Stent-free fixed intrauterine device

Abstract

The invention discloses a support-free fixed intrauterine contraceptive ring, relates to the technical field of medical instruments, and particularly aims to solve the problems that in the background technology, an existing contraceptive ring needs a support, a hook or a Knettone knot to be fixed, a patient feels uncomfortable after being used for a long time, a professional doctor needs to operate when the contraceptive ring is taken out, and operation is inconvenient. In order to solve the problems that in the prior art, in order to solve the problems that in the prior art, a patient feels more painful in the intrauterine ring taking process, a non-support fixing type intrauterine ring taking device is provided and comprises a Y-shaped support, a medicine cylinder, a control tube, a positioning needle assembly and a control mechanism, a brand-new and more stable fixing mode is achieved, and after long-time use, the intrauterine ring taking device can be used for intrauterine ring taking. The positioning needle group can be automatically absorbed by the body to finally fold the contraceptive ring and discharge the contraceptive ring out of the body conveniently, so that the ring taking pain of a patient is relieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a bracketless fixed intrauterine contraceptive ring. Background Art

[0002] An IUD is a contraceptive device placed inside the uterine cavity. Because most early devices were ring-shaped, they are often called contraceptive rings, also known as intrauterine devices (IUDs), or simply IUDs. They are typically made of materials such as stainless steel, plastic, and silicone rubber. Unmedicated IUDs are called inert IUDs. IUDs supplemented with progestin or copper, which can enhance contraceptive effectiveness, are called medicated or active IUDs. They are a common type of contraceptive device in my country. There are many types of IUDs, with the most commonly used in China including the metal single-ring twisted ring, the mixed ring, the IUD, and the T-ring.

[0003] Traditional IUDs are mostly fixed in the uterus by means of stents, hooks or sutures. However, these fixing methods have many problems in actual use. For example, after long-term use, the stent will wear the uterine wall and cause adverse reactions such as inflammation. Hook-type fixation is sometimes difficult to accurately adapt to the physiological structure of the uterus of different women, causing the IUD to shift or even fall off, and even worse, seriously affecting the contraceptive effect. When a woman is at the end of the IUD use cycle, she needs to remove the IUD. The traditional method of removing the IUD is usually to pull it out of the woman's body directly without retracting the IUD in its open state, causing the IUD removal process to cause great pain to the woman. The IUD removal operation requires a professional doctor to perform the operation. The doctor needs to use instruments to enter the uterine cavity to grab the IUD. This process may not only cause risks such as uterine perforation and infection, but also greatly increase the difficulty of removing the IUD for some women with postmenopausal uterine atrophy.

[0004] For example, the patent document with the announcement number CN220714140U discloses a new type of contraceptive ring, including a connecting block, a connecting head is provided on the upper side of the connecting block, and polypropylene non-biological sutures are fixedly connected on the upper and lower sides of the connecting block, the upper end of the upper polypropylene non-biological suture is fixedly connected with a Guinness knot, and the periphery of the lower polypropylene non-biological suture is fixedly connected with multiple longitudinal tubes from top to bottom, the periphery of the longitudinal tubes is provided with an outer membrane, and levonorgestrel is provided inside the longitudinal tubes, and a pushing device is provided on the lower side of the periphery of the connecting block; when the new type of contraceptive ring is fixed in the uterine cavity, the polypropylene non-biological suture and the Guinness knot provided on the polypropylene non-biological suture are fixed at 1 cm of the uterine myometrium to fix the above-mentioned new type of contraceptive ring in the uterine cavity. This method makes it extremely inconvenient to remove the ring and causes great pain to the patient.

[0005] Therefore, it is urgent to design a stent-free fixed intrauterine contraceptive ring to solve the above problems. Summary of the Invention

[0006] In response to the problems in the above-mentioned prior art that the existing contraceptive ring requires a bracket, hook or Guinea knot for fixation, which causes discomfort to the patient after long-term use, and requires a professional doctor to perform the operation when removing the ring, and the patient is in pain during the removal process, the present invention provides a new and more stable fixation method, and after long-term use, the fixing needle can be absorbed by the body by itself, and eventually the contraceptive ring will be retracted, which is convenient for excretion from the body and reduces the pain of the patient when removing the ring; specifically, the contraceptive ring is stably fixed through negative pressure adsorption, reducing various problems caused by improper fixation, and the fixing device is made of human-absorbable material. When a woman is at the end of the contraceptive ring use cycle, the fixing device is automatically absorbed by the body, and the contraceptive ring automatically retracts and is convenient for excretion from the body, greatly improving the experience and safety of women using the contraceptive ring.

