An adjustable gap osteotomy block

Abstract

The application discloses an adjustable gap type osteotomy block and relates to the technical field of medical devices, which comprises an osteotomy block body, the osteotomy block body is integrally formed by medical stainless steel, a floating osteotomy bottom plate is installed at the bottom of the osteotomy block body through an adjusting mechanism, the floating osteotomy bottom plate is vertically arranged with the osteotomy block body, and a numerical display screen is installed at the side of the osteotomy block body away from the floating osteotomy bottom plate; the adjusting mechanism comprises a micro servo motor, an adjusting screw rod is fixedly installed at the output shaft of the micro servo motor, and an inner thread ring is threadedly sleeved on the adjusting screw rod. The floating osteotomy bottom plate automatically dives to cooperate with a high-precision displacement sensor to directly collect the real gap of the femur, the gap ruler needs not to be repeatedly taken out for measurement, the automatic output of digital basic reference values can avoid subjective errors caused by manual visual inspection, the exposure time of the joint cavity is shortened, and the risk of postoperative infection and soft tissue adhesion is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an adjustable gap type osteotomy block. BACKGROUND

[0002] Unicompartmental knee arthroplasty (UKA) is a minimally invasive repair procedure for unicompartmental osteoarthritis and localized cartilage wear. Compared with total knee arthroplasty, it has the advantages of small trauma, less bleeding, faster postoperative recovery, and retention of proprioception. In recent years, the clinical application scale has continued to expand. The core technical difficulty of unicompartmental surgery is the precise osteotomy of femoral condyle and the control of flexion-extension gap balance: the height of distal femur and anterior-posterior condylar biplane osteotomy directly determines the symmetry of medial / lateral unicompartmental flexion-extension gap, prosthesis fitting pressure, and lower extremity alignment correction effect. An error of more than 0.5 mm in the reference height of osteotomy will cause postoperative prosthesis compression, joint clicking, pain, and early prosthesis wear and loosening, etc. Therefore, high accuracy is required for the adjustment of osteotomy guiding instruments and the objectivity of gap measurement during surgery.

[0003] The early clinical femoral osteotomy guiding instrument adopts an integrated fixed reference osteotomy block, which has no height adjustment capability. In view of the anatomical differences of different patients' femurs and the degree of cartilage wear and defect, the osteotomy height can only be adjusted by stacking multiple specifications of external gap pads. The pad specifications include 0.5 mm, 1 mm, 2 mm, 3 mm, etc. During the operation, the pads need to be repeatedly disassembled, stacked, and compared for trial fitting. The number of pad changes in a single operation can reach more than ten times, significantly prolonging the exposure time of the joint cavity and increasing the risk of intraoperative infection and soft tissue contracture and adhesion. After the multi-layer pads are stacked, the fitting gap is large, and the pads are prone to slip and tilt under surgical vibration, causing the osteotomy plane to be skewed and the osteotomy volume to be out of control. For complex cases such as knee varus, knee valgus, and local bone defects, the adjustment error will be further magnified, and the surgical effect is highly dependent on the clinical experience of the lead surgeon, with a very low degree of standardization.

[0004] To solve the problems of pad adjustment, the industry has gradually developed adjustable osteotomy guiding instruments. The mainstream adjustment structure of existing technologies is a bevel sliding adjustment structure. A tibial fine adjustment osteotomy plate is disclosed, which changes the overall support height by relative sliding of two bevel panels. After adjustment, the bevel is compressed and positioned by a locking screw. This scheme eliminates the need for scattered pads, but the adjustment method is a step-by-step gradual adjustment without a continuous micro-adjustment interval. The bevel sliding process has a tendency to deviate horizontally, the limiting constraint ability is weak, and it is only suitable for tibial single-plane osteotomy, which cannot meet the needs of simultaneous osteotomy of femoral double-plane.

[0005] Currently, all types of adjustable osteotomy instruments used in clinical practice share a common shortcoming: the acquisition of interstitial gap values ​​relies entirely on manual measurement using an independent external gap gauge. During surgery, surgeons must repeatedly remove the osteotomy piece, insert the gap gauge to take the reading, and then reinstall the osteotomy piece to fine-tune the height, making the process of alternating instrument handling cumbersome; manual visual reading of the scale introduces subjective bias, with measurement errors exceeding 1mm in patients with osteoporosis, bone surface defects, or deformed single-compartment malformations; and there is no digital objective data recording throughout the entire process, resulting in a lack of unified quantitative reference for preoperative planning, intraoperative adjustments, and postoperative review. Differences in operating habits among different physicians can lead to inconsistent osteotomy plans for the same type of case, making it difficult to ensure surgical homogenization.

