Double-layer strip for pressure therapy

Abstract

The invention discloses a double-layer band for pressure therapy, which belongs to the technical field of elastic bands or bandages, and is characterized in that the double-layer band comprises a first bandage and a second bandage, the first bandage faces a coated target and is used for coating the target with certain pressure, the second bandage is arranged on the first bandage along the winding direction of the bandage, and the first bandage and the second bandage are arranged in parallel. The double-layer strip not only has the advantages of a long stretching bandage, but also has the advantages of a short stretching bandage, has a segmentation effect and a composite effect, can provide resting pressure for limbs to act on superficial veins in a static state, and can also be used for controlling the stretching of the first bandage to ensure that the first bandage reaches working pressure when the limbs move. The inelastic strip provides high working pressure to act on deep veins. Meanwhile, the difference of applied pressure caused by the difference of the hand feeling of different medical staff on the pulling force and the visual sense of the pressure indicating device is avoided.

Description

Technical Field

[0001] The invention relates to a double-layer strip used for pressure treatment, belonging to the technical field of elastic strips or bandages. Background Art

[0002] Traditional pressure bandages, or elastic bandages, are divided into short-stretch (elongation) bandages and long-stretch (elongation) bandages, which are mainly used to inhibit or apply pressure, or enhance venous return and muscle injury recovery, to prevent and treat venous or lymphedema. Long-stretch bandages are usually divided into four levels: 3A-3D. When the bandage is applied in a spiral rise and overlapped by 50%, it provides 20mmHg, 30mmHg, 40mmHg and 60mmHg of pressure respectively. When the pressure bandage directly contacts the limb and provides pressure, it reduces the comfort of the limb. In order to improve the comfort of the limb, some companies combine pressure bandages with cotton pad bandages, knitted fabric sleeves, foam (sponge) bandages, etc. Cotton pad bandages, knitted fabric sleeves, foam bandages, etc. of a certain thickness directly contact the skin of the limb, have good skin-friendliness, and can buffer pressure, so that the pressure on the limb is more uniform.

[0003] Combining pressure bandages with cotton pad bandages, knitted fabric sleeves, sponge bandages, etc. improves the comfort of limbs, but medical staff need to operate multiple times, which increases the complexity of bandage use. In recent years, in order to improve the ease of use of bandages, the French Urgo Laboratory and the American 3M Company have combined pressure bandages with cotton pad bandages or foam bandages to form a two-layer pressure bandage, as disclosed in patents CN101410074B and CN101193612B. Although these two new types of bandages solve some of the shortcomings of the long stretch bandages and short stretch bandages described in the patent descriptions, they are essentially long stretch bandages, and their stretch curves are as follows: Fig.10 As shown in the figure, when the pressure bandage is stretched to the working pressure T2 (Tworking), it corresponds to the pattern indicated by the pressure indicator on the bandage. However, the bandage can still be stretched to the position T1 (Tmax). Therefore, this bandage does not have the advantages of a short-stretch pressure bandage.

[0004] In addition, in order to facilitate medical personnel to control the pressure bandage to apply different pressures to the target, an indicator device is usually provided on the pressure bandage.

[0005] In the prior art, a generally adopted method is to provide an identifiable mark having a geometric shape on the pressure bandage.

[0006] The "pressure bandage with calibration device" disclosed in US5195950A can control and reduce the pressure applied to the limb by the bandage when it is wrapped. The bandage has visual marks arranged according to variable and gradually increasing distances so as to correspond to the gradually decreasing applied pressure when the bandage is wrapped.

[0007] The "elastic bandage and textile material used in such an elastic bandage" disclosed in CN 105431116A includes an elongated strip of stretchable and elastic textile material, wherein a first set of repeated markings are arranged and distributed along the longitudinal direction of the elongated strip, for associating the markings in different loops, allowing loops of unstretched elastic bandages of the same length to be wrapped and stretched around various circles with different yield rates, and wherein the elastic properties of the elongated strip enable the pressure applied by such loops of unstretched elastic bandages of the same length to be reduced.

