Lung positioning needle easy to recycle

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to an easy-to-recover lung positioning needle which comprises a puncture assembly, a tube pushing assembly and a positioning assembly. The positioning line and the positioning anchor are hollow and are communicated with each other to form a medium channel, the positioning anchor is made of a memory alloy material, and in an initial state, the positioning line is located in the inner needle tube and extends out of an inner needle handle connected with the inner needle tube; the positioning anchor has a recovery state which is located at the end, close to the needle tip, in the outer needle tube and located outside the inner needle tube, an anchoring state which is obtained after the outer needle tube is pushed out, and an anchor releasing state which is obtained when the medium channel is filled with the cooling medium. During subsequent secondary positioning, the positioning line is pulled through the tube pushing assembly so that the positioning anchor can be recycled into the outer needle tube, then secondary positioning is conducted through puncturing again, or when the positioning anchor needs to be recycled, the positioning anchor can be directly pulled out through the positioning line.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an easily recyclable lung positioning needle. Background Art

[0002] With the development of imaging diagnostic technology, the discovery of early lung lesions has become easier and earlier, and the detection rate of small lung nodules that require surgical treatment has also become easier and easier. Generally, when removing lung lesions less than 1 cm in size, preoperative positioning is performed, that is, the small lung nodules are positioned by percutaneous puncture under CT guidance; preoperative positioning usually uses a positioning needle, and the metal wire with a positioning hook at the end is used as a positioning anchor.

[0003] At present, the lung localization needle is a lung nodule localization needle with application number CN2023208202152 previously applied by the applicant. It is mainly composed of a puncture component, a push tube component and a positioning component, which can achieve a good positioning effect. However, it is found in clinical practice that when the existing lung localization needle is used to locate lung tissue, it is difficult to remove the positioning needle if the positioning is found to be deviated or after the positioning is completed. The reason is that the positioning anchor at the end of the positioning component is made of metal wire, which is relatively firm after the tissue is pushed for positioning. Manual pulling out will cause secondary damage such as tissue bleeding. If it is removed through surgical incision, it will also increase the patient's pain and medical costs. Therefore, it is a more urgent clinical need to develop a lung localization needle that is easy to locate and easy to remove. Summary of the invention

[0004] The purpose of the present invention is to provide an easily retrievable lung positioning needle, which can inject a cooling medium into the medium channel to make the positioning anchor in an unanchored state, and then the positioning anchor is separated from the tissue. Subsequently, according to the actual application scenario, another puncture can be selected for secondary positioning or the positioning anchor can be directly recovered.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An easily recyclable lung positioning needle comprises a puncture assembly, wherein the puncture assembly comprises an outer needle tube and an outer needle handle connected to the outer needle tube;

[0007] A push tube assembly, the push tube assembly comprising an inner needle tube and an inner needle handle connected to the inner needle tube;

[0008] A positioning assembly, the positioning assembly comprising a positioning line and a positioning anchor connected to each other;

[0009] The interiors of the positioning wire and the positioning anchor are both hollow and interconnected to form a medium channel. The positioning anchor is made of memory alloy, and in an initial state, the inner needle tube is located inside the outer needle tube, and the positioning wire is located inside the inner needle tube and extends from an inner needle handle connected to the inner needle tube. The positioning anchor has a recovery state in which one end is located inside the outer needle tube close to the needle tip and outside the inner needle tube, an anchoring state after the outer needle tube is pushed out, and an unanchoring state when the medium channel is filled with cooling medium.

[0010] In a preferred embodiment, the memory alloy material is nickel-titanium alloy material.

[0011] In a preferred embodiment, the positioning anchor includes a connecting portion and a positioning claw connected to the connecting portion, wherein the positioning claw is any one of a single claw, two claws, three claws, and four claws.

[0012] In a preferred solution, the positioning wire is made of polymer material, and the positioning wire and the positioning claw are connected via a connecting portion.

[0013] In a preferred embodiment, a channel for sliding the inner needle tube and the inner needle handle is provided inside the outer needle handle, and a guide groove is provided axially inside the outer needle handle, a slider matching the guide groove is provided on the outer side of the inner needle handle, and a limiting groove matching the slider is provided on one side of the guide groove.

