A radioactive seed implant needle for tumor interventional radiology

Abstract

This invention relates to the field of medical devices, specifically to a radioactive particle implantation needle for interventional radiology of tumors. The needle includes an implantation needle body with a delivery channel along its length. A material storage slot communicating with the delivery channel is located in the middle of the implantation needle body. The material storage slot contains a supply compartment with a particle placement cavity. A sealing mechanism for sealing the particle placement cavity is located at the bottom of the supply compartment. The supply compartment also contains a compression mechanism for compressing radioactive particles towards the bottom of the particle placement cavity. This invention employs a detachable integrated structure for the implantation needle body and supply compartment, allowing for pre-loading of particles before surgery. This eliminates the need for manual loading of particles into the delivery channel during surgery using external tools, reducing intraoperative steps. The fixing bolts and threaded holes enable quick assembly and disassembly, further shortening preoperative preparation and surgical time, and improving operational convenience.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to a radioactive particle implantation needle for interventional radiotherapy in tumors. Background Technology

[0002] Radioactive particle implantation therapy is a commonly used minimally invasive method in clinical interventional radiotherapy for tumors. It involves precisely implanting radioactive particles into the tumor target area, utilizing the continuously released radiation to kill tumor cells. It is widely used in the treatment of solid tumors such as prostate cancer, lung cancer, and liver cancer. The radioactive particle implantation needle, as the core instrument for completing the implantation procedure, directly affects the accuracy of the implantation, the efficiency of the procedure, and the safety of clinical use.

[0003] Currently used radioactive particle implantation needles in clinical practice are mostly traditional structures with a single puncture channel. During use, the needle must first be inserted into the tumor target area, and then radioactive particles are manually loaded into the needle channel using external tools. This process is complex and time-consuming, extending the overall surgical time. Furthermore, these implantation needles lack an integrated feeding structure, making it prone to accidental drop or displacement of particles during loading. The particles also cannot be arranged orderly within the needle channel, easily leading to jamming and simultaneous discharge of multiple particles during delivery, making it difficult to ensure uniform particle implantation and affecting the effectiveness of tumor radiotherapy. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution.

[0005] A radioactive particle implantation needle for interventional radiotherapy for tumors includes an implantation needle body with a push channel along its length and a push rod for pushing radioactive particles slidably disposed in the push channel; a material storage slot communicating with the push channel is provided in the middle of the implantation needle body, a material storage slot is provided in the material storage slot, a particle placement cavity for storing radioactive particles is provided in the material storage slot along its height, a sealing mechanism for sealing the particle placement cavity is provided at the bottom end of the material storage slot, and a squeezing mechanism for squeezing the radioactive particles toward the bottom end of the particle placement cavity is also provided in the material storage slot.

[0006] As a preferred embodiment of the present invention, the bottom end of the feeding hopper is provided with a bottom cover, and a block mounting groove is formed between the bottom cover and the bottom end face of the feeding hopper. The bottom cover is provided with a bottom cover through hole corresponding to the particle placement cavity. The feeding hopper is provided with a sealing mechanism mounting cavity communicating with the block mounting groove. The sealing mechanism includes an adjusting rod rotatably disposed in the sealing mechanism mounting cavity. A block is provided at the adjusting rod in the block mounting groove. The block can rotate with the adjusting rod to block the radioactive particles at the bottom end of the particle placement cavity.

[0007] As a preferred embodiment of the present invention, one end of the sealing mechanism mounting cavity extends toward the particle placement cavity and communicates with the particle placement cavity. The extrusion mechanism includes a sleeve disposed in the sealing mechanism mounting cavity and sleeved on the adjusting rod. An annular plate is provided at the sleeve, and an extrusion block is provided at the annular plate. The end of the extrusion block extends into the particle placement cavity, and a spring for extruding the annular plate is sleeved at the sleeve.

[0008] As a preferred embodiment of the present invention, the top of the feeding hopper is provided with a top cover, and an extrusion block mounting groove is formed between the top cover and the top surface of the feeding hopper. The top cover is provided with a top cover through hole corresponding to the particle placement cavity. The outer wall of the sleeve is provided with a strip groove, and the inner wall of the annular plate is provided with a protrusion that fits with the strip groove. The extrusion block at the annular plate can rotate with the sleeve to be misaligned with the particle placement cavity so as to limit the extrusion block in the height direction of the feeding hopper.

