A vertebral body spreader integrated with puncture, dilation and cement injection
By integrating puncture, expansion, and bone cement injection functions into one vertebral body expander, the problems of poor expansion directionality and high leakage rate in vertebral compression fracture surgery have been solved, resulting in shorter operation time, reduced patient suffering, and improved surgical efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BIJIADI (SHANGHAI) MEDICAL TECHNOLOGY CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, surgical treatment of vertebral compression fractures suffers from problems such as poor balloon dilation directionality, high bone cement leakage rate, and cumbersome surgical procedures, resulting in low surgical efficiency and significant patient suffering.
A vertebral body expander integrating puncture, dilation, and bone cement injection was designed. It combines traditional puncture, dilation, and bone cement injection systems, and adopts an inner and outer rod structure and an elastic expander to achieve integrated operation of vertebral body expansion and bone cement injection.
It significantly reduces surgery time, alleviates patient suffering, improves surgical efficiency, simplifies surgical procedures, and enhances the convenience and safety of the operation.
Smart Images
Figure CN224523222U_ABST
Abstract
Description
Technical Field
[0001] This application relates to vertebral body expanders, and more particularly to a vertebral body expander that integrates puncture, expansion, and bone cement injection. Background Technology
[0002] Compression fractures can lead to complications such as spinal deformities, difficulty standing and walking, joint stiffness, nerve damage, and fractures of adjacent segments. Osteoporosis is a systemic bone disease caused by various factors, characterized by decreased bone density and quality, damage to bone microstructure, increased bone fragility, and a predisposition to fractures. Currently, the incidence of vertebral compression fractures is also showing an increasing trend year by year.
[0003] Compression fractures of the spine in young people are often caused by high-energy injuries such as car accidents or falls from heights, resulting in vertebral compression fractures or burst fractures, which often compress nerves.
[0004] Vertebral compression fractures in the elderly are often caused by severe osteoporosis and can result from relatively minor external forces. Falls, lifting heavy objects, and even coughing can cause back and chest pain, raising suspicion of a compression fracture.
[0005] Currently, the treatment of vertebral compression screw fractures is usually performed using percutaneous kyphoplasty (PKP). However, balloon dilation is accomplished by applying pressure through a pressure injection system, which results in poor directionality and inconvenience in operation (the balloon expands in the direction of least resistance within the vertebral body, the direction of expansion is difficult to control, the shape of the resulting cavity is unpredictable, and rupture can occur during dilation). Furthermore, the leakage rate of bone cement is still relatively high even at low viscosity. If bone cement leaks into the spinal canal, it can cause paralysis; if it leaks into blood vessels, it can cause pulmonary, renal, and cerebral embolism.
[0006] Another traditional surgical procedure is percutaneous vertebroplasty (PVP), which involves inserting a needle into the vertebral body and injecting bone cement. Once the bone cement hardens, it immediately stabilizes the vertebral body. However, it is not very effective for restoring height after compression fractures.
[0007] The third type is a metal mechanical bone expander. The main body consists of a head expander, a handle, and a central screw for transmitting torque. The head has a hinged umbrella-like structure, composed of expander plates, support arms, and a central shaft. This technology is currently used in some clinical institutions. Its advantages include high expander force, good directionality, and the ability to sense the lifting force and actual situation through handle damping. The lifting height is controllable, and there is no risk of pouch rupture. Disadvantages include the complexity of the head components, high cost, high assembly precision requirements, and the fact that the head has a pin-hinge component structure, which cannot withstand axial impact forces. Therefore, it poses a potential challenge for manufacturers and researchers. Utility Model Content
[0008] The purpose of this invention is to provide a vertebral body expander that integrates puncture, dilation, and bone cement injection, combining the traditional three systems and surgical steps of puncture dilation, vertebral body expander, and bone cement injection into one, greatly reducing surgical time, minimizing patient suffering, and significantly improving surgical efficiency.
[0009] To achieve the above objectives, the present invention provides the following technical solution.
