CN111282141B - Disposable injection type cervical dilator - Google Patents

Abstract

The invention relates to a disposable injection type cervical dilating rod, which comprises a uterine dilating head, a liquid guide connecting rod and an injection connecting head, wherein a liquid guide hole groove is arranged in the liquid guide connecting rod in a penetrating manner along the length direction, the injection connecting head and the uterine dilating head are respectively arranged at two ends of the liquid guide connecting rod, the uterine dilating head comprises a hydrophobic liquid guide head and a hydrophilic dilating head, the hydrophobic liquid guide head is arranged at one end of the liquid guide connecting rod far away from the injection connecting head, a liquid discharge groove communicated with the liquid guide hole groove is arranged in the hydrophobic liquid guide head in a penetrating manner along the length direction, the hydrophilic dilating head is arranged on the outer peripheral wall of the hydrophobic liquid guide head, and one end of the injection connecting head far away from the liquid guide connecting rod is connected with an injector. The cervical canal dilator can ensure that the cervical canal can be heated and dilated within 30 seconds, is safe, has obvious effect, and effectively relieves the pain of patients.

Description

Disposable injection type cervical dilator

Technical Field

The invention relates to the technical field of medical instruments, in particular to a disposable injection type cervical dilating rod.

Background

In gynecological examination and operation, cervical dilatation is the most common operation item and is also the premise of various uterine cavity examination, operation and labor induction; the conventional uterine dilatation modes comprise a medicine mode and a physical mode, and a mechanical forced dilatation device and a hydrophilic cervical dilator are mainly adopted for the physical uterine dilatation.

The mechanical forced dilator is repeatedly inserted into the cervix from small to large in sequence in the dilating process, so that capillaries on the surface of the cervix are easy to rupture and cause intrauterine infection, the pain of a patient is increased, and even the uterine perforation, the induced abortion syndrome and the like are caused.

The common hydrophilic cervical dilator is provided with a seaweed dilating stick, the seaweed dilating stick is placed in a cervical canal and then expands by absorbing water in cervical secretion so as to dilate the cervical canal, however, the seaweed dilating stick is placed 12 hours earlier, and after the seaweed dilating stick is placed in the cervix, sterile dry gauze is stuffed into the seaweed dilating stick, so that the movement of a patient is reduced, and the dilation stick is prevented from falling off; the algae stick is generally required to be taken out within 24 hours, and the action is gentle when the algae stick is taken out, so that the expansion stick is prevented from being broken, and part of the expansion stick is left in the uterine cavity; the seaweed stick needs to be expanded for a long time, so that the infection of the uterine cavity is easily caused, and the risk of the operation is caused by the easy breakage of the seaweed stick.

Therefore, in order to solve the problems of long expansion time and easy infection of the existing expansion rod, the invention provides the cervix expansion rod capable of rapidly absorbing water and expanding, which not only avoids complications such as cervical laceration, infection and the like caused by the traditional metal expansion rod, but also has short expansion time.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a disposable injection type cervical dilating rod, which can ensure that a cervical canal can be dilated within 30 seconds by utilizing the water absorption swelling principle of the material, is safe and obvious in effect, effectively relieves the pain of a patient, and avoids the complications of cervical laceration, infection and the like caused by the step of gradually increasing the size of the cervical canal for dilating the cervical canal and the repeated and repeated putting in and pulling out of the traditional metal dilating rod.

The above object of the present invention is achieved by the following technical solutions:

disposable injection formula cervical dilator, even stick and injection are even headed including expanding palace head, drain, lead in the liquid even stick and run through along length direction and be provided with drain hole groove, the injection is even first and expand the palace head and set up respectively at the both ends that the drain is even excellent, expand the first hydrophobic drain head and hydrophilic expansion head of drawing together of uterus, hydrophobic drain sets up the one end of keeping away from the injection even head at drain even stick, it is provided with and leads the communicating fluid-discharge tank of liquid hole groove to run through along length direction in the hydrophobic drain head, hydrophilic expansion head sets up on the periphery wall of hydrophobic drain head, the injection is even first to keep away from the one end that the drain is even excellent and is connected with the syringe.

