CN110823674B

CN110823674B - Dilution system for blood sample preparation

Info

Publication number: CN110823674B
Application number: CN201911312376.5A
Authority: CN
Inventors: 杨蛟; 刘琳琳; 李志强; 沈坤园; 曾文雨
Original assignee: Second Affiliated Hospital Army Medical University
Current assignee: Second Affiliated Hospital Army Medical University
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2021-12-14
Anticipated expiration: 2039-12-18
Also published as: CN110823674A

Abstract

The invention relates to the field of blood sample dilution, in particular to a dilution system for blood sample preparation, which comprises a liquid storage barrel, a transfer barrel, a placing plate and a driving part, wherein a piston is vertically and slidably connected in the transfer barrel, a piston rod is connected on the piston, and a first rack is fixedly connected on the piston rod; a liquid inlet pipe is connected between the transfer barrel and the liquid storage barrel, a liquid outlet pipe is connected on the transfer barrel, a first one-way valve for enabling the diluent to flow from the liquid storage barrel to the transfer barrel in a one-way mode and a second one-way valve for enabling the diluent to flow from the transfer barrel in a one-way mode are respectively arranged on the liquid inlet pipe and the liquid outlet pipe, and an injection head is arranged at one end, far away from the transfer barrel, of the liquid outlet pipe; place fixedly connected with second rack on the board, the second rack includes a plurality of rack sections and a plurality of smooth section, and rack section and smooth section are mutual alternate distribution, and the meshing has the gear on the first rack, rack section intermittent type and gear engagement on the second rack. The scheme realizes automatic, quantitative and batch addition of the diluent into the blood sample.

Description

Dilution system for blood sample preparation

Technical Field

The invention relates to the field of blood sample dilution, in particular to a dilution system for manufacturing a blood sample.

Background

Blood contains various cells and biochemical components, and during the conventional detection process of blood, cell components, hemoglobin and the like in the blood are often required to be detected, and during the detection, the blood is required to be diluted by using a diluent to measure relevant information in the blood.

At present, blood is in the dilution process, often the manual diluent that adds to the test tube in the manual drip tube that uses of manual, can't realize adding the diluent to the test tube automatically to when manual diluent that adds to the test tube, the volume of diluent also is difficult to control, has great degree of difficulty to the ration adds the diluent. In addition, when a large number of blood samples need to be diluted, doctors need to dilute the blood samples one by one, a dropper needs to be operated repeatedly, the operation is complex, and the dilution by adding the diluent into the blood samples in batches cannot be realized at present.

Disclosure of Invention

The invention aims to provide a dilution system for preparing blood samples, which can automatically, quantitatively and massively add a diluent to the blood samples.

In order to achieve the purpose, the technical scheme of the invention is as follows: the diluting system for preparing the blood sample comprises a liquid storage barrel for containing a diluent, a transfer barrel, a placing plate for placing a plurality of test tubes and a driving part for driving the placing plate to move transversely, wherein a piston is vertically and slidably connected in the transfer barrel, a piston rod is connected onto the piston, a first rack is fixedly connected onto the piston rod, and a pulling part for enabling the piston rod to move downwards is arranged at one end, away from the piston, of the piston rod; a liquid inlet pipe is connected between the transfer barrel and the liquid storage barrel, a liquid outlet pipe is connected on the transfer barrel, a first one-way valve for enabling the diluent to flow from the liquid storage barrel to the transfer barrel in a one-way mode is arranged on the liquid inlet pipe, a second one-way valve for enabling the diluent to flow from the transfer barrel in a one-way mode is arranged on the liquid outlet pipe, and an injection head is arranged at one end, far away from the transfer barrel, of the liquid outlet pipe; the second rack is fixedly connected to the placing plate and comprises a plurality of rack sections and a plurality of smooth sections, the rack sections and the smooth sections are distributed in sequence and alternately along the length direction of the second rack, the first rack is meshed with a gear, and the rack sections on the second rack are intermittently meshed with the gear.

