CN216570152U - Ovum fetching needle - Google Patents

Abstract

The application relates to an ovum taking needle, which comprises a needle tube, a handle, a needle core and a tail cover, wherein the needle tube is provided with a hollow tube cavity, the head end of the needle tube is provided with a needle tube blade face, the handle is provided with a first inner hole for installing the needle tube, a second inner hole communicated with the first inner hole in the same direction and communicated to the tail end of the handle, and a third inner hole communicated with the first inner hole and extended to the outer side of the handle along the direction forming an included angle with the extending direction of the first inner hole; the needle core comprises a core body and a limiting head, the head end of the core body is provided with a needle body blade surface in the same direction as the needle tube blade surface, the needle core is inserted into the needle tube through a second inner hole or a third inner hole, and the alignment of the core body blade surface and the needle tube blade surface is ensured through a limiting structure between the limiting head and the handle; the tail cover blocks the second inner hole or the third inner hole after the needle core is taken out. This get ovum needle can avoid normal tissue to get into the needle tubing when the puncture, takes out the nook closing member and adorns the tail-hood and can realize the ovum collection again, has promoted the probability of getting the ovum operation success when convenient operation.

Description

Ovum fetching needle

Technical Field

The present application relates to medical aids, and more particularly, to an aspiration needle for collecting mature oocytes under ultrasound guidance.

Background

In recent years, the number of people who are not pregnant is increasing due to the acceleration of work pace and the increasing of work competition pressure, and under the combined influence of various other factors and the reasons of patients. The pregnancy is carried out in a clinical artificial assistance mode, and the method becomes an effective medical means. The method is simple, convenient, visual and safe, can accurately collect each follicle, and greatly improves the ovum collection efficiency. The design scheme and the processing technology of the ovum taking needle directly determine whether the follicle collection can be successful.

In the process of follicle collection, firstly, under the guidance of an ultrasonic intracavity probe, the pelvic cavity needs to be thoroughly scanned, and the position of the uterus, the shape of the endometrium, the position of the ovary and the number of follicles to be aspirated are known. And secondly, after the position of the punctured follicle is determined, the ovum taking needle respectively passes through a guide groove of the puncture stent, the vaginal wall, the peritoneum, the ovary and the follicle by the guide of the puncture stent in the ultrasonic probe cavity. In the process, most of the egg taking needles are of a hollow structure at present, and in the puncturing process, normal tissues of a human body can enter a hollow tube cavity of the egg taking needle, so that the separation of eggs and the normal tissues can be difficult due to the fact that the normal tissues are extracted into a test tube in the follow-up follicle aspiration process, and in a more serious case, the hollow tube cavity of the egg taking needle can be blocked, and finally, the egg taking failure can be caused.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will solve lies in, to prior art's above-mentioned defect, provides one kind and can avoid human normal tissue to get into the needle way and cause to get the ovum needle of getting unsmooth or failure getting the ovum in the ovum process.

The technical scheme adopted by the application for solving the technical problem is as follows: the utility model provides an ovum needle of getting, includes needle tubing, handle, nook closing member and tail-hood, wherein: the needle tube is provided with a hollow tube cavity which is communicated with the head and the tail, and the head end of the needle tube is provided with a needle tube blade surface; the handle is provided with a first inner hole, a second inner hole and a third inner hole, wherein the first inner hole extends from the head end of the handle to the tail end of the handle and is used for mounting a needle tube, the second inner hole is communicated with the first inner hole in the same direction and penetrates to the tail end of the handle, the third inner hole is communicated with the first inner hole and extends to penetrate to the outer side of the handle along the direction forming an included angle with the extending direction of the first inner hole, and the tail end of the needle tube is fixedly arranged in the first inner hole; the needle core is used for being inserted into a tube cavity of a needle tube from one of the second inner hole and the third inner hole to block the needle tube blade surface, the needle core comprises a core body and a limiting head connected to the tail end of the core body, the head end of the core body is provided with a core body blade surface with the same direction as the needle tube blade surface, and a limiting structure which is used for inserting the core body into the tube cavity of the needle tube to enable the core body blade surface to be aligned with the needle tube blade surface is arranged between the limiting head and the one of the second inner hole and the third inner hole; the tail cap is used for being detachably connected with one of the second inner hole and the third inner hole after the needle core is taken out of the one of the second inner hole and the third inner hole so as to block the one of the second inner hole and the third inner hole, so that a collecting channel is formed by the needle tube and the other one of the second inner hole and the third inner hole.