By adopting the technical scheme, the injection connecting head is connected with the injector, after the uterine dilating head is placed into the cervix by the liquid guide connecting rod, the physiological saline or the sugar saline can be input into the cervix through the liquid guide hole groove and the liquid discharge groove, and then the hydrophilic dilating head can quickly absorb the physiological saline and the sugar saline to quickly enlarge the volume, so that the cervical canal can be dilated in 30 seconds by utilizing the water absorption and expansion principle of the material, the invention is safe and remarkable in effect, effectively relieves the pain of a patient, and avoids the complications of cervical laceration, infection and the like caused by the step of gradually increasing the size of the traditional metal dilating rod for dilating the cervix and the repeated putting in and pulling out of the traditional metal dilating rod.

The invention is further set that the hydrophilic expansion head comprises an expansion internal material and an elastic protective film, the end wall of the elastic protective film is fixedly arranged on the peripheral wall of the hydrophobic liquid guide head, a containing cavity is formed between the elastic protective film and the peripheral wall of the hydrophobic liquid guide head, the expansion internal material is arranged in the containing cavity, and the elastic protective film is provided with water absorption micropores in a penetrating manner.

Through adopting above-mentioned technical scheme, normal saline and sugar salt solution enter into holding the intracavity via the micropore that absorbs water to material inflation that absorbs water in the expansion, simultaneously, elastic deformation takes place for the elasticity cuticula, and when not influencing the material inflation in the expansion, to material formation enclosure in the expansion, the damage of material in avoiding the expansion.

The invention is further provided with a hydrophobic smooth layer on one side of the elastic protective film far away from the cavity.

By adopting the technical scheme, the friction force between the surface of the expansion rod and the cervix is reduced, the damage of the inner wall of the cervix is reduced, and the hydrophobic performance of the hydrophobic smooth layer can further promote the introduction of physiological saline and saline into the water absorption micropores, so that the water absorption speed of the expansion inner material is improved.

The invention is further provided with an elastic sealing press ring at one end of the inner peripheral wall of the injection connecting head, which is far away from the liquid guide connecting rod, and the inner peripheral wall of the sealing press ring is elastically abutted with the outer peripheral wall of the injection head of the injector.

Through adopting above-mentioned technical scheme, elastic deformation takes place for sealed clamping ring and compresses tightly with the injection head of syringe to realize that the injection even can dismantle between first and the syringe and be connected conveniently.

The invention is further provided that the raw materials of the liquid guide connecting rod and the injection connecting head comprise the following components in parts by weight: 23-45 parts of polyethylene, 20-44 parts of polypropylene, 31-47 parts of oxidized polyethylene wax and 15-23 parts of titanium powder.

By adopting the technical scheme, polyethylene and polypropylene are used as high polymer materials, the price is low, the high polymer materials are safe and non-toxic, meanwhile, the high polymer materials have good mechanical properties, the requirement on the mechanical strength of the expansion head is met, oxidized polyethylene wax is used as an excellent novel polar wax with a certain amount of carbonyl and hydroxyl on a molecular chain, the oxidized polyethylene wax can be well mixed with the polyethylene and the polypropylene, the excellent internal and external lubricating properties of the oxidized polyethylene wax are utilized, the smoothness of the surfaces of a drainage connecting rod and an injection connecting head is improved, and the harm to the inner wall of a cervix is reduced; the titanium powder is used as a rare metal, improves the strength of the drainage connecting rod and the injection connecting head, has good affinity to the human body, and reduces the occurrence of the allergic problem of the human body.

The invention is further provided that the expanding inner material comprises the following components in parts by weight: 30-40 parts of croscarmellose sodium, 21-34 parts of potassium polyacrylate, 19-32 parts of polyethylene oxide and 20-36 parts of gelatin sponge;

the elastic protective film comprises the following raw materials in parts by weight: 23-46 parts of natural latex, 10-17 parts of linear low-density polyethylene and 2-6 parts of soybean lecithin.