[0010] This application discloses a vertebral body diffuser integrating puncture, dilation, and bone cement injection. It includes a puncture head, the tail end of which is axially fixedly connected to one end of an inner rod. The outer periphery of the tail end of the puncture head is connected to one end of an elastic diffuser plate. The other end of the elastic diffuser plate is fixedly connected to one end of an outer rod. The inner rod is located inside the outer rod, and a bone cement channel is formed between the inner and outer rods. The elastic diffuser plate is strip-shaped, with multiple strips arranged circumferentially around the inner rod. A long groove is formed between adjacent elastic diffuser plates.
[0011] In use, after the puncture head is inserted into the corresponding position of the vertebral body, the outer rod remains stationary, and the inner rod pulls the puncture head back, expanding all the elastic spreading plates outward to form a cage. After the vertebral body is expanded, the inner rod is pushed forward to the initial position, and the elastic spreading plates return to their original state. Bone cement is then injected into the expanded vertebral body sequentially through the bone cement channel and the long groove.
[0012] Preferably, in the above-mentioned vertebral body expander that integrates puncture, dilation, and bone cement injection, the other end of the outer rod is fixedly connected to the handle, a sealed cavity is formed inside the handle, and the other end of the inner rod is connected to one end of the slider, which slides in the sealed cavity.
[0013] Preferably, in the above-mentioned vertebral body expander that integrates puncture, dilation, and bone cement injection, a sealing ring is provided on the outer side of the slider, and the sealing ring fits against the inner wall of the sealed cavity.
[0014] Preferably, in the above-mentioned vertebral body expander that integrates puncture, dilation, and bone cement injection, a syringe is formed on one side of the handle, and the injection channel of the syringe is sealed and connected to the sealed cavity.
[0015] Preferably, in the above-mentioned vertebral body expander that integrates puncture, dilation, and bone cement injection, the other end of the slider is connected to a knob, the knob protrudes to the outside of the handle, and the inner wall of the handle is connected to the outer wall of the knob by a thread.
[0016] Preferably, in the above-mentioned vertebral body expander that integrates puncture, dilation, and bone cement injection, the end of the knob is formed with a rotating handle.
[0017] Preferably, in the above-mentioned vertebral body expander that integrates puncture, dilation, and bone cement injection, a rotating cavity is formed on the side of the slider near the knob, a bolt is provided between the knob and the slider, the shank of the bolt passes through the slider and is fixedly connected to the knob, and the head of the bolt is attached to the end wall of the rotating cavity.
[0018] Preferably, in the above-mentioned vertebral body expander that integrates puncture, dilation, and bone cement injection, a fluoroscopic window is formed on the handle for observing the sealed cavity.
[0019] Compared with existing technologies, the advantages of this technical solution are: it integrates the traditional three systems and surgical steps of puncture dilation, vertebral body expansion, and bone cement injection into one, which greatly reduces the operation time, reduces the patient's pain, and greatly improves the efficiency of the operation. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 The diagram shown is a schematic of a vertebral body expander that integrates puncture, dilation, and bone cement injection in an embodiment of this utility model.
[0022] Figure 2 As shown Figure 1 Enlarged view of point A in the middle;
[0023] Figure 3 The figure shown is a cross-sectional view of a vertebral body expander that integrates puncture, dilation, and bone cement injection in an embodiment of this utility model.
[0024] Figure 4 As shown Figure 3 Enlarged view at point B in the middle;
[0025] Figure 5 As shown Figure 3 Enlarged view of point C. Detailed Implementation
[0026] The technical solutions of the present utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0027] Combination Figure 1-5 As shown, the vertebral body diffuser 100, which integrates puncture, dilation, and bone cement injection, includes a puncture head 101. The tail end of the puncture head 101 is axially fixedly connected to one end of the inner rod 102, and the outer periphery of the tail end of the puncture head 101 is connected to one end of the elastic diffuser 103. The other end of the elastic diffuser 103 is fixedly connected to one end of the outer rod 104. The inner rod 102 is located inside the outer rod 104, and a bone cement channel 105 is formed between the inner rod 102 and the outer rod 104. The elastic diffuser 103 is strip-shaped, and multiple strips are arranged circumferentially around the inner rod 102. A long groove 106 is formed between two adjacent elastic diffusers 103.
