阅读说明：本技术 一种医用泡沫金属换热器的低温探针 (Low-temperature probe of medical foam metal heat exchanger ) 是由 王岳洛 姜红强 于 2019-03-04 设计创作，主要内容包括：本发明涉及低温外科手术治疗的医疗器械,特别是一种医用泡沫金属换热器的低温探针。现有氩氦刀低温探针采用螺旋状的进流管和翅片存在加工复杂难度大、成品率低、制造成本高等缺陷。本发明提供一种医用泡沫金属换热器的低温探针,探针本体从双层结构改为只留外壳,螺旋进流管改直管,加工难度简化,成品率提高；导电长杆直接设置在进流用直管中；螺旋换热翅片也改为孔隙泡沫金属换热,节流氩气经过孔隙回流排入大气中,回流冷量通过换热器进行换热,对进流管中高压氩气在节流前预冷,探针温度更低。(The invention relates to a medical instrument for low-temperature surgical operation treatment, in particular to a low-temperature probe of a medical foam metal heat exchanger. The existing argon-helium knife cryogenic probe adopts a spiral inflow pipe and a spiral fin and has the defects of complex processing difficulty, low yield, high manufacturing cost and the like. The invention provides a low-temperature probe of a medical foam metal heat exchanger, wherein a probe body is changed from a double-layer structure into a structure with only a shell left, a spiral flow inlet pipe is changed into a straight pipe, the processing difficulty is simplified, and the yield is improved; the long conductive rod is directly arranged in the straight pipe for current inlet; the spiral heat exchange fins are also changed into pore foam metal for heat exchange, throttling argon is discharged into the atmosphere through pore backflow, backflow cold energy is subjected to heat exchange through the heat exchanger, high-pressure argon in the inflow pipe is precooled before throttling, and the temperature of the probe is lower.)

1. The utility model provides a medical foam metal heat exchanger's cryoprobe, includes probe body shell (7) and locates inflow pipe and heat exchanger and tip in it and electrically conductive stock (12) of taking thermocouple (11), the heat exchanger is located between inflow pipe outer wall and probe body shell (7) inner wall, characterized by inflow pipe be one with probe body shell (7) with axle center and front end open-ended straight tube (8), electrically conductive stock (12) are located in straight tube (8) and are stretched out from the opening, the heat exchanger is metal heat exchanger (9) of taking hole (10).

2. The cryoprobe of a medical metal foam heat exchanger as claimed in claim 1, characterized in that the front end of the probe body housing (7) forms a working tip.

3. The medical low-temperature probe with the metal foam heat exchanger as claimed in claim 1 or 2, wherein the metal heat exchanger (9) is continuous metal foam extending along the length direction of the probe body shell (7), and the extending length of the metal foam is 10-14 cm.

4. The cryoprobe of a medical foam metal heat exchanger as claimed in claim 3, characterized in that the foam metal porosity is 50 to 55 PPI.

5. The cryoprobe of a medical metal foam heat exchanger as claimed in claim 4, wherein the metal foam is copper foam.

Technical Field

The invention relates to a medical instrument for low-temperature surgical operation treatment, in particular to a low-temperature probe of a medical foam metal heat exchanger.

