CN111437029B - Cold-freezing therapeutic device in scar and control method thereof - Google Patents

Abstract

The invention provides a cold-freezing treatment device in scars, wherein a through hole is formed in a shell, a driving piece and a needle tube assembly are arranged in the shell, and the driving piece is used for driving the tip end of the needle tube assembly to extend out of the shell or move back into the shell through the through hole. The needle tube assembly comprises an injection tube, and the injection tube is provided with a liquid nitrogen input port, a liquid nitrogen injection port and an exhaust port; or the needle tube assembly comprises an injection tube and an exhaust tube which are arranged side by side, the injection tube is provided with a liquid nitrogen input port and a liquid nitrogen injection port, and the exhaust tube is provided with a vent hole; or the needle tube assembly comprises a large needle tube and a small needle tube which are sleeved with each other, one of the large needle tube and the small needle tube is an injection tube, the other one of the large needle tube and the small needle tube is an exhaust tube, the injection tube is provided with a liquid nitrogen input port and a liquid nitrogen injection port, and the exhaust tube is provided with a vent hole. The invention also provides a control method of the device for treating the cold in the scar. The invention can realize the precise cryotherapy of scar tissues, prevent the complications of the traditional scar surface cryotherapy, improve the treatment comfort and reduce the recurrence rate of the scar treatment.

Description

Cold-freezing therapeutic device in scar and control method thereof

Technical Field

The invention relates to the technical field of medical instruments, in particular to an in-scar freezing treatment device and a control method thereof.

Background

Scarring is the natural sequelae of any wound that heals the wound by increasing the deposition and attachment of collagen fibers in the dermis. Certain body parts, including hands, back, shoulders, etc., are particularly susceptible to the development of abnormal scars, known as hypertrophic scars or keloids. Such skin lesions generally protrude from the skin surface, where dermal collagen fibers are heavily deposited. They have the same clinical manifestations: the skin lesions appeared red, convex, firm and smooth in surface. While hypertrophic scar tissue spontaneously flattens itself over one to several years, keloid scars often continue to grow and exceed the site of the original wound. Patients with hypertrophic scars or keloids may experience pain, itching and local sensitivity, and these discomfort may affect the quality of life and personal appearance of the patient.

Current treatments for hypertrophic scars or keloids remain challenging. Existing treatment methods include: topical application of silicone gel, compression therapy, topical corticosteroid hormone or interferon injection, surface cryotherapy, radiation therapy, laser therapy, and surgical resection. However, these treatments are not ideal and the recurrence rate after treatment is relatively high. The surface freezing treatment method directly sprays liquid nitrogen on the surface of hyperplastic scar or keloid skin, and a freezing probe or a cotton swab stained with liquid nitrogen can be directly pressed on an affected part. The disadvantages of this method of treatment are the lack of depth of treatment and the relatively shallow range of action, resulting in a relatively high recurrence rate of the treatment, the formation of ulcers which are prone to freezing on the surface of scar tissue, mild to moderate pain and redness and swelling of the patient during treatment, and the possibility of inflammation and pigmentation or loss after treatment.

Disclosure of Invention

The main purpose of the present invention is to propose a device for the treatment of cold in scars, aiming at solving at least one of the technical problems mentioned above.

In order to achieve the above object, the present invention provides an in-scar cryotherapy apparatus, comprising:

the device comprises a shell, a first fixing piece and a second fixing piece, wherein one end of the shell is provided with a through hole;

a driving member mounted to the housing; and the number of the first and second groups,

the needle tube assembly is arranged in the shell and is connected to the driving piece, and the driving piece is used for driving the tip end of the needle tube assembly to extend out of the shell or move back into the shell through the through hole; wherein,

the needle tube assembly comprises an injection tube, the injection tube is provided with a liquid nitrogen input port and an exhaust port, the liquid nitrogen input port is used for being communicated with a liquid nitrogen source, the exhaust port is used for exhausting gas in the injection tube, and the tip of the injection tube is also provided with a liquid nitrogen injection port; or,

the needle tube assembly comprises an injection tube and an exhaust tube which are arranged side by side, the tip of the injection tube and the tip of the exhaust tube jointly form a needle point, the injection tube is provided with a liquid nitrogen input port which is used for being communicated with a liquid nitrogen source, and the tip of the injection tube is also provided with a liquid nitrogen injection port; the exhaust pipe is provided with a first vent hole which is used for being communicated with the negative pressure suction device, and the tip of the exhaust pipe is also provided with a second vent hole; or,