In one embodiment of the ovum taking needle, the core body of the needle core is a hard metal core body and is used for plugging the needle tube blade face by inserting the lumen of the needle tube into the second inner hole; or the core body of the needle core is a soft plastic core body and is used for plugging the needle tube blade face by inserting the tube cavity of the needle tube from the second inner hole or the third inner hole.

In one embodiment of the ovum pick-up needle according to the application, the limit structure comprises a first limit groove which is arranged at the tail end of the second inner hole or the third inner hole along the side wall of the second inner hole or the third inner hole and extends to the head end along the axial direction of the second inner hole or the third inner hole, and an arc-shaped second limit groove which is arranged at the head end of the first limit groove and extends along the circumferential direction of the second inner hole or the third inner hole, the limiting structure also comprises a convex block which is arranged on the limiting head and is matched with the first limiting groove and the second limiting groove, when the convex block of the limiting head is opposite to the first limiting groove, is inserted into the head end of the first limiting groove and then rotates to the other side of the second limiting groove along the second limiting groove, the limiting head is clamped in the second inner hole or the third inner hole, and the edge face of the core body is aligned with the edge face of the needle tube.

According to this application in an embodiment of ovum needle, spacing head have with second hole or the consistent spacing head main part of third hole shape, the protruding locating of lug spacing head main part's the outside, the tail end of spacing head main part still is equipped with the handheld portion of conveniently taking and pinching.

In one embodiment of the ovum taking needle, the tail cover has the same shape as the limiting head so as to be clamped in the second inner hole or the third inner hole of the handle.

According to the application, in one embodiment of the ovum taking needle, the tail cover is provided with a plunger which is consistent with the shape of the second inner hole or the third inner hole and a cover which is formed at the tail end of the plunger, and the cover is in threaded connection or buckled connection with the tail end of the second inner hole or the third inner hole of the handle.

According to one embodiment of the ovum taking needle, the tail end of the needle tube is arranged at one side, close to the tail end of the handle, of the communication part of the first inner hole and the third inner hole in the first inner hole, and the needle tube is provided with a through hole for communicating the third inner hole with the tube cavity of the needle tube at the communication part of the first inner hole and the third inner hole; or the tail end of the needle tube is arranged on one side, away from the tail end of the handle, of the communication position of the first inner hole and the third inner hole in the first inner hole.

In one embodiment of the ovum taking needle, the core body of the needle core is a solid needle body; or the core body of the needle core is provided with a hollow small hole or at least one small groove which is axially communicated around the periphery.

In one embodiment of the ovum taking needle, the outer side of the handle is provided with a mark for indicating the direction of the needle tube blade surface of the needle tube.

In one embodiment of the ovum taking needle, the handle is provided with a connecting pipe which obliquely extends from the outer side of the handle, and the third inner hole is formed in the connecting pipe.

The implementation of the ovum taking needle has the following beneficial effects: according to this application embodiment get the ovum needle through place a nook closing member in advance in the needle tubing, block up the lumen of needle tubing, get the ovum needle puncture in-process, human tissue can not enter into the needle tubing, get the ovum needle and arrive the operation target position after, take away the nook closing member from getting the ovum needle in, then block up the passageway of inserting the nook closing member in the handle with the tail-hood, the ovum cell gets into the suction catheter and then gets into the ovum cell collection test tube from gathering the passageway through the lumen of needle tubing during getting the ovum, ensure that the puncture is got the ovum and is operated and go on smoothly. Thereby get the ovum needle and avoided normal tissue to get into the needle tubing and lead to getting the ovum smooth or the problem of failure according to this application embodiment, both guaranteed medical personnel convenient operation, promoted the successful probability of ovum operation simultaneously again.

