CN221535389U

CN221535389U - Uterine cavity injection device

Info

Publication number: CN221535389U
Application number: CN202323245438.XU
Authority: CN
Inventors: 段立艳; 孙海翔; 张慧
Original assignee: Nanjing Drum Tower Hospital
Current assignee: Nanjing Drum Tower Hospital
Priority date: 2023-11-30
Filing date: 2023-11-30
Publication date: 2024-08-16
Anticipated expiration: 2033-11-30

Abstract

The utility model discloses a uterine cavity injection device, which relates to the technical field of injection devices and comprises an injection needle, an outer sleeve, a fixed handle, a push rod, an adjusting handle and a liquid medicine injection body; one end of the fixed handle is fixed on the outer sleeve; one end of the pushing rod is connected with the injection needle, the other end is connected with the adjusting handle; the utility model is mainly used for realizing injection of liquid medicine in the endometrium, the injection needle is hidden in the outer sleeve tube when being placed by adjusting the relative position between the fixed handle and the adjusting handle, the protection effect is realized, when the endometrium needs to be injected, the adjusting handle is pushed forward, the relative position between the adjusting handle and the fixed handle is controlled, the injection needle extends out of the outer sleeve tube after entering the endometrium, the injection of the endometrium is realized, and simultaneously, the injection to the front, the back and the side wall of the uterus in the endometrium is realized through rotating operation, so that the injection blind area is avoided.

Description

Uterine cavity injection device

Technical Field

The utility model belongs to the technical field of injection devices, and particularly relates to a uterine cavity injection device.

Background

The etiology of thin endometrium is considered to be related to repeated uterine cavity operation, infection, endometrial blood supply insufficiency after uterine artery embolism, continuous oral contraceptive, application of clomiphene for ovulation promotion and the like in most researches at present. In recent years, the research shows that stem cells and PRP can promote the growth and repair of damaged tissues due to the high concentration of cooperative growth factors, and the novel technology of thin type endometrium treatment is realized. Clinically, stem cell or cytokine PRP therapy has relied on hysteroscopic guidance to inject some specific cytokines under the endometrium. However, the existing injection needle has the defects that the injection cannot be performed to the front, the back and the side walls of the uterus in the uterine cavity through the cervix, and the injection depth cannot be controlled, so that the perforation of the uterus can be caused by too deep injection, and the injection of the medicine into the endometrium can not be ensured due to too shallow injection, but only into the surface of the endometrium and the uterine cavity. This wastes growth factors and is detrimental to subsequent work.

Chinese patent document CN204293670U, filing date 2015-04-29, patent name: the uterine cavity injection needle provides a solution that a needle rod and the needle are approximately right-angle, the depth of injection liquid medicine on the uterine wall (the joint of an endometrium and a muscular layer) is controlled by the bent length of the needle, and the direction of the needle is adjusted by rotating a needle cylinder to inject different positions of the uterus. When the uterine drug injection is actually performed, the hysteroscope is often used for monitoring; to facilitate the smooth operation, a uterine lavage fluid is usually injected into the uterus. The technology controls the depth of the injection liquid medicine on the uterine wall by setting the bending length of the needle, so the bending length of the needle cannot be too long, and the injection scheme for different positions of the uterus cannot be obviously realized by rotating the needle cylinder to adjust the direction of the needle as the uterus is already inflated.

Secondly, the human body uterine cavity has a special physiological structure, and when the instrument is placed, the physiological structures of the cervical canal and the uterine cavity are required to be considered, and the cervical orifice is very small, so that the fact that the inner wall is not damaged when the instrument is placed is considered, and excessive pressure is not applied to the cervical orifice in the injection process, so that a patient is comfortable. At present, no related technical scheme conforming to physiological structures is known.

Disclosure of utility model

The utility model aims to provide a uterine cavity injection device which can realize omnibearing injection of endometrium, accords with the design of human physiological structure, has a protection effect and has good comfort level for patients.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The uterine cavity injection device comprises an injection needle, an outer sleeve, a fixed handle, an adjusting handle and a liquid medicine injection body; the injection needle is connected with the adjusting handle through a hollow pushing rod; the injection end of the liquid medicine injection body is detachably inserted into the adjusting handle so that the liquid medicine injection body is communicated with the injection needle; the outer sleeve is sleeved outside the injection needle, the pushing rod and the adjusting handle; the end part of the outer sleeve, which is close to the adjusting handle, is connected with the fixed handle; the outer sleeve comprises a straight part and a bending part; the injection needle comprises an arc-shaped part and a linear part; the bending angle of the arc-shaped part is consistent with that of the bending part; a sliding groove is formed in the fixed handle; the adjusting handle is provided with sliding teeth matched with the sliding grooves; when the adjusting handle is pushed, the sliding teeth are extruded and deformed, so that the adjusting handle drives the injection needle to extend out of the end part of the outer sleeve pipe, which is away from the fixed handle; when the adjusting handle is rotated, the sliding teeth can rotate relative to the sliding grooves.

