A puncture needle for radiotherapy

Abstract

The present invention provides a puncture needle for radiotherapy, comprising a trocar and a hollow needle, wherein the trocar is a hollow tube with a closed front end, the hollow needle is a needle-like object with two ends connected, the trocar is arranged parallel to the central axis of the hollow needle, and the trocar and the hollow needle are connected into a whole by welding or integral molding. A double needle setting is adopted, the trocar is used for radiotherapy to avoid contamination, and the hollow needle is used for "blood return", which is convenient for observing the situation during the puncture process and improving the safety of the patient's treatment process; the front end of the puncture needle adopts an inclined surface setting, and the puncture resistance is smaller; the present invention is easy to operate and easy to promote.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to a puncture needle for radiotherapy. Background Art

[0002] Radiotherapy is a tumor treatment method that uses radiation to kill cancer cells. Currently, radiotherapy is one of the three major methods of tumor treatment, and about 65% to 75% of patients need to receive radiotherapy. Among them, X-rays, electron beams and heavy ion beams generated by accelerators are the most effective in tumor treatment.

[0003] Traditional electron beams are widely used to treat skin and superficial tumors, but due to the low penetration of electrons, they cannot directly enter the deep lesions below the skin. In the prior art, small electron accelerators represented by the Mobetron mobile electron beam intraoperative radiotherapy system produced by Intraop in the United States are widely used in treatment during surgery. The notable feature of this electron beam intraoperative radiotherapy system is that after surgical resection of the tumor (the wound diameter is usually about 5 cm), an electron beam is used to irradiate near the original location of the tumor lesion to eliminate residual tumor cells or tissues. This intraoperative radiotherapy method is a beneficial supplement to tumor surgery. However, for tumors that cannot be surgically removed, this intraoperative radiotherapy method will no longer be applicable. This team has studied a new tumor treatment device and its use method (Chinese patent application number 201810907457.9), in which a cannula needle is used to puncture the tumor target area, and then the beam needle enters the cannula needle, and then the electron accelerator generates high-energy electrons to radiotherapy the tumor. In order to ensure that the beam needle is not contaminated, the tip of the cannula needle is closed. In this way, there will be no "blood return" after trocar puncture, and the condition of the needle tip cannot be seen. Even if a problem occurs, the doctor cannot clearly understand the patient's condition and cannot take any measures.

[0004] "Blood return" principle: When the puncture needle penetrates the blood vessel, the pressure inside the puncture needle is lower than the pressure inside the blood vessel, so the blood will flow back into the puncture needle. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a puncture needle which can prevent the beam needle from being contaminated and can also "return blood".

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a puncture needle for radiotherapy, comprising a trocar and a hollow needle, wherein the trocar is a hollow tube with a closed front end, and the hollow needle is a needle-like object with two ends connected, the trocar is arranged parallel to the central axis of the hollow needle, and the trocar and the hollow needle are connected into a whole by welding or integral molding.

[0008] Preferably, the inner wall of the hollow needle is connected to the trocar, and a blood return channel is formed between the hollow needle and the trocar.

[0009] Preferably, the front end of the hollow needle is a bevel with an inclination angle of 15°-60°, and the front end of the trocar is a round head or a flat head.

[0010] Preferably, the hollow needle is coaxially arranged with the trocar, and the inner wall of the hollow needle is fixedly connected to the outer wall of the trocar via at least two transverse connecting arms.

[0011] In another embodiment, the inner wall of the hollow needle is tangent to the outer wall of the trocar, and the tangent point is fixedly connected.

[0012] In another embodiment, the outer wall of the trocar is connected to the hollow needle, and a blood return channel is formed inside the hollow needle.

[0013] Preferably, the front ends of the hollow needle and the trocar are both beveled, the bevel of the trocar is arranged opposite to the bevel of the hollow needle and intersects at the front end of the puncture needle, the bevel angle of the trocar is 15°-45°, and the bevel angle of the hollow needle is 35°-60°.

[0014] In another embodiment, the outer wall of the hollow needle is tangent to the outer wall of the trocar, and the tangent point is fixedly connected.

[0015] Preferably, the hollow needle is a circular tube with a section of arc cut off, and the axial section of the hollow needle is connected to the outer wall of the trocar.

[0016] In the radiotherapy puncture needle of any technical solution of the present invention, the trocar and the hollow needle are both stainless steel needle and titanium alloy needle.

