X-ray tracking and positioning device for pelvic radiotherapy

Abstract

The utility model provides an X-ray tracking and positioning device for pelvic cavity radiotherapy, which comprises a catheter, the catheter comprises a catheter body, one end of the catheter body is provided with a three-cavity tube, one end of the catheter body far away from the three-cavity tube is provided with a catheter head, the outer surface of the catheter body close to the catheter head is provided with an air bag, and the air bag is provided with an air outlet. A plurality of gold labels used for X-ray tracking and positioning of pelvic cavity radiotherapy are arranged on the inner wall of the side, close to the air bag and far away from the ureter head, of the ureter body, the interval between every two gold labels is larger than or equal to 20 mm, the interval angle between every two gold labels is larger than or equal to 15 degrees, and the number of the gold labels is larger than or equal to 3; compared with the prior art, the non-invasive urinary catheter has the advantages that the plurality of gold labels are embedded in the urinary catheter, so that the urinary catheter containing the gold labels can be placed in the bladder through a non-invasive means, then the positions of the gold labels are locked through X-rays, accurate irradiation can be conducted, and non-invasive and non-pain effects can be achieved; meanwhile, the fear of a patient to an operative wound is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of X-ray tracking and positioning during tumor radiotherapy, in particular to an X-ray tracking and positioning device for pelvic radiotherapy. Background Art

[0002] In the radiotherapy of pelvic tumors, the image-guided radiotherapy (IGRT) technology has improved the irradiation dose and coverage rate of the target area, while reducing the incidence of side reactions in normal organs such as the surrounding intestines and bladder. Especially the application of the SBRT treatment mode has made the importance of IGRT more and more recognized. Taking the CyberKnife as an example, there are currently 5 image-guided methods for the CyberKnife system: skull (6D-skull) tracking method, vertebral body (x-sight) tracking method, synchrony synchronous breathing tracking mode, fiducial tracking mode, and lung (x-sightlung) tracking mode. At present, only the fiducial tracking method is applicable to pelvic tumors. The conventional method is to implant high-purity medical gold into the patient's body through external means using ultrasound guidance technology as a tracking marker. Its advantages are good stability, tissue-related fusion, low complication rate, accurate range, and ensuring the smooth progress of treatment. Its main disadvantage lies in the invasiveness. This fiducial implantation may bring complications such as bleeding, infection, and pain to the patient, reducing the willingness of doctors and patients to use it. Summary of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide an X-ray tracking and positioning device for pelvic radiotherapy, which is used to solve the problem that after implanting fiducials in the prior art, it may bring complications such as bleeding, infection, and pain to the patient, reducing the willingness of doctors and patients to use it.

[0004] To achieve the above purpose and other related purposes, the present utility model provides the following technical solutions:

[0005] An X-ray tracking and positioning device for pelvic radiotherapy, including a urinary catheter. The urinary catheter includes a catheter body. One end of the catheter body is provided with a triple-lumen tube, and the end of the catheter body away from the triple-lumen tube is provided with a catheter head. An airbag is provided on the outer surface of the catheter body near the catheter head. A plurality of fiducials for X-ray tracking and positioning of pelvic radiotherapy are provided on the inner wall of the catheter body near the side of the airbag away from the catheter head. Among them, the interval between each fiducial is ≥ 20 mm, the interval angle between the placements of each fiducial is ≥ 15°, and the number of fiducials is ≥ 3.

[0006] The above technical solution embeds the fiducials on the inner wall of the urinary catheter, then places the urinary catheter containing the fiducials into the bladder through a non-invasive means, and then locks the position of the fiducials with X-rays, so as to be able to perform precise irradiation.

[0007] In an embodiment of the present utility model, scale lines are provided on the outer surface of the tube body between the gold markers and the triple-lumen tube. The scale lines are evenly spaced along the length direction of the tube body on the outer surface of the tube body. After the urinary catheter containing the gold markers is inserted into the bladder, through the scale lines on the urinary catheter, medical staff can conveniently observe whether the insertion length of the urinary catheter has changed and whether the urinary catheter has shifted.