[0014] In a preferred embodiment, the cooling medium is any one of cooling water and cooling liquid.

[0015] In a preferred embodiment, the unanchoring state is that the positioning anchor becomes soft.

[0016] In a preferred embodiment, the unanchored state is a state in which the positioning anchor is deformed and unanchored.

[0017] In a preferred embodiment, the unanchored state is a state in which the positioning anchor becomes soft and deformed and the anchoring state is released.

[0018] The technical effect achieved by the present invention is: when the positioning component needs to be pulled out, a cooling medium is injected through the end of the positioning wire away from the positioning anchor, so that the cooling medium enters the interior of the positioning anchor, and the low temperature will change the inherent properties of the positioning anchor made of nickel-titanium alloy, so that the positioning anchor is switched from an anchored state to an unanchored state. At this time, the anchoring force can be greatly reduced, which facilitates the removal of the positioning component, and the removal process is not easy to damage the tissue. Whether in the secondary positioning process or in the process of directly pulling out the positioning anchor, it can achieve better results. Compared with conventional positioning needles, this method is more conducive to secondary positioning or recovery of the positioning anchor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 The present invention Figure 1 Exploded diagram of

[0021] Figure 3 is a cross-sectional view of an embodiment of the present invention;

[0022] Figure 4 The present invention Figure 1 The enlarged view of point A in the middle;

[0023] Figure 5 The present invention Figure 3 The enlarged view of point B in the middle;

[0024] Figure 6 The present invention Figure 3 Enlarged view of point C in the middle.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 1. puncture assembly; 10. outer needle tube; 11. outer needle handle;

[0027] 2. Push tube assembly; 20. Inner needle tube; 21. Inner needle handle;

[0028] 3. Positioning assembly; 30. Positioning line; 31. Positioning anchor; 310. Connecting part; 311. Positioning claw. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Example 1

[0034] Please see attached Figures 1 to 4 As shown, it is the first embodiment of the present invention, which provides an easily recyclable lung positioning needle, which includes a puncture assembly 1, a push tube assembly 2 and a positioning assembly 3;

[0035] Among the above components, the puncture component 1 includes an outer needle tube 10 and an outer needle handle 11 connected to the outer needle tube 10, the push tube component 2 includes an inner needle tube 20 and an inner needle handle 21 connected to the inner needle tube 20, and the positioning component 3 includes a positioning line 30 and a positioning anchor 31 connected to each other.

[0036] Based on the above components, the interiors of the positioning wire 30 and the positioning anchor 31 are both hollow and interconnected to form a medium channel. The positioning anchor 31 is made of memory alloy (nickel-titanium alloy), and in the initial state, the inner needle tube 20 is located inside the outer needle tube 10, and the positioning wire 30 is located inside the inner needle tube 20 and extends from the inner needle handle 21 connected to the inner needle tube 20. The positioning anchor 31 has a recovery state in which one end is located inside the outer needle tube 10 close to the needle tip and outside the inner needle tube 20, an anchored state after the outer needle tube 10 is pushed out, and an unanchored state when the medium channel is filled with cooling medium.

[0037] When in use, in the initial state, the positioning anchor 31 is in a state of being straightened and retracted into the outer needle tube 10. Under the guidance of imaging, the lung positioning needle is percutaneously punctured into the lung diseased tissue, and the push tube assembly is pushed to push the positioning anchor 31 out of the outer needle tube 10 into the diseased tissue to complete the positioning. At this time, the positioning assembly 3 is in an anchored state, and the outer needle tube 10 and the inner needle tube 20 are taken out, that is, the lung tissue positioning is completed, and the diseased tissue can be clearly observed under imaging through the positioning anchor; when the positioning assembly 3 needs to be pulled out, a cooling medium (wherein the cooling medium is cooling water or other cooling liquid with cooling capacity) is injected through the end of the positioning line 30 away from the positioning anchor 31, so that the cooling medium enters the interior of the positioning anchor 31, and the low temperature will change the inherent properties of the positioning anchor 31 made of nickel-titanium alloy, so that the positioning anchor 31 is switched from an anchored state to an unanchored state. At this time, the anchoring force can be greatly reduced, which is convenient for pulling out the positioning assembly 3 and is not easy to damage the tissue.

