Ultrasonic surgical operating instrument capable of measuring temperature
By setting a temperature sensor at the blade of an ultrasonic surgical instrument and using existing circuit design to achieve real-time temperature monitoring, the problem of blade temperature detection is solved, the risk of thermal damage is reduced, and it has the advantages of simple structure and wide applicability.
Patent Information
- Application Number
- CN202422372048.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-09-27
AI Technical Summary
During use, it is difficult to detect the temperature of the blade of existing ultrasonic surgical instruments, resulting in a high risk of thermal damage.
A temperature sensor is set at the cutter head, and a current path is formed through the circuit board in the handle and the transducer to realize real-time monitoring of the cutter head temperature. The temperature measurement signal and the manual control signal share the same line, and the existing circuit design does not need to change the handle and transducer structure.
It realizes real-time and accurate monitoring of the temperature of the cutter head, reduces the risk of thermal damage caused by excessive temperature, and has a simple structure and wide applicability.
Smart Images
Figure CN223453286U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the field of surgical instruments, in particular to a temperature-measurable ultrasonic surgical instrument. BACKGROUND
[0002] Ultrasonic knives and ultrasonic electrotomes are commonly used in ultrasonic surgical instruments. Ultrasonic knives have good cutting performance, and high-frequency electrotomes have good coagulation performance. Ultrasonic electrotomes combine the advantages of both.
[0003] In the process of using these surgical instruments, the knife head part often generates heat. If the knife head generates too much heat, it will cause irreparable thermal damage to the target tissue being processed and the surrounding non-target tissue. By detecting the temperature of the knife head in real time and reducing energy output when the temperature is too high, the occurrence of thermal damage can be effectively reduced.
[0004] Therefore, how to achieve temperature detection of the knife head through simple structural design is a problem to be solved. CONTENT OF THE UTILITY MODEL
[0005] The present disclosure provides a temperature-measurable ultrasonic surgical instrument to solve the problem of how to achieve temperature detection of the knife head through simple structural design.
[0006] To solve the above technical problems, the present disclosure provides a temperature-measurable ultrasonic surgical instrument, which includes a knife rod and a handle, and a hand control operation button is arranged on the handle. The surgical instrument is driven by ultrasonic energy or ultrasonic energy plus high-frequency electric energy, and the high-frequency electric energy is output at a set periodic interval. The surgical instrument further includes a first electrical interface arranged at the front end of the handle for connecting the knife rod, a second electrical interface arranged at the rear end of the handle for connecting a transducer, a temperature sensor arranged at the knife head of the knife rod, and a circuit board arranged inside the handle. The temperature sensing line of the temperature sensor is connected to the circuit board through the first electrical interface, the hand control operation button is connected to the circuit board, and the circuit board is connected to the second electrical interface. The temperature sensing signal generated by the temperature sensor and the hand control signal triggered by the hand control operation button are transmitted to a host device through the circuit board and the transducer connected to the second electrical interface.
[0007] According to the technical solution of the present disclosure, a temperature sensor is arranged at the knife head, the temperature sensing line is connected to the circuit board in the handle, and the temperature sensing signal and the hand control signal can reach the host device through the current path formed by the circuit board and the transducer, so that real-time monitoring of the temperature of the knife head can be realized. The technical solution of the present disclosure fully utilizes the existing circuit between the handle and the transducer in the prior art, the temperature sensing signal and the hand control signal share the same line, and the structure design of the rear end of the handle and the transducer does not need to be changed, which has the beneficial effects of simple structure and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0009] Figure 1 A schematic diagram of a usage scenario of a surgical instrument provided in an embodiment of the present disclosure;
[0010] Figure 2 A schematic structural diagram of a temperature-measurable ultrasonic surgical instrument provided in an embodiment of the present disclosure;
[0011] Figure 3 Schematic diagram of periodic output of high-frequency electric energy in an embodiment of the present disclosure;
[0012] Figure 4 This is a schematic diagram of the internal structure of the handle in the embodiment of the present disclosure;
[0013] Figure 5 This is a functional structure diagram of the circuit board in the embodiment of the present disclosure;
[0014] Figure 6 Schematic diagram of an interference suppression circuit in an embodiment of the present disclosure.
[0015] Reference numerals:
[0016] Surgical instrument 100 jaws 130 circuit board 160
[0017] Transducer 200 Cutting head 131 Signal amplifier 161
[0018] Host device 300 Clamp arm 132 Interference suppression circuit 162
[0019] Tool bar 110 Manual operation button 140 Signal trigger 163
[0020] Handle 120 Temperature sensor 150 Signal controller 164
[0021] First electrical interface 121 Internal wire 170
[0022] Second electrical interface 122 DETAILED DESCRIPTION
[0023] It should be noted that the embodiments described in the present disclosure are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present disclosure. In addition, for the sake of clarity, parts irrelevant to the description of the exemplary embodiments are omitted in the drawings. In the present disclosure, it should be understood that terms such as “include” or “have” are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof disclosed in the present disclosure, and do not exclude the possibility of existence or addition of one or more other features, numbers, steps, actions, components, parts or combinations thereof. In addition, it should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.
