Nephropathy hemodialysis sampler

Abstract

The nephropathy hemodialysis sampler comprises a needle cylinder, the end, away from a needle head, of the needle cylinder is in threaded connection with an upper connecting cylinder, a second piston tightly matched with the inner side wall of the needle cylinder is arranged in the needle cylinder, a driving and sucking assembly is arranged in the upper connecting cylinder, and a pressure adjusting assembly for controlling hydraulic pressure in the upper connecting cylinder is arranged outside the upper connecting cylinder. A positioning assembly is arranged on the pressure regulating assembly; the second piston is pulled to automatically move in the needle cylinder through cooperation of the suction driving assembly and the pressure adjusting assembly, so that the second piston moves stably and uniformly, hydraulic pressure in the upper connecting cylinder is gradually released through the pressure adjusting assembly, and the movement of the second piston is limited to a certain degree; the body discomfort of the patient caused by too high blood drawing speed is avoided; the operation of rotating the pressure adjusting assembly by a hand is effectively prompted through the positioning assembly, the moving speed of the second piston is further limited, meanwhile, the pressure adjusting assembly is prevented from being mistakenly touched and rotated through the positioning assembly, and blood is prevented from being discharged out of the needle cylinder due to mistaken touch.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a kidney disease hemodialysis sampler. Background Art

[0002] In the process of kidney disease treatment, hemodialysis is an important means of treating kidney disease. Patients with chronic renal failure who have reached the uremia stage or patients with acute renal failure can undergo dialysis treatment. Before hemodialysis, blood samples need to be taken from the patient to detect whether there are relative contraindications. Sampling generally uses a blood sampler to draw blood.

[0003] For example, Chinese patent publication number CN213406031U discloses a hemodialysis sampler for nephrology, which includes a tube body, a rod groove is provided on the top of the tube body, a first injection rod is installed inside the rod groove, one end of the first injection rod passes through the rod groove, a first push plate is installed on the top of the first injection rod, a needle tube clamp is installed on the inner top wall of the groove, a fixed needle tube is installed inside the needle tube clamp, a storage block is installed on the outside of the tube body, and a connecting line is fixed on the right side of the storage block. The hemodialysis sampler for nephrology achieves the purpose of shielding the fixed needle tube by providing a needle tube cover on the outside of the fixed needle tube, thereby avoiding the phenomenon of the fixed needle tube scratching medical staff.

[0004] For example, Chinese patent publication number CN209474623U discloses a hemodialysis sampler for nephrology, which includes a tube body, a rod groove is opened in the middle of the upper surface of the tube body, a first injection rod is movably and slidably connected inside the rod groove, a first push plate is fixedly connected to the upper surface of the first injection rod, and a first piston is fixedly connected to the end of the first injection rod away from the first push plate. By filling the inside of the first injection rod with disinfectant cotton, the inside of the tube cavity can be disinfected by the disinfectant cotton, thereby ensuring the hygiene of the inside of the sampler and preventing cross contamination caused by blood samples.

[0005] For example, Chinese patent publication number CN219397272U discloses a kidney disease hemodialysis sampler called a cross-infection prevention device, which includes a sampling tube body and a needle detachably connected to one end of the sampling tube body, and a laterally displaceable protective component is sleeved on the surface of the needle, the protective component includes a protective tube and a column connected to one side of the upper end of the protective tube, a push rod is arranged at the top of the column toward the side of the protective tube, and a push block with a bottom surface affixed to the surface of the protective tube is fixedly arranged at the end of the push rod, thereby realizing a sliding push method, which can keep the hands of medical staff away from the needle, thereby preventing the hand from being punctured and causing cross infection when the protective tube is inserted and removed.

[0006] In the above-mentioned applications, a piston is used in conjunction with a syringe to draw blood and collect samples. Since the piston shaft itself does not contact the inner wall of the syringe, when the piston handle is pulled hard, the piston shaft is prone to deviation and shaking due to deviations in manual operation, making it difficult to ensure stable and uniform movement of the piston, which can easily lead to excessive blood drawing speed and cause discomfort to the patient. At the same time, the piston needs to be pulled hard, which is more laborious to operate. When drawing blood frequently and taking large samples, the labor intensity is high.

[0007] Therefore, it is necessary to provide a renal hemodialysis sampler to solve the above technical problems. Summary of the invention

[0008] The object of the present invention is to provide a renal hemodialysis sampler to solve the problems raised in the above background technology.

