Medical tool bit and ultrasonic osteotome

Abstract

The utility model discloses a medical tool bit and an ultrasonic osteotome, and relates to the technical field of medical instruments, and the medical tool bit comprises a tool bit main body; the connecting part is arranged at one end of the tool bit body, external threads are arranged on the periphery of the connecting part, the external threads are used for being connected with a driving handle, and a rounded corner structure is arranged at the tooth bottom of the external threads. According to the technical scheme, the possibility that the tool bit is damaged is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a medical scalpel tip and an ultrasonic bone scalpel. Background Technology

[0002] An ultrasonic bone scalpel typically consists of a disposable medical blade and a reusable drive handle. For ease of assembly and disassembly, the medical blade and drive handle are connected by a threaded connection.

[0003] There is a type of ultrasonic bone scalpel with a standard M4 external thread at the tail end. It is assembled with the drive handle through this M4 external thread. However, during the life test, it was found that the thread broke, causing the scalpel head to be damaged. Utility Model Content

[0004] The main purpose of this invention is to provide a medical scalpel tip and an ultrasonic bone scalpel, which aims to reduce the possibility of scalpel tip damage.

[0005] To achieve the above objectives, the medical blade proposed in this utility model includes:

[0006] The main body of the cutter head; and

[0007] A connecting part is provided at one end of the cutter head body. The outer periphery of the connecting part is provided with an external thread. The external thread is used to connect the drive handle. The root of the external thread is provided with a rounded corner structure.

[0008] In one embodiment, the nominal diameter of the external thread is 4mm to 8mm, and the pitch is 0.7mm to 1.25mm.

[0009] In one embodiment, the radius of the rounded corner structure is 0.15 ± 0.05 mm.

[0010] In one embodiment, the external thread is a coarse-pitch ordinary thread.

[0011] In one embodiment, the manufacturing tolerance of the external thread is no greater than 6g or 6h.

[0012] In one embodiment, the cutter head body includes:

[0013] The blade portion, wherein the connecting portion is located at one end of the blade portion; and

[0014] The blade head is located at the end of the blade portion away from the connecting portion, and / or on the side of the blade portion.

[0015] In one embodiment, the tool head includes at least one of a cutting head and a grinding head.

[0016] In one embodiment, the blade portion includes a first segment and a second segment connected to each other, the first segment being connected to the connecting portion and having an outer diameter larger than that of the connecting portion, and the second segment being plate-shaped or rod-shaped.

[0017] In one embodiment, the blade body is provided with a liquid injection channel, and the outer peripheral wall of the blade body is provided with a coolant tank. One end of the coolant tank is connected to the liquid injection channel, and the other end of the coolant tank extends toward the blade head.

[0018] This utility model also proposes an ultrasonic bone scalpel, comprising:

[0019] Drive handle; and

[0020] The aforementioned medical blade has a drive handle that is threadedly connected to the external thread.

[0021] The medical blade tip of this utility model includes a blade body and a connecting part, which is connected to the drive handle by a threaded connection. The outer periphery of the connecting part is provided with an external thread, and the root of the external thread has a rounded corner structure, which makes the root of the external thread smoothly transition, reduces stress concentration at the root of the external thread, improves the strength of the connecting part, reduces the possibility of damage to the connecting part, and thus extends the service life of the medical blade tip. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the thread structure of a medical blade in the background art;

[0024] Figure 2 A schematic diagram of the connecting part of the medical blade provided by this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the medical blade provided by this utility model.

[0026] Explanation of icon numbers:

[0027] 100. Connecting part; 101. Rounded corner structure;

[0028] 200. Cutter head body; 210. Cutter body; 211. First section; 212. Second section; 2101. Coolant tank; 220. Cutter head;

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection, a direct connection or an indirect connection through an intermediate medium, or a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] This utility model proposes a medical scalpel tip.

[0035] Please see Figures 1 to 3 , Figure 1This is a schematic diagram of the thread structure of a medical blade in the background art. Figure 2 This is a schematic diagram of the connecting part of the medical blade tip provided by this utility model. Figure 3 This is a schematic diagram of the structure of the medical blade provided by this utility model.