[0009] As a preferred embodiment of the present invention, both the lever and the sleeve extend out of the top cover.

[0010] As a preferred embodiment of the present invention, the sealing mechanism mounting cavity is provided with a lifting mechanism for lifting the annular plate. The lifting mechanism includes a support plate sleeved on the sleeve and located at the lower end of the annular plate. The side wall of the feeding hopper is provided with an opening groove communicating with the sealing mechanism mounting cavity. The upper end of the opening groove extends to the top cover. A connecting column is slidably provided in the opening groove, perpendicular to the support plate and connected to the support plate. The top end of the connecting column is provided with a lever perpendicular to the connecting column.

[0011] As a preferred embodiment of the present invention, a handle is provided on the side wall of the implantation needle body.

[0012] As a preferred embodiment of the present invention, one end of the implantation needle body is provided with a Luer connector.

[0013] As a preferred embodiment of the present invention, the side wall of the feeding bin is provided with a threaded hole, and the implantation needle body is provided with a fixing bolt, the end of the fixing bolt being able to rotate into the threaded hole to fix the feeding bin.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. This invention adopts a detachable structure integrating the implantation needle body and the feeding chamber, which allows for pre-loading of particles before surgery, eliminating the need for manual loading of particles into the delivery channel with external tools during surgery, thus reducing the number of steps during surgery; the fixing bolts and threaded holes enable quick assembly and disassembly, which to some extent shortens the preoperative preparation and operation time and improves the convenience of operation.

[0016] 2. In this invention, the extrusion block of the extrusion mechanism, in conjunction with a spring, applies continuous extrusion force to the particles, causing the particles to be arranged in an orderly manner within the chamber, reducing the probability of particle shaking or displacement, and improving the stability of particle storage.

[0017] 3. In this invention, the feeding chamber adopts a pre-installed and detachable design, which can be quickly replaced after the particles in a single chamber are exhausted, without interrupting the surgery to refill the particles. This improves the continuity of particle implantation operations to a certain extent and is suitable for the clinical need to implant multiple particles in a single surgery. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the radioactive particle implantation needle used in interventional radiology for tumors in Example 1;

[0019] Figure 2 This is a cross-sectional view of the radioactive particle implantation needle used in interventional radiology for tumor treatment in Example 1.

[0020] Figure 3 This is a cross-sectional view of the radioactive particle implantation needle used in interventional radiology for tumor treatment in Example 1.

[0021] Figure 4 This is a schematic diagram of the feeding hopper in Example 1;

[0022] Figure 5 This is a cross-sectional view of the feed hopper in Example 1;

[0023] Figure 6 This is a schematic diagram of the adjusting rod and sleeve in Example 1;

[0024] Figure 7 This is a partial structural diagram of the feeding hopper in Example 1;

[0025] Figure 8 This is a schematic diagram of the top cover structure in Example 1;

[0026] Figure 9 This is a schematic diagram of the bottom cover structure in Example 1.

[0027] The attached figures are labeled as follows:

[0028] 110. Implant needle body; 120. Push rod; 130. Feeding hopper; 140. Handle; 150. Luer connector; 210. Pushing channel; 220. Feeding hopper slot; 230. Particle placement chamber; 310. Threaded hole; 320. Fixing bolt; 410. Bottom cover; 420. Top cover; 430. Top cover through hole; 510. Stop block mounting slot; 520. Bottom cover through hole; 530. Adjusting rod; 540. Stop block; 550. Sealing mechanism mounting chamber; 560. Sleeve; 570. Annular plate; 580. Extrusion block; 590. Spring; 5100. Extrusion block mounting slot; 5110. Support plate; 5120. Opening slot; 5130. Connecting column; 5140. Pulley; 610. Strip groove; 620. Protrusion. Detailed Implementation