Drawings

The present application will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic structural view of an egg taking needle according to a first embodiment of the present application in a use state;

FIG. 2 is an exploded view of the ovum pick-up needle according to the first embodiment of the present application;

FIG. 3 is a sectional view of the structure of the ovum-taking needle according to the first embodiment of the present application in the state of being inserted into the core;

FIG. 4 is a sectional view of the ovum-taking needle according to the first embodiment of the present application in a state where the core is removed and the tail cap is attached;

FIG. 5 is a schematic structural view of a needle core mounted in a handle of the ovum taking needle according to the first embodiment of the present application;

FIG. 6 is a cross-sectional view of the handle of FIG. 5 with the hub installed;

FIG. 7 is a sectional view of the ovum-taking needle according to the second embodiment of the present application in a state where the core is removed and the tail cap is attached;

FIG. 8 is an exploded view of the ovum pick-up needle according to the third embodiment of the present application;

FIG. 9 is a schematic structural view of a tail cover mounted in a handle of an ovum taking needle according to a third embodiment of the application;

FIG. 10 is a sectional view of the structure of an ovum-retrieval needle according to the fourth embodiment of the present application in a state where the ovum-retrieval needle is inserted into a core;

FIG. 11 is a sectional view of the ovum-retrieval needle according to the fourth embodiment of the present application in a state where the core is removed and the tail cap is attached.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. Also, the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Fig. 1 to 4 are schematic structural views of an ovum pickup needle 10 according to a first embodiment of the present application in different states. Referring first to fig. 1 and 2, an ovum-taking needle 10 according to the first embodiment of the present application is mainly composed of a needle tube 11, a handle 12, a core 13 and a tail cap 14. The needle tube 11 has a hollow lumen 111 running through from head to tail, the head end of the needle tube 11 forms a needle blade surface 112, and the needle tube 11 is provided with a through hole 113 running through the lumen 111 at a position near the tail end. The stylet 13 comprises a solid hard metal core 131 and a limiting head 132 connected to the tail end of the core 131, the core 131 has a shape matched with the lumen 111 of the needle tube 11, and the head end of the core 131 has a core blade surface 1311 in the same direction with the needle tube blade surface 112. During the puncture process of the ovum taking needle 10, the needle core 13 is inserted into the needle tube 11 from the tail end of the handle 12 in advance to block the lumen 111 of the needle tube 11, so that the human tissue can not enter the needle tube. After the ovum-taking needle 10 reaches the position of the operation target, the needle core 13 is drawn away, and the tail end of the handle 12 is blocked by the tail cover 14. When taking eggs, the connecting tube 122 of the handle 12 is connected to the suction catheter 2, the suction catheter 2 passes through the silica gel plug 3 and is connected to the egg cell collection test tube 7, and simultaneously, the vacuum catheter 5 with the conical joint 6 also passes through the silica gel plug 3 and is connected to the egg cell collection test tube 7. When the conical joint 6 is connected with a negative pressure device to work, the egg cells enter the suction catheter 2 from a channel formed by the needle tube 11 and the connecting tube 122 and then enter the egg cell collecting test tube 4, and smooth collection is realized.