[0036] In one embodiment of this utility model, the medical blade includes:

[0037] The cutter head body is 200; and

[0038] The connecting part 100 is located at one end of the cutter head body 200. The outer periphery of the connecting part 100 is provided with an external thread for connecting the drive handle. The root of the external thread is provided with a rounded corner structure 101.

[0039] The medical blade tip of this utility model includes a blade body 200 and a connecting part 100, which is connected to the drive handle by a threaded connection. The connecting part 100 has an external thread on its outer periphery, and the root of the external thread has a rounded corner structure 101, which makes the root of the external thread smoothly transition, reduces stress concentration at the root of the external thread, improves the strength of the connecting part 100, reduces the possibility of damage to the connecting part 100, and thus extends the service life of the medical blade tip.

[0040] In one embodiment, the nominal diameter of the external thread is 4 mm to 8 mm;

[0041] The pitch is 0.7mm to 1.25mm.

[0042] In the embodiments of this utility model, the maximum diameter of the thread ranges from 4 mm to 8 mm, i.e., the nominal diameter is 4 mm to 8 mm, for example: 4 mm, 6 mm, 8 mm, etc. The pitch is 0.7 mm to 1.25 mm, for example: 0.7 mm, 1 mm, 1.25 mm, etc. External threads within this size range easily mate with drive handles, meeting connection requirements for different sizes and strengths. Specifically, in this embodiment, the external thread, except for the fillet structure 101 at the root, adopts the national standard M4 external thread size, with a nominal diameter of 4 mm and a pitch of 0.7 mm, facilitating mass production and quality control, and also facilitating docking and assembly with drive handles.

[0043] In one embodiment, the radius of the rounded corner structure 101 is 0.15 ± 0.05 mm.

[0044] Reference Figure 2In the embodiments of this utility model, the radius of the rounded corner structure 101 is 0.15±0.05mm, such as 0.15mm, 0.1mm, 0.2mm, etc., to ensure the manufacturing accuracy of the rounded corner structure 101 and allow a certain tolerance to adapt to errors in the production process. It also helps to ensure the consistency of the external thread and reduce the possibility of damage.

[0045] In one embodiment, the external thread is a coarse-pitch ordinary thread.

[0046] In the embodiments of this utility model, the external thread is a coarse-pitch ordinary thread. The coarse-pitch ordinary thread can meet the needs of quick connection and disassembly, provide high connection strength requirements, and is relatively simple to process, which helps to reduce manufacturing costs.

[0047] In one embodiment, the manufacturing tolerance of the external thread is no greater than 6g or 6h.

[0048] In embodiments of this utility model, the external thread can adopt a manufacturing tolerance with tolerance designation g and tolerance grade not greater than 6, such as g6, g4, etc.; the external thread can also adopt a manufacturing tolerance with tolerance designation h and tolerance grade not greater than 6, such as h6, h4, etc. By limiting the manufacturing tolerance of the external thread, the manufacturing accuracy of the external thread and the interchangeability of the medical blade tip are guaranteed.

[0049] In one embodiment, the cutter head body 200 includes:

[0050] The blade portion 210, the connecting portion 100 is provided at one end of the blade portion 210; and

[0051] The blade head 220 is located at the end of the blade body 210 away from the connecting portion 100, and / or on the side of the blade body 210.

[0052] In an embodiment of this utility model, the cutter head body 200 includes a cutter body 210 and a cutter head 220. The cutter head 220 is used for cutting, grinding, milling and other operations. The cutter head 220 can be located at the end of the cutter body 210 away from the connecting part 100, or it can be located on the side of the cutter body 210. It can be designed according to actual needs to meet more diverse usage requirements.

[0053] In one embodiment, the tool head 220 includes at least one of a cutting head and a grinding head.

[0054] In the embodiments of this utility model, the medical blade is mainly used in orthopedic surgery. The blade head 220 can be a cutting head to perform cutting operations on bone tissue, or it can be a grinding head to perform grinding operations on bone tissue.