[0029] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0030] Example 1, such as Figure 1-9 As shown, this embodiment provides a radioactive particle implantation needle for interventional radiology of tumors. The implantation needle includes an implantation needle body 110, with a push channel 210 along its length. A push rod 120 is slidably disposed within the push channel 210, and the push rod 120 is used to push the radioactive particles to the target surgical position along the push channel 210. A handle 140 is provided on the side wall of the implantation needle body 110 for easy gripping and operation by the operator. A Luer connector 150 is provided at one end of the implantation needle body 110 to adapt to the connection requirements of routine clinical interventional instruments. A material storage slot 220 is provided in the middle of the implantation needle body 110, which is connected to the push channel 210. A detachable material supply slot 130 is disposed within the material storage slot 220. A threaded hole 310 is provided on the side wall of the material supply slot 130. A fixing bolt 320 is rotatably disposed on the implantation needle body 110, and the end of the fixing bolt 320 can be screwed into the threaded hole 310 to fix the material supply slot 130 within the material storage slot 220. The feed hopper 130 has a particle placement cavity 230 along its height direction, which is used to store radioactive particles.

[0031] A bottom cover 410 is provided at the bottom of the feeding hopper 130. A stop block mounting groove 510 is formed between the bottom cover 410 and the bottom surface of the feeding hopper 130. A bottom cover through hole 520 is provided on the bottom cover 410 corresponding to the position of the particle placement cavity 230, and the bottom cover through hole 520 is used for the passage of radioactive particles. A sealing mechanism mounting cavity 550 is provided inside the feeding hopper 130, and the sealing mechanism mounting cavity 550 is connected to the stop block mounting groove 510. A sealing mechanism is provided at the bottom of the feeding hopper 130. The sealing mechanism includes an adjusting rod 530, which is rotatably mounted in the sealing mechanism mounting cavity 550. A stop block 540 is provided on the adjusting rod 530. The stop block 540 is located in the stop block mounting groove 510. The stop block 540 can rotate with the adjusting rod 530 to block the radioactive particles at the bottom of the particle placement cavity 230.

[0032] One end of the sealing mechanism mounting cavity 550 extends into and communicates with the particle placement cavity 230. A compression mechanism is installed within the feeding hopper 130. The compression mechanism includes a sleeve 560, which is located within the sealing mechanism mounting cavity 550 and sleeved around the adjusting rod 530. An annular plate 570 is mounted on the sleeve 560, and a compression block 580 is mounted on the annular plate 570. The end of the compression block 580 extends into the particle placement cavity 230. A spring 590 is sleeved around the outside of the sleeve 560. The spring 590 applies an elastic force to the annular plate 570, causing the compression block 580 to compress radioactive particles towards the bottom of the particle placement cavity 230.

[0033] A top cover 420 is provided at the top of the feeding hopper 130. A compression block mounting groove 5100 is formed between the top cover 420 and the top surface of the feeding hopper 130. A top cover through hole 430 is provided on the top cover 420 corresponding to the particle placement cavity 230, for adding radioactive particles into the particle placement cavity 230. A strip-shaped groove 610 is provided on the outer wall of the sleeve 560, and a protrusion 620 is provided on the inner wall of the annular plate 570. The protrusion 620 and the strip-shaped groove 610 are in clearance fit, allowing the annular plate 570 to slide axially along the sleeve 560. The compression block 580 on the annular plate 570 can rotate with the sleeve 560 to be misaligned with the particle placement cavity 230, thus limiting the compression block 580 in the height direction of the feeding hopper 130. The lever of the adjusting rod 530 and the sleeve 560 both extend out of the top cover 420, facilitating rotational adjustment by the operator.

[0034] A lifting mechanism is installed within the sealing mechanism mounting cavity 550, used to lift the annular plate 570. The lifting mechanism includes a support plate 5110, which is sleeved on the outside of the sleeve 560 and located at the lower end of the annular plate 570. An opening slot 5120 is formed in the side wall of the feeding hopper 130, communicating with the sealing mechanism mounting cavity 550, and extending to the top cover 420. A connecting post 5130 is slidably installed within the opening slot 5120, perpendicularly connected to the support plate 5110. A lever 5140 is installed at the top of the connecting post 5130, perpendicularly positioned to the connecting post 5130, allowing the operator to move the support plate 5110 axially via the lever 5140.

