Anti-blocking probe head of cryoprobe

Abstract

The utility model discloses an anti-blocking probe head of a cryoprobe, relates to the technical field of medical instruments, and can solve the problems that the length of an overall air injection channel of the existing cryoprobe is too long, and the blocking phenomenon is easy to occur. The anti-blocking probe head of the cryoprobe comprises a high-pressure gas-guide tube and a low-pressure gas-guide tube which are sleeved inside and outside, and a cryogenic end which is fixedly connected with the end part of the low-pressure gas-guide tube in a sealing manner, a pressure relief cavity is formed in the freezing end, the end of the high-pressure air guide pipe is a closed end, and an air nozzle facing the pressure relief cavity is formed in the closed end of the high-pressure air guide pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an anti-clogging probe head of a freezing probe. Background Art

[0002] The cryoprobe is primarily used for sampling or inactivating lung lesions. Its principle, based on the Joule-Thomson effect, uses high-pressure gas to rapidly release pressure at the cryoprobe's needle, achieving extremely rapid cooling, reaching ultra-low temperatures below -60°C at the cryoprobe tip. After the cryoprobe is inserted through the bronchus into the lungs, the cryoadhesion effect causes the lesion to adhere to the cryoprobe's needle, allowing for removal or direct freezing and inactivation.

[0003] The entire system usually includes an air source, an air control device, and a cryoprobe. Due to the industry specificity of the medical device field, carbon dioxide is usually selected as the air source, which can be directly discharged into the air. The cryoprobe part of the entire system includes structures such as an airway and a needle. Since it needs to be inserted into the human body through a natural cavity, the diameter of the airway and needle is extremely small, especially the nozzle size of the needle is extremely small.

[0004] At present, the jet nozzle of the needle is usually made by extrusion processing, which determines that the structure of the high-pressure air guide tube of the needle includes at least a diameter reduction section and a sizing section, resulting in the need for the air jet to pass through a long channel before it is ejected. Figure 1 As shown, when the nozzle diameter is extremely small, the excessively long diameter reduction section and sizing section length can easily cause the carbon dioxide to freeze into dry ice after being reduced to an ultra-low temperature, blocking the nozzle and causing the needle refrigeration to fail. To solve the above problem, the existing solution is usually to cut off a part of the sizing section to shorten the length of the sizing section, but the overall jet channel length is still too long, and clogging still occurs from time to time; in addition, since the existing nozzle shape is usually a straight mouth shape, and the pressure relief cavity in the freezing end is a cylindrical groove, after the system is started, turbulence is easily formed in the pressure relief cavity in the initial stage of exhaust, and the exhaust cannot be quickly and smoothly, affecting the cooling efficiency of the freezing end.

[0005] Based on the above background, the inventors have designed an anti-clogging probe head for a cryoprobe, which can solve at least one of the above problems, and thus proposed the present application. Utility Model Content

[0006] The purpose of this application is to provide an anti-clogging probe head for a cryoprobe to solve the above problems.

[0007] In order to solve the above technical problems, the present invention adopts the following solutions:

[0008] The present application provides an anti-clogging probe head for a cryoprobe, comprising a high-pressure airway tube and a low-pressure airway tube arranged inside and outside, and a cryoend that is sealed and fixedly connected to the end of the low-pressure airway tube;

[0009] A pressure relief chamber is provided in the freezing end head, and the end of the high-pressure air guide tube is a closed end head, on which an air jet port is provided facing the pressure relief chamber.

[0010] Optionally, the air jet is a thin-walled air jet located in the middle of the closed end.

[0011] Optionally, the axis of the thin-walled air jet is arranged perpendicular to the closed end head.

[0012] Optionally, the shape of the thin-walled air jet is any one of circular, elliptical, and rectangular.

[0013] Optionally, a blocking column is embedded and fixed at the end of the high-pressure air guide tube, and the outer peripheral wall of the blocking column is sealed and fixedly connected to the inner peripheral wall of the end of the high-pressure air guide tube to form a closed end head;

[0014] The air injection port is arranged along the axial direction of the blocking column and penetrates the blocking column.

[0015] Optionally, the air jet includes an expansion outlet section, and the exhaust end of the expansion outlet section is arranged toward the pressure relief chamber.

[0016] Optionally, the air jet further includes a straight outlet section, and the expanded outlet section is connected to the inner cavity of the high-pressure air duct through the straight outlet section.

[0017] Optionally, the expansion outlet section is in the shape of a circular trumpet.

[0018] Optionally, the shape of the side of the pressure relief chamber facing the air jet outlet is curved.

[0019] Optionally, the curved shape is hemispherical.