As shown in fig. 2 and 3, the handle 12 has a first bore 121, a second bore 125, and a third bore 124. A first bore 121 extends from the head end of the handle to the tail end of the handle for fixedly mounting the needle cannula 11. The second bore 125 is connected to the end of the first bore 121, and is communicated with the first bore 121 in the same direction and extends to the end of the handle 12 for inserting the stylet 13. The third bore 124 is formed in the connection tube 122 extending obliquely from the outside of the handle 12, forms an angle with the extending direction of the first bore 121, and communicates with the first bore 121 at the intersection. Referring to fig. 3, the core 131 of the needle core 13 is inserted into the lumen 111 of the needle tube 11 through the second bore 125 from the rear end of the handle 12 until the core blade 1311 is aligned with the needle blade 112, and the solid core 131 blocks the needle tube 11 to prevent human tissue from entering the needle tube 11 during puncturing. Meanwhile, a matched limit structure is arranged between the limit head 132 of the needle core 13 and the tail end of the handle 12, and is used for aligning the core blade surface 1311 with the needle tube blade surface 112 when the core 131 is inserted into the tube cavity 111 of the needle tube 11, preventing the needle core 13 from falling out of the handle 12 and releasing the limit when the needle core 13 needs to be drawn out. Referring to fig. 5 and 6, the handle 12 has a first limiting groove 126 formed at the tail end along the sidewall of the second inner hole 125 and extending toward the head end along the axial direction of the second inner hole 125, and an arc-shaped second limiting groove 127 formed at the head end of the first limiting groove 126 and extending along the circumferential direction of the second inner hole 125, wherein the second limiting groove 127 can penetrate to the outer side of the handle 12. The limiting head 132 of the stylet 13 is provided with a limiting head main body 1321 which is consistent with the shape of the second inner hole 125, a convex block 1323 which is matched with the first limiting groove 126 and the second limiting groove 127 is convexly arranged on the outer side of the limiting head main body 1321, and a handheld part 1322 is further arranged at the tail end of the limiting head main body 1321 for facilitating holding and pinching. When the needle core 13 is inserted into the ovum-taking needle 10, the bump 1323 of the limiting head 132 is rightly opposite to the first limiting groove 126 on the handle 12 and is downwards inserted into the head end of the first limiting groove 126 so as to enter the second limiting groove 127, then when the limiting head rotates to the other side of the second limiting groove 127 along the second limiting groove 127, the limiting head 132 is blocked in the second inner hole 125 of the handle 12 by the bump 1323 and the second limiting groove 127 in an abutting mode and cannot retreat, and meanwhile, the core blade surface 1311 of the core 131 just rotates to be aligned with the needle tube blade surface 112, so that the lumen 111 of the needle tube 11 is completely blocked. Furthermore, a convex strip 128 aligned with the needle cannula blade surface 112 of the needle cannula 11 is convexly arranged on the outer side of the handle 12 and used as a mark for indicating the direction of the needle cannula blade surface 112, so that the operation and the use are convenient. When the stylet 13 needs to be withdrawn, the holding part 1322 holding the stopper 132 is rotated reversely to return the projection 1323 to the head end of the first stopper groove 126 along the second stopper groove 127, and then the projection 1323 is withdrawn along the first stopper groove 126, so that the stylet 13 can be withdrawn backward.

Other suitable forms of retention structures between the retaining head 132 of the core and the trailing end of the handle may be used to achieve alignment of the core facet with the needle cannula facet in accordance with further various embodiments of the present application. For example, the tail end of the handle may be provided with a sliding groove extending axially along the side wall of the second inner hole, and the limiting head of the needle core is provided with a limiting boss engaged with the sliding groove, and the core body blade surface may be aligned with the needle tube blade surface by inserting the limiting boss into the sliding groove. Then, the tail cover is connected with the tail end of the handle, so that the limit head of the stylet can be pressed to limit the stylet to retreat, and the function of preventing the stylet from being separated is also realized.

After the stylet 13 is withdrawn, the tail cap 14 is attached to the trailing end of the handle 12 to block the second bore 125. As shown in fig. 2 and 4, tail cap 14 has a plunger 141 conforming in shape to second bore 125 and a cap 142 formed at the rear end of plunger 141. The plunger 141 is plugged into the second bore 125, and the cap 142 has internal threads 143 for threadedly engaging with the external threads 123 provided at the rear end of the handle 12. The cap 142 may be removably connected to the rear end of the handle 12 by any of a variety of other suitable means known in the art, such as by a luer fitting commonly used in the medical field, and by any of a variety of snap structures, according to various embodiments of the present application. As further shown in fig. 4, since the tail end of the needle tube 11 extends to the connection between the first bore 121 and the second bore 125, that is, to the side of the connection between the first bore 121 and the third bore 124 near the tail end of the handle, the through hole 113 of the needle tube 11 is opened opposite to the connection between the first bore 121 and the third bore 124, so as to connect the third bore 124 with the lumen 111 of the needle tube 11, thereby forming an egg taking channel, and further sucking the collected egg cells into the egg cell collecting test tube 4 through the suction catheter 2 inserted into the third bore 124.