[0006] With the development trend of minimally invasive, precise, and intelligent orthopedic medicine, intelligent modules such as intraoperative navigation, sensor measurement, and electric execution are gradually being applied to joint replacement surgery. However, most existing intelligent instruments are large-scale intraoperative navigation systems, which are bulky, expensive, and have complex operating procedures, making them unsuitable for integration with small osteotomy guide blocks. Conventional osteotomy blocks on the market are still in the stage of purely mechanical manual adjustment, lacking a lightweight intelligent osteotomy device that integrates automatic gap detection, digital input, electric precise gap adjustment, and real-time numerical visualization. This fails to meet the clinical needs of low-cost popularization in the operating room, minimally invasive operation, and high-precision quantitative adjustment. Therefore, we have disclosed an adjustable gap osteotomy block to solve this problem. Summary of the Invention

[0007] The purpose of this invention is to provide an adjustable gap osteotomy block to solve the problems raised in the prior art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: it includes a bone cutting block body, the bone cutting block body is integrally formed from medical stainless steel, a floating bone cutting base plate is installed at the bottom of the bone cutting block body through an adjustment mechanism, the floating bone cutting base plate is set perpendicular to the bone cutting block body, and a numerical display screen is installed on the side of the bone cutting block body away from the floating bone cutting base plate. The adjustment mechanism includes a micro servo motor, the output shaft of which is fixedly mounted with an adjustment screw. An internal threaded ring is threaded onto the adjustment screw, and an adjustment tube is fixedly mounted on the outer side of the internal threaded ring. The bottom of the adjustment tube is fixedly connected to the top of the floating osteotomy base plate. A connecting groove is provided at the bottom of the floating osteotomy base plate, and a high-precision displacement sensor is installed in the connecting groove. The detection end of the high-precision displacement sensor is at the same level as the bottom of the floating osteotomy base plate.

[0009] As a preferred technical solution, the adjustment mechanism further includes an installation groove formed on the side of the osteotomy block body, an installation sleeve fixedly installed on the inner wall of the installation groove, a sliding groove formed on the inner wall of the installation sleeve, a slider slidably installed in the sliding groove, and the side of the slider extending out of the sliding groove and fixedly connected to the outer side of the installation sleeve.

[0010] As a preferred technical solution, the number of the sliding grooves is multiple, and the multiple sliding grooves are evenly and circumferentially arranged on the inner wall of the mounting sleeve. A gap is left between the top inner wall of the sliding groove and the top of the mounting sleeve, and a gap is left between the bottom inner wall of the sliding groove and the bottom of the mounting sleeve.

[0011] As a preferred technical solution, multiple mounting plates are fixedly installed on the inner wall of the mounting groove, and the multiple mounting plates are connected to the micro servo motor by screws.

[0012] As a preferred technical solution, a groove is provided on the side of the osteotomy block body, and a power supply and a wireless module are installed in the groove. The power supply is connected to the wireless module and a micro servo motor, and a sealing plate is detachably installed on the groove.

[0013] As a preferred technical solution, the numerical display screen is tilted, and the mounting sleeve, adjusting tube, adjusting screw and micro servo motor are all tilted in the same direction.

[0014] As a preferred technical solution, a fixing plate is fixedly installed on the side of the osteotomy block body above the floating osteotomy base plate, and a gap is left between the fixing plate and the floating osteotomy base plate.

[0015] As a preferred technical solution, an upper osteotomy guide groove is provided on the side of the osteotomy block body, and a lower osteotomy guide groove is provided on the other side of the osteotomy block body.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention features a floating osteotomy baseplate that automatically descends and, in conjunction with a high-precision displacement sensor, directly acquires the actual femoral space, eliminating the need for repeated measurements with a space gauge. It automatically outputs digital baseline reference values, avoiding subjective errors from manual visual inspection, shortening the joint cavity exposure time, and reducing the risk of postoperative infection and soft tissue adhesion.

[0017] This invention differs from existing purely manual sliding adjustment methods. Doctors can directly input the target value through the accompanying operating host, and the device will automatically position itself with stepless high-precision adjustment, reducing the reliance on doctors' experience in surgery and improving the homogenization of unicompartmental surgery.

[0018] The osteotomy block of this invention has a dedicated numerical display screen on the inclined surface of the main body for synchronously displaying gap data. It has good overall sealing performance and is resistant to sterilization. Doctors can quickly read the real-time gap by simply looking down, providing objective digital decision-making basis. It is suitable for complex deformity cases such as genu varum and genu valgum, bone defects and so on.

