Free quantitative bone cement monomer dispenser and use method thereof

Abstract

The invention discloses a free quantitative bone cement monomer distributor and a using method thereof.The free quantitative bone cement monomer distributor comprises a connecting body, a breaking assembly provided with an ampoule bottle and a distributing body are arranged at the upper end and the lower end of the connecting body in a sealed mode respectively, filter cloth is arranged between the breaking assembly and a liquid collecting hole, and four liquid collecting holes are formed in the distributing body; pistons are movably arranged in the liquid collecting holes in a sealed mode, when the four pistons descend in place, the total volume of inner cavities of the four liquid collecting holes is matched with the volume of a single bone cement body in an ampoule bottle, liquid outlet holes are formed in the pistons, liquid outlet pipes are arranged on the liquid outlet holes in a downward extending mode, piston rods are clamped on the pistons, and the piston rods extend out of the liquid collecting holes downwards. The liquid outlet pipe extends out of the piston rod downwards and then is connected with a one-way Luer connector, and a balance seat is arranged on the distribution body. The bone cement distribution device is simple in structure and convenient to operate, and bone cement monomers in the ampoule bottle can be freely distributed or equally distributed according to different use requirements.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to a free quantitative bone cement monomer dispenser and a use method thereof. Background Art

[0002] Bone cement is a medical material used in orthopedic surgery. It is composed of bone cement monomers and bone cement powder. After the two are mixed in a certain proportion, they can be injected into the patient's affected area in a liquid state for solidification. Since the mixing reaction time between bone cement monomers and bone cement powder is relatively long, but the storage time of the bone cement formed after mixing is relatively short, if the bone cement monomers and bone cement powder in the ampoule are mixed into bone cement at one time, due to the long reaction time, they need to be prepared before the operation, and then the doctor needs to give the patient a one-time injection. However, in actual operation, each patient's condition is different, and different patients need to be treated at different times during the operation. Performing additional treatment work during the operation will interrupt the injection process, which can easily cause the bone cement to solidify and cause waste. In order to prevent the waste of bone cement monomer in the ampoule bottle, a negative pressure dispenser with the publication number of CN118615159A is disclosed on the market, which can perform high-precision packaging of bone cement monomer. When dividing the bone cement monomer into equal parts, it is necessary to pull the broken filter assembly upward to drive the piston sleeve to move upward, and the bone cement monomer in the piston sleeve flows into the divider through negative pressure. Then, the piston sleeve is pressed downward to pressurize the bone cement monomer in the divider before it can be equally divided into four collecting tubes. Then, when the bone cement monomer in the collecting tube needs to be extracted, the piston rod in the syringe tube needs to be pressed to extract the bone cement monomer. Extraction can only be carried out after the negative pressure environment in the liquid hose is destroyed. The structure is complex and the operation is cumbersome. In this way, the bone cement monomer can be extracted in batches, reducing the amount of bone cement monomer and bone cement powder to shorten the reaction time. In the preoperative preparation stage, the bone cement monomer in a collection tube is extracted and mixed and placed aside waiting for use. When additional disposal work is required during the injection process, since the bone cement monomer in other collection tubes is not mixed with the bone cement powder, there will be no waste. After the additional disposal work is completed, the bone cement monomer in other collection tubes can be extracted and mixed before injection. However, after the bone cement monomer is divided into equal parts, the reaction time between the amount of each portion of bone cement monomer and the bone cement powder is much shorter than the preoperative preparation time, but it is relatively long compared to the injection time required by the doctor during the operation. Therefore, it is generally mixed and reserved in the latter part of the preoperative preparation stage. However, when the patient's condition is complicated and the affected area is unstable, the doctor cannot control the treatment time well, which makes it easy for the bone cement reserved in advance to solidify and cause waste. After the reserved bone cement solidifies, there is not enough time to mix and react with the bone cement monomer in the second collection tube, which affects the treatment effect. Therefore, the publication number is: CN118615159A. The negative pressure dispenser that can perform high-precision packaging of bone cement monomer is generally used in operations with simple patient conditions and uncomplicated treatment.In addition, the negative pressure dispenser disclosed in the publication number CN118615159A, which can perform high-precision packaging of bone cement monomers, can only be made into a structure for equally dividing the bone cement monomers, and cannot be made into a structure for free quantitative distribution. If free quantitative distribution is to be achieved, the inner cavity volumes of the four collecting tubes need to be set to be different. However, when the inner cavity volumes of the four collecting tubes are different, the pressure generated when the piston sleeve is pressed down is uneven, which will cause the piston sleeve to tilt. A gap will easily appear between the piston sleeve and the rubber plug, resulting in air leakage, and the bone cement monomers in the dispenser cannot be distributed cleanly. Summary of the invention

