Ovate body with implantation function

Abstract

The utility model relates to medical instrument technical field, concretely is a kind of ovate with implanting function, multiple groups of implanting passageway are provided on the ovate, implanting passageway is used to insert implanting steel needle, and the aperture of implanting passageway is greater than the diameter of implanting steel needle;The inner wall of each implanting passageway is also provided with the elastic limiting piece of hollow structure, and the elastic limiting piece is connected with implanting steel needle expansion tightly.The utility model can fix implanting steel needle by setting elastic limiting piece on the inner wall of implanting passageway, avoid implanting steel needle from implanting passageway and slip after inserting implanting passageway, because channel inner diameter is larger, implanting steel needle slips from implanting passageway;And elastic limiting piece has certain elastic deformation space, and can adaptively deform with the direction of steel needle fine adjustment, to realize the direction of implanting steel needle can be fine adjusted according to tumour position after insertion, improve positioning accuracy.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an oval body with implantation function. Background Technology

[0002] Brachytherapy is an important technique in gynecological tumor radiotherapy. By inserting a radioactive applicator into the body and using interstitial implantation techniques, it can achieve high-dose, precise irradiation of the tumor area while reducing damage to surrounding normal tissues. This technique has significant advantages in the treatment of diseases such as cervical cancer and vaginal stump cancer, and is especially suitable for dose optimization of large tumors or eccentric lesions.

[0003] Existing technology CN219721678U discloses an applicator for an oval body with implantation function. This applicator features an implantation channel on the oval body for inserting and passing a soft needle, with the diameter of the channel matching the diameter of the soft needle. Compared to traditional oval bodies without implantation holes, this applicator significantly expands the implantation range, making it better suited for large masses and eccentric complex masses. Furthermore, the implantation channel on the oval body provides guidance, reducing positioning errors caused by traditional manual manipulation. However, this technology still presents the following technical problems in clinical use:

[0004] 1. The implantation needle is a soft needle, which makes precise fine-tuning difficult: Because the soft needle is easy to bend and deform, it is difficult to maintain a fixed direction during fine-tuning and is prone to unexpected deviation due to external forces (such as tissue resistance); especially in tortuous or narrow cavities (such as parauterine infiltrating lesions), it is easy to bend or deviate from the path, and the problem of "over-adjustment" or "under-adjustment" may occur during fine-tuning; in addition, after multiple fine-tuning, the soft needle may undergo plastic deformation, which will further reduce the positioning accuracy.

[0005] 2. A perfect match between the implantation needle and the implantation channel limits the fine-tuning space of the needle within the channel, causing a certain degree of deviation after the needle exits the channel. This deviation cannot be corrected through fine-tuning during the implantation process; the doctor must rely on experience to determine whether to re-implant the needle after it exits the channel, increasing the complexity of the procedure and the risk of tissue damage. On the other hand, if a gap is left in the implantation channel, the needle is prone to shaking, leading to positioning deviation. Utility Model Content

[0006] This invention provides an oval body with an implantation function, which can solve the technical problem that it is difficult to achieve precise fine-tuning after the existing implantation needle is fully matched with the implantation channel on the oval body.

[0007] This application provides the following technical solution:

[0008] An oval body with an implantation function is provided, wherein the oval body is provided with multiple sets of implantation channels for inserting implantation steel needles, and the diameter of the implantation channel is larger than the diameter of the implantation steel needle; each implantation channel is also provided with a hollow elastic limiting member on its inner wall, and the elastic limiting member is connected to the implantation steel needle with tension.

[0009] Beneficial effects:

[0010] 1. Balancing fixation and flexibility through the coordinated design of aperture and elastic limiting components: By setting elastic limiting components on the inner wall of the insertion channel, the insertion needle can be fixed, preventing the insertion needle from slipping out of the insertion channel due to its large inner diameter. The elastic limiting components have a certain elastic deformation space, which can adapt to the slight adjustment of the needle's direction after insertion, thereby enabling the needle's direction to be slightly adjusted according to the tumor location after insertion, improving positioning accuracy.

[0011] 2. Improve the repeatability and dosage consistency of fractionated treatment: The elastic design of the elastic limiter ensures that the steel needle can be reset to the initial reference position with the same tension force each time it is inserted, avoiding positional deviations between fractions caused by material fatigue of the soft needle or differences in the doctor's operating force; combined with image guidance (such as CT / MRI), the steel needle can be quickly calibrated to the position consistent with the treatment plan before each treatment by fine adjustment, ensuring the consistency of radiation source positioning in multiple radiotherapy sessions, thereby improving the accuracy of tumor target area dose coverage and avoiding the decline in efficacy due to the accumulation of fractionation errors.

