Free quantitative bone cement monomer distributor

Abstract

The utility model discloses a free quantitative bone cement single body distributor which 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] This utility model relates to the field of medical devices, and in particular to a free-quantitative bone cement monomer dispenser. Background Technology

[0002] Bone cement is a medical material used in orthopedic surgery. It consists of bone cement monomers and bone cement powder, which are mixed in a certain proportion and then injected into the patient's affected area in a liquid state to solidify. Because the mixing reaction time between the bone cement monomers and bone cement powder is relatively long, the storage time of the resulting bone cement is also relatively short. If the bone cement monomers and bone cement powder in the ampoule are mixed into bone cement in one go, the reaction time is long, so it needs to be prepared before surgery and then injected into the patient in one go by the doctor. However, in actual operation, each patient's condition is different, and different patients need to be treated at different times during the operation. Additional treatments during the operation will interrupt the injection process, which can easily cause the bone cement to solidify and result in waste. To prevent waste of bone cement monomers in ampoules, a negative pressure dispenser with publication number CN118615159A has been commercially available. This dispenser allows for high-precision dispensing of bone cement monomers. When dispensing the monomers, pulling upwards to break the filter assembly moves the piston sleeve upwards, creating negative pressure that draws the monomers into the dispenser. Pressing down on the piston sleeve then pressurizes the monomers in the dispenser, dispensing them into four collection tubes. To extract the monomers from the collection tubes, pressing the piston rod in the syringe tube releases the dispensing agent. Extraction can only be performed after the negative pressure environment in the fluid collection tube is broken. The structure is complex and the operation is cumbersome. This allows for the extraction of bone cement monomers in batches, reducing the amount of bone cement monomers and bone cement powder and shortening the reaction time. During the preoperative preparation stage, the bone cement monomers in one collection tube are extracted, mixed, and set aside for use. If additional treatment is required during the injection process, there will be no waste because the bone cement monomers in other collection tubes have not been mixed with the bone cement powder. After the additional treatment is completed, the bone cement monomers in the other collection tubes can be extracted, mixed, and injected. However, after dividing the bone cement monomers into equal portions, the reaction time between each portion and the bone cement powder is much shorter than the preoperative preparation time, but longer than the injection time required by the doctor during the surgery. Therefore, they are usually mixed and prepared in the later stages of the preoperative preparation. However, when the patient's condition is complex or the affected area is unstable, the doctor cannot control the treatment time well, which can easily cause the prepared bone cement to solidify and be wasted. When the prepared bone cement solidifies, there is not enough time to mix and react with the bone cement monomers in the second collection tube, which affects the treatment effect. Therefore, the negative pressure dispenser with publication number CN118615159A, which can perform high-precision dispensing of bone cement monomers, is generally used in surgeries where the patient's condition is simple and the treatment is not complicated.Furthermore, the negative pressure dispenser with publication number CN118615159A, which is capable of high-precision dispensing of bone cement monomers, can only be made into a structure that equally distributes the bone cement monomers and cannot be made into a structure that allows for free dispensing. If free dispensing is to be achieved, the inner volume of the four collection tubes needs to be set to be different. However, when the inner volume of the four collection tubes is different, the pressure generated when the piston sleeve is pressed down is uneven, which will cause the piston sleeve to tilt. Gaps may easily appear between the piston sleeve and the rubber plug, resulting in air leakage and making it impossible to completely dispense the bone cement monomers in the dispenser. Utility Model Content

[0003] The purpose of this invention is to provide a free quantitative bone cement monomer dispenser that is simple in structure and easy to operate.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a free-quantity bone cement monomer dispenser, comprising: a connecting body, with a collection hole and a connecting groove respectively provided at the upper and lower ends of the connecting body; a break-off component containing an ampoule is sealed in the collection hole; a filter cloth is provided between the break-off component and the collection hole; a dispensing body is sealed in the connecting groove; four collection holes are provided in the dispensing body, all four collection holes being connected to the collection hole; and a piston is movably sealed in the collection holes. When the pistons in the four collection holes descend to their positions, the four... The total volume of the collection orifice matches the volume of the bone cement monomer in the ampoule. Four numbers are engraved on the dispensing body, each corresponding to a collection orifice and representing the volume of that orifice's inner cavity. A liquid outlet is provided on the piston, and a liquid outlet tube extends downward from the liquid outlet. A piston rod is mounted on the piston, extending downward from the collection orifice, and the liquid outlet tube extends downward from the piston rod. A one-way Luer connector is provided on the liquid outlet tube, and the flow direction of the one-way Luer connector is from the outside to the liquid outlet tube. A balance seat is provided on the dispensing body.