[0028] In use, after the puncture head 101 is inserted into the corresponding position of the vertebral body, the outer rod 104 remains stationary, and the inner rod 102 pulls the puncture head 101 back, which expands all the elastic spreading plates 103 outward to form a cage 107. After the vertebral body is expanded, the inner rod 102 is pushed forward to the initial position, and the elastic spreading plates 103 return to their original state. Bone cement is then injected into the expanded vertebral body through the bone cement channel 105 and the long groove 106 in sequence.
[0029] In this embodiment, the traditional three systems and surgical steps of puncture dilation, vertebral body expansion, and bone cement injection are integrated into one, which greatly reduces the operation time, reduces the patient's pain, and greatly improves the efficiency of the operation.
[0030] Furthermore, the other end of the outer rod 104 is fixedly connected to the handle 108, and a sealed cavity 109 is formed inside the handle 108. The other end of the inner rod 102 is connected to one end of the slider 110, and the slider 110 slides in the sealed cavity 109.
[0031] In this embodiment, it is connected to a handle for easy operation, and bone cement is injected into the cage through a sealed cavity.
[0032] Furthermore, a sealing ring 111 is fitted on the outer side of the slider 110, and the sealing ring 111 fits against the inner wall of the sealing cavity 109.
[0033] In this embodiment, bone cement is prevented from flowing backward.
[0034] Furthermore, a syringe 112 is formed on one side of the handle 108, and the injection channel 118 of the syringe 112 is sealed and connected to the sealed cavity 109.
[0035] In this embodiment, bone cement is injected.
[0036] Furthermore, the other end of the slider 110 is connected to the knob 113, which protrudes to the outside of the handle 108. The inner wall of the handle 108 and the outer wall of the knob 113 are connected by threads. A rotating handle 114 is formed at the end of the knob 113, and the end face of the rotating handle 114 is in contact with the end face of the handle 108.
[0037] In this embodiment, the inner rod is retracted and pushed forward by rotating the handle.
[0038] Furthermore, a rotating cavity 115 is formed on the side of the slider 110 near the knob 113. A bolt 116 is provided between the knob 113 and the slider 110. The shank of the bolt 116 passes through the slider 110 and is fixedly connected to the knob 113. The head of the bolt 116 is attached to the end wall of the rotating cavity 115.
[0039] In this embodiment, the inner rod cannot be rotated when the handle is turned. Therefore, a rotating cavity is designed to enable the inner rod to move forward and backward, but not to rotate.
[0040] Furthermore, a viewing window 117 is formed on the handle 108 for observing the sealed cavity 109.
[0041] In this embodiment, it is convenient to observe the injection of bone cement.
[0042] In summary, this utility model mainly consists of a knob, a handle, a cage-like head support, and a bone cement injector. In the initial state, the cage-like head support is closed. In the working state, the head has a cage-like support structure to effectively support the injured vertebrae and restore the physiological height of the vertebrae.
[0043] The elastic support plate serves to support the vertebral body, maintain its stability, elevate it, and restore its physiological height. Its structure abandons the traditional hinged assembly structure, adopting a one-piece cage structure, ensuring mechanical performance and eliminating the need to consider assembly precision or component precision. The tip of the head is designed with four cutting edges to facilitate vertebral puncture and channel cleaning when establishing the working channel. A gap is provided between the outer and inner rods, through which bone cement flows into the head cage and gradually diffuses and fills the surrounding space. The handle incorporates a bone cement injector; this injector and handle are also designed as a single unit, eliminating the need to consider interface issues when assembling with other injectors.