By adopting the technical scheme, the croscarmellose sodium is used as a non-toxic and non-irritant material and has good rapid water absorption and expansion properties, so that the requirement on water absorption and expansion of the expansion inner material can be well met by using the croscarmellose sodium as a base material of the expansion inner material; the potassium polyacrylate is used as a water-absorbent resin, can absorb water to swell, simultaneously has good water retention effect after forming gel after absorbing water, and can reduce the overflow of physiological saline and sugar saline when the expansion rod is taken out; the addition of the polyoxyethylene is to utilize the self complexing action to perform complexing on sodium chloride and the like of physiological saline and sugar saline, thereby reducing the influence of the sodium chloride and the like on the water absorption performance of the croscarmellose sodium and the potassium polyacrylate due to the counter ion action and simultaneously playing a solubilizing effect; according to the invention, the gelatin sponge is added to act as a supporting matrix, so that the discomfort of a human body caused by irregular deformation of potassium polyacrylate, croscarmellose sodium and polyethylene oxide is avoided, and the gelatin sponge is used as a water-absorbing sponge-like object with light, soft and porous quality, so that the water absorption effect of the expanded inner material can be further improved;

for the elastic protective film, the natural latex has good film-forming property and elasticity, and can provide space for expanding the deformation of the inner material, meanwhile, the toughness of the elastic protective film can be further improved by adding the linear low-density polyethylene, and the oxidation resistance of the elastic protective film is improved by utilizing the self-oxidation property of the soybean lecithin.

The invention is further provided that the hydrophobic smooth layer comprises the following components in parts by weight: 23-37 parts of polydimethylsiloxane, 34-56 parts of ethylene-vinyl acetate copolymer and 15-23 parts of rosin ester.

By adopting the technical scheme, the ethylene-vinyl acetate copolymer has certain elasticity as a high molecular polymer material and can deform along with the elastic protective film, the polydimethylsiloxane is used as a hydrophobic main body, and the rosin ester improves the film forming property and the smoothness of the hydrophobic smooth layer, and can be well adhered to natural latex so as to improve the adhesion strength of the hydrophobic smooth layer on the elastic protective film.

The invention is further provided that the hydrophobic liquid guide head comprises the following raw materials in parts by weight: 20-26 parts of polyethylene, 18-26 parts of polypropylene, 16-20 parts of oxidized polyethylene wax and 18-23 parts of polydimethylsiloxane.

By adopting the technical scheme, polyethylene and polypropylene are used as high polymer materials, the price is low, the polyethylene and the polypropylene are safe and non-toxic, the polyethylene and the polypropylene have good mechanical properties and meet the requirement on the mechanical strength of the expansion head, oxidized polyethylene wax is used as a good novel polar wax with a certain amount of carbonyl and hydroxyl on a molecular chain, the oxidized polyethylene wax can be well mixed with the polyethylene and the polypropylene, and the addition of polydimethylsiloxane meets the hydrophobic property of the hydrophobic liquid guide head.

The invention is further configured in that the preparation method of the expanded inner material comprises the following steps:

powder mixing: placing the croscarmellose sodium, the potassium polyacrylate and the polyoxyethylene into a ball mill, and performing ball milling for 5-6 hours to obtain a mixed material;

preparing an inner material: and placing the mixed material and the gelatin sponge in the same container, and mechanically vibrating the container to enable the mixed material to be embedded into the pores of the gelatin sponge, so as to obtain the expanded inner material.

By adopting the technical scheme, the cross-linked sodium carboxymethyl cellulose, the potassium polyacrylate and the polyethylene oxide can be well and uniformly mixed together through ball milling, and finally, the cross-linked sodium carboxymethyl cellulose, the potassium polyacrylate and the polyethylene oxide can be conveniently and fast embedded into the gelatin sponge through mechanical vibration.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the cervical dilator can input physiological saline or sugar saline into a cervix through the drainage hole groove and the drain groove, and then the hydrophilic dilating head can quickly absorb the physiological saline and the sugar saline to quickly enlarge the volume, so that the cervical dilator can make the cervical canal dilate and safe within 30 seconds by utilizing the water absorption and expansion principle of the material, has obvious effect, effectively relieves the pain of a patient, and avoids the complications of cervical laceration, infection and the like caused by the step of gradually increasing the size of the cervix for dilating the traditional metal dilating rod and the repeated insertion and extraction

2. In the expanding inner material, the croscarmellose sodium and the potassium polyacrylate can well play a role in water absorption and expansion, and the potassium polyacrylate also has a good water retention effect; meanwhile, polyethylene oxide carries out complexation on sodium chloride and the like of physiological saline water and sugar saline water, thereby reducing the influence of the sodium chloride and the like on the water absorption performance of the croscarmellose sodium and the potassium polyacrylate due to the action of counter ions and simultaneously playing a solubilizing effect; the gelatin sponge is used as a water-absorbing sponge-like object with light, soft and porous quality, so that the water absorption effect of the expanding inner material can be further improved.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Figure 2 is a cross-sectional view of a structure embodying the present invention.

