A pedicle osteotome capable of measuring bone mass

Abstract

The present invention belongs to the technical field of medical devices and relates to a pedicle osteotome capable of measuring bone mass, which comprises an osteotome body (1). The osteotome body (1) includes a core rod (101). The rear end of the core rod (101) is connected to an inner handle core (115) through a linear bearing (113). A tail end cover (107) is installed at the rear end of the inner handle core (115), and a pressure sensor (114) is arranged between the rear end face of the core rod (101) and the front end face of the tail end cover (107). An outer sleeve (102) is sleeved outside the core rod (101), and a thin-film displacement sensor (109) is pasted in the cavity of the outer sleeve (102). A pressure bead (108) is arranged on the core rod (101). The head pressure ball of the pressure bead (108) contacts the thin-film displacement sensor (109) to provide a signal trigger pressure for the thin-film displacement sensor (109). It can provide the doctor with the bone mass condition of the patient's pedicle screw path during the operation, so that the doctor can judge the amount of bone cement after the pedicle screw is implanted according to the bone mass condition.

Description

Technical Field

[0001] The invention belongs to the technical field of medical instruments and relates to a pedicle opener, in particular to a pedicle opener capable of measuring bone quality. Background Art

[0002] Spinal fixation is the most common surgery in the treatment of spinal surgical diseases. Pedicle screw fixation is required during the operation, and bone cement needs to be injected after screw implantation to improve mechanical stability for patients with osteoporosis.

[0003] With the serious trend of population aging at home and abroad, more and more patients suffer from degenerative spinal diseases with osteoporosis, and the use of pedicle screws combined with bone cement will become more and more common. However, due to the individual differences in the bone quality of clinical patients, the number of trabeculae, pore structure, cortical bone thickness, etc. in the osteoporotic vertebrae of different patients are different, and this will affect the therapeutic effect of bone cement injection. Less bone cement injection will not obtain sufficient biomechanical stability, and more injection will lead to wider diffusion and increase the risk of leakage. At the same time, bone cement causes abnormal increase in the local strength of the pedicle, which will cause stress shielding effect, and then induce local stress concentration in the pedicle, and finally induce pedicle fracture.

[0004] At present, the research on the amount of bone cement used in the spine is mostly focused on vertebroplasty, and is mostly focused on the bone cement leakage and endplate fracture that may be caused by excessive bone cement injection. No in-depth research has been conducted on the individual differences in patients' bone quality and the amount of bone cement used. At the same time, there is currently no portable bone detection device available for surgical operations on the market, and the amount of bone cement used for different patients during surgery is mainly based on the doctor's clinical experience, the injection feel in actual operation, and the observation of CT images after injection.

[0005] Therefore, in view of the defects existing in the above-mentioned prior art, it is necessary to develop a new type of pedicle opener that can measure bone quality. Summary of the invention

[0006] In order to overcome the defects of the prior art, the present invention proposes a pedicle opener that can measure bone quality. The pedicle opener can measure the work done by external force when the pedicle screw channel is established, and provide the doctor with the bone condition of the patient's pedicle screw channel during the operation, so that the doctor can judge the amount of bone cement after pedicle screw implantation according to the bone condition.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A pedicle osteotome capable of measuring bone mass, which comprises an osteotome body. It is characterized in that the osteotome body includes a core rod, the rear end of the core rod is connected to the inner core of the handle through a linear bearing, a tail end cover is installed at the rear end of the inner core of the handle, and a pressure sensor is arranged between the rear end face of the core rod and the front end face of the tail end cover. An outer sleeve is sleeved outside the core rod, and a thin-film displacement sensor is pasted in the cavity of the outer sleeve. A pressure glass bead is arranged on the core rod, and the head pressure ball of the pressure glass bead contacts the thin-film displacement sensor to provide a signal trigger pressure for the thin-film displacement sensor.

[0009] Preferably, the pedicle osteotome capable of measuring bone mass further includes a main controller. The displacement sensor data line of the thin-film displacement sensor and the pressure sensor data line of the pressure sensor are both connected to the main controller, so that the main controller can read the displacement data of the thin-film displacement sensor and the pressure data of the pressure sensor.

[0010] Preferably, the pedicle osteotome capable of measuring bone mass further includes a host computer. The main controller sends the displacement data and pressure data to the host computer through a serial port. The host computer calculates the integral area of the pressure-displacement curve based on the displacement data and pressure data, obtains the work done by the external force when establishing the pedicle screw path, and thus judges the bone mass condition of the patient.

[0011] Preferably, a first spring is sleeved on the front end of the core rod. The first spring is pushed between the core rod and the outer sleeve, so that the core rod and the outer sleeve return to the zero position in the non-use state.