[0007] The bracket-free fixed intrauterine contraceptive ring of the present invention includes a Y-shaped bracket, a cartridge, a control tube, a positioning needle assembly and a control mechanism. The cartridge is used to be infused with levonorgestrel and is used to stably release levonorgestrel to achieve a contraceptive effect. The control tube is inserted into the inner cavity of the cartridge, the Y-shaped bracket is arranged at the upper end of the control tube, and the positioning needle assembly is movably inserted at both ends of the Y-shaped bracket to fix the intrauterine contraceptive ring in the uterine cavity. The control mechanism is arranged in the Y-shaped bracket and is used in conjunction with the positioning needle assembly to lift the positioning needle assembly and insert it into the myometrium, while allowing the positioning needle assembly to be adsorbed in the myometrium, and after the use cycle of the intrauterine contraceptive ring ends, the force constraining the positioning needle assembly disappears, thereby allowing the Y-shaped bracket to be folded, making it easy for the intrauterine contraceptive ring to be removed from the uterine cavity.

[0008] The use of the bracket-free fixed intrauterine contraceptive ring of the present invention provides a safe and stable fixing method, which avoids inflammation and damage to the uterine cavity caused by long-term use of the existing fixing method. At the same time, after the use cycle of the contraceptive ring ends, the contraceptive ring is automatically retracted, which is convenient for medical staff to remove, alleviates the patient's pain, and avoids the difficulty of removing the opened contraceptive ring and increases the patient's pain during the removal process.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A fixed intrauterine device without a holder, comprising a cartridge and further comprising: The Y-shaped bracket is a hollow structure with left and right wings that can extend outwards. a control tube, inserted into the inner cavity of the cartridge, and the inner cavity is perfused with levonorgestrel; Two positioning pin assemblies are movably inserted into the left wing and the right wing respectively, and are used to fix the Y-shaped bracket.

[0010] In this preferred embodiment, the positioning needle assembly is used to fix the intrauterine contraceptive ring in the uterine cavity; Preferably, each positioning needle assembly includes a control mechanism, and two control mechanisms are symmetrically arranged at both ends of the inner cavity of the Y-shaped bracket for controlling the movement of the positioning needle assembly.

[0011] In this preferred embodiment, the control mechanism is arranged in the Y-shaped bracket and is used in conjunction with the positioning needle assembly to lift the positioning needle assembly and insert it into the myometrium, while allowing the positioning needle assembly to be adsorbed in the myometrium. After the contraceptive ring usage cycle ends, the force constraining the positioning needle assembly disappears, thereby allowing the Y-shaped bracket to be folded, making it easier for the contraceptive ring to be removed from the uterine cavity.

[0012] Preferably, the control mechanism includes: A control block assembly is disposed in the inner cavity of the Y-shaped bracket; The balancing control block position assembly is configured to balance the force on both sides of the control block component and balance the control block position.

[0013] Preferably, the balance control block position assembly includes: A first tensioning assembly is connected to one end of the control block assembly, and the other end passes through the Y-shaped bracket and then into the Y-shaped bracket cavity, and is connected to the inner cavity of the control tube; The second tension component is arranged in parallel with the first tension component, and one end of the second tension component is connected to the control block component, and the other end of the second tension component is movable out of the inner cavity of the control tube and fixedly connected to the inner cavity of the control tube; The balancing tension component is connected to the other end of the control block component and is used to balance the tension added by the first tension component and the second tension component.

[0014] In this preferred solution, the balancing tension component, the second tension component and the first tension component work together to maintain the initial state of the positioning pin component and the subsequent retraction effect of the Y-shaped bracket by utilizing the principle of mechanics.

[0015] Preferably, the first tension component and the second tension component both include elastic members and flexible members connected to each other.

[0016] Preferably, the balancing tension assembly comprises: Balance rope, one end of which is connected to the Y-shaped bracket; A hook member connected to the other end of the balance rope, and the other end is connected to the control block assembly through a connecting rod; Wherein, a slot which is adapted to the positioning pin assembly is provided on the connecting rod, and the hook is movably inserted into the slot from bottom to top.

[0017] Preferably, the positioning needle assembly comprises: The degradable fixing needle is movably inserted into the Y-shaped bracket and is hollow. A suction hole communicating with the inner cavity of the degradable fixing needle is provided on the degradable fixing needle. The negative pressure generating component is movably inserted at the lower end of the degradable fixing needle and is used to generate negative pressure for the degradable fixing needle.

[0018] Preferably, the negative pressure generating component comprises: The plug body is movably inserted into the degradable fixing needle; The driving assembly is arranged at the lower end of the plug body and is used in conjunction with the balancing tension assembly to release the tension of the balancing tension assembly.

[0019] Preferably, the drive assembly comprises: Two synchronization rods are symmetrically arranged on both sides of the lower end of the plug body and are abutted against the V-shaped drive rod on the control block assembly; The plug is arranged at the bottom end of the plug body.

[0020] Preferably, both the synchronization rod and the V-shaped driving rod are polished rods.