[0017] Compared with the prior art, the present invention has the following advantages: a double needle setting is adopted, the cannula needle is used for radiotherapy to avoid contamination, and the hollow needle is used for "blood return", which is convenient for observing the situation during the puncture process and improving the safety of the patient's treatment process; the front end of the puncture needle adopts a bevel setting, and the puncture resistance is smaller; the present invention is easy to operate and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of the first embodiment;

[0020] Figure 2 is a schematic top view of the first embodiment;

[0021] Figure 3 for Figure 1 Schematic cross-sectional view of ;

[0022] Figure 4 is a structural schematic diagram of a second embodiment;

[0023] Figure 5 is a schematic top view of a second embodiment;

[0024] Figure 6 for Figure 4 Schematic cross-sectional view of ;

[0025] Figure 7 is a schematic structural diagram of a third embodiment;

[0026] Figure 8 is a top view schematically showing a third embodiment;

[0027] Fig. 9 for Figure 7 Schematic cross-sectional view of ;

[0028] Fig.10 is a schematic structural diagram of a fourth embodiment;

[0029] Fig.11 is a schematic top view of a fourth embodiment;

[0030] Fig.12 for Fig.10 Schematic cross-sectional view of ;

[0031] Figure numerals: 1-trocar, 2-hollow needle, 3-blood return channel, 4-front end, 5-lateral connecting arm. DETAILED DESCRIPTION

[0032] In order to further understand the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] The present invention provides a puncture needle for radiotherapy, comprising a trocar 1 and a hollow needle 2, wherein the trocar 1 is a hollow tube with a closed front end, and the hollow needle 2 is a needle-like object with two ends connected, and the central axis of the trocar 1 and the hollow needle 2 are arranged parallel to each other, and the trocar 1 and the hollow needle 2 are connected into a whole by welding or integral molding.

[0034] For further information, please refer to Figure 1-6 The inner wall of the hollow needle 2 is connected to the trocar 1 , and a blood return channel 3 is formed between the hollow needle 2 and the trocar 1 .

[0035] Furthermore, the front end 4 of the hollow needle 2 is a bevel, and the inclination angle of the bevel is 15°-60°, and the front end 4 of the trocar 1 is a round head or a flat head.

[0036] For the first embodiment, please refer to Figure 1-3 The hollow needle 2 is coaxially arranged with the trocar 1 , and the inner wall of the hollow needle 2 is fixedly connected with the outer wall of the trocar 1 by at least two transverse connecting arms 5 .

[0037] Specifically, the number of the transverse connecting arms 5 in this embodiment is 2, 3, 4, 5, 6, 7, or 8, and there is no other special restriction on the arrangement position of the transverse connecting arms 5, so that the relative position of the hollow needle 2 and the trocar 1 does not change.

[0038] Specifically, the inner diameter of the trocar 1 is 1-4 mm, the wall thickness of the trocar 1 is 0.1-0.5 mm, the inner diameter of the hollow needle 2 is 2-5 mm, the wall thickness of the hollow needle 2 is 0.1-0.5 mm, and the distance between the outer wall of the trocar 1 and the inner wall of the hollow needle 2 is 0.9-3.5 mm.

[0039] For the second embodiment, please refer to Figure 4-6 The inner wall of the hollow needle 2 is tangent to the outer wall of the trocar 1, and the tangent point is fixedly connected.

[0040] Specifically, the inner diameter of the trocar 1 is 1-4 mm, the wall thickness of the trocar 1 is 0.1-0.5 mm, the inner diameter of the hollow needle 2 is 1.75-5 mm, the wall thickness of the hollow needle 2 is 0.1-0.5 mm, and the distance between the center of the trocar 1 and the center of the hollow needle 2 is 0.3-2 mm.

[0041] For another solution, please refer to Figure 7-12 The outer wall of the trocar 1 is connected to the hollow needle 2 , and a blood return channel 3 is formed inside the hollow needle 2 .

[0042] Furthermore, the front ends 4 of the hollow needle 2 and the trocar 1 are both beveled, the bevel of the trocar 1 is arranged opposite to the bevel of the hollow needle 2, and intersect at the front end 4 of the puncture needle, the bevel angle of the trocar 1 is 15°-45°, and the bevel angle of the hollow needle 2 is 35°-60°.

[0043] For the third embodiment, please refer to Figure 7-9 The outer wall of the hollow needle 2 is tangent to the outer wall of the trocar 1, and the tangent point is fixedly connected.

[0044] Specifically, the inner diameter of the trocar 1 is 1-4 mm, the wall thickness of the trocar 1 is 0.5-1 mm, the inner diameter of the hollow needle 2 is 0.5-2 mm, and the wall thickness of the hollow needle 2 is 0.2-0.3 mm.