[0005] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, the fluid collection hole includes a cylindrical section and an inverted conical section. The large-diameter end of the inverted conical section is connected to the cylindrical section, and the small-diameter end of the inverted conical section is connected to the connecting groove. A step is provided at the transition between the inverted conical section and the cylindrical section. The filter cloth is laid on the step, and the break-off component is sealed and clamped in the cylindrical section and abuts against the step to press the filter cloth together.

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

[0007] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, a guide platform is provided protruding upward in the middle of the dispensing body. The central axis of the guide platform is coaxial with the central axis of the fluid collection hole. Four guide surfaces are provided on the guide platform, and the four guide surfaces are connected to the four fluid collection holes one by one. A circulation groove is left between the guide platform and the fluid collection hole.

[0008] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, an inner limiting platform is provided at the bottom of the collection hole, and several guide ribs are evenly distributed around the outer wall of the piston rod, with the guide ribs abutting against the inner limiting platform.

[0009] Furthermore, in the aforementioned free quantitative bone cement monomer dispenser, the balance seat is smaller at the top and larger at the bottom, and four dividing grooves are evenly distributed around the circumference of the balance seat. The piston rods in the four collection holes are located in the four dividing grooves respectively.

[0010] Furthermore, in the aforementioned free-quantitative bone cement monomer dispenser, the inner cavities of the four collection holes are of equal volume.

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

[0012] The advantages of this invention are: simple overall structure and convenient operation. The free quantitative bone cement monomer dispenser described in this invention can be designed in two series: equal-division structure and unequal-division structure, to adapt to different usage requirements. If the inner volumes of the four collection holes are the same, and the total inner volume of the four collection holes matches the volume of the bone cement monomer in the ampoule after the pistons in the four collection holes have descended to their positions, the bone cement monomer in the ampoule can be evenly distributed. If the inner volumes of the four collection holes are not the same, and the total inner volume of the four collection holes matches the volume of the bone cement monomer in the ampoule after the pistons in the four collection holes have descended to their positions, then… This device can quantitatively distribute bone cement in ampoules. After the ampoule in the breaking assembly is broken, the bone cement monomers will enter the collection hole after being filtered by the filter cloth under their own weight. Then, they will come into contact with the four collection holes. After the pistons in the four collection holes are pulled down to their positions, the bone cement monomers can be distributed into the four collection holes. When extracting bone cement monomers, the stirring syringe can be directly inserted into the one-way Luer connector for extraction. The whole process is carried out under normal pressure, which eliminates the need for complex operations such as negative pressure and pressurization to perform equal distribution and extraction, as required by the negative pressure distributor with publication number CN118615159A, which can perform high-precision dispensing of bone cement monomers. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the free quantitative bone cement monomer dispenser of this utility model.

[0014] Figure 2 yes Figure 1 A schematic diagram of the explosion structure.

[0015] Figure 3 yes Figure 1 A cross-sectional structural diagram.

[0016] Figure 4 yes Figure 1 A schematic diagram of the structure connecting the middle connector and the distributor.

[0017] Figure 5 yes Figure 1 A cross-sectional view of the connecting body.

[0018] Figure 6 This is a three-dimensional structural schematic diagram of Embodiment 2 of the free quantitative bone cement monomer dispenser of this utility model.

[0019] Figure 7 yes Figure 6 A cross-sectional structural diagram. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments.

