High-reliability exhaust type preset arterial blood gas needle

Abstract

The utility model relates to the technical field of medical instruments, in particular to a high-reliability exhaust type preset arterial blood gas needle which comprises a piston, a core rod, a sleeve, an exhaust plug and a needle head, the piston is arranged on the inner side of the sleeve in a sliding mode, the core rod is coaxially fixed to the end, close to an opening of the sleeve, of the piston, and a ventilation channel is formed in the piston. One end, far away from the opening of the sleeve, of the ventilation channel is filled with the venting plug, the inner side of the ventilation channel is filled with the non-return plug, the non-return plug and the venting plug are arranged in a spaced mode, the edge of the end, far away from the opening of the sleeve, of the piston is provided with a ventilation hole, the ventilation hole is communicated with the ventilation channel between the non-return plug and the venting plug, and both the venting plug and the non-return plug are ventilated without liquid. The needle is mounted at one end of the sleeve away from the opening. According to the blood gas needle, the vent holes are formed in the edge of the piston, so that bubbles which cannot be discharged can be prevented from being easily formed at dead corners between the piston and the inner wall of the sleeve when arterial blood is filled to be close to the piston, and the blood gas needle has a good application prospect.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a highly reliable pre-set arterial blood gas needle with venting capability. Background Technology

[0002] A blood gas analyzer is a medical device specifically designed to collect arterial blood samples, primarily used to measure the gaseous components in the blood to help assess a patient's respiratory and metabolic functions. Blood gas analysis is an important tool for diagnosing and treating clinical problems such as respiratory diseases, metabolic disorders, and acid-base imbalances.

[0003] However, blood gas analysis has very high requirements for blood samples. The presence of air bubbles can interfere with the accuracy of the results. Even tiny air bubbles can change the measurement results, leading to misdiagnosis or treatment delays.

[0004] In existing technologies, structures with one-way venting functions are typically used to expel air during the blood collection process. However, due to limitations in blood collection posture, blood gas needles are usually not used in a vertical position. This results in some dead zones for venting inside the syringe, requiring additional venting after blood collection. This can easily lead to blood collection failure or affect test results. Utility Model Content

[0005] In view of this, this utility model proposes a highly reliable pre-set arterial blood gas needle with a more reasonable structural design and better venting effect.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a highly reliable pre-set arterial blood gas needle with venting capability, which includes: a piston, a core rod, a sleeve, and a vent plug. The piston is slidably disposed inside the sleeve. The core rod is coaxially fixed to the end of the piston near the opening of the sleeve. A ventilation channel is provided inside the piston. The vent plug fills the end of the ventilation channel away from the opening of the sleeve. The needle is installed at the end of the sleeve away from the opening. It also includes a check plug, which fills the inside of the ventilation channel. The check plug and the vent plug are spaced apart. A vent hole is opened on the edge of the piston away from the opening of the sleeve. The vent hole communicates with the ventilation channel between the check plug and the vent plug. Both the vent plug and the check plug are for ventilation but not for fluid.

[0007] In some embodiments, a filling groove is provided at the end of the piston away from the sleeve opening, and an exhaust plug is embedded in the filling groove, with the exhaust plug flush with the piston surface.

[0008] In some implementations, the surface of the vent plug near the inside of the vent passage is flush with the inner surface of the vent passage.

[0009] In some embodiments, the surface of the check plug near the exhaust plug is parallel to the surface of the exhaust plug, and the distance between the two surfaces is 0.1-1 mm.

[0010] In some embodiments, there are multiple vent holes, which are arranged in a circumferential array along the piston.

[0011] In some embodiments, the piston is made of a polymer elastic material, and there is a dynamic seal between the piston and the inner wall of the sleeve.

[0012] In some embodiments, a connector is provided at the end of the core rod near the piston, and the connector is inserted into the inside of the opening of the ventilation channel.

[0013] In some embodiments, at least one exhaust groove is provided axially on the inner side of the opening at one end of the ventilation channel near the core rod.

