Adjustable mold fixing device for implanting between three-dimensional intracavitary tissues

Abstract

The invention relates to the technical field of medical instruments, in particular to an adjustable three-dimensional intracavitary tissue implantation mold fixing device which comprises a rod body, an insertion head and a fixing block, the inner end of the rod body is connected with the middle of the outer end of the insertion head, and the outer end of the rod body is connected with the middle of the inner end of the fixing block. The outer end of the insertion head is a plane end connected with the inner end of the rod body; a first fixing block insertion hole is formed in the surface of the fixing block; a rod body insertion hole and a first insertion head insertion hole which are communicated with the first fixing block insertion hole are respectively formed in the outer edge of the end part of the rod body and the insertion head; the rod body comprises a sleeve rod and a telescopic rod, and the inner diameter of the sleeve rod is equal to the outer diameter of the telescopic rod. The length of the rod body can be adjusted, so that the source applicator fixing device can be adjusted to the optimal length according to the length of the vagina of a patient, and the problem that the rod body is prone to falling off in the operation process or the rod body is too short and cannot make full contact with the cervical focus is solved.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to an adjustable three-dimensional intracavitary intertissue implantation mold fixing device. Background Art

[0002] Cervical cancer and endometrial cancer are two common malignant tumors of the female reproductive system, which seriously endanger women's health. Radiotherapy is an important means of treating cervical cancer. About 80% of confirmed patients need to receive radiotherapy, and intracavitary afterloading radiotherapy is the standard treatment mode for patients with positive postoperative margins, locally advanced and recurrent disease. "Intracavitary afterloading radiotherapy" is also called "brachytherapy", which is a way of radiotherapy in which the radiation source is placed in the tumor area through an applicator or directly implanted into the tumor tissue. Compared with traditional two-dimensional afterloading, three-dimensional afterloading therapy can adjust the dose distribution according to the morphology, location and distance between the tumor and the surrounding normal tissue to achieve good target coverage. In three-dimensional brachytherapy, the traditional manual implantation technology has high requirements for the operator and low repeatability, resulting in unsatisfactory dose distribution, which seriously affects the patient's prognosis. Therefore, we need to design a mold fixing device that can be used for most patients, reduce the difficulty of operation, improve the repeatability of source distribution, and obtain the optimal dose distribution in order to reduce the recurrence rate of patients. Although some units have explored the feasibility of molds, it is found in actual clinical practice that most universal molds still have disadvantages when used. The most common problem is that most molds are fixed in length and cannot be adjusted according to the actual length of the patient's vagina. For example, for patients who have had part of their vagina removed after surgery, the mold is too long, most of the molds fall out of the vagina, and it is difficult to fix them. It is also impossible to ensure that they will not move during the implementation of the plan, resulting in missed targets or increased unwarranted irradiation of normal tissues. For patients with long vaginas, the mold is not long enough to reach the target lesion, resulting in missed irradiation and increased radiation damage to the vaginal wall. Therefore, we need to explore a mold that can be adjusted according to the length of the patient's vagina to achieve perfect dose coverage while greatly reducing adverse reactions to surrounding normal tissues.

[0003] Based on the above problems, the present invention proposes a three-dimensional intracavitary post-loading interstitial implant source applicator mold fixing device. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an adjustable three-dimensional intracavitary tissue insertion mold fixing device. The semi-ellipsoidal structure of the outer end of the insertion head can play a guiding role, so that the entire fixing device is convenient for insertion into the patient's vagina. By arranging the first fixing block insertion holes in a ring array on the surface of the fixing block, the end of the rod body and the insertion head, the lesion is covered according to the shape and size of the tumor with the assistance of CT or MR imaging technology, and then connected to the afterloading treatment machine through the applicator. The afterloading treatment machine can accurately deliver the radiation source to the location of the tumor through the applicator; the telescopic rod slides along the inner wall of the sleeve rod to adjust the length of the rod body, so that the insertion applicator fixing device can be adjusted to a suitable length according to the length of the patient's vagina, avoiding the problem that the rod body is too long and easy to fall off during the operation and the rod body is too short to fully fit the cervix.