[0019] The operating host of this invention is placed outside the operating table, and only the main body of the small osteotomy block enters the joint cavity without occupying the surgical field of view; the main body of the osteotomy block eliminates the need for external pads of various sizes, reduces scattered instruments, simplifies the storage and management of the operating room, and avoids the problems of lost pads and confusion of sizes. Attached Figure Description

[0020] Figure 1 This is a perspective view of the invention from a first-person perspective; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a perspective view of the invention from a second viewpoint; Figure 4 This is a perspective view of the groove of the present invention after it has been opened; Figure 5 This is a schematic diagram of the adjustment mechanism of the present invention; Figure 6 This is a schematic diagram of the structure of the mounting sleeve, adjusting tube, and internal threaded ring of the present invention after being cut open. Figure 7 This is a schematic diagram of the structure connecting the mounting sleeve, slider, internal threaded ring, and adjusting screw of the present invention.

[0021] In the diagram: 1. Main body of osteotomy block; 2. Upper osteotomy guide groove; 3. Fixation plate; 4. Floating osteotomy base plate; 5. High-precision displacement sensor; 6. Lower osteotomy guide groove; 7. Mounting groove; 8. Mounting sleeve; 9. Adjustment tube; 10. Numerical display screen; 11. Sealing plate; 12. Groove; 13. Power supply; 14. Adjustment screw; 15. Screw; 16. Miniature servo motor; 17. Mounting plate; 18. Internal threaded ring; 19. Slider; 20. Slide groove. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example: Figures 1-7 As shown, the present invention provides a technical solution for an adjustable gap osteotomy block, including an osteotomy block body 1. The osteotomy block body 1 is integrally formed from medical stainless steel. A floating osteotomy base plate 4 is installed at the bottom of the osteotomy block body 1 through an adjustment mechanism. The floating osteotomy base plate 4 is set perpendicular to the osteotomy block body 1. A numerical display screen 10 is installed on the side of the osteotomy block body 1 away from the floating osteotomy base plate 4. The adjustment mechanism includes a micro servo motor 16. An adjustment screw 14 is fixedly mounted on the output shaft of the micro servo motor 16. An internal threaded ring 18 is threaded onto the adjustment screw 14. An adjustment tube 9 is fixedly mounted on the outer side of the internal threaded ring 18. The bottom of the adjustment tube 9 is fixedly connected to the top of the floating osteotomy base plate 4. A connecting groove is provided at the bottom of the floating osteotomy base plate 4, and a high-precision displacement sensor 5 is installed in the connecting groove. The detection end of the high-precision displacement sensor 5 is at the same horizontal plane as the bottom of the floating osteotomy base plate 4. The rotation of the output shaft of the micro servo motor 16 drives the adjustment screw 14 to rotate. Because the outer side of the mounting sleeve 8 is fixedly connected to the inner wall of the mounting groove 7, the adjustment tube 9 can only slide back and forth in the direction of the sliding groove 20. Therefore, the rotation of the adjustment screw 14 drives the internal threaded ring 18 to move downwards, and the movement of the internal threaded ring 18 drives the adjustment tube 9 to move downwards, thereby causing the floating osteotomy base plate 4 to extend downwards slowly and uniformly until the high-precision displacement sensor 5 on the bottom surface of the floating osteotomy base plate 4 is completely in contact with the femoral condyle surface.

[0024] like Figure 6 and Figure 7 As shown, the adjustment mechanism also includes a mounting groove 7 located on the side of the osteotomy block body 1. A mounting sleeve 8 is fixedly mounted on the inner wall of the mounting groove 7. A sliding groove 20 is provided on the inner wall of the mounting sleeve 8. A slider 19 is slidably mounted in the sliding groove 20. The side of the slider 19 extends out of the sliding groove 20 and is fixedly connected to the outer side of the mounting sleeve 8. The slider 19 and the sliding groove 20 are used to limit the mounting sleeve 8 and the adjustment tube 9, so that they can only slide relative to each other.

[0025] like Figure 6 As shown, there are multiple sliding grooves 20, which are evenly and circumferentially arranged on the inner wall of the mounting sleeve 8. A gap is left between the top inner wall of the sliding groove 20 and the top of the mounting sleeve 8, and a gap is left between the bottom inner wall of the sliding groove 20 and the bottom of the mounting sleeve 8. The arrangement of multiple sliding grooves 20 facilitates stable up-and-down movement of the internal threaded ring 18, and prevents the internal threaded ring 18 from detaching from the mounting sleeve 8.

[0026] like Figure 5 As shown, multiple mounting plates 17 are fixedly installed on the inner wall of the mounting slot 7, and the multiple mounting plates 17 are connected to the micro servo motor 16 by screws 15. The cooperation of the mounting plates 17 and screws 15 facilitates the fixation of the micro servo motor 16.