Background

The argon-helium knife is an operation instrument for ultra-low temperature cryoablation tumor, and is used for treating tumor by freezing and thermotherapy, and the specific working principle is that argon is utilized for throttling refrigeration to quickly cool a treatment probe, so that the treatment probe reaches a treatment temperature (lower than-120 ℃ C.) in a short time, and the throttling refrigeration is used for quickly cooling by utilizing the process that after high-pressure gas flows through a small hole in a pipeline for diffusion, the pressure is obviously reduced. The probe is an important working component of the argon-helium knife, the existing probe structure is shown in figure 1, the probe body is a double-layer structure consisting of an inner tube 2 and an outer tube 1, an opening at the front end of the inner tube corresponding to a working part at the front end of the probe is communicated with an inner cavity of the outer tube, a conductive long rod 3 is arranged in the inner tube, the front end of the long rod extends out from the opening at the end of the inner tube, a thermocouple is arranged at the front end of the long rod and serves as a temperature measuring sensor 4, a flow inlet tube 5 and a fin 6 which are coiled along the spiral shape are arranged in an interlayer of the inner tube and the outer tube, the fin is arranged on the outer wall. When in work, high-pressure argon enters the probe through the inflow pipe and is sprayed out from the small-hole nozzle, the high-pressure argon is rapidly expanded in the inner cavity at the front end of the outer pipe, the pressure of the argon is rapidly reduced to the normal pressure, thereby generating the adiabatic throttling effect of rapid temperature reduction, the argon reduced to normal pressure passes through the fins wound outside the inflow pipe and is discharged backwards along the interlayer of the probe body to be released into the atmosphere, the fins are used for carrying out heat exchange on the low temperature of the throttled argon, further cooling and reducing the temperature of the high-pressure argon in the inflow pipe, so that the temperature of the argon in the inflow pipe is lower than the initial temperature, the operation is continuously carried out in such a way that the temperature of the argon in the inflow pipe is lower and lower until the balance is achieved, therefore, the cooling time of the probe in the freezing treatment is greatly shortened, the temperature of the probe needle can be reduced to minus 160 ℃ within several seconds generally by argon throttling, and the pathological tissue is frozen to minus 120 to minus 165 ℃ within ten seconds. The inflow tube and the fins of the low-temperature probe are spirally coiled, the spiral inflow tube and the spiral fins are complex to process, and the size of the inflow tube and the size of the fins are very small because the inflow tube and the fins are arranged in a narrow space of a probe interlayer, the processing difficulty is high, the yield is low, and the manufacturing cost of the inflow tube and the fins is greatly improved.

Disclosure of Invention

The invention provides a low-temperature probe of a medical foam metal heat exchanger, which aims to solve the main technical problems and the main technical task of overcoming the technical defects of complex processing, high difficulty, low yield, high manufacturing cost and the like caused by the adoption of a spiral inflow pipe and a spiral fin of the conventional argon-helium-knife low-temperature probe.

The invention adopts the following technical scheme: the utility model provides a medical foam metal heat exchanger's cryoprobe, includes probe body shell and locates inflow pipe and heat exchanger and the electrically conductive stock of tip area thermocouple in it, the heat exchanger is located between inflow pipe outer wall and the probe body shell inner wall, characterized by inflow pipe be one with probe body shell with axle center and front end open-ended straight tube, electrically conductive stock is located in the straight tube and is stretched out from the opening, the heat exchanger is the metal heat exchanger in band hole. The invention changes the structure of the existing low-temperature probe, the probe body is changed into only a shell from the original double-layer structure, the spiral flow inlet pipe is changed into a straight pipe, the processing difficulty is greatly simplified, and the yield is high; the long conductive rod is directly arranged in the straight pipe for current inflow, and the thermocouple still serves as a sensor for temperature measurement; the spiral heat exchange fins are changed into metal heat exchangers with holes, the metal heat exchangers are provided with holes, throttled argon flows back through the holes and is discharged into the atmosphere, cold energy of the throttled argon can be exchanged heat through the heat exchangers made of metal materials, high-pressure argon in the inflow pipe is further precooled before throttling, and the temperature of the probe is lower after throttling.

As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures: the front end of the probe body shell forms a working tip. The working tip formed at the front end of the probe body shell can puncture the lesion tissue to be cut off during operation, thereby further improving the effect of cryotherapy.

The metal heat exchanger is continuous foam metal extending along the length direction of the shell of the probe body, and the extending length of the foam metal is 10-14 cm. The continuous foam metal extending along the length direction of the shell of the probe body is used as a heat exchanger to exchange heat and cool argon in the inflow pipe, the foam metal is a typical new material with low density, belongs to a porous medium, and has the advantages of high through-hole rate, large specific surface area, uniform pore structure and better mechanical property, the foam metal in unit volume can provide large heat conduction area and convection, and has high permeability as well as the dual properties of a structural material and a functional material. When the probe works, after high-pressure argon is expanded and throttled, the gas pressure is sharply reduced, the gas temperature is also rapidly reduced, then low-temperature argon flows through foam metal and is reversely refluxed and discharged relative to high-pressure inlet flow in a straight pipe, so that the temperature of the foam metal is continuously reduced, the temperature of the argon in the flowing straight pipe is reduced compared with the initial temperature by the foam metal through conduction heat exchange, and the process is continuously carried out until the temperature of the flowing gas is gradually reduced until the balance is achieved, the low-temperature probe can obtain lower working temperature, and the cooling time of the probe is greatly shortened, so that the operation treatment is facilitated; the length of the foam metal determines the heat exchange area, the resistance of the backflow gas is influenced, and if the length is too short, the cold quantity of the backflow argon gas cannot be discharged in time of carrying out sufficient heat exchange with the foam metal, so that the cooling of the argon gas in the inflow pipe is not facilitated; the conventional probe is about 20cm in length, the foam metal extension length is set to be 10-14 cm, if the length is too long, the resistance is large, the argon backflow time is long, the quality of backflow argon in the same time can be correspondingly reduced, the provided cold quantity is also reduced, and the precooling of the argon in the inflow pipe is influenced. Furthermore, metal foams are particularly suitable as heat exchangers for use in small-space, compact devices.

