Degradable uterine cavity support, push-in device and using method

Abstract

The invention discloses a degradable uterine cavity stent and a use method, the degradable uterine cavity stent comprises a stent main body, the stent main body is spiral, and the stent main body is made of a degradable elastomer material. According to the degradable uterine cavity stent, the pushing-in device and the using method, the stent body is in a spiral shape and is made of degradable elastomer materials, the physical isolation effect is achieved, adhesion is effectively prevented, meanwhile, the stent can be naturally degraded and discharged out of the body within one month, and the stent does not need to be taken out through a second operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a degradable intrauterine stent, a pushing device and a use method thereof. Background Art

[0002] Intrauterine adhesions are mainly caused by damage to the basal layer of the endometrium. The most common cause is that the basal layer of the endometrium is scratched, causing the anterior and posterior walls of the uterus to adhere to each other. The common means to solve the problem in the uterine cavity are physical barriers or protective films. Common physical barriers are intrauterine devices or intrauterine support balloons. This method cannot be removed by the patient on their own and requires a second operation, which increases the psychological and economic burden on the patient. The protective film is generally applied to the affected area in the form of sodium hyaluronate gel injection. However, the physical and mechanical strength of sodium hyaluronate gel is poor and it cannot 100% physically isolate the affected area. There is still a probability of intrauterine adhesions after surgery. Both methods have certain defects. Summary of the invention

[0003] The purpose of the present invention is to provide a degradable intrauterine stent, a pushing device and a method of use. The intrauterine stent can be removed automatically after being degraded, and the effect of isolating the affected part can be ensured.

[0004] To this end, in a first aspect, the present invention provides a degradable intrauterine stent, comprising a stent body, wherein the stent body is spiral-shaped and is made of a degradable elastomeric material.

[0005] Preferably, a hollow guide wire channel is provided inside the stent body, and the diameter of the stent body ranges from 1.5 cm to 2 cm.

[0006] Preferably, the material of the stent body is PLACL, PGACL or other degradable elastomeric materials.

[0007] In the second aspect, a device for pushing a degradable uterine cavity stent is provided, comprising a catheter, a push rod and the uterine cavity stent, wherein the catheter is hollow and has openings at both ends, a push rod is provided at one end of the catheter, a uterine cavity stent is provided inside the catheter, and the push rod is used to push the uterine cavity stent out from the other end of the catheter.

[0008] Preferably, the push rod is slidably connected to the catheter, the length of the push rod is greater than the length of the catheter, and the diameter of the push rod is greater than the diameter of the guidewire channel of the uterine cavity stent.

[0009] Preferably, a handle is provided at one end of the push rod.

[0010] Preferably, a fixing ring is provided on the catheter, and the inner diameter of the fixing ring is smaller than the diameter of the uterine cavity stent.

[0011] Preferably, a protrusion is provided on the push rod, and the diameter of the protrusion is larger than the inner diameter of the fixing ring.

[0012] In a third aspect, a method for using a degradable intrauterine stent is provided, which is used for the intrauterine stent, and includes the following steps: straightening the intrauterine stent and inserting it from one end of a catheter; inserting a push rod from the other end of the catheter; and gradually pushing the push rod to push the intrauterine stent out of one end of the catheter, so that the intrauterine stent returns to a spiral shape.

[0013] Preferably, straightening the intrauterine stent and inserting it from one end of the catheter comprises: straightening the intrauterine stent by passing a guide wire through the intrauterine stent, passing one end of the guide wire through the catheter, pulling the guide wire to gradually pull the intrauterine stent into the catheter; and continuing to pull the guide wire to withdraw the guide wire.

[0014] Beneficial effects:

[0015] 1. The present invention provides a degradable intrauterine stent, a pushing device and a method of use. The stent body is spiral-shaped and made of degradable elastomeric material, which has the effect of physical isolation and effectively prevents adhesion. At the same time, it can be naturally degraded and excreted from the body within one month, and does not require a second operation to remove it.

[0016] 2. The pushing device in the present invention straightens the intrauterine stent and then gradually pushes it out, which is convenient for implantation of the intrauterine stent. The intrauterine stent automatically returns to a spiral shape according to its own elastic properties, thereby achieving an isolation effect.

