Arterial blood gas needle capable of realizing mutual transformation of presetting and direct drawing

Abstract

The utility model discloses an arterial blood gas needle capable of mutually converting preset blood drawing and direct blood drawing, which comprises a needle cylinder and a piston rod movably arranged in the needle cylinder, a blood drawing cavity is arranged in the needle cylinder, the piston rod slides along the inner wall of the needle cylinder in the blood drawing cavity, and the arterial blood gas needle further comprises a sealing cap used for converting preset blood drawing into direct blood drawing. And the sealing cap is detachably arranged at the top end of the piston rod, and is detachably arranged at the front end of the needle cylinder during inspection. The preset type blood gas needle is reasonable in structural design, aiming at some special patient groups such as infants and elderly patients, when blood vessel pressure in bodies of the patients is not enough to press enough blood into the needle cylinder, the sealing cap can be inserted into the top of the needle cylinder to play a sealing role and generate vacuum negative pressure, and the preset type blood gas needle is converted into a direct pumping type. The patient continues to be subjected to blood drawing in the mode of manually drawing the piston rod, and the insufficient amount of blood in the needle cylinder during preset blood drawing is supplemented.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to an arterial blood gas needle that can be converted between pre-set and direct aspiration. Background Technology

[0002] Currently, when hospitals perform blood gas tests on patients, they usually need to use arterial blood gas analyzers to collect arterial blood. Before collecting arterial blood, the doctor first presets a certain amount of blood volume in the arterial blood gas analyzer by pressing and pulling the piston rod to the desired blood volume position. During the blood collection process, under the action of the patient's own internal arterial pressure, the blood in the artery will be automatically forced into the syringe. This is medically known as "preset blood collection".

[0003] However, some special patients, such as infants and the elderly, have weaker arterial pressure due to their physical condition. This pressure may not be sufficient to force enough blood into the syringe, which may result in incomplete blood testing after the blood is sent for examination, thus affecting the accuracy of the test report. Utility Model Content

[0004] The technical problem to be solved by this invention is to provide an arterial blood gas needle that can be converted between preset and direct aspiration, in light of the current state of the technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an arterial blood gas needle that can convert between preset and direct aspiration, including a syringe and a piston rod movably disposed in the syringe. The syringe is a blood aspiration chamber, and the piston rod slides along the inner wall of the syringe in the blood aspiration chamber. It also includes a sealing cap for converting preset blood aspiration into direct aspiration. When preset blood aspiration is converted into direct aspiration, the sealing cap is detachably disposed at the top of the piston rod. When the sample is sent for testing, the sealing cap is detachably disposed at the front end of the syringe.

[0006] Preferably, the piston rod includes a rod body, with a first opening at the end of the rod body away from the syringe. The rod body includes a first cavity and a second cavity. The first cavity is located near the first opening, and the first cavity and the second cavity are separated by a filter block for filtering air but not blood.

[0007] Preferably, the outer wall of the rod has a protrusion that protrudes outward near the first opening to facilitate the pulling and sliding of the rod.

[0008] Preferably, the sealing cap includes a cap body, the outer edge of the cap body is matched with the shape of the first opening, the cap body is provided with a sealing cavity that is isolated from the outside, and the outer wall of the cap body extends outward near the middle and is provided with at least one limiting member that cooperates with and limits the boss.

[0009] Preferably, the second cavity has a second opening at the end away from the filter block, and a friction block is fixedly provided at the end of the rod near the second opening. The friction block slides synchronously with the rod in the blood drawing cavity, and the outer edge of the friction block and the inner wall of the syringe cooperate to generate friction to limit and fix it.

[0010] Preferably, the blood-drawing chamber includes a preset chamber formed by the sliding piston rod in the early stage, and the outer wall of the syringe is provided with scale lines that cooperate with the preset chamber.

[0011] Preferably, the end of the syringe away from the piston rod is provided with a retainer for engaging the sealing cap, and the center of the retainer is provided with a needle seat for inserting the blood-drawing needle. The needle seat is connected to the interior of the preset cavity. When the sample is sent for testing, the sealing cap is inserted into the retainer and the blood-drawing needle is arranged inside the sealing cap.

[0012] Compared with the prior art, the advantages of this utility model are as follows: For certain special patient groups, such as infants and elderly patients, when their own blood pressure is insufficient to force enough blood into the syringe, the sealing cap can be inserted into the top of the syringe to seal it and generate a vacuum negative pressure, converting the preset blood gas needle into a direct-draw type. Blood can then be drawn from the patient by manually pulling the piston rod, making up for the insufficient amount of blood in the syringe during the preset blood draw. After the blood draw is completed, the sealing cap can be used as a sealing plug for the needle body at the front end of the syringe, and then sent for testing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional structural diagram of the sealing cap of this utility model;

[0015] Figure 3 This is a cross-sectional structural diagram of the syringe of this utility model;

[0016] Figure 4 This is a schematic diagram of the structure of this utility model when converted into a direct blood drawing state;

[0017] Figure 5 This is a structural schematic diagram of the present invention in the inspection state.