[0012] Preferably, a second spring is sleeved on the rear end of the core rod. The second spring is pushed between the core rod and the linear bearing, so that the rear end face of the core rod and the pressure sensor are in a non-contact state in the non-use state.

[0013] Preferably, the osteotome body further includes a first wire clip. The first wire clip is connected to the outer sleeve through a buckle and is used to fix the tail wiring board of the thin-film displacement sensor.

[0014] Preferably, the osteotome body further includes a second wire clip. The second wire clip is fixedly connected to the core rod through a positioning pin and is used to fix the displacement sensor data line of the thin-film displacement sensor to prevent the displacement sensor data line from swinging randomly.

[0015] Preferably, a data line fixing clip is arranged in the second wire clip and is used to clamp the displacement sensor data line to prevent it from moving freely.

[0016] Preferably, a spherical handle is sleeved outside the inner core of the handle for hand gripping, and a wire opening is provided on the spherical handle for leading out the data lines of the displacement sensor and the pressure sensor.

[0017] Preferably, a puncture scale indication mark is provided on the outer sleeve.

[0018] Compared with the prior art, the pedicle opener capable of measuring bone quality of the present invention has one or more of the following beneficial technical effects:

[0019] 1. The pedicle opener of the present invention is designed with a puncture displacement measurement structure and a puncture pressure measurement structure, and can measure and collect puncture displacement and puncture pressure in real time during the operation.

[0020] 2. The present invention can collect the pressure-displacement curve during the puncture process of the pedicle screw channel during the operation, calculate the integral area of the pressure-displacement curve, obtain the work done in the process, and thus judge the bone quality of the patient.

[0021] 3. The present invention can effectively improve the quality of spinal surgery, solve the problem of judging the amount of bone cement during the operation by experience at present, realize scientific and quantitative judgment of the amount of bone cement during the operation according to individual differences, has reliable practical value, and is beneficial to the effective, rapid and safe progress of the operation.

[0022] 4. The pedicle opener of the present invention can set a displacement warning value, evaluate and set the nail channel length value in combination with CT images before the operation, and the instrument can give a prompt alarm when the puncture reaches the specified depth during the operation, so as to ensure the accuracy of the puncture nail channel.

[0023] 5. The head of the pedicle opener of the present invention can provide various opening styles such as curved-wide, curved-narrow, straight, etc., and can meet various clinical needs of doctors. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an axonometric view of the pedicle opener capable of measuring bone quality of the present invention;

[0025] Figure 2 is an axonometric view of the opener body of the pedicle opener capable of measuring bone quality of the present invention;

[0026] Figure 3 is a sectional view of the opener body of the pedicle opener capable of measuring bone quality of the present invention;

[0027] Figure 4 is Figure 3 a magnified view of a part of

[0028] Figure 5 is Figure 3An enlarged view of another part for more clearly showing its internal structure. Detailed implementation manners

[0029] Before detailing any embodiments of the present invention, it should be understood that the present invention is not limited in its application to the details of the construction and arrangement of components set forth in the following description or illustrated in the following drawings. The present invention is capable of other embodiments and of being practiced or carried out in various ways. Additionally, it should be understood that the language and terminology used herein are for the purpose of description and should not be regarded as restrictive. As used herein, the terms "comprising", "having" and their variants are intended to cover the listed items and their equivalents as well as additional items. Unless otherwise specified or limited, the terms "mounted", "connected", "supported" and "coupled" and their variants are used broadly and cover both direct and indirect mounting, connection, support and coupling. Further, "connected" and "coupled" are not limited to physical or mechanical connection or coupling.

[0030] And, on the one hand, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention; on the other hand, the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of this element can be multiple. The term "a" should not be construed as limiting the quantity.

[0031] Due to individual differences in bone quality, when forming the same pedicle screw path, different bone qualities consume different amounts of energy. Conversely, by using this phenomenon, the individual bone quality differences can be judged by measuring the work done during the establishment of the pedicle screw path. The present invention utilizes this principle. By measuring the work done by the external force during the establishment of the pedicle screw path, the bone quality condition of the patient's pedicle screw path is provided for the doctor during the operation, so that the doctor can judge the amount of bone cement to be used after the pedicle screw is implanted according to the bone quality condition. This can effectively improve the quality of spinal surgery, solve the problem of judging the amount of bone cement by experience during the current operation, realize scientific and quantitative judgment of the amount of bone cement during the operation for individual differences, has reliable practical value, and is conducive to the effective, rapid and safe progress of the operation.

[0032] Figure 1 An isometric view of the pedicle opener capable of measuring bone quality according to the present invention is shown. As Figure 1As shown in the figure, the pedicle osteotome capable of measuring bone mass according to the present invention includes an osteotome body 1. The osteotome body 1 is used to establish a pedicle screw channel, and the osteotome body 1 can measure the displacement and pressure during the establishment of the pedicle screw channel, so as to facilitate the calculation of the external work done during the establishment of the pedicle screw channel, and further provide the doctor with the bone mass condition of the patient's pedicle screw channel during the operation, so that the doctor can judge the amount of bone cement after the pedicle screw is implanted according to the bone mass condition.

