Pneumatic blood drawing device for endocrine diabetes mellitus blood examination

Abstract

The invention relates to the technical field of blood drawing devices, and discloses a pneumatic endocrine diabetes blood examination blood drawing device which comprises an elastic telescopic driving mechanism and a gap type flow limiting mechanism. The pneumatic type endocrine diabetes blood examination blood drawing device can be used in cooperation with a disposable needle cylinder, a power component used for driving blood drawing can be rapidly disassembled or assembled, and therefore the use cost of the device when blood drawing is conducted on different patients is reduced, and in addition, by means of flow limitation of gas in the hole-shaped structure, the device is convenient to use and high in practicability. And the speed of blood drawing and discharging can be controlled, so that negative effects caused by too high blood discharging speed are prevented.

Description

Technical Field

[0001] This invention relates to the field of blood drawing devices, specifically a pneumatic blood drawing device for endocrine diabetes blood testing. Background Technology

[0002] Currently, when conducting blood tests on diabetic patients, most of the time the blood is drawn manually by medical staff. During the blood draw, the medical staff need to observe closely from the moment the needle is inserted until the blood enters the blood sample tube. Moreover, the blood sample is completely exposed to the outside during the blood draw. Bacteria carried by the medical staff and bacteria carried by the patient may contaminate the blood sample. In addition, when there are many patients requiring blood draws, the blood draw efficiency is slow.

[0003] To address this, Chinese Patent Publication No. CN108992076A discloses a "Pneumatic Blood Collection Device for Endocrine Diabetes Blood Test." Its main structure includes a support tube, a negative pressure tube fixedly installed on the outer surface of the support tube, and an air extraction device inside the negative pressure tube. The air extraction device includes a micro motor, and a one-way tube is fixedly connected to the inner top wall of the negative pressure tube. The one-way tube contains a one-way airflow device. This pneumatic blood collection device for endocrine diabetes blood test, by using a time-delay relay, can energize and delay the start of the electromagnetic telescopic rod. Because the electromagnetic telescopic rod moves rapidly, the reaction time of a person pressing the time-delay start switch is greater than the reaction time of the electromagnetic telescopic rod. This easily leads to the rod touching the stop switch before the person's hand leaves the time-delay start switch, causing multiple punctures to the finger, increasing the pain for the person drawing blood, and making it easy for the person to release their finger, causing the negative pressure in the support tube to decrease and disappear, delaying blood collection and reducing efficiency.

[0004] However, in actual operation, the pneumatic endocrine diabetes blood test blood collection device has a high cost because the connections between its various components are integrated or difficult to disassemble and reinstall. This means that most of its core components can only be used once. When drawing blood from different patients, a new blood test blood collection device must be used, otherwise it may cause viral transmission. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pneumatic blood-drawing device for endocrine diabetes testing, which can be used with disposable syringes. The power components used to drive blood drawing can be quickly disassembled or installed, thereby reducing the cost of using the device when drawing blood from different patients. In addition, the device utilizes the flow restriction of gas inside the porous structure to control the speed of blood extraction and discharge, thereby preventing the negative effects caused by excessively fast blood discharge and solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pneumatic blood-drawing device for endocrine diabetes blood testing, comprising a transparent syringe with a stainless steel needle and a main piston, a push rod fixedly installed at one end of the main piston and capable of driving the main piston to move, a first limiting ear fixedly installed at the end of the transparent syringe near the stainless steel needle, and a second limiting ear fixedly installed at the end of the push rod; further comprising an elastic telescopic drive mechanism, which internally comprises an axially hollow tube body located between the first and second limiting ears and having a hollow interior, and two... The system includes a secondary piston housed inside the axial hollow pipe body and capable of moving with the first and second limiting ears, a helical spring that provides elastic damping against the phenomenon of the secondary pistons moving away from each other, and an intermittent flow limiting mechanism. The mechanism includes a hollow cylinder fixedly installed in the middle region of the axial hollow pipe body and having a hollow internal structure, a conical valve plate housed inside the hollow cylinder and capable of moving axially along the inside of the hollow cylinder and blocking the gas compensation channel discharge port, and a rotating cap that can drive the conical valve plate to move axially along the hollow cylinder when rotated.