[0044] The following are the surgical procedures for using this utility model:
[0045] 1. Preoperative preparation, including disinfection and anesthesia;
[0046] 2. Make an incision in the skin of the injured vertebra down to the cortical bone of the pedicle;
[0047] 3. Use a skin retractor to expand the skin and muscle at the puncture site;
[0048] 4. Use the tip of this invention to puncture the cortical bone of the pedicle;
[0049] 5. After penetrating the cortical bone, use a rotation and puncture method to drill deeper into the pedicle. Under C-arm fluoroscopy, stop the puncture when it reaches 1 / 4 of the distance from the posterior wall of the vertebral body.
[0050] 6. Rotate the handle clockwise. There is no need to consider the direction of lifting. The head gradually opens due to the elastic force of the bridging part, forming a cage-like structure. Determine whether the vertebral endplate has been lifted to the physiological height based on the fluoroscopy and the scale reading of the handle.
[0051] 7. Rotate the handle counterclockwise to the initial position, and the head bridge spring will return to a flat state;
[0052] 8. Fill the prepared bone cement into the syringe and inject it. Confirm the diffusion according to the scale and C-arm image.
[0053] 9. Remove the product and treat the opposite vertebral body in the same way.
[0054] Therefore, this invention integrates the traditional three systems and surgical steps of puncture dilation, vertebral body expansion, and bone cement injection into one, greatly reducing surgical time, minimizing patient suffering, and significantly improving surgical efficiency. The continuous updating and iteration of intelligent and minimally invasive medical technologies will undoubtedly be the future development direction. With the support of 3D printing technology, even safer and more effective medical device products will surely emerge.
[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0056] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A vertebral body spreader integrated with a puncture, dilation, and cement injection, characterized in that, The puncture head is fixedly connected with one end of the inner rod, and the tail end of the puncture head is connected with one end of the elastic expansion sheet, and the other end of the elastic expansion sheet is fixedly connected with one end of the outer rod, and the inner rod is located in the inner rod, and the bone cement channel is formed between the inner rod and the outer rod, the elastic expansion sheet is strip-shaped, and a plurality of elastic expansion sheets are arranged around the inner rod, and a long slot is formed between the adjacent two elastic expansion sheets, In use, the puncture head is inserted into the corresponding position of the vertebral body, the outer rod remains stationary, the inner rod pulls back the puncture head, and all the elastic expansion sheets are expanded outward to form a cage, after the vertebral body is expanded, the inner rod is pushed forward to the initial position, the elastic expansion sheet returns to the original state, and the bone cement is injected into the expanded vertebral body through the bone cement channel and the long slot.
2. The vertebral body impinger of claim 1, wherein: The other end of the outer rod is fixedly connected with the handle, and the handle is internally formed with a sealed cavity.
3. The set according to claim 2, wherein the set is a set of vertebral spreader which integrates puncture, expansion and cement injection. The other end of the inner rod is connected with one end of the sliding block, and the sliding block is slidably arranged in the sealed cavity.
4. The set according to claim 2, wherein the set is a set of vertebral spreader which integrates puncture, expansion and cement injection. The outer side of the sliding block is sleeved with a sealing ring, and the sealing ring is abutted against the inner wall of the sealed cavity.
5. The set according to claim 2, wherein the set is a set of vertebral spreader which integrates puncture, expansion and cement injection. One side of the handle is formed with a syringe, and the injection channel of the syringe is sealingly communicated with the sealed cavity.
6. The set according to claim 5, wherein the set is a set of vertebral spreader which integrates puncture, expansion and cement injection. The other end of the sliding block is connected with a knob, and the knob protrudes to the outside of the handle.
7. The set according to claim 5, wherein the set is a set of vertebral spreader which integrates puncture, expansion and cement injection. The inner wall of the handle and the outer wall of the knob are connected by threads.
8. The set according to claim 2, wherein the set is a set of vertebral spreader which integrates puncture, expansion and cement injection. The end of the knob is formed with a rotating handle. The side of the sliding block close to the knob is formed with a rotating cavity, and a bolt is arranged between the knob and the sliding block, the rod of the bolt passes through the sliding block and is fixedly connected with the knob, and the head of the bolt is abutted against the end wall of the rotating cavity. The handle is formed with a perspective window for observing the sealed cavity.