[0009] To achieve the above-mentioned purpose, the solution of the present invention to the above-mentioned technical problem is as follows: a renal disease hemodialysis sampler, comprising a syringe, one end of the syringe is connected to a needle, the end of the syringe away from the needle is threadedly connected to an upper connecting tube, the syringe is provided with a second piston tightly fitted with the inner wall of the syringe, the upper connecting tube is provided with a suction component for pulling the second piston to move inside the syringe by releasing the hydraulic pressure to form negative pressure suction, the outside of the upper connecting tube is provided with a pressure regulating component for controlling the hydraulic pressure inside the upper connecting tube, and the pressure regulating component is provided with a positioning component for prompting to prevent the second piston from sucking too quickly.

[0010] As a further solution of the present invention, the drive and suction assembly includes an inner connecting plate fixed on the inner wall of the upper connecting tube and located at one end of the upper connecting tube away from the syringe, a connecting rod sliding through the side wall of the upper connecting tube end is fixed at the center of the second piston, a joint circular plate is fixed on one end of the connecting rod located in the upper connecting tube, a sealing rubber ring tightly attached to the inner wall of the upper connecting tube is fixed on the edge side of the joint circular plate, a spring is provided inside the upper connecting tube between the inner connecting plate and the joint circular plate, and both ends of the spring are respectively fixed to the joint circular plate and the side of the inner connecting plate.

[0011] As a further solution of the present invention, the pressure regulating assembly includes an external connecting tube fixed on the side wall of the upper connecting tube and connected to the interior of the upper connecting tube, an end seat is fixed on the end of the external connecting tube away from the upper connecting tube, a nut sleeve is rotatably connected to the end seat through a bearing, a threaded rod inserted into the external connecting tube is threadedly connected to the nut sleeve, a first piston tightly fitted with the inner side wall of the external connecting tube is fixed on one end of the threaded rod located in the external connecting tube, a sliding groove arranged along the length direction of the threaded rod is opened on the side surface of the threaded rod, and a guide rod slidingly adapted to the sliding groove is fixed on the inner side wall of the external connecting tube.

[0012] As a further solution of the present invention, a rotating head is fixed to the end of the nut sleeve, and a rubber sleeve is fitted on the surface of the rotating head.

[0013] As a further solution of the present invention, an end plate is fixed on the outer end of the threaded rod, and the diameter of the end plate is larger than the outer diameter of the threaded rod.

[0014] As a further solution of the present invention, the positioning assembly includes a second arc-shaped protrusion fixed on the side of the rotating head column, the second arc-shaped protrusion is provided with a plurality of second arc-shaped protrusions and the plurality of second arc-shaped protrusions are distributed in an equidistant ring shape, a metal spring is fixed on the outer wall of the end seat, and a first arc-shaped protrusion is fixed on the end of the metal spring away from the end seat and is engaged between two adjacent second arc-shaped protrusions.

[0015] As a further solution of the present invention, a transition arc section is arranged in the middle of the metal spring piece, and the length of the second arc-shaped protrusion is greater than the length of the first arc-shaped protrusion.

[0016] As a further solution of the present invention, a stop assembly for stopping the threaded rod is provided on the side of the rotating head, and the stop assembly includes a convex column fixed on the side of the rotating head away from the end seat, and a baffle is rotatably connected to the end head of the convex column to stop and limit the end plate at the end of the threaded rod in a retracted state.

[0017] As a further solution of the present invention, a rubber sleeve is provided between the convex column and the baffle plate, and a rubber pad is fitted and fixed on the side of the baffle plate close to the end plate.