[0007] Preferably, the elastic telescopic drive mechanism includes an axial hollow pipe body, a motion limiting cavity is provided at the center of the axial hollow pipe body, an axial gas intake cavity is provided at each end of the axial hollow pipe body located at the motion limiting cavity, two rod through holes are provided at each end of the axial hollow pipe body respectively communicating with the corresponding axial gas intake cavity, a gas compensation channel communicating with the motion limiting cavity is provided in the middle of the circumferential surface of the axial hollow pipe body, a secondary piston capable of moving axially along the axial gas intake cavity is placed inside the two axial gas intake cavities of the axial hollow pipe body, an axial telescopic rod passing through the rod through hole is fixedly installed at the end of the secondary piston, and a helical spring in a compressed state is placed inside the axial telescopic rod located in the axial gas intake cavity.

[0008] Preferably, when the two auxiliary pistons are located at the ports of the motion limiting cavity, there is a gap between one end of the main piston and the solid end of the inner cavity of the transparent syringe.

[0009] Preferably, the corresponding ends of the first and second limiting ears are provided with inner grooves for inserting the end structure of the axial telescopic rod.

[0010] Preferably, the intermittent flow limiting mechanism includes an externally threaded rod. One end of the hollow cylinder is provided with a conical shell integrally formed therewith. The end of the conical shell is provided with a pipe connection plate integrally formed and fixedly installed at the end of the gas compensation channel. The hollow cylinder has a cylindrical component movable cavity inside. A first gas flow hole connecting the external space and the cylindrical component movable cavity is provided at the circumferential wall thickness in the middle region of the hollow cylinder. The cylindrical component movable cavity has a conical cavity at one end near the pipe connection plate. The hollow cylinder has a structure connecting the internal structure of the gas compensation channel at one end located in the conical cavity. The second gas flow hole, the movable cavity of the cylindrical component is provided with an internal threaded hole communicating with the external space at the end face away from the pipe docking plate, the hollow cylinder is installed with a conical valve plate matching the structure of the conical cavity inside the conical cavity, one end of the conical valve plate is mounted with a rotatable fixed connecting shaft through a bearing, one end of the fixed connecting shaft is fixedly mounted with an external threaded rod, the rod body of the external threaded rod passes through the internal threaded hole, and is installed in the internal threaded hole through the through part by the internal thread structure, and a rotating cap that can drive the external threaded rod to rotate is fixedly mounted at the end of the external threaded rod located outside the hollow cylinder.

[0011] Preferably, the thickness of the conical valve plate is less than the depth of the conical cavity, and the structural radius of the end face of the conical valve plate facing the second gas flow hole is greater than the structural radius of the end face of the conical cavity facing the second gas flow hole, and the structural radius of the end face of the conical valve plate facing the movable cavity of the cylindrical component is less than the structural radius of the end face of the conical cavity facing the movable cavity of the cylindrical component.

[0012] Compared with the prior art, the present invention provides a pneumatic blood-drawing device for endocrine diabetes blood tests, which has the following beneficial effects:

[0013] It can be used with disposable syringes, and its power components for driving blood drawing can be quickly disassembled or installed, thereby reducing the cost of using the device when drawing blood from different patients. In addition, the device can control the speed of blood drawing and discharge by utilizing the flow restriction of gas inside the porous structure, thereby preventing the negative effects caused by excessively fast blood discharge. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present invention;

[0015] Figure 2 This is a perspective cross-sectional view of the present invention from a first viewpoint;

[0016] Figure 3 This is a three-dimensional cross-sectional view of the present invention from a second perspective;

[0017] Figure 4This is a three-dimensional cross-sectional view of the elastic telescopic drive mechanism in this invention;

[0018] Figure 5 This is a three-dimensional cross-sectional view of the intermittent flow limiting mechanism in this invention.