[0021] like Figures 1 to 7As shown, the free-quantitative bone cement dispenser of this utility model includes: a connecting body 1, with a fluid collection hole 11 and a connecting groove 12 respectively provided at the upper and lower ends of the connecting body 1. The fluid collection hole 11 includes a cylindrical section 111 and an inverted conical section 112. The large-diameter end of the inverted conical section 112 is connected to the cylindrical section 111, and the small-diameter end of the inverted conical section 112 is connected to the connecting groove 12. A step is provided at the transition between the inverted conical section 112 and the cylindrical section 112, and a filter cloth 2 is laid on the step. The filter cloth 2 separates the cylindrical section 11 and the inverted conical section 112. The filter cloth 2 is cut from medical gauze with a thickness of 0.2mm, which is convenient for production and... The cost is low. A break-off component 4 containing an ampoule 3 is sealed and fitted inside the cylindrical section 111 of the collection hole 11. The break-off component 4 presses against the step to compress the filter cloth 2. The break-off component 4 in this embodiment is similar in structure to the break-off filter component in the negative pressure distributor with high-precision dispensing of bone cement monomers disclosed in CN118615159A. The break-off component 4 includes: a lower sleeve 41, a rotating sleeve 42, and an upper sleeve 43. The lower sleeve 41 is sealed and inserted into the cylindrical section 111 of the collection hole 11 and presses against the step to compress 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 rotating sleeve 42 has a mounting hole. The bottom of the upper sleeve 43 is connected to the top of the rotating sleeve 42, and the upper sleeve 43 communicates with the mounting hole of the rotating sleeve 42. A cap 421 is rotatably mounted at both ends of the rotating sleeve 42. The cap 421 is sealed to the rotating sleeve 42 via a sealing ring. A knob 422 is located between the two caps 421. A through hole 423 aligned vertically with the mounting hole is opened in the knob 422. A sealing cap 431 is threaded onto the top of the upper sleeve 43. When installing the ampoule 3, the sealing cap 431 is unscrewed, and the cap 421 is rotated to align the through hole 423 on the knob 422 with the mounting hole. Then, insert the ampoule 3 with the bottle head facing down into the upper sleeve 43. After the bottle head of the ampoule 3 passes through the mounting hole of the rotating sleeve 42, it extends into the straight hole 423. Then, screw the sealing cap 431 back onto the upper sleeve 43. At this time, the bottom of the ampoule 3 abuts against the sealing cap 431, and the neck of the ampoule 3 abuts against the mounting hole. When it is necessary to break the ampoule 3, simply rotate the cap 421, and the knob 422 will break the neck of the ampoule 3, so that the broken part of the bottle head of the ampoule 3 is tilted downward. The bone cement monomer in the bottle body and bottle head of the ampoule 3 will flow into the inverted conical section 112 of the collection hole 11 through the filter cloth 2.

[0022] A distribution body 5 is sealed within the connecting groove 12. Four collection holes 51 are provided within the distribution body 5, each connected to a collection port 11. A piston 52 is movably sealed within each collection hole 51. When the four pistons 52 descend to their designated positions, the total volume of the inner cavity of the four collection holes 51 matches the volume of the bone cement monomer in the ampoule 3, ensuring that the bone cement monomer in the ampoule 3 completely fills the four collection holes 51. Four numbers are engraved on the distribution body 5, each corresponding to a collection hole 51 and representing the inner cavity volume of that collection hole 51. A dispensing valve is provided on the piston 52. A liquid outlet pipe 53 with an inner diameter of 1.5-2 mm is provided extending downward from the liquid outlet hole. A piston rod 54 is clamped on the piston 52, extending downward from the liquid collection hole 51. The liquid outlet pipe 53 extends downward from the piston rod 54. A one-way Luer connector 55 is provided on the liquid outlet pipe 53. The flow direction of the one-way Luer connector 55 is from the outside to the liquid outlet pipe 53. An inner limiting platform 511 is provided at the bottom of the liquid collection hole 51. When the piston rod 54 drives the piston 52 to move downward and abut against the inner limiting platform 511, it indicates that the piston 52 has descended to the correct position. On the outer wall of the piston rod 54... A number of guide ribs 541 are evenly distributed around the circumference. The guide ribs 541 abut against the inner limiting platform 511. The guide ribs 541 not only increase the strength of the piston rod 54, but also play a role in stabilizing the guide. A flow guide platform 56 is provided protruding upward in the middle of the distribution body 5. The central axis of the flow guide platform 56 is coaxial with the central axis of the liquid collection hole 11. Four flow guide surfaces are provided on the flow guide platform 56, and the four flow guide surfaces are connected to the four liquid collection holes 51. An annular groove 561 is left between the flow guide platform 56 and the liquid collection hole 11. The flow guide platform 56 can prevent bone cement monomers from remaining in the distribution body 5 and thus preventing incomplete filling. The flow into the four collection holes 51 is such that the circulation groove 561 between the guide platform 56 and the collection hole 11 is provided to allow the bone cement monomers to circulate in the distribution body 5. When one collection hole 51 is full of bone cement monomers, the excess bone cement monomers located at that collection hole 51 can flow into another collection hole 51 through the circulation groove 561. A balance seat 6 is provided on the distribution body 5. The balance seat 6 is smaller at the top and larger at the bottom to improve the stability of the balance seat 6 when it is placed. Four partition grooves 61 are evenly distributed around the circumference of the balance seat 6, and the four piston rods 54 are located in the four partition grooves 61 respectively.