[0012] Furthermore, the elastic limiting elements in the insertion channels near or away from the oval hemiplane are distributed on the inner wall of the entire insertion channel, while the elastic limiting elements in the remaining insertion channels are not completely distributed on the inner wall of the insertion channel.

[0013] Beneficial effects:

[0014] 1. The insertion channel near the oval body hemiplane is closer to the central area of ​​the cervical tumor and can usually be directly aligned with the main lesion. The insertion path is relatively straight and requires less fine-tuning. By distributing the elastic limiting elements completely on the inner wall of the entire insertion channel, a uniform clamping force can be formed in the entire circumference, enhancing the initial positioning accuracy. In addition, for this type of main lesion with a relatively clear location, frequent fine-tuning is not required. The completely fixed elastic limiting elements can allow the steel needle to be quickly positioned, shortening the operation time.

[0015] 2. Since the part of the oval body away from the semi-plane is spherical, the curvature of the spherical surface shortens the path of the insertion channel, and the exposed part of the steel needle is relatively long after insertion. If the fixation is insufficient, it is easy to swing. By fully distributing the elastic limiting elements in the insertion channel, the stability of the steel needle after insertion can be guaranteed, and the fixation defects of the short channel can be made up for.

[0016] 3. The remaining insertion channels are located between the two and are usually used to target eccentric, invasive or lobulated tumors. Precise needle placement is achieved through multi-angle fine-tuning, so the fine-tuning requirements for the insertion needles are greater. By setting incomplete elastic limiters, a larger fine-tuning range can be provided for the insertion needles, improving the flexibility of dose planning.

[0017] Furthermore, elastic limiting elements, which are not completely distributed on the inner wall of the planting channel, are set at the entrance section of the planting channel.

[0018] Beneficial effects: The concentrated distribution of elastic limiting elements in the entry section (such as covering the first 1 / 3 of the channel length) can form an initial clamping force on the inserted steel needle, avoiding the risk of "slippage". Then, combined with imaging guidance, it can be gradually advanced and fine-tuned, simplifying the "alignment process". The distal end of the channel (near the needle tip exit) does not have limiting elements, so that the steel needle can be dynamically adjusted deep according to the actual lesion location after entering the tissue. For example, for lobulated tumors, the steel needle can be fixed to the first angle through the entry section. After advancing to a certain depth, the distal free section can be used to fine-tune to the second angle, which can improve the treatment efficiency of complex lesions.

[0019] Furthermore, the elastic limiting component is made of TPE material.

[0020] Beneficial effects: TPE material possesses high resilience and wear resistance, and is not prone to plastic deformation during repeated insertion and removal operations. Compared with traditional elastic materials such as silicone, it can significantly extend the service life of the applicator and reduce medical costs. For patients requiring multiple treatments, the stable elasticity of the TPE limiting component ensures consistent needle positioning for each insertion, avoiding the accumulation of errors between treatments due to material fatigue.

[0021] Furthermore, the elastic limiting component and the oval body are integrally formed using 3D printing.

[0022] Furthermore, the diameter of the insertion channel is 2mm, the diameter of the insertion steel needle is 1.5-2mm, and the inner diameter of the elastic limiting member is 1.5mm.

[0023] Furthermore, the ovoid comprises a semi-cylindrical middle segment and transitional hemispheres located at both ends of the middle segment.

[0024] Beneficial effects: The oval body of this structure can closely match the longitudinal anatomical orientation of the vaginal fornix, ensuring stable positioning.

[0025] Furthermore, three sets of insertion channels are provided, namely the first insertion channel, the second insertion channel, and the third insertion channel, which are located from the hemisphere closest to the oval body outwards; the elastic limiting element in the second insertion channel is located in the entrance section of the second insertion channel.

[0026] Furthermore, the angle between the central axis of the insertion channel and the dome tube on the applicator is 15-45°.

[0027] Beneficial effects: The optimal angle is 45°, which can treat lesions far enough away from the uterus. Because the vaginal opening and the size of the oval shape are limited, if the angle is greater than 45°, the steel needle cannot pass through the oval shape from the vaginal opening. If the angle is less than 15°, it can hardly treat tumors in the parametrial area.

