portion 913 are both smaller than the cross-sectional area of the second groove portion 912. In other words, the cross-sectional area of the groove 910 is smaller at the ends and larger in the middle, making the groove 910 more streamlined and facilitating smooth air flow.

[0034] In addition, the needle body 900 includes a transition portion 920 and an extension portion 930 connected to one end of the transition portion 920. The other end of the transition portion 920 is connected to the second end 82, and the diameter of the transition portion 920 gradually increases from the same diameter as the second end 82 to the same diameter as the extension portion 930. The first groove 911 is at least partially disposed on the transition portion 920.

[0035] In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a detection device. Figure 5 , Figure 5 It is a structural schematic diagram of an embodiment of a detection device of the present invention.

[0036] The detection device 1 includes: a device body 20 and any sampling needle 10, the sampling needle 10 is connected to the device body 20 through a delivery pipeline 30, and is used to transport the sample to be tested sucked by the sampling needle 10 to a designated position in the device body 20.

[0037] Specifically, the sampling channel hole 30 provided in the sampling needle 10 has a blind end at one end near the needle head of the sampling needle 10 and an open end at the other end away from the needle head. A sampling hole connected to the sampling channel hole is also provided on the side wall of the sampling needle 10, and the open end of the sampling needle 10 is connected to the pipeline 30. During use, the needle head of the sampling needle 10 pierces the rubber stopper of the sample tube and continues to extend into the sample tube until the sampling hole can obtain enough sample to be tested. The sampling needle 10 stops moving further and the power device is started, so that the sample to be tested contained in the sample tube enters the sampling hole and is transported to a designated position in the device body 20 through the sampling channel hole and the pipeline 30 connected to the sampling channel hole. Furthermore, the detection device 1 is a blood sample analyzer, in particular a blood cell analyzer.

[0038] In summary, the present invention discloses a sampling needle and sample detection device. The sampling needle comprises: a needle head; a needle body connected to the needle head, the needle body being hollow and having a sampling channel hole therein; and a sampling hole in communication with the sampling channel hole, formed on a sidewall of the needle body. The distance between the connection point between the blind end of the sampling hole and the sampling channel hole and the axis of the sampling channel hole is less than the cross-sectional radius of the sampling channel hole. This facilitates thorough cleaning of the inner wall of the sampling needle, thereby improving the reliability of detection results.

[0039] The above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sampling needle, characterized in that: The sampling needle comprises: needle head; A needle body portion, the needle body portion is connected to the needle head portion, the needle body portion is hollow and has a sampling channel hole inside, and a sampling hole connected to the sampling channel hole is opened on the side wall of the needle body portion; The sampling hole is formed by drilling, and the drill bit is gradually advanced on the needle body to form a blind end of the sampling hole, and the distance from the vertex of the blind end of the sampling hole to the axis of the sampling channel hole is less than the cross-sectional radius of the sampling channel hole; Wherein, the vertex of the blind end of the sampling hole is set to: When the axis of the sampling hole and the end of the sampling channel hole are in the same straight line or the axis of the sampling hole is farther away from the needle head than the end of the sampling channel hole, it is the connection point between the blind end of the sampling hole and the end of the sampling channel hole; When the axis of the sampling hole is closer to the needle head than the end of the sampling channel hole, the point on the blind end of the sampling hole where the distance from the axis of the sampling channel hole is the maximum.

2. The sampling needle according to claim 1, characterized in that The blind end of the sampling hole is an arc end.

3. The sampling needle according to claim 1, characterized in that The needle head portion includes a first end and a second end. The cross-sectional size of the needle head portion gradually increases from the first end to the second end. The needle body portion is connected to the second end of the needle head portion.

4. The sampling needle according to claim 1, characterized in that A groove is provided on the outer wall of the sampling needle. The groove is in the shape of an elongated strip and extends along the length direction of the needle body.

5. The sampling needle according to claim 4, characterized in that: The cross section of the groove is rectangular, circular, semicircular or U-shaped or a combination of the above.

6. The sampling needle according to claim 4, characterized in that The size of the groove gradually decreases along the direction away from the groove bottom.

7. The sampling needle according to claim 4, characterized in that The sampling hole and the groove are arranged at different positions on the periphery of the sampling needle.

8. The sampling needle according to claim 4, characterized in that: The groove includes a first groove portion, a second groove portion and a third groove portion which are sequentially arranged along the axial direction of the sampling needle and are interconnected. The first groove portion and the third groove portion respectively transition smoothly with the sampling needle.

9. The sampling needle according to claim 8, characterized in that: The cross-sectional areas of the second groove portion at all locations perpendicular to the extending direction thereof are the same, and the cross-sectional areas of the first groove portion and the third groove portion gradually decrease in a direction away from the second groove portion.

10. A detection device, characterized in that: The detection device comprises a device body and the sampling needle according to any one of claims 1 to 9, wherein the sampling needle is connected to the device body via a delivery pipeline.

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