Dialysis sampler

Abstract

The utility model relates to a dialysis sampler, which effectively solves the problem that the operation is complicated when a blood sample is taken from a patient with a central venous indwelling catheter. Comprising a syringe with forward openings and two cavities, piston plates are slidably connected into the two cavities respectively, piston rods are fixed to the front ends of the piston plates, a first push groove with a rightward opening is formed in the piston rod on the left side, and a second push groove which is located in front of the first push groove and provided with a leftward opening is formed in the piston rod on the right side; a kidney-shaped groove with a forward opening in the front-back direction is formed in the middle of the syringe, a kidney-shaped block is slidably connected into the kidney-shaped groove, a transverse rod in the left-right direction is slidably connected to the kidney-shaped block, the rear ends of the two cavities are communicated with a three-way pipe, and a needle head is installed at the free end of the three-way pipe; the syringe packaging bag is ingenious in structure and convenient to use, packaging bags of two syringes do not need to be opened twice, needle heads do not need to be inserted and pulled repeatedly, operation is easy, time is saved, sampling quality is guaranteed, and diagnosis and treatment of diseases are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary instruments, in particular to a dialysis sampler. Background Art

[0002] Hemodialysis patients need to have a major blood test every three months, including blood sample tests such as comprehensive biochemistry, renal function II, coagulation items, blood routine, hepatitis markers, bone metabolism, parathyroid function, etc., so that hemodialysis doctors can better understand the dialysis situation of patients and better formulate dialysis plans according to the test results, mainly including the adjustment of dialysis medications and dietary guidance;

[0003] For the collection of blood samples, blood can be drawn before or after dialysis. For blood drawn before dialysis, the method of blood collection needs to be determined according to the patient's arteriovenous fistula or central venous catheter. For those with arteriovenous fistulas, blood is directly drawn from the venous end of the fistula puncture needle before dialysis starts; for those with central venous catheters, before dialysis, a dry 20-ml syringe is used to draw 10 ml of blood and discarded first, and then a dry 20-ml syringe is replaced to draw the required amount of blood, and the corresponding amount of blood is injected into the test tubes as required, and then sent for inspection to avoid dilution of blood samples by heparinized catheter solution, etc.

[0004] During the process of taking blood samples from patients with central venous catheters, medical staff need to open two newly packaged syringes, insert and remove the needles and replace the syringes multiple times, which is cumbersome in operation, reduces the sampling efficiency, and medical staff also need to observe the amount of blood drawn for the first time, not too much or too little, so as not to affect the quality of the sample and cause inaccurate test results. Summary of the Utility Model

[0005] In view of the above situation, in order to overcome the deficiencies of the prior art, the purpose of the present utility model is to provide a dialysis sampler, which effectively solves the problem of cumbersome operation when taking blood samples from patients with central venous catheters.

[0006] The technical solution it adopts is that the utility model includes a syringe barrel with an opening facing forward and two chambers. Piston plates are respectively slidably connected in the two chambers. A piston rod is fixed at the front end of the piston plate. A first push groove with an opening facing right is formed on the piston rod on the left side, and a second push groove with an opening facing left and located in front of the first push groove is formed on the piston rod on the right side. A waist-shaped groove extending in the front-rear direction and with an opening facing forward is formed in the middle of the syringe barrel. A waist-shaped block is slidably connected in the waist-shaped groove. A cross bar extending in the left-right direction is slidably connected to the waist-shaped block. The left end of the cross bar can be inserted into the first push groove and the right end can be inserted into the second push groove. The rear ends of the two chambers are communicated with a three-way pipe. A needle is installed at the free end of the three-way pipe. Scale lines and scale values are distributed on the outer edge surfaces on both the left and right sides of the syringe barrel.

[0007] Compared with the prior art, the present utility model has the following beneficial effects:

[0008] 1. The structure of the utility model is ingenious and easy to use. It is provided with a syringe barrel with two chambers, a kidney-shaped block, a cross bar, and a guide groove. By simply pulling the pull rod forward, the left chamber can first extract 10 ml of blood, and then the right chamber can extract the required amount of blood for testing. There is no need to unpack the packaging bags of two syringes twice, and there is no need to repeatedly insert and remove the needle. The operation is simple and time-saving.

[0009] 2. An elastic sheet is provided to ensure that only the blood in the right chamber can be injected into the test tube, effectively preventing the blood extracted for the first time in the left chamber from being injected into the test tube, ensuring the quality of sampling, and being beneficial to the diagnosis and treatment of diseases. Description of the Drawings

[0010] Figure 1 is an axonometric view of the utility model.

[0011] Figure 2 is a full-section front view of the utility model.

[0012] Figure 3 is the utility model Figure 2 The sectional view taken along A - A in the utility model.

[0013] Figure 4 is the utility model Figure 2 The sectional view taken along B - B in the utility model.

[0014] Figure 5 is the sectional left view of the utility model.

[0015] Figure 6 is an axonometric view of the kidney-shaped block in the utility model.