Fig. 3 is an enlarged view of a point a in fig. 2.

Reference numerals: 1. a uterine dilating head; 11. a hydrophobic liquid-conducting head; 111. a liquid discharge tank; 12. a hydrophilic expansion head; 121. expanding the inner material; 122. an elastic protective film; 1221. a cavity; 1222. water-absorbing micropores; 1223. a hydrophobic smoothing layer; 2. liquid guiding connecting rod; 21. a drainage hole groove; 3. injection connecting head; 31. sealing the pressure ring; 4. a syringe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

the invention discloses a disposable injection type cervical dilating rod, which comprises a uterine dilating head 1, a liquid guiding connecting rod 2 and an injection connecting head 3, wherein the liquid guiding connecting rod 2 is internally provided with a liquid guiding hole groove 21 in a penetrating manner along the length direction, the injection connecting head 3 and the uterine dilating head 1 are respectively arranged at two ends of the liquid guiding connecting rod 2, and meanwhile, in the embodiment, one end of the uterine dilating head 1, which is far away from the liquid guiding connecting rod 2, is distorted by 25 degrees and gradually becomes thinner; the uterine dilator head 1 comprises a hydrophobic liquid guide head 11 and a hydrophilic dilating head 12, the hydrophobic liquid guide head 11 is arranged at one end of a liquid guide connecting rod 2 far away from an injection connecting head 3, a liquid discharge groove 111 communicated with a liquid guide hole groove 21 is arranged in the hydrophobic liquid guide head 11 in a penetrating manner along the length direction, the hydrophilic dilating head 12 is arranged on the peripheral wall of the hydrophobic liquid guide head 11, and one end of the injection connecting head 3, far away from the liquid guide connecting rod 2, of the inner peripheral wall is provided with an elastic sealing press ring 31. When the cervical dilator is used, firstly, the vagina is dilated by the vaginal retractor, the cervix is exposed, the vagina and the cervix are disinfected conventionally, 10 ml of normal saline or saline is extracted by a 10 ml syringe 4, an injection head of the syringe 4 is inserted into the injection connecting head 3, the sealing press ring 31 is pressed against the injection head of the syringe 4, then the uterine dilating head 1 is placed into the uterine cervix, 10 ml of normal saline or saline is injected slowly, and after about 30 seconds, the hydrophilic dilating head 12 absorbs water and expands, and then the uterine dilating head 1 is taken out.

As shown in fig. 2 and fig. 3, in the present embodiment, the hydrophilic expansion head 12 includes an expansion inner 121 and an elastic protection film 122, an end wall of the elastic protection film 122 is glued to the outer peripheral wall of the hydrophobic liquid guide head 11, so that a cavity 1221 is formed between the elastic protection film 122 and the outer peripheral wall of the hydrophobic liquid guide head 11, the expansion inner 121 can be embedded in the cavity 1221, meanwhile, a water absorbing micro-hole 1222 is arranged on the elastic protection film 122 in a penetrating manner, and a hydrophobic smooth layer 1223 is arranged on a side of the elastic protection film 122 away from the cavity 1221; after the uterine dilating head 1 is inserted into the cervix, under the hydrophobic repulsion action of the hydrophobic smooth layer 1223 and the liquid absorption action of the dilating implant 121, the physiological saline and the sugar saline can rapidly enter the accommodating cavity 1221 through the water absorption micropores 1222, so that the dilating implant 121 can absorb the physiological saline or the sugar saline and become large, meanwhile, the elastic protective film 122 becomes large accordingly, and in the process of taking out the uterine dilating head 1, the hydrophobic smooth layer 1223 reduces the scraping of the uterine dilating head 1 on the inner wall of the cervix.

Example two:

the disposable injection type cervical dilation bar comprises the following raw materials in parts by weight: 23 parts of polyethylene, 20 parts of polypropylene, 36 parts of oxidized polyethylene wax and 16 parts of titanium powder.

The hydrophobic liquid guide head comprises the following raw materials in parts by weight: 21 parts of polyethylene, 20 parts of polypropylene, 16 parts of oxidized polyethylene wax and 18 parts of polydimethylsiloxane.

The expanding inner material comprises the following raw materials in parts by weight: 30 parts of croscarmellose sodium, 21 parts of potassium polyacrylate, 22 parts of polyethylene oxide and 3 parts of gelatin sponge.

