A rotatable microwave needle under laparoscopy

Abstract

The present invention provides a rotatable microwave needle under laparoscope, comprising a hard head part, a soft connection part, a hard connection part and a handle connected in sequence, the hard head part comprises a microwave needle, a sleeve and a clamping tube in sequence, a soft microwave transmission cable extending to the hard head part is arranged inside the handle, the far end of the soft microwave transmission cable is crimped with the microwave needle to form a radiation antenna, the sleeve and the clamping tube are arranged in sequence on the outer ring of the soft microwave transmission cable, the soft connection part comprises the soft microwave transmission cable, the hard connection part comprises a cooling water plug, an outer tube and a booster tube connected in sequence, the far end of the cooling water plug is sealed and connected to the soft microwave transmission cable, the proximal end of the cooling water plug is sealed and connected to the outer tube, and the proximal outer ring of the outer tube is sleeved with the booster tube.

Description

Technical Field

[0001] The invention relates to the field of medical equipment, in particular to a rotatable microwave needle under laparoscope. Background Art

[0002] Microwave ablation is a thermal ablation technology for tumor treatment that has developed rapidly over the past 10 years. There are two aspects to the heating mechanism of microwaves on biological tissues: one is dipole heating, which is also the main factor of microwave heating. Under the action of microwave electromagnetic fields with a frequency of >900MHz, the polarity of dipole charges such as water molecules in the tumor is unbalanced, and they change direction rapidly with the alternation of the microwave electric field, flip and collide with each other at a frequency of more than one million times per second, generating a large amount of heat to cause tissue degeneration and necrosis; on the other hand, ion heating is ion heating. Under the action of microwave electromagnetic fields, ions in the tissue also change direction rapidly to vibrate and collide with each other, converting kinetic energy into thermal energy. It can be seen that the heating process of microwaves is that the tissue actively generates heat under the action of electromagnetic fields, and quickly reaches a high temperature in a short time. Compared with radiofrequency and laser ablation, microwave ablation has the characteristics of fast heating speed, strong blood vessel coagulation ability, less affected by blood flow factors, multiple antennas can act simultaneously, and the normal coagulation range is large and stable. It has become a treatment method with great potential and good application prospects in percutaneous thermal ablation and surgical ablation. It can also completely replace radiofrequency ablation and play an important role in surgical operations such as liver resection, pancreatic tumor ablation, liver tumor ablation, and biliary ablation treatment.

[0003] In the past 20 years, with the increase in the number of liver resections, more and more instruments and equipment have been developed for applications such as vascular control, hemostasis, and parenchymal separation. The most prominent manifestation is the growing variety of surgical instruments for liver separation. The separation methods range from basic finger or clamp methods to the use of complex technology-based instruments such as ultrasonic scalpels, radiofrequency energy scalpels, water cutting knives, tissue sealers, and surgical sealers. The strategic purpose of these methods is to reduce postoperative complications caused by intraoperative bleeding and blood transfusion. In addition, when choosing various methods, it is also important to consider aspects such as operation time, practicality and ease of use, the extent of damage to the liver, and cost. The traditional method of liver parenchymal separation is from finger crushing to clamp crushing, separating the ducts and ligating and cutting them. Compared with the finger crushing method, the clamp crushing method is faster, and experienced operators can more accurately judge whether there are ducts in the clamped tissue by hand feeling. When the clamp crushing method is used to separate the liver parenchyma, the small hepatic veins will be crushed with the clamp crushing, resulting in bleeding on the cross section, which can be sutured with a thin silk thread in an 8-shaped pattern. Whether it is the finger grinding method or the clamp grinding method, it needs to be coordinated with the blood flow blocking (Pringle method) into the liver. With the advancement of high technology and its integration with medical technology, many new technologies for liver parenchyma separation have been derived. However, in traditional liver parenchyma separation surgery, the use of traditional ultrasonic suction knife (Cavitron ultra-sonic surgical aspirator, CUSA), water knife and vascular closure device and other methods are the same as the clamp grinding method. The operation time is long, the amount of bleeding is large, and the incidence of complications of postoperative bile fistula is high. Summary of the invention

[0004] Purpose of the invention: The technical problem to be solved by the present invention is to provide a rotatable microwave needle under laparoscope in view of the deficiencies in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a rotatable microwave needle under laparoscope, comprising a hard head part, a soft connection part, a hard connection part and a handle connected in sequence, the hard head part comprises a microwave needle, a sleeve and a clamping tube in sequence, a soft microwave transmission cable extending to the hard head part is arranged inside the handle, the far end of the soft microwave transmission cable is crimped with the microwave needle to form a radiation antenna, the sleeve and the clamping tube are arranged in sequence on the outer ring of the soft microwave transmission cable, and the soft connection part comprises a soft microwave transmission cable. The laparoscopic forceps punctures the hard head part into the lesion by clamping the clamping tube to perform ablation surgery.