[0023] In use, first break the ampoule 3 with the breaking component 4. The bone cement monomer in the ampoule 3 will flow into the inverted conical section 112 of the collection hole 11 after being filtered by the filter cloth 2 under its own weight, and then flow into the four collection holes 51. Since the outlet tube 53 on the piston 52 in the collection hole 51 is blocked by the one-way Luer connector 55, and the inner diameter of the outlet tube 53 is only 1.5-2mm, the bone cement monomer in the collection hole 51 will not enter the one-way Luer connector 55 due to the surface tension. The outlet tube 53 is blocked by the Luer connector 55, so it cannot flow out. Then, the piston rod 54 is pulled to drive the piston 52 downward. The suction generated by the movement of the piston 52 draws the bone cement monomer in the collection hole 11 into the collection hole 51. When the piston 52 descends to the bottom, the collection hole 51 is filled with bone cement monomer. Then, all collection holes 51 are filled in turn. When it is necessary to use a stirring syringe to extract bone cement monomer, the stirring syringe is inserted into the one-way Luer connector 55 to extract it directly.

[0024] Example 1

[0025] The four collection holes 51 have the same internal volume. When the pistons 52 in the four collection holes 51 descend to their positions, the internal volumes of the four collection holes 51 remain the same, and the total volume of the four collection holes 51 matches the volume of the bone cement monomer in the ampoule 3. Therefore, the four collection holes 51 can equally divide the bone cement monomer in the ampoule 3. In this embodiment, taking a volume of 10 ml of bone cement monomer in the ampoule 3 as an example, the fact that the internal volumes of the four collection holes 51 are the same indicates that the internal volume of each of the four collection holes 51 after the pistons 52 descend to their positions is 2.5 cm³. 3 The four collection holes 51 can evenly distribute the bone cement monomers in the ampoule 3. The amount of bone cement monomers in each collection hole 51 is 2.5 ml. Four "2.5" marks are engraved on the dispensing body 5, each "2.5" corresponding to one collection hole 51, indicating that the inner volume of that collection hole 51 is 2.5 cm³. 3 .

[0026] Example 2

[0027] The internal volumes of the four collection holes 51 are different. When the pistons 52 in the four collection holes 51 descend to their positions, the internal volumes of the four collection holes 51 are different. However, the total volume of the four collection holes 51 matches the volume of the bone cement monomer in the ampoule 3. The four collection holes 51 can also distribute the bone cement monomer in the ampoule 3. In this embodiment, taking the volume of the bone cement monomer in the ampoule 3 as 10 ml as an example, and the internal volumes of the four collection holes 51 after the pistons 52 descend to their positions as 1 cm³, respectively... 3 2cm 3 3cm 3 4cm 3The four collection holes 51 can also dispense the bone cement from the ampoule 3. The amount of bone cement monomer in the four collection holes 51 is 1ML, 2ML, 3ML, and 4ML, respectively. The dispensing body 5 is engraved with the numbers "1", "2", "3", and "4", each number corresponding to a collection hole 51, thus indicating the inner volume of the inner cavity of that collection hole 51. By setting inner limiting stages 511 of different heights in the four collection holes 51, collection holes 51 with different inner cavity volumes can be obtained, and the piston 52 in the collection holes 51 can be limited.