[0027] like Figure 3 and Figure 4 As shown, a groove 12 is provided on the side of the osteotomy block body 1. A power supply 13 and a wireless module are installed in the groove 12. The power supply 13 is connected to the wireless module and the micro servo motor 16. A sealing plate 11 is detachably installed on the groove 12. The power supply 13 can supply power to the wireless module and the micro servo motor 16, and the sealing plate 11 can seal the groove 12.

[0028] like Figure 3 As shown, the numerical display screen 10 is tilted, and the mounting sleeve 8, adjusting tube 9, adjusting screw 14, and micro servo motor 16 are all tilted in the same direction. The numerical display screen 10 and the mounting sleeve 8 have different tilt directions, and the tilted setting of the numerical display screen 10 facilitates observation by surgical personnel.

[0029] like Figure 1 As shown, a fixing plate 3 is fixedly installed on the side of the osteotomy block body 1, above the floating osteotomy base plate 4. The side of the fixing plate 3 has a clearance hole corresponding to the mounting groove 7. The outer side of the mounting sleeve 8 is fixedly installed on the inner wall of the clearance hole, and a gap is left between the fixing plate 3 and the floating osteotomy base plate 4. The clearance hole is used to allow the inclined mounting sleeve 8 to pass.

[0030] like Figure 1 As shown, an upper osteotomy guide groove 2 is provided on the side of the osteotomy block body 1, and a lower osteotomy guide groove 6 is provided on the other side of the osteotomy block body 1. Through the setting of the upper osteotomy guide groove 2 and the lower osteotomy guide groove 6, a dual-plane osteotomy of the distal femur and the anterior and posterior condyles can be performed sequentially. Working principle of the invention: This application can be used in conjunction with an operating host. The operating host is connected to the numerical display screen 10. The operating host is a desktop independent control device, placed next to the operating table, and undertakes all command input, data calculation and motion control functions. It includes: an industrial control motherboard, a physical button operation panel, a host built-in display screen, a wireless transceiver base station, a local data storage module, and an audible and visual alarm module.

[0031] The control panel is equipped with dedicated physical function buttons, including a gap detection start button, a target value confirmation button, a lifting start / stop button, and a system reset button. The screen touch can be used to input the required values. The wireless transceiver base station is paired with the wireless module of the osteotomy block body 1 to form a network, realizing long-distance wireless signal transmission without cable obstruction of the surgical field of view; The control motherboard receives the sensing data from the high-precision displacement sensor 5, and calculates the actual flexion-extension gap value of the femur by combining it with the equipment's reference thickness. On the one hand, the complete set of data is displayed on the host screen, and on the other hand, the gap value is wirelessly sent to the value display screen 10 on the side wall of the osteotomy block body 1 for local real-time refresh. The local data storage module automatically records surgical parameters such as each detection gap, target height setting, and base plate lifting stroke, and supports the export of clinical data to an external terminal after surgery. The audible and visual alarm module has a built-in lifting safety threshold program. When the input adjustment value exceeds the lifting safety stroke of the floating osteotomy base plate 4, the host will issue an audible and visual warning and simultaneously issue a stop command. The micro servo motor 16 will refuse to perform the lifting action. The numerical display screen 10 has a numerical display function. A high-precision displacement sensor 5 is installed at the bottom of the floating osteotomy base plate 4. The micro servo motor 16 is arranged inside the osteotomy block body 1, without obstructing the intraoperative operating view. The complete operation steps during the operation are as follows: Step 1: Fit the main body 1 of the osteotomy block to the femoral condyle bone to complete the initial positioning; The doctor sends out detection and control signals by operating the wireless transceiver base station inside the host computer. After the wireless module of the osteotomy block body 1 receives the signal, it controls the output shaft of the internal micro servo motor 16 to rotate. The rotation of the output shaft of the micro servo motor 16 drives the adjusting screw 14 to rotate. Since the outer side of the mounting sleeve 8 is fixedly connected to the inner wall of the mounting groove 7, the adjusting tube 9 can only slide back and forth in the direction of the slide groove 20. Therefore, the rotation of the adjusting screw 14 drives the internal thread ring 18 to move down. The movement of the internal thread ring 18 drives the adjusting tube 9 to move down, so that the floating osteotomy base plate 4 extends downward slowly at a uniform speed until the high-precision displacement sensor 5 on the bottom surface of the floating osteotomy base plate 4 is completely in contact with the femoral condyle bone surface. The high-precision displacement sensor 5 collects the stroke data of the floating osteotomy base plate 4 extending outwards, and uploads it to the host via wireless transmission. The host calculates the patient's actual flexion-extension gap during the operation, and then wirelessly transmits the value back to the numerical display screen 10 on the side wall of the osteotomy block body 1 for fixed display, which serves as the basic reference value for the doctor's surgical planning, without the need for manual measurement using an additional gap ruler.