[0045] In other embodiments, the number of the hollow needles 2 may be 2, 3, or 4, and the outer wall of each of the hollow needles 2 is tangent to the outer wall of the trocar 1, and the tangent points are fixedly connected.

[0046] For the fourth embodiment, please refer to Figure 10-12 The hollow needle 2 is a circular tube with a section of arc cut off, and the axial section of the hollow needle 2 is connected to the outer wall of the trocar 1 .

[0047] Specifically, the inner diameter of the trocar 1 is 1-4 mm, the wall thickness of the trocar 1 is 0.5-1 mm, the inner diameter of the hollow needle 2 is 0.75-2.25 mm, the wall thickness of the hollow needle 2 is 0.2-1 mm, and the center distance between the trocar 1 and the hollow needle 2 is 2-4 mm.

[0048] In other embodiments, the number of the hollow needles 2 may be 2, 3, or 4, and the axial section of each of the hollow needles 2 is connected to the outer wall of the trocar 1 .

[0049] In the radiotherapy puncture needle of any embodiment of the present invention, the material of the trocar 1 and the hollow needle 2 can be selected from materials that meet the biocompatibility requirements, preferably a stainless steel needle or a titanium alloy needle.

[0050] The method of using this embodiment is as follows:

[0051] (1) Determine the location of the tumor through CT or MRI;

[0052] (2) Establish a plan for the location, direction, and depth of needle insertion;

[0053] (3) inserting the puncture needle into the intended target using mechanical or manual methods according to the plan in step (2);

[0054] (4) moving the beam needle along the trocar 1 into the patient's body;

[0055] (5) The electron beam is emitted and enters the tumor target area through the beam needle and puncture needle to implement radiotherapy.

[0056] The present invention adopts a double needle setting, the cannula needle 1 is used for radiotherapy to avoid contamination, and the hollow needle 2 is used for "blood return", which is convenient for observing the situation during the puncture process. The doctor can judge whether the puncture needle has penetrated the organs and blood vessels based on whether "blood return" occurs and the color and flow of the blood, thereby improving the safety of the patient's treatment process; the front end 4 of the puncture needle adopts a bevel setting, and the puncture resistance is smaller; the present invention is easy to operate and easy to promote.

[0057] The "front end" of the present invention refers to the part that first approaches the patient during the needle insertion process.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A puncture needle for radiotherapy, comprising a trocar and a hollow needle, characterized in that: The trocar is a hollow tube with a closed front end, the hollow needle is a needle-like object with two ends connected, the trocar is arranged parallel to the central axis of the hollow needle, and the trocar and the hollow needle are connected into a whole by welding or integral molding.

2. The radiotherapy puncture needle according to claim 1, characterized in that: The inner wall of the hollow needle is connected to the trocar, and a blood return channel is formed between the hollow needle and the trocar.

3. The radiotherapy puncture needle according to claim 2, characterized in that: The front end of the hollow needle is a bevel with an inclination angle of 15°-60°, and the front end of the trocar is a round head or a flat head.

4. The radiotherapy puncture needle according to claim 2, characterized in that: The hollow needle is coaxially arranged with the trocar, and the inner wall of the hollow needle is fixedly connected with the outer wall of the trocar via at least two transverse connecting arms.

5. The radiotherapy puncture needle according to claim 2, characterized in that: The inner wall of the hollow needle is tangent to the outer wall of the trocar, and the tangent points are fixedly connected.

6. The radiotherapy puncture needle according to claim 1, characterized in that: The outer wall of the trocar is connected to the hollow needle, and a blood return channel is formed inside the hollow needle.

7. The radiotherapy puncture needle according to claim 6, characterized in that: The front ends of the hollow needle and the trocar are both beveled, the bevel of the trocar is arranged opposite to the bevel of the hollow needle and intersects at the front end of the puncture needle, the bevel angle of the trocar is 15°-45°, and the bevel angle of the hollow needle is 35°-60°.

8. The radiotherapy puncture needle according to claim 6, characterized in that: The outer wall of the hollow needle is tangent to the outer wall of the trocar, and the tangent points are fixedly connected.

9. The radiotherapy puncture needle according to claim 6, characterized in that: The hollow needle is a circular tube with a section of arc cut off, and the axial section of the hollow needle is connected to the outer wall of the trocar.

10. The radiotherapy puncture needle according to any one of claims 1 to 9, characterized in that: The trocar and the hollow needle are both stainless steel needles and titanium alloy needles.

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