[0018] Reference numerals: 1. Syringe; 2. Sealing cap; 3. Rod; 4. First opening; 5. First cavity; 6. Second cavity; 7. Filter block; 8. Boss; 9. Sealing cavity; 10. Limiting element; 11. Second opening; 12. Friction block; 13. Preset cavity; 14. Card holder; 15. Needle holder. Detailed Implementation

[0019] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0020] It should be noted that all directional indicators in this utility model embodiment, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, in addition to indicating orientation or positional relationship, the aforementioned terms may also be used to indicate other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. For those skilled in the art, the specific meaning of these terms in this utility model can be understood according to the specific circumstances.

[0022] Furthermore, the terms "installation," "setting," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts. The connection methods described herein are existing technologies without any modifications and are common knowledge to those skilled in the art. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] like Figures 1 to 5As shown, this utility model provides an arterial blood gas needle that can switch between preset and direct aspiration. It includes a syringe 1 and a piston rod movably disposed inside the syringe 1. The syringe 1 has a blood aspiration chamber, and the piston rod slides along the inner wall of the syringe 1 inside the blood aspiration chamber. Specifically, it also includes a sealing cap 2 for converting preset blood aspiration into direct aspiration. When preset blood aspiration is converted into direct aspiration, the sealing cap 2 is detachably disposed at the top of the piston rod. When the sample is sent for testing, the sealing cap 2 is detachably disposed at the front end of the syringe 1.

[0025] Pre-set blood collection refers to a blood collection method in which medical staff pull the piston rod out a certain distance inside the syringe 1 before drawing blood, so that a pre-set cavity 13 is formed at the front end of the syringe 1 to store blood. During the blood collection process, the blood in the artery is automatically pushed into the pre-set cavity 13 by the patient's own arterial blood pressure.

[0026] Direct blood drawing refers to a blood drawing method in which medical staff manually pull the end of the piston rod to draw blood from the patient into the syringe 1.

[0027] The piston rod includes a rod body 3, with a first opening 4 at the end of the rod body 3 away from the syringe 1. The rod body 3 includes a first cavity 5 and a second cavity 6. Specifically, the first cavity 5 is located near the first opening 4, and the first cavity 5 and the second cavity 6 are separated by a filter block 7 for filtering air but not for blood flow.

[0028] The outer wall of the rod 3 has a protrusion 8 that protrudes outward near the first opening 4 to facilitate the pulling and sliding of the rod 3.

[0029] The sealing cap 2 includes a cap body, the outer edge of which matches the shape of the first opening 4, and a sealing cavity 9 that is isolated from the outside. Specifically, at least one limiting member 10 that cooperates with and limits the protrusion 8 extends outward from the middle of the outer wall of the cap body.

[0030] The second cavity 6 has a second opening 11 at the end away from the filter block 7, and a friction block 12 is fixedly provided at the end of the rod 3 near the second opening 11; specifically, the friction block 12 slides synchronously with the rod 3 in the blood drawing cavity, and the outer edge of the friction block 12 and the inner wall of the syringe 1 cooperate to generate friction force to limit and fix it.

[0031] The blood drawing chamber includes a preset cavity 13 formed by the sliding piston rod in the early stage, and the outer wall of the syringe 1 is provided with scale lines that cooperate with the preset cavity 13.

[0032] The syringe 1 is provided with a retainer 14 for engaging the sealing cap 2 at the end away from the piston rod. The retainer 14 is provided with a needle seat 15 for inserting the blood-drawing needle at its center. Specifically, the needle seat 15 is connected to the preset cavity 13. When the sample is sent for testing, the sealing cap 2 is inserted into the retainer 14 and the blood-drawing needle is arranged inside the sealing cap 2.

[0033] The working principle of this utility model is as follows: Before drawing blood, medical staff first pull the piston rod outward a certain distance inside the syringe 1 according to the actual required blood volume and the scale line engraved on the outer wall of the syringe 1, so that the bottom of the piston is aligned with the scale line corresponding to the actual required blood volume. At this time, the space at the front end of the syringe 1 is a preset cavity 13 for storing blood. The blood-drawing needle is inserted into the patient's artery, and the blood in the artery is automatically pushed into the preset cavity 13 by the arterial pressure in the patient's own body. Before the blood enters the preset cavity 13, the preset cavity 13 is filled with air. After the blood enters the preset cavity 13, the air in the preset cavity 13 gradually passes through the second opening 11, the second cavity 6, the filter block 7 and the first cavity 5 in sequence with the entry of blood, and finally is discharged to the outside from the first opening 4.