the needle tube assembly comprises a large needle tube and a small needle tube, the large needle tube is sleeved on the periphery of the small needle tube, a cavity is formed between the large needle tube and the small needle tube, the tip of the large needle tube and the tip of the small needle tube jointly form a needle point, one of the large needle tube and the small needle tube is an injection tube, the other one of the large needle tube and the small needle tube is an exhaust tube, the injection tube is provided with a liquid nitrogen input port communicated with a liquid nitrogen source, and the tip of the injection tube is also provided with a liquid nitrogen injection port; the exhaust pipe is provided with a first vent hole used for being communicated with the negative pressure suction device, and the tip of the exhaust pipe is also provided with a second vent hole.

In one embodiment, the liquid nitrogen input port is arranged at the other end of the injection tube different from the tip end of the injection tube, and the exhaust port is arranged on the side wall of the injection tube.

In one embodiment, the large needle tube is an exhaust tube, the small needle tube is an injection tube, the liquid nitrogen input port is arranged at the other end of the needle tube different from the tip of the needle tube, and the other end of the exhaust tube different from the tip of the exhaust tube.

In one embodiment, the outer peripheral surface of the needle cannula assembly is provided with a heat insulating layer.

In an embodiment, the housing is a cylindrical structure, one end of the housing close to the tip end of the needle tube assembly is arranged in a tapered manner, a positioning portion is formed at the end of the housing in the tapered manner, the positioning portion is a planar structure, and the through opening is opened in the positioning portion.

In an embodiment, a base plate is further installed in the housing, the base plate has a first plate surface and a second plate surface which are opposite to each other, the driving member is connected to the first plate surface, the needle tube assembly is connected to the second plate surface, and the driving member is used for driving the base plate to move along the axial direction of the housing.

In an embodiment, the device for treating cold in scars further comprises a displacement sensor, and the displacement sensor is mounted on the base plate.

In one embodiment, the other end of the needle tube assembly, which is different from the tip end of the needle tube assembly, is further provided with a connecting buckle, and the needle tube assembly is detachably connected with the base plate through the connecting buckle.

The invention also provides a control method of the in-scar freezing treatment device, which is applied to the in-scar freezing treatment device and comprises the following steps:

obtaining the preset value S of the depth of the needle tube assembly penetrating into the scar tissue₀；

The driving piece is controlled to drive the needle tube component to move so as to prick scar tissue, and the moving distance is S₂，S₂＝S₀+S₁Wherein S is₁The distance between the tip end of the needle tube component and the through opening;

acquiring a preset value Q of single liquid nitrogen injection quantity and a preset value N of injection times of the needle tube assembly;

and controlling the needle tube assembly to inject liquid nitrogen into the scar tissue, wherein the injection amount of single liquid nitrogen is Q, and the injection times are N.

Further, the step of controlling the needle cannula assembly to inject liquid nitrogen into the scar tissue may be preceded by the steps of:

the exhaust port or exhaust pipe of the control needle tube assembly is communicated with the negative pressure suction device.

According to the technical scheme, the tip of the needle tube assembly can be driven by the driving piece to be pricked into the scar tissue, and the liquid nitrogen is directly acted on the core of the scar tissue through the liquid nitrogen injection port, so that the treatment depth of the scar tissue is deepened, the treatment effect is improved, and the recurrence rate of the scar is reduced; meanwhile, the direct action on the surface of scar tissue is avoided in the treatment process, so that the epidermal tissue of the scar is protected, the risks of ulcer and inflammation of a patient during treatment are reduced, and the quick rehabilitation of the patient is facilitated. In general, the invention can realize accurate cryotherapy of scar tissues, prevent complications of traditional scar surface cryotherapy, improve the treatment comfort and reduce the recurrence rate of scar treatment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of the cryotherapeutic device for the treatment of internal scars in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view of a needle cannula assembly according to an embodiment of the present invention;

FIG. 3 is a schematic view of a needle cannula assembly according to another embodiment of the present invention;

FIG. 4 is a schematic view of a needle cannula assembly according to yet another embodiment of the present invention;

FIG. 5 is another schematic view of the syringe assembly of FIG. 1

Fig. 6 illustrates a method for controlling the device for the cold treatment of scars shown in fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Shell body	110	Positioningpart
111	Throughhole	200	Driving member
				210	Electric machine	220	Driving rod
300	Needle tube assembly	310	Injection tube
				311	Liquidnitrogen input port	312	Liquidnitrogen injection port
313	Exhaust port	320	Exhaust pipe
				321	First vent	322	Second vent
400	Substrate	500	Connecting buckle

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The embodiment of the invention provides an internal scar freezing treatment device, and the internal scar freezing treatment device provided by the embodiment of the invention is specifically described with reference to fig. 1 to 4.

