CN217310483U

CN217310483U - Ultrasonic scalpel head with composite coating

Info

Publication number: CN217310483U
Application number: CN202220412017.8U
Authority: CN
Inventors: 王磊; 郑少腾; 刘柯; 颜忠余; 骆威
Original assignee: Innolcon Medical Technology Suzhou Co Ltd
Current assignee: Innolcon Medical Technology Suzhou Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-08-30
Anticipated expiration: 2032-02-28

Abstract

The utility model discloses an supersound scalpel tool bit with composite coating, its tool bit includes a main part, and attaches the composite coating in the tool bit main part outside, the tool bit main part is titanium alloy material, composite coating is TiN coating, TiCN coating, DLC coating by interior and outer in proper order. The beneficial effects of the utility model are mainly embodied in that: the existence of the two transition layers can effectively reduce the mismatching relationship between the coatings and form better bonding force; moreover, the specific thickness ratio is adopted among the coatings, so that the film falling caused by excessive concentration of internal stress can be avoided; the combination of the TiN coating, the TiCN coating and the DLC coating realizes high thermal conductivity and high hardness of the ultrasonic scalpel bit.

Description

Ultrasonic scalpel head with composite coating

Technical Field

The utility model relates to the technical field of surgical instruments, in particular to an ultrasonic scalpel bit with a composite coating.

Background

With the rapid development of modern medicine, the ultrasonic surgical instrument is increasingly applied to clinical surgical treatment, and the ultrasonic scalpel is an ultrasonic surgical instrument with a specific application function. The ultrasonic energy is applied to the surgical operation, has the characteristics of fine cutting, safety, tissue selectivity, low-temperature hemostasis and the like, greatly enriches the means of the surgical operation, improves the quality of the surgical operation, and relieves the pain of patients to a certain extent. The ultrasonic scalpel comprises a main body, wherein the proximal end of the main body is provided with a connecting structure, and the distal end is provided with a cutter head, such as the structures disclosed in US8343178, US 667117, US6379371 and European patent EP 3586774.

In the prior art, the material of the ultrasonic scalpel head is generally high-hardness alloy steel, the hardness of the ultrasonic scalpel head is far greater than that of cortical bone, and the tooth profile can be designed to be very sharp. And because the ultrasonic scalpel has internal stress generated by high-frequency vibration, the material selection and the tooth shape design are restricted strictly. In terms of material selection, due to the limitation of the existing material process conditions, the Ti6Al4V titanium alloy material is selected as the most optimal scheme at present. However, the hardness of the base material of the material is only HRC30, which is slightly higher than that of cortical bone. The hardness of alloy steel materials applied in the orthopaedics field is generally larger than HRC 60.

Also, among metal materials, the thermal conductivity of titanium alloys is almost the lowest. Pure titanium has a thermal conductivity of 15W/mK, which is 1/7 for steel products and 1/16 for aluminum products. The heat conductivity coefficient of the Ti6Al4V titanium alloy material selected for the current ultrasonic scalpel bit is only 6.8W/m.K, the heat conductivity effect is poor, so that heat generated in the cutting process of the ultrasonic scalpel is difficult to take away and is easy to accumulate in a cutting area, the ultrasonic scalpel bit is extremely easy to blacken, the cutting edge of the ultrasonic scalpel bit is rapidly worn, the temperature of a tangent plane tissue is high, high thermal damage is generated to the cut tissue, and the service life is short. And in the process of cutting the bone by the ultrasonic scalpel, because of the friction of the contact surface and the existence of the ultrasonic heat effect, the strength of the material can be further reduced, so that the bone cutting efficiency is not high, and the total effective duration can be failed in about half an hour in clinical use.

In order to solve the problems of hardness and heat conduction, a coating with high temperature resistance, high hardness and good toughness is generally plated on the surface of a cutting tool in the field of the traditional cutting tool. However, the ultrasonic surgical blade differs from the conventional cutting tool field in that the ultrasonic surgical blade produces extremely high periodic acceleration changes during the bone cutting process. Taking an ultrasonic scalpel working at 35kHz and having an amplitude of 200 microns as an example, the following equation of motion is given:

s＝Acos(wt)w＝2πf

v＝s′＝-A·w·sin(wt)

a＝v′＝s″＝-A·w ² ·cos(wt)

where s represents displacement, A is the unilateral maximum amplitude, half of the total amplitude, w is the circular frequency, f is the vibration frequency, v is the velocity, and a is the acceleration. Based on the above formula, we can calculate the instantaneous maximum acceleration to be about 5 × 10 ⁷ m/s ² The maximum instantaneous acceleration is five million times the acceleration of gravity. Under the working condition, the common coating is easy to separate from the surface of the base material, so that the coating falls off and fails.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects existing in the prior art and providing the ultrasonic scalpel bit with the composite coating with high thermal conductivity, high hardness and ultrahigh binding force.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides an ultrasonic scalpel tool bit with composite coating, includes the tool bit main part, and attaches the composite coating in the tool bit main part outside, the tool bit main part is titanium alloy material, composite coating is TiN coating, TiCN coating, DLC coating from inside to outside in proper order.

