Micro blood gas blood collector

Abstract

This application relates to the field of medical devices, specifically disclosing a micro-volume blood gas collector, which includes a housing and an end cap connected to one end of the housing. A vent hole is provided on the side wall of the housing away from the end cap. A Luer head is connected to the end of the end cap away from the vent hole. An exhaust hole is provided on the end cap, and a sealing plug adapted to fit the exhaust hole is inserted into the end cap. A concave capillary is provided inside the housing, with right-angle bends. The concave capillary includes a short tube, a long tube, and a bottom tube. A shaking column is placed inside both the short and long tubes. A sealing block is connected to one end of the short tube, and the end of the sealing block away from the short tube is connected to the exhaust hole. One end of the long tube is connected to the Luer head, and the other ends of the long and short tubes are connected to both ends of the bottom tube. The diameter of the shaking column is smaller than the inner diameter of the concave capillary. This application has the effect of making the anticoagulant and blood in the micro-volume blood gas collector mix more evenly.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a micro-blood gas collection device. Background Technology

[0002] Blood gas analysis uses a blood gas analyzer to measure a series of indicators in the blood, such as partial pressure of oxygen (PO2), partial pressure of carbon dioxide (PCO2), blood pH, electrolytes, and metabolites, to evaluate a patient's oxygenation, ventilation function, and acid-base status. It plays an important role in the diagnosis and treatment of respiratory failure, the rescue and monitoring of critically ill patients.

[0003] Blood gas collection devices are commonly used when performing blood gas analysis on patients. A Chinese patent document with publication number CN221997843U discloses an integrated U-shaped capillary micro-blood gas collection device, which includes a housing and a capillary tube disposed within the housing. The housing has a blood collection port and an exhaust port. The capillary tube is an integrated U-shaped PET capillary tube. The housing has a needle seat at the blood collection port, which is adapted to a Luer head. The housing also has a protective sleeve, which is disposed on one side of the needle seat. The protective sleeve is used for medical personnel to hold and collect blood.

[0004] After blood is collected using the aforementioned micro-blood gas collection device, the capillary diameter is small, and the blood cannot mix fully with the anticoagulant on the inner wall of the capillary, which can lead to the formation of tiny thrombi and result in low accuracy of blood gas analysis results. Utility Model Content

[0005] To address the problem of insufficient mixing of anticoagulant and blood in micro-blood gas collection devices, this application provides a micro-blood gas collection device.

[0006] The micro-volume blood gas collection device provided in this application adopts the following technical solution:

[0007] A micro-volume blood gas collection device includes a housing and an end cap connected to one end of the housing. The device is characterized by: a vent hole on the side wall of the housing away from the end cap; a Luer head connected to the end cap away from the vent hole; an exhaust hole on the end cap; a sealing plug adapted to the exhaust hole inserted into the end cap; a concave capillary tube inside the housing with a right-angle bend; the concave capillary tube includes a short tube, a long tube, and a bottom tube; a shaking column is placed inside both the short tube and the long tube; a sealing block is connected to one end of the short tube; the sealing block, away from the short tube, is connected to the exhaust hole; one end of the long tube is connected to the Luer head; the other ends of the long tube and the other ends of the short tube are connected to both ends of the bottom tube; and the diameter of the shaking column is smaller than the inner diameter of the concave capillary tube.

[0008] By adopting the above technical solution, during blood collection, the Luer head is connected to the needle, and the blood enters the concave capillary from the Luer head. After blood collection, the micro-volume blood gas collector is shaken. The diameter of the shaking column is smaller than the inner diameter of the concave capillary, allowing the shaking column to move back and forth inside the long and short tubes. The bends in the concave capillary are at right angles, and the two shaking columns can move freely inside the short and long tubes respectively. During blood gas analysis, the sealing plug is opened, and the blood gas analyzer can enter the concave capillary through the vent. The shaking column ensures that the blood is fully mixed with the anticoagulant inside the concave capillary, preventing blood agglomeration and improving the accuracy of blood gas analysis results.

[0009] Optionally, the shaking column is a hollow tubular structure.

[0010] By adopting the above technical solution, during blood collection, blood can flow through the shaking column. The diameter of the shaking column is smaller than the inner diameter of the concave capillary, allowing the shaking column to move freely within the concave capillary. Blood can also flow through the gap between the outer wall of the shaking column and the inner wall of the concave capillary, reducing the impact on the blood collection speed. The shaking column structure is also lighter, preventing the shaking column from colliding with the concave capillary when the micro-blood gas collector is shaken violently.