The working principle of the scheme is as follows: the liquid storage barrel is used for containing diluent. The pulling piece is used for pulling the piston rod to move downwards, when the piston moves downwards, negative pressure is generated in the transfer barrel, and diluent in the liquid storage barrel enters the transfer barrel through the liquid inlet pipe and the first one-way valve. The test tube placing device comprises a placing plate, a driving part, a placing head, a placing plate and a driving part, wherein the placing plate is used for placing a plurality of test tubes; meanwhile, the placing plate drives the second rack to move together, the second rack is in the moving process, the rack section can be intermittently meshed with the gear, when the rack section is meshed with the gear, the rack section drives the gear to rotate, the gear drives the first rack to move, the first rack drives the piston rod to move upwards, the piston rod pushes the piston to move, the piston pushes out the diluent in the transfer barrel through the liquid outlet pipe and the second one-way valve, the diluent flows out of the injection head, the test tube is just positioned below the injection head at the moment, the diluent flowing out of the injection head drops into the test tube, and therefore the diluent is automatically added into the test tube; after rack section and gear separation, the smooth section contact of gear and second rack, the gear can not blocked by the second rack, first rack is in pulling the effect of piece down-wards removal, first rack drives the piston and moves down, the piston inhales the transfer bucket once more with the diluent in the stock solution bucket, thereby realized that the diluent in the stock solution bucket is automatic to be mended in the transfer bucket, when treating next rack section and gear engagement, the rack section passes through the first rack of gear drive once more and moves, first rack passes through the piston rod once more and drives the piston rebound, thereby arrange the diluent in the transfer bucket into next test tube.

When adopting above-mentioned technical scheme, have following beneficial effect:

1. the board removal is placed in the driver part drive, not only has realized that a plurality of test tubes pass through the below of injection head in proper order, but also move through drive second rack, make the intermittent type nature meshing of rack section and gear on the second rack, thereby the automation of piston has been realized up, lower reciprocating motion, it inhales and discharges the transfer bucket is automatic with the diluent to have realized, when the test tube is in the below of injection head, the piston is in the state of rebound, the diluent can drip to the test tube automatically, the automation of having realized the diluent adds in the test tube, leave the injection head back when the test tube, the piston is in the state of rebound, can not drip the diluent downwards on the injection head, thereby avoided the diluent to last dripping and cause the waste continuously.

2. Vertical reciprocating motion through the piston in this scheme has realized inhaling the transfer bucket with the diluent in the stock solution bucket to discharge from the transfer bucket, the transfer bucket has played the effect that the diluent is transferred, because the volume of transfer bucket is certain, consequently inhales the volume of transfer bucket and follow transfer bucket exhaust diluent at every turn and is certain, thereby has realized the ration interpolation of diluent.

3. This scheme is placed and is equipped with a plurality of test tubes on the board, and the test tube is through each injection head in proper order, and the diluent is added in proper order to each test tube to the injection head to realized adding the diluent in a plurality of test tubes, realized that the batch of diluent adds the test tube in, the dilution of blood sample is efficient.

Further, still include the framework, place the vertical sliding connection of board in the framework, be connected with the elastic component of vertical setting between framework and the board of placing. From this, after placing a plurality of test tubes on placing the board, place the weight grow of board, place the board and can stimulate the elastic component, place the board and move down in the framework, place the board and drive the second rack and move down, can make the driver part drive place the board removal in-process like this, rack section on the second rack can with gear engagement. After all test tubes all dilute and finish, take off the test tube from placing the board, the weight of placing the board can become light, place the board rebound under the spring action of elastic component, it drives second rack rebound to place the board, then drive through driver part and place board reverse movement and reset, because the weight of placing the board this moment is lighter, so place the reverse return stroke in-process of board, rack section on the second rack can not with gear contact, thereby can avoid rack section to drive gear revolve, the gear drives first rack and removes, first rack drives the piston rod and reciprocates and makes the emergence of the condition that the transfer bucket inhales the diluent and discharges the diluent.

Furthermore, the transfer barrels are provided with a plurality of liquid outlet pipes which are connected with an injection head together, and valves are arranged on the liquid outlet pipes of the transfer barrels; the piston rods on the transfer barrels are detachably connected with connecting pieces. Can link together the piston rod of a plurality of transit buckets through the connecting piece, like this when first rack vertical migration, the piston rod at first rack place passes through the connecting piece and drives other a plurality of piston rods and remove, a plurality of piston rods drive a plurality of piston removals, thereby make a plurality of transit buckets can the simultaneous working, a plurality of transit buckets are simultaneously from inhaling the diluent in the stock solution bucket, a plurality of transit buckets also discharge the diluent simultaneously, because the drain pipe of a plurality of transit buckets is connected with an injection head jointly, so diluent accessible in a plurality of transit buckets is together discharged. From this, link together the piston rod at first rack place and the piston rod of other different quantity through the connecting piece to can realize the transfer bucket work of different quantity, and then realized that the volume of the diluent of discharging is different in the injection head, so can realize the regulation to the diluent addition through this scheme, can add the diluent of different volume in the blood sample of different batches.