[0055] In one embodiment, the blade portion 210 includes a first segment 211 and a second segment 212 connected to each other. The first segment 211 is connected to the connecting portion 100 and the outer diameter of the first segment 211 is larger than the outer diameter of the connecting portion 100. The second segment 212 is in the form of a sheet or a rod.

[0056] In an embodiment of this utility model, the blade portion 210 includes a first segment 211 and a second segment 212. The outer diameter of the first segment 211 is larger than the outer diameter of the connecting portion 100. After the connecting portion 100 is connected to the drive handle, the first segment 211 abuts against the drive handle. The larger first segment 211 can provide better support and more effectively transmit the force applied by the drive handle to the blade head 220. The second segment 212 can be in the form of a sheet or a rod, used to set the blade head 220. For example, if the cutting head needs to be relatively sharp, the second segment 212 can be set as a sheet; if the grinding head needs to provide stronger support, the second segment 212 can be set as a rod. The specific shape and size of the second segment 212 can be selected according to different surgical needs, as long as the functional requirements are met.

[0057] In one embodiment, the blade portion 210 is provided with a liquid injection channel, and the outer peripheral wall of the blade portion 210 is provided with a coolant groove 2101. One end of the coolant groove 2101 is connected to the liquid injection channel, and the other end of the coolant groove 2101 extends toward the blade head 220.

[0058] In this embodiment of the invention, in order to cool the medical blade tip during operation and extend its service life, the blade body 210 is also provided with a liquid injection channel and a coolant tank 2101. The coolant flows along the liquid injection channel in the blade body 210 and flows from the coolant tank 2101 on the outer peripheral wall of the blade body 210 to the blade head 220, thereby ensuring the cooling effect on the blade body 210, the blade head 220 and the surgical site, reducing heat accumulation during the operation, extending the service life of the medical blade tip and improving the safety of the operation.

[0059] This utility model also proposes an ultrasonic bone scalpel, comprising:

[0060] Drive handle; and

[0061] The aforementioned medical blade has a drive handle that is threaded to an external thread.

[0062] The specific structure of the medical blade is as described in the above embodiments. Since this ultrasonic bone scalpel adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0063] In this technical solution, the radius of the rounded corner structure 101 was obtained through experimental testing. The specific testing procedure is as follows:

[0064] I. Problem Analysis and Improvement Design

[0065] 1. Problem Discovery

[0066] A lifespan test was conducted on the medical blade tip UQD03407B with production batch number J240501 to test whether it met the 1-hour lifespan requirement. Three samples were tested, and one of them had no efficient output at the 3-minute mark of the lifespan test. After disassembly, it was found that its thread was broken.

[0067] Compared with two other samples that passed the life test, the measurements showed no abnormalities in the thread root diameter, major diameter and other related dimensions. The difference was that the thread root of the failed cutter head had no rounded transition. It was initially judged that the lack of rounded transition at the thread root caused stress concentration, which led to the breakage of the cutter head.

[0068] 2. Verification Issues

[0069] One UQD03407B cutting tool tip was randomly selected for life testing. The production batch number was J240402. The thread root also lacked a rounded transition. There was no efficiency output at the 18th minute of the life test. After disassembling the cutting tool tip, it was found that it was still broken at the thread. Measurements of the thread root diameter, major diameter, and other related dimensions showed no abnormalities.

[0070] This indicates that the thread shape affects the life of the cutting tool, and it is speculated that the solution is to set a rounded corner structure 101 at the root of the thread.

[0071] 3. Improved design

[0072] Fifteen medical blades were obtained, all of which have a rounded corner structure 101 at the root of their threads and meet the requirements of a 1-hour life test.

[0073] The radius of the fillet structure 101 at the root of the thread of these 15 medical blades was measured. After removing some obviously erroneous data, the measurement results are as follows:

[0074]

[0075] The data in the table above is processed according to a plus-minus three sigma range. This plus-minus three sigma range is primarily used for data analysis and quality control. A plus-minus three sigma (3σ) range refers to the range of the data distribution's mean (μ) plus or minus three standard deviations (σ), i.e., μ ± 3σ. Within this range, the cumulative probability of the data is approximately 99.73%, meaning that approximately 99.73% of the data will fall within this range, while the remaining 0.27% will fall outside of it.