[0038] It should be further explained that the positioning anchor 31 includes a connecting portion 310 and a positioning claw 311 that is connected to the connecting portion 310, wherein the positioning claw 311 is any one of a single claw, two claws, three claws, and four claws. The positioning line 30 is made of polymer material, and the positioning line 30 and the positioning claw 311 are connected through the connecting portion 310. The positioning line 30 is made of soft material, and a composite material with an inner metal wire (hollow) and an outer layer of nylon can be selected here. A positioning mark (not shown in the figure) is provided on the positioning line 30 for feedback of depth to facilitate accurate positioning; the positioning mark can be an ink mark (that is, a color mark is printed on the positioning line 30), or a metal mark can be added to the positioning line, or a mark can be directly etched on the positioning line 30 using a laser or other process, etc. The connecting portion 310 is actually a structure similar to an interface, and its structural selection only requires that it can normally connect the positioning anchor 31 and the positioning line 30 and ensure good sealing performance, and no specific limitation is made here.

[0039] In one of the preferred embodiments, taking a single claw as an example, the unanchoring state is that the positioning anchor 31 becomes soft, and the cooling medium enters into the medium channel. The low temperature will change the inherent properties of the positioning anchor 31 made of nickel-titanium alloy, making the positioning anchor soft, and the anchoring force is greatly reduced, which is convenient for pulling out the positioning component 3 and is not easy to damage the tissue. Compared with the conventional method of directly pulling out the positioning anchor 31, it causes less damage to the tissue. Specifically, when there is a positioning deviation and secondary positioning is required, first when pulling out, when the positioning anchor 31 becomes soft, the positioning line 30 is pulled by operating the push tube assembly 2, and the positioning anchor 31 is pulled, so that the positioning anchor 31 is unanchored and retracted into the outer needle tube 10, and then secondary positioning is performed. When the positioning anchor is directly recovered, the positioning line 30 can be directly pulled to make the positioning anchor detach from the tissue and then taken out.

[0040] In order to better illustrate the property change of the positioning anchor 31, here, the nickel-titanium alloy is a one-way memory alloy, and its state is low in hardness at low temperature (generally below 10°C). When it is punctured, it is pushed out of the outer needle tube 10. Since the temperature of the lesion is close to the human body temperature, for the positioning anchor 31, after the temperature of the environment in which it is located increases, it can be unfolded and hardened, thereby achieving a good anchoring state. When it is in the unanchoring state, as the cooling medium is introduced, the positioning anchor 31 is affected by the low temperature, and its hardness becomes lower, and then when it is pulled out, the damage to the tissue is smaller. The inherent properties of the nickel-titanium alloy are briefly explained here. At a lower temperature, the nickel-titanium alloy is in the martensite phase, which is a softer and easier to deform phase. When the temperature rises to above the austenite transition temperature, the nickel-titanium alloy undergoes a phase change and transforms into the austenite phase. The alloy in this phase has a higher hardness and has shape memory properties. If deformation occurred at a low temperature before, the alloy will automatically return to its original shape, that is, the unfolded state, after heating.

[0041] In addition to the advantage of facilitating anchor release, the above-mentioned method also facilitates the recovery of the positioning anchor 31. Due to the above-mentioned characteristics of the positioning anchor 31, when it is recovered or used before surgery, it becomes softer and easier to enter the outer needle tube 10. Whether it is the first insertion or the subsequent insertion after recovery, it is obviously more convenient and quicker than the conventional insertion that relies on its deformation.

[0042] Further, combined with Figure 2 and Figure 3 As shown, in order to facilitate the relative sliding or fixing of the outer needle handle 11 and the inner needle handle 21, a channel for the inner needle tube 20 and the inner needle handle 21 to slide is provided inside the outer needle handle 11, and a guide groove is provided axially inside the outer needle handle 11, a slider matching the guide groove is provided on the outer side of the inner needle handle 21, and a limiting groove matching the slider is provided on one side of the guide groove.

[0043] Based on the above technical solution, the solution of patent (CN2023208202152) is cited here, combined with the attached specification Figure 3 to Figure 4 The specification discloses that a guide groove (not shown in the figure) is axially provided in the outer needle handle 11, a slider 23 matching the guide groove is provided on the outer side of the inner needle handle 21, and a limiting groove 12 matching the slider 23 is provided on one side of the guide groove. When the inner needle handle 21 is rotated to make the slider 23 sink into the limiting groove 12, the outer needle handle 11 and the inner needle handle 21 can be fixed together.