[0024] The ultrasonic knife converts high-frequency current into mechanical vibration through an ultrasonic transducer, so that the metal knife head produces mechanical vibration, and the vibration frequency is about 55.5KHz. This high-frequency mechanical friction generates friction heat. The high-frequency electrotome generates heat effect by providing high-frequency voltage and current to the lesion site to achieve tissue cutting and hemostasis. The temperature of the high-frequency electrotome during cutting is above 100℃, and the temperature during coagulation is about 60-100℃. The ultrasonic electrotome is a new type of surgical instrument that comprehensively utilizes the mechanical vibration generated by ultrasonic energy and the heat effect generated by high-frequency electric energy.
[0025] In surgical applications, these surgical instruments need to be connected to a host device that provides energy output, as shown in Figure 1 The instrument end 100 in the figure has a general structure, which is convenient for the operator to hold and perform operations such as stripping and clamping the surgical tissue. The instrument end 100 includes a knife rod 110 and a handle 120. The front end of the knife rod is a jaw 130, which is composed of a knife head 131 and a clamping arm 132. The jaw is opened and closed with the relative movement of the sleeve assembly outside the knife rod. The handle 120 is provided with a manual operation button 140. In the scenario of using ultrasonic energy, the instrument end 100 is connected to the host device 300 through the transducer 200. The host device 300 can output corresponding ultrasonic energy or high-frequency electric energy to drive the instrument end 100 to perform operations.
[0026] The blade head is the primary component for performing surgical procedures. It is typically integrated with the blade shaft and forms a jaw with the clamping arm to perform tissue stripping, clamping, and energy application. During operation, the blade head mechanically vibrates at ultrasonic frequencies. This high-frequency mechanical friction achieves the purpose of cutting. The jaws also serve as the discharge zone of a bipolar electrosurgical unit, providing high-frequency voltage and current to the clamped tissue, generating a thermal effect that denatures proteins and forms a viscous coagulant to achieve hemostasis. Depending on the surgical purpose, the ultrasonic electrosurgical unit may utilize both ultrasonic and high-frequency electrical energy. For example, during cutting, both energies are output simultaneously, resulting in a more effective surgical outcome.
[0027] In actual applications, the temperature control of the cutter head mainly depends on the operator's experience and judgment. Improper operation can easily cause thermal damage.
[0028] To this end, the temperature-measuring ultrasonic surgical instrument proposed in this disclosure incorporates a temperature sensor at the blade tip, enabling accurate and real-time sensing of blade temperature changes. The host device then controls the power output based on the blade tip's temperature, effectively reducing the risk of overheating. The following provides a clear and complete description of the technical solution of this disclosure, combined with the accompanying drawings of the disclosed embodiments.
[0029] Figure 2 Schematic diagram of the structure of the temperature-measurable ultrasonic surgical instrument provided in an embodiment of the present disclosure.
[0030] like Figure 2 The temperature-measuring surgical instrument 100 shown includes a blade 110 and a handle 120, with a manual operation button 140 provided on the handle. The surgical instrument 100 is driven by ultrasonic energy or a combination of ultrasonic energy and high-frequency electrical energy, and the high-frequency electrical energy is output at set periodic intervals. During the operation, the high-frequency electrical energy can be output continuously or at a certain duty cycle. In this case, the cycle is generally between 0.5s and 1s, and the duty cycle is about 50%. Figure 3 As shown in the figure, high-power, high-frequency currents can significantly interfere with temperature measurement circuits. Using the interval output mode during which no energy is output for temperature measurement effectively reduces high-frequency interference and improves temperature measurement accuracy. Furthermore, because the intervals are extremely short and the temperature does not change instantaneously, the temperature results obtained with this temperature measurement method also reflect temperature changes at the tool tip.
[0031] like Figure 2As shown, in order to realize temperature measurement, the surgical instrument 100 further comprises: a first electrical interface 121 arranged at the front end of the handle 120 for connecting the blade rod 110, a second electrical interface 122 arranged at the rear end of the handle 120 for connecting the transducer 200; a temperature sensor 150 arranged at the blade head 131 of the blade rod 110 and a circuit board 160 arranged inside the handle 120. The temperature measurement line of the temperature sensor 150 is connected with the circuit board 160 through the first electrical interface 121, the manual operation button 140 is connected with the circuit board 160, and the circuit board 160 is connected with the second electrical interface 122.