[0076] In this scheme, it refers to the mean and standard deviation of the radius of the rounded corner structure 101 calculated based on the data in the table above, under the condition of ensuring a pass rate of 99.73%.

[0077] First, the data in the table above was processed using the "Zhipu Qingyan" AI to obtain the radius design range of the rounded corner structure 101 as 0.143±0.067mm under the condition of a pass rate of 99.73%.

[0078] To ensure the reliability of the calculation, this data was then used to perform formula calculations in an Excel spreadsheet, as shown in the image below:

[0079]

[0080] Under the condition of a pass rate of 99.73%, the radius design range of the rounded corner structure 101 is 0.145±0.06mm.

[0081] Based on the calculation results of the above two methods, in order to facilitate processing and manufacturing, the radius of the integrated rounded corner structure 101 should be 0.15±0.05mm.

[0082] II. Testing and Verification

[0083] To ensure the reasonableness of the radius dimension of the rounded corner structure 101 being 0.15±0.05mm, 19 medical blades conforming to the above-mentioned dimension design were selected for life testing, and the test results were used to verify whether this range was reasonable.

[0084] 1. Analysis of the rationality of sample selection

[0085] First, the radius of the fillet structure 101 at the root of the thread of 19 medical knife tips was measured. After removing some obviously erroneous data, the following data was obtained:

[0086]

[0087]

[0088] The above sample data contains 163 data points. Calculations on the data yielded a mean of 0.149 and a variance of 0.00013.

[0089] The Z-test was then used to confirm whether there was a difference between the sample and the population (mean 0.15, standard deviation 0.05). The calculated Z-score was -0.2553, indicating that there was no significant difference between the sample mean and the population mean. This means that these 19 blades are usable samples and can be used as test samples to verify the fillet radius of 0.15±0.05mm.

[0090] 2. The verification equipment is shown in the table below.

[0091]

[0092]

[0093] 3. The verification environment is shown in the table below.

[0094] Serial Number name numerical values Application Description 1 Place Performance Testing Lab Provide testing sites 2 Ambient temperature 16℃ / 3 Atmospheric pressure 700hPa~1060hPa / 4 relative humidity 52％ / 5 AC rated voltage 220V~50Hz Provide power for equipment operation

[0095] III. Test Results and Data Analysis

[0096] 1. Test Results

[0097] Of the 19 selected samples, one cutter head broke at the cutting edge during the 62-minute life test, while the remaining 18 cutter heads all completed the 90-minute life test.

[0098] 2. Statistical Analysis of Sample Testing

[0099] The service life (cumulative cutting time) of a single cutting head is calculated based on statistical principles, and the specific process is as follows:

[0100] (1) Selection of probability and statistics model

[0101] The final test or inspection result of the cutting head has only two states: qualified and unqualified, with only two possible distributions. According to statistical principles, this test result can be described by the binomial cumulative distribution function. The formula for the binomial cumulative distribution function is as follows:

[0102]

[0103] N represents the number of trials, and P represents the probability of success.

[0104] In statistics, the binomial distribution is a discrete probability distribution used to describe the probability distribution of the number of successful trials in N independent repeated trials. The probability of success in each trial is p, and the probability of failure is q or p_value (q = 1-p). The cumulative distribution function binocdf(x,n,p) of the binomial distribution gives the probability that the random variable takes a specific value or is less than that value. In statistics, if q or p_value < 0.05, the experimental hypothesis is considered valid, the result meets the requirements, and the sample results can be used as the basis for hypothesis testing. In the MATLAB programming environment, the binocdf function can be used to calculate the cumulative distribution function value of the binomial distribution.

[0105] (2) Experimental Hypothesis

[0106] The sample test results showed that one of the 19 selected cutter heads broke at the cutting edge during the 62-minute life test, while the remaining 18 cutter heads all completed the 90-minute life test.

