Bone cement filling device and method

Abstract

The invention relates to the technical field of bone cement filling, in particular to a bone cement filling device and method.The bone cement filling device comprises a stirring tank used for mixing bone cement raw materials, the top of the stirring tank is provided with an opening, and a sleeve is internally provided with a bone cement conveying channel; a transparent hose is arranged at the input end of the sucking pump, connectors are arranged at the two ends of the sleeve, one connector of the sleeve is detachably connected with the input end of the transparent hose in a sealed mode, and the other connector of the sleeve is detachably connected with an opening of the stirring tank in a sealed mode. Bone cement can be transferred into the casing pipe under the condition of negative pressure after being mixed, the situation that a large amount of air is mixed into the bone cement when the bone cement enters the casing pipe is avoided, meanwhile, exhaust of air in the bone cement can be accelerated by arranging an ultrasonic oscillator, and the solidification speed of the bone cement can be delayed by arranging a semiconductor chilling plate; therefore, the purpose of prolonging the emptying time is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of bone cement filling devices, and in particular to a bone cement filling device and method. Background Art

[0002] Bone cement is used to fill compression fractures caused by osteoporosis in patients, and it is mostly used in the vertebral bodies of the human body. When osteoporosis occurs inside the vertebral body, the load-bearing capacity of the vertebral body will decrease. When bearing a relatively high weight, it will cause pain in the vertebral body. At the same time, due to osteoporosis inside the vertebral body, its load-bearing capacity also decreases, making it prone to compression fractures. For patients with compression fractures, clinically, bone cement is mostly used to fill the inside of the vertebral body to enable the vertebral body to have a higher load-bearing capacity.

[0003] The raw materials of bone cement are powdery raw materials and liquid raw materials. When in use, the powdery raw materials and liquid raw materials are stirred and mixed to form a paste. Under normal temperature conditions, after about ten-odd minutes, the bone cement will solidify. Therefore, the time from stirring and mixing to solidification of the bone cement is very short. There will be a wire-drawing state between its paste state and solidification state, that is, pinch the bone cement with your hand and then open it, and the bone cement will form a wire. In this state, the bone cement is transferred into a sleeve, and then an extrusion rod is used to squeeze the bone cement in the sleeve into the cavity of the vertebral body.

[0004] The problems existing in the prior art are that the time from mixing to forming a wire-drawing state of the existing bone cement is very short. During the mixing process of part of the bone cement, air will be mixed inside the bone cement due to bubbles, thereby affecting the structural strength after the bone cement solidifies. Although there is a method in the prior art to mix and stir the bone cement under negative pressure to reduce the bubbles inside the bone cement, during the use of the existing bone cement, there are still the following two defects. First, during the process of transferring the bone cement into the sleeve, it will still come into contact with the air inside the sleeve, resulting in a small amount of air being mixed into the bone cement.

[0005] Second, since the time from the paste state to the wire-drawing state of the bone cement is short, and only the negative pressure method is used to remove the bubbles in the bone cement, the effect is also limited. Based on the above two problems, a bone cement filling device and method need to be designed to solve the above problems. Summary of the Invention

[0006] The present invention provides a bone cement filling device and method, which can enable the bone cement to be transferred into the sleeve under negative pressure conditions after mixing, avoiding a large amount of air being mixed into the bone cement when it enters the sleeve. At the same time, an ultrasonic oscillator is provided to accelerate the discharge of air inside the bone cement, and a semiconductor refrigeration sheet is provided to delay the solidification speed of the bone cement, so as to achieve the purpose of extending the evacuation time.

[0007] The technical problem solved by the present invention is achieved by the following technical solutions:

[0008] A bone cement filling device includes a stirring tank for mixing bone cement raw materials and having an opening at the top, and a casing with a bone cement conveying channel inside. An air extraction pump is further provided on one side of the stirring tank. The input end of the air extraction pump is provided with a transparent hose. Both ends of the casing have connectors. One connector of the casing is detachably and sealingly connected to the input end of the transparent hose, and the other connector of the casing is detachably and sealingly connected to the opening of the stirring tank.