[0006] In the present invention, the hard connection part includes a cooling water plug, an outer tube and a booster tube which are connected in sequence. The distal end of the cooling water plug is sealedly connected to the flexible microwave transmission cable, the proximal end of the cooling water plug is sealedly connected to the outer tube, and the proximal outer ring of the outer tube is sleeved with the booster tube.

[0007] In the present invention, the microwave needle, sleeve and clamping tube are tightly connected in sequence and have matching diameters to form a rigid structure.

[0008] In the present invention, the sleeve comprises a signal transmitting part and a first connecting part, the signal transmitting part is used to transmit the signal at the microwave needle head, and the first connecting part is used to connect with the clamping tube.

[0009] In the present invention, the clamping tube is sleeved on the outer ring of the first connecting part to increase rigidity.

[0010] In the present invention, cooling water is provided inside the handle, and the cooling water plug includes a sealing part and a second connecting part, the sealing part is used to block the cooling water, and the second connecting part is used to connect the external tube. The cooling water cools the coaxial cable of the hard connection part through the cooling water pipe, and the return water flows back to the water tank at the handle, and forms circulating cooling water through the external peristaltic tube.

[0011] In the present invention, a microwave receiving connector is provided inside the handle, and the microwave receiving connector is connected to a flexible microwave transmission cable. A water tank is also provided inside the handle, and the water tank is connected to a cooling water pipe, and the cooling water pipe extends to a cooling water plug. The water tank is connected to a water inlet interface and a water outlet interface respectively, and a decorative cap is sleeved on the outer ring of the booster tube, and a handle assembly is connected behind the decorative cap. Beneficial effect: The present invention provides a laparoscopic microwave ablation needle with minimal bleeding, fast resection speed, and high safety. Moreover, the present invention has a rotation function, and can reach any lesion location in the body under the guidance of a laparoscope in the narrow space of the abdominal cavity, and perform precise puncture, ablation and other operations on it, which opens up a new way for the application of laparoscopic microwave needles and has good prospects for medical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and other advantages of the present invention will become more clear.

[0013] Figure 1 It is a cross-sectional view of the overall structure of the microwave needle;

[0014] Figure 2 yes Figure 1 A partial cross-sectional view of the microwave needle at position I in the middle;

[0015] Figure 3 yes Figure 1 Sectional view at II in the middle;

[0016] Figure 4 This is a schematic diagram of a microwave needle bent 110 degrees;

[0017] Figure 5 This is a schematic diagram of a microwave needle bent 90 degrees;

[0018] Figure 6 It is a schematic diagram of the overall structure of the microwave needle;

[0019] Figure 7 It is a schematic diagram of the microwave needle structure;

[0020] Figure 8 is a schematic diagram of the casing structure;

[0021] Fig. 9 is a schematic diagram of the clamping tube structure;

[0022] Fig.10 This is a schematic diagram of the cooling water plug structure;

[0023] Fig.11 It is a schematic diagram of the outer tube structure;

[0024] Fig.12 It is a schematic diagram of the booster tube structure; DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings.

[0026] Example:

[0027] like Figure 1 , Figure 2 and Figure 3 The present embodiment provides a rotatable microwave needle under laparoscope, comprising a microwave needle head 1, a sleeve 2, a clamping tube 3, a flexible microwave transmission cable 4, a cooling water plug 5, an outer tube 6, a cooling water pipe 7, a booster tube 8, a decorative cap 9, a handle assembly 10, a water tank 11, a microwave receiving joint 12, a water inlet interface 13, a water outlet interface 14, a flexible connection part 15, a hard head part 16 and a hard connection part 17. The needle tip part of the microwave needle comprises three parts: a flexible connection part 15, a hard head part 16 and a hard connection part 17. The hard head part comprises the microwave needle head 1, the sleeve 2, and the clamping tube 3 in sequence. The flexible connection part 15 comprises a flexible microwave transmission cable 4 at one end. The hard connection part 17 comprises a cooling water plug 5, an outer tube 6 and a booster tube 8 connected in sequence. A flexible microwave transmission cable 4 extending to the hard head part is provided inside the handle. The distal end of the flexible microwave transmission cable is crimped with the microwave needle head 1 to form a radiation antenna. The flexible microwave transmission cable 4 of the three parts in the microwave needle is the same cable.

