CN221013408U - Puncture needle for seed implantation - Google Patents

Abstract

The utility model provides a seed implantation puncture needle, which comprises a needle core, a needle tube, a needle core seat and a needle tube seat, wherein the needle core seat is arranged on the needle tube seat; the proximal end of the needle core is fixedly connected with the needle core seat; the needle tube seat comprises an inner cavity and an insertion port communicated with the inner cavity, and the insertion port is positioned at the proximal end of the needle tube seat; the proximal end of the needle tube is fixedly connected with the needle tube seat and communicated with the inner cavity; the inner cavity is provided with a one-way film, and the distal end of the needle core can be inserted into the needle tube through the insertion hole through the one-way film and extend out to a puncture position outside the needle tube; when the distal end of the needle core extends to a puncture position outside the needle tube, the needle tube seat is releasably connected with the needle core seat. The seed implantation puncture needle can prevent blood in the seed implantation puncture needle from flowing back to the far end.

Description

Puncture needle for seed implantation

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a seed implantation puncture needle.

Background

For solid tumors of human bodies, radioactive seed implantation treatment is an advanced minimally invasive tumor treatment method developed in recent years. The radioactive seed implantation treatment has the advantages of minimally invasive, gradual change, high efficiency, small side effect and the like. In practice, radioactive seeds are generally implanted into a focus position through a seed implantation puncture needle under the guidance of imaging equipment such as CT or ultrasound.

However, the existing seed implantation puncture needle has the phenomenon of negative pressure blood return in the puncture and implantation process of radioactive seed implantation treatment. When in puncture, the human body, the puncture needle tube and the outside are sequentially communicated to form a channel, and negative pressure is formed between the human body and the outside. Negative pressure can cause blood in the body to flow back through the needle cannula to the distal end of the needle hub, thereby causing the risk of contaminating the seed implanter with blood that flows back and ejecting the particles out of the needle hub during the process of placing the seeds into the needle hub with the seed implanter.

Disclosure of utility model

The utility model aims to: the utility model aims to solve the technical problems of the prior art and provides the seed implantation puncture needle which can prevent blood in the seed implantation puncture needle from flowing back towards the far end of the seed implantation puncture needle, prevent the blood from flowing back from polluting the seed implanter and prevent the blood from flowing back from ejecting particles out of a needle seat.

In order to solve the technical problems, the utility model discloses a seed implantation puncture needle. The seed implantation puncture needle comprises a needle core, a needle tube, a needle core seat and a needle tube seat. The proximal end of the needle core is fixedly connected with the needle core seat. The needle tube seat comprises an inner cavity and an inserting port communicated with the inner cavity, and the inserting port is positioned at the proximal end of the needle tube seat. The proximal end of the needle tube is fixedly connected with the needle tube seat and communicated with the inner cavity. The inner cavity is provided with a one-way film, and the distal end of the needle core can be inserted into the needle tube through the insertion hole through the one-way film and extend to a puncture position outside the needle tube. When the distal end of the needle core extends to a puncture position outside the needle tube, the needle tube seat is releasably connected with the needle core seat.

In the application, the unidirectional film is additionally arranged in the inner cavity of the needle tube seat, so that negative pressure can be prevented by the unidirectional film, the blood in the seed implantation puncture needle is prevented from flowing back towards the insertion opening at the far end of the needle tube seat, the seed implanter is prevented from being polluted by the flowing back blood, and the particles are prevented from being ejected out of the needle tube seat by the flowing back blood.

Specifically, four flap openings are formed in the unidirectional film.

Specifically, when the distal end of the needle core extends to a puncture position outside the needle tube, the distal end of the needle core and the distal end of the needle tube are combined to form a needle tip structure.

Specifically, the tip of the needle core is triangular pyramid-shaped, and the distal end of the needle tube is triangular pyramid frustum-shaped. When the distal end of the needle core extends to a puncture position outside the needle tube, the tip of the triangular pyramid-shaped needle core and the distal end of the needle tube are combined to form a triangular pyramid-shaped needle point structure.

Specifically, for each side face of the triangular pyramid, the included angle formed between the side face and a plane passing through the bottom side of the side face and perpendicular to the bottom face of the triangular pyramid is 18 °.