[0008] And US Pat. No. 3,613,679A teaches a compression bandage whose central portion has markings of variable geometry evenly distributed over the entire length. The elongation of the bandage and the resulting pressure applied to the limb can be visually measured by the deformation of the geometric markings.

[0009] In the above-mentioned known technologies, when the pressure bandage is used, the mark will be covered and invisible. In addition, controlling the pressure applied to the target by simple visual marks is also a problem that needs to be solved. Summary of the invention

[0010] The present invention mainly aims at the above-mentioned problems in the prior art and extracts technical solutions that can be solved.

[0011] The technical solution adopted by the present invention is as follows:

[0012] A double-layer strip for pressure therapy, characterized in that it includes a first bandage and a second bandage, wherein the first bandage faces the target to be covered and is used to cover the target with a certain pressure, and the second bandage is arranged on the first bandage along the bandage winding direction and is used to control the stretching of the first bandage to ensure that it reaches the working pressure.

[0013] Further settings are as follows:

[0014] The first bandage is a long stretch bandage, and the second bandage is a non-elastic strip or a short stretch bandage.

[0015] When the first bandage is a long stretch bandage and the second bandage is a non-elastic strip, when the second bandage is stretched to its maximum elongation, the first bandage reaches the target pressure value; when the first bandage is a long stretch bandage and the second bandage is a short stretch bandage, when the second bandage is stretched to its maximum elongation, the double-layer strip reaches the target pressure value.

[0016] The elongated stretch bandage has an elongation rate of 20 to 200% after being stressed.

[0017] The elongated stretch bandage has an elongation rate of 60-160% after being stressed.

[0018] The elongated stretch bandage has an elongation rate of 80-120% after being stressed.

[0019] The tensile force value of the long stretch bandage when stretched to the maximum elongation is 0.67-2 N / cm.

[0020] The tensile force value of the long stretch bandage when stretched to the maximum elongation is 1.0-1.33 N / cm.

[0021] The material of the long stretch bandage is selected from one or more elastic materials such as elastic fabric, non-woven material, elastic film or elastic sponge.

[0022] The long stretch bandage can be provided with one layer, two layers or multiple layers.

[0023] The material of the second bandage is selected from one or more of woven fabric, non-woven fabric, film, braided wire and the like.

[0024] The non-elastic strip refers to a strip to which a tensile force greater than 0.5N is applied per 1cm width, and the tensile deformation thereof is less than 5% and the permanent deformation thereof is less than 2%.

[0025] The short stretch bandage is made of non-elastic material, and the elongation generated by the short stretch bandage after being subjected to tension is mainly provided by the curling of the fiber or the twist of the yarn. When a tension of 0.67N is applied to the short stretch bandage per 1cm width, the elongation rate is 20-80%.

[0026] The second bandage is provided in the form of one, two or more bandages.

[0027] The second bandages are arranged in an even number and are evenly arranged on both sides of the center line of the long stretch bandage.

[0028] The interval between two adjacent second bandages is 0 to 20 mm.

[0029] The second bandage is arranged on the first bandage in a curled shape.

[0030] When the first bandage is stretched, the second bandage transitions from a curled state to a flat state, and when the first bandage is stretched to a working elongation, the second bandage is in a completely flat state.

[0031] The first bandage and the second bandage are combined by weaving, sewing, compounding or bonding.

[0032] The lengths of the first bandage and the second bandage are set according to actual needs, and generally the total length in the stretched state is controlled within 3-7 m.

[0033] The width of the first bandage and the second bandage is set according to actual needs, and is generally controlled within a range of 6-12 cm.

[0034] The double-layer strip also includes a fixing device. When the double-layer strip reaches the target stretching length, the end of the double-layer strip is fixed to the double-layer strip body to prevent the pressure from changing.

[0035] The fixing device is selected from any one of clamping fixing and bonding fixing.