The elastic protective film comprises the following raw materials in parts by weight: 26 parts of natural latex, 12 parts of linear low-density polyethylene and 2 parts of soybean lecithin.

The hydrophobic smooth layer comprises the following raw materials in parts by weight: 23 parts of polydimethylsiloxane, 34 parts of ethylene-vinyl acetate copolymer and 18 parts of rosin ester.

Example three:

the disposable injection cervical dilating rod, the drainage connecting rod and the injection connecting head comprise the following raw materials in parts by weight: 25 parts of polyethylene, 26 parts of polypropylene, 31 parts of oxidized polyethylene wax and 15 parts of titanium powder.

The hydrophobic liquid guide head comprises the following raw materials in parts by weight: 20 parts of polyethylene, 18 parts of polypropylene, 17 parts of oxidized polyethylene wax and 19 parts of polydimethylsiloxane.

The expanding inner material comprises the following raw materials in parts by weight: 32 parts of croscarmellose sodium, 25 parts of potassium polyacrylate, 19 parts of polyethylene oxide and 20 parts of gelatin sponge.

The elastic protective film comprises the following raw materials in parts by weight: 23 parts of natural latex, 10 parts of linear low-density polyethylene and 3 parts of soybean lecithin.

The hydrophobic smooth layer comprises the following raw materials in parts by weight: 26 parts of polydimethylsiloxane, 38 parts of ethylene-vinyl acetate copolymer and 15 parts of rosin ester.

Example four:

the disposable injection cervical dilating rod, the drainage connecting rod and the injection connecting head comprise the following raw materials in parts by weight: 40 parts of polyethylene, 36 parts of polypropylene, 41 parts of oxidized polyethylene wax and 18 parts of titanium powder.

The hydrophobic liquid guide head comprises the following raw materials in parts by weight: 23 parts of polyethylene, 22 parts of polypropylene, 18 parts of oxidized polyethylene wax and 20 parts of polydimethylsiloxane.

The expanding inner material comprises the following raw materials in parts by weight: 35 parts of croscarmellose sodium, 29 parts of potassium polyacrylate, 25 parts of polyethylene oxide and 32 parts of gelatin sponge.

The elastic protective film comprises the following raw materials in parts by weight: 38 parts of natural latex, 14 parts of linear low-density polyethylene and 5 parts of soybean lecithin.

The hydrophobic smooth layer comprises the following raw materials in parts by weight: 29 parts of polydimethylsiloxane, 41 parts of ethylene-vinyl acetate copolymer and 18 parts of rosin ester.

Example five:

the disposable injection cervical dilating rod, the drainage connecting rod and the injection connecting head comprise the following raw materials in parts by weight: 45 parts of polyethylene, 44 parts of polypropylene, 46 parts of oxidized polyethylene wax and 22 parts of titanium powder.

The hydrophobic liquid guide head comprises the following raw materials in parts by weight: 25 parts of polyethylene, 24 parts of polypropylene, 20 parts of oxidized polyethylene wax and 23 parts of polydimethylsiloxane.

The expanding inner material comprises the following raw materials in parts by weight: 40 parts of croscarmellose sodium, 34 parts of potassium polyacrylate, 30 parts of polyethylene oxide and 33 parts of gelatin sponge.

The elastic protective film comprises the following raw materials in parts by weight: 44 parts of natural latex, 15 parts of linear low-density polyethylene and 6 parts of soybean lecithin.

The hydrophobic smooth layer comprises the following raw materials in parts by weight: 37 parts of polydimethylsiloxane, 56 parts of ethylene-vinyl acetate copolymer and 22 parts of rosin ester.

Example six:

the disposable injection cervical dilating rod, the drainage connecting rod and the injection connecting head comprise the following raw materials in parts by weight: 44 parts of polyethylene, 42 parts of polypropylene, 47 parts of oxidized polyethylene wax and 23 parts of titanium powder.

The hydrophobic liquid guide head comprises the following raw materials in parts by weight: 26 parts of polyethylene, 26 parts of polypropylene, 18 parts of oxidized polyethylene wax and 22 parts of polydimethylsiloxane.

The expanding inner material comprises the following raw materials in parts by weight: 38 parts of croscarmellose sodium, 33 parts of potassium polyacrylate, 32 parts of polyethylene oxide and 36 parts of gelatin sponge.