Specifically, the inner cavity comprises a guide section, the guide section is conical and is communicated with the needle tube, and the diameter of the guide section is reduced from the inserting opening to the direction of the needle tube and is used for guiding radioactive seeds placed through the inserting opening into the needle tube.

In particular, the cone angle of the guide section is 13 °.

Specifically, an elastic clamping piece is arranged at the proximal end of the needle core seat, and an elastic clamping hook is arranged at the proximal end of the elastic clamping piece. The side wall of the needle tube seat is provided with a channel for the elastic clamping piece to pass through and a positioning groove positioned at the proximal end of the channel, and the positioning groove is used for clamping the elastic clamping hook of the elastic clamping piece when the distal end of the needle core extends to a puncture position outside the needle tube. When a user moves the needle core seat towards a direction away from the needle tube, the elastic clamping hook of the elastic clamping piece slides out of the positioning groove.

Further, the needle tube also comprises more than one developing mark, and the more than one developing mark is arranged on the outer wall surface of the needle tube at intervals along the axial direction.

Further, the needle tube comprises a cursor which is slidably sleeved on the outer side wall of the needle tube.

The beneficial effects are that:

(1) According to the utility model, the unidirectional film is arranged in the inner cavity, so that the unidirectional film can prevent negative pressure, and the blood in the seed implantation puncture needle is prevented from flowing back to the insertion port at the distal end of the needle tube seat, so that the seed implanter is prevented from being polluted by the flowing back blood, and the particles are prevented from being ejected out of the needle tube seat by the flowing back blood.

(2) The needle point structure is arranged to be triangular pyramid. Compared with the existing needle point structure, the triangular pyramid-shaped needle point structure has better puncture effect and puncture force.

(3) According to the utility model, the conical angle of the guide section is set to be 13 degrees, so that the seeds can be guided into the needle tube more conveniently.

(4) The needle core seat is provided with an elastic clamping piece at the proximal end, and an elastic clamping hook is arranged at the proximal end of the elastic clamping piece; the side wall of the needle tube seat is provided with a channel for the elastic clamping piece to pass through and a positioning groove positioned at the proximal end of the channel, and the positioning groove is used for clamping the elastic clamping hook of the elastic clamping piece when the distal end of the needle tube extends to a puncture position outside the needle tube so as to realize the fixed connection of the needle tube seat and the circumferential positioning between the needle tube seat and the needle tube seat. The needle tube seat and the needle core seat which are fixedly connected are more convenient for puncture; when a user moves the needle core seat towards a direction away from the needle tube, the elastic clamping hook of the elastic clamping piece slides out of the positioning groove, so that the needle tube seat is separated from the needle core seat, and the needle core can be withdrawn from the insertion port so as to be convenient for placing radioactive particles. Compared with the prior needle tube seat and the needle core seat which are clamped by using the circular convex points and the arc-shaped grooves, the utility model has larger contact area by using the elastic clamping hooks and the positioning grooves, is convenient for plugging and unplugging, can ensure stable connection and increases the safety and reliability of the operation.

Drawings

The foregoing and/or other advantages of the utility model will become more apparent from the following detailed description of the utility model when taken in conjunction with the accompanying drawings and detailed description.

FIG. 1 is a perspective view showing a seed-implanting puncture needle according to an embodiment of the present utility model;

FIG. 2 is an axial cross-sectional view of a front view of the seed-implantation needle of FIG. 1;

FIG. 3 is a schematic perspective view of a unidirectional film in the seed implantation needle of FIG. 2;

FIG. 4 is a schematic diagram showing a three-dimensional structure of the unidirectional film shown in FIG. 3;

FIG. 5 is a perspective view showing a bevel-type needle tip structure formed by combining the tip of a needle core and the distal end of a needle tube when a conventional seed implantation needle is in a combined state;

FIG. 6 is a schematic perspective view of a beveled tip structure of FIG. 5;

FIG. 7 is a perspective view showing a triangular pyramid-shaped tip structure formed by combining the tip of a needle core and the distal end of a needle tube in a seed implantation puncture needle according to an embodiment of the present application;

FIG. 8 is a schematic perspective view II of the triangular pyramid-shaped tip structure of FIG. 7;

Fig. 9 is an exploded view showing a conventional connection structure between a needle holder and a needle core holder in a seed implantation puncture needle.

Fig. 10 is an exploded view of the connection between the needle cannula mount and the core mount in the seed implantation needle of fig. 1.