[0008] In an embodiment of the present utility model, a first positioning line is provided on the front surface of the tube body between the scale lines and the triple-lumen tube, and second positioning lines are provided on both side surfaces of the tube body on both sides of the first positioning line. After the urinary catheter containing the gold markers is inserted into the bladder, through the first positioning line and the second positioning lines, medical staff can conveniently observe whether the urinary catheter has rotated.

[0009] In an embodiment of the present utility model, the triple-lumen tube includes a water injection tube and a medicine injection tube connected to the tube body. A water injection hard valve is sleeved on the outer surface of the water injection tube. A water injection port is provided at the end of the water injection tube away from the tube body. A medicine injection port is provided at the end of the medicine injection tube away from the tube body. A urinary catheter plug is provided on the medicine injection port.

[0010] In an embodiment of the present utility model, the triple-lumen tube further includes a liquid outlet tube connected to the tube body and located between the water injection tube and the medicine injection tube. A liquid outlet is provided at the end of the liquid outlet tube away from the tube body.

[0011] As described above, a kind of X-ray tracking and positioning device for pelvic radiotherapy of the present utility model has the following beneficial effects:

[0012] By inlaying multiple gold markers in the urinary catheter, the present utility model can insert the urinary catheter containing the gold markers into the bladder by non-invasive means, and then lock the position of the gold markers with X-rays, so as to perform precise irradiation. Therefore, the present utility model can not only follow the irradiation principle of the gold markers, but also achieve non-invasiveness and painlessness, while reducing the fear of surgical trauma of patients and improving patient satisfaction. In addition, the present utility model can also control the filling of the bladder while indicating the position of the tumor, further improving the dose projection accuracy. Moreover, the whole operation is non-invasive, and medical staff can use it without additional training, improving the willingness of medical staff and patients to use. Description of the Drawings

[0013] Figure 1 It is the overall schematic diagram of the X-ray tracking and positioning device for pelvic radiotherapy disclosed in the embodiment of the present utility model;

[0014] Figure 2Anatomical schematic diagram of inserting a urinary catheter into the bladder in the X-ray tracking and positioning device for pelvic radiotherapy disclosed in the embodiments of the present utility model.

[0015] Element label description

[0016] 1. Urinary catheter; 2. Tube body; 3. Triple-lumen tube; 301. Water injection tube; 302. Water injection hard valve; 303. Water injection port; 304. Liquid outlet tube; 305. Liquid outlet; 306. Medicine injection tube; 307. Urinary catheter plug; 4. Urinary catheter head; 5. Airbag; 6. Gold marker; 7. Scale line; 8. First positioning line; 9. Second positioning line. Specific implementation manner

[0017] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0018] Please refer to Figure 1 and Figure 2 , the present utility model provides an X-ray tracking and positioning device for pelvic radiotherapy, which is used for non-invasive tracking of the tumor position during radiotherapy for various pelvic tumors, improves the accuracy of radiotherapy, reduces the damage of radiotherapy to other normal tissues, and is non-invasive to patients at the same time, reducing the pain of patients. It includes a urinary catheter 1. Among them, the urinary catheter 1 is a triple-lumen double-balloon urinary catheter, including various specifications of 8-24Fr, suitable for children and adults. Generally, children choose 6, 8, and 10Fr, and adults generally choose 16, 18, 20, and 22Fr. Patients with a history of prostate hyperplasia in men can use 14Fr. The urinary catheter 1 includes a tube body 2. One end of the tube body 2 is provided with a triple-lumen tube 3, and the other end of the tube body 2 far from the triple-lumen tube 3 is provided with a urinary catheter head 4. An airbag 5 is provided on the outer surface of the tube body 2 close to the urinary catheter head 4. A plurality of gold markers 6 for X-ray tracking and positioning of pelvic radiotherapy are provided on the inner wall of the tube body 2 on the side close to the airbag 5 and far from the urinary catheter head 4. Among them, the interval between each gold marker 6 ≥ 20mm, the interval angle between the placements of each gold marker 6 ≥ 15°, and the number of gold markers 6 ≥ 3;

