Preset blood sample collector and push rod

Abstract

The utility model discloses a preset blood sample collector and a push rod, and belongs to the technical field of medical instruments. The collector is provided with a sample storage cavity and comprises a sample storage shell, a push rod, a piston and a venting plug, the push rod is provided with a first end and a second end which are oppositely arranged, the first end is arranged in the sample storage shell, the second end is exposed out of the sample storage shell, and the piston is installed at the first end of the push rod; the push rod is provided with an exhaust channel, the exhaust plug is plugged between the exhaust channel and the sample storage cavity, one end, close to the liquid inlet of the sample storage shell, of the exhaust plug is configured as an air inlet end, a part of the piston shields the outside of the air inlet end, and a gap is formed between the air inlet end and the piston. According to the collector provided by the invention, one part of the piston shields the outside of the air inlet end, and the gap is formed between the air inlet end and the piston, so that blood can be prevented from being in contact with the exhaust plug too early, the contact time of the blood and the exhaust plug is delayed, the blood collection amount is ensured, gas is prevented from being fused into a blood sample, and the accuracy of blood gas analysis can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a preset blood sample collector and a push rod. Background Art

[0002] Blood gas analysis is used to obtain indicators of human blood, which can provide indispensable and important reference materials for the diagnosis of diseases. It is widely used in the diagnosis of diseases such as acid-base imbalance and hypoxemia in the human body and the treatment of critically ill patients. Blood gas analysis has special requirements for blood samples. Specifically, the samples cannot come into contact with air during blood collection, inspection and storage. The preset type receptacle for arterial blood specimen collection is mainly used for the collection and storage of human arterial blood samples. Before blood collection, the piston is preset to the blood collection scale. During the blood collection period, the blood sample automatically flows into the sample storage chamber by the human arterial pressure. The collector is equipped with an exhaust device, which is closed after contacting the blood, which can block the liquid and isolate the air. In the existing preset blood sample collector, the exhaust device is prone to contact with blood too early, especially when used to collect blood samples from patients with high blood pressure. Due to the high blood pressure, the blood enters the sample storage chamber at a faster rate. Before the blood fills the sample storage chamber, it first contacts the exhaust device to seal it, resulting in insufficient blood collection and affecting the accuracy of blood gas analysis. In addition, the closure of the exhaust device prevents the gas in the sample storage chamber from being discharged, and the gas is integrated into the blood sample, which also affects the accuracy of blood gas analysis. Utility Model Content

[0003] The present application provides a preset blood sample collector and a push rod, which can solve the technical problem of low accuracy of blood gas analysis of the preset blood sample collector.

[0004] To solve the above technical problems, the present application provides, on the one hand, a preset blood sample collector, which is provided with a sample storage cavity for storing blood samples, and comprises a sample storage shell, a push rod, a piston and an exhaust plug, wherein the sample storage shell forms part or all of the side walls of the sample storage cavity, the push rod has a first end and a second end which are arranged opposite to each other, the first end is built into the sample storage shell, and the second end is exposed outside the sample storage shell, and the piston is installed at the first end of the push rod; the push rod is provided with an exhaust channel, the exhaust plug is sealed between the exhaust channel and the sample storage cavity, the end of the exhaust plug close to the liquid inlet of the sample storage shell is configured as an air inlet end, a part of the piston is blocked outside the air inlet end, a gap is provided between the air inlet end and the piston, the air inlet end is partially or completely exposed to the air, the adjacent space of the air inlet end is connected to the sample storage cavity, and the exhaust plug and the exhaust channel are configured as an exhaust channel for the gas in the sample storage cavity.

[0005] On the other hand, the present application provides a push rod, which is used in a preset blood sample collector. The push rod has a first end and a second end that are relatively arranged, and the piston is installed at the first end of the push rod; the push rod is provided with an exhaust channel, the exhaust plug is sealed in the exhaust channel, the part of the exhaust plug close to the first end is configured as an air inlet end, a part of the piston is blocked outside the air inlet end, a gap is provided between the air inlet end and the piston, the air inlet end is partially or completely exposed to the air, and the exhaust plug and the exhaust channel are configured as an exhaust channel for the gas in the sample storage chamber.