[0017] 3. The intrauterine stent in the present invention is assisted by a guide wire, which makes it easier for the intrauterine stent to penetrate into the catheter, and the setting of the fixing ring makes it easier for the intrauterine stent to stay in the reserved position and for the guide wire to be withdrawn. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The schematic diagram is a structural diagram of a degradable intrauterine stent in the present invention.

[0020] Figure 2 It is a cross-sectional view of a pushing device for a degradable uterine cavity stent in the present invention.

[0021] Figure 3 It is a cross-sectional view of a uterine cavity stent pushing state of a degradable uterine cavity stent pushing device in the present invention.

[0022] Figure 4 This is a diagram of the penetration state of a degradable intrauterine stent of a pushing device for the intrauterine stent of the present invention.

[0023] Figure 5 The present invention is a flowchart of a method for using a degradable intrauterine stent.

[0024] In the figure, 1 is the stent body, 2 is the catheter, 21 is the fixing ring, 3 is the push rod, 31 is the handle, 32 is the protrusion, 4 is the uterine cavity stent, and 5 is the guide wire. DETAILED DESCRIPTION

[0025] The content of the present invention can be more easily understood by selecting the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0026] Embodiment 1:

[0027] Intrauterine adhesions are mainly caused by damage to the basal layer of the endometrium. The most common cause is that the basal layer of the endometrium is scratched, causing the anterior and posterior walls of the uterus to adhere to each other. The common means to solve the problem in the uterine cavity are physical barriers or protective films. Common physical barriers are intrauterine devices or intrauterine support balloons. This method cannot be removed by the patient on their own and requires a second operation, which increases the psychological and economic burden on the patient. The protective film is generally applied to the affected area in the form of sodium hyaluronate gel injection. However, the physical and mechanical strength of sodium hyaluronate gel is poor and it cannot 100% physically isolate the affected area. There is still a probability of intrauterine adhesions after surgery. Both methods have certain defects.

[0028] like Figure 1As shown, in the first aspect, the present invention provides a degradable intrauterine stent, including a stent body 1, the stent body 1 is spiral, and the stent body 1 is a degradable elastomeric material. Among them, a hollow guide wire channel is arranged inside the stent body 1, and the diameter range of the stent body 1 is 1.5cm-2cm. The material of the stent body 1 can be PLACL or PGACL, among which PLACL is preferred. The stent body 1 is a hollow spiral tube with elasticity, which can automatically return to a spiral shape after being straightened, and the spiral stent body 1 can effectively play an anti-adhesion role. PLACL is a polylactic acid-caprolactone copolymer (Poly (lactic-co-caprolactone)). It is polymerized by a chemical synthesis method of two monomers, lactic acid and caprolactone. It is biodegradable and can be gradually decomposed into small molecules such as carbon dioxide and water in the natural environment or in the body. And it has good mechanical properties. The polylactic acid component gives the material a certain strength, while the addition of polycaprolactone increases the flexibility of the material. Its tensile strength and elastic modulus can be adjusted by changing the composition of the copolymer, which can meet the requirements of different tissue engineering application scenarios for the mechanical properties of the material. At the same time, PLALC material has good biocompatibility with human tissues and cells, and cells can adhere, proliferate and differentiate on its surface.

[0029] Second, as Figure 2-3 The figure shows a pushing device for a degradable uterine cavity stent, comprising a catheter 2, a push rod and a uterine cavity stent. The catheter 2 is hollow and has openings at both ends. A push rod 3 is provided at one end of the catheter 2. A uterine cavity stent 4 is provided inside the catheter 2. The push rod 3 is used to push the uterine cavity stent 4 out from the other end of the catheter 2.

[0030] The push rod 3 is slidably connected with the catheter 2, the length of the push rod 3 is greater than the length of the catheter 2, and the diameter of the push rod 3 is greater than the diameter of the guide wire channel of the uterine cavity stent, so as to prevent the push rod from mistakenly entering the hollow guide wire channel of the uterine cavity stent. A handle 31 is provided at one end of the push rod 3. A fixing ring 21 is provided on the catheter 2, the inner diameter of the fixing ring 21 is smaller than the diameter of the uterine cavity stent 4, the diameter of the push rod 3 matches the inner diameter of the fixing ring 21, so as to facilitate the push rod 3 to slide in the catheter 2, and the fixing ring 21 is used to limit the uterine cavity stent 4, so as to facilitate the penetration of the uterine cavity stent 4 and limit its position, so as not to make the uterine cavity stent 4 completely pass through the catheter 2. A protrusion 32 is provided on the push rod 3, and the diameter of the protrusion 32 is greater than the inner diameter of the fixing ring 21. The protrusion 32 is used to limit the push rod 3, and when the push rod 3 is pushed to the position where the protrusion 32 and the fixing ring 21 are located, the protrusion 32 is blocked by the fixing ring 21, and at this time, the push rod 3 completely pushes out the uterine cavity stent 4.