In one embodiment of the invention, the device for the treatment of cold in scars comprises:

ashell 100, wherein one end of theshell 100 is provided with athrough hole 111;

adriving member 200 mounted to thehousing 100; and the number of the first and second groups,

aneedle tube assembly 300 installed in thehousing 100 and connected to thedriving member 200, wherein thedriving member 200 is used for driving the tip of theneedle tube assembly 300 to extend out of thehousing 100 or move back into thehousing 100 through the throughhole 111; wherein,

theneedle tube assembly 300 comprises aninjection tube 310, theinjection tube 310 is provided with a liquidnitrogen input port 311 and anexhaust port 313, the liquidnitrogen input port 311 is used for being communicated with a liquid nitrogen source, theexhaust port 313 is used for being communicated with a negative pressure suction device, and the tip of theinjection tube 310 is further provided with a liquidnitrogen injection port 312; or,

theneedle tube assembly 300 comprises aninjection tube 310 and anexhaust tube 320 which are arranged side by side, the tip of theinjection tube 310 and the tip of theexhaust tube 320 form a needle point together, theinjection tube 310 is provided with a liquidnitrogen input port 311 used for being communicated with a liquid nitrogen source, and the tip of theinjection tube 310 is also provided with a liquidnitrogen injection port 312; theexhaust pipe 320 is provided with afirst vent hole 321 for communicating with a negative pressure suction device, and the tip of theexhaust pipe 320 is also provided with asecond vent hole 322; or,

theneedle tube assembly 300 comprises a large needle tube and a small needle tube, the large needle tube is sleeved on the periphery of the small needle tube, a cavity is formed between the large needle tube and the small needle tube, the tip of the large needle tube and the tip of the small needle tube jointly form a needle point, one of the large needle tube and the small needle tube is aninjection tube 310, the other one of the large needle tube and the small needle tube is anexhaust tube 320, theinjection tube 310 is provided with a liquidnitrogen input port 311 used for being communicated with a liquid nitrogen source, and the tip of theinjection tube 310 is also provided with a liquidnitrogen injection port 312; theexhaust pipe 320 is provided with afirst vent hole 321 for communicating with a negative pressure suction device, and asecond vent hole 322 is further provided at a tip of theexhaust pipe 320.

In the prior art, methods for treating scar tissue (including hypertrophic scars or keloids) include: topical application of silicone gel, compression therapy, topical corticosteroid hormone or interferon injection, surface cryotherapy, radiation therapy, laser therapy, and surgical resection. However, these treatments are not ideal and have a high recurrence rate after treatment. The surface freezing treatment method directly sprays liquid nitrogen on the surface of hyperplastic scar or keloid skin, and a freezing probe or a cotton swab stained with liquid nitrogen can be directly pressed on an affected part. The disadvantages of this method of treatment are the lack of depth of treatment and the relatively shallow range of action, resulting in a relatively high recurrence rate of the treatment, the formation of ulcers which are prone to freezing on the surface of scar tissue, mild to moderate pain and redness and swelling of the patient during treatment, and the possibility of inflammation and pigmentation or loss after treatment.

According to the technical scheme, the drivingpiece 200 drives the tip of theneedle tube assembly 300 to extend out of theshell 100, so that the tip of theneedle tube assembly 300 is inserted into scar tissue, liquid nitrogen is injected into the scar tissue (including hypertrophic scars or keloids) through theneedle tube assembly 300, an operator can adjust the insertion depth of theneedle tube assembly 300 according to experience values, the liquid nitrogen directly acts on a core part in the scar tissue, and blood vessels and cells in the scar tissue are subjected to a series of pathological changes such as ischemia, hypoxia and necrosis under the freezing action of the liquid nitrogen, so that the purpose of damaging the scar tissue is achieved, and the scar tissue can be remarkably reduced or eliminated.