[0019] The components include: 1. Transparent syringe; 2. Stainless steel needle; 3. Main piston; 4. Push rod; 5. First limiting ear; 6. Second limiting ear; 7. Elastic telescopic drive mechanism; 71. Axial hollow pipe body; 72. Motion limiting cavity; 73. Axial gas intake cavity; 74. Rod perforation; 75. Gas compensation channel; 76. Secondary piston; 77. Axial telescopic rod; 78. Helical spring; 8. Intermittent flow limiting mechanism; 81. Hollow cylinder; 82. Conical shell; 83. Pipe connecting plate; 84. Cylindrical component movable cavity; 85. First gas flow hole; 86. Conical cavity; 87. Second gas flow hole; 88. Internal thread structure; 89. External thread rod; 810. Fixed connecting shaft; 811. Conical valve plate; 812. Rotating cap. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 , Figure 2 and Figure 3 A pneumatic blood-drawing device for endocrine diabetes blood tests includes a transparent syringe 1 with a stainless steel needle 2 and a main piston 3, a push rod 4 fixedly installed at one end of the main piston 3 and capable of driving the main piston 3 to move, a first limiting ear 5 fixedly installed at one end of the transparent syringe 1 near the stainless steel needle 2, and a second limiting ear 6 fixedly installed at the end of the push rod 4. The transparent syringe 1 is held by hand to control the overall direction of the device, the stainless steel needle 2 is inserted into the patient's body, and the transparent syringe 1 is manually operated to ensure stable operation. After the blood draw is completed, the stainless steel needle 2 is pulled out.

[0022] To achieve the driving effect of the gas and to realize the energy storage state, please refer to... Figure 1 , Figure 2 , Figure 3 and Figure 4A flexible telescopic drive mechanism 7 is required, which contains an axial hollow tube 71 located between the first limiting ear 5 and the second limiting ear 6, two auxiliary pistons 76 placed inside the axial hollow tube 71 and capable of moving with the first limiting ear 5 and the second limiting ear 6, and a helical spring 78 that provides elastic damping for the movement of the auxiliary pistons 76 away from each other. When drawing blood, pulling the second limiting ear 6 outward increases the distance between the first limiting ear 5 and the second limiting ear 6, simultaneously drawing blood into the transparent syringe 1. The two helical springs 78 are compressed, creating an energy storage state. External gas is drawn into the axial gas intake chamber 73 through the gas compensation channel 75 and the motion limiting chamber 72, creating pressure resistance. This pressure resistance is mitigated when the space is enclosed. The pressure exerted by the helical spring 78 on the gas creates resistance to the movement of the secondary piston 76, keeping the secondary piston 76 in a stable state. When blood is discharged, the internal gas flows outward, and the elastic pressure of the helical spring 78 causes the secondary piston 76 to move, thus bringing the two secondary pistons 76 closer together. At this time, the first limiting ear 5 and the second limiting ear 6 approach each other, and the blood inside the transparent syringe 1 can be discharged outward along the stainless steel needle 2, thereby achieving the driving effect of the gas and realizing the energy storage state. When the two secondary pistons 76 are located at the port of the motion limiting cavity 72, there is a gap between one end of the main piston 3 and the solid end of the inner cavity of the transparent syringe 1. The corresponding ends of the first limiting ear 5 and the second limiting ear 6 are provided with inner grooves for inserting the end structure of the axial telescopic rod 77.

[0023] For details regarding the specific structure of the elastic telescopic drive mechanism 7, please refer to [link / reference]. Figure 4 The system includes an axial hollow pipe body 71, with a motion limiting cavity 72 at its center. An axial gas intake cavity 73 is located at each end of the motion limiting cavity 72. Two rod-body through holes 74, each connecting to a corresponding axial gas intake cavity 73, are located at each end of the axial hollow pipe body 71. A gas compensation channel 75, connecting to the motion limiting cavity 72, is located at the center of the circumference of the axial hollow pipe body 71. A secondary piston 76, capable of axial movement along the axial direction of each axial gas intake cavity 73, is installed inside each of the two axial gas intake cavities 73. An axial telescopic rod 77, penetrating the rod-body through hole 74, is fixedly installed at the end of each secondary piston 76. A compressed helical spring 78 is installed inside each axial gas intake cavity 73 of the axial telescopic rod 77.

[0024] To achieve the function of limiting gas flow and thus prevent negative impacts caused by excessive component movement speed, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 3 and Figure 5 A gap-type flow-limiting mechanism 8 needs to be set up. Inside, there is a hollow cylinder 81 fixedly installed in the middle area of ​​the axial hollow pipe body 71 and with a hollow structure inside; a conical valve plate 811 placed inside the hollow cylinder 81 and able to move axially along the inside of the hollow cylinder 81 and blocking the discharge port of the gas compensation channel 5; and a rotating cap 812 that can drive the conical valve plate 811 to move axially along the hollow cylinder 81 when rotated. When the rotating cap 812 is manually rotated, due to the thread structure, the external thread rod 89 will drive the conical valve plate 811 to move, thereby controlling the gap between the conical valve plate 811 and the conical cavity 86 at the wall. By controlling the size of this gap, the maximum degree of obstruction to gas flow can be controlled, thereby controlling the movement speed of the main piston 3 during blood drawing and blood discharge, thus realizing the function of gas flow restriction and preventing the negative impact caused by excessive component movement speed.