Furthermore, place and be equipped with a plurality of on the board and place the hole, place and be equipped with the pilot lamp relative with placing the hole on the board, be equipped with the button that is used for controlling the pilot lamp switching on and off on the bottom of placing the hole. Thereby, the placing hole is used for placing the test tube. After adding the diluent in the test tube, the weight grow of test tube, the test tube extrudees the button to touch the button, the button control pilot lamp is opened, and the pilot lamp becomes bright, and whether the diluent has been added in the test tube that the medical staff of being convenient for from this knows the pilot lamp and corresponds.

Furthermore, the pulling part comprises a fixed block and a tension spring, and two ends of the tension spring are respectively and fixedly connected to one end of the piston rod, which is far away from the piston, and the fixed block. Therefore, when the gear drives the piston rod to move upwards through the first rack, the distance between the piston rod and the fixed block is lengthened, the piston rod pulls the tension spring, and therefore the tension spring stores power. When the gear is contacted with the smooth section on the second rack, the piston rod moves downwards under the action of the tension spring, so that the piston rod is pulled downwards.

Further, the pulling member includes a weight. Therefore, when the gear is in contact with the smooth section on the second rack, the piston rod can move downwards under the pulling of the weight due to the fact that the weight of the weight is large, the piston rod is pulled downwards, structures such as tension springs are not needed to be arranged, and the structure of the pulling piece is simple.

Further, the driving part includes a cylinder. Therefore, the air cylinder drives the placing plate to move, and the structure of the driving part is simpler.

Furthermore, the connecting piece is a connecting rod, and the connecting rod is detachably connected to the piston rod through a bolt. Therefore, the piston rod is connected with the connecting rod through the plug pin, and the connecting rod and the piston rod are connected and separated conveniently.

Furthermore, the injection head is needle-shaped, and one end of the injection head, which is far away from the liquid outlet pipe, is a sharp end. From this, acicular injection head's volume is less, can not occupy too big space to add the diluent through acicular injection head in to the test tube comparatively accurately and slowly, it is comparatively stable to add the diluent in to the test tube.

Further, the indicator light is provided with a number. From this, through setting up the serial number, be convenient for discern corresponding placing the hole, be convenient for place the test tube corresponding place the hole in.

Drawings

FIG. 1 is a front view of a dilution system for preparing a blood sample according to example 1;

FIG. 2 is a front cross-sectional view of the frame of FIG. 1;

FIG. 3 is a top view of the placement plate of FIG. 1;

FIG. 4 is a front view of the dilution system for preparing a blood sample according to example 2;

fig. 5 is a plan view of the placement plate in example 3.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the liquid storage barrel comprises a liquid storage barrel 1, a fixed block 2, a block 3, a tension spring 4, a piston rod 5, a gear 6, a frame 7, a liquid outlet pipe 8, an injection head 9, a second one-way valve 10, a piston 11, a first one-way valve 12, a transfer barrel 13, a liquid inlet pipe 14, a cylinder 15, a rack section 16, a placing plate 17, a spring 18, a second rack 19, a smooth section 20, a placing hole 21, a guide rail 22, a valve 23, a connecting rod 24, a button 25 and an indicator light 26.

Example 1

Substantially as shown in figures 1 to 3 of the accompanying drawings: blood sample preparation is with diluting system, including the frame, be used for the stock solution bucket 1 of splendid attire diluent, transfer bucket 13, be used for placing the board 17 of placing of a plurality of test tube and be used for the drive to place the drive part of board 17 lateral shifting, be equipped with the layer board that is used for placing stock solution bucket 1 in the frame, 1 vertical places of stock solution bucket on the layer board. The driving part in this embodiment is a cylinder 15 located on the left side of the liquid storage barrel 1, and the cylinder 15 is fixed on the frame through screws.