[0018] As a further solution of the present invention, a terminal plate is fixed to one end of the upper connecting cylinder away from the syringe, and the spring is arranged at the center of the upper connecting cylinder.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. The second piston is automatically moved inside the syringe by pulling the second piston through the cooperation of the driving and suction components and the pressure regulating components, so that the movement of the second piston is stable and uniform, thereby effectively improving the uniformity of blood aspiration, effectively reducing the possibility of human operation errors, and improving the reliability and safety of the overall operation of blood sampling. At the same time, the operation of manually pulling the piston is omitted, manpower is saved, the tediousness and labor intensity of manual operation are reduced, and the efficiency and convenience of blood sampling operation are improved. The overall structure is relatively simple and easy to operate; 2. The hydraulic pressure inside the upper connecting tube is gradually released by manually rotating the pressure regulating component, thereby limiting the moving speed of the second piston pulled by the driving and suction component to a certain extent, which can effectively prevent the medical staff from operating it incorrectly or the unintentional touch of irrelevant personnel from causing the second piston to move too fast, thereby avoiding the patient's physical discomfort caused by the excessively fast blood drawing speed; 3. When the blood sample temporarily stored in the syringe needs to be deposited in the sampling bottle, the liquid is squeezed into the interior of the upper connecting tube through the pressure regulating assembly, thereby restoring the hydraulic pressure inside the upper connecting tube. By applying the Pascal principle, the manually applied small pressure is amplified several times to push the second piston toward the needle, so that the blood sample in the syringe can be quickly squeezed into the sample bottle with particularly little effort, and the storage of the blood sample is completed, which effectively improves the convenience and effort-saving of the operation of pushing the blood out of the syringe; 4. When the second piston moves inside the syringe to draw blood, the positioning component is used to effectively prompt the operator to rotate the pressure regulating component, so that the operator can rotate it slowly and evenly, thereby further limiting the movement speed of the second piston to avoid drawing blood too quickly. At the same time, the positioning component is used to limit and lock the pressure regulating component in real time to avoid accidental touching of the rotating pressure regulating component, which causes the second piston to move in the opposite direction and squeeze blood out of the syringe. This can effectively prevent partial blood discharge or reflux caused by misoperation by medical staff or accidental touching by unrelated personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a three-dimensional diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall side view structure of the present invention; Figure 3 The overall cross-sectional structure of the present invention is schematically shown Figure 1 ; Figure 4 for Figure 3 A magnified view of the structure at center; Figure 5 The overall cross-sectional structure of the present invention is schematically shown Figure 2 ; Figure 6 The local structure of the positioning component of the present invention is shown in FIG. Figure 1 ; Figure 7 It is a schematic diagram of the local structure of the chute of the present invention; Figure 8 The local structure of the positioning component of the present invention is shown in FIG. Figure 2 ; Fig. 9 It is a schematic diagram of the syringe and needle structure of the present invention; Fig.10 It is a schematic diagram of the structure of the upper connecting tube and the terminal plate of the present invention.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Drive and suction assembly; 101. Connecting rod; 102. Joint circular plate; 103. Sealing rubber ring; 104. Spring; 105. Internal plate; 2. Pressure regulating assembly; 201. First piston; 202. Threaded rod; 203. Slide groove; 204. Nut sleeve; 205. Rotary head; 206. Guide rod; 207. External tube; 208. End seat; 209. End plate; 3. Positioning assembly; 301. Metal spring; 302. First arc-shaped protrusion; 303. Second arc-shaped protrusion; 304. Transition arc segment; 4. Stop assembly; 401. Boss; 402. Baffle plate; 403. Rubber sleeve; 5. Upper tube; 6. Syringe; 7. Needle; 8. End plate; 9. Second piston. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments.