[0036] The beneficial effects of the present invention are as follows:

[0037] The double-layer band of the present invention has the advantages of both long-stretch bandages and short-stretch bandages (improving the disadvantages of short-stretch bandages), and has segmented effects and compound functions. It can provide resting pressure to the limbs to act on the superficial veins in a static state, and can also provide high working pressure to the deep veins when the limbs move. In addition, the short-stretch bandage and the inelastic conditions limit the elongation of the long-stretch bandage, and in this elongated state, it is just the state of the long-stretch bandage to provide working pressure. Therefore, when the medical staff is bandaging, they only need to stretch the bandage to the longest state, which greatly reduces the complexity of the medical staff's core pressure indication device. At the same time, there will be no different pressures applied due to the differences in the sense of tension and the visual perception of the pressure indication device by different medical staff.

[0038] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0040] Figure 2 for Figure 1 Side view of.

[0041] Figure 3 It is a schematic structural diagram of another embodiment of the present invention.

[0042] Figure 4 for Figure 3The three-dimensional state diagram.

[0043] Figure 5 It is a schematic structural diagram of another embodiment of the present invention.

[0044] Figure 6 for Figure 5 Side view of.

[0045] Figure 7 It is a schematic structural diagram of another embodiment of the present invention.

[0046] Figure 8 for Figure 7 Side view of.

[0047] Fig. 9 This is a stretch curve diagram of the existing short stretch bandage in comparative example 1.

[0048] Fig.10 This is the stretching curve diagram of the existing long stretch bandage in comparative example 2.

[0049] Fig.11 This is the fitting diagram of the stretch curve of the short stretch bandage and the long stretch bandage.

[0050] Fig.12 It is the stretching curve diagram of the double-layer strip (long stretch bandage + short stretch bandage) of Example 1.

[0051] Fig.13 This is a tensile curve diagram of the double-layer strip (non-elastic strip + long stretch bandage) of Example 2.

[0052] Fig.14 This is a diagram showing the mechanism of action of existing short stretch bandages and long stretch bandages on superficial veins and deep veins. DETAILED DESCRIPTION

[0053] In the embodiment of the present invention:

[0054] Stretching rate = (bandage stretched length - bandage static length) / bandage static length.

[0055] Tensile force value = calculated based on the pressure value declared on the bandage label (the pressure value that can be achieved at the ankle with a circumference of 23 cm when the bandage is wrapped with 50% overlap), according to the tensile force value applied per cm of the bandage unit width.

[0056] The following combination Figure 1-Figure 14 The present invention is further illustrated by the following embodiments.

[0057] like Figure 1As shown, a double-layer strip for pressure therapy includes a first bandage 1 and a second bandage 2. The first bandage 1 faces the target to be covered and is used to cover the target with a certain pressure. The second bandage 2 is arranged on the first bandage 1 along the bandage winding direction. Its main function is to control the stretching of the first bandage to ensure that it reaches the working pressure. When the second bandage 2 is stretched to the maximum elongation, the first bandage or the double-layer strip reaches the pressure value required by the target.

[0058] As a preferred embodiment:

[0059] The first bandage 1 is a long stretch bandage, and the second bandage 2 is a non-elastic strip or a short stretch bandage.

[0060] When the first bandage 1 is a long stretch bandage and the second bandage 2 is a non-elastic strip, when the second bandage 2 is stretched to the maximum elongation, the first bandage 1 reaches the target required pressure value.

[0061] When the first bandage 1 is a long stretch bandage and the second bandage 2 is a short stretch bandage, when the second bandage 2 is stretched to the maximum elongation, the double-layer strip reaches the target required pressure value (long stretch bandage + short stretch bandage).

[0062] Preferably:

[0063] The elongated bandage has an elongation rate of 20-200%, preferably 60-160%, and particularly preferably 80-120% after being stressed. The tension value of the elongated bandage when stretched to maximum elongation is 0.67-2 N / cm (unit width), preferably 1.0-1.33 N / cm.