The elastic protective film comprises the following raw materials in parts by weight: 46 parts of natural latex, 17 parts of linear low-density polyethylene and 5 parts of soybean lecithin.

The hydrophobic smooth layer comprises the following raw materials in parts by weight: 36 parts of polydimethylsiloxane, 54 parts of ethylene-vinyl acetate copolymer and 23 parts of rosin ester.

Example seven:

the preparation method of the expansion lining comprises the following steps:

powder mixing: placing the crosslinked sodium carboxymethylcellulose, the potassium polyacrylate and the polyoxyethylene into a ball mill, and performing ball milling for 5-6 hours to obtain a mixed material;

preparing an inner material: placing the mixed material and the gelatin sponge in the same container, and mechanically vibrating the container for 20 minutes at a frequency of 12000 times/min to embed the mixed material into the pores of the gelatin sponge to obtain the expanded internal material.

Comparative example one:

compared with the two phases of the example, no potassium polyacrylate is added.

Comparative example two:

compared to the two phases of the example, no gelatin sponge was added.

Comparative example three:

in contrast to the two phases of the examples, no polyethylene oxide was added.

Comparative example four:

compared with the two examples, no rosin ester is added.

Comparative example five:

a seaweed spreader bar was used as a comparative example.

Comparative example six:

a commercially available cervical dilator was used as a comparative example.

And (3) performance detection:

preparing a drainage connecting rod and an injection connecting head:

stirring polyethylene, polypropylene, oxidized polyethylene wax and titanium powder at 180 ℃ for 40 minutes at the rotating speed of 200 revolutions per minute, then pouring the slurry into a mold, and carrying out injection molding.

Preparation of a hydrophobic liquid guide head:

stirring polyethylene, polypropylene, oxidized polyethylene wax and polydimethylsiloxane at 160 ℃ for 30 minutes at a rotating speed of 180 revolutions per minute, then pouring the slurry into a mold, and carrying out injection molding.

Preparation of hydrophobic smoothing layer:

the polydimethylsiloxane, the ethylene-vinyl acetate copolymer and the rosin ester are stirred for 50 minutes at the temperature of 200 ℃ at the rotating speed of 230 revolutions per minute to obtain slurry.

Preparing an elastic protective film:

stirring natural latex, linear low-density polyethylene and soybean lecithin in a nitrogen environment at the temperature of 150 ℃ for 30 minutes at the rotating speed of 150 revolutions per minute, then blowing the slurry into a film, then coating the slurry of a hydrophobic smooth layer on the surface of the film, and finally pressing water-absorbing micropores on the film.

Preparation of the expansion rod:

gluing the liquid guide connecting rod and the injection connecting head, wrapping the expansion inner material by using the elastic protective film, gluing the end wall of the elastic protective film on the end wall of the hydrophobic liquid guide connecting head, gluing the end wall of the hydrophobic liquid guide connecting rod at one end of the liquid guide connecting rod far away from the injection connecting head, and gluing the elastic compression ring in the injection connecting head.

According to the preparation method, corresponding samples are prepared according to the raw materials of the second to sixth examples and the first to fourth comparative examples, and relevant performance tests are carried out together with the fifth comparative example and the sixth comparative example.

TABLE 1

Performance of	Example two	EXAMPLE III	Example four	EXAMPLE five	EXAMPLE six
						Type of absorption liquid	Physiological saline	Physiological saline	Physiological saline	Physiological saline	Physiological saline
Absorption time	30 seconds	30 seconds	25 seconds	29 seconds	31 seconds
						Expansion volume	4 times of	3 times of	4 times of	3 times of	4 times of
Appearance of expansion segment	Smooth and smooth	Smooth and smooth	Smooth and smooth	Smooth and smooth	Smooth and smooth

TABLE 2

Performance of	Example two	EXAMPLE III	Example four	EXAMPLE five	Example six
						Type of absorption liquid	Physiological saline	Physiological saline	Physiological saline	Physiological saline	Physiological saline
Absorption time	30 seconds	30 seconds	25 seconds	29 seconds	31 second
						Expansion volume	4 times of	3 times of	4 times of	3 times of	4 times of
Appearance of expansion segment	Is smooth and smooth	Is smooth and smooth	Is smooth and smooth	Is smooth and smooth	Smooth and smooth

As the result of the detection shows, the uterine dilating rod of the invention can make the cervical canal dilate in 30 seconds by utilizing the water absorption and expansion principle of the material, thereby not only avoiding the complications of cervical laceration, infection and the like caused by the step of gradually increasing the size of the traditional metal dilating rod for dilating the cervix and the repeated putting in and pulling out of the traditional metal dilating rod, but also being safe, remarkable in effect and capable of effectively relieving the pain of patients.