According to the ovum taking needle 10 of the above embodiment of the application, the needle core 13 is placed in the needle tube 11 in advance, the lumen 111 of the needle tube 11 is blocked, the core body 131 is in a solid state, in the puncturing process of the ovum taking needle 10, human tissues can not enter the needle tube 11, after the ovum taking needle 10 reaches the position of an operation target, the needle core 13 is drawn out from the ovum taking needle 10, then the tail cover 14 is used for blocking the second inner hole 125 at the tail end of the ovum taking needle, ovum cells enter the suction catheter 2 from the channel formed by the needle tube 11 and the third inner hole 124 during ovum taking and then enter the ovum cell collection test tube 4, and smooth operation of puncturing and ovum taking is ensured.

Fig. 7 shows a structural cross-sectional view of the ovum-taking needle 20 according to the second embodiment of the present application in a state that the tail cap 24 is mounted after the core is taken out. The ovum retrieval needle 20 according to the second embodiment of the present application has substantially the same structure as the ovum retrieval needle 10 of the first embodiment shown in fig. 1-6, and is also composed of a needle tube 21, a handle 22, a needle core (not shown) and a tail cap 24, and is different only in that the tail end of the needle tube 21 is arranged at the side of the communicating part of the first inner hole 221 and the third inner hole 224 in the first inner hole 221, which is far away from the tail end of the handle, and the lumen 211 of the needle tube 21 is in the communicating state with the third inner hole 224 of the handle 22 after the needle core 23 is drawn out, so that a through hole does not need to be opened on the needle tube 21.

Fig. 8 is an exploded view of the ovum-retrieval needle 30 according to the third embodiment of the present application. As shown in FIG. 8, the ovum taking needle 30 according to the third embodiment of the present application has a structure similar to that of the ovum taking needle 10 of the first embodiment shown in FIGS. 1 to 6, and also comprises a needle tube 31, a handle 32, a needle core 33 and a tail cap 35, wherein the needle tube 31, the handle 32 and the needle core 33 are basically the same as the needle tube 11, the handle 12 and the needle core 13 of the ovum taking needle 10 of the first embodiment, and thus, the detailed description thereof is omitted. The ovum taking needle 30 of the third embodiment is different in that the tail cap 35 has the same shape as the aforementioned limiting head 132 and is connected with the tail end of the handle 12 through the same limiting structure as the limiting head 132. Specifically, as shown in fig. 9, the handle 32 has a first limiting groove 326 extending along the axial direction of the second inner hole 325 toward the head end along the sidewall of the second inner hole 325 at the tail end thereof, and an arc-shaped second limiting groove 327 extending along the circumferential direction of the second inner hole 325 at the head end of the first limiting groove 326, wherein the second limiting groove 327 may penetrate to the outer side of the handle 32. The tail cover 35 is provided with a plunger 351 which is consistent with the shape of the second inner hole 325, a convex block 353 which is matched with the first limiting groove 326 and the second limiting groove 327 is convexly arranged on the outer side of the plunger 351, and a handheld part 352 is further arranged at the tail end of the plunger 351 for facilitating holding. The bump 353 of the tail cover 35 is directly opposite to the first limit groove 326 on the handle 32 and is inserted downwards to the head end of the first limit groove 326 so as to enter the second limit groove 327, then when the tail cover 35 rotates to the other side of the second limit groove 327 along the second limit groove 327, the tail cover 35 is blocked in the second inner hole 325 of the handle 32 through the bump 353 and the second limit groove 327 in a propping mode and cannot retreat and escape, and meanwhile, the plunger 351 blocks the second inner hole 325. When the tail cap 35 needs to be removed, the handle portion 352 of the tail cap 35 is held and rotated in the reverse direction, so that the projection 353 returns to the head end of the first limiting groove 326 along the second limiting groove 327, and then the projection 353 is withdrawn along the first limiting groove 326, so that the tail cap 35 can be removed.