[0006] The preset blood sample collector provided by the present application has a portion of the piston blocked outside the air inlet end, which can prevent the blood from contacting the exhaust plug too early, ensure the amount of blood collected, and improve the accuracy of blood gas analysis; and a gap is provided between the air inlet end and the piston, which increases the length of the path of blood flowing to the air inlet end, delays the contact time between the blood and the exhaust plug, allows the gas to be discharged in time through the exhaust plug, prevents the gas from being integrated into the blood sample, and can further improve the accuracy of blood gas analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0008] Figure 1 It is a structural schematic diagram of an embodiment of a preset blood sample collector provided by the present application;

[0009] Figure 2 It is a schematic diagram of the exploded structure of an embodiment of a preset blood sample collector provided by the present application;

[0010] Figure 3 It is a schematic diagram of the cross-sectional structure of an embodiment of a preset blood sample collector provided by the present application along an axial viewing angle;

[0011] Figure 4 It is a schematic diagram of a partial cross-sectional structure of a first embodiment of a preset blood sample collector provided by the present application from an axial perspective;

[0012] Figure 5 It is a structural schematic diagram of an embodiment of a push rod provided by the present application;

[0013] Figure 6 It is a partial structural schematic diagram of an embodiment of a push rod provided by the present application;

[0014] Figure 7 It is a structural schematic diagram of an embodiment of a piston provided by the present application;

[0015] Figure 8 It is a schematic diagram of a partial cross-sectional structure of a second embodiment of the preset blood sample collector provided by the present application from an axial perspective;

[0016] Fig. 9 It is a schematic diagram of a partial cross-sectional structure of a third embodiment of the preset blood sample collector provided by the present application from an axial perspective;

[0017] Fig.10 It is a schematic diagram of a partial cross-sectional structure of a fourth embodiment of the preset blood sample collector provided by the present application, taken along an axial viewing angle;

[0018] Fig.11 It is a schematic diagram of the partial cross-sectional structure of the fifth embodiment of the preset blood sample collector provided by the present application along an axial viewing angle. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0020] In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited. The terms "first", "second", and "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", and "third" can expressly or implicitly include at least one of the features. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of the present application and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products, or devices.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] The present application provides a preset blood sample collector. According to the pharmaceutical industry standard of the People's Republic of China YY / T0612-2022, "Disposable Human Arterial Blood Sample Collector (Arterial Blood Gas Needle)", the definition of a preset blood sample collector is that before blood collection, the sample storage device piston is preset to the blood collection scale, and during the blood collection period, the blood sample automatically flows into the sample storage device based on the patient's arterial pressure. Its structural feature is that there is an exhaust device on the piston of the sample storage device that can block the liquid, through which the gas can be discharged during the blood collection period. Once the device is soaked with blood, it will also block the air. Please refer to Figure 1-Figure 7 The preset blood sample collector 100 is provided with a sample storage chamber 11 for storing blood samples. One end of the sample storage chamber 11 is a liquid inlet, and the blood sample can enter the sample storage chamber 11 from the liquid inlet. The preset blood sample collector 100 may include a sample storage housing 10, a push rod 20, a piston 30, and an exhaust plug 40. The sample storage housing 10 has an inner space, and the sample storage housing 10 forms part or all of the side walls of the sample storage chamber 11. The sample storage housing 10 may be made of a transparent material to facilitate observation of the collection progress of the blood sample in the sample storage chamber 11. The sample storage housing 10 may be provided with a scale to facilitate the preset blood collection amount. The push rod 20 has a first end 21 and a second end 22 that are arranged opposite to each other, the first end 21 is built into the sample storage housing 10, and the second end 22 is exposed outside the sample storage housing 10, and the piston 30 is installed at the first end 21 of the push rod 20. The piston 30 may be made of elastic materials such as silicone or rubber, and the outer wall of the piston 30 may be provided with convex ribs, so that the piston 30 and the sample storage housing 10 are interference-fitted to seal the sample storage cavity 11. Before blood collection, the push rod 20 is pulled, and the push rod 20 drives the piston 30 to move, thereby moving the piston 30 to a preset blood collection scale.