[0035] The specific principle of the radioactive particle implantation needle used in interventional radiology for tumor treatment in this embodiment is as follows:

[0036] Before surgery, the feed hopper 130 is removed from the feed hopper placement slot 220 to prepare for particle filling. The adjusting rod 530 extending from the top cover 420 is rotated, causing the stop block 540 to rotate within the stop block mounting slot 510, moving the stop block 540 to the bottom of the particle placement cavity 230, sealing the bottom opening and preventing leakage during particle filling. The lever 5140 is pushed upwards, causing the connecting column 5130 to slide upwards along the opening slot 5120. The connecting column 5130 drives the support plate 5110 to move upwards along the sleeve 560, lifting the annular plate 570 into the extrusion block mounting slot 5100. The sleeve 560 extending from the top cover 420 is rotated, causing the extrusion block 580 to rotate with the annular plate 570 until it is misaligned with the particle placement cavity 230. The extrusion block mounting slot 5100 provides height restriction for the extrusion block 580, preventing the extrusion structure from interfering with particle filling. Radioactive particles are added into the particle placement cavity 230 through the top cover through hole 430, and the particles are stacked and arranged in the cavity. After the particles are added, the sleeve 560 is rotated in the opposite direction, so that the compression block 580 rotates back to the position corresponding to the particle placement cavity 230, and the height limit is released. The spring 590 releases the elastic force, pushing the annular plate 570 to move downward, and the compression block 580 moves to the bottom of the particle placement cavity 230, applying downward compression force to the particles. With the help of the bottom stop block 540, the particles are stably limited in the particle placement cavity 230, completing the preoperative pre-loading.

[0037] During the operation, the pre-loaded particle supply chamber 130 is placed into the material storage slot 220, and the position is adjusted so that the bottom cover through hole 520 is aligned with the push channel 210; the fixing bolt 320 is rotated so that its end is screwed into the threaded hole 310, and the supply chamber 130 is fixed on the implantation needle body 110 to prevent displacement during the operation.

[0038] After the feed chamber is fixed, rotating the adjusting rod 530 causes the stop block 540 to rotate, misaligning the stop block 540 with the bottom of the particle placement cavity 230 and releasing the bottom blockage. Under the continuous force of the spring 590, the squeezing block 580 applies a downward pushing force to the particles. Under the combined action of the squeezing force and their own gravity, the particles sequentially pass through the bottom cover through hole 520 and enter the pushing channel 210. The operator holds the handle 140 and pushes the push rod 120 to slide along the pushing channel 210, pushing the particles in the channel to the tumor target area to complete single particle implantation. Repeating the pushing operation can achieve continuous particle implantation. After the particles in the feed chamber 130 are used up, the fixing bolt 320 is rotated in the opposite direction to unlock and the empty chamber is removed. A new feed chamber 130 pre-filled with particles is then replaced and fixed, and the surgery can continue without interrupting the operation to refill particles.

[0039] The radioactive particle implantation needle for interventional radiotherapy in this embodiment, through the above-described method, can achieve the following beneficial effects:

[0040] 1. In this embodiment, the radioactive particle implantation needle for interventional radiology of tumors adopts an integrated detachable structure of the implantation needle body 110 and the feeding chamber 130, which can complete the pre-loading of particles before the operation, eliminating the need for manual loading of particles into the pushing channel with external tools during the operation, thus reducing the number of operation steps during the operation; the fixing bolt 320 and the threaded hole 310 cooperate to achieve quick assembly and disassembly, which to a certain extent shortens the preoperative preparation and operation time and improves the convenience of operation.

[0041] 2. In the radioactive particle implantation needle for interventional radiology of tumors in this embodiment, the block 540 of the sealing mechanism can seal the bottom of the particle placement cavity 230 during the filling and transportation stages, reducing the leakage of particles from the bottom of the chamber; the compression block 580 of the compression mechanism, together with the spring 590, applies continuous compression force to the particles, so that the particles are arranged in an orderly manner in the chamber, reducing the probability of particle shaking and displacement, and improving the stability of particle storage.