[0023] See also Figure 1-10 The present invention provides a hemodialysis sampler for kidney disease, comprising a syringe 6, one end of the syringe 6 is connected with a needle 7, and the end of the syringe 6 away from the needle 7 is threadedly connected with an upper connecting tube 5, a second piston 9 is arranged inside the syringe 6 and closely matches with the inner wall of the syringe 6, and a suction component 1 is arranged inside the upper connecting tube 5 for pulling the second piston 9 to move inside the syringe 6 by releasing the hydraulic pressure to form negative pressure suction, a pressure regulating component 2 for controlling the internal hydraulic pressure of the upper connecting tube 5 is arranged outside the upper connecting tube 5, a positioning component 3 is arranged on the pressure regulating component 2 to prompt to avoid the second piston 9 from sucking too fast, and a stop component 4 for stopping the threaded rod 202 is arranged on the side of the rotating head 205; when blood sampling is performed, a certain amount of liquid is filled inside the upper connecting tube 5, and the interior of the upper connecting tube 5 has a certain hydraulic pressure, and the second piston 9 is hydraulically pressed to be located at one end of the syringe 6 near the needle 7, and when blood is drawn, the needle 7 is inserted into the human body, and the liquid inside the upper connecting tube 5 is discharged through the pressure regulating component 2. The pressure is released to release the pressure of the hydraulic pressure in the upper connecting tube 5 on the driving and suction component 1, so that the restoring tension of the elastic member in the driving and suction component 1 pulls the second piston 9 to automatically move inside the syringe 6, and the second piston 9 moves in the direction away from the needle 7. A negative pressure chamber is formed between the second piston 9 and the bottom of the inner cavity of the syringe 6 to suck the blood, and the blood flows through the needle 7 into the negative pressure chamber of the syringe 6. The interior of the syringe 6 is used to temporarily store the blood sample to complete the blood sampling. The second piston 9 is pulled to automatically move inside the syringe 6 through the cooperation of the driving and suction component 1 and the pressure regulating component 2, so that the movement of the second piston 9 is smooth and uniform, thereby effectively improving the uniformity of blood suction, effectively reducing the possibility of human operation errors, and improving the reliability and safety of the overall operation of blood sampling. At the same time, the operation of manually pulling the piston is omitted, manpower is saved, the cumbersomeness and labor intensity of manual operation are reduced, and the efficiency and convenience of blood sampling operation are improved. The overall structure is relatively simple and easy to operate. The pressure regulating component 2 is manually rotated to gradually release the hydraulic pressure inside the upper connecting tube 5, thereby limiting the moving speed of the second piston 9 pulled by the suction component 1 to a certain extent, and can effectively prevent the medical staff from misoperating or unintentionally touching the second piston 9 so as to cause the second piston 9 to move too fast, thereby avoiding the patient's physical discomfort caused by the excessive blood drawing speed; when the blood sample temporarily stored in the syringe 6 needs to be deposited in the sampling bottle, the liquid is squeezed into the interior of the upper connecting tube 5 through the pressure regulating component 2, thereby restoring the hydraulic pressure inside the upper connecting tube 5, and by applying the Pascal principle, the manually applied small pressure is amplified several times to push the second piston 9 to move in the direction close to the needle 7, so that the blood inside the syringe 6 can be particularly labor-saving. The sample is quickly squeezed into the sample bottle to complete the storage of the blood sample, which effectively improves the convenience and effort-saving of the blood transfer operation from the inside of the syringe 6; when the second piston 9 moves inside the syringe 6 to draw blood, the positioning component 3 is used to effectively prompt the operation of manually rotating the pressure regulating component 2, so that the hand can rotate it slowly and evenly, thereby further limiting the moving speed of the second piston 9 to avoid excessive blood drawing. At the same time, the positioning component 3 is used to limit and lock the pressure regulating component 2 in real time to avoid accidental touching of the rotating pressure regulating component 2, which causes the second piston 9 to move in the opposite direction to squeeze blood out of the syringe 6, which can effectively prevent partial blood discharge or reflux caused by misoperation by medical staff or accidental touching by unrelated personnel.

[0024] Further as Figure 1 , Figure 3 and Figure 5As shown, it is worth specifically explaining that the drive and suction assembly 1 includes an inner connecting plate 105 fixed on the inner side wall of the upper connecting tube 5 and located at one end of the upper connecting tube 5 away from the syringe 6, a connecting rod 101 is fixed at the center of the second piston 9 and slides through the side wall of the end of the upper connecting tube 5, a joint circular plate 102 is fixed on one end of the connecting rod 101 located in the upper connecting tube 5, and a sealing rubber ring 103 that is tightly attached to the inner side wall of the upper connecting tube 5 is fixed on the edge side of the joint circular plate 102, and the upper connecting tube 5 is provided with a sealing rubber ring 103 located between the inner connecting plate 105 and the joint. The spring 104 between the circular plates 102, the two ends of the spring 104 are respectively fixed to the side of the joint circular plate 102 and the inner plate 105; when drawing blood, the interior of the upper connecting tube 5 is filled with a certain amount of liquid, and the interior of the upper connecting tube 5 has a certain hydraulic pressure, so that the joint circular plate 102 is pressed against the inner wall of one end of the upper connecting tube 5 by hydraulic pressure, so that the second piston 9 is located at one end of the syringe 6 near the needle 7. At this time, the spring 104 is in a stretched state. When drawing blood, the upper connecting tube is pressed by the pressure regulating component 2. 5, the hydraulic pressure inside the upper connecting tube 5 is released, the pressure of the joint circular plate 102 by the hydraulic pressure inside the upper connecting tube 5 is released, the length of the spring 104 is restored, and the joint circular plate 102 and the connecting rod 101 are pulled by the spring 104 to move in the direction away from the needle 7, thereby pulling the second piston 9 in the syringe 6 in the direction away from the needle 7 through the connecting rod 101, and a negative pressure chamber is formed between the second piston 9 and the bottom of the inner cavity of the syringe 6 to suck blood, and the blood flows through the needle 7 into the negative pressure chamber of the syringe 6. The inside of the syringe 6 is used to temporarily store the blood sample to complete the blood sampling, and the second piston 9 is pulled by the spring 104 to automatically move inside the syringe 6, so that the movement of the second piston 9 is smooth and uniform, thereby effectively improving the uniformity of blood suction, effectively reducing the possibility of human operation errors, and improving the reliability and safety of the overall operation of blood sampling. At the same time, the operation of manually pulling the piston is omitted, manpower is saved, the cumbersomeness and labor intensity of manual operation are reduced, and the efficiency and convenience of blood sampling operation are improved. The overall structure is relatively simple and easy to operate.