[0028] The microwave needle 1 and the inner core of the flexible microwave transmission cable 4 are crimped at the distal end to form a radiation antenna, and the inner core of the other end of the flexible microwave transmission cable 4 is connected to the microwave receiving connector 12 at the proximal end; the high-frequency 915Mhz microwave signal is emitted from the microwave device, and the flexible microwave transmission cable 4 transmits the microwave signal to the radiation antenna through the microwave receiving connector 12, and microwaves are generated at the radiation antenna to achieve microwave ablation of the tissue around the antenna. The present invention has no water cooling function at the distal end of the microwave needle at about 56mm, and the microwave transmission cable 4 is composed of soft materials, so the microwave needle can be rotated at any angle at the distal end; at 46mm from the distal end, a rigid stainless steel tube 3 is wrapped outside the flexible microwave transmission cable 4, so that the distal end 0-46mm has rigidity, and can be arbitrarily clamped by the laparoscopic forceps without deformation, and under the guidance of the laparoscopic forceps, the puncture tissue function is achieved. The sleeve 2 is not a metal material, and will not shield the microwave signal, so that the signal of the radiation antenna 1 can be emitted from the sleeve 2 to achieve the ablation function.

[0029] In this embodiment, the sleeve 2 is a PTFE polytetrafluoroethylene sleeve 2, the clamping tube 3 is a stainless steel clamping tube, and the outer tube 6 is a PEEK outer tube.

[0030] A microwave receiving connector 12 is provided inside the handle, and the microwave receiving connector 12 is connected to a flexible microwave transmission cable. A water tank 11 is also provided inside the handle, and the water tank 11 is connected to a cooling water pipe 7, and the cooling water pipe 7 extends to a cooling water plug 5. The water tank 11 is connected to a water inlet interface 13 and a water outlet interface 14 respectively. The handle includes a booster tube 8 sleeved on an outer tube 6. The outer ring of the booster tube 8 is sleeved with a decorative cap 9, and the decorative cap 9 is connected to a handle assembly 10. The proximal end of the microwave needle of the present invention has a water cooling function. The cooling water reaches the distal cooling water plug 5 position of the microwave needle from the water inlet interface 13 through the cooling water pipe 7, and cools the flexible microwave transmission cable 4 in the outer tube 6, which is about 56 mm away from the radiation antenna 1. The cooling water flows back to the water tank assembly 11 and flows out of the instrument through the water outlet interface 14. Driven by a peristaltic water pump, the circulating cooling water circulates in the cavity of the instrument to take away a large amount of heat generated by the microwave needle when it is working, so as to achieve the purpose of cooling the microwave needle rod and keep the temperature of the needle rod at about 35 degrees Celsius.

[0031] like Figure 4 and Figure 5 , which are schematic diagrams of the microwave needle when bent 110 degrees and 90 degrees respectively. Since the soft connection part 15 is a bare soft microwave transmission cable 4, this section can be bent.

[0032] like Figure 6 , which is a schematic diagram of the overall structure of the microwave needle when it is bent.

[0033] like Figure 7 The inner core of the flexible microwave transmission cable 4 is inserted into the microwave needle 1 and crimped and fixed to form a radiation antenna.

[0034] like Figure 8 The sleeve 2 includes a signal transmitting portion 2a and a first connecting portion 2b, the signal transmitting portion 2a is used to transmit the signal at the microwave needle head 1, and the first connecting portion 2b is used to connect with the clamping tube 3.

[0035] like Fig. 9 The clamping tube 3 is sleeved on the outer ring of the first connecting part 2b to increase rigidity.

[0036] like Fig.10 Cooling water is provided inside the handle, and the cooling water plug 5 includes a sealing portion 5a and a second connecting portion 5b, the sealing portion 5a is used to block the cooling water, and the second connecting portion 5b is used to connect the outer tube 6.

[0037] like Fig.11 The distal end of the outer tube 6 is sleeved on the second connecting portion 5b of the cooling water plug 5, and the proximal end is used to protect the cooling water pipe.

[0038] like Fig.12 The booster tube 8 is connected to the handle to facilitate holding the microwave needle.

[0039] The laparoscopic microwave needle of the present invention can achieve high-power, long-term, and continuous ablation due to its cooling water function, without damaging surrounding tissues and the laparoscopic clamp channel; at the same time, the distal end has the function of rotating at any angle, and can be clamped by the abdominal clamp, and under its guidance, the purpose of puncturing, ablation, and treatment of the abdominal organs can be achieved. It provides a good tool for surgeons to carry out laparoscopic microwave ablation surgery and surgical open laparotomy microwave ablation surgery, and is a treatment method with great potential and good application prospects.

[0040] When the microwave needle is in use, the laparoscopic forceps clamp the clamping tube to puncture the microwave needle into the lesion site to perform an ablation operation.