[0064] The material of the long stretch bandage can be selected from one or a combination of elastic materials such as elastic fabric, non-woven material, elastic film or elastic sponge.

[0065] The long stretch bandage can be provided with one layer, or two or more layers. Figure 2 In the embodiment shown, the long stretch bandage is provided as one layer. Figure 3 In the embodiment shown, the long stretch bandage is provided in two layers (11, 12).

[0066] The second bandage 2 can be a non-elastic strip or a short stretch bandage.

[0067] The material of the second bandage 2 is not particularly limited, and can be a combination of one or more of woven fabrics, non-woven fabrics, films, braided wires, etc.

[0068] The non-elastic strip refers to a strip to which a tensile force greater than 0.5N is applied per 1cm width, and the tensile deformation thereof is less than 5% and the permanent deformation thereof is less than 2%.

[0069] Preferably, the non-elastic strip used in the second bandage 2 is made of polyester material and is formed by warp knitting.

[0070] The short stretch bandage is made of non-elastic material, and the elongation generated by the short stretch bandage after being subjected to tension is mainly provided by the curling of the fiber or the twist of the yarn. When a tension of 0.67N is applied to the short stretch bandage per 1cm width, the elongation rate is 20-80%.

[0071] Preferably, the short stretch bandage used in the second bandage 2 is made of pure cotton, made of 80s combed or semi-combed cotton yarn, processed by S twist and Z twist, and woven into strips. After washing, the S twist and Z twist cotton yarn shrinks and curls, and has a certain stretchability.

[0072] The second bandage 2 can be provided as one or more bands, preferably provided as a plurality of bands.

[0073] In particular, the second bandages 2 are arranged in an even number and are evenly arranged on both sides of the center line of the long stretch bandage 1. The spacing distance between two adjacent second bandages 2 is 0 to 20 mm. The distance is preferably 0 to 5 mm, and more preferably 1 to 2 mm. The advantage of this arrangement is that when the number of the second bandages 2 is set to an even number and is evenly arranged on both sides of the transverse center line of the long stretch bandage 1, it is easy for medical staff to accurately align the edge of the latter bandage with the center line position of the previous bandage when the bandage is overlapped by 50%.

[0074] exist Figure 1 In one embodiment shown, the number of the second bandages 2 is set to two, and they are evenly arranged on both sides of the center line of the first bandage 1.

[0075] exist Figure 5 In the illustrated embodiment, the number of the second bandages 2 is set to 4, and they are evenly arranged on both sides of the center line of the first bandage 1, with 2 bands on each side.

[0076] Preferably, the second bandage 2 is curled and arranged on the first bandage 1. When the first bandage 1 is stretched, the second bandage 2 will transition from a curled state to a flat state. When the first bandage 1 is stretched to the working elongation, the second bandage 2 is stretched to the maximum working elongation and is in a completely flat state. At this time, the double-layer strip reaches the target working pressure state (when the long stretch bandage + the short stretch bandage are combined, the pressure value required for the double-layer strip to reach the target; when the inelastic strip + the long stretch bandage are combined, the pressure value required for the first bandage to reach the target).

[0077] There is no particular limitation on the bonding method between the first bandage 1 and the second bandage 2 of the present invention, and the bonding can be performed by weaving, sewing, compounding, bonding, etc.

[0078] The lengths of the first bandage 1 and the second bandage 2 are set according to actual needs. Generally, the total length in the stretched state is controlled to be 3-7 m, preferably 5 m.

[0079] The width of the first bandage 1 and the second bandage 2 is set according to actual needs, generally controlled at 6-12 cm, preferably 8-10 cm.

[0080] Preferably, a double-layer strip for pressure therapy of the present invention further includes a fixing device, which fixes the end of the double-layer strip to the double-layer strip body when the double-layer strip is in use, that is, after the double-layer strip reaches the target stretching length, to prevent pressure changes.

[0081] The fixing device can be selected from any one of a clamping type fixing such as a U-shaped clip, or an adhesive type fixing such as a self-adhesive buckle.