[0107] Based on the test results, assuming that the cumulative life test of the cutter head is 90 minutes, the test is considered successful, and the number of parts that pass the test under this condition is 18.

[0108] In summary, the cumulative distribution function can be represented as binocdf(18,19,α / 90). Experimental results show that the cutter head did not break within 62 minutes. Therefore, it can be assumed that the lifespan of the cutter head is 62min≤α≤90min.

[0109] (3) Verification calculation

[0110] In MATLAB, input the cumulative distribution function code of the binomial distribution to calculate lifetime. The calculation code is shown in the figure below:

[0111]

[0112] The verification results are shown in the figure below, assuming a service life of 76 minutes:

[0113]

[0114] The verification results are shown in the figure below, assuming a service life of 77 minutes:

[0115]

[0116] The verification results from 62 min to 78 min are shown in the table below:

[0117]

[0118]

[0119] As shown in the table above, under the assumed conditions, after the tool tip's lifespan exceeds 77 minutes, the q or p_value is greater than 0.05, indicating that the experimental hypothesis is not valid after the lifespan exceeds 77 minutes. However, between 62 and 76 minutes, all q or p_values ​​are less than 0.05, indicating that the experimental hypothesis is valid and statistically significant between 62 and 76 minutes.

[0120] (4) Statistical Analysis - Summary

[0121] Analysis using this statistical method shows that the cumulative cutting time of a single cutting head is between 62 and 76 minutes, with a maximum lifespan of 76 minutes.

[0122] Secondly, the cumulative cutting time of all the actual test samples was greater than 62 minutes, indicating that the sampling test results met the assumptions, the sample results were highly representative, the test results were valid, and the sample hypothesis test was successful.

[0123] Therefore, designing the radius of the fillet structure 101 at the bottom of the external thread of the cutter head to be 0.15±0.05mm can solve the problem of thread breakage and enable the cutter head to achieve a service life of more than 60 minutes.

[0124] 3. Statistical Analysis of Sample Testing (Part Two)

[0125] To further clarify the actual service life of the samples (cumulative cutting time) and whether the test results meet clinical needs, a t-test statistical analysis was performed on the test results again. The specific process is as follows:

[0126] (1) Selection of probability and statistics model

[0127] Given that the sample size is 19, which is less than 30, a t-test is chosen for hypothesis testing.

[0128] Use a significance level of α = 0.05.

[0129] If the calculated t-value is greater than the critical t-value, reject the null hypothesis and accept the alternative hypothesis. Then, verify the lifespan of the cutter head by making multiple assumptions.

[0130] (2) First experimental hypothesis

[0131] Null hypothesis H0: The design life of the part is no more than 60 minutes;

[0132] Alternative hypothesis H1: The design life of the part is greater than 60 minutes.

[0133] Enter the following information into Zhipu Qingyan for verification: A part is designed to have a lifespan greater than 60 minutes; 19 parts are randomly sampled from a large batch for testing; 18 parts pass the test after 90 minutes, and 1 part fails after 62 minutes; please use hypothesis testing with a significance level of 0.05 to determine whether this batch of parts meets the design requirements. Please calculate the result.

[0134] The calculation process code is shown below:

[0135] import scipy.stats as stats

[0136] #Test Data

[0137] test_times = [90,90,90,90,90,90,90,90,90,90,90,90,90,90,90,90,90,90,90,62] # 18 times 90 minutes, 1 time 62 minutes

[0138] n = len(test_times) # Sample size

[0139] # Calculate the sample mean and sample standard deviation

[0140] mean_time = sum(test_times) / n

[0141] std_dev_time=(sum([(x-mean_time)**2for x in test_times]) / (n-1))**0.5

[0142] #Calculate the t value

[0143] t_value=(mean_time-60) / (std_dev_time / (n**0.5))

[0144] #Find the critical value of the t-distribution, with n-1 degrees of freedom and a significance level of 0.05.