[0019] The material of the gold markers 6 is medical-grade gold. Each gold marker 6 has a length range of approximately 5 mm and a diameter of approximately 1 mm. Multiple gold markers 6 are inlaid with medical-grade gold material at intervals of 20 mm at a position 10 mm below the distal balloon 5. Each gold marker 6 is placed in a spiral manner. In the presence of the physiological curvature, the interval angle between the gold markers 6 is ensured to be greater than 15 degrees to ensure that the gold markers 6 are not on the same plane. The position where the gold markers 6 are inlaid needs to be marked with a scale. The position of the gold markers 6 in the tube body 2 is fixed and cannot move. By inlaying the gold markers 6 on the inner wall of the urinary catheter 1, and then placing the urinary catheter 1 containing the gold markers 6 into the bladder through a non-invasive method, and then using X-rays to lock the position of the gold markers 6, accurate irradiation can be carried out.

[0020] Scale lines 7 are provided on the outer surface of the tube body 2 between the gold markers 6 and the triple-lumen tube 3. The scale lines 7 are evenly spaced along the length direction of the tube body 2 on the outer surface of the tube body 2. Among them, the length of the scale lines 7 is 30 cm (because the male urethra is generally 18 cm and the female urethra is 5 cm). A first positioning line 8 is provided on the front surface of the tube body 2 between the scale lines 7 and the triple-lumen tube 3. Second positioning lines 9 are provided on both sides of the first positioning line 8 on both side surfaces of the tube body 2. Among them, the first positioning line 8 is black in actual application, and the second positioning line 9 is red in actual application. After the urinary catheter 1 containing the gold markers 6 is placed into the bladder, through the scale lines 7 on the urinary catheter 1, it is convenient for medical staff to observe whether the inserted length of the urinary catheter 1 has changed and whether the urinary catheter 1 has shifted. Through the first positioning line 8 and the second positioning line 9, it is convenient for medical staff to observe whether the urinary catheter 1 has rotated.

[0021] The triple-lumen tube 3 includes a water injection tube 301 and a medicine injection tube 306 connected to the tube body 2. A water injection hard valve 302 is sleeved on the outer surface of the water injection tube 301. A water injection port 303 is provided at the end of the water injection tube 301 far from the tube body 2. A medicine injection port is provided at the end of the medicine injection tube 306 far from the tube body 2, and a urinary catheter plug 307 is provided on the medicine injection port. The triple-lumen tube 3 further includes a liquid outlet tube 304 connected to the tube body 2 and located between the water injection tube 301 and the medicine injection tube 306. A liquid outlet 305 is provided at the end of the liquid outlet tube 304 far from the tube body 2. Among them, before each irradiation, urine is discharged first to make the bladder empty, and then 100 ml of normal saline is injected through the water injection port 303 to make the bladder have a certain degree of filling. According to the literature, when the bladder is under-filled, the actual radiation dose received by the patient is higher than the planned dose, and there is no significant difference when the bladder filling volume is between 50 ml and 300 ml.

[0022] Specifically, please refer to Figure 1 and Figure 2, the usage method of this tracking and positioning device is as follows: The first step: Before pelvic radiotherapy, the patient is fully evaluated, including the tumor location, the patient's urinary system condition, etc.; The second step: Select a suitable catheter model according to the degree of urethral relaxation of the patient, so as to improve the fixing accuracy of the catheter 1 and the comfort of the patient; The third step: The medical staff place the catheter 1 according to the procedure, adjust the direction and angle of the catheter 1 for proper fixation; The fourth step: Apply color Doppler and CT to scan whether the position of the gold marker 6 is effective, ensure that the gold marker 6 is in different planes under the plain film, and the tracking can be smoothly executed; The fifth step: Fix it by the high-lifting platform method on the inner thigh. The main method is to use an elastic bandage to wind around the inner thigh at a distance of 10 cm from the thigh root by the high-lifting platform method to reinforce the catheter 1 and prevent it from moving; The sixth step: Record the scale at the time of fixation for easy reset during each treatment. Taking the CyberKnife as an example, the CyberKnife generally treats about 5 times in each treatment course. Before each treatment, check whether the gold marker 6 is displaced through the marking line and scale of the catheter 1 and color Doppler examination. Then, after emptying the bladder, inject 500 ml of normal saline into the water injection port 303 of the catheter 1 to ensure the same bladder fullness degree during each treatment; The seventh step: After confirmation, start radiotherapy. After the end of the whole treatment course, remove the catheter 1.