The embodiments of the present invention are all preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (6)

1. Disposable injection type cervical dilating rod, its characterized in that: the uterus dilating instrument comprises a uterus dilating head (1), a liquid guiding connecting rod (2) and an injection connecting head (3), wherein a liquid guiding hole groove (21) penetrates through the liquid guiding connecting rod (2) along the length direction, the injection connecting head (3) and the uterus dilating head (1) are respectively arranged at two ends of the liquid guiding connecting rod (2), the uterus dilating head (1) comprises a hydrophobic liquid guiding head (11) and a hydrophilic dilating head (12), the hydrophobic liquid guiding head (11) is arranged at one end, far away from the injection connecting head (3), of the liquid guiding connecting rod (2), a liquid discharge groove (111) communicated with the liquid guiding hole groove (21) penetrates through the hydrophobic liquid guiding head (11) along the length direction, the hydrophilic dilating head (12) is arranged on the outer peripheral wall of the hydrophobic liquid guiding head (11), and one end, far away from the liquid guiding connecting rod (2), of the injection connecting head (3) is connected with an injector (4);

the hydrophilic expansion head (12) comprises an expansion internal material (121) and an elastic protective film (122), the end wall of the elastic protective film (122) is fixedly arranged on the peripheral wall of the hydrophobic liquid guide head (11), a containing cavity (1221) is formed between the elastic protective film (122) and the peripheral wall of the hydrophobic liquid guide head (11), the expansion internal material (121) is arranged in the containing cavity (1221), and a water absorption micropore (1222) is arranged on the elastic protective film (122) in a penetrating mode;

the liquid guide connecting rod (2) and the injection connecting head (3) comprise the following raw materials in parts by weight: 23-45 parts of polyethylene, 20-44 parts of polypropylene, 31-47 parts of oxidized polyethylene wax and 15-23 parts of titanium powder;

the expanding inner material (121) comprises the following raw materials in parts by weight: 35 parts of croscarmellose sodium, 29 parts of potassium polyacrylate, 25 parts of polyethylene oxide and 32 parts of gelatin sponge;

the elastic protective film (122) comprises the following raw materials in parts by weight: 23-46 parts of natural latex, 10-17 parts of linear low-density polyethylene and 2-6 parts of soybean lecithin.

2. The disposable injection-type cervical dilating rod of claim 1, wherein: and a hydrophobic smooth layer (1223) is arranged on one side of the elastic protective film (122) far away from the containing cavity (1221).

3. The disposable injection-type cervical dilating rod of claim 1, wherein: one end of the inner peripheral wall of the injection connecting head (3) far away from the liquid guide connecting rod (2) is provided with an elastic sealing press ring (31), and the inner peripheral wall of the sealing press ring (31) is elastically abutted to the outer peripheral wall of the injection head of the injector (4).

4. The disposable injection-type cervical dilating rod of claim 2, wherein: the hydrophobic smooth layer (1223) comprises the following raw materials in parts by weight: 23-37 parts of polydimethylsiloxane, 34-56 parts of ethylene-vinyl acetate copolymer and 15-23 parts of rosin ester.

5. The disposable injection-type cervical dilating rod of claim 1, wherein: the hydrophobic liquid guide head (11) comprises the following raw materials in parts by weight: 20-26 parts of polyethylene, 18-26 parts of polypropylene, 16-20 parts of oxidized polyethylene wax and 18-23 parts of polydimethylsiloxane.

6. The disposable injection-type cervical dilating rod of claim 1, wherein: the preparation method of the expansion lining (121) comprises the following steps:

powder mixing: placing the crosslinked sodium carboxymethylcellulose, the potassium polyacrylate and the polyoxyethylene into a ball mill, and performing ball milling for 5-6 hours to obtain a mixed material;

preparing an inner material: and placing the mixed material and the gelatin sponge into the same container, and mechanically vibrating the container to enable the mixed material to be embedded into the pores of the gelatin sponge to obtain the expanded inner material (121).

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