[0016] Figure 7 is the top view of the utility model. Detailed Embodiment

[0017] The following further elaborates on the detailed embodiment of the utility model in conjunction with the drawings.

[0018] By Figures 1 to 7Provided is a syringe 2 including two chambers 1 with an opening facing forward. Piston plates 3 are slidably connected in the two chambers 1 respectively. A piston rod 4 is fixed to the front end of the piston plate 3. A first push groove 5 with an opening facing right is formed on the left piston rod 4, and a second push groove 6 located in front of the first push groove 5 and with an opening facing left is formed on the right piston rod 4. A waist-shaped groove 7 in the front-rear direction and with an opening facing forward is formed in the middle of the syringe 2. A waist-shaped block 8 is slidably connected in the waist-shaped groove 7. A cross bar 9 in the left-right direction is slidably connected to the waist-shaped block 8. The left end of the cross bar 9 can be inserted into the first push groove 5 and its right end can be inserted into the second push groove 6. A tee pipe 10 is connected to the rear ends of the two chambers 1. A needle is installed at the free end of the tee pipe 10. Scale lines and scale values are distributed on the outer edge surfaces on the left and right sides of the syringe 2.

[0019] In order to facilitate the sliding of the waist-shaped block 8 in the waist-shaped groove 7, a pull rod 11 with a front-large and rear-small T shape is fixed to the front end of the waist-shaped block 8, and the front end of the pull rod 11 extends out of the waist-shaped groove 7.

[0020] In order to enable the cross bar 9 to be slidably connected to the waist-shaped block 8, a through groove penetrating in the left-right direction is formed in the waist-shaped block 8, and the cross bar 9 is slidably connected to the through groove.

[0021] In order to enable the left end of the cross bar 9 to be inserted into the first push groove 5 and its right side to be inserted into the second push groove 6, the left and right sides of the waist-shaped groove 7 are respectively communicated with the corresponding chambers 1 through communication grooves 12. A transverse groove 13 with an opening facing downward and an upper side communicated with the through groove is formed in the waist-shaped block 8. A guiding groove is communicated with the lower side of the waist-shaped groove 7. The guiding groove includes a first straight groove 14 and a second straight groove 15. The second straight groove 15 is located in the right front of the first straight groove 14. The first straight groove 14 and the second straight groove 15 are communicated through an inclined groove 16. The left and right sides of the cross bar 9 respectively pass through the corresponding communication grooves 12 and a guide post 17 is fixed to the lower end thereof. The lower end of the guide post 17 is inserted into the guiding groove.

[0022] In order to achieve a better use effect, the length of the second straight groove 15 is greater than the length of the first straight groove 14, and the length of the first straight groove 14 is less than the distance between the rear side wall of the communication groove 12 and the rear side wall of the left chamber 1.

[0023] In order to prevent the blood in the left chamber 1 from being injected into the test tube and prevent the blood on the left from entering the right chamber 1, a relief groove is communicated with the left side of the intersection of the inclined groove 16 and the second straight groove 15. An elastic sheet 18 with an opening facing forward and a V shape is arranged in the relief groove. The free end of the elastic sheet 18 is inserted into the intersection of the inclined groove 16 and the second straight groove 15. A one-way valve 19 with an opening facing left is arranged in the left side of the tee pipe 10.

[0024] In order to facilitate the smooth sliding of the piston plate 3 in the chamber 1, a plurality of support rods 20 distributed along the circumferential direction of the piston rod 4 are fixed to the piston rod 4, and the free ends of the support rods 20 are attached to the inner wall of the chamber 1.

[0025] To protect the needle, a needle cap is detachably connected to the needle.

[0026] When the utility model is in use, it is arranged that the device is packaged with a disposable packaging bag. The rear side wall of the piston plate 3 contacts the rear side wall of the chamber 1. The left end of the cross bar 9 is inserted into the first push groove 5, that is, the initial state where the guide post 17 is located on the left side of the horizontal groove 13 and behind the first straight groove 14.

[0027] When it is necessary to take a sample from a patient with a central venous catheter before dialysis, open the disposable packaging bag, take out the syringe 2. The medical staff holds the syringe 2 with the left hand. After removing the needle cap and connecting the needle to the central venous catheter, the right hand pulls the pull rod 11 forward. The pull rod 11 drives the waist-shaped block 8 to move forward. The waist-shaped block 8 drives the cross bar 9. The left end of the cross bar 9 drives the left piston rod 4 to move forward. The guide post 17 moves forward in the first straight groove 14. At the same time, the left piston plate 3 also moves forward, increasing the pressure in its chamber 1. The one-way valve 19 opens, and blood enters the left chamber 1 through the needle and the left side of the three-way pipe 10. When the guide post 17 moves forward to the intersection of the first straight groove 14 and the inclined groove 16, as the pull rod 11 continues to move forward, the guide post 17 enters the inclined groove 16, causing the guide post 17 to drive the cross bar 9 to move to the right in the horizontal groove 13. When the left end of the cross bar 9 completely disengages from the first push groove 5, 10 ml of blood has been drawn into the left chamber 1.