[0082] The action mechanism of the present invention is further described in detail below in combination with different embodiments.

[0083] Embodiment 1:

[0084] This embodiment uses: long stretch bandage + short stretch bandage, wherein: the first bandage 1 is a long stretch bandage, and a tensile force of 1.33N is applied per 1cm of bandage width, and its stretching rate after force is 120%, and the second bandage 2 is a short stretch bandage. The short stretch bandage is composed of cotton yarn, and the elongation generated by the tension is mainly provided by the curling of the twisted yarn. The short stretch bandage is applied with a tensile force of 0.67N per 1cm of width, and its stretching rate is 55%.

[0085] The long stretch bandage and the short stretch bandage of this embodiment can adopt existing products that meet the above performance indicators. For example, the long stretch bandage adopts the typical 3C pressure bandage of Comparative Example 2, and the short stretch bandage adopts the all-cotton left-right twist bandage of Comparative Example 1.

[0086] When in use, the first bandage 1 faces the target to be covered, and the second bandage 2 is arranged on the first bandage 1 along the bandage winding direction. When the second bandage 2 is stretched to the maximum elongation, the double-layer strip reaches the required pressure value of 60 mmHg for the target (when the bandages are wrapped with 50% overlap, the pressure value can be reached at the ankle with a circumference of 23 cm).

[0087] The long stretch bandage + short stretch bandage of this embodiment is designed with a nominal pressure value of 60 mmHg. Of course, according to clinical needs, long stretch bandages and short stretch bandages with different performances can be combined to achieve corresponding pressure (compression) performance, as shown in Table 1 below:

[0088] Table 1: Pressure performance design of different long stretch bandages + short stretch bandages

[0089]

[0090]

[0091] Embodiment 2:

[0092] This embodiment adopts: long stretch bandage + non-elastic strip, wherein: the first bandage 1 is a long stretch bandage, a tensile force of 1.33N is applied for every 1cm of bandage width, and its stretching rate after force is 120%; the second bandage 2 adopts a non-elastic strip, and the non-elastic strip adopts polyester warp knitted fabric. A tensile force greater than 0.5N is applied for every 1cm of width, and its tensile deformation is less than 5%, and the permanent deformation is less than 2%.

[0093] The long stretch bandage of this embodiment adopts the existing typical 3C pressure bandage product that meets the above performance indicators, and the non-elastic strip adopts the polyester warp knitted plain weave that meets the above performance indicators. The two fabrics can be woven together by warp knitting.

[0094] When in use, the first bandage 1 faces the target to be wrapped, and the second bandage 2 is arranged on the first bandage 1 along the bandage winding direction. When the second bandage 2 is stretched to the maximum elongation, the double-layer strip reaches the target pressure value of 40 mmHg (when the bandages are wrapped with 50% overlap, the pressure value can be reached at the ankle with a circumference of 23 cm).

[0095] The long stretch bandage + inelastic strip in this embodiment is designed with a nominal pressure value of 40 mmHg. Of course, according to clinical needs, different long stretch bandages and inelastic strips can be combined to achieve corresponding pressure (compression) performance, as shown in Table 2 below:

[0096] Table 2: Pressure performance design of long stretch bandage + inelastic strip

[0097]

[0098] Comparative Example 1:

[0099] The present embodiment is a short stretch bandage, which is selected from a typical commercially available 130g cotton skin color left-right twisted short stretch bandage.

[0100] Elongation: The elongation of the short stretch bandage is 55% based on a tensile force of 0.67N per 1cm width.

[0101] Nominal pressure value: 20mmHg.

[0102] The performance indicators are as follows:

[0103]

[0104] Comparative Example 2:

[0105] This embodiment is a long stretch bandage selected from typical commercially available 3C pressure bandages.

[0106] Elongation: 1.33N of tension is applied per 1cm of bandage width, and the elongation is 120%. Nominal pressure value: 40mmHg.