[0023] The push rod 20 is provided with an exhaust channel 24, and the exhaust channel 24 is used to discharge the gas in the sample storage chamber 11. The exhaust plug 40 is sealed between the exhaust channel 24 and the sample storage chamber 11. The exhaust plug 40 can be sintered from a breathable material (such as PE, Polyethylene, polyethylene resin). The exhaust plug 40 has a tiny hole structure inside, and the hole can pass through the gas when it is not in contact with the liquid; when the exhaust plug 40 is in contact with the liquid, the breathable material expands, so that the hole is closed and the gas is prevented from passing. During the blood collection process, the gas in the sample storage chamber 11 can be discharged through the hole of the exhaust plug 40; when the blood collection amount reaches a preset value, the blood contacts the exhaust plug 40 to close the hole, thereby sealing the blood in the sample storage chamber 11 so that the blood does not come into contact with the air.

[0024] One end of the exhaust plug 40 close to the liquid inlet of the sample storage housing 10 is configured as an air inlet end 41. The gas in the sample storage chamber 11 can enter the exhaust plug 40 through the air inlet end 41 to discharge the gas in the sample storage chamber 11. A portion of the piston 30 is shielded outside the air inlet end 41, which can prevent the blood entering the sample storage chamber 11 from contacting the exhaust plug 40 too early to seal it, thereby ensuring the blood collection amount and improving the accuracy of blood gas analysis.

[0025] A gap 33 is provided between the air inlet end 41 and the piston 30, and the air inlet end 41 is partially or completely exposed to the air. That is, at least some areas of the surface of the air inlet end 41 are not in contact with the piston 30, and the surfaces of these areas can be in contact with the air. The adjacent space of the air inlet end 41 is connected to the sample storage chamber 11, and the exhaust plug 40 and the exhaust channel 24 are configured as a discharge channel for the gas in the sample storage chamber 11. By providing a gap 33 between the air inlet end 41 and the piston 30, the length of the path of blood flowing to the air inlet end 41 is increased, and the contact time between the blood and the exhaust plug 40 is delayed, so that the gas can be discharged in time through the exhaust plug 40, preventing the gas from being integrated into the blood sample, and further improving the accuracy of blood gas analysis.

[0026] In one embodiment, if Figure 4-Figure 7As shown, a part of the piston 30 is sleeved outside the push rod 20, and the remaining part of the piston 30 has an inner space and is provided with an exhaust hole 32, and the exhaust plug 40 is installed at the first end 21 of the push rod 20. Optionally, the outer wall of the push rod 20 can be provided with a groove along the circumferential direction, and accordingly, a flange is provided on the inner wall of the piston 30 that matches the outer wall of the push rod 20, and the flange can be engaged in the groove, which can enhance the firmness of the connection between the piston 30 and the push rod 20 and prevent the piston 30 from falling off when the push rod 20 drives the piston 30 to move. The air inlet end 41 is accommodated in the inner space of the piston 30, and the piston 30 and the sample storage housing 10 are surrounded to form the sample storage chamber 11, so that the piston 30 can partially or completely cover the air inlet end 41, which can prevent the blood entering the sample storage chamber 11 from contacting the air inlet end 41 too early, thereby ensuring the blood collection amount and the accuracy of blood gas analysis. The gap 33 between the piston 30 and the air inlet end 41 and the adjacent space form an exhaust chamber 31, and the exhaust chamber 31 is connected to the sample storage chamber 11 through the exhaust hole 32. Since the gas in the sample storage chamber 11 is discharged through the exhaust plug 40, the exhaust rate of the gas is positively correlated to the contact area between the gas and the exhaust plug 40. That is, the larger the contact area between the gas and the exhaust plug 40, the more gas can be discharged at the same time, the greater the gas exhaust rate, and the stronger the exhaust capacity of the collector. An exhaust chamber 31 is arranged between the piston 30 and the air inlet end 41, and the gas in the sample storage chamber 11 can enter the exhaust chamber 31. The exhaust chamber 31 forms a temporary accommodation space for gas when it is discharged, and can temporarily confine the gas in a certain space, so that the gas is in full contact with the side wall thereof in the exhaust chamber 31, wherein the exhaust chamber 31 is formed by the gap 33 between the piston 30 and the air inlet end 41 and the adjacent space thereof, that is, the air inlet end 41 is a part of the side wall of the exhaust chamber 31, so the gas can be in full contact with the part of the surface of the air inlet end 41 exposed to the air, thereby increasing the contact area between the gas and the air inlet end 41, and improving the exhaust capacity of the collector.