[0032] In operation, the temperature measurement signal generated by the temperature sensor 150 and the manual signal triggered by the manual operation button are transmitted to the host device through the circuit board 160 and the transducer 200 connected with the second electrical interface 122.
[0033] By arranging the temperature sensor 150 at the blade head 131, the temperature of the blade head can be sensed in real time and accurately, so as to determine whether the target tissue at the blade head 131 is overheated. If the temperature of the blade head is too high or the accumulated heat caused by continuous heating exceeds the threshold value, the temperature of the blade head is reduced by reducing the output energy, so as to prevent the blade head from causing irreparable thermal damage to the target tissue and the surrounding tissue.
[0034] Figure 4 The structure inside the handle is shown.
[0035] As shown in Figure 4 , an internal lead 170 connecting the first electrical interface 121 and the circuit board 160 is arranged inside the handle 120, and the internal lead 170 is connected with the circuit board 160 through a PCB terminal 180. The structure of connecting with the circuit board through the PCB terminal not only reduces the process and complexity of handle assembly, but also facilitates various tests, and is more convenient and fast when the circuit board needs to be replaced and upgraded.
[0036] Figure 5 The functional structure block diagram of the circuit board is shown.
[0037] As shown in Figure 5 , a signal amplifier 161 is arranged in the circuit board 160 for outputting after compensating and amplifying the temperature measurement signal. When the temperature sensor is arranged at the blade head, the temperature measurement signal generated by the temperature sensor needs to be received. The temperature measurement signal is different according to different temperature sensors, for example, the voltage signal is generated for thermocouple, and the resistance signal is generated for thermal resistance. The temperature measurement signal generated by the temperature sensor when the temperature changes is usually very small, for example, the voltage difference between each Celsius degree is only several tens of microvolts when the thermocouple measures the temperature, so the signal needs to be amplified and linearly adjusted before being sampled by most ADC modules.
[0038] For example, when using a K-type thermocouple to measure temperature, the signal amplifier can use an AD8495 chip, which integrates a thermocouple cold junction compensator, can be matched with the characteristics of the K-type thermocouple after laser adjustment, and the combination of the freezing point reference and the pre-accurate amplifier can directly generate a 5mV / ℃ output from the thermocouple signal.
[0039] A disturbance suppression circuit 162 is provided before the signal amplifier 161. In order to reduce the interference of the temperature measurement signal generated by the temperature sensor in the environment of high-frequency electrical interference and other electrical noise, interference suppression is required before signal amplification. For example, the interference suppression circuit designed before signal amplification using AD8495 is as shown in Figure 6 The circuit can suppress high-frequency interference signals picked up by the thermocouple, and the protection circuit composed of diodes can also prevent transient high-energy from impacting the AD8495.
[0040] After linear compensation and amplification, the temperature measurement signal needs to be conditioned after reaching the host device, including: first amplifying the millivolt-level temperature measurement signal, then filtering out the high-order harmonics carried by the signal through a second-order low-pass filter, and finally performing electrical isolation through an optoelectronic coupling circuit. The isolated signal is then sent to the DAQ acquisition card for data acquisition.
[0041] In addition, since the temperature is measured in a high-power high-frequency current environment, in order to protect the power supply circuit, the temperature detection circuit and the subsequent conditioning circuit are powered by an isolated power supply.
[0042] A signal trigger 163 is also provided in the circuit board 160, which is used to generate a corresponding manual signal under the trigger of the manual operation button. The signal trigger and the manual operation button constitute a switch circuit, which responds to the pressing of the manual operation button and generates a corresponding manual signal. Usually, the operation button on the handle is used to select and switch the energy level.
[0043] The signal controller 164 is further arranged in the circuit board 160, and is configured to control the output of the hand control signal and the temperature measuring signal after compensation and amplification. The signal controller 164 is configured to output the temperature measuring signal after compensation and amplification in a time interval in which the high-frequency electric energy is not output, and output the hand control signal in a time interval in which the high-frequency electric energy is output, according to the periodic interval of the high-frequency electric energy output. The response time of the temperature sensor is about 200 ms, and the temperature measuring signal can be output for a duration of not less than 200 ms each time, so as to meet the temperature measuring requirement. Since the signal represented by the hand control operation button is a fixed level, and does not need to be output continuously, the hand control signal can be output in the time interval in which the high-frequency electric energy is output. In addition, the signal controller 164 can also control the hand control signal and the temperature measuring signal to be output in an interval manner in the time interval in which the high-frequency electric energy is not output, so as to avoid the two signals from being disturbed by the high-frequency current and interfering with each other. In addition, the signal controller 164 can also control the hand control signal and the temperature measuring signal to be output in a mixed signal manner in the time interval in which the high-frequency electric energy is not output, for example, by using a signal multiplexing manner such as frequency modulation and phase modulation.