[0028] As can be seen from Embodiments 1 and 2, when the free-quantitative bone cement monomer dispenser of this utility model is designed into two series—an equal-division structure and an unequal-division structure—doctors can select a series according to actual usage requirements, thereby improving the applicability of the free-quantitative bone cement monomer dispenser of this utility model. When encountering surgical procedures involving patients with complex conditions and unstable lesions, the unequal-division structure can be selected. Before surgery, it is not necessary to mix the bone cement monomers and bone cement powder in advance. In this way, no matter how long the doctor operates during the operation, bone cement will not solidify. When injection is required, the bone cement monomers in the smallest volume collection hole 51 are mixed with the bone cement powder first, improving the mixing reaction efficiency and allowing the small volume of bone cement monomers and bone cement powder to mix. After the bone cement is formed by rapid mixing and reaction, it is injected quickly. During this process, the bone cement monomers and bone cement powder in the other three collection holes 51 are mixed sequentially. After the bone cement formed by the mixture of bone cement monomers in the collection hole 51 with the smallest inner cavity volume is injected, the bone cement monomers and bone cement powder in the second smallest collection hole 51 are also mixed and reacted and can be connected to continue injection. After the bone cement formed by the mixture of bone cement monomers in the second smallest collection hole 51 is injected, the bone cement monomers and bone cement powder in the third smallest collection hole 51 are also mixed and reacted and can be connected to continue injection. Finally, the bone cement formed by the mixture of bone cement monomers and bone cement powder in the largest collection hole 51 is connected to continue injection. In this way, orderly connection is achieved to achieve continuous injection. When encountering patients with simple conditions and uncomplicated surgeries, an equal-part structure is selected. Based on the preoperative preparation time and the approximate treatment time during the surgery, equal parts of bone cement monomer and bone cement powder are mixed and reacted before the surgery. After each treatment is nearly completed, equal parts of bone cement monomer and bone cement powder are mixed and reacted and then injected.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A free dosing bone cement monomer dispenser comprising: The connecting body is characterized in that: a liquid collecting hole and a connecting groove are arranged at the upper and lower ends of the connecting body respectively, a break assembly provided with an ampoule is sealingly arranged in the liquid collecting hole, a filter cloth is arranged between the break assembly and the liquid collecting hole, a distribution body is sealingly arranged in the connecting groove, four liquid collecting holes are arranged in the distribution body, the four liquid collecting holes are communicated with the liquid collecting hole, a piston is movably sealingly arranged in the liquid collecting hole, when the piston in the four liquid collecting holes is lowered to position, the total volume of the inner cavities of the four liquid collecting holes matches the volume of the bone cement monomer in the ampoule, four numbers are engraved on the distribution body, each number corresponds to a liquid collecting hole and represents the volume of the inner cavity of the liquid collecting hole, a liquid outlet hole is arranged on the piston, a liquid outlet pipe is arranged on the liquid outlet hole and extends downward, a piston rod is clamped on the piston and extends downward from the liquid collecting hole, a one-way luer joint is arranged on the liquid outlet pipe, the flow direction of the one-way luer joint is from the outside to the liquid outlet pipe, and a balance seat is arranged on the distribution body.

2. The free dosing bone cement monomer dispenser of claim 1, wherein: The liquid collecting hole comprises a cylindrical section and an inverted conical section, the large-diameter end of the inverted conical section is connected with the cylindrical section, the small-diameter end of the inverted conical section is communicated with the connecting groove, a step is arranged at the transition of the inverted conical section and the cylindrical section, the filter cloth is arranged on the step, and the break assembly is sealingly clamped in the cylindrical section and abuts against the step to press the filter cloth.

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

4. The free dosing bone cement monomer dispenser of claim 1, wherein: A flow guide table is upwardly protrudingly arranged at the middle part of the distribution body, the central axis of the flow guide table is coaxial with the central axis of the liquid collecting hole, four flow guide surfaces are arranged on the flow guide table and communicated with the four liquid collecting holes one by one, and a circulation groove is left between the flow guide table and the liquid collecting hole.

5. The free dosing bone cement monomer dispenser of claim 1, wherein: An inner limiting table is arranged at the bottom of the liquid collecting hole, and a plurality of guide ribs are circumferentially and uniformly arranged on the outer side wall of the piston rod and abut against the inner limiting table.

6. The free dosing bone cement monomer dispenser of claim 1, wherein: The balance seat is small at the top and large at the bottom, four separation grooves are circumferentially and uniformly arranged on the balance seat, and the piston rods in the four liquid collecting holes are arranged in the four separation grooves respectively.

7. The free metering bone cement monomer dispenser of claim 1, wherein: The inner cavity volumes of the four liquid collecting holes are the same.

8. The free dosing bone cement monomer dispenser of claim 1, wherein: The inner cavity volumes of the four liquid collecting pipes are different.

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