[0005] In order to achieve the purpose of the present invention, the technical solution adopted by the present invention is: The present invention discloses a source fixing device for three-dimensional intracavitary post-loading treatment of interstitial tissue insertion, comprising a rod body, an insertion head and a fixing block, wherein the inner end of the rod body is connected to the middle part of the outer end of the insertion head, and the outer end of the rod body is connected to the middle part of the inner end of the fixing block, and the insertion head is in a semi-ellipsoidal structure, and its outer end is a plane end connected to the inner end of the rod body; the fixing block, the rod body and the insertion head are axially provided with holes for cervical canal insertion; the surface of the fixing block is in an annular array with a first fixing block insertion hole, and the outer edge of the end of the rod body and the insertion head are respectively provided with a rod body insertion hole and a first insertion head insertion hole which are connected to the first fixing block insertion hole; the rod body comprises a sleeve rod and a telescopic rod, the inner diameter of the sleeve rod is equal to the outer diameter of the telescopic rod, and the rod body insertion hole is arranged at the outer edge of the end face of the sleeve rod.

[0006] The inner wall of the sleeve rod is provided with a slide groove along its length direction at the left front and right rear, and the outer end of the slide groove is provided with a closed end; the outer wall of the telescopic rod is provided with a slider that slides in cooperation with the slide groove at the left front inner end and the right rear inner end; the slide groove is arranged between the two rod body insertion holes.

[0007] A plurality of connecting holes are provided at equal intervals along the length direction of the sleeve rod at the right front and left rear of the inner wall, and a quick connecting mechanism matching and engaging with the connecting holes is provided at the inner ends at the right front and left rear of the outer wall of the telescopic rod. The quick connecting mechanism includes a limiting groove, a limiting block and a compression spring. The limiting groove is provided at the inner ends at the right front and left rear of the outer wall of the telescopic rod, the inner side of the limiting block is cylindrical and slides with the limiting groove, and the outer side of the limiting block is a hemispherical structure that can match and engage with the connecting hole; and a plurality of the compression springs are connected between the inner end surface of the limiting block and the inner wall of the limiting groove.

[0008] The fixing block is a square structure with arc-shaped ends. A second fixing block insertion hole and a third fixing block insertion hole in a square shape are respectively provided on both sides in the length direction and the width direction of the fixing block.

[0009] The fixing block is made of rubber material.

[0010] A plurality of second insertion head implantation holes and third insertion head implantation holes are evenly distributed at both ends in the length direction and the width direction of the insertion head.

[0011] The second insertion head implantation hole and the third insertion head implantation hole on the outside form an annular structure arranged on the outer edge of the insertion head.

[0012] The beneficial effects of the present invention are: (1) The semi-ellipsoidal structure of the outer end of the insertion head of the present invention can play a guiding role, so that the entire fixing device is easy to insert into the patient's vagina. By arranging the first fixing block insertion holes in a ring array on the surface of the fixing block, the end of the rod body and the insertion head, the source applicator can be passed through at a suitable position according to the shape and size of the tumor, so that the source applicator can completely cover the tumor target area, and then connected to the afterloader through the source applicator. The afterloader can accurately deliver the radiation source to the location of the tumor through the source applicator; the telescopic rod can slide along the inner wall of the sleeve rod to adjust the length of the rod body, so that the insertion applicator fixing device can be adjusted to a suitable length according to the length of the patient's vagina, avoiding the problem of the rod body being too long and easy to fall off during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 A bottom view of the present invention; Figure 3 for Figure 2 The cross section along AA in the figure; Figure 4 for Figure 3 A partial enlarged view of Figure 5 It is a partial structural schematic diagram of the present invention; Figure 6 This is a usage state diagram of the present invention.

[0014] In the figure: 1 rod body, 2 insertion head, 3 fixed block, 4 cervical canal, 5 cervical hole, 6 rod body implantation hole, 7 quick connection mechanism, 8 source applicator, 11 sleeve rod, 12 telescopic rod, 13 slide groove, 14 slider, 15 connection hole, 21 first insertion head implantation hole, 22 second insertion head implantation hole, 23 third insertion head implantation hole, 31 first fixed block implantation hole, 32 second fixed block implantation hole, 33 third fixed block implantation hole, 71 limit groove, 72 limit block, 73 compression spring. DETAILED DESCRIPTION