[0044] The temperature sensor 150 can be a thermocouple. The measuring end of the thermocouple is arranged on the surface of the tool head, and the corresponding temperature measuring wire extends from the tool head 131 to the tail of the tool rod 110 and is connected with the first electrical interface 121. In this embodiment, a surface temperature measuring thermocouple can be selected, for example, a Kepson T-type ultra-fine temperature measuring wire thermocouple. The diameter of the temperature measuring wire is less than 0.2 mm, and the temperature sensing head and the temperature measuring wire can be attached to the surface of the tool rod, without affecting the opening and closing of the tool head and without affecting the energy transmission. This type of temperature sensor has mature technology, controllable cost, wide temperature measurement range and high precision.
[0045] The temperature sensor 150 can also be a thermistor. The measuring end of the thermistor is arranged in the tool head, and the corresponding temperature measuring wire extends axially through the tool rod 110 and extends out of the tail of the tool rod to be connected with the first interface 121. In this embodiment, a detection hole can be formed in the tool head, and the measuring end of the thermistor is in contact with the target tissue through the detection hole, so as to improve the measurement accuracy.
[0046] According to the technical scheme of the present disclosure, the temperature sensor is arranged on the tool head, the temperature measuring wire is connected with the circuit board in the handle, and the temperature measuring signal and the hand control signal can reach the host device through the current path formed by the circuit board and the transducer, so that the real-time monitoring of the temperature of the tool head can be realized. The technical scheme of the present disclosure fully utilizes the existing current path between the handle and the transducer in the prior art, and the temperature measuring signal and the hand control signal share the same line, without the need to change the structure design of the rear end of the handle and the transducer, so that the technical scheme has the beneficial effects of simple structure and wide applicability.
[0047] The above merely describes the embodiments of the present disclosure, and is not intended to limit the present disclosure. The present disclosure can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of claims of the present disclosure.
Claims
1. A temperature detectable ultrasonic surgical instrument comprising a blade bar and a handle, a manually operated control button being provided on the handle, characterized in that The surgical instrument is driven by ultrasonic energy or ultrasonic energy plus high-frequency electric energy, and the high-frequency electric energy is output at a set periodic interval, and the surgical instrument further comprises: a first electric interface arranged at the front end of the handle for connecting the blade rod, a second electric interface arranged at the rear end of the handle for connecting the transducer, a temperature sensor arranged at the blade head of the blade rod, and a circuit board arranged in the handle; a temperature measuring line of the temperature sensor is connected with the circuit board through the first electric interface, the hand control operation button is connected with the circuit board, and the circuit board is connected with the second electric interface; the temperature measuring signal generated by the temperature sensor and the hand control signal triggered by the hand control operation button are transmitted to the host device through the circuit board and the transducer connected with the second electric interface.
2. The surgical instrument of claim 1, wherein, An internal lead wire is arranged in the handle to connect the first electric interface and the circuit board, and the internal lead wire is connected with the circuit board through a PCB terminal.
3. The surgical instrument of claim 1, wherein, A signal amplifier is arranged in the circuit board to output the temperature measuring signal after compensation and amplification.
4. A surgical instrument according to claim 3, wherein An interference suppression circuit is arranged before the signal amplifier.
5. The surgical instrument of claim 3, wherein, A signal trigger is further arranged in the circuit board to generate a corresponding hand control signal under the triggering of the hand control operation button.
6. The surgical instrument of claim 5, wherein, A signal controller is further arranged in the circuit board to control the output of the hand control signal and the temperature measuring signal after compensation and amplification.
7. A surgical instrument according to claim 6, wherein The signal controller outputs the temperature measuring signal after compensation and amplification in the time interval without output of the high-frequency electric energy according to the periodic interval of the output of the high-frequency electric energy, and outputs the hand control signal in the time interval with output of the high-frequency electric energy.
8. The surgical instrument of claim 1, wherein, The temperature sensor is a thermocouple, and a measurement end of the thermocouple is arranged on the surface of the blade head, and the temperature measuring line is connected with the first electric interface from the blade head along the surface of the blade rod to the tail of the blade rod.
9. A surgical instrument according to claim 8, wherein, The temperature sensor is a thermistor, and a measurement end of the thermistor is arranged in the blade head, and the temperature measuring line is connected with the first electric interface by penetrating through the blade rod in the axial direction and extending from the tail of the blade rod.
10. The surgical instrument of claim 1, wherein, The surgical instrument comprises an ultrasonic knife and an ultrasonic electric knife.