[0107] Its performance indicators are as follows:

[0108]

[0109]

[0110] Performance Testing

[0111] The "long stretch bandage + short stretch bandage" and "long stretch bandage + inelastic strip" of Examples 1-2 of the present invention, the short stretch bandage of Comparative Example 1, and the long stretch bandage of Comparative Example 2 were tested for tensile properties.

[0112] Test subjects:

[0113] Comparative Example 1: 130g cotton skin-colored left-right twist short stretch bandage, nominal pressure value 20mmHg.

[0114] Comparative Example 2: Typical 3C pressure bandage, nominal pressure value 40 mmHg.

[0115] Embodiment 1: long stretch bandage + short stretch bandage: nominal pressure value 60 mmHg.

[0116] Example 2: Long stretch bandage + non-elastic strip: nominal pressure value 40 mmHg.

[0117] Test method:

[0118] The bandage or double-layer strip to be tested is stretched twice continuously by a constant-speed tensile tester. The bandage is conditioned (under standard atmospheric test conditions of 20±2℃, 65±5% RH) for 24 hours before the tensile test. A 300mm sample is taken along the length of the bandage. The clamp distance of the constant-speed tensile tester is 200mm, and the stretching speed is 200mm / min. The test tension T is calculated based on the nominal width of the bandage or strip instead of the actual width. 1 and T 2 .

[0119] In the tensile curve experiment: T1 = Tmax * nominal width of the bandage; T2 = Tw * nominal width of the bandage.

[0120] Nominal pressure value Maximum tensile force per unit width (Tmax) N / cm Working tension per unit width (Tw) N / cm 20 mmHg 0.67 0.50 30 mmHg 1.00 0.75 40 mmHg 1.33 1.00 60 mmHg 2.00 1.50

[0121] In the table: the tension applied when stretched to the maximum elongation is calculated based on the unit width Tmax, and the tension applied when stretched to the working elongation is calculated based on the unit width Tw.

[0122] Test results:

[0123] Fig. 9 This is the tensile curve of the short-stretch bandage. According to the nominal width of the bandage (10 cm), the test tensile force T is calculated based on the maximum tensile force per unit width of 0.67 N / cm. 1 ; Calculate the test tension value T based on the working tension of unit width 0.5N / cm 2 .

[0124] Fig.10 This is the tensile curve of the long stretch bandage. According to the nominal width of the bandage (10cm), the test tensile force T is calculated based on the maximum tensile force per unit width of 1.33N / cm. 1 ; Calculate the test tension value T according to the working tension of unit width 1.00 / cm 2 .

[0125] Fig.11 This is the fitting diagram of the stretch curve of the short stretch bandage and the long stretch bandage.

[0126] Fig.12 The tensile curve of the double-layer bandage (long stretch bandage + short stretch bandage) of Example 1 is shown in Figure 1. The test tensile force T is calculated based on the nominal width of the bandage (10 cm) and the maximum tensile force per unit width of 2.00 N / cm. 1 ; Calculate the test tension value T based on the working tension of 1.50 / cm per unit width 2 .

[0127] Fig.13 The tensile curve of the double-layer strip (non-elastic strip + long stretch bandage) of Example 2 is shown in Figure 2. The test tensile force T is calculated based on the nominal width of the bandage and the unit width of 1.33 N / cm. 1 ; Calculate the test tension value T based on the working tension of unit width 1.00 / cm 2 .

[0128] analyze:

[0129] First, see Fig.11 It can be seen that: Fig.11The figure shows the overlap of the respective stretch curves of the short stretch bandage and the long stretch bandage. It can be seen that the elongation of the short stretch bandage will limit the long stretch bandage from being stretched to the working state. Therefore, when the long stretch bandage has not reached the working tension range, the length of the short stretch bandage needs to be increased so that the short stretch bandage will not limit the elongation and working tension of the long stretch bandage. Specifically: the total length of the short stretch bandage stretched to the working state is set to be consistent with the length of the long stretch bandage stretched to the working state, and after the increased length of the short stretch bandage is restored, a tension is formed on the long stretch bandage. Figure 3 Curl from side view.