[0041] The present invention provides a new device for liver parenchyma separation with minimal bleeding, fast resection speed and high safety, namely, a laparoscopic microwave ablation needle. Since the present invention has the function of rotating at any angle, it can reach any lesion position in the body under the guidance of a laparoscope in the narrow space of the abdominal cavity, and perform precise puncture, ablation and other operations on it. It opens up a new way for the application of laparoscopic microwave needles and has good prospects for medical application.

[0042] Theoretical and experimental verification show that a power of 50W and a time of 100S are selected, and 915MHz microwaves can form a columnar coagulation zone of about 5CM in length and 2CM in width in the liver. This system is designed based on the above parameters. In liver resection surgery, this system is first used to coagulate a 2CM wide coagulation necrosis zone of liver parenchyma on the planned resection section to achieve the purpose of hemostasis, and then conventional scalpels, ultrasonic scalpels and other equipment are used to separate the liver parenchyma.

[0043] During the operation, microwaves are used to pre-coagulate the resection surface, causing coagulative necrosis of the liver tissue and occlusion of small blood vessels (within 5 mm in diameter). After coagulation is complete, the process of separating the liver parenchyma is actually carried out within the pre-coagulated surface. During the separation process, attention is paid to ligating larger blood vessels, so that there is almost no bleeding during the entire separation process.

[0044] After the liver parenchyma has been coagulated, the liver is severed. Since the necrotic tissue is loose and does not bleed, the operation time and liver ischemia time are greatly shortened, which is beneficial to the patient's postoperative recovery.

[0045] Since the cross-section of the liver parenchyma shows aseptic coagulative necrosis, the chances of postoperative complications such as bile leakage, bleeding, infection, and liver failure are small, and a higher level of surgical safety can be achieved.

[0046] The present invention provides a rotatable microwave needle under laparoscope. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A rotatable microwave needle under laparoscope, characterized in that: The invention comprises a hard head part (16), a soft connection part (15), a hard connection part (17) and a handle which are connected in sequence; the hard head part comprises a microwave needle (1), a sleeve (2) and a rigid clamping tube (3) in sequence; a soft microwave transmission cable (4) extending to the hard head part is arranged inside the handle; the far end of the soft microwave transmission cable is crimped with the microwave needle (1) to form a radiation antenna; the sleeve (2) and the clamping tube (3) are arranged in sequence on the outer ring of the soft microwave transmission cable (4); the soft connection part comprises the soft microwave transmission cable (4); the soft connection part The hard connection part (15) is a bendable exposed soft microwave transmission cable (4); the hard connection part includes a cooling water plug (5), an outer tube (6) and a booster tube (8) connected in sequence, the distal end of the cooling water plug (5) is sealedly connected to the soft microwave transmission cable (4), the proximal end of the cooling water plug (5) is sealedly connected to the outer tube (6), and the proximal outer ring of the outer tube (6) is sleeved with a booster tube (8); the laparoscopic forceps clamp the clamping tube (3) of the hard head part (16) to puncture the hard head part (16) into the lesion site to perform an ablation operation.

2. The laparoscopically rotatable microwave needle according to claim 1, characterized in that: The microwave needle (1), sleeve (2) and clamping tube (3) are tightly connected in sequence and have matching diameters to form a rigid structure.

3. The laparoscopically rotatable microwave needle according to claim 1, characterized in that: The sleeve (2) comprises a signal transmitting portion (2a) and a first connecting portion (2b), the signal transmitting portion (2a) being used to transmit a signal at the microwave needle (1), and the first connecting portion (2b) being used to connect to a clamping tube (3).

4. The laparoscopically rotatable microwave needle according to claim 3, characterized in that: The clamping tube (3) is sleeved on the outer ring of the first connecting portion (2b) to increase rigidity.

5. The laparoscopically rotatable microwave needle according to claim 1, characterized in that: Cooling water is provided inside the handle, and the cooling water plug (5) comprises a sealing portion (5a) and a second connecting portion (5b), the sealing portion (5a) is used to block the cooling water, and the second connecting portion (5b) is used to connect to the outer tube (6).

6. The laparoscopically rotatable microwave needle according to claim 1, characterized in that: A microwave receiving connector (12) is provided inside the handle, and the microwave receiving connector (12) is connected to a flexible microwave transmission cable. A water tank (11) is also provided inside the handle, and the water tank (11) is connected to a cooling water pipe (7), and the cooling water pipe (7) extends to a cooling water plug (5). The water tank (11) is respectively connected to a water inlet interface (13) and a water outlet interface (14). The outer ring of the booster tube (8) is sleeved with a decorative cap (9), and the decorative cap (9) is connected to a handle assembly (10) behind it.

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