[0023] In summary, the present utility model places the catheter 1 containing the gold marker 6 into the bladder by a non-invasive means, which is convenient to operate. At the same time, it reduces the risk of infection and bleeding caused by invasive operations, and uses the gold marker 6 tracking technology to improve the accuracy of pelvic radiotherapy; moreover, the catheter 1 containing the gold marker 6 is small and easy to fix, not easy to shift, and improves the accuracy of dose irradiation; it can also accurately control the total amount of liquid contained in the bladder through bladder perfusion to prevent the bladder from being empty, the rays from damaging the tissues around the tumor, and can also avoid treatment deviation caused by different bladder volumes each time.

[0024] Furthermore, first of all, the traditional gold marker 6 tracking method is an invasive operation, which may cause risks such as tumor rupture and bleeding, infection, etc. during the operation, and there are also cases of puncture failure; while the present utility model places the gold marker 6 at the prostate site through the catheter 1 by a non-invasive means, and then fixes the catheter 1 through the airbag 5 and elastic tape, etc., so that it does not rotate or shift; at the same time, observe the scale line 7 and the red and black positioning line before each treatment to ensure whether the gold marker 6 is displaced; secondly, the position of the gold marker 6 and the tumor can be confirmed by color Doppler ultrasound before each CyberKnife treatment. The operation is convenient and simple. The traditional gold marker 6 tracking method directly implants the gold marker 6 into the tumor site through a thin needle. When the implantation angle is not ideal or the gold marker 6 is displaced, it cannot be adjusted and can only be discarded directly. However, the present utility model can be properly fixed by adjusting the direction and angle of the catheter 1 to ensure the effectiveness of the position of the gold marker 6 and improve the irradiation accuracy.

[0025] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. All equivalent modifications or changes made by those of ordinary skill in the art without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. An X-ray tracking and positioning device for pelvic radiotherapy, comprising a urinary catheter (1), the urinary catheter (1) including a catheter body (2), one end of the catheter body (2) being provided with a triple-lumen tube (3), the end of the catheter body (2) away from the triple-lumen tube (3) being provided with a urinary catheter tip (4), and an airbag (5) being provided on the outer surface of the catheter body (2) near the urinary catheter tip (4), characterized in that: On the inner wall of the tube body (2) near the side away from the urinary catheter head (4) of the airbag (5), several gold markers (6) for X-ray tracking and positioning in pelvic radiotherapy are provided. Among them, the interval between each of the gold markers (6) is ≥ 20 mm, the interval angle between the placements of each of the gold markers (6) is ≥ 15°, and the number of the gold markers (6) is ≥ 3.

2. The X-ray tracking and positioning device for pelvic radiotherapy according to claim 1, wherein: On the outer surface of the tube body (2), there are scale lines (7) located between the gold markers (6) and the triple-lumen tube (3). The scale lines (7) are evenly arranged at intervals along the length direction of the tube body (2) on the outer surface of the tube body (2).

3. The X-ray tracking and positioning device for pelvic radiotherapy according to claim 2, wherein: On the front surface of the tube body (2), there is a first positioning line (8) located between the scale lines (7) and the triple-lumen tube (3). On both sides of the first positioning line (8), there are second positioning lines (9) arranged on both side surfaces of the tube body (2).

4. The X-ray tracking and positioning device for pelvic radiotherapy according to claim 1, wherein: The triple-lumen tube (3) includes a water injection tube (301) and a medicine injection tube (306) connected to the tube body (2). A water injection hard valve (302) is sleeved on the outer surface of the water injection tube (301). At the end of the water injection tube (301) away from the tube body (2), there is a water injection port (303). At the end of the medicine injection tube (306) away from the tube body (2), there is a medicine injection port, and a urinary catheter plug (307) is provided on the medicine injection port.

5. The X-ray tracking and positioning device for pelvic radiotherapy according to claim 4, wherein: The triple-lumen tube (3) further includes a liquid outlet tube (304) connected to the tube body (2) and located between the water injection tube (301) and the medicine injection tube (306). At the end of the liquid outlet tube (304) away from the tube body (2), there is a liquid outlet (305).

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