Preferably, the tool bit body is a Ti6Al4V titanium alloy.

Preferably, the TiN coating of the composite coating is a first transition layer and has a thickness of 10 microns to 50 microns.

Preferably, the TiCN coating of the composite coating is a second transition layer with a thickness of 5-25 microns.

Preferably, the DLC coating thickness is 1 to 10 microns.

Preferably, the tool bit main body comprises a cutting edge positioned at the farthest end and a sawtooth row which is at least positioned at one side of the cutting edge and extends along the axis of the main body, the sawtooth row is two rows in parallel, the two rows of sawtooth rows are closely attached or arranged at intervals, each row of sawtooth row is formed by arranging one row of sawteeth, and the tooth tips of the two rows of sawtooth rows are in the same or opposite directions.

Preferably, the ultrasonic scalpel is provided with two end faces in the thickness direction, at least one end face is provided with a groove, and the surface of the groove is coated with the composite coating.

Preferably, the blade is at least one of a cutting edge blade, a blunt edge blade, and a serrated edge blade.

The beneficial effects of the utility model are mainly embodied in that: the existence of the two transition layers can effectively reduce the mismatching relationship between the coatings and form better bonding force; moreover, the specific thickness ratio is adopted among the coatings, so that the film falling caused by excessive concentration of internal stress can be avoided; the combination of the TiN coating, the TiCN coating and the DLC coating realizes high thermal conductivity and high hardness of the ultrasonic scalpel bit.

Drawings

The technical scheme of the utility model is further explained by combining the attached drawings as follows:

FIG. 1: the utility model discloses the schematic view of the preferred embodiment of ultrasonic scalpel tool bit.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not limited to the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the scope of the present invention.

As shown in FIG. 1, the utility model discloses an ultrasonic scalpel head with composite coating, which comprises a head main body 100 made of titanium alloy, in the preferred embodiment, Ti6Al4V titanium alloy is used.

The tool bit main body 100 comprises a cutting edge 101 located at the farthest end and a sawtooth row 102 located at least on one side of the cutting edge and extending along the axis of the main body, the sawtooth row 102 is two rows in parallel, the two rows of sawtooth rows are closely attached or arranged at intervals, each row of sawtooth row is formed by arranging a row of sawteeth 103, and the tooth tips of the two rows of sawtooth rows are in the same or opposite directions. Preferably, the ultrasonic scalpel has two end surfaces 108 in the thickness direction, and at least one of the end surfaces is provided with a groove 107. The blade 101 is at least one of a cutting edge blade, a blunt edge blade, and a serrated blade.

The outside of the tool bit body 100 (including the outer surface of the recess 107) is attached with a composite coating, and a part 1 in the figure is a microscopic cross-sectional view of the composite coating. The composite coating comprises a TiN coating 104, a TiCN coating 105 and a DLC coating 106 from inside to outside in sequence. The TiN coating of the composite coating is a first transition layer, and the thickness of the TiN coating is 10-50 microns. The TiCN coating of the composite coating is a second transition layer, and the thickness of the TiCN coating ranges from 5 micrometers to 25 micrometers. The DLC coating thickness is 1 to 10 microns.

In the preferred embodiment, TiAlN is partially included in the TiN coating, and the hardness of the coating is higher, but the toughness is poorer, and the wear resistance is relatively poorer. The TiCN coating has better side toughness. The transition layer composed of TiN coating and TiCN coating has hardness and toughness, and the residual stress between the films is very small, and the binding force is very strong. And the heat conductivity coefficient of the coating is 5 times of that of the base material, so that the heat conductivity is greatly improved, and the heat accumulation at the working tip is reduced.

The outermost DLC (diamond-like carbon) coating reduces the friction coefficient of the surface and reduces the heat generation in the cutting process, and the DLC film layer formed under the condition is close to the Young modulus of the TC4 titanium alloy adopted by the invention, and the hardness of the film layer is optimal. Because the heat conductivity coefficient has been improved greatly to new coating structure, in order to further strengthen the radiating effect, design the total length of scribbling into and be higher than the total length of cutting tooth, more optimize and be higher than the circular arc tangent plane, cool off in advance in the place that the coolant liquid flow is the biggest.

It should be noted that the TC4 titanium alloy adopted by the tool bit body of the present invention belongs to α - β type titanium alloy, the phase transition temperature is 975 ℃ ± 15 ℃, the recrystallization transition initiation temperature is 850 ℃, and if the post-treatment process is higher than 850 ℃, the ratio of the α phase and the β phase of the final material, and the size and the form of the crystal grain are affected, so that the mechanical properties of the raw material are changed, which is particularly needed to be noticed in the subsequent surface treatment process.

The preparation process of the present invention is briefly described below.