[0014] The present invention has the following advantages over the prior art:

[0015] This invention provides an arterial blood gas needle with a more rational piston design. By opening a vent hole on the edge of the piston, it can prevent arterial blood from forming air bubbles that cannot be discharged in the dead corner between the piston and the inner wall of the sleeve when it is filled close to the piston. At the same time, the vent hole can introduce some blood and air bubbles into the space between the vent plug and the check plug. The check plug can discharge the remaining small air bubbles. At the same time, the side of the vent plug near the sleeve opening can be sealed. Together with the check plug, it can prevent airflow from re-entering the sleeve through the vent plug. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a main sectional view of the high-reliability pre-set arterial blood gas needle of this utility model;

[0018] Figure 2 This is a main sectional view of the piston portion in the high-reliability venting type preset arterial blood gas needle of this utility model;

[0019] Figure 3 This is a main cross-sectional view of the piston in the high-reliability venting type preset arterial blood gas needle of this utility model;

[0020] Figure 4 This is a bottom view of the piston in the high-reliability venting type preset arterial blood gas needle of this utility model;

[0021] Figure 5This is a top view of the piston in the high-reliability venting type preset arterial blood gas needle of this utility model.

[0022] In the diagram: 1-Piston, 2-Core rod, 3-Sleeve, 4-Exhaust plug, 5-Check plug, 11-Ventilation channel, 12-Ventilation hole, 13-Filling groove, 111-Exhaust groove, 21-Connector Detailed Implementation

[0023] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] like Figure 1 As shown, combined with Figure 2-5 The present invention relates to a highly reliable pre-set arterial blood gas needle with venting capability, comprising: a piston 1, a core rod 2, a sleeve 3, and a vent plug 4. The piston 1 is slidably disposed inside the sleeve 3. The core rod 2 is coaxially fixed to one end of the piston 1 near the opening of the sleeve 3. The piston 1 has a ventilation channel 11 inside. The vent plug 1 fills the end of the ventilation channel 11 away from the opening of the sleeve 3. The needle is installed at the end of the sleeve 3 away from the opening. The invention also includes a check plug 5, which fills the inside of the ventilation channel 11. The check plug 5 and the vent plug 1 are spaced apart. A vent hole 12 is provided on the edge of the piston 1 away from the opening of the sleeve 3. The vent hole 12 communicates with the ventilation channel 11 between the check plug 5 and the vent plug 4. Both the vent plug 4 and the check plug 5 are for ventilation but not for fluid.

[0027] In the above embodiments, during blood collection, the blood gas needle is usually inserted into the artery at a certain angle. At this time, the sleeve 3 is not vertical, so the blood inside is not completely parallel to the surface of the piston 1 during the rising process, but has a certain angle. In conventional blood gas needles, the vent plug 4 is only set in the middle of the end of the piston 1, and there is a certain dead angle in its circumference. If the blood completely submerges the vent plug 4, there may still be a certain space. These spaces will prevent the air bubbles from being discharged. Therefore, this application adopts a vent hole 12 set on the circumferential edge of the piston 1 to further discharge these air bubbles. When discharged, the air bubbles and blood will enter the space between the vent plug 4 and the check plug 5. After the blood soaks the back of the vent plug 4, it can prevent external gas from re-entering the sleeve 3 through the vent plug 4. The check plug 5 discharges these excess air bubbles and can cooperate with the vent plug to form a structure similar to a gas valve to prevent external gas from re-entering the inside of the sleeve 3.

[0028] In some embodiments, a filling groove 13 is provided at the end of the piston 1 away from the opening of the sleeve 3, and an exhaust plug 4 is embedded in the filling groove 13, with the exhaust plug 4 flush with the surface of the piston 1.

[0029] In the above embodiments, the filling groove 13 is used to accommodate the exhaust plug 4, and can make the end of the piston 1 near the inner side of the sleeve 3 have a relatively flat surface, reducing structures that are not conducive to the flow of blood and air bubbles, thereby making it more conducive to the exhaust of air bubbles.

[0030] In some embodiments, the surface of the exhaust plug 4 near the inner side of the ventilation channel 11 is flush with the inner surface of the ventilation channel 11.

[0031] Two flush surfaces can prevent bubbles from accumulating due to tension differences. By setting them flush, bubbles can be distributed and expelled more evenly.