[0021] The beneficial effects of the present invention are as follows: the present invention discloses a bracketless fixed intrauterine contraceptive ring. Compared with the prior art, the present invention has the following improvements: (1) The present invention solves the problem of setting the positioning needle assembly and the control mechanism by designing the Y-shaped bracket as a hollow structure, so that the positioning needle assembly and the control mechanism can be set on the contraceptive ring without adding any additional structure to the contraceptive ring, so that the contraceptive ring always maintains the traditional structure and does not affect the appearance and use of the contraceptive ring.

[0022] (2) The present invention solves the problem of fixing the intrauterine contraceptive ring through the design of the positioning needle assembly, and achieves a more stable fixation of the intrauterine contraceptive ring in the patient's uterine cavity. In addition, the positioning needle assembly is easy to operate and has a good fixing effect during the fixing process; Furthermore, the positioning needle assembly is a combination of a degradable fixing needle and a driving assembly, which not only allows the degradable fixing needle to be firmly inserted and adsorbed in the patient's uterine cavity, but also after the user's contraceptive ring usage cycle ends, it is absorbed by the user herself, and the driving assembly loses its restraining force, resulting in the disappearance of the tension acting on the Y-shaped bracket, thereby causing the Y-shaped bracket to automatically collapse, making it easier for medical staff to remove the collapsed contraceptive ring, greatly reducing the patient's pain in removing the ring.

[0023] (3) The present invention solves the operational problem of inserting and adsorbing the positioning needle assembly into the patient's uterine cavity through the design of the control mechanism, and realizes the convenient, quick and simple fixation of the positioning needle assembly in the patient's uterine cavity, so that the intrauterine contraceptive ring is stably placed in the user's uterine cavity to achieve the contraceptive effect; The control mechanism realizes the folding of the Y-shaped support by changing three different tensions of the first tension assembly, the second tension assembly and the third tension assembly and making them interact, so that the positioning needle assembly is inserted into the adsorption at the same time, and the Y-shaped support is folded after the use period of the intrauterine contraceptive ring ends, and the medical staff can take it out. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is an initial state diagram of the intrauterine contraceptive ring without support fixation of the application; Figure 2 It is a structure diagram of the intrauterine contraceptive ring without support fixation of the application; Figure 3 It is a sectional view of the intrauterine contraceptive ring without support fixation of the application Figure 1 ; Figure 4 It is a sectional view of the intrauterine contraceptive ring without support fixation of the application Figure 1 ; Figure 5 It is an enlarged view of A part of the application; Figure 6 It is an enlarged view of B part of the application; Figure 7 It is a sectional view of the intrauterine contraceptive ring without support fixation of the application Figure 2 ; Figure 8 It is an enlarged view of C part of the application; Figure 9 It is a sectional view of the intrauterine contraceptive ring without support fixation of the application Figure 2 ; Figure 10 It is a fixed state diagram of the intrauterine contraceptive ring without support fixation of the application; Figure 11 It is an enlarged view of D part of the application; Figure 12 It is a structure diagram of the positioning needle assembly of the application; Figure 13 It is a schematic diagram of the connection relationship of the balance pull rope of the application; Figure 14 It is a folding state diagram of the intrauterine contraceptive ring without support fixation of the application; Figure 15 It is a folding state sectional view of the intrauterine contraceptive ring without support fixation of the application; Among them: 1. Cartridge; 2. Control tube; 201. Pull block; 202. Connecting block; 3. Y-shaped bracket; 4. Positioning needle assembly; 401. Degradable fixing needle; 401-1. Suction hole; 402. Plug body; 403. Drive assembly; 403-1. Synchronous rod; 403-2. Insert block; 5. Control mechanism; 501. Control block assembly; 501-1. Control block; 501-1A. Connecting rod; 501-1B. Slot; 501-2. V-shaped drive rod; 502. First tension assembly; 502-1. First pull rope; 502-2. Spring 1; 503. Second tension assembly; 503-1. Second pull rope; 504. Balance tension assembly; 504-1. Balance pull rope; 504-2. Spring 2; 504-3 Hook. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to The present invention is described but not intended to limit the scope of the present invention.

[0026] In the description of the present invention, unless otherwise specified, "plurality" means two or more; the directions or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections. They may also refer to mechanical connections or electrical connections. They may also refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. Example 1