[0015] The present invention is further described below: See also Figure 1-6 , The present invention discloses an adjustable three-dimensional intracavitary tissue intercalation mold fixing device, comprising a rod body 1, an insertion head 2 and a fixing block 3, wherein the inner end of the rod body 1 is connected to the middle part of the outer end of the insertion head 2, and the outer end of the rod body 1 is connected to the middle part of the inner end of the fixing block 3, and the insertion head 2 is a semi-ellipsoidal structure, and its outer end is a plane end connected to the inner end of the rod body 1; the fixing block 3, the rod body 1 and the insertion head 2 are axially provided with a cervical hole 5 for inserting a cervical canal 4; the surface of the fixing block 3 is annularly arrayed with a first fixing block insertion hole 31, and the outer edge of the end of the rod body 1 and the insertion head 2 are respectively provided with a rod body insertion hole 6 and a first insertion head insertion hole 21 connected to the first fixing block insertion hole 31; the rod body 1 comprises a sleeve rod 11 and a telescopic rod 12, the inner diameter of the sleeve rod 11 is equal to the outer diameter of the telescopic rod 12, and the rod body insertion hole 6 is connected to the outer diameter of the telescopic rod 12. The implantation hole 6 is arranged at the outer edge of the end surface of the sleeve rod 11. The semi-ellipsoidal structure of the outer end of the insertion head 2 can play a guiding role, so that the entire fixing device is convenient for insertion into the patient's vagina. By arranging the first fixing block implantation holes 31 in a ring array on the surface of the fixing block 3, the end of the rod body 1 and the insertion head, the applicator 8 can be passed through at a suitable position according to the shape and size of the tumor, so that the applicator can completely cover the tumor target area, and then connected to the afterloading treatment machine through the applicator 8. The afterloading treatment machine can accurately deliver the radiation source to the location of the tumor through the applicator 8 and the cervical canal 4; the telescopic rod 12 slides along the inner wall of the sleeve rod 11 to adjust the length of the rod body 1, so that the implantation mold fixing device can adjust the appropriate length according to the length of the patient's vagina, avoiding the problem of the rod body 1 being too long and easy to fall off during the operation.

[0016] Furthermore, a slide groove 13 is provided at the left front and right rear of the inner wall of the sleeve rod 11 along its length direction, and the outer end of the slide groove 13 is provided with a closed end; a slider 14 that slides with the slide groove 13 is provided at the left front inner end and the right rear inner end of the outer wall of the telescopic rod 12; the slide groove 13 is provided between the two rod body planting holes 6, and by providing the slide groove 13 on the inner wall of the sleeve rod 11 and the slider 14 that slides with it on the outer wall of the telescopic rod 12, it can be ensured that the telescopic rod 12 will not rotate in the sleeve rod 11, ensuring fixation. The first fixed block planting hole 31 on the surface of the block 3 can be coaxial with the outer edge of the end of the sleeve rod 11 and the rod body planting hole 6 and the first insertion head planting hole 21 on the insertion head 2, so that the source applicator 8 can pass smoothly; by setting a closed end at the outer end of the slide groove 13, it is ensured that when adjusting the length of the rod body 1, the sleeve rod 11 and the telescopic rod 12 will not accidentally disengage; during production, the outer end of the telescopic rod 12 is first passed through the inner end of the sleeve rod 11, and then the inner end of the sleeve rod 11 is connected to the insertion head 2, and the outer end of the telescopic rod 12 is fixedly connected to the fixed block 3.

[0017] Furthermore, a plurality of connecting holes 15 are provided at equal intervals along the length direction of the sleeve rod 11 at the right front and left rear of the inner wall, and a quick connecting mechanism 7 that matches and engages with the connecting hole 15 is provided at the inner end at the right front and left rear of the outer wall of the telescopic rod 12. The quick connecting mechanism 7 includes a limiting groove 71, a limiting block 72 and a compression spring 73. The limiting groove 71 is provided at the inner end at the right front and left rear of the outer wall of the telescopic rod 12. The inner side of the limiting block 72 is cylindrical and slides with the limiting groove 71. The outer side of the limiting block 72 is a hemispherical structure that can match and engage with the connecting hole 15. The inner end surface of the limiting block 72 is connected to the inner wall of the limiting groove 71 by a plurality of the compression springs 73. When the telescopic rod 12 When moving along the inner wall of the sleeve rod 11, the limit block 72 is compressed by the inner wall of the sleeve rod 11 and retracted into the limit groove 71. At this time, the compression spring 73 is in a compressed state; when the limit block 72 moves to the position of the connecting hole 15, due to the reset effect of the compression spring 73, the hemispherical outer end of the limit block 72 extends outward and is inserted into the connecting hole 15 to complete the engagement. When this connecting hole 15 is not a connecting hole 15 in a suitable fixed position, the user can pull the telescopic rod 12 outward, and the pulling force acts on the hemispherical surface of the limit block 72, thereby generating a partial force that presses the limit block 72 into the limit groove 71, causing the limit block 72 to retract into the limit groove 71. This is repeated until the quick connection mechanism 7 is engaged with the connecting hole 15 in a suitable position to complete the adjustment of the length of the telescopic rod 12.