[0032] In some embodiments, the surface of the check plug 5 near the exhaust plug 4 is parallel to the surface of the exhaust plug 4, and the distance between the two surfaces is 0.1-1mm.

[0033] Setting the smallest possible gap between the two surfaces allows for two advantages: firstly, the tension between the blood and the surface creates capillary action, accelerating the expulsion of gas; secondly, the tension helps form a liquid film between the two surfaces, which is more conducive to creating a seal after blood collection and preventing the intrusion of external gases.

[0034] In some embodiments, the number of vent holes 12 is multiple, and the multiple vent holes 12 are arranged in a circumferential array along the piston 1.

[0035] In the above embodiments, in order to adapt to the needs of blood collection at different angles and directions and to avoid the absence of vent holes 12 for venting at the location where bubble extreme pressure is formed, multiple vent holes 12 can be provided. The multiple vent holes 12 are arranged in a circumferential array along the piston 1, so that the vent holes 12 can vent the bubbles generated in the corners at various tilt angles.

[0036] In some embodiments, piston 1 is made of a polymer elastic material, and there is a dynamic seal between piston 1 and the inner wall of sleeve 3.

[0037] In some embodiments, the end of the core rod 2 near the piston 1 is provided with a connector 21, which is inserted into the inside of the opening of the ventilation channel 11.

[0038] In the above embodiments, the connector 21 is used to mortise and tenon connect the core rod 2 and the piston 1.

[0039] In some embodiments, at least one exhaust groove 111 is provided axially on the inner side of the opening of the ventilation channel 11 near the core rod 2.

[0040] In the above embodiments, the exhaust groove 111 is used to connect the inner side of the sleeve 3, the ventilation channel 11, and the outer side of the sleeve 3.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A highly reliable pre-set arterial blood gas needle with venting capability, comprising: The piston (1), core rod (2), sleeve (3), vent plug (4) and needle are provided. The piston (1) is slidably disposed inside the sleeve (3). The core rod (2) is coaxially fixed at one end of the piston (1) near the opening of the sleeve (3). The piston (1) is provided with a ventilation channel (11). The vent plug (4) is filled at one end of the ventilation channel (11) away from the opening of the sleeve (3). The needle is installed at one end of the sleeve (3) away from the opening. The piston (1) is characterized by further including a check plug (5). The check plug (5) is filled inside the ventilation channel (11). The check plug (5) and the vent plug (4) are spaced apart. The piston (1) is provided with a vent hole (12) at one end away from the opening of the sleeve (3). The vent hole (12) is connected to the ventilation channel (11) between the check plug (5) and the vent plug (4). The vent plug (4) and the check plug (5) are both ventilated but not liquid-permeable.

2. The highly reliable pre-set arterial blood gas needle as described in claim 1, characterized in that: A filling groove (13) is provided at the end of the piston (1) away from the opening of the sleeve (3), and an exhaust plug (4) is embedded in the filling groove (13). The exhaust plug (4) is flush with the surface of the piston (1).

3. The highly reliable pre-set arterial blood gas needle as described in claim 1, characterized in that, The surface of the exhaust plug (4) near the inside of the ventilation channel (11) is flush with the inner surface of the ventilation channel (11).

4. The highly reliable pre-set arterial blood gas needle as described in claim 3, characterized in that, The surface of the check plug (5) near the exhaust plug (4) is parallel to the surface of the exhaust plug (4), and the distance between the two surfaces is 0.1-1mm.

5. The highly reliable pre-set arterial blood gas needle as described in claim 1, characterized in that, There are multiple vent holes (12), and the multiple vent holes (12) are arranged in a circumferential array along the piston (1).

6. The highly reliable pre-set arterial blood gas needle as described in claim 1, characterized in that, The piston (1) is made of a high-molecular elastic material, and there is a dynamic seal between the piston (1) and the inner wall of the sleeve (3).

7. The highly reliable pre-set arterial blood gas needle as described in claim 1, characterized in that, The end of the core rod (2) near the piston (1) is provided with a connector (21), which is inserted into the inside of the opening of the ventilation channel (11).

8. The high-reliability pre-set arterial blood gas needle as described in claim 7, characterized in that, At least one exhaust groove (111) is provided axially on the inner side of the opening of the ventilation channel (11) near the core rod (2).

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