As shown in fig. 3, the system further includes a square frame 7, the frame 7 is connected to the rack in a transverse sliding manner, specifically, the rack is fixedly connected with a guide rail 22, two side surfaces of the frame 7 are provided with transverse grooves, and the guide rail 22 is located in the transverse grooves. As shown in fig. 2, the cylinder rod of the cylinder 15 is fixedly connected to the left end of the frame 7 by a screw. Place board 17 through vertical sliding connection in framework 7 of vertical groove and lug complex mode, the frame at the top of framework 7 with place and be connected with the elastic component of vertical setting between the board 17, the elastic component in this embodiment is spring 18. A second rack 19 is fixed on the bottom of the placing plate 17 through screws, a plurality of rack sections 16 and a plurality of smooth sections 20 are arranged on the bottom surface of the second rack 19, and the plurality of rack sections 16 and the plurality of smooth sections 20 are alternately distributed along the length direction of the second rack 19. The placing plate 17 is provided with a plurality of laterally distributed placing holes 21, and the placing holes 21 are located above the rack segments 16 and are opposite to the corresponding rack segments 16.

As shown in fig. 1, the middle rotating barrel 13 is fixed on the frame by screws and is positioned below the liquid storage barrel 1, the top of the middle rotating barrel 13 is closed, and the bottom is open. Vertical sealed sliding connection has piston 11 in the transit bucket 13, has piston rod 5 through screwed connection on the piston 11, and the welding has the first rack of vertical setting on the right flank of piston rod 5, and the meshing has gear 6 on the first rack, and gear 6 passes through the hub connection in the frame, and second rack 19 is located gear 6's top, and the rack section 16 interval on the second rack 19 meshes with gear 6. The bottom of piston rod 5 is equipped with and is used for making piston rod 5 move down draw the piece, draws in this embodiment to include extension spring 4 and the fixed block 2 of welding in the frame, and the bottom welding of piston rod 5 has block 3, and the both ends of extension spring 4 are fixed connection respectively on block 3 of piston rod 5 and fixed block 2. Of course, it is also simpler for the pulling element, such as a weight welded directly to the bottom end of the piston rod 5.

A liquid inlet pipe 14 is connected between the transfer barrel 13 and the liquid storage barrel 1, a liquid outlet pipe 8 is connected on the transfer barrel 13, a first one-way valve 12 for enabling the diluent to flow from the liquid storage barrel 1 to the transfer barrel 13 in a one-way mode and a second one-way valve 10 for enabling the diluent to flow from the transfer barrel 13 in a one-way mode are respectively arranged on the liquid inlet pipe 14 and the liquid outlet pipe 8, and an injection head 9 is arranged at one end, far away from the transfer barrel 13, of the liquid outlet pipe 8. The injection head 9 in this embodiment is an injection needle, the bottom end of the injection being pointed.

The specific implementation process is as follows: initially, the piston rod 5 is pulled downwards by the tension spring 4, the piston 11 is positioned at the bottom of the transfer barrel 13, negative pressure is generated in the transfer barrel 13, and diluent in the liquid storage barrel 1 enters the transfer barrel 13 through the liquid inlet pipe 14 and the first one-way valve 12.

When a plurality of test tubes are placed in the placing holes 21 on the placing plate 17, the weight of the placing plate 17 becomes large, the placing plate 17 moves downward along the frame body 7 under the action of gravity, the springs 18 are elongated, the springs 18 accumulate force, and the second rack 19 moves downward together with the placing plate 17 due to the downward movement of the placing plate 17, and the rack sections 16 on the second rack 19 can be meshed with the gears 6.

Starting the air cylinder 15, driving the frame body 7 to move rightwards by the air cylinder 15, driving the placing plate 17 to move rightwards by the frame body 7, driving the test tubes to move by the placing plate 17, and sequentially passing a plurality of test tubes below the injection head 9; meanwhile, the placing plate 17 drives the second rack 19 to move together, the second rack 19 is in the moving process, the rack section 16 can be intermittently meshed with the gear 6, when the rack section 16 is meshed with the gear 6, the rack section 16 drives the gear 6 to rotate clockwise, the gear 6 drives the first rack to move upwards, the first rack drives the piston rod 5 to move upwards, the piston rod 5 pushes the piston 11 to move upwards to a limit position, the piston 11 pushes diluent in the transit barrel 13 out through the liquid outlet pipe 8 and the second one-way valve 10, and the diluent flows out of the injection head 9. Since the test tube is located above the rack segment 16 and opposite to the rack segment 16, the test tube above the rack segment 16 engaged with the gear 6 is located just below the syringe 9, so that the diluent flowing out of the syringe 9 drops into the test tube, thereby achieving automatic addition of the diluent into the test tube. In addition, during the upward movement of the piston rod 5, the piston rod 5 causes the tension spring 4 to elongate, and the tension spring 4 stores power.