[0025] For details regarding the specific structure of the intermittent current limiting mechanism 8, please refer to [link / reference]. Figure 5 The hollow cylinder 81 includes an externally threaded rod 89. One end of the hollow cylinder 81 is provided with a conical shell 82 integrally formed with it. The end of the conical shell 82 is provided with a pipe fitting plate 83 integrally formed and fixedly installed at the end of the gas compensation channel 75. The hollow cylinder 81 has a cylindrical component movable cavity 84 inside. A first gas flow hole 85, connecting the external space and the cylindrical component movable cavity 84, is provided at the circumferential wall thickness of the central region of the hollow cylinder 81. The cylindrical component movable cavity 84 has a conical cavity 86 at one end near the pipe fitting plate 83. The hollow cylinder 81 has a second gas flow hole 87, connecting the internal structure of the gas compensation channel 75, at one end of the conical cavity 86. The cylindrical component movable cavity 84 has an internally threaded hole, connecting to the external space, at one end away from the pipe fitting plate 83. The hollow cylinder 81 has a component installed inside the conical cavity 86. A conical valve plate 811 with matching structure is provided. One end of the conical valve plate 811 is mounted with a rotatable fixed connecting shaft 810 via a bearing. One end of the fixed connecting shaft 810 is fixedly mounted with an external threaded rod 89. The rod body of the external threaded rod 89 passes through an internal threaded hole, and is installed in the internal threaded hole through an internal thread structure 88 at the through part. A rotating cap 812 capable of driving the external threaded rod 89 to rotate is fixedly mounted at the end of the external threaded rod 89 located outside the hollow cylinder 81. The thickness of the conical valve plate 811 is less than the depth of the conical cavity 86. The structural radius of the end face of the conical valve plate 811 facing the second gas flow hole 87 is greater than the structural radius of the end face of the conical cavity 86 facing the second gas flow hole 87. The structural radius of the end face of the conical valve plate 811 facing the movable cavity 84 of the cylindrical component is less than the structural radius of the end face of the conical cavity 86 facing the movable cavity 84 of the cylindrical component.

[0026] When in use, hold the transparent syringe 1 to control the overall direction of the device, insert the stainless steel needle 2 into the patient's body, and then manually ensure the smooth operation of the transparent syringe 1. Pulling the second limiting ear 6 outward will increase the distance between the first limiting ear 5 and the second limiting ear 6. At the same time, blood is drawn into the transparent syringe 1, and the two helical springs 78 are compressed, forming an energy storage state. External gas is drawn into the axial gas intake chamber 73 through the gas compensation channel 75 and the motion limiting chamber 72, forming a pressure resistance. When the space is closed, the pressure of the helical springs 78 on the gas will resist the movement of the secondary piston 76, keeping the secondary piston 76 in a stable state. When blood is discharged, the internal gas flows outward, and the elastic pressure of the helical spring 78 causes the secondary piston 76 to move, thereby bringing the two secondary pistons 76 closer together. At this time, the first limiting ear 5 and the second limiting ear 6 approach each other, and the blood inside the transparent syringe 1 can be discharged outward along the stainless steel needle 2, thereby achieving the driving effect of the gas and realizing the energy storage state. Of course, when drawing and discharging blood, the rotating cap 812 needs to be manually rotated to control the gap between the conical valve plate 811 and the conical cavity 86 at the wall surface. Controlling the size of this gap controls the maximum degree of obstruction to the gas flow, thereby controlling the movement speed of the main piston 3 when drawing and discharging blood.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic blood-drawing device for endocrine diabetes blood tests, comprising a transparent syringe (1) with a stainless steel needle (2) and a main piston (3), a push rod (4) fixedly installed at one end of the main piston (3) and capable of driving the main piston (3) to move, a first limiting ear (5) fixedly installed at one end of the transparent syringe (1) near the stainless steel needle (2), and a second limiting ear (6) fixedly installed at the end of the push rod (4), characterized in that: It also includes, The elastic telescopic drive mechanism (7) has an axial hollow pipe body (71) located between the first limiting ear (5) and the second limiting ear (6) and is hollow inside, two auxiliary pistons (76) placed inside the axial hollow pipe body (71) and able to move with the first limiting ear (5) and the second limiting ear (6), and a helical spring (78) that produces an elastic damping effect on the phenomenon of the auxiliary pistons (76) moving away from each other; And an intermittent flow limiting mechanism (8), which is provided with a hollow cylinder (81) fixedly installed in the middle area of ​​the axial hollow pipe body (71) and having a hollow structure inside, a conical valve plate (811) placed inside the hollow cylinder (81) and able to move axially along the inside of the hollow cylinder (81) and blocking the gas compensation channel (5) discharge port, and a rotating cap (812) that can drive the conical valve plate (811) to move axially along the hollow cylinder (81) when rotating.