Optionally, the sliding teeth are a plurality of continuous annular convex structures; the sliding groove is of a plurality of continuous annular groove structures; the diameter of the annular bulge structure is smaller than the diameter of the bottom of the annular groove and larger than the diameter of the edge of the annular groove.

Optionally, the angle between the arcuate portion and the linear portion of the needle ranges from 160 ° to 176 °.

Optionally, the straight portion and the curved portion of the outer sleeve are integrally formed; the arc-shaped part and the linear part of the injection needle are integrally formed; the end part of the arc-shaped part far away from the linear part is provided with a clamping joint; the clamping connector is detachably connected with the pushing rod.

Optionally, the adjusting handle comprises an adjusting rod, a pressing piece and a connector; the sliding teeth are positioned in the circumferential direction of the adjusting rod; one end of the adjusting rod is connected with the pushing rod, and the other end of the adjusting rod is provided with a connector; two pressing sheets are symmetrically distributed on two sides of the connector.

Optionally, the fixing handle comprises a connecting pipe and a pressing ring; the sliding groove is positioned on the inner wall of the connecting pipe; two pressing rings are symmetrically distributed at the end part of the fixed handle, which is close to the liquid medicine injection body;

When the pressing ring is propped against the pressing piece, the length of the injection needle extending out of the outer sleeve meets the injection use length.

Optionally, the maximum diameter of the injection needle is 1.21mm; the extending length of the injection needle extending out of the outer sleeve is at least 6mm.

Optionally, the outer sleeve is made of medical polymer materials; the injection needle is made of a material developed under ultrasound.

Optionally, a bend adjustment traction wire is also included; one end of the bending adjustment traction wire is connected to the end part of the outer sleeve, which is close to the injection needle, the other end of the bending adjustment traction wire extends out of the fixed handle, and the extending end of the bending adjustment traction wire is connected with the traction handle.

Optionally, the inner walls of the outer sleeve and the fixed handle are provided with a passing channel capable of accommodating the bending adjustment traction wire to pass through; the end part of the passing channel, which is away from the fixed handle, is positioned at the joint of the straight part and the bending part of the outer sleeve; a through hole is arranged at the connecting line of the straight part and the bending part; the through-hole communicates with the through-passage.

The beneficial effects of the utility model are as follows:

(1) The utility model relates to a uterine cavity injection device, which is mainly used for realizing injection of liquid medicine between a uterine cavity inner membrane and a base layer, and in the structural principle, an injection needle is hidden in an outer sleeve tube when being placed by virtue of the relative position between a fixed handle and an adjusting handle, so that the inner wall is prevented from being damaged, the uterine cavity injection device has a protective effect, when the uterine cavity inner membrane is required to be injected, the adjusting handle is pushed forward, the relative position between the adjusting handle and the fixed handle is controlled, and after the injection needle enters the uterine cavity, the injection needle extends out of the outer sleeve tube, so that the injection of the uterine cavity inner membrane is realized; when the injection is completed, the adjusting handle is controlled again, so that the injection needle returns to the outer sleeve, thereby having a protection function when the injection is withdrawn, in addition, the outer sleeve and the injection needle are both designed by adopting a bending structure, the device is convenient to enter the uterine cavity through the vaginal and cervical pipelines, and realizes injection to the anterior, posterior and lateral walls of the uterus in the uterine cavity through rotation operation, thereby avoiding injection blind areas.

(2) The injection needle is arranged, and the outer sleeve is used for protecting the carrier for placing the injection needle; be provided with catch bar, fixed handle, adjustment handle, the injection needle is connected to catch bar one end, and the other end is connected with adjustment handle for can control the action of injection needle in the distal end, satisfy the injection demand, the operability is good.

(3) The regulating handle is externally connected with the liquid medicine injection body and the injection needle, the fixed handle, the pushing rod and the regulating handle are all provided with hollow channels, and the interiors of the hollow channels are communicated, so that the injection liquid medicine can be accurately injected onto the endometrium.