Along with the right movement of the placing plate 17, after the rack section 16 is separated from the gear 6, the gear 6 is contacted with the smooth section 20 of the second rack 19, at the moment, the gear 6 cannot be clamped by the second rack 19, the tension spring 4 pulls the piston rod 5 downwards, the piston rod 5 drives the first rack to move downwards, and the first rack drives the gear 6 to idle anticlockwise. In the downward movement process of the piston rod 5, the piston 11 sucks the diluent in the liquid storage barrel 1 into the transfer barrel 13 through the liquid inlet pipe 14 and the first one-way valve 12 again, so that the diluent in the liquid storage barrel 1 is automatically fed into the transfer barrel 13.

With the placing plate 17 moving rightwards, when the next rack segment 16 is meshed with the gear 6, the rack segment 16 drives the first rack to move upwards again through the gear 6, the first rack drives the piston 11 to move upwards again through the piston rod 5, so that the diluent in the rotating barrel 13 is discharged into the liquid outlet pipe 8, and the diluent entering the liquid outlet pipe 8 drops into the next test tube through the injection head 9. By parity of reasoning, the diluent is added into all the test tubes, and the diluent is automatically added in batches. Since the volume of the transit barrel 13 is fixed, the amount of the diluent entering the transit barrel 13 and discharged from the transit barrel 13 at a time is fixed, thereby realizing the quantitative addition of the diluent.

Example 2

The plurality of the transfer barrels 13 are provided, the liquid outlet pipes 8 of the plurality of the transfer barrels 13 are connected with an injection head 9 together, and the liquid outlet pipes 8 of the plurality of the transfer barrels 13 are provided with valves 23; the piston rods 5 on the plurality of middle rotating barrels 13 are detachably connected with a connecting piece. Specifically, in this embodiment, as shown in fig. 4, the number of the middle rotary drums 13 is two, and the piston 11, the piston rod 5, the liquid inlet pipe 14, the liquid outlet pipe 8, the first check valve 12, and the second check valve 10 on the left middle rotary drum 13 are arranged the same as the piston 11, the piston rod 5, the liquid inlet pipe 14, the liquid outlet pipe 8, the first check valve 12, and the second check valve 10 on the right middle rotary drum 13, and no further description is given here. It is worth to be noted that the liquid outlet pipe 8 on the left-side middle rotating barrel 13 is communicated with the liquid outlet pipe 8 on the right side, and the valve 23 is arranged on the liquid outlet pipe 8 on the left side. In this embodiment, a connecting member is detachably connected between the piston rod 5 on the left side and the piston rod 5 on the right side, specifically, the connecting member is a connecting rod 24, and the connecting rod 24 is detachably connected to the two piston rods 5 through a latch.

Therefore, when only the right-side middle rotary barrel 13 works, the valve 23 is closed, and the connecting rod 24 between the two piston rods 5 is taken down, so that when the gear 6 rotates, the gear 6 can only drive the right-side piston rod 5 to move through the first rack, and the right-side middle rotary barrel 13 works.

When it is desired to increase the amount of diluent added to the test tube each time, valve 23 is opened and link 24 is caused to connect the two piston rods 5 together. When the first rack drives the right piston rod 5 to move, the right piston rod 5 drives the left piston rod 5 to move together through the connecting rod 24, so that the left piston rod 5 can vertically drive the piston 11 to move, and the left transfer barrel 13 can work. Thus, when the two piston rods 5 move downwards, the two transfer drums 13 suck the diluent from the liquid storage barrel 1. When the two piston rods 5 move upwards, the diluent in the two middle rotating barrels 13 is gathered into the injection head 9 through the two liquid outlet pipes 8, and flows into the test tube from the injection head 9. From this, realized increasing the volume of the diluent that adds in to the test tube by one time through this scheme, realized the change of the volume of diluent.