[0033] As Figures 2 - 5 shown in the figure, the osteotome body 1 includes a core rod 101. The core rod 101 is used to puncture the pedicle during the establishment of the pedicle screw channel.

[0034] In the present invention, the head of the core rod 101 can provide various osteotomy styles such as curved-wide, curved-narrow, straight, etc., so as to meet various clinical needs of doctors.

[0035] The rear end of the core rod 101 is connected to the inner core 115 of the handle through a linear bearing 113, so that the core rod 101 can axially slide along the linear bearing 113.

[0036] A tail end cap 107 is installed at the rear end of the inner core 115 of the handle, and a pressure sensor 114 is provided between the rear end face of the core rod 101 and the front end face of the tail end cap 107. The tail end cap 107 is used to press the pressure sensor 114. The pressure sensor 114 is used to measure the pressure value when the core rod 101 punctures the pedicle.

[0037] Preferably, a second spring 112 is sleeved on the rear end of the core rod 101. The two ends of the second spring 112 respectively abut against the core rod 101 and the linear bearing 113, so that the rear end face of the core rod 101 and the pressure sensor 14 are in a non-contact state in the non-use state.

[0038] An outer sleeve 102 is sleeved on the outside of the core rod 101, and a thin film displacement sensor 109 is pasted in the cavity of the outer sleeve 102. The thin film displacement sensor 109 is used to measure the relative sliding displacement between the core rod 101 and the outer sleeve 102 when the core rod 101 punctures the pedicle.

[0039] Preferably, a first spring 110 is sleeved on the front end of the core rod 101. The two ends of the first spring 110 respectively abut against the core rod 101 and the outer sleeve 102, so that the core rod 101 and the outer sleeve 102 return to the zero position in the non-use state.

[0040] A pressure bead 108 is provided on the core rod 101. The head pressure ball of the pressure bead 108 contacts the thin film displacement sensor 109, so as to provide a signal triggering pressure for the thin film displacement sensor 109.

[0041] Preferably, the pressure bead 108 is installed on the core rod 101 by means of a thread, so that the pressure bead 108 can be better fixed on the core rod 101.

[0042] Continuing to refer to Figure 1 , the pedicle opener capable of measuring bone mass of the present invention further includes a main controller 2. The main controller can be an STM32 single-chip microcomputer.

[0043] The displacement sensor data line 111 of the thin film displacement sensor 109 and the pressure sensor data line 117 of the pressure sensor 114 are both connected to the main controller 2, so that the main controller 2 can read the displacement data of the thin film displacement sensor 109 and the pressure data of the pressure sensor 114.

[0044] In addition, although not shown in the drawings, the pedicle opener capable of measuring bone mass of the present invention further includes a host computer. The main controller 2 can send the displacement data and pressure data to the host computer through a serial port. Thus, the host computer can fuse the displacement data and pressure data to form a pressure-displacement curve and calculate the integral area of the pressure-displacement curve, so as to obtain the work done by the external force during the establishment of the pedicle screw path, and further judge the bone mass condition of the patient.

[0045] Among them, fusing the displacement data and pressure data to form a pressure-displacement curve and calculating the integral area of the pressure-displacement curve, and obtaining the work done by the external force based on the integral area, this belongs to the prior art. For the sake of simplicity, it will not be described in detail here.

[0046] In this way, the pedicle opener of the present invention is designed with a puncture displacement measurement structure and a puncture pressure measurement structure, which can measure and collect the puncture displacement and puncture pressure in real time during the operation. Moreover, the pressure-displacement curve during the puncture process of the pedicle screw path can be collected during the operation, and the integral area of the pressure-displacement curve can be calculated to obtain the work done in the process, so as to judge the bone mass condition of the patient. Thus, the present invention can effectively improve the quality of spinal surgery, solve the problem of judging the amount of bone cement during the operation by experience at present, realize scientific and quantitative judgment of the amount of bone cement during the operation for individual differences, has reliable practical value, and is conducive to the effective, rapid and safe progress of the operation.

[0047] In the present invention, preferably, the opener body 1 further includes a first wire clamp 104. The first wire clamp 104 is connected to the outer sleeve 102 through a buckle 119 and is used to fix the tail wiring board of the thin-film displacement sensor 109.

[0048] More preferably, a fixing clamp is provided in the first wire clamp 104 for clamping the displacement sensor data line 111 to prevent it from moving freely.

[0049] In addition, preferably, the opener body 1 further includes a second wire clamp 105. The second wire clamp 105 is fixedly connected to the core rod 101 through a positioning pin 116 and is used to fix the displacement sensor data line 111 of the thin-film displacement sensor 109 to prevent the displacement sensor data line 111 from swaying randomly.