[0027] In one embodiment, if Figure 4 As shown, a gap 33 is provided between the outer end surface 411 of the intake end 41 and the inner wall of the piston 30, and the outer end surface 411 of the intake end 41 is exposed to the exhaust cavity 31. In this way, the surface of the outer end surface 411 of the intake end 41 is completely exposed to the exhaust cavity 31, increasing the contact area between the gas and the intake end 41.

[0028] Alternatively, if Figure 4 As shown, the outer end surface 411 of the air inlet end 41 is flush with the outer end surface 211 of the first end 21 of the push rod 20, and the inner wall of the piston 30, the outer end surface 411 of the air inlet end 41 and the outer end surface 211 of the first end 21 are surrounded to form the exhaust cavity 31. When assembling the exhaust plug 40, since the outer end surface 411 of the air inlet end 41 is flush with the outer end surface 211 of the first end 21, the outer end surface 211 of the first end 21 can be used as a reference surface, thereby facilitating the installation and alignment of the exhaust plug 40 and improving the assembly accuracy of the exhaust plug 40.

[0029] Alternatively, if Figure 8 As shown, the inlet end 41 is recessed in the first end 21 of the push rod 20, and the outer end surface 411 of the inlet end 41 is exposed to the exhaust chamber 31. The piston 30 is made of a flexible material and has a certain compressibility. When the piston 30 is assembled, the piston 30 is compressed and deformed, which may cause the inner wall of the piston 30 to abut against the outer end surface 411 of the inlet end 41, compressing the space of the exhaust chamber 31, reducing the contact area between the gas and the inlet end 41, and affecting the exhaust capacity of the collector. The inlet end 41 is recessed in the first end 21 of the push rod 20, so that the outer end surface 211 of the first end 21 protrudes from the outer end surface 411 of the inlet end 41. The outer end surface 211 of the first end 21 can limit the deformation of the inner wall of the piston 30, prevent the inner wall of the piston 30 from abutting against the outer end surface 411 of the inlet end 41, thereby ensuring that the outer end surface 411 of the inlet end 41 is exposed to the exhaust chamber 31.

[0030] In one embodiment, if Fig. 9 As shown, the air inlet end 41 is partially exposed at the first end 21 of the push rod 20, and the outer end surface 411 of the air inlet end 41 and the side wall 412 adjacent to the outer end surface 411 are exposed to the exhaust cavity 31. In this arrangement, in addition to the outer end surface 411 of the air inlet end 41 being exposed to the exhaust cavity 31, a part of the side wall 412 adjacent to the outer end surface 411 can also be exposed to the exhaust cavity 31, further increasing the contact area between the gas and the air inlet end 41, and improving the exhaust capacity of the collector.