(4) The connecting pipe inner wall is provided with the sliding tray, and the sliding tray cooperatees with the slip tooth on the adjustment handle for adjustment handle can realize advancing and fix in the fixed handle relatively, and then can control the promotion stroke of the catch bar of connection on adjusting the pole, thereby control the position of injection needle, the injection needle control of being convenient for is in the outer tube, or outside the outer tube, thereby stable palace chamber injection of carrying out.

(5) The injection needle comprises an arc-shaped part and a linear part; the curved part of the outer sleeve of the arc part of the injection needle is consistent; the linear part of the injection needle is consistent with the straight part of the outer sleeve, and the effect of the design is that: on the one hand, the injection needle is attached to the outer sleeve, so that the injection needle is convenient to put in, and simultaneously, in an injection state, the injection needle extends out of the outer sleeve to form a certain angle relative to the outer sleeve, so that the injection is conveniently performed in the uterine cavity to the front, back and side walls of the uterus.

(6) The sliding groove is a plurality of continuous annular groove structures, the diameter of the annular protruding structure is smaller than the diameter of the bottom of the annular groove and larger than the diameter of the edge of the annular groove, namely the annular protruding structure can rotate in the annular groove, and when the adjusting handle is required to be pushed, the annular protruding is deformed, so that the injection needle is stretched out; after the injection needle stretches out required length, the annular groove can avoid the annular protrusion to pass through, so that the limiting effect is achieved, and the accuracy of the injection position is ensured.

(7) The outer sleeve is made of medical polymer materials, not only meets the hardness required by implantation, but also has certain elasticity and has buffer protection effect on the inner wall.

(8) The bending degree of the outer sleeve can be adjusted in an auxiliary mode through setting the bending adjusting traction wire, so that the outer sleeve can be smoothly transited to a uterine cavity pipeline through a vagina when being placed in the uterus cavity pipeline, and the uterus cavity pipeline is adapted to physiological structures of different patients.

Drawings

Fig. 1 is a schematic structural view of a uterine cavity injection device according to a first embodiment of the present utility model;

Fig. 2 is a schematic view showing the structure of an injection needle in an extended state in a uterine cavity injection device according to a first embodiment of the present utility model;

fig. 3 is a schematic view showing a disassembled state of an intrauterine injection device according to a first embodiment of the present utility model;

FIG. 4 is a schematic structural view of the adjustment handle;

FIG. 5 is a schematic structural view of the stationary handle;

FIG. 6 is a schematic plan view of the mating of the fixed handle and the adjustment handle;

FIG. 7 is a schematic structural view of an outer sleeve;

FIG. 8 is a schematic view of the structure of the injection needle;

Fig. 9 is a schematic view of a structure in which a bend-adjusting traction wire is provided in an outer sheath in the second embodiment.

Marked in the figure as: 1 is an injection needle, 11 is an arc-shaped part, 12 is a linear part, 13 is a clamping joint, 2 is an outer sleeve, 21 is a straight part, 22 is a bending part, 3 is a fixed handle, 31 is a connecting pipe, 32 is a pressing ring, 33 is a sliding groove, 4 is an adjusting handle, 41 is an adjusting rod, 42 is a pressing piece, 43 is a sliding tooth, 44 is a connecting head, 5 is a pushing rod, 6 is a liquid medicine injection body, 7 is a bending adjusting traction wire, and 71 is a traction handle.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

It should be noted that the terms like "upper", "lower", "left", "right", "front", "rear", and the like are also used for descriptive purposes only and are not intended to limit the scope of the utility model in which the utility model may be practiced, but rather the relative relationship of the terms may be altered or modified without materially altering the teachings of the utility model.

Example 1

As shown in fig. 1 to 3, there is provided a uterine cavity injection device comprising an injection needle 1, an outer cannula 2, a fixed handle 3, an adjusting handle 4 and a liquid medicine injection body 6; the injection needle 1 is connected with the adjusting handle 4 through a hollow pushing rod 5; the injection end of the liquid medicine injection body 6 is detachably inserted into the adjusting handle 4, so that the liquid medicine injection body 6 is communicated with the injection needle 1, namely channels are arranged among the injection needle 1, the pushing rod 5 and the adjusting handle 4, when the injection needle 1, the pushing rod 5 and the adjusting handle 4 are connected, the liquid medicine injection body 6 can inject liquid medicine into the injection needle 1 and is injected into a human body through the injection needle 1, thereby realizing the remote control of the action of the injection needle 1, meeting the injection requirement and having good operability; the outer sleeve 2 is sleeved outside the injection needle 1, the pushing rod 5 and the adjusting handle 4; the end of the outer sleeve 2 close to the adjusting handle 4 is connected with the fixed handle 3, namely the outer sleeve 2 is connected with the fixed handle 3, and is coaxially sleeved outside the injection needle 1, the pushing rod 5 and the adjusting handle 4.