Specifically, as shown in FIG. 2,needle cannula assembly 300 may includeonly syringe 310, with the tip ofsyringe 310 being provided with liquidnitrogen injection port 312 to inject liquid nitrogen into the scar tissue after the tip ofsyringe 310 penetrates the scar tissue.Syringe 310 is further provided with anexhaust port 313, andexhaust port 313 is used for exhausting the gas insyringe 310. Theair outlet 313 may be in communication with a negative pressure aspiration device so that air at the needle tip can be rapidly evacuated by opening the negative pressure aspiration device prior to injecting the liquid nitrogen, so that the liquid nitrogen can smoothly pass through the liquidnitrogen injection port 312 and be injected into the scar tissue. As shown in FIGS. 3 and 4, when thesyringe assembly 300 further includes aninjection tube 310 and anexhaust tube 320, theexhaust tube 320 is used to communicate with the vacuum suction device, and theexhaust tube 320 and theinjection tube 310 extend in the same direction and have the same tip orientation. It will be appreciated that theexhaust tube 320 and the tip of theinjection tube 310 will be inserted into the scar tissue, and the air at the needle tip can be quickly evacuated when theexhaust tube 320 is evacuated by the vacuum suction device. It should be noted that, during the process of injecting liquid nitrogen, the liquid nitrogen in thesyringe assembly 300 is partially vaporized into nitrogen gas, and theexhaust port 313 or theexhaust pipe 320 can also be used to exhaust the nitrogen gas in thesyringe assembly 300, so as to effectively reduce the air pressure in thesyringe assembly 300, thereby enabling the liquid nitrogen to smoothly enter theinjection pipe 310.

Wherein, if theneedle tube assembly 300 is composed of both theinjection tube 310 and theexhaust tube 320, as shown in fig. 3, theinjection tube 310 and theexhaust tube 320 can be arranged side by side, so that the tip of theinjection tube 310 and the tip of theexhaust tube 320 form a needle point together, when the tips of the two prick into scar tissue together, the liquidnitrogen injection port 312 is communicated with thesecond vent port 322, therefore, the air and nitrogen in theinjection tube 310 will be discharged through thesecond vent port 322 and thefirst vent port 321 in sequence;

as shown in FIG. 4, theneedle cannula assembly 300 may also be of a cannula configuration, i.e., a large needle cannula is sleeved over a small needle cannula. Specifically, the two needle tubes may share the same axial line, or may have different axial lines, and in addition, the tube walls of the two needle tubes may not be connected, or may be bonded on the same side, as long as a chamber is formed between the two needle tubes to allow liquid nitrogen or gas to pass through. In this embodiment, one of the large needle tube and the small needle tube is theinjection tube 310, and the other is theexhaust tube 320, that is, theexhaust tube 320 is sleeved on the periphery of theinjection tube 310, or theinjection tube 310 is sleeved on the periphery of theexhaust tube 320. When the tip ofneedle tube assembly 300 is inserted into scar tissue, the liquidnitrogen injection port 312 ofinjection tube 310 and thesecond vent port 322 ofvent tube 320 are naturally communicated, so that air and nitrogen ininjection tube 310 are discharged throughsecond vent port 322 andfirst vent port 321 in sequence.

According to the technical scheme, the tip of theneedle tube assembly 300 can be driven by the drivingpiece 200 to be pricked into scar tissue, and liquid nitrogen is directly acted on the core of the scar tissue through the liquidnitrogen injection port 312, so that the treatment depth of the scar tissue is deepened, the treatment effect is improved, and the recurrence rate of the scar is reduced; meanwhile, the direct action on the surface of scar tissue is avoided in the treatment process, so that the epidermal tissue of the scar is protected, the risks of ulcer and inflammation of a patient during treatment are reduced, and the quick rehabilitation of the patient is facilitated. In general, the invention can realize accurate cryotherapy of scar tissues, prevent complications of traditional scar surface cryotherapy, improve the treatment comfort and reduce the recurrence rate of scar treatment.