Fig. 11 is an exploded view of a connection structure between the needle tube holder and the core holder in the seed implantation puncture needle of fig. 1.

The reference numerals of the present application are as follows:

Radioactive seeds 000, a needle core 100, a needle tube 200, a needle core seat 300, an elastic clamping piece 310, an elastic clamping hook 311, an annular inner cavity 320, a needle tube seat 400, a guide section 411, an insertion opening 420, a positioning slot 430, a channel 440, a limiting boss 450, a unidirectional film 500, an annular pressing block 600, a cursor 700 and a developing mark 800.

Detailed Description

The technical scheme of the present application is described in detail below with reference to the accompanying drawings.

The utility model provides a seed implantation puncture needle. As shown in fig. 1 and 2, the seed implantation puncture needle includes a needle core 100, a needle tube 200, a needle core holder 300, and a needle tube holder 400. The materials of the needle core 100 and the needle tube 200 can be medical stainless steel materials. Both the needle core holder 300 and the needle tube holder 400 can be made of transparent medical PC material by injection molding.

As shown in fig. 2, the proximal end of the needle 100 is fixedly connected to the needle mount 300. The needle cannula holder 400 includes an interior cavity and an insertion port 420 in communication with the interior cavity, the insertion port 420 being located at a proximal end face of the needle cannula holder 400. The proximal end of the needle cannula 200 is fixedly coupled to the needle cannula mount 400 and communicates with the interior cavity. As shown in fig. 2, the inner cavity is provided with a unidirectional film 500, and the distal end of the core 100 can be inserted into the needle tube 200 through the insertion port 420 through the unidirectional film 500 and protrude to a puncture position outside the needle tube 200. The needle tube holder 400 is releasably coupled to the core holder 300 when the distal end of the needle 100 is extended to a penetration position beyond the needle tube 200.

The use process of the seed implantation puncture needle is as follows:

When the seed-implanting puncture needle is used for puncturing, the distal end of the needle core 100 is first inserted into the needle tube 200 through the insertion port 420 through the unidirectional film 500 and protrudes to a puncturing position outside the needle tube 200, and the needle tube holder 400 and the needle core holder 300 are releasably connected. The needle holder 400 and the needle holder 300 are then held and an external force is applied in an axially distal direction so that the front end of the seed implantation needle pierces to the position in the body where the seed is to be implanted.

The connection between the needle holder 400 and the needle holder 300 is then released, the needle holder 300 is held by hand and moved in the axial proximal direction, and the needle 100 is withdrawn from the insertion port 420 for seed implantation. The radioactive seeds 000 are placed from the insertion port 420 into the inner cavity space outside the unidirectional film 500 by using a seed implanter, the radioactive seeds 000 pass through the unidirectional film 500 and then fall into the needle tube 200 through the inner cavity, and finally the radioactive seeds 000 are pushed into the body by using the needle core 100. The seed implanter is prior art and is not shown in the figures.

By arranging the unidirectional film 500, the blood inside the seed implantation puncture needle can be prevented from flowing back to the insertion port 420 at the far end of the needle tube seat 400, so that the seed implanter is prevented from being polluted by the flowing back blood, and the radioactive seeds 000 are prevented from being ejected out of the needle core seat 300 by the flowing back blood. The unidirectional film 500 may be made of medical silica gel. As shown in fig. 3 and 4, the unidirectional film 500 is provided with four flaps, so that the needle core 100 can be inserted into the needle tube 200, and the flaps of the unidirectional film 500 are attached to the outer side wall of the needle core 100 when inserted.

In some embodiments, as shown in fig. 2, the circumferential edge of the unidirectional membrane 500 is secured in the inner cavity by an annular pressure block 600. The pressure block 600 may be a soft hemostatic sponge that is adhesively secured to the needle cannula mount 400.

In some embodiments, as shown in fig. 1, the distal end of the needle 100 combines with the distal end of the needle cannula 200 to form a needle tip structure when the distal end of the needle 100 extends to a penetration location beyond the needle cannula 200.

When the conventional seed implantation puncture needle is in a combined state, the tip of the needle core 100 and the distal end of the needle tube 200 are combined to form a needle tip structure of the seed implantation puncture needle, which is generally in a bevel shape, as shown in fig. 5 and 6. The average puncture force of the bevel-type needle tip structure is 3.98N. For harder solid tumors, focal positions are difficult to puncture, the inclined needle is easy to twist and deform after puncture, and seeds cannot enter the tumor through the needle tube.