[0028] Refer to the attached Figure 1-2The illustrated stentless fixed intrauterine contraceptive ring comprises a Y-shaped stent 3 and a cartridge 1. The Y-shaped stent 3 includes left and right wings that can extend outward, and the Y-shaped stent 3 is disposed at the upper end of the cartridge 1. The cartridge 1 is infused with levonorgestrel for stable release of levonorgestrel, thereby meeting the patient's contraceptive needs. During productization, the intrauterine contraceptive ring of this embodiment is packaged in a sterile package for easy transportation and maintaining a sterile environment. The length and width of the intrauterine contraceptive ring of this embodiment are both 32 mm, and the levonorgestrel content in the cartridge 1 is 52 mg. The material of the Y-shaped stent 3 and the cartridge 1 is preferably polyethylene, which is friendly to patients with metal allergies. Levonorgestrel mainly exerts a local progestin effect in the uterine cavity, preventing pregnancy through multiple mechanisms: increased cervical mucus viscosity prevents sperm from passing into the uterus, inhibits sperm motility or survival, and changes the endometrium. Morphological changes caused by local high concentrations of levonorgestrel include stromal pseudodecidualization, glandular atrophy, lymphocyte infiltration, and reduced mitosis of glandular and stromal cells; levonorgestrel acts directly on the endometrium and has a strong inhibitory effect on the endometrium, which can reduce the duration and amount of menstrual bleeding. The initial in vivo release rate of levonorgestrel is approximately 20 μg / 24 hours, which decreases to 10 μg / 24 hours after 5 years; The cartridge 1 used in the present invention is prior art and has not been improved. In the prior art, after the cartridge 1 for releasing levonorgestrel is used, according to the blood drug concentration measurement result, the levonorgestrel is directly released into the uterine cavity after placement without any delay. The higher local drug exposure in the uterine cavity results in a stronger concentration gradient from the endometrium to the myometrium (>100-fold), resulting in lower serum levonorgestrel concentrations (>1000-fold from the endometrium to the serum). Levonorgestrel can be detected in serum after placement of the levonorgestrel-releasing intrauterine system. Due to the decreased release rate, the median serum levonorgestrel concentration in women of childbearing age weighing more than 55 kg decreased from 206 pg / ml (25th to 75th percentiles: 151 pg / ml to 264 pg / ml) at 6 months to 194 pg / ml (146 pg / ml to 266 pg / ml) at 12 months, and to 131 pg / ml (113 pg / ml to 161 pg / ml) at 60 months.

[0029] The use process of the stentless fixed intrauterine contraceptive ring of this embodiment includes: Step 1. Completely tear open the sterile packaging of the intrauterine contraceptive ring, then put on sterile gloves and perform aseptic operation; Step 2. Place the IUD into the placement tube of the inserter; Step 3. Use the inserter to place the IUD into the uterine cavity according to the uterine cavity depth measured by the uterine sound; Step 4. Continue to hold the inserter firmly, push out the IUD and wait 5-10 seconds for the Y-shaped stent to fully expand. Step 5. Gently push the placement device to the fundus of the uterus until the Y-shaped stent touches the cervix. At this point, the IUD has been placed at the fundus of the uterus and helps the Gini ring anchor in the myometrium. Step 6. Open the intrauterine delivery system of cartridge 1 through the placement device to release levonorgestrel; Step 7. Gently pull out and remove the applicator. Example 2