Fig. 10 and 11 are sectional views showing the structure of an ovum-taking needle 40 according to the fourth embodiment of the present application in the state of loading a core and in the state of removing the core-mounted tail cap, respectively. As shown in fig. 10 and 11, an ovum-taking needle 40 according to a fourth embodiment of the present application has a structure similar to that of the ovum-taking needle 10 of the first embodiment shown in fig. 1 to 6, and is also composed of a needle tube 41, a handle 42, a needle core 43 and a tail cover 44, and the main difference is that a core 431 of the needle core 43 is a soft plastic core (for example, a plastic guide wire), and is inserted into a lumen 441 of the needle tube 41 through a third inner hole 424 obliquely arranged in the handle 42 to block a needle blade face. After the needle core 43 is removed, the tail cap 44 blocks the third inner hole 424, and the ovum-taking needle 40 collects the ovum through the collecting channel formed by the needle tube 41.

As shown in fig. 10 and 11, in the ovum pick-up needle 40 according to the fourth embodiment of the present application, the first inner hole and the second inner hole which are provided in the handle in the previous embodiment by sections are designed to be a first inner hole 421 which penetrates through the head and the tail of the handle 42, and a third inner hole 424 is provided to communicate with the first inner hole 421, and the third inner hole 424 extends through the handle 42 in a direction which forms an included angle with the extending direction of the first inner hole 421. The needle tube 41 is inserted into the first bore 421 and the rear end of the needle tube 41 extends from the rear end of the handle 42 for connecting the suction catheter 2. The stylet 43 comprises a solid, flexible plastic core 431 and a stop 432 attached to the trailing end of the core 431. Because the core 431 of the needle core 43 is soft and flexible, the core 431 of the needle core 43 is inserted into the lumen 411 of the needle tube 41 from the third inner hole 424 of the handle 42 through the through hole 413 which is formed on the needle tube 41 and is communicated with the third inner hole 424 until the blade face of the core is aligned with the blade face of the needle tube, the core 431 blocks the needle tube 41, and human tissues are prevented from entering the needle tube 41 during puncture. Meanwhile, a matched limit structure is also arranged between the limit head 432 of the needle core 43 and the tail end of the third inner hole 424, and is used for aligning the core body blade face with the needle tube blade face when the core body 431 is inserted into the tube cavity 411 of the needle tube 41, preventing the needle core 43 from falling out of the handle 42 and releasing the limit when the needle core 43 needs to be drawn out. The specific implementation manner of the limiting structure may be the same as that of the limiting structure arranged between the limiting head 132 of the stylet 13 and the tail end of the handle 12 in the ovum taking needle 10 of the first embodiment, and details are not repeated. After the needle core 43 is withdrawn, as shown in fig. 11, the tail cap 44 is connected to the tail end of the third inner hole 424, and the plunger 441 of the tail cap 44 blocks the third inner hole 424, so that an egg taking channel (shown by an arrow in fig. 11) is formed through the lumen 411 of the needle tube 41, and the collected egg cells are sucked into the egg cell collecting tube through the suction tube 2 connected to the tail end of the needle tube 41. The tail cap 44 may be mounted in the same manner as the tail cap 14 of the ovum-taking needle 10 of the first embodiment, or may be detachably mounted by various other suitable means.

Furthermore, the core of the stylet may also not be of a solid design, according to various embodiments of the present application. For example, the core body can be provided with a hollow small hole or a plurality of axially-through small grooves formed around the periphery of the core body and used for being communicated with the atmosphere, only the cutting tissue is not easy to enter the small hole or the small groove in the needle tube puncture process, and the design can further prevent the needle core from forming negative pressure when being drawn out to cause unpredictable blood drawing inside or follicle drawing in advance to enter the needle tube.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. The utility model provides an ovum needle, its characterized in that includes needle tubing, handle, nook closing member and tail-hood, wherein:

the needle tube is provided with a hollow tube cavity which is communicated with the head and the tail, and the head end of the needle tube is provided with a needle tube blade surface;