[0145] t_critical=stats.t.ppf(1-0.05,df=n-1)

[0146] mean_time,std_dev_time,t_value,t_critical

[0147] The critical value of the t-distribution is 1.73, and the t-value is 19.36. Since the t-value is greater than the critical t-value, we reject the null hypothesis H0 and accept the alternative hypothesis H1, which means that the design life of the part is greater than 60 minutes.

[0148] (3) Hypothesis of the second experiment

[0149] Null hypothesis H0: The design life of the part is no more than 85 minutes;

[0150] Alternative hypothesis H1: The design life of the part is greater than 85 minutes.

[0151] Using the same code as the first experiment, the critical value of the t-distribution was calculated to be 1.73, and the t-value was 2.39. Since the t-value is greater than the critical t-value, the null hypothesis H0 is rejected, and the alternative hypothesis H1 is accepted, that is, the design life of the part is greater than 85 minutes.

[0152] (4) Third Experiment Hypothesis

[0153] Null hypothesis H0: The design life of the part is no more than 86 minutes;

[0154] Alternative hypothesis H1: The design life of the part is greater than 86 minutes.

[0155] Using the same code as the first experiment, the critical value of the t-distribution was calculated to be 1.73, and the t-value was 1.71. Since the t-value is less than the critical t-value, the null hypothesis H0 cannot be rejected, meaning that the design life of the part is no more than 86 minutes.

[0156] (4) Summary of Statistical Analysis II

[0157] Analysis using this statistical method shows that the cumulative cutting time of a single cutting head is between 62 and 85 minutes, with a maximum lifespan of 85 minutes.

[0158] Secondly, the cumulative cutting time of all the actual test samples was greater than 62 minutes, indicating that the sampling test results met the assumptions, the sample results were highly representative, the test results were valid, and the sample hypothesis test was successful.

[0159] Therefore, designing the radius of the fillet structure 101 at the bottom of the external thread of the cutter head to be 0.15±0.05mm can solve the problem of thread breakage and enable the cutter head to achieve a service life of more than 60 minutes.

[0160] IV. Test Summary

[0161] The M4-6g thread root is equipped with a fillet structure 101. The fillet structure 101 with a radius of R0.15±0.05mm can meet the service life requirement of 60 minutes.

[0162] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A medical cutting head, characterized in that The medical tool head comprises: a tool head body; and a connecting portion provided at one end of the tool head body, an outer periphery of the connecting portion being provided with an external thread, the external thread being used for connecting a driving handle, a root of the external thread being provided with a round corner structure.

2. The medical cutting head of claim 1 wherein, The external thread has a nominal diameter of 4mm-8mm and a pitch of 0.7mm-1.25mm.

3. The medical cutting head of claim 2, wherein, The round corner structure has a radius of 0.15±0.05mm.

4. The medical cutting head of claim 3, wherein, The external thread is a coarse thread normal thread.

5. The medical cutting head of claim 3 wherein, The manufacturing tolerance of the external thread is not greater than 6g or 6h.

6. The medical cutting head of any one of claims 1 to 5, wherein, The tool head body comprises: a tool body portion, the connecting portion being provided at one end of the tool body portion; and a tool head portion provided at an end of the tool body portion away from the connecting portion and / or provided at a side portion of the tool body portion.

7. The medical cutting head of claim 6, wherein, The tool head portion comprises at least one of a cutting head and a grinding head.

8. The medical cutting head of claim 6 wherein, The tool body portion comprises a first segment and a second segment connected to each other, the first segment being connected to the connecting portion and an outer diameter of the first segment being greater than an outer diameter of the connecting portion, the second segment being in a sheet shape or a rod shape.

9. The medical cutting head of claim 6 wherein, The tool body portion is provided with a liquid injection channel, an outer peripheral wall of the tool body portion is provided with a cooling liquid groove, one end of the cooling liquid groove being communicated with the liquid injection channel, and the other end of the cooling liquid groove extending towards the tool head portion.

10. An ultrasonic osteotome characterized by, The medical tool head comprises: a driving handle; and the driving handle is threadedly connected with the external thread according to any one of claims 1-9.

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