[0030] The difference between Example 2 and Example 1 is that, based on Example 1, considering that some patients are prone to displacement and shedding of the IUD due to uterine enlargement, deep uterine cavity, and loose cervix, in clinical practice, in order to avoid the occurrence of the above problems, the IUD is generally further fixed in the patient's uterine cavity by means of a bracket, a hook, or a Guinness knot, so as to overcome the displacement and shedding of the IUD. However, the above methods either require an additional fixing structure or a suturing operation. The added fixing structure will wear the uterine wall after long-term use, causing discomfort to the patient and easily causing uterine cavity inflammation. The suturing operation also increases the pain of the patient. After the use cycle of the IUD ends, whether the IUD is fixed by a fixing structure or a Guinness knot, there is a problem of difficulty in removing the ring and increased pain for the patient. Therefore, based on the above problems, this embodiment further optimizes the design on the basis of the IUD in Example 1 to overcome the above problems. Specific reference attached Figure 3-9 As shown, based on the intrauterine contraceptive ring of Example 1, the Y-shaped bracket 3 is set to a hollow structure, and a positioning needle assembly 4 and a control mechanism 5 are additionally designed. There are two positioning needle assemblies 4, which are movably inserted into the left and right wings of the Y-shaped bracket 3, respectively, for fixing the Y-shaped bracket 3 from two connection points. The control mechanism 5 is symmetrically arranged at both ends of the inner cavity of the Y-shaped bracket 3, and is respectively connected to the two positioning needle assemblies 4, for controlling the positioning needle assembly 4 to be inserted into the myometrium to complete the fixation, and a control tube 2 is fixedly provided in the cartridge 1; The control mechanism 5 includes a control block assembly 501 and a balance control block position assembly. The control block assembly 501 is disposed in the inner cavity of the Y-shaped bracket 3. For example, the control block assembly 501 may be a square structure that can slide freely in the inner cavity of the Y-shaped bracket 3. The balance control block position assembly is configured to balance the force on both sides of the control block assembly 501, thereby balancing the position of the control block. Further references Figure 3As shown, the balance control block position assembly includes a first tension component 502, a second tension component 503 and a balance tension component 504, and the first tension component 502 and the second tension component 503 each include an elastic member and a flexible member connected to each other. For example, the elastic member is a spring and the flexible member is a pull rope. During use, the tension of the second tension component 503 is canceled. At this time, the tension of the balancing tension component 504 is greater than the tension of the first tension component 502. Then, under the action of the balancing tension component 504, it pulls the control block component 501 to move and slowly approach the end of the Y-shaped bracket 3. The control block component 501 moves to drive the positioning needle component 4 to slowly move upward and penetrate into the myometrium. The first tension component 502 is connected to one end of the control block 501. For example, the first tension component 502 can be hung or bonded to one end of the control block 501, and the other end is inserted into the inner cavity of the Y-shaped bracket 3 after passing through a certain distance, and is connected to the inner cavity of the control tube 2. The tension applied by the first tension component 502 to the control block 501 is recorded as F1. The first tension component 502 is used in conjunction with the second tension component 503 and the balancing tension component 504 to balance the initial state of the positioning needle assembly 4 and, at the same time, to retract the contraceptive ring after the use cycle is completed, so as to facilitate its removal. The second tension component 503 is connected to one end of the control block 501. For example, the second tension component 503 can be hung or bonded to one end of the control block 501, and the other end can be movably extended out of the inner cavity of the control tube 2 and fixedly connected to the inner cavity of the control tube 2. The tension applied to the control block 501 by the second tension component 503 is recorded as F2, which is consistent with the direction of the tension F1. The balancing tension component 504 is connected to the other end of the control block 501. The balancing tension component 504 can be hung or bonded to one end of the control block 501, and the other end is fixedly connected to the inner side wall of the Y-shaped bracket 3. It is used to balance the tension added by the first tension component 502 and the second tension component 503. The tension applied to the control block 501 by the balancing tension component 504 is recorded as F3, which is opposite to the direction of the tensions F1 and F2. After the contraceptive ring is deployed in the uterine cavity, F1+F2=F3, thereby ensuring that the positioning needle assembly 4 in the deployed contraceptive ring is in the initial state, that is, the upper end of the positioning needle assembly 4 leaks a little on the upper end surface of the Y-shaped bracket 3. For further details, please refer to the attached Figure 5As shown, the control block assembly 501 includes a control block 501-1 and a V-shaped drive rod 501-2. The control block 501-1 is movably arranged in the inner cavity of the Y-shaped bracket 3; there are two V-shaped drive rods 501-2, which are symmetrically arranged on both sides of the control block 501-1 and are against the positioning needle assembly 4, and are used to drive the positioning needle assembly 4 to move upward and penetrate the myometrium; wherein, the control block 501-1 is preferably a square structure and is movably arranged in the inner cavity of the Y-shaped bracket 3, that is, it can slide freely in the inner cavity of the Y-shaped bracket 3, and the V-shaped drive rod 501-2 is symmetrically arranged on one side of the control block 501-1 and is against the positioning needle assembly 4, and is used to drive the positioning needle assembly 4 to move upward and penetrate the myometrium; Refer to the attached Figure 3-4 As shown, the first pulling assembly 502 includes a first pulling rope 502-1 and a spring 1 502-2. The first pulling rope 502-1 is connected to one end of the control block 501, and the spring 1 502-2 is connected to the other end of the first pulling rope 502-1. The other end of the spring 1 502-2 is connected to the pulling block 201 disposed in the inner cavity of the control tube 2. The pulling block 201 is fixedly disposed in the inner cavity of the control tube 2. That is, the pulling block 201 applies a pulling force F1 to the first pulling rope 502-1 through the spring 1 502-2. In this embodiment, refer to the attached Figure 4 As shown, there are two first pull ropes 502-1, one at each end of the Y-shaped bracket 3. The two first pull ropes 502-1 converge at the upper end of the control tube 2 and then merge into one pull rope, which then moves out of the connecting block 202. This arrangement ensures the synchronous movement of the two first pull ropes 502-1 and saves space. Reference is made to the attached Figure 7 As shown, the second tension component 503 is a second pull rope 503-1, which is connected to one end of the control block 501, and the other end passes through the connecting block 202 provided in the control tube 2, extends to the outer end of the control tube 2, and is fixedly connected to the inner wall of the control tube 2; illustratively, the second pull rope 503-1 movably passes through the connecting block 202, and is fixedly connected to the bottom of the inner cavity of the control tube 2. Preferably, the fixing method is bonding. This bonding and fixing method facilitates the subsequent removal of the second pull rope 503-1 from the fixing point between it and the inner cavity of the control tube 2, thereby realizing the insertion of the positioning needle assembly 4; In this embodiment, there are two second pull ropes 503-1, one at each end of the Y-shaped bracket 3. The two second pull ropes 503-1 pass through the connecting block 202 and merge into one pull rope at the control tube 2. The second pull ropes 503-1 then pass through the outside of the lower end of the control tube 2 and are fixedly connected to the bottom of the inner cavity of the control tube 2. Reference is made to the attached Figure 6As shown, the balance tension assembly 504 includes a balance pull rope 504-1 connected with the other end of the control block 501-1 for balancing the added tension of the first pull rope 502-1 and the second pull rope 503-1, and a spring 504-2 connected with the other end of the balance pull rope 504-1, the other end of the spring 504-2 being fixedly connected with the end of the Y-shaped support 3 through a fixed plate.