In some embodiments, to improve the penetration ability of the seed implantation needle, the needle tip structure is triangular pyramid shaped as shown in fig. 7 and 8. The triangular pyramid-shaped needle tip structure has better puncture effect and puncture force.

Specifically, as shown in fig. 7 and 8, the tip of the needle core 100 has a triangular pyramid shape, and the distal end of the needle tube 200 has a triangular pyramid frustum shape. When the needle tube holder 400 is connected to the core holder 300, the tip of the triangular pyramid-shaped core 100 and the distal end of the needle tube 200 of the triangular pyramid-shaped frustum form a triangular pyramid-shaped needle tip structure of the seed implantation puncture needle in combination.

Preferably, for each side of the triangular pyramid, the included angle formed between the side and a plane passing through the bottom side of the side and perpendicular to the bottom surface of the triangular pyramid is 18 °. Through tests, the average puncture force of the triangular pyramid-shaped needle tip structure is 2.10N.

In some embodiments, as shown in fig. 2, the interior cavity includes a guide section 411, the guide section 411 being conical and communicating with the needle cannula 200, the guide section 411 decreasing in diameter from the insertion port 420 toward the needle cannula 200 for guiding the radioactive seeds placed through the insertion port 420 into the needle cannula 200. Specifically, guide section 411 is in direct communication with needle cannula 200, and the diameter of the small diameter end of guide section 411 is the same as the diameter of the interior cavity of needle cannula 200.

Preferably, the cone angle of the guide section 411 is 13 °, which angle is more convenient for the introduction of seeds.

Specifically, as shown in fig. 1, the outer wall surface of the needle tube 200 is provided with a developing mark 800 every 10mm, and the particle implantation process can be clearly observed in real time by CT or ultrasound.

Further, as shown in fig. 1 and 2, the seed implantation puncture needle further comprises a cursor 700, and the cursor 700 is slidably sleeved on the outer side wall of the needle tube 200. In use, after penetration into place, cursor 700 is moved to position the seed implantation needle to prevent movement of the seed implantation needle.

Fig. 9 is an exploded view showing a conventional structure of a connection between a needle holder and a core holder in a seed-implanting puncture needle. As shown in fig. 9, the connection structure between the needle holder and the needle core holder includes an elastic clamping member disposed at the proximal end of the needle core holder 300, and a circular bump disposed on the outer sidewall of the needle tube holder 400, and an arc-shaped groove adapted to the circular bump is disposed on the elastic clamping member of the needle core holder 300. When the needle tube seat is connected with the needle core seat, the round protruding point is positioned in the arc-shaped groove. Because the contact area of circular bump and arc recess joint is little, there is the risk of card not tight.

In some embodiments, as shown in fig. 2, 10 and 11, the proximal end of the needle core holder 300 is provided with an elastic clamping member 310, and the proximal end of the elastic clamping member 310 is provided with an elastic clamping hook 311. The side wall of the needle tube holder 400 is provided with a channel 440 for the elastic clamping piece 310 to pass through and a positioning groove 430 positioned at the proximal end of the channel 440, and the positioning groove 430 is used for clamping the elastic clamping hook 311 of the elastic clamping piece 310 when the distal end of the needle core 100 extends to the puncture position outside the needle tube 200 so as to realize the fixed connection between the needle tube holder 400 and the needle core holder 300 and the circumferential positioning between the needle tube holder and the needle core holder 300. Specifically, the positioning groove 430 is close to the groove wall at one side of the insertion port 420 to axially limit the elastic hook 311. The fixedly connected needle tube holder 400 and the needle core holder 300 facilitate penetration. When the user moves the core holder 300 away from the needle tube 200, the elastic hook 311 of the elastic clip 310 slides out of the positioning groove 430, so that the needle tube holder 400 is separated from the core holder 300, and the core 100 can be withdrawn from the insertion port 420 for inserting the radioactive particles.

Compared with the prior needle tube seat and the needle core seat which are clamped by using the circular convex points and the arc-shaped grooves, the application has larger contact area by using the elastic clamping hooks 311 and the positioning grooves 430, is convenient for plugging and pulling out, and can ensure stable connection.