[0034] Due to the special physical characteristics of some special patient groups, such as infants and the elderly, their arterial pressure is insufficient to draw enough blood into the preset cavity 13. That is, during the blood draw, the arterial pressure is automatically drawn into the preset cavity 13, but the blood flow stops before the preset cavity 13 is completely filled with blood. At this time, the medical staff inserts the sealing cap 2 into the first opening 4 until the limiting piece 10 on the sealing cap 2 abuts against the boss 8. Since the sealing cap 2 has a sealing cavity 9, a vacuum negative pressure is formed inside the rod 3 and the syringe 1. The medical staff manually pulls the top of the piston rod to draw the insufficient blood into the preset cavity 13, thereby achieving the required test volume.

[0035] After the blood draw is completed, the medical staff will pull the sealing cap 2 out from the top of the piston rod and insert it into the retainer 14 at the front end of the syringe 1, so that the blood drawing needle is placed inside the sealing cap 2. The sealing cap 2 protects the needle body and prevents medical staff from occupational exposure. Then the blood in the preset cavity 13 can be sent for testing.

[0036] The advantages of this invention are as follows: For certain special patient groups, such as infants and elderly patients, when their blood pressure is insufficient to pump enough blood into the syringe 1, the sealing cap 2 can be inserted into the top of the syringe 1 to seal it and create a vacuum negative pressure, converting the preset blood gas needle into a direct-draw type. Blood can then be drawn from the patient by manually pulling the piston rod, replenishing the insufficient amount of blood in the syringe 1 during the preset blood draw. After the blood draw is completed, the sealing cap 2 can be used as a sealing plug for the needle body at the front end of the syringe 1, and then sent for testing.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, welding, and bonding that are mature in the existing technology, and will not be described in detail here.

[0039] The above description is only a preferred embodiment of this utility model. For those skilled in the art, various modifications and variations can be made in the specific implementation and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An arterial blood gas needle capable of switching between preset and direct aspiration, comprising a syringe and a piston rod movably disposed within the syringe, wherein the syringe contains a blood aspiration chamber, and the piston rod slides along the inner wall of the syringe within the blood aspiration chamber, characterized in that: The sealed cap is used for converting the preset blood extraction into direct blood extraction, and is detachably arranged at the top end of the piston rod when the preset blood extraction is converted into the direct blood extraction.

2. The preset and straight extraction inter-convertible arterial blood gas needle according to claim 1, characterized in that: The piston rod comprises a rod body, and a first opening is arranged at one end of the rod body away from the needle cylinder. The rod body comprises a first cavity and a second cavity. The first cavity is arranged close to the first opening. The first cavity and the second cavity are separated by a filter block for filtering air but not flowing blood.

3. The preset and straight extraction inter-convertible arterial blood gas needle according to claim 2, characterized in that: The outer wall of the rod body is outwardly protruded at a position close to the first opening to form a boss for facilitating the extraction of the sliding rod body.

4. The preset and straight extraction inter-convertible arterial blood gas needle according to claim 3, characterized in that: The sealed cap comprises a cap body. The outer edge of the cap body is matched with the shape of the first opening. A sealed cavity is arranged in the cap body and is isolated from the outside. At least one limiting member is outwardly extended from the outer wall of the cap body at a position close to the middle part of the cap body to limit the cap body.

5. The preset and straight extraction inter-convertible arterial blood gas needle according to claim 2, characterized in that: The second cavity is provided with a second opening at one end away from the filter block. A friction block is fixed at one end of the rod body close to the second opening. The friction block is synchronous with the sliding of the rod body in the blood extraction cavity. The outer edge of the friction block is matched with the inner wall of the needle cylinder to generate a friction force for limiting and fixing.

6. The preset and straight extraction inter-convertible arterial blood gas needle according to claim 1, characterized in that: The blood extraction cavity comprises a preset cavity formed by the sliding of the piston rod in the early stage. The outer wall of the needle cylinder is provided with a scale line matched with the preset cavity.

7. The preset and straight extraction interconvertible arterial blood gas needle according to claim 6, characterized in that: The needle cylinder is provided with a clamping seat at one end away from the piston rod for clamping the sealed cap. A needle seat is arranged at the center of the clamping seat for inserting the blood extraction needle. The needle seat is communicated with the inside of the preset cavity. When the sealed cap is inserted into the clamping seat, the blood extraction needle is arranged in the sealed cap.

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