[0028] Furthermore, the angle between the central axis of the first insertion channel and the dome tube is 15°, the angle between the second insertion channel and the dome tube is 30°, and the angle between the third insertion channel and the dome tube is 45°. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a three-dimensional model of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of an oval body;

[0031] Figure 3 A schematic diagram showing the insertion of a steel needle into the oval body;

[0032] Figure 4 A schematic diagram showing the insertion of a steel needle into the oval body from another direction. Detailed Implementation

[0033] The following detailed description illustrates the specific implementation method:

[0034] The markings in the accompanying drawings include: oval body 1, mounting groove 10, insertion channel 11, first insertion channel 111, second insertion channel 112, third insertion channel 113, insertion steel needle 2, first insertion steel needle 21, second insertion steel needle 22, third insertion steel needle 23, and elastic limiting member 3.

[0035] Example 1

[0036] An oval-shaped implant with insertion function is used to fix the oval-shaped implant 1 to the front end of the dome tube of the applicator; specifically as follows: Figure 2 As shown, in this embodiment, the oval body 1 includes a semi-cylindrical middle segment and transitional hemispherical segments at both ends of the middle segment. This structure can closely match the longitudinal anatomical orientation of the vaginal fornix, ensuring stable positioning; as shown... Figure 1 As shown, an installation groove 10 is also provided on the oval body 1, and the front end of the dome tube extends into the installation groove 10 and connects to the oval body 1.

[0037] like Figure 1As shown, the oval body 1 is provided with multiple sets of insertion channels 11. The insertion channels 11 are used to insert the insertion steel needles 2, and the diameter of the insertion channel 11 is larger than the diameter of the insertion steel needles 2. Each insertion channel 11 is also provided with a hollow elastic limiting member 3 on its inner wall. The elastic limiting member 3 is tightened and connected to the insertion steel needles 2.

[0038] Better than Figure 3 As shown, the elastic limiting members 3 in the insertion channels 11 near or away from the oval body 1 half-plane are distributed on the inner wall of the entire insertion channel 11. The elastic limiting members 3 in the other insertion channels 11 are not completely distributed on the inner wall of the insertion channel 11. For example, the elastic limiting members 3 that are not completely distributed on the inner wall of the insertion channel 11 are set in the entrance section of the insertion channel 11, such as covering the first 1 / 3 of the length of the channel.

[0039] The insertion channel 11, which is closer to the central area of ​​the cervical tumor, is closer to the oval body 1 hemiplane. It can usually be directly aligned with the main lesion. The insertion path is relatively straight and requires less fine-tuning. By distributing the elastic limiting element 3 completely on the inner wall of the entire insertion channel 11, a uniform clamping force can be formed in the entire circumference, which enhances the initial positioning accuracy. In addition, for this kind of main lesion with a relatively clear location, there is no need for frequent fine-tuning. The completely fixed elastic limiting element 3 can make the steel needle quickly enter the position and shorten the operation time.

[0040] Since the part of the oval body 1 away from the semi-plane is spherical, the curvature of the spherical surface causes the path of the insertion channel 11 to be shortened, and the exposed part of the steel needle after insertion is relatively long. If the fixation is insufficient, it is easy to swing. By completely distributing the elastic limiting member 3 in the insertion channel 11, the stability of the steel needle 2 after insertion can be guaranteed, and the short channel fixation defect can be made up for.

[0041] The remaining insertion channels 11 are located between the two and are usually used to target eccentric, invasive or lobulated tumors. In actual use, multi-angle fine-tuning may be required to achieve precise needle placement. Therefore, the fine-tuning requirement for the insertion steel needle 2 is relatively large. By setting an incomplete elastic limiter 3, a larger fine-tuning range can be provided for the insertion steel needle 2, improving the flexibility of dose planning.

[0042] Specifically, the elastic limiting component 3 is made of TPE material, and the oval body 1 is made of PLA material. The elastic limiting component 3 and the oval body 1 are integrally formed by 3D printing. TPE material has high resilience and wear resistance, and is not prone to plastic deformation during repeated insertion and removal operations. Compared with traditional elastic materials such as silicone, it can significantly improve the service life of the applicator and reduce medical costs.

[0043] This embodiment takes the setting of three sets of insertion channels 11 on each oval body 1 as an example for detailed description. The aperture of each insertion channel 11 is 2mm, the diameter of the insertion steel needle 2 is 1.5-2mm, and in this embodiment, the diameter of the insertion steel needle 2 is preferably 1.5mm. The inner diameter of the elastic limiting member 3 is 1.5mm. The angle between the central axis of the insertion channel 11 and the dome tube on the applicator is 15-45°.