[0009] Preferably, it further includes a pressing rod for extruding the bone cement inside the conveying channel of the casing.

[0010] Preferably, the pressing rod includes a rod-shaped body with a piston at the end.

[0011] Preferably, the connection between the opening of the stirring tank and the connector of the casing is through a conical body. The inner wall of the flared end of the conical body is connected to the outer wall of the stirring tank by threads, and the converging part of the conical body is detachably and sealingly connected to the connector of the casing.

[0012] Preferably, a semiconductor refrigeration sheet for cooling the inside of the stirring tank is installed outside the bottom wall of the stirring tank.

[0013] Preferably, ultrasonic vibrators are further provided on the outer wall of the stirring tank.

[0014] Preferably, handles are provided on both the pressing rod and the casing.

[0015] A bone cement filling method, the method is based on a bone cement filling device as claimed in the claims, and the bone cement filling method includes the following steps;

[0016] S1 Stir and mix the bone cement raw materials;

[0017] S2 Exhaust air from the mixed bone cement raw materials under negative pressure;

[0018] S3 Transfer the mixed bone cement raw materials to the inside of the conveying channel of the casing under negative pressure conditions;

[0019] S4 Use the pressing rod to extrude the bone cement inside the casing into the bone cavity.

[0020] Preferably, while step S2 is being carried out, step S2a is also carried out to ultrasonically vibrate the mixed bone cement raw materials.

[0021] Preferably, while steps S1 and S2 are being carried out, step S12 is also carried out to cool the bone cement.

[0022] The beneficial effects of the present invention are as follows: It enables the bone cement to be transferred into the interior of the sleeve under negative pressure after mixing, avoiding the mixing of air inside when the bone cement enters the interior of the sleeve. At the same time, an ultrasonic oscillator is provided to accelerate the discharge of air inside the bone cement, and a semiconductor refrigerating sheet is provided to delay the solidification speed of the bone cement, thereby achieving the purpose of extending the air exhaust time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the mixing tank of the present invention:

[0025] Figure 2 It is a schematic structural diagram of each component of the present invention before splicing;

[0026] Figure 3 It is a schematic structural diagram of the first state during the use process of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the second state during the use process of the present invention;

[0028] Figure 5 For the present invention Figure 4 cross-sectional schematic diagram;

[0029] Figure 6 It is a schematic structural diagram of the present invention when the sleeve is used in combination with the extrusion rod.

[0030] In the figure, 1, mixing tank; 2, mixing chamber; 3, sleeve; 4, conveying channel; 5, piston; 6, rod-shaped body; 7, air extraction pump; 8, transparent hose; 9, cone; 10, catheter; 11, vertebra; 12, bone cavity; 13, handle; 14, semiconductor refrigerating sheet; 15, connecting plug; 16, ultrasonic oscillator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0032] Refer to Figures 1 - 6 , the present invention provides a bone cement filling device on the one hand. Refer to Figure 2, which includes a mixing tank 1, an air extraction pump 7, a sleeve 3 and an extrusion rod. At the input end of the air extraction pump 7 (the end where air flows into the air extraction pump 7), there is a transparent hose 8. During the specific use process, first, as Figure 1 shown, pour both the liquid raw material and the powder raw material of the bone cement into the mixing chamber 2 inside the mixing tank 1. When the liquid raw material and the powder raw material are stirred and mixed into a highly fluid paste with a stirring rod (not shown in the figure), stop stirring. Take a small amount of the mixed raw material as a comparison sample and place it outside the mixing tank 1. Then proceed as Figure 3 shown, quickly seal and connect the two ends of the sleeve 3 to the top opening of the mixing tank 1 and the input port of the transparent hose 8 respectively. At this time, start the air extraction pump 7 to evacuate the inside of the mixing tank 1 to form a negative pressure inside the mixing tank 1, which is convenient for the bubbles in the mixed bone cement to be discharged. During the evacuation, constantly observe whether the mixed raw material comparison sample taken outside the mixing tank 1 reaches the drawable state that can be used (pinch the bone cement with your hand and then open it to see if the bone cement raw material shows drawing). When the comparison sample reaches this state (under conditions allowing, refrigeration comparison should be carried out, which is the same temperature as the semi - conductor refrigeration sheet 14 used for refrigeration of the mixing tank 1 in the following text), turn it into the state as Figure 3 shown and then invert it into the state as Figure 4 shown. At this time, under the dual action of negative pressure and the self - gravity of the bone cement, the bone cement enters the conveying channel 4 of the sleeve 3. At this time, the inside of the conveying channel is in a negative pressure state, which can reduce the contact between the bone cement and air. When the bone cement fills the conveying channel 4 of the sleeve 3, it will enter the inside of the transparent hose 8. When it is observed that the bone cement enters the transparent hose 8, stop the operation of the air extraction pump 7, remove the sleeve 3 between the mixing tank 1 and the transparent hose 8, and then cooperate with the extrusion rod to carry out the bone cement pushing work. When pushing, as Figure 6 shown, it is also necessary to cooperate with a catheter 10 that has been fixed on the vertebra 11 and is connected to the internal cavity of the vertebra 11 (the cavity is formed by balloon dilation, which is not an existing method in the treatment of vertebral compression fractures and will not be elaborated in detail here). That is, insert the sleeve 3 along the inside of the catheter 10 until one end of the sleeve 3 extends into the bone cavity 12. Push the extrusion rod inside the sleeve 3, and the bone cement in the conveying channel 4 of the sleeve 3 can be squeezed into the bone cavity 12. Since the bone cement does not contact a large amount of air when it is transferred into the sleeve 3 and air is exhausted before the transfer, when the bone cement is pushed in this way, the number of bubbles in the bone cement is less, and the hardness after the bone cement solidifies later is also higher.