[0031] The use process of the intrauterine device ring without support fixation in the embodiment is as follows: when the intrauterine device ring is placed in the uterine cavity and unfolded, the first tension assembly 502 and the second tension assembly 503 and the balance tension assembly 504 are used in cooperation, so that the upper end of the positioning needle assembly 4 leaks a little on the upper end surface of the Y-shaped support 3 (i.e. the initial state) as shown in the figure. Figure 1 As shown, at this time, the spring 502-2 and the spring 504-2 are in a stretched state, when the intrauterine device ring is placed at the fundus of the uterus, the second pull rope 503-1 is taken off from the fixed point in the inner cavity of the control tube 2, at this time, since the tension F2 of the second pull rope 503-1 to the control block 501-1 disappears, the tension F3 of the balance pull rope 504-1 is greater than the tension F1 of the first pull rope 502-1, immediately, under the action of the balance pull rope 504-1, the balance pull rope 504-1 pulls the control block 501-1 to slowly move close to the end of the Y-shaped support 3, the movement of the control block 501-1 drives the V-shaped drive rod 501-2 to move synchronously, since in the initial state, the end of the positioning needle assembly 4 has leaked out of the upper end surface of the Y-shaped support 3, therefore, under the limiting action of the Y-shaped support 3, the V-shaped drive rod 501-2 extrudes the positioning needle assembly 4 to slowly move upward and pierce into the uterine muscle layer, and the fixing is completed, here the positioning needle assembly 4 is similar to a Ginai knot. Embodiment 3

[0032] The difference between embodiment 3 and embodiment 2 is that, on the basis of embodiment 2, only the positioning needle assembly 4 is used for fixing, and the fixing effect is not good, therefore, on the basis of the positioning needle assembly 4 in embodiment 2, further design is made to solve the problem of poor fixing effect by means of negative pressure adsorption, so as to achieve the purpose of firm fixing of the intrauterine device ring. Specifically, refer to the accompanying drawings Figure 10-15As shown, the positioning needle assembly 4 includes a degradable fixing needle 401 and a negative pressure generating assembly. The degradable fixing needle 401 is movably inserted into the Y-shaped bracket 3 and is hollow. A suction hole 401-1 communicating with its inner cavity is provided on the degradable fixing needle 401. The degradable fixing needle 401 is preferably made of polylactide-polyethylene oxide triblock copolymer (PLA-PEO), which has controllable degradation characteristics. The degradation cycle can be set to 5 years, which is synchronized with the contraceptive cycle. The products of PLA-PEO degradation are lactic acid and polyethylene glycol, which are excreted through the kidneys after metabolism by the human body, and there is no risk of tissue residue. The negative pressure generating assembly is movably inserted at the lower end of the degradable fixing needle 401 and is used to generate negative pressure for the degradable fixing needle 401. The negative pressure generating assembly includes a plug 402 and a drive assembly 403. The plug 402 is movably inserted into the degradable fixing needle 401 and connected to the inner wall of the Y-shaped bracket 3 via a spring 404. The plug 402 is similar to a piston and is used to create negative pressure within the degradable fixing needle 401, thereby sucking the myometrial tissue through the suction hole 401-1, thereby achieving a further fixation effect. Reference is made to the attached Figure 12 As shown, the driving assembly 403 is arranged at the lower end of the plug body 402 and is abutted against the V-shaped driving rod 501-2. At the same time, it is used in conjunction with the balancing tension assembly 501 to release the tension of the balancing tension assembly 501; Furthermore, the drive assembly 403 includes a synchronization rod 403-1 and an insert block 403-2. The synchronization rod 403-1 is symmetrically arranged on both sides of the lower end of the plug body 402 and is abutted against the V-shaped drive rod 501-2 on the control block assembly 501. For example, the V-shaped drive rod 501-2 and the synchronization rod 403-1 are both smooth rods to reduce friction between the two and facilitate driving. The insert block 403-2 is arranged at the bottom end of the plug body 402. For example, it can be a cylindrical structure. The insert block 403-2 is used in conjunction with the balance tension assembly 504 to release the tension of the balance tension assembly 504. Reference is made to the attached Figure 13 As shown, the specific structure of the plug block 403-2 releasing the tension of the balancing tension assembly 504 is as follows: a connecting rod 501-1A is integrally provided on the control block 501-1. The connecting rod 501-1A is a rectangular parallelepiped structure. A slot 501-1B is defined on the connecting rod 501-1A. The slot 501-1B is located directly below the plug block 403-2. The balancing pull rope 504-1 is movably inserted from bottom to top into the slot 501-1B via a rigid, cylindrical hook 504-3. When the plug body 402 falls from above, the insert block 403-2 just enters the slot 501-1B and squeezes the hook 504-3 out of the slot 501-1B, thereby separating the balance rope 504-1 and the control block 501-1.