[0031] The opening position and opening number of the exhaust holes 32 can be set in a variety of ways. Figure 7In one embodiment, the exhaust hole 32 is provided at one end of the piston 30 close to the sample storage chamber 11, so that the gas in the sample storage chamber 11 can enter the exhaust chamber 31 from the top wall of the inner space of the piston 30 close to one end of the sample storage chamber 11. Compared with the exhaust hole provided on the side wall of the inner space of the piston 30 in the related art, the flow path of the gas in the sample storage chamber 11 entering the exhaust chamber 31 is shorter, the fluid resistance is small, and the gas flow is smoother, so that the gas can be discharged faster, thereby improving the exhaust capacity of the collector. Furthermore, the number of exhaust holes 32 is multiple, and the multiple exhaust holes 32 are arranged in a ring along the outer periphery of the end of the piston 30. Optionally, the number of exhaust holes 32 can be 2, 3 or 4, etc., which is not specifically limited here. Under the condition of the same total opening area, multiple exhaust holes 32 are dispersedly arranged on the periphery of the end of the piston 30. Compared with one exhaust hole set in the middle of the end of the piston 30, the opening area of ​​a single hole is smaller when dispersedly arranged, so that the probability of blood coming into contact with the exhaust plug 40 too early through the exhaust holes 32 is reduced, and the blood in the sample storage chamber 11 can be prevented from coming into contact with the exhaust plug 40 too early; and even if the holes of the exhaust plug 40 at the corresponding positions of some exhaust holes are closed due to contact with blood, there are still holes of the exhaust plug 40 at the corresponding positions of other exhaust holes that can be exhausted, thereby ensuring the reliability of exhaust.

[0032] Optionally, the opening shape of the exhaust hole 32 is circular, oval, square or triangular, so that the opening shape of the exhaust hole 32 is relatively regular, which can facilitate the processing of the piston 30. Further, the opening shape and opening area of ​​the plurality of exhaust holes 32 can be the same, so as to further simplify the preparation process of the piston 30.

[0033] Alternatively, if Figure 4 As shown, the size of the end of the vent 32 near the liquid inlet of the sample storage housing 10 is smaller than the size of the end of the vent 32 near the vent plug 40. For example, the opening of the vent 32 is stepped, wherein the size of the end of the vent 32 near the liquid inlet of the sample storage housing 10 is relatively small, so that the probability of blood coming into contact with the vent plug 40 too early through the vent 32 is reduced, and the blood in the sample storage cavity 11 can be prevented from coming into contact with the vent plug 40 too early; the size of the end of the vent 32 near the vent plug 40 is relatively large, which can increase the volume of the vent cavity 31, increase the contact area between the gas and the gas inlet end 41, and improve the exhaust capacity of the collector.

[0034] See also Figure 4In one embodiment, the exhaust plug 40 is a porous medium, and a mounting hole 23 is formed at the first end 21, the mounting hole 23 is connected to the exhaust channel 24, and the exhaust plug 40 is assembled in the mounting hole 23 by interference fit, so that the hole wall of the mounting hole 23 can squeeze the exhaust plug 40 to adjust the size of the exhaust pore in the exhaust plug 40. The exhaust capacity of the exhaust plug 40 is related to the size of the exhaust pore in the exhaust plug 40. By setting the exhaust plug 40 to be assembled in the mounting hole 23 by interference fit, the size of the exhaust pore in the exhaust plug 40 can be adjusted, thereby adjusting the exhaust capacity of the exhaust plug 40 to meet various needs of users.

[0035] Optionally, the exhaust plug 40 is in the shape of a cylinder with a uniform cross section, and the cross-sectional shape of the exhaust plug 40 may be circular, elliptical, square or triangular. The above-mentioned shape is relatively regular, which can simplify the processing technology of the exhaust plug 40. The opening shape of the mounting hole 23 can be adapted to the outer contour of the exhaust plug 40. For example, the cross-sectional shape of the portion of the exhaust plug 40 adjacent to the exhaust channel 24 is circular or elliptical, and accordingly, the opening shape of the mounting hole 23 is also circular or elliptical.