[0011] Optionally, a blood drainage groove is provided at one end of the shaking column near the bottom tube.

[0012] By adopting the above technical solution, when the shaking column is located inside the concave capillary, the blood drainage groove is connected to the bottom tube. During blood collection, blood can flow through the blood drainage groove, avoiding the shaking column from blocking blood flow during blood collection.

[0013] Optionally, the sealing block has a first connecting hole, a second connecting hole, and a third connecting hole. The first connecting hole is connected to one end of the short pipe, the second connecting hole is connected to the vent hole, and a hemostatic element is fixedly connected in the third connecting hole. The hemostatic element has a porous structure and is connected to the outside air. When the hemostatic element comes into contact with blood, it expands and seals the third connecting hole.

[0014] By adopting the above technical solution, during blood collection, the blood enters the third connecting hole through the first connecting hole. The blood comes into contact with the hemostatic element in the third connecting hole, which expands and seals the third connecting hole, forming a closed space in the concave capillary, thus stopping the blood from flowing into the concave capillary. During blood gas analysis, the sealing plug is opened, and the vent is connected to the second connecting hole. The blood gas analyzer enters the second connecting hole through the vent and draws blood for analysis.

[0015] Optionally, the sealing block has a variable diameter hole, one end of which is connected to the end of the first connecting hole away from the concave capillary, and the other end of which is connected to the second connecting hole. The diameter of the variable diameter hole is smaller than the diameter of the shaking column.

[0016] By adopting the above technical solution, when the shaking column moves in the concave capillary, the variable diameter hole connected to the first connecting hole will block the shaking column from entering, preventing the shaking column from contacting the sealing plug through the first and second connecting holes, avoiding the shaking column from hitting the sealing plug when shaking, and ensuring that the blood in the concave capillary does not come into contact with air.

[0017] Optionally, a rubber tube is fixed to one end of the long tube near the Luer head, the inner diameter of the rubber tube at the end away from the concave capillary is smaller than the outer diameter of the shaking column, and the outer wall of the rubber tube is in contact with the inner wall of the Luer head.

[0018] By adopting the above technical solution, when the micro-volume blood gas collection device is shaken, the shaking column moves inside the concave capillary tube. The rubber tube prevents the shaking column from sliding out of the concave capillary tube, thus preventing the shaking column from entering the Luer head and from hitting the needle connected to the Luer head.

[0019] Optionally, a cross-shaped limiting block is fixedly connected to the inside of the housing at one end away from the end cap, and the limiting block abuts against the concave capillary.

[0020] By adopting the above technical solution, when the micro-volume blood gas collector is shaken, the bottom of the concave capillary is pressed against the cross-shaped limiting block, which avoids loosening of the Luer head, the first connecting hole and the concave capillary connection, and prevents air from entering the concave capillary.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. When the micro-volume blood gas collector is shaken, the shaking column moves within the concave capillary, ensuring thorough mixing of the blood with the anticoagulant inside the capillary and preventing blood agglomeration. The shaking column also ensures thorough mixing of any stratified blood, guaranteeing the accuracy of the blood gas analysis results. When collecting blood with the micro-volume blood gas collector, the blood can flow through the hollow part of the shaking column or through the gap formed between the shaking column and the inner wall of the concave capillary. When the shaking column is at the bottom of the concave capillary, the blood can flow through the discharge groove. The shaking column also minimizes its impact on the blood collection speed.

[0023] 2. When the micro-volume blood gas collector is shaken, the shaking column moves along the inside of the concave capillary tube. The reducing orifice prevents the shaking column from entering the second connecting hole, thus preventing the shaking column from impacting the sealing plug. The rubber tube prevents the shaking column from entering the Luer head, thus preventing the shaking column from impacting the needle connected to the Luer head. This avoids loosening of the sealing plug and needle due to the impact of the shaking column, ensuring the sealing performance of the micro-volume blood gas collector and guaranteeing the accuracy of the blood gas analysis results.

[0024] 3. When the micro-volume blood gas collector is shaken, the limiting block presses against the bottom of the concave capillary, preventing the concave capillary from shaking inside the shell. This avoids loosening at the connection points of the first connecting hole, Luer head, and both ends of the concave capillary, ensuring the sealing of the micro-volume blood gas collector and guaranteeing the accuracy of the blood gas analysis results. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0026] Figure 2 It is along Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0027] Figure 3 This is a top-view enlarged schematic diagram of the barrier strip used in Embodiment 2;

[0028] Figure 4 This is a schematic diagram used in Embodiment 3 to demonstrate the annular barrier sheet.