[0033] The use process of the bracketless fixed intrauterine contraceptive ring of this embodiment is as follows: the control block 501-1 moves to drive the V-shaped driving rod 501-2 to move synchronously, the V-shaped driving rod 501-2 is set against the synchronization rod 403-1, and squeezes and drives the synchronization rod 403-1 to move upward, so that the degradable fixing needle 401 and the plug body 402 move upward synchronously. At this time, the spring 3 404 is also slowly stretched. After the degradable fixing needle 401 penetrates the myometrium, the V-shaped driving rod 501-2 continues to move, and its action on the driving rod 403-1 is also gradually stretched. The force disappears, and then, the spring three 404 recovers its deformation, which drives the plug body 402 to move downward. At this time, the plug body 402 is similar to a piston. The spring three 404 pulls the plug body 402 back, so that the inner cavity of the degradable fixing needle 401 is in a negative pressure state. Since the degradable fixing needle 401 has been attached to the myometrium, the negative pressure state causes the tissue of the myometrium to be sucked into the inner cavity of the degradable fixing needle 401 through the suction hole 401-1, thereby achieving the adsorption of the degradable fixing needle 401 in the myometrium. At this time, the plug body 402 is still in the inner cavity of the degradable fixing needle 401; After the contraceptive ring is used for a period of time, the degradable fixing needle 401 has also been degraded by the body. At this time, the plug body 402 is free from any constraints, and under the action of the spring three 404, it falls and enters the slot 501-1B, and squeezes the hook 504-3 out of the slot 501-1B, thereby separating the balance rope 504-1 and the control block 501-1; the control block 501-1 loses the tension from the balance rope 504-1. At this time, the spring one 502-2 recovers its deformation, and it pulls the first pull rope 502-1 to pull the control block 501-1 to the center position of the Y-shaped bracket 3. Since the other end of the first pull rope 502-1 is always connected to the control block 501-1, and the control block 501-1 is always in the Y-shaped bracket 3, the first pull rope 502-1 will eventually retract the Y-shaped bracket 3. Figure 15 As shown, it is convenient to take out the contraceptive ring.

[0034] The use process of the stent-free fixed intrauterine contraceptive ring of the present invention is as follows: Step 1. Completely tear open the sterile packaging of the intrauterine contraceptive ring, then put on sterile gloves and perform aseptic operation; Step 2. Place the IUD into the placement tube of the inserter; Step 3. Use the inserter to place the IUD into the uterine cavity according to the uterine cavity depth measured by the uterine sound; Step 4. Continue to hold the inserter firmly, push out the IUD and wait 5-10 seconds for the Y-shaped stent to fully expand. Step 5. The placer is gently pushed to the fundus until the Y-shaped support touches the cervix, at which point the intrauterine contraceptive ring has been placed to the fundus, at which point the contraceptive ring is in the initial state, that is, the first tension assembly 502 and the second tension assembly 503 and the balance tension assembly 504 are used in cooperation with each other, so that the upper end of the positioning needle assembly 4 leaks a little on the upper end surface of the Y-shaped support 3 Spring 1 502-2 and spring 2 504-2 are both in tension state; Subsequently, the second pull rope 503-1 is removed from its fixed point with the inner cavity of the control tube 2, at which point the tension F3 of the balance pull rope 504-1 is greater than the tension F1 of the first pull rope 502-1 due to the disappearance of the tension F2 of the second pull rope 503-1 to the control block 501-1, and then under the action of the balance pull rope 504-1, the balance pull rope 504-1 pulls the control block 501-1 to slowly move close to the end of the Y-shaped support 3, the control block 501-1 moves to drive the V-shaped drive rod 501-2 to move synchronously, the V-shaped drive rod 501-2 extrudes the drive synchronization rod 403-1 to move upwards, and the degradable fixing needle 401 and the plug body 402 move upwards synchronously, at this time, spring three 404 is also slowly stretched, after the degradable fixing needle 401 is inserted into the uterine muscle layer, at this time, the V-shaped drive rod 501-2 moves continuously, and then the driving force of the synchronization rod 403-1 disappears, and then the spring three 404 restores the deformation, which drives the plug body 402 to move downwards, at this time, the plug body 402 is similar to a piston, the spring three 404 pulls the plug body 402 to make the inner cavity of the degradable fixing needle 401 in a negative pressure state, because the degradable fixing needle 401 has been combined with the uterine muscle layer, at this time, due to the negative pressure state, the tissue of the uterine muscle layer is sucked into the inner cavity of the degradable fixing needle 401 from the suction hole 401-1, thereby realizing the adsorption of the degradable fixing needle 401 in the uterine muscle layer, completing the fixation of the contraceptive ring, at this time, the plug body 402 is still in the inner cavity of the degradable fixing needle 401; Step 6. Open the intrauterine release system of the cartridge 1 through the placer to release levonorgestrel; Step 7. Gently pull out and remove the placer.