the handle is provided with a first inner hole, a second inner hole and a third inner hole, wherein the first inner hole extends from the head end of the handle to the tail end of the handle and is used for mounting a needle tube, the second inner hole is communicated with the first inner hole in the same direction and penetrates to the tail end of the handle, the third inner hole is communicated with the first inner hole and extends to penetrate to the outer side of the handle along the direction forming an included angle with the extending direction of the first inner hole, and the tail end of the needle tube is fixedly arranged in the first inner hole;

the needle core is used for being inserted into a tube cavity of a needle tube from one of the second inner hole and the third inner hole to block the needle tube blade surface, the needle core comprises a core body and a limiting head connected to the tail end of the core body, the head end of the core body is provided with a core body blade surface with the same direction as the needle tube blade surface, and a limiting structure which is used for inserting the core body into the tube cavity of the needle tube to enable the core body blade surface to be aligned with the needle tube blade surface is arranged between the limiting head and the one of the second inner hole and the third inner hole;

the tail cap is used for being detachably connected with one of the second inner hole and the third inner hole after the needle core is taken out of the one of the second inner hole and the third inner hole so as to block the one of the second inner hole and the third inner hole, so that a collecting channel is formed by the needle tube and the other one of the second inner hole and the third inner hole.

2. The ovum pick-up needle according to claim 1, wherein the core body of the needle core is a hard metal core body and is used for plugging the needle tube blade face by inserting the lumen of the needle tube from the second inner hole; or the core body of the needle core is a soft plastic core body and is used for plugging the needle tube blade face by inserting the tube cavity of the needle tube from the second inner hole or the third inner hole.

3. The ovum pick-up needle as claimed in claim 1, wherein the limiting structure comprises a first limiting groove provided at the tail end of the second inner hole or the third inner hole along the side wall of the second inner hole or the third inner hole and extending along the axial direction of the second inner hole or the third inner hole to the head end, and an arc-shaped second limiting groove provided at the head end of the first limiting groove and extending along the circumferential direction of the second inner hole or the third inner hole, the limiting structure also comprises a convex block which is arranged on the limiting head and is matched with the first limiting groove and the second limiting groove, when the convex block of the limiting head is opposite to the first limiting groove, is inserted into the head end of the first limiting groove and then rotates to the other side of the second limiting groove along the second limiting groove, the limiting head is clamped in the second inner hole or the third inner hole, and the edge face of the core body is aligned with the edge face of the needle tube.

4. The ovum pick-up needle as claimed in claim 3, wherein the limiting head is provided with a limiting head main body which is in accordance with the shape of the second inner hole or the third inner hole, the convex block is convexly arranged at the outer side of the limiting head main body, and the tail end of the limiting head main body is also provided with a hand-held part which is convenient to hold.

5. The aspiration needle of claim 3 or 4, wherein the tail cap has the same shape as the stopper so as to be snapped into the second or third inner hole of the handle.

6. The ovum pick-up needle as claimed in claim 1, wherein the tail cover is provided with a plunger which is consistent with the shape of the second inner hole or the third inner hole and a cover which is formed at the tail end of the plunger and is in threaded connection or snap connection with the tail end of the second inner hole or the third inner hole of the handle.

7. The ovum taking needle as claimed in claim 1, wherein the tail end of the needle tube is arranged at one side of the communication part of the first inner hole and the third inner hole in the first inner hole, which is close to the tail end of the handle, and the needle tube is provided with a through hole at the communication part of the first inner hole and the third inner hole, which is used for communicating the third inner hole with the tube cavity of the needle tube; or the tail end of the needle tube is arranged on one side, away from the tail end of the handle, of the communication position of the first inner hole and the third inner hole in the first inner hole.

8. The ovum pick needle as claimed in claim 1, wherein the core body of the needle core is a solid needle body; or the core body of the needle core is provided with a hollow small hole or at least one small groove which is axially communicated around the periphery.

9. The ovum pick-up needle as claimed in claim 1, wherein the outside of the handle is provided with a mark for indicating the direction of the needle tube blade surface of the needle tube.

10. The ovum pick-up needle as claimed in claim 1, wherein the handle is provided with a connection tube extending obliquely from an outer side of the handle, and the third inner hole is formed in the connection tube.

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