[0029] Reference numerals: 1. Shell; 21. Vent hole; 22. Luer head; 23. Sealing plug; 3. Vent hole; 4. Shaking column; 5. Concave capillary tube; 51. Short tube; 52. Long tube; 53. Bottom tube; 61. First connecting hole; 62. Second connecting hole; 63. Third connecting hole; 64. Variable diameter hole; 65. Hemostatic element; 7. Drainage groove; 81. Rubber tube; 82. Barrier strip; 83. Circular barrier plate; 9. Limiting block. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0031] This application discloses a micro-volume blood gas collection device. (Refer to...) Figure 1 and Figure 2The micro-blood gas collection device includes a housing 1 and an end cap fixed to one end of the housing 1. A vent 3 is provided at the end of the housing 1 away from the end cap. A Luer head 22 is connected to the end of the end cap away from the vent 3. The Luer head 22 has a conical cylindrical internal shape. An exhaust port 21 is provided at the end of the end cap away from the vent 3. A sealing plug 23 adapted to the exhaust port 21 is inserted into the end cap. A concave capillary tube 5 is provided inside the housing 1. The bend of the concave capillary tube 5 is at a right angle. The concave capillary tube 5 includes a long tube 52, a short tube 51, and a bottom tube 53. A shaking column 4 is placed inside both the long tube 52 and the short tube 51. The diameter of the shaking column 4 is smaller than the inner diameter of the concave capillary tube 5. One end of the long tube 52 is connected to the inner wall of the Luer head 22. The short tube 51 is connected to the sealing block at one end, and the other ends of the long tube 52 and the short tube 51 are connected to the two ends of the bottom tube 53 respectively. The end cap is provided with a sealing block, which has a first connecting hole 61, a second connecting hole 62 and a third connecting hole 63. The first connecting hole 61 is connected to one end of the short tube 51, the second connecting hole 62 is connected to the vent hole 21, and the third connecting hole 63 passes through the sealing block. A hemostatic element 65 is bonded inside the third connecting hole 63. When the hemostatic element 65 is not in contact with blood, it can allow air to circulate. The air inside the shell 1 is connected to the outside air through the vent hole 3. When the hemostatic element 65 comes into contact with blood, it blocks the third connecting hole 63.

[0032] When the micro-volume blood gas collector collects blood, the Luer head 22 connects to the needle, and the blood enters the concave capillary 5 through the blood collection hole. The blood flows from one end of the short tube 51 into the channel formed by the sealing block. The blood comes into contact with the hemostatic element 65 through the third connecting hole 63. The hemostatic element 65 expands upon contact with the blood and seals the third connecting hole 63. The inside of the concave capillary 5 is isolated from the outside air, and the blood stops entering the concave capillary 5, thus completing the blood collection. After the blood collection is completed, the micro-volume blood gas collector is shaken, and the shaking column 4 moves within the concave capillary 5 to ensure that the blood is fully mixed with the anticoagulant adhering to the inner wall of the concave capillary 5.

[0033] Because red blood cells and white blood cells in the blood are prone to stratification due to their different densities during placement of the micro-blood gas collection device, and because blood sampling is performed by the sampling probe of a blood gas analyzer, if the blood stratification occurs, the uneven sample taken by the sampling probe during sampling will affect the subsequent interpretation of the results. Therefore, medical staff generally need to mix the blood sample in the micro-blood gas collection device before testing. Due to the small blood volume collected by the micro-blood collection device, it is not possible to mix it by conventional shaking methods. Usually, only a vibratory device can be used for mixing, which is relatively cumbersome. Moreover, each mixing is a batch operation, and there is still a settling time between mixing and sampling. The samples taken later are still prone to erythrocyte sedimentation rate (ESR). Therefore, improvements are needed. This application addresses this issue by using a sliding mechanism. The set-up mixing column allows medical staff to shake the micro-blood gas collector before testing, causing the mixing column 4 to move within the capillary to mix the blood sample. Before blood gas analysis, shaking the micro-blood gas collector again moves the mixing column 4 inside the concave capillary 5, thoroughly mixing the stratified blood. When using the blood gas analyzer, the sealing plug 23 on the vent 21 is opened, and the sampling probe of the blood gas analyzer is inserted into the second connection hole 62 through the vent 21, drawing the blood into the blood gas analyzer to complete the blood gas analysis. The concave capillary 5 has a right angle bend, which is less likely to get stuck at the bend of a U-shaped capillary compared to a U-shaped capillary. The mixing column 4 can move freely within the concave capillary 5. The concave capillary 5 is integrally molded, making it less expensive and easier to manufacture than a U-shaped capillary.