[0130] Fig.12 The tensile curve of the double-layer strip (long stretch bandage + short stretch bandage) of Example 1 is shown. In the figure: 3A is the tensile curve of the short stretch bandage stretched from a curled state to a flat state, 3C is the tensile curve of the long stretch bandage stretched alone, and the dotted line represents the curve when the short stretch bandage / long stretch bandage is stretched alone and the evolution of the fitting. 3A+3C is the tensile curve of the double-layer strip. Fig.12 It can be seen that: when the long stretch bandage is stretched, the increased length of the short stretch bandage will transition from a curled state to a flat state (the red curve parallel to the X-axis). When the long stretch bandage is stretched to the working elongation, the short stretch bandage is stretched to the working elongation and is in a completely flat state. At this time, the double-layer strip reaches the target working pressure state (the working tension of the short stretch bandage is superimposed on the working tension of the long stretch bandage, and the stretching curve of the short stretch bandage rises from the red dotted line to a combined curve with the long stretch bandage).

[0131] Fig.13 The stretching curve of the double-layer strip (non-elastic strip + long stretch bandage) of Example 2 is shown. In the figure: the dotted line represents the curve when the non-elastic strip / long stretch bandage is stretched alone and the evolution when it is fitted. Fig.13 It can be seen that when the long stretch bandage is stretched, the curled part of the non-elastic strip will transition from a curled state to a flat state (the red curve parallel to the X-axis). When the long stretch bandage is stretched to the working elongation, the non-elastic bandage is stretched to the maximum length and is in a completely flat state. At this time, the double-layer strip reaches the target working pressure state.

[0132] Compared with the prior art, the present invention has the following beneficial effects:

[0133] Fig.14The action mechanism of existing short-stretch bandages and long-stretch bandages on superficial veins and deep veins is shown. After the short-stretch bandage is bandaged on the limb, it has almost no or very little stretching ability. When the limb moves, the contraction of the muscles causes the local outer diameter of the limb to increase, but the short-stretch bandage hardly stretches. The reverse force it provides causes the femoral muscles at the part with increased outer diameter to compress the deep vein inward, so that the short-stretch bandage has a better effect on the deep vein than the long-stretch bandage. On the contrary, after the long-stretch bandage is bandaged on the limb, it still has a good stretching ability. When the limb moves, the contraction of the muscles causes the local outer diameter of the limb to increase, and the bandage stretches accordingly. The reverse force it provides only acts on the superficial veins. The long-stretch bandage has a better effect on the superficial veins than the short-stretch bandage.

[0134] The present invention innovatively combines a short stretch bandage / non-elastic strip with a long stretch bandage, which makes up for the defects of the existing short stretch bandage and long stretch bandage. When the short stretch bandage and the long stretch bandage are combined together in a static state with equal length, Fig.11 As shown, short stretch bandages limit the application of long stretch bandages under working pressure conditions. Fig.12 As shown, the total length of the short-stretch bandage in the stretched state is consistent with the stretched length of the long-stretch bandage under the working pressure state. In this combination, the pressure of the short-stretch bandage and the long-stretch bandage under the working pressure state will be accumulated. After the limb is wrapped with this new double-layer bandage of short-stretch bandage / non-elastic strip + long-stretch bandage, the long-stretch bandage and the short-stretch bandage jointly provide resting pressure in the static state, acting on the superficial veins. When the limb moves, the short-stretch bandage provides high working pressure, acting on the deep veins.

[0135] Fig.13 Another embodiment is shown, which uses a double-layer strip structure of a non-elastic strip + a long stretch bandage. This embodiment can avoid the pressure accumulation of the short stretch bandage and the long stretch bandage under the working pressure state, and combines the non-elastic strip with the long stretch bandage, that is, the total length of the non-elastic strip is consistent with the bandage stretching length of the long stretch bandage under the working pressure state. In this combination, in a static state, the long stretch bandage provides resting pressure to act on the superficial veins. When the limbs move, the non-elastic strip provides high working pressure to act on the deep veins.