[0025] Further as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7As shown, it is worth specifically explaining that the pressure regulating assembly 2 includes an external connection tube 207 fixed on the side wall of the upper connection tube 5 and connected to the interior of the upper connection tube 5, an end seat 208 is fixed on the end of the external connection tube 207 away from the upper connection tube 5, a nut sleeve 204 is rotatably connected in the end seat 208 through a bearing, a threaded rod 202 inserted into the external connection tube 207 is connected to the inner thread of the nut sleeve 204, a first piston 201 tightly matched with the inner side wall of the external connection tube 207 is fixed on one end of the threaded rod 202 located in the external connection tube 207, a slide groove 203 arranged along the length direction of the threaded rod 202 is opened on the side of the threaded rod 202, and the external connection tube A guide rod 206 is fixed on the inner wall of 207, which is slidably matched with the slide groove 203. When drawing blood, the rotating head 205 is rotated outward, and the rotating head 205 drives the nut sleeve 204 to rotate. At the same time, the threaded rod 202 is guided and limited by the cooperation of the guide rod 206 and the slide groove 203, so that the threaded rod 202 is driven by the rotating nut sleeve 204 to move out of the outer tube 207, and the threaded rod 202 drives the first piston 201 to move away from the upper tube 5, so that the liquid in the upper tube 5 can flow into the outer tube 207, releasing the hydraulic pressure in the upper tube 5, so that the spring 104 is restored. The original pull joint circular plate 102 moves in the direction away from the needle 7, and then pulls the second piston 9 to draw the blood into the syringe 6 for temporary storage. The hydraulic pressure inside the upper connecting tube 5 is gradually released by manual rotation, thereby limiting the movement speed of the second piston 9 pulled by the connecting rod 101 to a certain extent, which can effectively prevent the medical staff from misoperating or the unintentional touch of irrelevant personnel causing the second piston 9 to move too fast, thereby avoiding the patient's physical discomfort caused by the excessive blood drawing speed. When the blood sample temporarily stored in the syringe 6 needs to be deposited in the sampling bottle, the threaded rod 202 is moved into the external connecting tube 6 by rotating the nut sleeve 204 in the opposite direction. The outer connecting tube 207 is squeezed into the upper connecting tube 5 by the first piston 201, thereby restoring the hydraulic pressure inside the upper connecting tube 5. The area of ​​the joint circular plate 102 is several times the area of ​​the first piston 201. Therefore, through the Pascal principle, the smaller thrust manually applied to the first piston 201 is amplified several times to push the joint circular plate 102, the connecting rod 101 and the second piston 9 toward the needle 7. The blood sample inside the syringe 6 can be quickly squeezed into the sample bottle with particularly little effort, and the blood sample is stored, which effectively improves the convenience and effort-saving of the blood transfer operation from the inside of the syringe 6.

[0026] Further as Figure 4 , Figure 6 and Figure 7 As shown, it is worth explaining in detail that a rotating head 205 is fixed at the end of the nut sleeve 204, and the surface of the rotating head 205 is fitted with a rubber sleeve; during specific work, the nut sleeve 204 can be rotated conveniently through the rotating head 205, which is convenient for operation.