Example 3

Referring to fig. 5, the placing plate 17 in the present embodiment is provided with an indicator lamp 26 opposite to the placing hole 21, the bottom of the placing hole 21 is provided with a button 25 for controlling the opening and closing of the indicator lamp 26, the placing plate 17 is provided with a power supply connected in parallel with each indicator lamp 26, and the button 25 is respectively located on a circuit branch where each indicator lamp 26 is located. The indicator light 26 is provided with a number. Thus, when no diluent is added to the tube, the tube is light in weight and does not trigger the button 25. After adding the diluent in the test tube, the weight grow of test tube, the test tube squeezes button 25 to touch button 25, button 25 control pilot lamp 26 is opened, and pilot lamp 26 becomes bright, has added the diluent in the test tube that the medical staff of being convenient for from this knows that pilot lamp 26 corresponds. Through setting up the serial number, be convenient for discern corresponding hole 21 of placing, be convenient for place the test tube corresponding place in the hole 21.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various changes and modifications without departing from the concept of the present invention, and these should be construed as the scope of protection of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent. The techniques, shapes, and structural parts, which are omitted from the description of the present invention, are all known techniques.

Claims

1. Dilution system is used in blood sample preparation which characterized in that: the test tube test device comprises a liquid storage barrel for containing diluent, a transfer barrel, a placing plate for placing a plurality of test tubes and a driving component for driving the placing plate to move transversely, wherein a piston is vertically and slidably connected in the transfer barrel, a piston rod is connected onto the piston, a first rack is fixedly connected onto the piston rod, and a pulling part for enabling the piston rod to move downwards is arranged at one end, far away from the piston, of the piston rod; a liquid inlet pipe is connected between the transfer barrel and the liquid storage barrel, a liquid outlet pipe is connected on the transfer barrel, a first one-way valve used for enabling the diluent to flow from the liquid storage barrel to the transfer barrel in a one-way mode is arranged on the liquid inlet pipe, a second one-way valve used for enabling the diluent to flow from the transfer barrel in a one-way mode is arranged on the liquid outlet pipe, and an injection head is arranged at one end, far away from the transfer barrel, of the liquid outlet pipe; the placing plate is fixedly connected with a second rack, the second rack comprises a plurality of rack sections and a plurality of smooth sections, the rack sections and the smooth sections are sequentially and alternately distributed along the length direction of the second rack, the first rack is meshed with a gear, and the rack sections on the second rack are intermittently meshed with the gear.

2. The dilution system for preparing a blood sample according to claim 1, wherein: the frame body is further included, the placing plates are vertically connected in the frame body in a sliding mode, and vertically arranged elastic pieces are connected between the frame body and the placing plates.

3. The dilution system for preparing a blood sample according to claim 1, wherein: the liquid outlet pipes of the plurality of transfer barrels are connected with an injection head together, and valves are arranged on the liquid outlet pipes of the plurality of transfer barrels; the piston rods on the transfer barrels are detachably connected with connecting pieces.

4. The dilution system for preparing a blood sample according to claim 1, wherein: the placing plate is provided with a plurality of placing holes, the placing plate is provided with indicating lamps opposite to the placing holes, and the bottom of the placing holes are provided with buttons for controlling the indicating lamps to be turned on and off.

5. The dilution system for preparing a blood sample according to any one of claims 1 to 4, wherein: the pulling piece comprises a fixed block and a tension spring, and two ends of the tension spring are respectively and fixedly connected to one end of the piston rod, which is far away from the piston, and the fixed block.

6. The dilution system for preparing a blood sample according to any one of claims 1 to 4, wherein: the pulling member comprises a weight.

7. The dilution system for preparing a blood sample according to any one of claims 1 to 4, wherein: the driving part includes a cylinder.

8. The dilution system for preparing a blood sample according to claim 3, wherein: the connecting piece is a connecting rod, and the connecting rod is detachably connected to the piston rod through a bolt.

9. The dilution system for preparing a blood sample according to any one of claims 1 to 4, wherein: the injection head is needle-shaped, and one end of the injection head, which is far away from the liquid outlet pipe, is a sharp end.

10. The dilution system for preparing a blood sample according to claim 4, wherein: and the indicator light is provided with a number.