[0042] 3. In the radioactive particle implantation needle for interventional radiotherapy in this embodiment, the particles enter the delivery channel 210 in an orderly manner under the action of squeezing force and gravity, avoiding disordered particle stacking that could cause channel blockage and reducing the possibility of particle jamming during delivery; the orderly feeding method can reduce the situation where multiple particles enter the delivery channel at the same time, which helps to improve the uniformity of particle implantation and improve the problem of uneven particle distribution affecting the treatment effect.

[0043] 4. In the radioactive particle implantation needle for interventional radiology of tumors in this embodiment, the feed chamber 130 adopts a pre-loaded and detachable design. After the particles in a single chamber are exhausted, it can be quickly replaced without interrupting the surgery to refill the particles. This improves the continuity of particle implantation operation to a certain extent and is suitable for the clinical need to implant multiple particles in a single surgery.

[0044] The procedure for using the radioactive particle implantation needle in interventional oncology radiotherapy in this example is as follows:

[0045] The operator first removes the feed hopper 130 from the feed hopper placement slot 220 of the implantation needle body 110, rotates the adjusting rod 530 extending from the top cover 420, causing the stop block 540 to rotate within the stop block mounting slot 510, thus blocking the bottom opening of the particle placement cavity 230. The operator then moves the lever 5140 upwards, causing the connecting column 5130 to slide upwards along the opening slot 5120, and through the support plate 5110, pulls the annular plate 570 along the strip groove 610 of the sleeve 560 into the extrusion block mounting slot 5100. The operator then rotates the sleeve 560, causing the extrusion block 580 on the annular plate 570 to be misaligned with the particle placement cavity 230 and height-limited. Radioactive particles are then added into the particle placement cavity 230 through the top cover through hole 430 of the top cover 420. After the particles are added, the operator rotates the sleeve 560 in the opposite direction to release the extrusion block 580. The spring 590 at sleeve 560 releases its elastic force to push the annular plate 570 downward, causing the extrusion block 580 to extrude particles towards the bottom of the particle placement cavity 230. This, in conjunction with the stop block 540, completes the stable positioning of the particles and completes the pre-operative particle preloading operation.

[0046] Place the pre-loaded particle feeding chamber 130 into the feeding chamber placement slot 220, and adjust the position of the feeding chamber 130 so that the bottom cover through hole 520 of the bottom cover 410 is precisely aligned with the push channel 210; rotate the fixing bolt 320 on the implantation needle body 110 so that the end of the fixing bolt 320 is screwed into the threaded hole 310 of the feeding chamber 130, thereby fixing the feeding chamber 130 in the feeding chamber placement slot 220 and preventing the feeding chamber 130 from shifting during the operation.

[0047] Rotating the adjusting rod 530 causes the stop block 540 to rotate, releasing the block block 540 from blocking the bottom of the particle placement cavity 230. Under the combined action of the continuous squeezing force of the squeezing block 580 and its own gravity, the particles enter the pushing channel 210 through the bottom cover through hole 520. The operator holds the handle 140 on the side wall of the implantation needle body 110 and pushes the push rod 120 to slide axially along the pushing channel 210, pushing the radioactive particles in the pushing channel 210 to the tumor target area, completing the single particle implantation operation. Repeating the pushing steps can achieve continuous particle implantation.

[0048] After the particles in the feeding chamber 130 are used up, the locking bolt 320 is rotated in the opposite direction to release the locking of the feeding chamber 130, and the empty chamber is removed from the feeding chamber placement slot 220; a new feeding chamber 130 pre-loaded with particles is replaced and fixed, and the above feeding and pushing steps can be repeated. The particle implantation operation can be carried out continuously without interrupting the surgery. The Luer connector 150 at the end of the implantation needle body 110 can be adapted to clinical interventional instruments, further improving the adaptability of the device.

[0049] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. A radioactive particle implantation needle for interventional radiotherapy in tumors, characterized in that: The device includes an implantation needle body (110), a push channel (210) is provided along its length in the implantation needle body (110), and a push rod (120) for pushing radioactive particles is slidably provided in the push channel (210); a hopper placement groove (220) communicating with the push channel (210) is provided in the middle of the implantation needle body (110), a feeding hopper (130) is provided in the feeding hopper (220), a particle placement cavity (230) for storing radioactive particles is provided in the feeding hopper (130) along its height, a sealing mechanism for sealing the particle placement cavity (230) is provided at the bottom end of the feeding hopper (130), and a squeezing mechanism for squeezing radioactive particles toward the bottom end of the particle placement cavity (230) is also provided in the feeding hopper (130).