[0027] Further as Figure 1 , Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, it is worth specifically explaining that the positioning assembly 3 includes a second arc-shaped protrusion 303 fixed on the side surface of the rotating head 205 column, and the second arc-shaped protrusion 303 is provided with a plurality of second arc-shaped protrusions 303 and the plurality of second arc-shaped protrusions 303 are equidistantly distributed in an annular shape, and a metal spring 301 is fixed on the outer wall of the end seat 208, and a first arc-shaped protrusion 302 that is engaged between two adjacent second arc-shaped protrusions 303 is fixed on the end of the metal spring 301 away from the end seat 208; when the rotating head 205 rotates, the rotating head 205 drives the second arc-shaped protrusion 303 to rotate relative to the first arc-shaped protrusion 302, and the first arc-shaped protrusion 302 is made to rotate by the metal spring 301. 2 continuously bounces up and gets stuck between two adjacent second arc-shaped protrusions 303, generating a prompting sound, thereby effectively prompting the operation of manually rotating the rotating head 205, so that the human hand can rotate it slowly and evenly, thereby further limiting the moving speed of the second piston 9 to avoid excessive blood drawing speed. At the same time, the first arc-shaped protrusion 302 and the second arc-shaped protrusion 303 are provided to cooperate with the rotating head 205 to perform real-time limit locking, thereby avoiding accidental touching of the rotating head 205, causing the second piston 9 to move in the opposite direction to squeeze blood out of the syringe 6, which can effectively prevent partial blood discharge or backflow caused by misoperation by medical staff or accidental touching by irrelevant personnel.

[0028] Further as Figure 4 and Figure 8 As shown, it is worth explaining in detail that a transition arc segment 304 is set in the middle of the metal spring piece 301, and the length of the second arc-shaped protrusion 303 is greater than the length of the first arc-shaped protrusion 302; during specific operation, the transition arc segment 304 is set to avoid stress concentration and improve the service life of the metal spring piece 301.

[0029] The present solution has the following working process: when drawing blood for sampling, the interior of the upper connecting tube 5 has a certain hydraulic pressure, so that the joint circular plate 102 is pressed by the hydraulic pressure to be close to the inner side wall of one end of the upper connecting tube 5, so that the second piston 9 is located at one end of the syringe 6 close to the needle 7. At this time, the spring 104 is in a stretched state. When drawing blood, the rotating head 205 is rotated outward, and the rotating head 205 drives the nut sleeve 204 to rotate. At the same time, the threaded rod 202 is guided and limited by the cooperation of the guide rod 206 and the slide groove 203, so that the threaded rod 202 is moved out of the interior of the external connecting tube 207 by the rotating nut sleeve 204, and the threaded rod 202 drives the first piston 2 01 moves in the direction away from the upper connecting tube 5, so that the liquid inside the upper connecting tube 5 can flow into the outer connecting tube 207, and the hydraulic pressure inside the upper connecting tube 5 is released, thereby releasing the pressure of the hydraulic pressure inside the upper connecting tube 5 on the joint circular plate 102, and the length of the spring 104 is restored, and the joint circular plate 102 and the connecting rod 101 are pulled by the spring 104 to move in the direction away from the needle 7, thereby pulling the second piston 9 in the syringe 6 in the direction away from the needle 7 through the connecting rod 101, and a negative pressure chamber is formed between the second piston 9 and the bottom of the inner cavity of the syringe 6 to suck blood, and the blood flows through the needle 7 into the negative pressure chamber of the syringe 6, and the interior of the syringe 6 is used to temporarily store blood samples to complete blood sampling; When the blood sample temporarily stored in the syringe 6 needs to be deposited into the sampling bottle, the threaded rod 202 is moved into the external connection tube 207 by rotating the nut sleeve 204 in the opposite direction, so that the liquid in the external connection tube 207 is squeezed into the upper connection tube 5 by the first piston 201, thereby restoring the hydraulic pressure inside the upper connection tube 5. The area of ​​the joint circular plate 102 is several times that of the first piston 201, so that the small thrust manually applied to the first piston 201 is amplified several times to push the joint circular plate 102, the connecting rod 101 and the second piston 9 to move in the direction close to the needle 7 through the Pascal principle, so that the blood sample in the syringe 6 can be quickly squeezed into the sample bottle with great effort, and the storage of the blood sample is completed; When the rotating head 205 is rotated, the rotating head 205 drives the second arc-shaped protrusion 303 to rotate relative to the first arc-shaped protrusion 302. The metal spring piece 301 makes the first arc-shaped protrusion 302 constantly bounce up and get stuck between two adjacent second arc-shaped protrusions 303, producing a prompt sound, thereby effectively prompting the operation of rotating the rotating head 205 by hand, so that the hand can rotate it slowly and evenly, thereby further limiting the moving speed of the second piston 9 to avoid the blood drawing speed being too fast. At the same time, the first arc-shaped protrusion 302 and the second arc-shaped protrusion 303 are provided to cooperate with the rotating head 205 to perform real-time limit locking, thereby avoiding accidental touching of the rotating head 205, which causes the second piston 9 to move and squeeze out part of the blood from the inside of the syringe 6.