[0028] Continue to pull the pull rod 11 forward. When the guide post 17 moves to the intersection of the inclined groove 16 and the second straight groove 15, the elastic piece 18 is squeezed. The right end of the cross bar 9 has entered the second push groove 6. The cross bar 9 drives the right piston rod 4 to move forward through the second push groove 6. At this time, the left piston rod 4 does not change. The elastic piece 18 resets, and the one-way valve 19 closes. The right piston plate 3 moves forward, increasing the pressure in its chamber 1. Blood enters the right chamber 1. Observe the scale value on the right side of the syringe 2. When the blood volume indicated by the scale value corresponding to the right piston plate 3 meets the sampling requirements, stop pulling the pull rod 11. After pulling out the needle and inserting it into the corresponding test tube, then push the pull rod 11 backward. The waist-shaped block 8 drives the cross bar 9 and the right piston rod 4 to move backward with the pull rod 11. Since the pressure in the test tube is less than the opening pressure of the one-way valve 19, the blood in the right chamber 1 enters the test tube and can be injected into different test tubes according to the inspection needs. When the guide post 17 moves to the intersection of the first straight groove 14 and the inclined groove 16, the blood in the right chamber 1 is completely injected into the test tube. Then push the pull rod 11 backward. Due to the blocking effect of the elastic piece 18, the pull rod 11 cannot move backward anymore, effectively preventing the blood in the left chamber 1 from entering the test tube and ensuring the quality of sampling. After sampling, just throw the syringe 2 into a dedicated medical trash can.

Claims

1. A dialysis sampler, comprising a syringe barrel (2) with an opening facing forward and two chambers (1), characterized in that, There are piston plates (3) slidably connected inside two chambers (1) respectively. A piston rod (4) is fixed to the front end of the piston plate (3). A first push groove (5) with an opening facing right is formed on the left piston rod (4), and a second push groove (6) which is located in front of the first push groove (5) and has an opening facing left is formed on the right piston rod (4). A waist-shaped groove (7) which extends in the front-rear direction and has an opening facing forward is formed in the middle of the syringe barrel (2). A waist-shaped block (8) is slidably connected inside the waist-shaped groove (7). A cross bar (9) in the left-right direction is slidably connected to the waist-shaped block (8). The left end of the cross bar (9) can be inserted into the first push groove (5) and its right end can be inserted into the second push groove (6). The rear ends of the two chambers (1) are communicated with a three-way pipe (10). A needle is installed at the free end of the three-way pipe (10). Scale lines and scale values are distributed on the outer peripheral surfaces on both the left and right sides of the syringe barrel (2).

2. The dialysis sampler according to claim 1, wherein A front-large-and-rear-small T-shaped pull rod (11) is fixed to the front end of the waist-shaped block (8), and the front end of the pull rod (11) extends out of the waist-shaped groove (7).

3. The dialysis sampler according to claim 1, wherein A through groove penetrating in the left-right direction is formed in the waist-shaped block (8), and the cross bar (9) is slidably connected with the through groove.

4. The dialysis sampler according to claim 1, characterized in that, The left and right sides of the waist-shaped groove (7) are respectively communicated with the corresponding chamber (1) through a communication groove (12). A transverse groove (13) with an opening facing downward and its upper side communicated with the through groove is formed in the waist-shaped block (8). A guide groove is communicated with the lower side of the waist-shaped groove (7). The guide groove includes a first straight groove (14) and a second straight groove (15). The second straight groove (15) is located at the right front of the first straight groove (14). The first straight groove (14) and the second straight groove (15) are communicated through an inclined groove (16). The left and right sides of the cross bar (9) respectively pass through the corresponding communication grooves (12) and a guide post (17) is fixed to the lower end thereof. The lower end of the guide post (17) is inserted into the guide groove.

5. The dialysis sampler according to claim 4, characterized in that, The length of the second straight groove (15) is greater than the length of the first straight groove (14), and the length of the first straight groove (14) is less than the distance between the rear side wall of the communication groove (12) and the rear side wall of the left chamber (1).

6. The dialysis sampler according to claim 4, characterized in that, A relief groove is communicated with the left side of the intersection of the inclined groove (16) and the second straight groove (15). An elastic sheet (18) which is V-shaped and has an opening facing forward is arranged in the relief groove. The free end of the elastic sheet (18) is inserted into the intersection of the inclined groove (16) and the second straight groove (15). A one-way valve (19) with an opening facing left is arranged inside the left side of the three-way pipe (10).

7. A dialysis sampler according to claim 1, characterized in that, A plurality of support rods (20) distributed along the circumferential direction thereof are fixed to the piston rod (4), and the free ends of the support rods (20) are in contact with the inner wall of the chamber (1).

8. A dialysis sampler according to claim 1, characterized in that, A needle cap is detachably connected to the needle.

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