[0044] Example 2

[0045] This embodiment is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is only the difference in the unanchoring state.

[0046] In this embodiment, the unanchored state is that the positioning anchor 31 is deformed and released from the anchoring state. In this state, the inner nickel-titanium alloy used to make the positioning anchor 31 is a two-way memory alloy. When it is positioned, after being pushed out from the outside of the outer needle tube 10, the lung temperature is close to the human body temperature and the relative temperature is relatively high. At this time, the positioning claw 311 of the positioning anchor 31 is unfolded, and the positioning point can be anchored at this time, that is, the anchoring state. In the unanchored state, when the medium reaches the inside and the cooling medium is passed into the inside, the internal temperature of the positioning claw 311 is reduced. At this time, the positioning claw 311 is withdrawn from the tissue in the low temperature state and turned into a contracted state. When it is recovered at this time, no other damage is caused to the assembly, and the positioning claw 311 is withdrawn by itself, which causes less damage than the conventional pulling method.

[0047] It should be noted that the two-way memory alloy of the positioning anchor 31 can be obtained by multiple training of the one-way memory alloy. In the specific training process, in order to obtain the two-way memory effect, the alloy needs to be subjected to specific "memory training", including repeated heating / cooling and deformation treatment, to ensure that the alloy can maintain two different shapes at different temperatures. This method has been disclosed or disclosed in the prior art. Similarly, its deformation temperature is not fixed, but can be changed by adjusting the composition of the alloy, heat treatment process and mechanical training. Therefore, when designing a specific application, the phase change temperature of the alloy can be customized as needed, which has also been disclosed or disclosed in the prior art, so no specific repetition will be made here. It only needs to meet the above requirements, so it will not be repeated.

[0048] Example 3

[0049] This embodiment is the third embodiment of the present invention. The difference between this embodiment and the first embodiment is only in the different unanchoring state.

[0050] In this embodiment, the unanchored state is a state in which the positioning anchor 31 becomes soft and deformed and the anchoring is released.

[0051] The above-mentioned softening and deformation have been introduced in detail in Example 1 and Example 2. Here, the two-way memory alloy is selected in combination with the low-temperature softening property of nickel-titanium alloy. The purpose of this design is that the positioning anchor 31 does not need to be completely contracted during low-temperature resetting, but only needs to meet slight deformation (the low-temperature deformation requirement of the memory alloy is not high), release the initial anchoring state, and cooperate with its softening. When it is pulled out, it can still minimize damage to the tissue. The advantage of this method is that its training intensity is not large, and only a small deformation amount needs to be met.

[0052] Example 4

[0053] This embodiment is the fourth embodiment of the present invention. The difference between this embodiment and embodiment 1 is that a fixing structure of the positioning line is added. Specifically:

[0054] The positioning line 32 passes through the inner needle tube 20, and the other end of the positioning line 32 away from the positioning anchor 31 extends out of the inner needle tube 20 and is detachably fixed to the inner needle handle 21. There are many embodiments for fixing the positioning line 32 on the inner needle handle 21, preferably, Figure 2 and Figure 3As shown, in this embodiment, the inner needle handle 21 is provided with a plurality of wire grooves 25 and a pressure ring 22 matching the wire grooves 25 on its circumference, and the positioning wire 32 is wound around the wire grooves 25 of the inner needle handle 21 and fixed by the pressure ring 22 sleeved on the outer side of the inner needle handle 21. At this time, the positioning wire 32 is squeezed between the inner side of the pressure ring 22 and the wire groove 25, so that the positioning wire 32 is temporarily fixed to the inner needle handle 21. The angle between the wire groove 25 and the axis of the inner needle is preferably less than 60 degrees, and it is best to have the wire groove 25 parallel to the axis of the inner needle. At this time, the positioning wire 32 is more easily squeezed between the wire groove 25 and the pressure ring 22.