A sliding groove 33 is arranged in the fixed handle 3; the adjusting handle 4 is provided with sliding teeth 43 matched with the sliding grooves 33; when the adjusting handle 4 is pushed, the sliding teeth 43 are extruded and deformed, so that the adjusting handle 4 drives the injection needle 1 to extend out of the outer sleeve 2, namely, when the injection needle 1 is placed into a human body and when the injection needle is withdrawn from the human body, the injection needle 1 is positioned in the outer sleeve 2, thereby preventing the inner wall of the human body from being damaged, the adjusting handle 4 is pushed forward, and when the injection is required to be carried out on the endometrium, the adjusting handle 4 and the fixed handle 3 are relatively displaced, so that the injection needle 1 extends out of the outer sleeve 2 after entering the endometrium, and the injection on the endometrium is realized; when the injection is completed, the adjusting handle 4 is pulled reversely again, so that the injection needle 1 returns into the outer sleeve 2, thereby protecting the human body when the injection is withdrawn and avoiding the scratch of the injection needle 1.

As shown in fig. 7 and 8, the outer sleeve 2 includes a straight portion 21 and a curved portion 22; the injection needle 1 comprises an arc-shaped part 11 and a linear part 12; the bending angle of the arc-shaped part 11 is consistent with that of the bending part 22; the bending angles of the arc-shaped part 11 and the bending part 22 are designed according to the physiological structure of the human body, so that the outer sleeve 2 accords with the physiological structure of the approach of the human body and the physiological structure of the cervical canal, and is convenient for better placement; the injection needle 1 is hidden in the outer sleeve 2 and is placed together, so that the injection needle can conveniently enter the uterine cavity through the vaginal and cervical pipelines; through the rotation operation, the injection needle 1 can rotate relative to the outer sleeve 2, so that the injection to the front, back and side walls of the uterus in the uterine cavity is realized, and the injection blind area is avoided.

Specifically, as shown in fig. 6, the sliding teeth 43 are a plurality of continuous annular protruding structures; the sliding groove 33 is a plurality of continuous annular groove structures, the diameter of the annular protruding structure is smaller than the diameter of the groove bottom of the annular groove and larger than the diameter of the edge of the annular groove, namely, the annular protruding structure can rotate in the annular groove, and when the adjusting handle 4 needs to be pushed, the annular protruding structure deforms, so that the injection needle 1 extends out; after the injection needle 1 extends out for a required length, the annular groove can avoid the penetration of the annular bulge, thereby playing a limiting role and ensuring the injection position; specifically, when the injection needle 1 is used for injecting the left endometrium of the uterine cavity, in order to inject the right endometrium of the uterine cavity, at this time, the adjusting handle 4 is rotated, so that the sliding teeth on the pushing rod 5 rotate in the sliding groove, thereby driving the pushing rod 5 to rotate to the right side, and further driving the injection needle 1 to rotate, and realizing the right endometrium injection of the uterine cavity.

The included angle between the arc-shaped part 11 and the linear part 12 of the injection needle 1 ranges from 160 degrees to 176 degrees, and the maximum diameter of the injection needle 1 is 1.21mm; the extension length of the injection needle 1 extending out of the outer sleeve 2 is at least 6mm, so that the injection requirement of actual injection is met.

Specifically, the outer sleeve 2 is made of medical polymer materials, meets the hardness required by placement, has certain elasticity and has a buffering protection effect on the inner wall; the injection needle 1 is made of a material developed under ultrasound, and medical staff can watch the position of the injection needle 1 in the uterine cavity under the action of external ultrasound.

In particular, as shown in fig. 7 to 8, the straight portion 21 and the curved portion 22 of the outer sleeve 2 are integrally formed; the arc-shaped part 11 and the linear part 12 of the injection needle 1 are integrally formed; the end part of the arc-shaped part 11 far away from the linear part 12 is provided with a clamping joint 13; the clamping connector 13 is detachably connected with the pushing rod 5, so that the injection needle 1 can be conveniently replaced in the use process, different injection requirements are met, and the sanitation standard is met.