[0033] Further, the top opening of the mixing tank 1 is designed to be small for facilitating the connection with the sleeve 3. However, a small opening is not convenient for feeding the bone cement raw materials and achieving rapid and uniform mixing. Therefore, the top opening of the mixing tank 1 is designed to be large enough to facilitate the feeding of the bone cement raw materials. Since the existing size of the sleeve 3 is small, a conical body 9 needs to be designed at the top opening of the sleeve 3 and the mixing tank 1 to realize the connection between the two. The flared position of the conical body 9 is thread-sealed and connected to the outer wall of the mixing tank 1, and the necked position of the conical body 9 is connected to the sleeve 3. Connectors (not shown in the figure) are provided at both ends of the sleeve 3, the necked position of the conical body 9, and the input end position of the flexible hose. Moreover, the connector at the necked position of the conical body 9 and the connector at one end of the sleeve 3 are detachably and sealedly connected, and the connector at the other end of the sleeve 3 and the connector at the input end of the transparent flexible hose 8 are also detachably and sealedly connected. The detachable and sealed connection method can be the way of a Luer connector or other ways, which are technologies known to those skilled in the art and will not be elaborated in detail here.

[0034] In order to facilitate the cooperation between the extrusion rod and the sleeve 3 and make it more convenient to operate, first, the extrusion rod includes a rod-shaped body 6. One end of the rod-shaped body 6 has a piston 5 for realizing sliding sealing with the internal conveying channel 4 of the sleeve 3. The other end of the rod-shaped body 6 has a handle 13 fixedly connected to the rod-shaped body 6. One end of the sleeve 3 also has a handle 13, and the handle 13 at the end of the sleeve 3 is penetrated by the conveying channel 4 without affecting the connection between the connector of the sleeve 3 and other parts. During use, the end of the extrusion rod with the piston 5 is inserted from the end of the sleeve 3 with the handle 13, and continuous pressure is applied to the extrusion rod while keeping the position of the sleeve 3 unchanged.

[0035] Further, to delay the setting speed of the bone cement and thus increase the air evacuation time of the bone cement, a semiconductor refrigeration sheet 14 for cooling the inside of the mixing tank 1 is installed outside the bottom wall of the mixing tank 1, and the inside of the mixing tank 1 can be cooled by the semiconductor refrigeration sheet 14.

[0036] Further, an ultrasonic vibrator 16 is also provided on the outer wall of the mixing tank 1. The ultrasonic vibrator 16 vibrates the bone cement inside the mixing tank 1, which can accelerate the discharge of air inside the bone cement and make the air evacuation effect of the bone cement better.