[0055] Combined with the above records, the relative sliding or fixing scheme of the outer needle handle 11 and the inner needle handle 21 has been clearly explained, and no further details will be given here. For detailed records, please refer to the patent cited in the background technology. However, when the wire groove and the pressure ring are squeezed to extrude the positioning line 32, it should also be satisfied that the positioning line 30 will not be squeezed and deformed, that is, the built-in metal wire of the positioning line 30 of the present application will not be blocked. The marks in the above records are only marks in the reference documents, and may overlap with some marks in the present application, but they are not the same structure.

[0056] The working principle of the present invention is as follows: the method of using the positioning needle in this embodiment is a prior art, and the specification of the cited patent can be referred to, which is briefly described as follows: the doctor uses the puncture assembly 1 to make the outer needle tube 10 reach the lung diseased tissue, and then drives the positioning anchor 31 to extend the outer needle tube 10 and pierce the diseased tissue through the push tube assembly 2. The improvement of this embodiment relative to the prior art is that: the positioning line 30 and the positioning anchor 31 form a medium channel inside, which can be used for the subsequent introduction of cooling medium. If the positioning is not accurate due to improper operation, the cooling medium can be injected into the medium channel to make the state of the positioning anchor 31 an unanchored state, and then the push tube assembly 2 pulls the positioning line 30 to retract the positioning anchor 31 into the outer needle tube 10, and then punctures again for secondary positioning or retrieving the positioning anchor 31. When removing the positioning anchor 31, the positioning line 30 can be directly pulled to separate the positioning anchor from the tissue, and then it can be removed.

[0057] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. An easily retrievable lung localization needle, comprising: A puncture assembly (1), the puncture assembly (1) comprising an outer needle tube (10) and an outer needle handle (11) connected to the outer needle tube (10); A push tube assembly (2), the push tube assembly (2) comprising an inner needle tube (20) and an inner needle handle (21) connected to the inner needle tube (20); A positioning assembly (3), the positioning assembly (3) comprising a positioning line (30) and a positioning anchor (31) connected to each other; The invention is characterized in that the interior of the positioning line (30) and the positioning anchor (31) are both hollow and interconnected to form a medium channel, the positioning anchor (31) is made of memory alloy, and in the initial state, the inner needle tube (20) is located inside the outer needle tube (10), and the positioning line (30) is located inside the inner needle tube (20) and extends from the inner needle handle (21) connected to the inner needle tube (20), and the positioning anchor (31) has a recovery state in which one end is located inside the outer needle tube (10) close to the needle tip and outside the inner needle tube (20), an anchoring state after the outer needle tube (10) is pushed out, and an unanchoring state when the medium channel is filled with cooling medium.

2. The easily retrievable lung localization needle according to claim 1, characterized in that: The memory alloy is made of nickel-titanium alloy.

3. The easily retrievable lung localization needle according to claim 1, characterized in that: The positioning anchor (31) comprises a connecting portion (310) and a positioning claw (311) in electrical communication with the connecting portion (310), wherein the positioning claw (311) is any one of a single claw, two claws, three claws, and four claws.

4. The easily retrievable lung localization needle according to claim 3, characterized in that: The positioning wire (30) is made of polymer material, and the positioning wire (30) and the positioning claw (311) are connected via the connecting portion (310).

5. The easily retrievable lung localization needle according to any one of claims 1 to 4, characterized in that: The outer needle handle (11) is provided with a passage for the inner needle tube (20) and the inner needle handle (21) to slide, and a guide groove is provided axially inside the outer needle handle (11), a slider matching the guide groove is provided on the outer side of the inner needle handle (21), and a limit groove matching the slider is provided on one side of the guide groove.

6. The easily retrievable lung localization needle according to claim 1, characterized in that: The cooling medium is any one of cooling water and cooling liquid.

7. The easily retrievable lung localization needle according to any one of claims 1 to 4 and 7, characterized in that: The anchor release state is that the positioning anchor (31) becomes soft.

8. The easily retrievable lung localization needle according to claims 1-4 and 7, characterized in that: The unanchoring state is a state in which the positioning anchor (31) is deformed and the anchoring is released.

9. The easily retrievable lung localization needle according to claims 1-4 and 7, characterized in that: The unanchoring state is a state in which the positioning anchor (31) becomes soft and deforms and the anchoring is released.

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