[0034] Reference Figure 2 The shaking column 4 is a hollow tubular structure with a blood drainage groove 7. The outer diameter of the shaking column 4 is smaller than the inner diameter of the concave capillary tube 5. The material of the shaking column 4 is stainless steel.

[0035] When blood flows in the concave capillary 5, it can flow through the gap between the shaking column 4 and the inner wall of the concave capillary 5, or it can flow through the hollow part of the shaking column 4. When the shaking column 4 is located at the bottom of the concave capillary 5, the blood can flow through the blood drainage groove 7, preventing the side wall of the shaking column 4 from blocking the bottom tube 53 and preventing the shaking column 4 from obstructing the blood flow. The shaking column 4 is made of stainless steel, which is cheaper and has a certain weight, so the shaking column 4 moves more smoothly in the concave capillary 5 when the micro-volume blood gas collection device filled with blood is shaken.

[0036] Reference Figure 2The sealing block has a variable diameter hole 64. One end of the variable diameter hole 64 is connected to the first connecting hole 61, and the other end of the variable diameter hole 64 is connected to the second connecting hole 62. The diameter of the variable diameter hole 64 is smaller than the outer diameter of the shaking column 4. A rubber tube 81 is provided inside the Luer head 22. The diameter of the end of the rubber tube 81 away from the long tube 52 is smaller than the outer diameter of the shaking column 4. The end of the rubber tube 81 away from the concave capillary tube 5 is pressed against the inner wall of the Luer head 22.

[0037] When the micro-volume blood gas collection device is shaken, the shaking column 4 inside the short tube 51 collides with the wall of the reducing hole 64. The reducing hole 64 prevents the shaking column 4 from entering the second connecting hole 62 through the first connecting hole 61, thus preventing the shaking column 4 from colliding with the sealing plug 23. The shaking column 4 inside the long tube 52 collides with the rubber tube 81. The rubber tube 81 prevents the shaking column 4 from entering the Luer head 22 and prevents the shaking column 4 from colliding with the needle connected to the Luer head 22.

[0038] Reference Figure 2 A limiting block 9 is fixedly attached to the inside of the housing 1 at the end furthest from the end cap. The limiting block 9 is bonded to the housing 1 or integrally formed with the housing 1. The limiting block 9 has a gradually decreasing thickness from the periphery to the center and can be cross-shaped. The limiting block 9 abuts against the bottom of the concave capillary 5. When the micro-volume blood gas collector is shaken, the limiting block 9 presses against the concave capillary 5, preventing the concave capillary 5 from shaking and avoiding loosening at the connection between the two ends of the concave capillary 5, thus ensuring the sealing of the micro-volume blood gas collector.

[0039] The implementation principle of a micro-volume blood gas collector according to an embodiment of this application is as follows: When the micro-volume blood gas collector collects blood, the Luer head 22 is connected to the needle, and the blood enters the concave capillary 5 through the Luer head 22. The bend of the concave capillary is at a right angle. The shaking column 4 is placed in the long tube 52 and the short tube 51 of the concave capillary 5, respectively. The diameter of the shaking column 4 is smaller than the inner diameter of the concave capillary 5, and the shaking column 4 can move freely inside the concave capillary 5. The blood flows from the hollow part of the shaking column 4 and the gap formed between the shaking column 4 and the inner wall of the concave capillary 5, and the blood flows out from the end of the short tube 51 connected to the first connecting hole 61. The blood flows into the third connecting hole 63 through the reducing hole 64. The hemostatic element 65, which is adhered to the third connecting hole 63, comes into contact with the blood and seals the third connecting hole 63, thus completing the blood collection. When the micro-volume blood gas collector is shaken, the shaking column 4 moves inside the concave capillary tube 5. The reducing hole 64 prevents the shaking column 4 inside the short tube 51 from hitting the sealing plug 23, and the rubber tube 81 prevents the shaking column 4 inside the long tube 52 from hitting the needle connected to the Luer head 22. This micro-volume blood gas collector can fully mix the blood with the anticoagulant and mix the stratified blood evenly, ensuring the accuracy of the blood gas analysis results.

[0040] Example 2

[0041] Reference Figure 3 The difference between this embodiment and embodiment one is that the rubber tube 81 is a barrier strip 82 that is bonded or integrally formed inside the Luer head 22. The barrier strip 82 can be a straight barrier strip 82 or a cross-shaped barrier strip 82.