[0020] In another aspect, the present application provides a method for manufacturing the aforementioned anti-clogging probe head of the cryoprobe, comprising the following steps:

[0021] S1. Seal the end of the high-pressure airway tube to isolate the inner cavity of the high-pressure airway tube and the pressure relief cavity of the freezing end;

[0022] S2. Punch a hole at the end of the closed high-pressure air duct to create an air jet.

[0023] In S1, the high-pressure air duct end is sealed by inserting a sealing plunger into the end and then welding it, or the end of the high-pressure air duct is directly squeezed and then sealed.

[0024] In S2, holes are punched using a laser punching method.

[0025] Beneficial effects of the utility model:

[0026] 1. This application eliminates the need for a reduced diameter section at the end of the original high-pressure air duct by directly setting an air jet at the sealed end of the high-pressure air duct. At the same time, the length of the narrow air path is reduced by at least half on the basis of the fixed diameter section, which can effectively solve the problem that the needle structure is easily blocked by carbon dioxide after cooling, thereby affecting refrigeration.

[0027] 2. This application improves the shape design of the pressure relief chamber, and designs the shape of the pressure relief chamber facing the air jet port to be hemispherical. At the moment of system startup, after the high-pressure carbon dioxide gas is ejected from the air jet port, it can flow smoothly along the semicircular curved surface into the low-pressure air duct after pressure relief, effectively avoiding air flow turbulence and the problem of low cooling rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic cross-sectional view of the prior art of this application.

[0029] Figure 2 This is a schematic cross-sectional structural diagram of Example 1 of the present application.

[0030] Figure 3 This is a schematic cross-sectional structural diagram of Example 2 of the present application.

[0031] Figure 4 This is a schematic cross-sectional structural diagram of Example 3 of the present application.

[0032] Explanation of the reference numerals: 1- low-pressure air duct, 2- freezing end, 21- pressure relief chamber, 3- high-pressure air duct, 31- reducing section, 32- sizing section, 33- closed end, 331- thin-walled jet outlet, 34- blocking column, 341- straight discharge outlet section, 342- expanded discharge outlet section. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "opened," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] Example 1:

[0038] like Figure 2 As shown, this embodiment provides an anti-clogging probe head of a cryoprobe, comprising a high-pressure airway tube 3 and a low-pressure airway tube 1 arranged inside and outside, and a cryoend 2 sealed and fixedly connected to the end of the low-pressure airway tube 1;

[0039] A pressure relief chamber 21 is provided in the freezing end head 2 , and the end of the high-pressure air guide tube 3 is a closed end head 33 , on which an air jet is provided facing the pressure relief chamber 21 .

[0040] In the prior art, reference Figure 1 As shown, after the end of the high-pressure air guide tube 3 is rotated and extruded, the end of the high-pressure air guide tube 3 is not directly sealed. Therefore, it has a reduced diameter section 31 and a fixed diameter section 32, resulting in a long sum of their lengths. As a result, the carbon dioxide gas needs to travel a long distance before being ejected, which greatly increases the probability of clogging of the needle structure.

[0041] In this embodiment, the air injection port is directly provided at the end of the blocked high-pressure air duct 3, thereby eliminating the original reduced diameter section 31 at the end of the high-pressure air duct 3. At the same time, the length of the narrow air path is reduced by at least half on the basis of the sizing section 32, which can effectively solve the problem that the needle structure is easily blocked by carbon dioxide after cooling, thereby affecting refrigeration.

[0042] Specifically, in this embodiment, Figure 2 As shown, the end of the low-pressure air duct 1 is a closed end head 33 , and the air jet is a thin-walled air jet 331 located in the middle of the closed end head 33 .

[0043] Specifically, in this embodiment, the axis of the thin-walled air jet 331 is arranged perpendicular to the closed end head 33 , so as to facilitate rapid exhaust of the thin-walled air jet 331 .

[0044] Specifically, the length of the thin-walled air injection port 331 is the same as the wall thickness of the high-pressure air duct 3 .

[0045] Specifically, the shape of the thin-walled air jet 331 is any one of a circle, an ellipse, and a rectangle. The air jet in this embodiment is also a circle that is easy to process. Technicians can choose to process it into other shapes such as an ellipse, a rectangle, etc. as needed.

[0046] Example 2:

[0047] Specifically, in this embodiment, Figure 3 As shown, the shape of the pressure relief chamber 21 facing the air jet outlet is curved.

[0048] Specifically, in this embodiment, the curved shape is hemispherical. By improving the shape design of the pressure relief chamber 21, the pressure relief chamber 21 on the side facing the air jet is designed to be hemispherical. At the moment of system startup, after the high-pressure carbon dioxide gas is ejected from the air jet, it can flow smoothly along the semicircular curved surface into the low-pressure air duct 1 after the pressure is released, effectively avoiding airflow turbulence that leads to a low cooling rate.