[0032] Step 2: Input the target value into the host computer, and wirelessly send commands to achieve automatic and precise gap adjustment. The value is then dynamically displayed on the screen of display screen 10. The doctor, in conjunction with the original gap and the standard fitting range of the unicompartment prosthesis displayed on the numerical display screen 10 on the main body of the osteotomy block 1, inputs the target lifting height on the operating host and presses the confirmation button; The host computer wirelessly sends the target value and lifting control command to the micro servo motor 16 inside the osteotomy block body 1. The micro servo motor 16 starts the Shudie floating osteotomy base plate 4 to automatically lift and lower to the preset height. Throughout the lifting process, the numerical display screen 10 displays the gap value in real time and refreshes dynamically. After the floating osteotomy plate 4 reaches the preset height, the micro servo motor 16 self-locks to avoid reference deviation caused by intraoperative vibration and bone compression. After the surgery is completed, the wireless connection of the device is turned off; the host machine automatically stores all the gap detection and adjustment parameters of this surgery, which can be exported to an external terminal for case review.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An adjustable-gap osteotomy block, characterized in that: The bone cutting block body (1) is made of medical stainless steel in one piece. A floating osteotomy base plate (4) is installed at the bottom of the bone cutting block body (1) through an adjustment mechanism. The floating osteotomy base plate (4) is set perpendicular to the bone cutting block body (1). A numerical display screen (10) is installed on the side of the bone cutting block body (1) away from the floating osteotomy base plate (4). The adjustment mechanism includes a micro servo motor (16), the output shaft of which is fixedly mounted with an adjustment screw (14). An internal threaded ring (18) is threaded onto the adjustment screw (14), and an adjustment tube (9) is fixedly mounted on the outer side of the internal threaded ring (18). The bottom of the adjustment tube (9) is fixedly connected to the top of the floating osteotomy base plate (4). A connecting groove is provided at the bottom of the floating osteotomy base plate (4), and a high-precision displacement sensor (5) is installed in the connecting groove. The detection end of the high-precision displacement sensor (5) is at the same level as the bottom of the floating osteotomy base plate (4).

2. The adjustable gap osteotomy block according to claim 1, characterized in that: The adjustment mechanism also includes an installation groove (7) opened on the side of the osteotomy block body (1). An installation sleeve (8) is fixedly installed on the inner wall of the installation groove (7). A sliding groove (20) is opened on the inner wall of the installation sleeve (8). A slider (19) is slidably installed in the sliding groove (20). The side of the slider (19) extends to the outside of the sliding groove (20) and is fixedly connected to the outer side of the adjustment tube (9).

3. The adjustable gap osteotomy block according to claim 2, characterized in that: The number of the slide grooves (20) is multiple, and the multiple slide grooves (20) are evenly and circumferentially arranged on the inner wall of the mounting sleeve (8). The top inner wall of the slide groove (20) is left with a gap from the top of the mounting sleeve (8), and the bottom inner wall of the slide groove (20) is left with a gap from the bottom of the mounting sleeve (8).

4. The adjustable gap osteotomy block according to claim 2, characterized in that: Multiple mounting plates (17) are fixedly installed on the inner wall of the mounting slot (7), and the multiple mounting plates (17) are connected to the micro servo motor (16) by screws (15).

5. The adjustable gap osteotomy block according to claim 1, characterized in that: The main body (1) of the osteotomy block has a groove (12) on its side. A power supply (13) and a wireless module are installed in the groove (12). The power supply (13) is connected to the wireless module and the micro servo motor (16). A sealing plate (11) is detachably installed on the groove (12).

6. The adjustable gap osteotomy block according to claim 2, characterized in that: The numerical display screen (10) is tilted, and the mounting sleeve (8), adjusting tube (9), adjusting screw (14) and micro servo motor (16) are all tilted and in the same direction.

7. The adjustable gap osteotomy block according to claim 1, characterized in that: The side of the osteotomy block body (1) is fixedly installed with a fixing plate (3) located above the floating osteotomy base plate (4), and there is a gap between the fixing plate (3) and the floating osteotomy base plate (4).

8. The adjustable gap osteotomy block according to claim 1, characterized in that: The osteotomy block body (1) has an upper osteotomy guide groove (2) on one side and a lower osteotomy guide groove (6) on the other side.

Images