In one embodiment, as shown in FIG. 2, when thesyringe assembly 300 is a single tube, the liquidnitrogen injection port 312 is disposed at the tip of thesyringe 310, the liquidnitrogen input port 311 is disposed at the other end of thesyringe 310 different from the tip thereof, and theexhaust port 313 is disposed on the sidewall of thesyringe 310. Specifically, theliquid nitrogen inlet 311 and the liquid nitrogen source (liquid nitrogen device) may be connected by a conduit, and the conduit is made of stainless steel (the surface is covered with a heat insulating material) or a vacuum tube. Before injecting liquid nitrogen, theair outlet 313 is communicated with a negative pressure suction device to empty air in theinjection tube 310 in advance; thegas outlet 313 is closed when injecting liquid nitrogen, and thegas outlet 313 is opened after the injection is finished. According to the technical scheme of the embodiment, the liquidnitrogen input port 311 is arranged at the end part of theinjection tube 310, and theexhaust port 313 is arranged on the side wall of theinjection tube 310, so that interference between the liquidnitrogen input port 311 and theexhaust port 313 can be effectively avoided, and theneedle tube assembly 300 can be ensured to be capable of smoothly injecting liquid nitrogen. Theneedle tube assembly 300 of the embodiment is of a single-tube structure, simple and reliable in structure, low in manufacturing process difficulty and beneficial to improving the production efficiency.

In another embodiment, as shown in fig. 4, the large needle tube is anexhaust tube 320, the small needle tube is aninjection tube 310, that is, theexhaust tube 320 is sleeved on the periphery of theinjection tube 310, the liquidnitrogen injection port 312 is arranged at the tip of theinjection tube 310, and the liquidnitrogen input port 311 is arranged at the other end of theinjection tube 310 different from the tip thereof; thesecond vent hole 322 is provided at the tip end of theexhaust pipe 320, and thefirst vent hole 321 is provided at the other end of theexhaust pipe 320 different from the tip end thereof. Of course, in other embodiments, thefirst vent 321 may also be disposed on a sidewall of a chamber formed between theexhaust tube 310 and theinjection tube 320.

Further, the outer circumferential surface of theneedle tube assembly 300 is provided with a heat insulating layer (not shown in the drawings) to prevent the outer circumferential wall of theneedle tube assembly 300 from being excessively cold when injecting liquid nitrogen. Specifically, the entire outer surface of theneedle tube assembly 300 may be covered with a heat insulating layer, or the outer surface of theneedle tube assembly 300 other than the needle tip may be covered with a heat insulating layer. Wherein the thermal insulation layer is made of thermal insulation material which retards heat flow transmission, and the thermal insulation material includes but is not limited to glass fiber, asbestos, rock wool, silicate, foamed plastic and the like. The technical scheme of the embodiment sets up the heat insulation layer through the peripheral face atneedle tubing subassembly 300, can avoid the epidermis tissue of frostbite scar when treating to the condition of ulcer and inflammation appears in the patient during effective avoidance treatment.

Further, as shown in fig. 1, thehousing 100 is a cylindrical structure, one end of thehousing 100 close to the tip of theneedle tube assembly 300 is tapered, apositioning portion 110 is formed at the tapered end of thehousing 100, thepositioning portion 110 is a planar structure, and the throughhole 111 is opened in thepositioning portion 110. So set up, can be in scar treatment process, be convenient for the user to scar tissue carry out quick, accurate location to makeneedle tubing subassembly 300 can accurately prick scar tissue's core department.

Still installbase plate 400 in thecasing 100,base plate 400 has relative first face and the second face that sets up, and drivingpiece 200 connect in first face,needle tubing assembly 300 connects in the second face, and drivingpiece 200 is used for drivingbase plate 400 along the axial displacement ofcasing 100. The drivingmember 200 includes amotor 210 and a drivingrod 220, themotor 210 is connected to the drivingrod 220, and the drivingrod 220 is connected to thesubstrate 400. It will be appreciated that when thebase 400 is driven by the drivingmember 200 toward theopening 111, theneedle assembly 300 will move, such that the tip of theneedle assembly 300 extends out of thehousing 100 through theopening 111 and finally penetrates into the scar tissue. In this embodiment, since thesubstrate 400 can move along the axial direction of thehousing 100, thesubstrate 400 drives theneedle tube assembly 300 to move, which is beneficial for theneedle tube assembly 300 to stably move in the same direction, and can avoid the situation that theneedle tube assembly 300 is easily broken due to the direct connection between theneedle tube assembly 300 and the drivingmember 200.