[0003] The purpose of the present invention is to provide a free quantitative bone cement monomer dispenser with simple structure and easy operation and a use method thereof.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a free quantitative bone cement monomer distributor, comprising: a connecting body, a liquid collecting hole and a connecting groove are respectively arranged at the upper and lower ends of the connecting body, a breaking assembly with an ampoule bottle installed is sealed in the liquid collecting hole, a filter cloth is arranged between the breaking assembly and the liquid collecting hole, a distribution body is sealed in the connecting groove, four liquid collecting holes are arranged in the distribution body, the four liquid collecting holes are all connected to the liquid collecting hole, a piston is movably sealed in the liquid collecting hole, and when the pistons in the four liquid collecting holes are lowered into place, the four collecting holes are The total volume of the inner cavity of the liquid hole matches the volume of the bone cement monomer in the ampoule bottle. Four numbers are engraved on the distribution body, each number corresponds to a liquid collecting hole and represents the inner cavity volume of the liquid collecting hole. A liquid outlet hole is arranged on the piston, and a liquid outlet tube is arranged extending downward from the liquid outlet hole. A piston rod is clamped on the piston, the piston rod extends downward from the liquid collecting hole, and the liquid outlet tube extends downward from the piston rod. A one-way Luer joint is arranged on the liquid outlet tube, and the flow direction of the one-way Luer joint is to flow from the outside to the liquid outlet tube. A balancing seat is arranged on the distribution body.

[0005] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, the liquid collection hole includes a cylindrical section and an inverted cone section, the large diameter end of the inverted cone section is connected to the cylindrical section, the small diameter end of the inverted cone section is connected to the connecting groove, a step is provided at the transition between the inverted cone section and the cylindrical section, the filter cloth is laid on the step, and the breaking assembly sealing card is arranged in the cylindrical section and presses the filter cloth against the step.

[0006] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, the filter cloth is medical gauze with a thickness of 0.2 mm.

[0007] Furthermore, in the aforementioned free quantitative bone cement monomer distributor, a guide platform is provided in the middle of the distribution body to protrude upward, the central axis of the guide platform is coaxial with the central axis of the liquid collecting hole, four guide surfaces are provided on the guide platform, the four guide surfaces are respectively connected to the four liquid collecting holes one by one, and a circulation groove is left between the guide platform and the liquid collecting hole.

[0008] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, an inner limit platform is provided at the bottom of the liquid collecting hole, and a plurality of guide ribs are evenly distributed on the circumference of the outer wall of the piston rod, and the guide ribs abut against the inner limit platform.

[0009] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, the balance seat is small at the top and large at the bottom, and four dividing grooves are evenly distributed on the circumference of the balance seat, and the piston rods in the four liquid collecting holes are respectively located in the four dividing grooves.

[0010] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, the inner cavity volumes of the four liquid collecting holes are the same.

[0011] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, the inner cavity volumes of the four liquid collecting tubes are all different.

[0012] The method for using the free quantitative bone cement monomer dispenser comprises the following specific steps:

[0013] S1. First, use the breaking assembly to break the ampoule bottle, and the bone cement monomer in the ampoule bottle will flow into the liquid collection hole under its own weight;

[0014] S2, pull the piston rod to drive the piston to move downward, the suction force generated by the piston movement sucks the bone cement monomer in the liquid collecting hole into the liquid collecting hole, when the piston is lowered into place, the liquid collecting hole is filled with bone cement monomer, and then all the liquid collecting holes are filled in turn;

[0015] S3. When it is necessary to use a stirring syringe to extract bone cement monomer, the stirring syringe can be directly inserted into the one-way Luer connector to extract.