[0042] When the micro-volume blood gas collection device is shaken, the concave capillary 5 is pressed against the inner wall of the Luer head 22, and the barrier strip 82 is attached to the end of the concave capillary 5, or the barrier strip 82 is separated from the end of the concave capillary 5. The separation gap is small, which prevents the shaking column 4 from entering the Luer head 22.

[0043] The implementation principle of a micro-volume blood gas collection device in this application embodiment is as follows: When the micro-volume blood gas collection device is shaken, the shaking column 4 moves inside the concave capillary tube 5. The barrier strip 82 inside the Luer head 22 prevents the shaking column 4 from contacting the needle tube connected to the Luer head 22, thus preventing the shaking column 4 from hitting the needle and causing loosening, and avoiding damage to the needle due to the impact of the shaking column 4.

[0044] Example 3

[0045] Reference Figure 4 The difference between this embodiment and Embodiment 1 is that the rubber tube 81 is an annular barrier 83 integrally formed or bonded to the inner wall of the Luer head 22, and the inner diameter of the barrier is smaller than the outer diameter of the shaking column 4.

[0046] When the micro-volume blood gas collection device is shaken, the concave capillary 5 is pressed against the inner wall of the Luer head 22, and the barrier plate is attached to the end of the concave capillary 5, or the barrier plate is separated from the end of the concave capillary 5. The separation gap is small, which prevents the shaking column 4 from entering the Luer head 22.

[0047] The implementation principle of a micro-volume blood gas collection device in this application embodiment is as follows: When the micro-volume blood gas collection device is shaken, the shaking column 4 moves inside the concave capillary tube 5. The baffle inside the Luer head 22 prevents the shaking column 4 from contacting the needle tube connected to the Luer head 22, thus preventing the shaking column 4 from hitting the needle and causing loosening, and avoiding damage to the needle due to the impact of the shaking column 4.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A micro-volume blood gas collection device, comprising a housing (1) and an end cap connected to one end of the housing (1), characterized in that: The housing (1) has a vent hole (3) on the side wall away from the end cap. The end of the end cap away from the vent hole (3) is connected to a Luer head (22). The end cap has an exhaust hole (21). A sealing plug (23) that is compatible with the exhaust hole (21) is inserted into the end cap. A concave capillary tube (5) is provided inside the housing (1). The concave capillary tube (5) has a right angle at the bend. The concave capillary tube (5) includes a short tube (51), a long tube (52), and a bottom tube (53). 53), a shaking column (4) is placed inside both the short tube (51) and the long tube (52). One end of the short tube (51) is connected to a sealing block. The end of the sealing block away from the short tube (51) is connected to the exhaust hole (21). One end of the long tube (52) is connected to the Luer head (22). The other end of the long tube (52) and the other end of the short tube (51) are connected to both ends of the bottom tube (53). The diameter of the shaking column (4) is smaller than the inner diameter of the concave capillary tube (5).

2. The micro-volume blood gas collection device according to claim 1, characterized in that: The shaking column (4) is a hollow tubular structure.

3. A micro-volume blood gas collection device according to claim 2, characterized in that: The shaking column (4) has a blood draining groove (7) at one end near the bottom tube (53).

4. A micro-volume blood gas collection device according to claim 1, characterized in that: The sealing block has a first connecting hole (61), a second connecting hole (62) and a third connecting hole (63). The first connecting hole (61) is connected to one end of the short pipe (51), the second connecting hole (62) is connected to the vent hole (21), and a hemostatic element (65) is fixedly connected in the third connecting hole (63). The hemostatic element (65) has a porous structure and is connected to the outside air. When the hemostatic element (65) comes into contact with blood, it expands and seals the third connecting hole (63).

5. A micro-volume blood gas collection device according to claim 4, characterized in that: The sealing block has a variable diameter hole (64). One end of the variable diameter hole (64) is connected to the end of the first connecting hole (61) away from the concave capillary tube (5), and the other end is connected to the second connecting hole (62). The diameter of the variable diameter hole (64) is smaller than the diameter of the shaking column (4).

6. A micro-volume blood gas collection device according to claim 1, characterized in that: A rubber tube (81) is fixed to one end of the long tube (52) near the Luer head (22). The inner diameter of the rubber tube (81) away from the long tube (52) is smaller than the outer diameter of the shaking column (4). The outer wall of the rubber tube (81) is in contact with the inner wall of the Luer head (22).

7. A micro-volume blood gas collection device according to claim 1, characterized in that: A limiting block (9) is fixedly attached to one end of the housing (1) away from the end cap. The limiting block (9) has a gradually decreasing thickness from the periphery to the center. The limiting block (9) abuts against the bottom of the concave capillary (5).

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