[0049] The rest of the structure of this embodiment is the same as that of the above-mentioned embodiment 1.

[0050] Example 3:

[0051] Specifically, in this embodiment, Figure 4 As shown, a blocking column 34 is embedded and fixed at the end of the high-pressure air duct 3, and the outer peripheral wall of the blocking column 34 is sealed and fixedly connected to the inner peripheral wall of the end of the high-pressure air duct 3;

[0052] The air jet is provided on the blocking column 34 along the axial direction thereof. The blocking column 34 in this embodiment is made of metal and can be sealed and fixed to the inner peripheral wall of the end of the high-pressure air duct 3 by welding to prevent high-pressure carbon dioxide gas from leaking from non-air jets and affecting the cooling effect.

[0053] Specifically, in this embodiment, the air jet includes an expansion outlet section 342, and an exhaust end of the expansion outlet section 342 is disposed toward the pressure relief chamber 21. The expansion outlet section 342 can facilitate rapid exhaust.

[0054] Specifically, in this embodiment, Figure 4 As shown, the air jet includes a straight outlet section 341 and an expanded outlet section 342 , and the expanded outlet section 342 is connected to the inner cavity of the high-pressure air duct 3 through the straight outlet section 341 .

[0055] Specifically, in this embodiment, the straight discharge outlet section 341 and the expanded discharge outlet section 342 are equal in length.

[0056] Specifically, the expanded outlet section 342 is in the shape of a circular trumpet. In some embodiments, the circular trumpet shape can be replaced with a square trumpet shape or the like.

[0057] The rest of the structure of this embodiment is the same as that of embodiment 2 and will not be described here in detail.

[0058] Example 4:

[0059] This embodiment provides a method for manufacturing an anti-clogging probe head of a cryoprobe, comprising the following steps:

[0060] S1. Seal the end of the high-pressure air duct 3 to isolate the inner cavity of the high-pressure air duct 3 and the pressure relief cavity 21 of the freezing terminal 2 from each other;

[0061] S2. Punch a hole at the end of the closed high-pressure air duct 3 to create an air jet.

[0062] In S1 , the end of the high-pressure air duct 3 is sealed by inserting a sealing column 34 into the end thereof and then welding the end thereof, or directly squeezing the end thereof and then sealing the end thereof.

[0063] In S2, holes are punched using a laser punching method.

[0064] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will be able to make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A cryoprobe anti-clogging probe head, comprising a high-pressure airway tube (3) and a low-pressure airway tube (1) arranged inside and outside the probe head, and a cryoend (2) sealed and fixedly connected to the end of the low-pressure airway tube (1); The freezing end head (2) is provided with a pressure relief chamber (21), which is characterized in that: The end of the high-pressure air guide pipe (3) is a closed end head (33), and the closed end head (33) is provided with an air jet port arranged toward the pressure relief chamber (21).

2. The anti-clogging probe head of the cryoprobe according to claim 1, characterized in that: The air jet is a thin-walled air jet (331) located in the middle of the closed end (33).

3. The anti-clogging probe head of the cryoprobe according to claim 2, characterized in that: The axis of the thin-walled air jet (331) is arranged perpendicular to the closed end (33).

4. The anti-clogging probe head of the cryoprobe according to claim 2, characterized in that: The shape of the thin-walled air jet (331) is any one of circular, elliptical and rectangular.

5. The anti-clogging probe head of the cryoprobe according to claim 1, characterized in that: A blocking column (34) is embedded and fixed at the end of the high-pressure air guide tube (3), and the outer peripheral wall of the blocking column (34) is sealed and fixedly connected to the inner peripheral wall of the end of the high-pressure air guide tube (3) to form a closed end head (33); The air jet is arranged along the axial direction of the blocking column (34) and penetrates the blocking column (34).

6. The anti-clogging probe head of the cryoprobe according to claim 5, characterized in that: The jet port comprises an expansion port section (342), and an exhaust end of the expansion port section (342) is arranged toward the pressure relief chamber (21).

7. The anti-clogging probe head of the cryoprobe according to claim 6, characterized in that: The air jet also includes a straight discharge port section (341), and the expanded discharge port section (342) is communicated with the inner cavity of the high-pressure air guide tube (3) through the straight discharge port section (341).

8. The anti-clogging probe head of the cryoprobe according to claim 6, characterized in that: The expanded outlet section (342) is in the shape of a circular bell mouth.

9. The anti-clogging probe head of a cryoprobe according to any one of claims 1 to 8, characterized in that: The shape of the pressure relief chamber (21) facing the air jet outlet is curved.

10. The anti-clogging probe head of the cryoprobe according to claim 9, characterized in that: The curved shape is hemispherical.

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