As shown in fig. 4, the adjusting handle 4 includes an adjusting lever 41, a pressing piece 42, and a connecting head 44; the sliding teeth 43 are positioned in the circumferential direction of the adjusting rod 41; one end of the adjusting rod 41 is connected with the pushing rod 5, and the other end is provided with a connector 44; two pressing pieces 42 are symmetrically distributed on two sides of the connector 44, the connector 44 can be conveniently and detachably connected with the liquid medicine injection body 6, and the pressing pieces 42 can provide pressing contact positions for users to press conveniently.

As shown in fig. 5, the fixing handle 3 includes a connection pipe 31 and a pressing ring 32; the sliding groove 33 is positioned on the inner wall of the connecting pipe 31; two pressing rings 32 are symmetrically distributed at the end part of the fixed handle 3, which is close to the liquid medicine injection body 6, the pressing rings 32 can provide an impetus for a user, and the inner diameter of the pressing rings 32 can enable fingers to pass through.

When the pressing ring 32 is abutted against the pressing piece 42, the length of the injection needle 1 extending out of the outer sleeve 2 meets the injection use length, so that an operator can conveniently control the extending length of the injection needle 1, and the operation and the use are convenient.

Example 2

As shown in fig. 9, there is provided a uterine cavity injection device comprising a bending adjustment traction wire 7 in addition to the structures of embodiment 1; one end of the bending adjustment traction wire 7 is connected to the end part of the outer sleeve 2 close to the injection needle 1, the other end extends out of the fixed handle 3, and the extending end is connected with a traction handle 71; the inner walls of the outer sleeve 2 and the fixed handle 3 are provided with a passing channel capable of accommodating the bending adjustment traction wire 7 to pass through; the end part of the passage channel, which is away from the fixed handle 3, is positioned at the joint of the straight part 21 and the bending part 22 of the outer sleeve 2; a through hole is arranged at the connecting line of the straight part 21 and the bending part 22; the through hole is communicated with the passing channel; the bending adjustment traction wire 7 is exposed at the bending portion 22 of the outer sleeve 2, and the bending adjustment traction wire 7 is hidden on the side wall at the straight portion 21 of the outer sleeve 2; the proximal end of the bending adjustment traction wire 7 is fixed on the bending part 22 of the outer sleeve 2 in an injection molding mode, and the distal end of the bending adjustment traction wire 7 is externally connected with the traction handle 71 after penetrating out from the side wall of the fixed handle 3.

The setting of crooked regulation pull wire 7 can assist the crooked degree of regulation outer tube 2 for it is more smooth transvaginal to pass through to palace chamber pipeline when putting into, because different patient physiological structures are slightly different, in this embodiment, under the user state, only need outwards pull handle 71 makes crooked regulation pull wire 7 to the distal end stretch, then under the exogenic action of outer tube 2, can realize crooked regulation.

The working principle of the utility model is as follows: by adjusting the relative position between the fixed handle 3 and the adjusting handle 4, the injection needle 1 is hidden in the outer sleeve 2 when being placed, the inner wall is prevented from being damaged, the protection effect is realized, when the intrauterine device needs to be injected, the adjusting handle 4 is pushed forward, the relative position between the adjusting handle 4 and the fixed handle 3 is controlled, and after the injection needle 1 enters the uterine cavity, the injection needle extends out of the outer sleeve 2, so that the injection of the intrauterine device is realized; when the injection is completed, the adjusting handle 4 is controlled again, so that the injection needle 1 returns to the outer sleeve 2, and the protection function is realized when the injection is withdrawn; when the intrauterine anterior, posterior and lateral walls need to be injected, the adjusting handle 4 is rotated, the adjusting handle 4 drives the push rod 5 and the injection needle 1 to rotate, so that the needle tip of the injection needle 1 is aligned to different positions of the intrauterine wall, in order to avoid damage to a human body in the rotating process, the rotating operation is only fine adjustment of the angle, if the angle needs to be changed greatly, the outer sleeve 2 is in a relatively spacious position for rotating operation, and the rotating operation can be performed before the injection needle 1 extends out of the outer sleeve 2.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other.

The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the utility model without departing from the principles thereof are intended to be within the scope of the utility model as set forth in the following claims.