Further, the device for treating the cold in the scar further comprises a displacement sensor (not shown in the figure), and the displacement sensor is mounted on thesubstrate 400. The displacement sensor is used for detecting the displacement of thesubstrate 400, which is equivalent to detecting the moving distance of theneedle tube assembly 300, so the displacement sensor can be used for feeding back the depth of theneedle tube assembly 300 inserted into the scar tissue.

Further, as shown in fig. 5, the other end of theneedle tube assembly 300, which is different from the tip end thereof, is further provided with a connecting buckle 500, and theneedle tube assembly 300 is detachably connected with thebase plate 400 through the connecting buckle 500. It will be appreciated that theneedle cannula assembly 300 may be removably mounted to thebase plate 400 to facilitate replacement of theneedle cannula assembly 300 by a user to avoid cross-contamination of the patient.

In one embodiment, the other end of theneedle tube assembly 300, different from the tip end thereof, is fixedly mounted in thebase plate 400, and thebase plate 400 is provided with two through holes, wherein one through hole is used as a liquid nitrogen inlet and is used for communicating with the liquidnitrogen input port 311 of theinjection tube 310; the other through hole is used as a nitrogen outlet for communicating with thefirst vent 321 of theexhaust pipe 320.

The embodiment of the present invention further provides a control method of an internal scar freezing treatment device, which is applied to the aforementioned internal scar freezing treatment device, and as shown in fig. 6, the control method includes the following steps:

s101, obtaining a preset value S of the depth of theneedle tube assembly 300 penetrating into scar tissue₀；

S102, controlling the drivingmember 200 to drive theneedle tube assembly 300 to move for pricking scar tissue, wherein the moving distance is S₂，S₂＝S₀+S₁Wherein S is₁The distance between the tip of theneedle assembly 300 and theport 111;

s103, acquiring a preset value Q of single liquid nitrogen injection quantity and a preset value N of injection times of theneedle tube assembly 300;

s104, controlling theneedle tube assembly 300 to inject liquid nitrogen into the scar tissue, wherein the injection amount of single liquid nitrogen is Q, and the injection times are N.

Specifically, the in-scar freezing device further comprises a controller and an interactive module, and a user can set a preset value S for the penetration depth of theneedle tube assembly 300 into scar tissue through the interactive module₀The controller then obtains a preset value S for the depth of penetration ofneedle cannula assembly 300 into scar tissue₀Then, the preset value S of the total moving distance of theneedle tube assembly 300 is calculated₂The preset value S₂Equal to the distance S between the tip of theneedle assembly 300 and theopening 111₁And a preset value S of the depth of penetration of theneedle cannula assembly 300 into scar tissue₂And (4) summing. Wherein the distance S between the tip of theneedle tube assembly 300 and the throughopening 111₁Which is the distance between the needle tip and the surface of the scar tissue when thepositioning part 110 of the therapeutic device is tightly attached to the surface of the tissue. Of course, if the tip of theneedle cannula assembly 300 is just flush with thepositioning portion 110, the preset value S of the moving distance of theneedle cannula assembly 300 is set₂Equal to the preset value S of the depth of theneedle tube assembly 300 penetrating into the scar tissue₀。

In addition, the user can also set a preset value Q of the single liquid nitrogen injection amount and a preset value N of the injection times of theneedle tube assembly 300 through the interaction module, after the internal scar freezing treatment device is started, the controller can obtain the preset value Q and the preset value N, and then theneedle tube assembly 300 is controlled to inject liquid nitrogen into scar tissue, wherein the single liquid nitrogen injection amount is Q, and the injection times are N.

Further, the step of controllingneedle cannula assembly 300 to inject liquid nitrogen into scar tissue may be preceded by the steps of:

theexhaust port 313 orexhaust tubing 320 of thecontrol needle assembly 300 is in communication with the negative pressure aspiration device.

It will be appreciated that the evacuation of air and nitrogen fromsyringe 310 is facilitated by controlling either vent 313 or vent 320 ofneedle cannula assembly 300 to communicate with a negative pressure aspiration device to reduce the air pressure inneedle cannula assembly 300 to facilitate the smooth injection of liquid nitrogen into the core of scar tissue. Wherein, the user can also set the time T and frequency F at which thesyringe assembly 300 communicates with the negative pressure aspiration device via the interaction module to control the time and frequency at which thesyringe assembly 300 injects liquid nitrogen. It should be noted that the preset values S, Q, N, T, F, etc. can be set according to the experience value obtained by the user.