[0016] The advantages of the present invention are: the overall structure is simple and the operation is convenient. The free quantitative bone cement monomer distributor of the present invention can be designed into two series of equal division structure and unequal division structure to adapt to different usage conditions. If the inner cavity volumes of the four liquid collecting holes are the same, and after the pistons in the four liquid collecting holes are lowered into place, the total inner cavity volume of the four liquid collecting holes is matched with the volume of the bone cement monomer in the ampoule bottle, the bone cement monomer in the ampoule bottle can be equally divided. If the inner cavity volumes of the four liquid collecting holes are different, and after the pistons in the four liquid collecting holes are lowered into place, the total inner cavity volume of the four liquid collecting holes is matched with the volume of the bone cement monomer in the ampoule bottle, the bone cement monomer in the ampoule bottle can be equally divided. The bone cement in the ampoule is quantitatively distributed. After the ampoule in the breaking assembly is broken, the bone cement monomer will enter the liquid collecting hole after being filtered by the filter cloth under its own weight, and then contact the four liquid collecting holes. After the pistons in the four liquid collecting holes are pulled down to the right position, the bone cement monomer can be distributed to the four liquid collecting holes. When the bone cement monomer is extracted, the stirring syringe can be directly inserted into the one-way Luer joint for extraction. The whole process is carried out under normal pressure, and there is no need for complicated operations such as negative pressure and pressurization to perform equal division and extraction like the negative pressure dispenser with publication number: CN118615159A that can perform high-precision packaging of bone cement monomer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the first embodiment of the free quantitative bone cement monomer dispenser described in the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the explosion structure.

[0019] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure.

[0020] Figure 4 yes Figure 1 Schematic diagram of the structure in which the connector is connected to the distributor.

[0021] Figure 5 yes Figure 1 Schematic diagram of the cross-sectional structure of the connector.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the second embodiment of the free quantitative bone cement monomer dispenser of the present invention.

[0023] Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0025] like Figure 1 to Figure 7 As shown, the free quantitative bone cement monomer distributor of the present invention comprises: a connector 1, wherein a liquid collecting hole 11 and a connecting groove 12 are respectively arranged at the upper and lower ends of the connector 1, wherein the liquid collecting hole 11 comprises a cylindrical section 111 and an inverted cone section 112, wherein the large diameter end of the inverted cone section 112 is connected to the cylindrical section 111, and the small diameter end of the inverted cone section 112 is connected to the connecting groove 12, and a step is arranged at the transition between the inverted cone section 112 and the cylindrical section 112, and a filter cloth 2 is laid on the step, wherein the filter cloth 2 separates the cylindrical section 11 and the inverted cone section 112, and the filter cloth 2 is cut from medical gauze with a thickness of 0.2 mm, and is convenient to produce and has high quality. The invention has the advantages of low cost, a breaking component 4 with an ampoule bottle 3 built in is sealed in the cylindrical section 111 of the liquid collecting hole 11, and the breaking component 4 is pressed against the step to press the filter cloth 2. The breaking component 4 in this embodiment is similar to the breaking filter component in the negative pressure distributor capable of high-precision packaging of bone cement monomers with publication number: CN118615159A. The breaking component 4 comprises: a lower sleeve 41, a rotating sleeve 42 and an upper sleeve 43. The lower sleeve 41 is sealingly inserted in the cylindrical section 111 of the liquid collecting hole 11 and is pressed against the step to press the filter cloth 2. The bottom of the rotating sleeve 42 is connected to the top of the lower sleeve 41. The top of the sleeve 42 is provided with a mounting hole, the bottom of the upper sleeve 43 is connected to the top of the rotating sleeve 42, the upper sleeve 43 is connected to the mounting hole of the rotating sleeve 42, and a rotary cover 421 is rotatably provided at both ends of the rotating sleeve 42, and the rotary cover 421 is sealed and connected to the rotating sleeve 42 through a sealing ring, and a knob 422 is provided between the two rotary covers 421, and a straight through hole 423 aligned with the mounting hole is opened in the knob 422, and a sealing tail cap 431 is threadedly connected to the top of the upper sleeve 43. When installing the ampoule bottle 3, the sealing tail cap 431 is unscrewed, and the rotary cover 421 is rotated to align the straight through hole 423 on the knob 422 with the mounting hole, and then Then, the bottle head of the ampoule bottle 3 is inserted into the upper sleeve 43 with the bottle head facing downward, and the bottle head of the ampoule bottle 3 passes through the mounting hole of the rotating sleeve 42 and extends into the straight hole 423, and then the sealing tail cap 431 is screwed on the upper sleeve 43 again. At this time, the bottle bottom of the ampoule bottle 3 abuts against the sealing tail cap 431, and the bottleneck of the ampoule bottle 3 abuts against the mounting hole. When the ampoule bottle 3 needs to be broken, it is only necessary to rotate the rotary cover 421, and the knob 422 will break the bottleneck of the ampoule bottle 3, so that the broken part of the bottle head of the ampoule bottle 3 is tilted downward, and the bone cement monomer in the bottle body and the bottle head of the ampoule bottle 3 will flow into the inverted cone section 112 of the liquid collecting hole 11 through the filter cloth 2.