[0044] like Figure 3-4 As shown, for ease of distinction, in this embodiment, the insertion channels 11 set out from the hemisphere near the oval body 1 are referred to as the first insertion channel 111, the second insertion channel 112, and the third insertion channel 113. The steel needle inserted into the first insertion channel 111 is the first insertion steel needle 21, the steel needle inserted into the second insertion channel 112 is the second insertion steel needle 22, and the steel needle inserted into the third insertion channel 113 is the third insertion steel needle 23.

[0045] Among them, such as Figure 3 As shown, the elastic limiting member 3 within the second planting channel 112 is located at the entrance section of the second planting channel 112, and its length is one-third of the total length of the planting channel 11. Figure 1 As shown, in other embodiments besides this one, if the middle insertion channel 11 is a short channel, then elastic limiting members 3 are provided throughout the entire insertion channel 11.

[0046] Specifically, the angle between the central axis of the first insertion channel 111 and the dome tube is 15°, the angle between the second insertion channel 112 and the dome tube is 30°, and the angle between the third insertion channel 113 and the dome tube is 45°. It is worth noting that the number of insertion channels 11 and the angle with the dome tube in this embodiment are the optimal values. In other embodiments besides this embodiment, two or four sets of insertion channels 11 can be set on each oval body 1, and different angle values ​​can be selected.

[0047] This application uses an elastic limiting member 3 on the inner wall of the implantation channel 11 to fix the implantation needle 2, preventing the implantation needle 2 from slipping out of the implantation channel 11 after insertion due to the large inner diameter of the channel. The elastic limiting member 3 has a certain elastic deformation space and can adapt to the slight adjustment of the direction of the implantation needle 2, thereby enabling the direction of the implantation needle 2 to be slightly adjusted according to the tumor location after insertion, thus improving the positioning accuracy.

[0048] Furthermore, the elastic design of the elastic limiting component 3 ensures that the inserted steel needle 2 can be reset to the initial reference position with the same tension force each time it is inserted, avoiding positional deviations between sessions caused by material fatigue of the soft needle or differences in the doctor's operating force. Then, by combining with image guidance (such as CT / MRI), the steel needle can be quickly calibrated to the position consistent with the treatment plan before each treatment, ensuring the consistency of radiation source positioning in multiple radiotherapy sessions, thereby improving the accuracy of tumor target area dose coverage and avoiding the decline in efficacy due to the accumulation of errors in sessions.

[0049] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An oval-shaped body with an implantation function, characterized in that, The oval body is provided with multiple sets of insertion channels, which are used to insert insertion steel needles, and the diameter of the insertion channel is larger than the diameter of the insertion steel needle; each insertion channel is also provided with a hollow elastic limiting member on its inner wall, and the elastic limiting member is tightened and connected to the insertion steel needle.

2. An oval body with implantation function according to claim 1, characterized in that: The elastic limiting elements in the insertion channels near or away from the oval hemiplane are distributed on the inner wall of the entire insertion channel, while the elastic limiting elements in the other insertion channels are not completely distributed on the inner wall of the insertion channel.

3. An oval body with implantation function according to claim 2, characterized in that: Elastic limiting elements, which are not completely distributed on the inner wall of the planting channel, are set at the entrance section of the planting channel.

4. An oval body with implantation function according to claim 3, characterized in that: The elastic limiting component is made of TPE material.

5. An oval body with implantation function according to claim 4, characterized in that: The elastic limiting component and the oval body are integrally formed by 3D printing.

6. An oval body with implantation function according to any one of claims 1-5, characterized in that: The insertion channel has a diameter of 2mm, the insertion steel needle has a diameter of 1.5-2mm, and the elastic limiting member has an inner diameter of 1.5mm.

7. An oval body with implantation function according to claim 6, characterized in that: The oval body comprises a semi-cylindrical middle section and transitional hemispheres located at both ends of the middle section.

8. An oval body with implantation function according to claim 7, characterized in that: The implantation channel is provided in three sets, namely the first implantation channel, the second implantation channel, and the third implantation channel, which are located from the hemisphere closest to the oval body outwards; the elastic limiting member in the second implantation channel is provided in the entrance section of the second implantation channel.

9. An oval body with implantation function according to claim 8, characterized in that: The angle between the central axis of the insertion channel and the dome tube on the applicator is 15-45°.

10. An oval body with implantation function according to claim 9, characterized in that: The angle between the central axis of the first insertion channel and the dome tube is 15°, the angle between the second insertion channel and the dome tube is 30°, and the angle between the third insertion channel and the dome tube is 45°.

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