Specifically, as shown in fig. 2, 10 and 11, the proximal end of the needle cannula holder 400 is provided with an annular stop boss 450, and the needle cartridge 300 includes an annular cavity 320 adapted to the stop boss 450.

As shown in fig. 10, when the distal end of the core 100 is inserted into the needle tube 200 through the insertion port 420 through the one-way membrane 500 and protrudes to the penetration position outside the needle tube 200, the stopper boss 450 is inserted into the annular cavity 320 for radially stopping the core holder 300.

The utility model provides a thought and a method for implanting seeds into a puncture needle, and the method and the way for realizing the technical scheme are numerous, the above description is only a preferred embodiment of the utility model, and it should be pointed out that a plurality of improvements and modifications can be made to the person skilled in the art without departing from the principle of the utility model, and the improvements and the modifications are also regarded as the protection scope of the utility model. The components not explicitly described in this embodiment can be implemented by using the prior art.

Claims (10)

1. A seed implantation puncture needle, which is characterized by comprising a needle core (100), a needle tube (200), a needle core seat (300) and a needle tube seat (400); the proximal end of the needle core (100) is fixedly connected with the needle core seat (300); the needle tube seat (400) comprises an inner cavity and an insertion port (420) communicated with the inner cavity, and the insertion port (420) is positioned at the proximal end of the needle tube seat (400); the proximal end of the needle tube (200) is fixedly connected with the needle tube seat (400) and is communicated with the inner cavity; the inner cavity is provided with a one-way film (500), and the distal end of the needle core (100) can be inserted into the needle tube (200) through the insertion port (420) through the one-way film (500) and extend to a puncture position outside the needle tube (200); when the distal end of the needle core (100) extends to a puncture position outside the needle tube (200), the needle tube seat (400) and the needle core seat (300) are connected in a releasable manner.

2. The seed implantation needle of claim 1, wherein said unidirectional membrane (500) is provided with four flaps.

3. The seed-implanted needle of claim 1, wherein the distal end of the needle core (100) and the distal end of the needle cannula (200) combine to form a needle tip structure when the distal end of the needle core (100) extends to a penetration position beyond the needle cannula (200).

4. A seed implantation puncture needle according to claim 3, characterized in that the tip of the needle core (100) is triangular pyramid-shaped, and the distal end of the needle tube (200) is triangular pyramid-shaped; when the distal end of the needle core (100) extends to a puncture position outside the needle tube (200), the tip of the triangular pyramid-shaped needle core (100) and the distal end of the needle tube (200) are combined to form a triangular pyramid-shaped needle tip structure.

5. The seed-implantation needle of claim 4, wherein for each side of the triangular pyramid, the included angle formed between the side and a plane passing through the bottom side of the side and perpendicular to the bottom side of the triangular pyramid is 18 °.

6. The seed implantation needle of claim 1, wherein the lumen comprises a guide section, the guide section being conical and communicating with the needle cannula (200), the guide section decreasing in diameter from the insertion port (420) toward the needle cannula (200) for introducing radioactive seeds placed through the insertion port (420) into the needle cannula (200).

7. The seed-implanted needle of claim 6 wherein the conical angle of the pilot segment is 13 °.

8. The seed implantation puncture needle according to claim 1, wherein an elastic clamping piece (310) is arranged at the proximal end of the needle core seat (300), and an elastic clamping hook (311) is arranged at the proximal end of the elastic clamping piece (310); the side wall of the needle tube seat (400) is provided with a channel (440) for the elastic clamping piece (310) to pass through and a positioning groove (430) positioned at the proximal end of the channel (440), and the positioning groove (430) is used for clamping the elastic clamping hook (311) of the elastic clamping piece (310) when the distal end of the needle core (100) extends out of the needle tube (200) to a puncture position; when a user moves the needle core holder (300) away from the needle tube (200), the elastic hook (311) of the elastic clamping piece (310) slides out of the positioning groove (430).

9. The seed-implanted needle of any of claims 1 to 8, further comprising one or more development marks disposed at axially spaced intervals on the outer wall surface of the needle cannula (200).

10. The seed implantation needle of any one of claims 1 to 8, further comprising a cursor (700), said cursor (700) slidably engaging over the outer sidewall of said needle cannula (200).