[0026] A distribution body 5 is sealed in the connecting groove 12, and four liquid collecting holes 51 are arranged in the distribution body 5. The four liquid collecting holes 51 are all connected with the liquid collecting hole 11. A piston 52 is movably sealed in the liquid collecting hole 51. When the four pistons 52 are lowered into place, the total volume of the inner cavity of the four liquid collecting holes 51 matches the volume of the bone cement monomer in the ampoule bottle 3. The bone cement monomer in the ampoule bottle 3 can fill the four liquid collecting holes 51. Four numbers are engraved on the distribution body 5, each number corresponds to a liquid collecting hole 51 and represents the inner cavity volume of the liquid collecting hole 51. A liquid outlet is arranged on the piston 52. A liquid outlet pipe 53 with an inner diameter of 1.5 to 2 mm is provided downwardly extending from the liquid outlet hole, a piston rod 54 is clamped on the piston 52, the piston rod 54 extends downwardly from the liquid collecting hole 51, the liquid outlet pipe 53 extends downwardly from the piston rod 54, a one-way Luer joint 55 is provided on the liquid outlet pipe 53, and the flow direction of the one-way Luer joint 55 flows from the outside to the liquid outlet pipe 53, an inner limit platform 511 is provided at the bottom of the liquid collecting hole 51, when the piston rod 54 drives the piston 52 to move downwardly and abut against the inner limit platform 511, it means that the piston 52 has fallen into place, and the outer wall of the piston rod 54 is A plurality of guide ribs 541 are evenly distributed on the circumference, and the guide ribs 541 are against the inner limit platform 511. The guide ribs 541 not only improve the strength of the piston rod 54, but also play a role in stabilizing the guide. A guide platform 56 is provided in the middle of the distribution body 5, which protrudes upward. The central axis of the guide platform 56 is coaxial with the central axis of the liquid collecting hole 11. Four guide surfaces are provided on the guide platform 56, and the four guide surfaces are connected to the four liquid collecting holes 51. A circulation groove 561 is left between the guide platform 56 and the liquid collecting hole 11. The provision of the guide platform 56 can prevent the bone cement monomer from remaining in the distribution body 5, which may cause the inability to completely The bone cement monomer flows into the four liquid collecting holes 51, and a circulation groove 561 is left between the guide platform 56 and the liquid collecting hole 11 to enable the bone cement monomer to circulate in the distribution body 5. When one liquid collecting hole 51 is full of bone cement monomer, the excess bone cement monomer at the liquid collecting hole 51 can flow into another liquid collecting hole 51 through the circulation groove 561. A balance seat 6 is arranged on the distribution body 5. The balance seat 6 is small at the top and large at the bottom, so as to improve the stability of the balance seat 6 when it is placed. Four separation grooves 61 are evenly distributed on the circumference of the balance seat 6, and the four piston rods 54 are respectively located in the four separation grooves 61.

[0027] Here’s how to use it:

[0028] S1. First, the ampoule bottle 3 is broken off with the breaking assembly 4. The bone cement monomer in the ampoule bottle 3 will flow into the inverted conical section 112 of the liquid collecting hole 11 after being filtered by the filter cloth 2 under its own weight, and then flow into the four liquid collecting holes 51. Since the liquid outlet pipe 53 on the piston 52 in the liquid collecting hole 51 is blocked by the one-way Luer connector 55, and the inner diameter of the liquid outlet pipe 53 is only 1.5-2 mm, the bone cement monomer in the liquid collecting hole 51 will not enter the liquid outlet pipe 53 blocked by the one-way Luer connector 55 under the action of surface tension, and will not flow out;

[0029] S2, then pull the piston rod 54 to drive the piston 52 to move downward, and the suction force generated by the movement of the piston 52 sucks the bone cement monomer in the liquid collecting hole 11 into the liquid collecting hole 51. When the piston 52 is lowered into place, the liquid collecting hole 51 is filled with bone cement monomer, and then all the liquid collecting holes 51 are filled in turn;

[0030] S3. When it is necessary to use a stirring syringe to extract bone cement monomer, the stirring syringe can be inserted into the one-way Luer connector 55 to directly extract the monomer.