[0036] The exhaust plug 40 has an exhaust end 42 arranged opposite to the air inlet end 41, and the exhaust end 42 is assembled in the mounting hole 23. The exhaust end 42 is arranged at one end of the exhaust plug 40 connected to the exhaust channel 24. When the blood collection volume reaches a preset value, the blood enters the exhaust chamber 31 and contacts the air inlet end 41 first, and the exhaust pores in the air inlet end 41 are closed, thereby sealing the blood in the sample storage chamber 11. If some of the exhaust pores in the air inlet end 41 are not completely closed, the blood will continue to flow to the exhaust end 42, which may affect the reliability of the airtightness of the sample storage chamber 11. In order to improve the reliability of the airtightness of the sample storage chamber 11, in one embodiment, optionally, one end of the mounting hole 23 connected to the exhaust channel 24 is interference-fitted with the exhaust plug 40, and one end of the mounting hole 23 close to the liquid inlet of the sample storage shell 10 is gap-fitted with the exhaust plug 40. When the exhaust plug 40 is assembled into the mounting hole 23, since one end of the mounting hole 23 connected to the exhaust channel 24 is in interference fit with the exhaust plug 40, the hole wall of the mounting hole 23 can squeeze the exhaust end 42, so that the exhaust pores in the exhaust end 42 are squeezed and reduced, or part of the exhaust pores are closed. That is, the size of the exhaust pores in the exhaust end 42 is smaller than the size of the exhaust pores in the air inlet end 41, or the number of the exhaust pores in the exhaust end 42 is less than the number of the exhaust pores in the air inlet end 41, so that the exhaust pores in the exhaust end 42 are easier to close. Even if blood flows to the exhaust end 42, the exhaust pores in the exhaust end 42 can be closed after contacting the blood to prevent the blood from contacting the air, thereby improving the reliability of the airtightness of the sample storage chamber 11.

[0037] Optionally, in one embodiment, the interference between one end of the mounting hole 23 connected to the exhaust channel 24 and the exhaust plug 40 is greater than the interference between one end of the mounting hole 23 close to the liquid inlet of the sample storage housing 10 and the exhaust plug 40. When the exhaust plug 40 is assembled into the mounting hole 23, due to the difference in interference fit, the end of the exhaust plug 40 connected to the exhaust channel 24 is subjected to a greater squeezing pressure from the hole wall of the mounting hole 23 than the end of the exhaust plug 40 close to the liquid inlet of the sample storage shell 10, that is, the squeezing pressure from the hole wall of the mounting hole 23 on the exhaust end 42 is greater than the squeezing pressure from the hole wall of the mounting hole 23 on the air inlet end 41, the size of the exhaust pores in the exhaust end 42 is smaller than the size of the exhaust pores in the air inlet end 41, or the number of exhaust pores in the exhaust end 42 is less than the number of exhaust pores in the air inlet end 41, which also makes the exhaust pores in the exhaust end 42 easier to close. Even if blood flows to the exhaust end 42, the exhaust pores in the exhaust end 42 can be closed after contacting the blood, thereby improving the reliability of the airtightness of the sample storage chamber 11.

[0038] Optionally, the size of the end of the mounting hole 23 near the liquid inlet of the sample storage housing 10 is larger than the size of the end of the mounting hole 23 connected to the exhaust channel 24. For example, the opening of the mounting hole 23 may be stepped, wherein the size of the end near the liquid inlet of the sample storage housing 10 is relatively large, and the size of the end connected to the exhaust channel 24 is relatively small. Or, Fig.10 As shown, the portion of the exhaust plug 40 adjacent to the exhaust channel 24 is cone-shaped, and the portion of the mounting hole 23 adjacent to the exhaust channel 24 is also cone-shaped, and the shape is adapted to the outer contour of the exhaust plug 40. The cross-sectional area of ​​the portion of the mounting hole 23 adjacent to the exhaust channel 24 gradually decreases from the end close to the liquid inlet of the sample storage housing 10 to the end away from the liquid inlet of the sample storage housing 10, forming a cone shape, and the length of the exhaust plug 40 assembled in the mounting hole 23 is adjustable. In this way, by adjusting the length of the exhaust plug 40 assembled in the mounting hole 23, the tightness of the exhaust plug 40 assembled in the mounting hole 23 by interference fit can be adjusted, thereby adjusting the size of the exhaust pore in the exhaust plug 40, which is convenient for adjusting the exhaust capacity of the exhaust plug 40 and improving the reliability of the airtightness of the sample storage chamber 11.