[0035] Step 8. After the use cycle of the contraceptive ring is over, the degradable fixing needle 401 has also been degraded by the body. At this time, the plug body 402 is not constrained by anything, and under the action of the spring three 404, it falls and enters the slot 501-1B, and squeezes the hook 504-3 out of the slot 501-1B, thereby separating the balance pull rope 504-1 and the control block 501-1; the control block 501-1 loses the tension from the balance pull rope 504-1. At this time, the spring one 502-2 recovers its deformation, and it pulls the first pull rope 502-1 to pull the control block 501-1 to the center position of the Y-shaped bracket 3. Since the other end of the first pull rope 502-1 is always connected to the control block 501-1, and the control block 501-1 is always in the Y-shaped bracket 3, the first pull rope 502-1 will eventually retract the Y-shaped bracket 3, and then the medical staff can operate to remove the contraceptive ring.

[0036] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixed intrauterine contraceptive ring without a support, comprising a cartridge (1), characterized in that: Also includes: The Y-shaped bracket (3) is a hollow structure, including a left wing and a right wing that can extend outward; A control tube (2) is inserted into the inner cavity of the cartridge (1), and the inner cavity is perfused with levonorgestrel; Two positioning pin assemblies (4) are movably inserted into the left wing and the right wing, respectively, and are used to fix the Y-shaped bracket (3).

2. The bracketless fixed intrauterine contraceptive ring according to claim 1, characterized in that: Each positioning needle assembly (4) includes a control mechanism (5), and two control mechanisms (5) are symmetrically arranged at both ends of the inner cavity of the Y-shaped bracket (3) for controlling the movement of the positioning needle assembly (4).

3. The bracketless fixed intrauterine contraceptive ring according to claim 2, characterized in that: The control mechanism (5) comprises: A control block assembly (501) is disposed in the inner cavity of the Y-shaped bracket (3); The balancing control block position assembly is configured to balance the magnitude of forces on both sides of the control block component (501) and balance the position of the control block.

4. The bracketless fixed intrauterine contraceptive ring according to claim 3, characterized in that: The balance control block position assembly includes: The first tension component (502) is connected to one end of the control block component (501), and the other end passes through the Y-shaped bracket (3) and then passes into the inner cavity of the Y-shaped bracket (3), and is connected to the inner cavity of the control tube (2); The second tension component (503) is arranged in parallel with the first tension component (502), and one end of the second tension component (503) is connected to the control block component (501), and the other end of the second tension component (503) is movable out of the inner cavity of the control tube (2) and fixedly connected to the inner cavity of the control tube (2); The balancing tension component (504) is connected to the other end of the control block component (501) and is used to balance the tension added by the first tension component (502) and the second tension component (503).

5. The stentless fixed intrauterine contraceptive ring according to claim 4, characterized in that: The first tension component (502) and the second tension component (503) both comprise elastic members and flexible members that are connected to each other.

6. The stentless fixed intrauterine contraceptive ring according to claim 4, characterized in that: The balancing tension assembly (504) includes: A balance rope (504-1), one end of which is connected to the Y-shaped bracket (3); A hook (504-3) is connected to the other end of the balance pull rope (504-1), and the other end is connected to the control block assembly (501) via a connecting rod (501-1A); The connecting rod (501-1A) is provided with a slot (501-1B) adapted to the positioning pin assembly (4), and the hook (504-3) is movably inserted into the slot (501-1B) from bottom to top.

7. The stentless fixed intrauterine contraceptive ring according to claim 3, characterized in that: The positioning pin assembly (4) comprises: A degradable fixing needle (401) is movably inserted into the Y-shaped bracket (3) and is hollow. A suction hole (401-1) communicating with the inner cavity of the degradable fixing needle (401) is provided on the fixing needle (401); The negative pressure generating component is movably inserted at the lower end of the degradable fixing needle (401) and is used to generate negative pressure for the degradable fixing needle (401).

8. The stentless fixed intrauterine contraceptive ring according to claim 7, characterized in that: The negative pressure generating components include: The plug body (402) is movably inserted into the degradable fixing needle (401); The driving assembly (403) is arranged at the lower end of the plug body (402) and is used in conjunction with the balancing tension assembly (501) to release the tension of the balancing tension assembly (501).

9. The stentless fixed intrauterine contraceptive ring according to claim 8, characterized in that: The driving assembly (403) comprises: Two synchronization rods (403-1) are symmetrically arranged on both sides of the lower end of the plug body (402) and are abutted against the V-shaped driving rod (501-2) on the control block assembly (501); The plug block (403-2) is arranged at the bottom end of the plug body (402).

10. The stentless fixed intrauterine contraceptive ring according to claim 9, characterized in that: The synchronization rod (403-1) and the V-shaped driving rod (501-2) are both polished rods.

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