In this embodiment, the specific operation method of the device for treating cold in scars is as follows:

(1) the user holds the cold therapy device in the scar to make thepositioning part 110 tightly attached to the epidermis of the scar tissue and make the throughhole 111 aligned to the core position of the scar tissue;

(2) setting the penetration depth of theneedle tube assembly 300, starting the in-scar freezing treatment device, and driving theneedle tube assembly 300 to penetrate into the designated position of the scar tissue through themotor 210;

(3) setting the single liquid nitrogen injection amount and the injection frequency, and starting a negative pressure device for assistance according to needs while injecting the liquid nitrogen so that the liquid nitrogen can be smoothly injected to the core of the scar tissue;

(4) the liquid nitrogen injection function of the device for the intraluminal freeze treatment of scars is stopped, andneedle cannula assembly 300 is driven bymotor 210 to withdraw from the scar tissue and move back intohousing 100.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (7)

1. An in-scar cryotherapy device, comprising:

the device comprises a shell, a first fixing piece and a second fixing piece, wherein one end of the shell is provided with a through hole;

a driving member mounted to the housing; and the number of the first and second groups,

the needle tube assembly is arranged in the shell and is connected to the driving piece, and the driving piece is used for driving the tip end of the needle tube assembly to extend out of the shell or move back into the shell through the through hole; wherein,

the needle tube assembly comprises an injection tube, the injection tube is provided with a liquid nitrogen input port and an exhaust port, the liquid nitrogen input port is used for being communicated with a liquid nitrogen source, the exhaust port is used for exhausting gas in the injection tube, and the tip of the injection tube is also provided with a liquid nitrogen injection port; or,

the needle tube assembly comprises an injection tube and an exhaust tube which are arranged side by side, the tip of the injection tube and the tip of the exhaust tube jointly form a needle point, the injection tube is provided with a liquid nitrogen input port which is used for being communicated with a liquid nitrogen source, and the tip of the injection tube is also provided with a liquid nitrogen injection port; the exhaust pipe is provided with a first vent hole which is used for being communicated with the negative pressure suction device, and the tip of the exhaust pipe is also provided with a second vent hole; or,

the needle tube assembly comprises a large needle tube and a small needle tube, the large needle tube is sleeved on the periphery of the small needle tube, a cavity is formed between the large needle tube and the small needle tube, the tip of the large needle tube and the tip of the small needle tube jointly form a needle point, one of the large needle tube and the small needle tube is an injection tube, the other one of the large needle tube and the small needle tube is an exhaust tube, the injection tube is provided with a liquid nitrogen input port communicated with a liquid nitrogen source, and the tip of the injection tube is also provided with a liquid nitrogen injection port; the exhaust pipe is provided with a first vent hole which is used for being communicated with the negative pressure suction device, and the tip of the exhaust pipe is also provided with a second vent hole;

the peripheral face of needle tubing subassembly is provided with the heat insulation layer.

2. The intralhestra cryotherapeutic device of claim 1, wherein said liquid nitrogen inlet is located at the other end of said syringe from the tip thereof, and said air vent is located in the side wall of said syringe.

3. The intrascar cryotherapy apparatus according to claim 1, wherein said large needle tube is an exhaust tube, said small needle tube is an injection tube, said liquid nitrogen input port is provided at the other end of said needle tube different from the tip thereof, and said first air vent is provided at the other end of said exhaust tube different from the tip thereof.

4. The intrascar cryotherapy device according to claim 1, wherein the housing is a cylindrical structure, and one end of the housing near the tip of the needle tube assembly is tapered, and a positioning portion is formed at the tapered end of the housing, the positioning portion is a planar structure, and the through opening is opened at the positioning portion.

5. The device of claim 4, further comprising a base plate disposed within the housing, the base plate having a first plate surface and a second plate surface opposite to the first plate surface, wherein the driving member is connected to the first plate surface, the needle assembly is connected to the second plate surface, and the driving member is configured to drive the base plate to move axially along the housing.

6. The intraluminal cryotherapeutic device of claim 5, further comprising a displacement sensor mounted to the base plate.

7. The intraluminal cryosurgical device of claim 6, wherein a connector link is further disposed at the other end of the needle cannula assembly different from the tip end thereof, and the needle cannula assembly and the base plate are detachably connected through the connector link.

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