[0039] In one embodiment, if Fig.11As shown, the portion of the exhaust plug 40 away from the exhaust channel 24 is exposed to the mounting hole 23, and the cross-sectional area of ​​the portion of the exhaust plug 40 located outside the mounting hole 23 is larger than the cross-sectional area of ​​the portion of the exhaust plug 40 located inside the mounting hole 23. Specifically, the exhaust plug 40 can be arranged in two sections with variable cross-sections in the axial direction, wherein the cross-sectional area of ​​the section exposed to the mounting hole 23 is larger, and the cross-sectional area of ​​the section located inside the mounting hole 23 is smaller, thereby forming a step at the connection between the two sections. On the one hand, the step can be used for assembly positioning, thereby facilitating the installation and alignment of the exhaust plug 40; on the other hand, the cross-sectional area of ​​the exhaust plug 40 located outside the mounting hole 23 is larger, which can increase the contact area between the gas and the exhaust plug 40, thereby improving the exhaust capacity of the collector.

[0040] The exhaust passage 24 may extend along the axial direction of the push rod 20 to the second end 22 and penetrate the outer wall of the second end 22 so that the gas can be exhausted from the second end 22. Figure 4-Figure 6 In one embodiment, the first end 21 of the push rod 20 is provided with a mounting hole 23 and an exhaust channel 24, the mounting hole 23 is connected to the exhaust channel 24, and the end of the exhaust channel 24 away from the mounting hole 23 penetrates the outer wall of the first end 21, so that the gas can be discharged from the first end 21. For example, there is a gap between the outer wall of the push rod 20 and the sample storage housing 10, and the gas discharged from the first end 21 can be discharged out of the blood collector through the gap; or the push rod 20 is provided with an exhaust groove 25 extending along the axial direction of the push rod 20, the exhaust groove 25 is connected to the exhaust channel 24, and the gas discharged from the first end 21 can be discharged out of the collector through the exhaust groove 25. The number of exhaust grooves 25 can be one or more, such as 2, 3 or 4. The exhaust groove 25 can extend to the second end 22, that is, the exhaust groove 25 is arranged along the axial length of the push rod 20. The end of the exhaust channel 24 away from the mounting hole 23 is arranged to penetrate the outer wall of the first end 21, so that the length of the exhaust channel 24 is relatively short, which can increase the gas discharge rate, thereby improving the exhaust capacity of the collector.

[0041] The present application provides a push rod. Figure 5 , Figure 6The push rod 20 is applied to the preset blood sample collector 100. The push rod 20 has a first end 21 and a second end 22 that are arranged opposite to each other, and the piston 30 is installed at the first end 21 of the push rod 20. The push rod 20 is provided with an exhaust channel 24, and the exhaust plug 40 is blocked in the exhaust channel 24. For example, the exhaust plug 40 can be installed at the first end 21. The part of the exhaust plug 40 close to the first end 21 is configured as an air inlet end 41, a part of the piston 30 is blocked outside the air inlet end 41, a gap 33 is provided between the air inlet end 41 and the piston 30, and the air inlet end 41 is partially or completely exposed to the air, and the exhaust plug 40 and the exhaust channel 24 are configured as an exhaust channel for the gas in the sample storage chamber 11. The interference between the exhaust plug 40 and the component for installing the exhaust plug 40 will affect the exhaust capacity of the collector. If the component for installing the exhaust plug 40 is deformed, it may be difficult to position the exhaust plug 40 during installation, the installation position of the exhaust plug 40 is not accurate enough, the installation accuracy is low, and the different interference amounts lead to inconsistent exhaust capacity of the collector. The push rod 20 and the exhaust plug 40 provided in the present application are sealed in the exhaust channel 24. Generally speaking, the hardness of the push rod 20 is relatively large, for example, greater than the hardness of the piston 30. The exhaust plug 40 is installed on the push rod 20, so that the parts used to install the exhaust plug 40 are not easily deformed, which can improve the installation accuracy of the exhaust plug 40 and ensure that the interference fit between the exhaust plug 40 and the push rod 20 is relatively stable during assembly of the product, thereby ensuring the consistency of the exhaust capacity of the collector.