[0030] Further as Figure 4 and Figure 6 As shown, it is worth mentioning that an end plate 209 is fixed on the outer end of the threaded rod 202, and the diameter of the end plate 209 is larger than the outer diameter of the threaded rod 202; during specific operation, the end plate 209 is set to prevent excessive movement of the threaded rod 202, thereby preventing the threaded rod 202 from falling out of the nut sleeve 204.

[0031] Further as Figure 1 , Figure 6 and Figure 7 As shown, it is worth specifically explaining that the stop assembly 4 includes a boss 401 fixed on the side of the rotating head 205 away from the end seat 208, and the end of the boss 401 is rotatably connected to a baffle 402 for stopping and limiting the end plate 209 at the end of the threaded rod 202 in a retracted state; during specific operation, when the second piston 9 is located at one end of the syringe 6 close to the needle 7, the spring 104 is in a stretched state, and the threaded rod 202 is retracted into the external connection tube 207. By rotating the baffle 402 to one side of the end plate 209, the end plate 209 is stopped by the baffle 402, and then the position of the first piston 201 is limited to prevent the first piston 201 and the threaded rod 202 from moving outward, ensuring that there is a stable hydraulic pressure inside the upper connection tube 5, keeping the spring 104 in a stable stretched state, and facilitating the next blood sampling.

[0032] Further as Figure 6 As shown, it is worth explaining in detail that a rubber sleeve 403 is arranged between the protruding column 401 and the baffle 402, and a rubber pad is fixed on the side of the baffle 402 close to the end plate 209; during specific operation, the set rubber sleeve 403 can effectively increase the rotational friction resistance of the baffle 402, and the rubber sleeve 403 and the rubber pad cooperate to improve the stopping and limiting stability of the baffle 402 on the end plate 209.

[0033] Further as Figure 1 , Figure 3 and Fig.10 As shown, it is worth explaining in detail that a terminal plate 8 is fixed to one end of the upper connecting tube 5 away from the needle tube 6 , and a spring 104 is arranged at the center of the upper connecting tube 5 .

[0034] In summary: through the cooperation of the suction component 1 and the pressure regulating component 2, the second piston 9 is pulled to automatically move inside the syringe 6, so that the movement of the second piston 9 is smooth and uniform, thereby effectively improving the uniformity of blood suction, effectively reducing the possibility of human operation errors, and improving the reliability and safety of the overall operation of blood sampling. At the same time, the operation of manually pulling the piston is omitted, manpower is saved, the tediousness and labor intensity of manual operation are reduced, and the efficiency and convenience of blood sampling operation are improved. The overall structure is relatively simple and easy to operate. The pressure regulating component 2 adopts a manual rotation method to gradually release the hydraulic pressure inside the upper connecting tube 5, thereby limiting the movement speed of the second piston 9 pulled by the suction component 1 to a certain extent, which can effectively prevent the medical staff from misoperating or unintentionally touching the second piston 9 so as to cause the second piston 9 to move too fast, thereby avoiding the patient's physical discomfort caused by excessive blood drawing speed; when the blood sample temporarily stored in the syringe 6 needs to be deposited in the sampling bottle, the liquid is squeezed into the The interior of the upper connecting tube 5 is moved to restore the hydraulic pressure inside the upper connecting tube 5. By applying the Pascal principle, the manually applied small pressure is amplified several times to push the second piston 9 to move in the direction close to the needle 7, so that the blood sample inside the syringe 6 can be quickly squeezed into the sample bottle with particular effort, and the storage of the blood sample is completed, effectively improving the convenience and effort-saving of the blood transfer operation from the inside of the syringe 6; when the second piston 9 moves inside the syringe 6 to draw blood, the positioning component 3 is used to effectively prompt the operation of manually rotating the pressure regulating component 2, so that the human hand can rotate it slowly and at a relatively uniform speed, thereby further limiting the moving speed of the second piston 9 to avoid excessive blood drawing speed. At the same time, the positioning component 3 is used to limit and lock the pressure regulating component 2 in real time to avoid accidental touching of the rotating pressure regulating component 2, which causes the second piston 9 to move in the opposite direction to squeeze blood out of the syringe 6, which can effectively prevent partial blood discharge or reflux caused by misoperation of medical staff or accidental touching by unrelated personnel.