2. The pneumatic blood-drawing device for endocrine diabetes testing according to claim 1, characterized in that: The elastic telescopic drive mechanism (7) includes an axial hollow pipe body (71), a motion limiting cavity (72) is provided at the center of the axial hollow pipe body (71), an axial gas intake cavity (73) is provided at both ends of the axial hollow pipe body (71), two rod through holes (74) are provided at both ends of the axial hollow pipe body (71) respectively connecting to the corresponding axial gas intake cavity (73), a gas compensation channel (75) connecting to the motion limiting cavity (72) is provided in the middle of the circumferential surface of the axial hollow pipe body (71), a secondary piston (76) capable of moving along the axial direction of the axial gas intake cavity (73) is placed inside the two axial gas intake cavities (73) of the axial hollow pipe body (71), an axial telescopic rod (77) passing through the rod through hole (74) is fixedly installed at the end of the secondary piston (76), and a coil spring (78) in a compressed state is placed inside the axial gas intake cavity (73) of the axial telescopic rod (77).

3. The pneumatic blood-drawing device for endocrine diabetes testing according to claim 2, characterized in that: When the two auxiliary pistons (76) are located at the port of the motion limiting cavity (72), there is a gap between one end of the main piston (3) and the solid end of the inner cavity of the transparent syringe (1).

4. The pneumatic blood-drawing device for endocrine diabetes testing according to claim 3, characterized in that: The corresponding ends of the first limiting ear (5) and the second limiting ear (6) are provided with inner grooves for inserting the end structure of the axial telescopic rod (77).

5. A pneumatic blood-drawing device for endocrine diabetes testing according to claim 4, characterized in that: The intermittent flow limiting mechanism (8) includes an external threaded rod (89). One end of the hollow cylinder (81) is provided with a conical shell (82) integrally formed with it. The end of the conical shell (82) is provided with a pipe connection plate (83) integrally formed and fixedly installed at the end of the gas compensation channel (75). The hollow cylinder (81) is provided with a cylindrical component movable cavity (84). The circumferential wall thickness of the middle region of the hollow cylinder (81) is provided with a first gas flow hole (85) connecting the external space and the cylindrical component movable cavity (84). The cylindrical component movable cavity (84) is provided with a conical cavity (86) at one end near the pipe connection plate (83). The hollow cylinder (81) is provided with a second gas flow hole (85) at one end located in the conical cavity (86) connecting the internal structure of the gas compensation channel (75). Gas flow hole (87), the cylindrical component movable cavity (84) is provided with an internal thread hole that connects to the external space on one end face away from the pipe docking plate (83), the hollow cylinder (81) is installed with a conical valve plate (811) that matches the structure of the conical cavity (86) inside the conical cavity (86), one end of the conical valve plate (811) is installed with a rotatable fixed connecting shaft (810) through a bearing, one end of the fixed connecting shaft (810) is fixedly installed with an external thread rod (89), the rod body of the external thread rod (89) passes through the internal thread hole, and is installed in the internal thread hole through the internal thread structure (88) at the through part, and a rotating cap (812) that can drive the external thread rod (89) to rotate is fixedly installed at one end of the external thread rod (89) outside the hollow cylinder (81).

6. A pneumatic blood-drawing device for endocrine diabetes testing according to claim 5, characterized in that: The thickness of the conical valve plate (811) is less than the depth of the conical cavity (86), and the structural radius of the end face of the conical valve plate (811) facing the second gas flow hole (87) is greater than the structural radius of the end face of the conical cavity (86) facing the second gas flow hole (87). The structural radius of the end face of the conical valve plate (811) facing the cylindrical component movable cavity (84) is less than the structural radius of the end face of the conical cavity (86) facing the cylindrical component movable cavity (84).

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