Claims

1. A double-layer strip for pressure therapy, characterized in that: It includes a first bandage and a second bandage. The first bandage faces the target to be covered and is used to cover the target with a certain pressure. The second bandage is arranged on the first bandage along the winding direction of the bandage and is used to control the stretching of the first bandage to ensure that it reaches the working pressure.

2. A double-layer strip for pressure therapy according to claim 1, characterized in that: The first bandage is a long stretch bandage, and the second bandage is a non-elastic strip or a short stretch bandage.

3. A double-layer strip for pressure therapy according to claim 2, characterized in that: When the first bandage is a long stretch bandage and the second bandage is a non-elastic strip, when the second bandage is stretched to its maximum elongation, the first bandage reaches the target pressure value; when the first bandage is a long stretch bandage and the second bandage is a short stretch bandage, when the second bandage is stretched to its maximum elongation, the double-layer strip reaches the target pressure value.

4. A double-layer strip for pressure therapy according to claim 2, characterized in that: The elongated stretch bandage has an elongation rate of 20 to 200% after being stressed.

5. A double-layer strip for pressure therapy according to claim 4, characterized in that: The elongated stretch bandage has an elongation rate of 60-160% after being stressed.

6. A double-layer strip for pressure therapy according to claim 5, characterized in that: The elongated stretch bandage has an elongation rate of 80-120% after being stressed.

7. A double-layer strip for pressure therapy according to claim 2, characterized in that: The tensile force value of the long stretch bandage when stretched to the maximum elongation is 0.67-2 N / cm.

8. A double-layer strip for pressure therapy according to claim 7, characterized in that: The tensile force value of the long stretch bandage when stretched to the maximum elongation is 1.0-1.33 N / cm.

9. A double-layer strip for pressure therapy according to claim 2, characterized in that: The material of the long stretch bandage is selected from one or more elastic materials such as elastic fabric, non-woven material, elastic film or elastic sponge.

10. A double-layer strip for pressure therapy according to claim 2, characterized in that: The long stretch bandage can be provided with one layer, two layers or multiple layers.

11. A double-layer strip for pressure therapy according to claim 2, characterized in that: The material of the second bandage is selected from one or more of woven fabric, non-woven fabric, film, braided wire and the like.

12. A double-layer strip for pressure therapy according to claim 2, characterized in that: The non-elastic strip refers to a strip to which a tensile force greater than 0.5N is applied per 1cm width, and the tensile deformation thereof is less than 5% and the permanent deformation thereof is less than 2%.

13. A double-layer strip for pressure therapy according to claim 2, characterized in that: The short stretch bandage is made of non-elastic material, and the elongation generated by the short stretch bandage after being subjected to tension is mainly provided by the curling of the fiber or the twist of the yarn. When a tension of 0.67N is applied to the short stretch bandage per 1cm width, the elongation rate is 20-80%.

14. A double-layered strip for pressure therapy according to claim 2, characterized in that: The second bandage is provided in the form of one, two or more bandages.

15. A double-layered strip for pressure therapy according to claim 14, characterized in that: The second bandages are arranged in an even number and are evenly arranged on both sides of the center line of the long stretch bandage.

16. A double-layered strip for pressure therapy according to claim 14, characterized in that: The interval between two adjacent second bandages is 0 to 20 mm.

17. A double-layered strip for pressure therapy according to claim 1, characterized in that: The second bandage is arranged on the first bandage in a curled shape.

18. A double-layered strip for pressure therapy according to claim 17, characterized in that: When the first bandage is stretched, the second bandage transitions from a curled state to a flat state, and when the first bandage is stretched to a working elongation, the second bandage is in a completely flat state.

19. A double-layered strip for pressure therapy according to claim 1, characterized in that: The first bandage and the second bandage are combined by weaving, sewing, compounding or bonding.

Images