Claims

1. The uterine cavity injection device is characterized by comprising an injection needle (1), an outer sleeve (2), a fixed handle (3), an adjusting handle (4) and a liquid medicine injection body (6); the injection needle (1) is connected with the adjusting handle (4) through a hollow pushing rod (5); the injection end of the liquid medicine injection body (6) is detachably inserted into the adjusting handle (4) so that the liquid medicine injection body (6) is communicated with the injection needle (1); the outer sleeve (2) is sleeved outside the injection needle (1), the pushing rod (5) and the adjusting handle (4); the end part of the outer sleeve (2) close to the adjusting handle (4) is connected with the fixed handle (3); the outer sleeve (2) comprises a straight part (21) and a bending part (22); the injection needle (1) comprises an arc-shaped part (11) and a linear part (12); the bending angle of the arc-shaped part (11) is consistent with that of the bending part (22); a sliding groove (33) is arranged in the fixed handle (3); the adjusting handle (4) is provided with sliding teeth (43) matched with the sliding grooves (33); when the adjusting handle (4) is pushed, the sliding teeth (43) are extruded and deformed, so that the adjusting handle (4) drives the injection needle (1) to extend out of the end part of the outer sleeve (2) away from the fixed handle (3); when the adjusting handle (4) is rotated, the sliding teeth (43) can rotate relative to the sliding groove (33).

2. Uterine cavity injection device according to claim 1, characterized in that the sliding tooth (43) is a plurality of continuous annular protruding structures; the sliding groove (33) is a plurality of continuous annular groove structures; the diameter of the annular bulge structure is smaller than the diameter of the bottom of the annular groove and larger than the diameter of the edge of the annular groove.

3. Uterine cavity injection device according to claim 1, characterized in that the angle between the arc-shaped part (11) and the linear part (12) of the injection needle (1) ranges from 160 ° to 176 °.

4. Uterine cavity injection device according to claim 1, characterized in that the straight portion (21) and the curved portion (22) of the outer sleeve (2) are integrally formed; the arc-shaped part (11) and the linear part (12) of the injection needle (1) are integrally formed; the end part of the arc-shaped part (11) far away from the linear part (12) is provided with a clamping joint (13); the clamping connector (13) is detachably connected with the pushing rod (5).

5. Uterine cavity injection device according to claim 1, characterized in that the adjustment handle (4) comprises an adjustment lever (41), a pressing piece (42) and a connector (44); the sliding teeth (43) are positioned in the circumferential direction of the adjusting rod (41); one end of the adjusting rod (41) is connected with the pushing rod (5), and the other end of the adjusting rod is provided with a connector (44); two pressing pieces (42) are symmetrically distributed on two sides of the connector (44).

6. Uterine cavity injection device according to claim 5, characterized in that the fixation handle (3) comprises a connection tube (31) and a pressing ring (32); the sliding groove (33) is positioned on the inner wall of the connecting pipe (31); two pressing rings (32) are symmetrically distributed at the end part of the fixed handle (3) close to the liquid medicine injection body (6);

when the pressing ring (32) is propped against the pressing piece (42), the length of the injection needle (1) extending out of the outer sleeve (2) meets the injection use length.

7. Uterine cavity injection device according to claim 1, characterized in that the maximum diameter of the injection needle (1) is 1.21mm; the extension length of the injection needle (1) extending out of the outer sleeve (2) is at least 6mm.

8. Uterine cavity injection device according to claim 1, characterized in that the outer sleeve (2) is manufactured from a medical polymer material; the injection needle (1) is made of a material developed under ultrasound.

9. Uterine cavity injection device according to claim 1, characterized in that it further comprises a bending adjustment traction wire (7); one end of the bending adjustment traction wire (7) is connected to the end part of the outer sleeve (2) close to the injection needle (1), the other end of the bending adjustment traction wire extends out of the fixed handle (3), and the extending end of the bending adjustment traction wire is connected with a traction handle (71).

10. Uterine cavity injection device according to claim 9, characterized in that the inner walls of the outer sleeve (2) and the fixed handle (3) are provided with a passage through which the bending adjustment traction wire (7) can be accommodated; the end part of the passage channel, which is away from the fixed handle (3), is positioned at the joint of the straight part (21) and the bending part (22) of the outer sleeve (2); a through hole is arranged at the connecting line of the straight part (21) and the bending part (22); the through-hole communicates with the through-passage.