The porosity of the foam metal is 50-55 PPI. The PPI of the foam metal indicates the number of pores per inch, the higher the porosity indicates the portion of the pores, and the higher the PPI value indicates the more pores and the smaller the size of the pore unit. The thermal conductivity of the foam metal is reduced along with the increase of the porosity, and the gas backflow permeability is better when the porosity is increased, so that the porosity of the foam metal is set to be 50-55 PPI, the optimal heat exchange effect can be achieved while the argon gas backflow effect is not influenced, and the argon gas temperature in the inflow pipe is reduced.

The foam metal is foam copper. The foamy copper has better heat conductivility and ductility, and the good bending of being convenient for of ductility is assembled, and the heat conductivity does benefit to and improves heat exchange efficiency well.

The invention changes the internal structure of the existing low-temperature probe, changes the original double-layer structure into a spiral flow inlet pipe with only a shell into a straight pipe, greatly simplifies the processing difficulty and has high yield; the spiral heat exchange fins are also changed into foam metal with holes, low-temperature gas flows through the heat exchanger of the foam metal and then flows back and is discharged in the reverse direction of high-pressure inlet gas flow, the temperature of inlet gas in the inlet pipe is further reduced until the inlet gas is balanced, therefore, high-pressure argon in the inlet pipe is precooled before throttling, and the temperature of a probe is lower after throttling.

Drawings

FIG. 1: the structure of the existing argon-helium cryotip is schematically shown.

FIG. 2: the invention has a structure schematic diagram.

In the figure: 1. the temperature measuring probe comprises an outer tube, 2 inner tubes, 3 long rods, 4 temperature measuring sensors, 5 flow inlet tubes, 6 fins, 7 probe body shells, 8 straight tubes, 9 metal heat exchangers, 10 pores, 11 thermocouples, 12 conductive long rods and 13 expansion cavities.

Detailed Description

The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.

As shown in fig. 2, the low-temperature probe of the medical foam metal heat exchanger comprises a probe body shell 7, an inflow pipe and a heat exchanger which are arranged in the probe body shell, and a long conductive rod 12 with a thermocouple 11 at the end part, the front end part of the probe body shell 7 forms a working tip, the heat exchanger is positioned between the outer wall of the inflow pipe and the inner wall of the probe body shell 7, the inflow pipe is a straight pipe 8 which is coaxial with the probe body shell 7 and has an opening at the front end, the long conducting rod is arranged in the straight pipe 8 and extends out of the opening, the thermocouple 11 at the end part of the long conducting rod 12 is positioned in an inner cavity at one side of the front end of the probe body shell 7, the inner cavity is also an expansion cavity 13 for gas throttling, the heat exchanger is a metal heat exchanger 9 with pores 10, the metal heat exchanger 9 is made of foam copper which continuously extends along the length direction of the shell of the probe body, the continuous extending length of the foam copper is 13cm, and the porosity is 50 PPI.

When the device is used, high-pressure argon in the straight pipe is sprayed from the front end opening to expand and throttle, the pressure of the expanded argon is rapidly reduced, the temperature of the argon is rapidly reduced, low-temperature argon flows through the foamy copper and is reversely refluxed and discharged relative to high-pressure inlet air flow, so that the temperature for replacing the foamy copper is continuously reduced, the temperature of the argon in the straight pipe is reduced by the foamy copper through conduction heat exchange, the foamy copper is continuously and continuously carried out, the temperature of the inflow argon is gradually reduced until the inflow argon is balanced, the working part at the front end of the low-temperature probe can obtain lower temperature, the cooling time of the probe is greatly shortened, and the device is more.