[0037] Specifically, the ultrasonic vibrator 16 and the semiconductor refrigeration sheet 14 can be connected to an external power supply through a connection plug 15 outside the mixing tank 1 as shown in Figure 3 or can be powered by setting a rechargeable power supply on the mixing tank 1.

[0038] On the other hand, the present invention also provides a method for filling bone cement. The implementation of this method is based on the above-mentioned bone cement filling device. The method includes the following steps:

[0039] S1 stirs and mixes the bone cement raw materials;

[0040] S2 evacuates air from the mixed bone cement raw materials under negative pressure;

[0041] S3 transfers the mixed bone cement raw materials into the conveying channel 4 of the sleeve 3 under negative pressure conditions;

[0042] S4 uses an extrusion rod to extrude the bone cement inside the sleeve into the bone cavity 12.

[0043] Furthermore, while step S2 is being carried out, step S2a is also carried out to ultrasonically vibrate the mixed bone cement raw materials.

[0044] Furthermore, while steps S1 and S2 are being carried out, step S12 is also carried out to cool down the bone cement.

[0045] In summary, the present invention reduces the situation of air being mixed into the bone cement by transferring the bone cement raw materials into the inside of the sleeve 3 under negative pressure conditions. At the same time, when the air in the bone cement is discharged, cooling the bone cement can delay the setting speed of the bone cement. By driving the bone cement to vibrate through the ultrasonic oscillator 16, the speed of air evacuation can be accelerated and the effect of air evacuation can be improved.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A bone cement filling device, comprising a mixing tank (1) for mixing bone cement raw materials and having an opening at the top, a sleeve (3) with a bone cement conveying channel (4) inside. One side of the mixing tank (1) is further provided with an air extraction pump (7), and the input end of the air extraction pump (7) is provided with a transparent hose (8), characterized in that, Both ends of the sleeve (3) are provided with connectors. One of the connectors of the sleeve (3) is detachably and sealingly connected to the input end of the transparent hose (8), and the other connector of the sleeve (3) is detachably and sealingly connected to the opening of the mixing tank (1).

2. The bone cement filling device according to claim 1, characterized in that, It further includes an extrusion rod for extruding the bone cement inside the conveying channel (4) of the sleeve (3).

3. The bone cement filling device according to claim 2, characterized in that, The extrusion rod includes a rod-shaped body (6) with a piston (5) at its end.

4. A bone cement filling device according to claim 1, characterized in that, The connection between the opening of the mixing tank (1) and the connector of the sleeve (3) is connected by a conical body (9). The inner wall of the flared end of the conical body (9) is connected to the outer wall of the mixing tank (1) by threads, and the necking part of the conical body (9) is detachably and sealingly connected to the connector of the sleeve (3).

5. The bone cement filling device according to claim 1, characterized in that, A semiconductor refrigerating sheet (14) for cooling the inside of the mixing tank (1) is installed outside the bottom wall of the mixing tank (1).

6. The bone cement filling device according to claim 1, characterized in that, An ultrasonic oscillator (16) is further provided on the outer wall of the mixing tank (1).

7. The bone cement filling device according to claim 2, wherein Handles (13) are provided on both the extrusion rod and the sleeve (3).

8. A bone cement filling method, characterized in that, The method is based on a bone cement filling device as described in claim 1, and the bone cement filling method includes the following steps; S1 Stir and mix the bone cement raw materials; S2 Exhaust the mixed bone cement raw materials under negative pressure; S3 Transfer the mixed bone cement raw materials to the inside of the conveying channel (4) of the sleeve (3) under negative pressure conditions; S4 Use the extrusion rod to extrude the bone cement inside the sleeve (3) into the bone cavity (12).

9. The bone cement filling method according to claim 8, characterized in that, While step S2 is being carried out, step S2a is also carried out to ultrasonically vibrate the mixed bone cement raw materials.

10. A method for filling bone cement as claimed in claim 8, characterized in that, While steps S1 and S2 are being carried out, step S12 is also carried out to cool the bone cement.

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