[0042] The above descriptions are only some embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A preset blood sample collector, characterized in that: The preset blood sample collector is provided with a sample storage cavity for storing blood samples, and the preset blood sample collector comprises: A sample storage housing, a push rod, a piston and an exhaust plug, wherein the sample storage housing forms part or all of the side wall of the sample storage chamber, the push rod has a first end and a second end that are oppositely arranged, the first end is built into the sample storage housing, and the second end is exposed outside the sample storage housing, and the piston is installed at the first end of the push rod; The push rod is provided with an exhaust channel, and the exhaust plug is sealed between the exhaust channel and the sample storage chamber. The end of the exhaust plug close to the liquid inlet of the sample storage shell is configured as an air inlet end, a part of the piston is blocked outside the air inlet end, a gap is provided between the air inlet end and the piston, the air inlet end is partially or completely exposed to the air, the adjacent space of the air inlet end is connected to the sample storage chamber, and the exhaust plug and the exhaust channel are configured as exhaust channels for the gas in the sample storage chamber.

2. The preset blood sample collector according to claim 1, characterized in that: A portion of the piston is sleeved outside the push rod, and the remaining portion of the piston has an inner space and is provided with an exhaust hole. The exhaust plug is installed at the first end of the push rod, and the air inlet end is accommodated in the inner space of the piston. The piston and the sample storage shell are surrounded to form the sample storage cavity, and the gap between the piston and the air inlet end and the adjacent space form an exhaust cavity, and the exhaust cavity is connected to the sample storage cavity through the exhaust hole.

3. The preset blood sample collector according to claim 2, characterized in that: The gap is provided between the outer end surface of the air inlet end and the inner wall of the piston, and the outer end surface of the air inlet end is exposed to the exhaust chamber.

4. The preset blood sample collector according to claim 2, characterized in that: The outer end surface of the air inlet end is flush with the outer end surface of the first end of the push rod, and the inner wall of the piston, the outer end surface of the air inlet end and the outer end surface of the first end are surrounded to form the exhaust chamber.

5. The preset blood sample collector according to claim 2, characterized in that: The air inlet end is partially exposed at the first end of the push rod, and the outer end surface of the air inlet end and the side wall adjacent to the outer end surface are exposed to the exhaust cavity.

6. The preset blood sample collector according to claim 2, characterized in that: The air inlet end is recessed inside the first end of the push rod, and the outer end surface of the air inlet end is exposed to the exhaust cavity.

7. The preset blood sample collector according to any one of claims 2 to 6, characterized in that: The exhaust hole is opened at one end of the piston close to the sample storage chamber. There are multiple exhaust holes, which are arranged in a ring shape along the outer circumference of the end of the piston.

8. The preset blood sample collector according to claim 7, characterized in that: The size of one end of the vent hole close to the liquid inlet of the sample storage housing is smaller than the size of one end of the vent hole close to the vent plug.

9. The preset blood sample collector according to any one of claims 1 to 6, characterized in that: The exhaust plug is a porous medium, the first end is provided with a mounting hole, the mounting hole is connected to the exhaust channel, and the exhaust plug is assembled in the mounting hole by interference fit.

10. The preset blood sample collector according to claim 9, characterized in that: One end of the mounting hole connected to the exhaust channel has an interference fit with the exhaust plug, and one end of the mounting hole close to the liquid inlet of the sample storage shell has a clearance fit with the exhaust plug; or The interference between one end of the mounting hole connected to the exhaust channel and the exhaust plug is greater than the interference between one end of the mounting hole close to the liquid inlet of the sample storage shell and the exhaust plug.

11. The preset blood sample collector according to claim 1, characterized in that: A mounting hole and the exhaust channel are formed at the first end of the push rod. The mounting hole is connected to the exhaust channel. An end of the exhaust channel away from the mounting hole penetrates through the outer wall of the first end.

12. A push rod, characterized in that: The push rod is applied to a preset blood sample collector, the push rod has a first end and a second end that are arranged opposite to each other, and the piston is installed at the first end of the push rod; The push rod is provided with an exhaust channel, and the exhaust plug is sealed in the exhaust channel. The part of the exhaust plug close to the first end is configured as an inlet end, a part of the piston is blocked outside the inlet end, and a gap is provided between the inlet end and the piston. The inlet end is partially or completely exposed to the air, and the exhaust plug and the exhaust channel are configured as an exhaust channel for the gas in the sample storage chamber.

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