2. The radioactive particle implantation needle for interventional radiotherapy in tumors according to claim 1, characterized in that: The bottom end of the feeding hopper (130) is provided with a bottom cover (410), and a block mounting groove (510) is formed between the bottom cover (410) and the bottom end face of the feeding hopper (130). The bottom cover (410) is provided with a bottom cover through hole (520) corresponding to the particle placement cavity (230). The feeding hopper (130) is provided with a blocking mechanism mounting cavity (550) communicating with the block mounting groove (510). The blocking mechanism includes an adjusting rod (530) rotatably disposed in the blocking mechanism mounting cavity (550). A block (540) is provided at the adjusting rod (530) located in the block mounting groove (510). The block (540) can rotate with the adjusting rod (530) to block the radioactive particles at the bottom end of the particle placement cavity (230).

3. The radioactive particle implantation needle for interventional radiotherapy in tumors according to claim 2, characterized in that: One end of the sealing mechanism mounting cavity (550) extends toward the particle placement cavity (230) and communicates with the particle placement cavity (230). The extrusion mechanism includes a sleeve (560) disposed in the sealing mechanism mounting cavity (550) and sleeved on the adjusting rod (530). An annular plate (570) is provided at the sleeve (560), and an extrusion block (580) is provided at the annular plate (570). The end of the extrusion block (580) extends into the particle placement cavity (230), and a spring (590) for extruding the annular plate (570) is sleeved at the sleeve (560).

4. The radioactive particle implantation needle for interventional radiotherapy in tumors according to claim 3, characterized in that: The top of the feeding hopper (130) is provided with a top cover (420), and an extrusion block mounting groove (5100) is formed between the top cover (420) and the top surface of the feeding hopper (130). The top cover (420) is provided with a top cover through hole (430) corresponding to the particle placement cavity (230). The outer wall of the sleeve (560) is provided with a strip groove (610), and the inner wall of the annular plate (570) is provided with a protrusion (620) that is in clearance fit with the strip groove (610). The extrusion block (580) at the annular plate (570) can rotate with the sleeve (560) to be misaligned with the particle placement cavity (230) so as to limit the extrusion block (580) in the height direction of the feeding hopper (130).

5. A radioactive particle implantation needle for interventional radiotherapy in tumors according to claim 4, characterized in that: Both the lever and the sleeve (560) extend out of the top cover (420).

6. The radioactive particle implantation needle for interventional radiotherapy in tumors according to claim 4, characterized in that: The sealing mechanism mounting cavity (550) is provided with a lifting mechanism for lifting the annular plate (570). The lifting mechanism includes a support plate (5110) sleeved on the sleeve (560) and located at the lower end of the annular plate (570). The side wall of the feeding hopper (130) is provided with an opening groove (5120) that communicates with the sealing mechanism mounting cavity (550). The upper end of the opening groove (5120) extends to the top cover (420). A connecting column (5130) is slidably provided in the opening groove (5120) and is perpendicular to and connected to the support plate (5110). The top end of the connecting column (5130) is provided with a lever (5140) perpendicular to the connecting column (5130).

7. The radioactive particle implantation needle for interventional radiotherapy in tumors according to claim 1, characterized in that: A handle (140) is provided on the side wall of the implantation needle body (110).

8. The radioactive particle implantation needle for interventional radiotherapy in tumors according to claim 1, characterized in that: One end of the implantation needle body (110) is provided with a Luer connector (150).

9. A radioactive particle implantation needle for interventional radiotherapy in tumors according to claim 1, characterized in that: The side wall of the feeding bin (130) is provided with a threaded hole (310), and a fixing bolt (320) is rotatably provided at the implantation needle body (110). The end of the fixing bolt (320) can be rotated into the threaded hole (310) to fix the feeding bin (130).

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