[0018] Furthermore, the fixed block 3 is a square structure with arc-shaped ends, and the fixed block 3 is respectively provided with a square second fixed block implantation hole 32 and a third fixed block implantation hole 33 on both sides of the length direction and the width direction, and a plurality of second insertion head implantation holes 22 and third insertion head implantation holes 23 are evenly distributed at both ends of the length direction and the width direction of the insertion head 2. The source applicator 8 can be inserted through a second fixed block implantation hole 32 and then pass through any second insertion head implantation hole 22 or inserted through a third fixed block implantation hole 23 and then pass through any third insertion head implantation hole 23 according to the location and dosage requirements of the tumor.

[0019] Furthermore, the fixing block 3 is made of rubber material, so that the source applicator 8 can more easily change direction and pass through the second insertion head implantation hole 22 or the third insertion head implantation hole 23 at a suitable position.

[0020] Furthermore, the second insertion head implantation hole 22 and the third insertion head implantation hole 23 on the outside form an annular structure arranged on the outer edge of the insertion head 2.

[0021] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings or directly or indirectly applied in related technical fields are also included in the patent protection scope of the present invention.

Claims

1. An adjustable three-dimensional intracavitary intertissue implantation mold fixing device, characterized in that: It comprises a rod body (1), an insertion head (2) and a fixing block (3), wherein the inner end of the rod body (1) is connected to the middle part of the outer end of the insertion head (2), the outer end of the rod body (1) is connected to the middle part of the inner end of the fixing block (3), and the insertion head (2) is a semi-ellipsoidal structure, and its outer end is a planar end connected to the inner end of the rod body (1); The fixing block (3), the rod body (1) and the insertion head (2) are provided with a cervical hole (5) for inserting the cervical canal (4) in the axial direction; the surface of the fixing block (3) is provided with a first fixing block insertion hole (31) in an annular array; the outer edge of the end of the rod body (1) and the insertion head (2) are respectively provided with a rod body insertion hole (6) and a first insertion head insertion hole (21) which are connected to the first fixing block insertion hole (31); the rod body (1) comprises a sleeve rod (11) and a telescopic rod (12); the inner diameter of the sleeve rod (11) is equal to the outer diameter of the telescopic rod (12); and the rod body insertion hole (6) is arranged at the outer edge of the end surface of the sleeve rod (11).

2. The adjustable three-dimensional intracavitary interstitial implant mold fixing device according to claim 1 is characterized in that: The inner wall of the sleeve rod (11) is provided with a slide groove (13) along its length direction at the left front and right rear ends, and the outer end of the slide groove (13) is provided with a closed end; the outer wall of the telescopic rod (12) is provided with a sliding block (14) that slides in cooperation with the slide groove (13) at the left front inner end and the right rear inner end; the slide groove (13) is arranged between the two rod body insertion holes (6).

3. The adjustable three-dimensional intracavitary interstitial implant mold fixing device according to claim 2 is characterized in that: A plurality of connection holes (15) are provided at equal intervals along the length direction of the sleeve rod (11) at the right front and left rear of the inner wall; a quick connection mechanism (7) is provided at the inner end at the right front and left rear of the outer wall of the telescopic rod (12) to match and engage with the connection holes (15); the quick connection mechanism (7) comprises a limit groove (71), a limit block (72) and a compression spring (73); the limit groove (71) is provided at the inner end at the right front and left rear of the outer wall of the telescopic rod (12); the inner side of the limit block (72) is cylindrical and slides with the limit groove (71); the outer side of the limit block (72) is hemispherical and can match and engage with the connection hole (15); and a plurality of the compression springs (73) are connected between the inner end surface of the limit block (72) and the inner wall of the limit groove (71).

4. The adjustable three-dimensional intracavitary interstitial implant mold fixing device according to claim 3 is characterized in that: The fixing block (3) is a square structure with arc-shaped ends, and a second fixing block insertion hole (32) and a third fixing block insertion hole (33) in the shape of a square are respectively provided on both sides in the length direction and the width direction of the fixing block (3).

5. The adjustable three-dimensional intracavitary interstitial implant mold fixing device according to claim 4 is characterized in that: The fixing block (3) is made of rubber material.

6. The adjustable three-dimensional intracavitary interstitial implant mold fixing device according to claim 5, characterized in that: A plurality of second insertion head implantation holes (22) and third insertion head implantation holes (23) are evenly distributed at both ends of the insertion head (2) in the length direction and both ends in the width direction.

7. The adjustable three-dimensional intracavitary interstitial implant mold fixing device according to claim 6, characterized in that: The second insertion head implantation hole (22) and the third insertion head implantation hole (23) on the outside form an annular structure arranged on the outer edge of the insertion head (2).

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