[0031] Embodiment 1

[0032] The inner volumes of the four collecting holes 51 are the same. When the pistons 52 in the four collecting holes 51 are lowered into place, the inner volumes of the four collecting holes 51 are still the same, and the total volume of the four collecting holes 51 matches the volume of the bone cement monomer in the ampoule bottle 3. The four collecting holes 51 can divide the bone cement monomer in the ampoule bottle 3 into equal parts. In this embodiment, taking the volume of the bone cement monomer in the ampoule bottle 3 as 10ML as an example, when the inner volumes of the four collecting holes 51 are the same, it means that the inner volumes of the four collecting holes 51 after the pistons 52 are lowered into place are all 2.5cm 3 The four collecting holes 51 can evenly divide the bone cement monomer in the ampoule bottle 3. The amount of bone cement monomer in each collecting hole 51 is 2.5ML, and four "2.5" are engraved on the dispensing body 5. Each "2.5" corresponds to a collecting hole 51, indicating that the inner cavity volume of the collecting hole 51 is 2.5cm 3 .

[0033] Embodiment 2

[0034] The inner volumes of the four collecting holes 51 are different. When the pistons 52 in the four collecting holes 51 are lowered into place, the inner volumes of the four collecting holes 51 are different. However, the total volume of the four collecting holes 51 matches the volume of the bone cement monomer in the ampoule bottle 3. The four collecting holes 51 can also distribute the bone cement monomer in the ampoule bottle 3. In this embodiment, the volume of the bone cement monomer in the ampoule bottle 3 is 10ML as an example, and the inner volumes of the four collecting holes 51 after the pistons 52 in the four collecting holes 51 are lowered into place are 1cm 3, 2cm 3 , 3cm 3 , 4cm 3 The four collecting holes 51 can also distribute the bone cement in the ampoule bottle 3. The amount of bone cement monomer in the four collecting holes 51 is 1ML, 2ML, 3ML, and 4ML respectively, and four numbers "1", "2", "3", and "4" are engraved on the distributing body 5, and each number corresponds to a collecting hole 51, thereby showing the inner cavity volume of the collecting hole 51. By setting the inner limiting platforms 511 of different heights in the four collecting holes 51, the collecting holes 51 with different inner cavity volumes can be obtained, and the pistons 52 in the collecting holes 51 can be limited.