Claims

1. A kidney disease hemodialysis sampler, comprising a syringe (6), It is characterized in that One end of the syringe (6) is connected to a needle (7), and the end of the syringe (6) away from the needle (7) is threadedly connected to an upper connecting tube (5). A second piston (9) tightly matched with the inner wall of the syringe (6) is arranged inside the syringe (6). A suction component (1) is arranged inside the upper connecting tube (5) for pulling the second piston (9) to move inside the syringe (6) by releasing hydraulic pressure to form negative pressure suction. A pressure regulating component (2) for controlling the hydraulic pressure inside the upper connecting tube (5) is arranged outside the upper connecting tube (5), and a positioning component (3) is arranged on the pressure regulating component (2) for prompting to prevent the second piston (9) from sucking too quickly.

2. The renal hemodialysis sampler according to claim 1, It is characterized in that The drive and suction assembly (1) comprises an inner connecting plate (105) fixed on the inner side wall of the upper connecting tube (5) and located at one end of the upper connecting tube (5) away from the syringe (6); a connecting rod (101) is fixed at the center of the second piston (9) and slides through the end side wall of the upper connecting tube (5); a joint circular plate (102) is fixed on one end of the connecting rod (101) located inside the upper connecting tube (5); a sealing rubber ring (103) is fixed on the edge side of the joint circular plate (102) and is tightly attached to the inner side wall of the upper connecting tube (5); a spring (104) is arranged inside the upper connecting tube (5) and is located between the inner connecting plate (105) and the joint circular plate (102); and two ends of the spring (104) are respectively fixed to the side surfaces of the joint circular plate (102) and the inner connecting plate (105).

3. The renal hemodialysis sampler according to claim 2, It is characterized in that The pressure regulating assembly (2) comprises an external connecting tube (207) fixed on the side wall of the upper connecting tube (5) and connected to the interior of the upper connecting tube (5); an end seat (208) is fixed on one end of the external connecting tube (207) away from the upper connecting tube (5); a nut sleeve (204) is rotatably connected to the end seat (208) via a bearing; the nut sleeve (204) is internally threadedly connected to a threaded rod (202) inserted into the external connecting tube (207); a first piston (201) is fixed on one end of the threaded rod (202) located in the external connecting tube (207) and tightly fits with the inner side wall of the external connecting tube (207); a sliding groove (203) is provided on the side surface of the threaded rod (202) and is arranged along the length direction of the threaded rod (202); and a guide rod (206) is fixed on the inner side wall of the external connecting tube (207) and is slidably matched with the sliding groove (203).

4. The renal hemodialysis sampler according to claim 3, It is characterized in that A rotating head (205) is fixed to the end of the nut sleeve (204), and a rubber sleeve is fitted on the surface of the rotating head (205).

5. The renal hemodialysis sampler according to claim 4, It is characterized in that An end plate (209) is fixed to the outer end of the threaded rod (202), and the diameter of the end plate (209) is larger than the outer diameter of the threaded rod (202).

6. The renal hemodialysis sampler according to claim 4, It is characterized in that The positioning assembly (3) comprises a second arc-shaped protrusion (303) fixed on the side surface of the rotating head (205), the second arc-shaped protrusion (303) is provided with a plurality of second arc-shaped protrusions (303) and the plurality of second arc-shaped protrusions (303) are distributed in an equidistant annular pattern, a metal spring (301) is fixed on the outer wall of the end seat (208), and a first arc-shaped protrusion (302) that is engaged between two adjacent second arc-shaped protrusions (303) is fixed on one end of the metal spring (301) away from the end seat (208).

7. The renal hemodialysis sampler according to claim 6, It is characterized in that A transition arc section (304) is provided in the middle of the metal spring (301), and the length of the second arc-shaped protrusion (303) is greater than the length of the first arc-shaped protrusion (302).

8. The renal hemodialysis sampler according to claim 6, It is characterized in that A stop assembly (4) for stopping the threaded rod (202) is provided on the side of the rotating head (205), the stop assembly (4) comprising a boss (401) fixed on the side of the rotating head (205) away from the end seat (208), a baffle (402) rotatably connected to the end of the boss (401) for stopping and limiting the end plate (209) at the end of the threaded rod (202) in a retracted state.

9. The renal hemodialysis sampler according to claim 8, It is characterized in that A rubber sleeve (403) is provided between the convex column (401) and the baffle plate (402), and a rubber pad is fitted and fixed on the side surface of the baffle plate (402) close to the end plate (209).

10. The renal hemodialysis sampler according to claim 2, It is characterized in that A terminal plate (8) is fixed to one end of the upper connecting tube (5) away from the needle tube (6), and the spring (104) is arranged at the center of the upper connecting tube (5).

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