[0031] Thirdly, Figure 4-5 As shown, a method for using a degradable intrauterine stent is provided, which is used for an intrauterine stent 4 and comprises the following steps:

[0032] S1. The uterine cavity stent 4 is straightened by passing the guide wire 5 through the uterine cavity stent 4. Since the uterine cavity stent 4 is elastic and the guide wire 5 is harder than the uterine cavity stent 4, the supporting force of the guide wire straightens the uterine cavity stent 4, which is convenient for the subsequent insertion of the catheter 2.

[0033] S2. Pass one end of the guide wire through the catheter 2, and pull the guide wire 5 to gradually pull the uterine cavity stent 4 into the catheter 2; when one end of the uterine cavity stent 4 is against the end surface of the fixing ring 21, the uterine cavity stent 4 is completely inserted into the catheter 2.

[0034] S3, continue to pull the guide wire 5 to extract it; at this time, since the uterine cavity stent 4 is blocked by the fixing ring 21 and cannot move forward, the guide wire is further pulled forward to extract it.

[0035] S4, insert the push rod 3 from the other end of the catheter 2;

[0036] S5, gradually push the push rod 3 to push the uterine cavity stent 4 out of one end of the catheter 2, and the uterine cavity stent 4 returns to a spiral shape. The push rod 3 pushes the uterine cavity stent 4 to move outward, and the pushed out part of the uterine cavity stent 4 returns to a spiral shape due to its own elasticity until it is completely pushed out.

[0037] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A degradable intrauterine stent, characterized in that: It comprises a stent body, which is in a spiral shape and is made of a degradable elastomeric material.

2. A degradable intrauterine stent according to claim 1, characterized in that: A hollow guide wire channel is arranged inside the stent body, and the diameter of the stent body ranges from 1.5 cm to 2 cm.

3. The degradable intrauterine stent according to claim 1, characterized in that: The material of the stent body is made of PLACL, PGACL, PGATMC or other degradable elastomeric materials.

4. A degradable intrauterine stent pushing device, characterized in that: It comprises a catheter, a push rod and a uterine cavity stent according to any one of claims 1 to 3, wherein the catheter is hollow and has openings at both ends, one end of the catheter is provided with a push rod, a uterine cavity stent is provided inside the catheter, and the push rod is used to push the uterine cavity stent out from the other end of the catheter.

5. The pushing device for a degradable intrauterine stent according to claim 4, characterized in that: The push rod is slidably connected to the catheter, the length of the push rod is greater than the length of the catheter, and the diameter of the push rod is greater than the diameter of the guide wire channel of the uterine cavity stent.

6. The pushing device for a degradable intrauterine stent according to claim 4, characterized in that: A handle is provided at one end of the push rod.

7. The pushing device for a degradable intrauterine stent according to claim 4, characterized in that: The catheter is provided with a fixing ring, and the inner diameter of the fixing ring is smaller than the diameter of the uterine cavity support.

8. The pushing device for a degradable intrauterine stent according to claim 7, characterized in that: The push rod is provided with a protrusion, and the diameter of the protrusion is larger than the inner diameter of the fixing ring.

9. A method for using a degradable intrauterine stent, characterized in that: The uterine cavity stent used in claims 1-3 comprises the following steps: straightening the uterine cavity stent and inserting it from one end of the catheter; inserting a push rod from the other end of the catheter; gradually pushing the push rod to push the uterine cavity stent out from one end of the catheter, and the uterine cavity stent returns to a spiral shape.

10. The method for using a degradable intrauterine stent according to claim 9, characterized in that: The straightening of the uterine cavity stent and inserting it through one end of the catheter comprises: straightening the uterine cavity stent by passing a guide wire through the uterine cavity stent, passing one end of the guide wire through the catheter, pulling the guide wire to gradually pull the uterine cavity stent into the catheter; and continuing to pull the guide wire to extract the guide wire.

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