[0035] It can be seen from Example 1 and Example 2 that when the free quantitative bone cement monomer dispenser described in the present invention is designed into two series of equal-division structure and unequal-division structure, the doctor can choose a certain series according to the actual use requirements, thereby improving the application scope of the free quantitative bone cement monomer dispenser described in the present invention. When encountering a surgical procedure with a complicated patient condition and unstable affected area, the unequal-division structure can be selected. Before the operation, there is no need to mix the bone cement monomer with the bone cement powder in advance. In this way, during the operation, no matter how long the doctor treats it, the bone cement will not solidify. When injection is required, the bone cement monomer in the liquid collection hole 51 with the smallest inner cavity volume is first mixed with the bone cement powder to improve the mixing reaction efficiency, so that a small volume of bone cement monomer and bone cement powder can be mixed with a relatively small volume of bone cement monomer. After the bone cement is formed by mixing and reacting at a fast speed, it is quickly injected. During this process, the bone cement monomers and bone cement powders in the other three collecting holes 51 are mixed in turn. After the bone cement mixed with the bone cement monomers in the collecting hole 51 with the smallest inner cavity volume is injected, the bone cement monomers and bone cement powders in the second smallest collecting hole 51 in the inner cavity are also mixed and reacted, and the injection can be continued. When the bone cement mixed with the bone cement monomers in the second smallest collecting hole 51 in the inner cavity is injected, the bone cement monomers and bone cement powders in the third smallest collecting hole 51 in the inner cavity are also mixed and reacted, and the injection can be continued. Finally, the bone cement mixed with the bone cement monomers and bone cement powder in the largest collecting hole 51 in the inner cavity is continued to be injected. In this way, orderly connection can be carried out to achieve continuous injection. When the patient's condition is simple and the surgery is not complicated, the equal-division structure is selected. Based on the preoperative preparation time and the approximate treatment time during the operation, the equal-division bone cement monomer and bone cement powder are mixed before the operation. When each treatment work is almost completed, the equal-division bone cement monomer and bone cement powder are mixed and reacted and then injected.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. Free quantitative bone cement monomer dispenser, including: The connector is characterized in that: a liquid collecting hole and a connecting groove are respectively arranged at the upper and lower ends of the connector, a breaking assembly on which an ampoule bottle is installed is sealed in the liquid collecting hole, a filter cloth is arranged between the breaking assembly and the liquid collecting hole, a distribution body is sealed in the connecting groove, four liquid collecting holes are arranged in the distribution body, the four liquid collecting holes are all connected to the liquid collecting hole, a piston is movably sealed in the liquid collecting hole, and when the pistons in the four liquid collecting holes are lowered into place, the total volume of the inner cavity of the four liquid collecting holes is equal to the bone volume in the ampoule bottle. The volume of the cement monomer is matched, and four numbers are engraved on the distribution body, each number corresponds to a liquid collecting hole and represents the inner cavity volume of the liquid collecting hole. A liquid outlet hole is arranged on the piston, and a liquid outlet pipe is arranged downwardly extending from the liquid outlet hole. A piston rod is clamped on the piston, and the piston rod extends downward from the liquid collecting hole. The liquid outlet pipe extends downward from the piston rod. A one-way Luer joint is arranged on the liquid outlet pipe, and the flow direction of the one-way Luer joint is from the outside to the liquid outlet pipe. A balancing seat is arranged on the distribution body.

2. The free quantitative bone cement monomer dispenser according to claim 1, characterized in that: The liquid collecting hole includes a cylindrical section and an inverted cone section. The large diameter end of the inverted cone section is connected to the cylindrical section, and the small diameter end of the inverted cone section is connected to the connecting groove. A step is provided at the transition between the inverted cone section and the cylindrical section. The filter cloth is laid on the step. The breaking assembly sealing card is arranged in the cylindrical section and presses the filter cloth against the step.

3. The free quantitative bone cement monomer dispenser according to claim 1 or 2, characterized in that: The filter cloth is medical gauze with a thickness of 0.2 mm.

4. The free quantitative bone cement monomer dispenser according to claim 1, characterized in that: A flow guide platform is protruding upward in the middle of the distribution body. The central axis of the flow guide platform is coaxial with the central axis of the liquid collecting hole. Four flow guide surfaces are arranged on the flow guide platform. The four flow guide surfaces are connected to the four liquid collecting holes one by one respectively. A circulation groove is left between the flow guide platform and the liquid collecting hole.

5. The free quantitative bone cement monomer dispenser according to claim 1, characterized in that: An inner limit platform is arranged at the bottom of the liquid collecting hole, and a plurality of guide ribs are evenly distributed on the circumference of the outer wall of the piston rod, and the guide ribs are against the inner limit platform.

6. The free quantitative bone cement monomer dispenser according to claim 1, characterized in that: The balancing seat is small at the top and large at the bottom. Four dividing grooves are evenly distributed on the circumference of the balancing seat. The piston rods in the four liquid collecting holes are respectively located in the four dividing grooves.

7. The free quantitative bone cement monomer dispenser according to claim 1, characterized in that: The inner volumes of the four liquid collecting holes are the same.

8. The free quantitative bone cement monomer dispenser according to claim 1, characterized in that: The inner cavity volumes of the four collecting tubes are all different.

9. A method for using the free quantitative bone cement monomer dispenser according to any one of claims 1 to 8, characterized in that: The specific steps are as follows: S1. First, use the breaking assembly to break the ampoule bottle, and the bone cement monomer in the ampoule bottle will flow into the liquid collection hole under its own weight; S2, pull the piston rod to drive the piston to move downward, the suction force generated by the piston movement sucks the bone cement monomer in the liquid collecting hole into the liquid collecting hole, when the piston is lowered into place, the liquid collecting hole is filled with bone cement monomer, and then all the liquid collecting holes are filled in turn; S3. When it is necessary to use a stirring syringe to extract bone cement monomer, the stirring syringe can be directly inserted into the one-way Luer connector to extract.

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