[0050] More preferably, the displacement sensor data line 111 is spirally stored in the second wire clamp 105, so that the displacement sensor data line 111 can be axially extended and stored along the core rod 101 when the core rod 101 and the outer sleeve 102 slide relative to each other.

[0051] Still more preferably, a data line fixing clamp 118 is provided in the second wire clamp 105 for clamping the displacement sensor data line 111 to prevent it from moving freely.

[0052] Moreover, annular textures are designed on the outer surface of the second wire clamp 105 for the index finger to press and exert force during puncture.

[0053] In the present invention, a spherical handle 106 is sleeved outside the inner core 115 of the handle for the palm to hold. And, a wire opening is provided on the spherical handle 106 for leading out the displacement sensor data line 111 and the pressure sensor data line 117 to facilitate connection to the main controller 2.

[0054] Finally, preferably, a puncture scale indication mark 103 is provided on the outer sleeve 102. Through the puncture scale indication mark 103, the puncture depth can be displayed to facilitate grasping the puncture situation.

[0055] Furthermore, before the operation, the length value of the pedicle screw path can be evaluated and set in combination with CT images, and a displacement warning value can be set according to the screw path length value. When the puncture reaches the specified depth during the operation (obtained through the thin-film displacement sensor 109), the upper computer can give a prompt alarm, thereby realizing precise puncture.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Those skilled in the art can modify or equivalently replace the technical solutions of the present invention according to the idea of the present invention, without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A pedicle opener capable of measuring bone quality, comprising an opener body (1), characterized in that: The circuit breaker body (1) comprises a core rod (101), the rear end of the core rod (101) is connected to a handle inner core (115) via a linear bearing (113), the rear end of the handle inner core (115) is installed with a tail end cover (107), and a pressure sensor (114) is provided between the rear end face of the core rod (101) and the front end face of the tail end cover (107), the outer side of the core rod (101) is sleeved with an outer sleeve (102), and a thin film displacement sensor (109) is pasted in the cavity of the outer sleeve (102), and a pressure glass bead (108) is provided on the core rod (101), and the pressure ball at the head of the pressure glass bead (108) contacts the thin film displacement sensor (109) to provide pressure to the thin film displacement sensor (109). 109) provides a signal triggering pressure; further comprising a main controller (2), the displacement sensor data line (111) of the thin film displacement sensor (109) and the pressure sensor data line (117) of the pressure sensor (114) are both connected to the main controller (2), so that the main controller (2) can read the displacement data of the thin film displacement sensor (109) and the pressure data of the pressure sensor (114); further comprising a host computer, the main controller (2) sends the displacement data and the pressure data to the host computer through a serial port, and the host computer calculates the integral area of ​​the pressure displacement curve based on the displacement data and the pressure data, and obtains the work done by the external force when the pedicle screw track is established, thereby judging the patient's bone condition; A first spring (110) is sleeved on the front end of the core rod (101), and the first spring (110) pushes between the core rod (101) and the outer sleeve (102), so that the core rod (101) and the outer sleeve (102) return to a zero position when not in use; A second spring (112) is sleeved on the rear end of the core rod (101), and the second spring (112) pushes between the core rod (101) and the linear bearing (113), so that the rear end surface of the core rod (101) and the pressure sensor (114) are in a non-contact state when not in use.

2. The pedicle opener capable of measuring bone quality according to claim 1, characterized in that: The circuit breaker body (1) further comprises a first wire clamp (104), the first wire clamp (104) being connected to the outer sleeve (102) via a buckle (119) and being used for fixing a tail terminal board of the thin film displacement sensor (109).

3. The pedicle opener capable of measuring bone quality according to claim 2, characterized in that: The circuit breaker body (1) further comprises a second wire clamp (105), the second wire clamp (105) being fixedly connected to the core rod (101) via a positioning pin (116) and being used for fixing the displacement sensor data wire (111) of the thin film displacement sensor (109) to prevent the displacement sensor data wire (111) from swinging randomly.

4. The pedicle opener capable of measuring bone quality according to claim 3, characterized in that: The second wire clamp (105) is provided with a data wire fixing clamp (118) for clamping the displacement sensor data wire (111) to prevent it from moving freely.

5. The pedicle opener capable of measuring bone quality according to claim 4, characterized in that: The outer side of the handle inner core (115) is provided with a spherical handle (106) for being held by the palm of the hand, and the spherical handle (106) is provided with a wire opening for leading out the displacement sensor data wire (111) and the pressure sensor data wire (117).

6. The pedicle opener capable of measuring bone quality according to claim 5, characterized in that: The outer sleeve (102) is provided with a puncture scale indicator mark (103).

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