Firstly, generating a TiN coating on the outer side of the tool bit main body by a magnetron sputtering nitriding technology; putting the tool bit main body serving as a cathode material into a treatment furnace, vacuumizing the treatment furnace to 10-4Pa, slowly heating to 820 +/-10 ℃, wherein the heating speed is not more than 5 ℃/min, taking the furnace wall of the treatment furnace as an anode, applying 700-750V voltage between the two electrodes, applying a magnetic field perpendicular to the electric field at the cathode material to form an orthogonal electromagnetic field, and setting the magnetic induction intensity to be 300 kA/m; introducing high-purity nitrogen into the treatment furnace, keeping the partial pressure of the nitrogen at 0.01-0.015 MPa, and keeping the temperature for 10 hours.

Then generating a TiCN coating on the outer side of the TiN coating by utilizing a magnetron sputtering technology; vacuumizing the treatment furnace to 10-4Pa, introducing acetylene gas into the treatment furnace, and keeping the partial pressure of the acetylene gas at 0.03-0.05 MPa.

And finally, generating a DLC coating on the outer side of the TiCN coating by using a plasma chemical vapor deposition technology, putting the cutter head main body coated with the transition layer into CVD equipment, wherein the radio frequency power is 80W, the bias voltage is 150V, the deposition pressure is 10Pa, and the deposition time is 1 h.

The utility model discloses a form the composite coating of a high heat conductivity, high rigidity and superelevation cohesion in the tool bit main part outside. The process sequence must plate TiN coating, then TiCN coating and finally DLC coating. And more importantly, the selection of the thickness of the three coatings is very important. Because the substrate of the tool bit body is the TC4 titanium alloy, the TiN coating is a coating grown on the substrate by using a high-temperature magnetron sputtering technology, the coating with the thickness exceeding 50 microns needs to grow inwards by 50 microns, and higher voltage and reaction temperature are needed, so that the TiN coating can become more sparse and unstable. The thickness is too thin, which is not beneficial to the subsequent generation of TiCN coating on the basis of TiN coating. The TiCN coating grows inwards on the basis of TiN, so the thickness of the TiCN coating is not larger than that of the TiN, and the multilayer composite transition coating is used, and the optimal thickness of the TiCN coating is not more than half of that of the TiN. The DLC coating process adopts the current mainstream coating process, the DLC coating thickness is not excessively thick, and the thicker the coating, the larger the internal stress is, the more easy the DLC coating is to peel off.

Secondly the utility model discloses a vacuum furnace carries out high temperature treatment to the substrate, and what go on simultaneously is high temperature vacuum annealing in other words, and vacuum annealing has the effect of weakening limit to compound rete structure. The thermal diffusion of atoms in the film layer and on two sides of the film-substrate interface can be promoted, so that the structural characteristics of the interface are weakened, and the bonding strength between the film substrate and the film is improved.

It should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be appreciated by those skilled in the art that the specification as a whole may be appropriately combined to form other embodiments as will be apparent to those skilled in the art.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. Ultrasonic scalpel tool bit with composite coating, its characterized in that: the titanium-titanium alloy cutting tool comprises a tool bit main body (100) and a composite coating attached to the outer side of the tool bit main body, wherein the tool bit main body is made of a titanium alloy material, and the composite coating comprises a TiN coating (104), a TiCN coating (105) and a DLC coating (106) from inside to outside in sequence.

2. The ultrasonic surgical blade cartridge with composite coating of claim 1, wherein: the tool bit main body is Ti6Al4V titanium alloy.

3. The ultrasonic surgical blade tip with composite coating of claim 1, wherein: the TiN coating of the composite coating is a first transition layer, and the thickness of the TiN coating is 10-50 microns.

4. The ultrasonic surgical blade tip with composite coating of claim 1, wherein: the TiCN coating of the composite coating is a second transition layer, and the thickness of the TiCN coating ranges from 5 micrometers to 25 micrometers.

5. The ultrasonic surgical blade tip with composite coating of claim 1, wherein: the DLC coating thickness is 1 to 10 microns.

6. The ultrasonic surgical blade tip with composite coating of any one of claims 1-5, wherein: the tool bit main body (100) comprises a blade (101) located at the farthest end and at least two saw tooth rows (102) located on one side of the blade and extending along the axis of the main body, the saw tooth rows (102) are two rows in parallel, the two rows of saw tooth rows are arranged closely or at intervals, each row of saw tooth row (102) is formed by arranging one row of saw teeth (103), and the tooth tops of the two rows of saw teeth (102) face in the same or opposite directions.

7. The ultrasonic surgical blade tip with composite coating of claim 6, wherein: the ultrasonic scalpel is provided with two end faces (108) in the thickness direction, at least one end face (108) is provided with a groove (107), and the surface of the groove (107) is coated with the composite coating.

8. The ultrasonic surgical blade tip with composite coating of claim 6, wherein: the cutting edge (101) is at least one of a cutting edge, a blunt edge and a sawtooth edge.