Skin retractor for arc-shaped limb part

Abstract

The invention provides a skin retractor for an arc-shaped limb part, and relates to the technical field of medical instruments. The device mainly comprises a bent threaded rod, nuts assembled at the two ends of the bent threaded rod, a fixing hook slidably arranged on the rod in a sleeving mode, and a propelling mechanism composed of a first sleeve, a spring and a second sleeve. The fixing hook is designed in a split mode, an adjusting plate and a base are connected through bolts and nuts, and the height can be flexibly adjusted. A through hole is formed in the bottom of the base and used for allowing a kirschner wire to penetrate and be fixed. The propelling mechanism is driven by screwing the nut to move along the bent threaded rod, traction force is transmitted and quantified through the spring, and finally progressive traction on wound edge skin is achieved through the fixing hook. The device can perfectly fit an arc-shaped limb part, effectively solves the problems of poor fit, overlarge end point gap, inconvenience in height adjustment and the like of the existing straight rod retractor, and has the advantages of controllable traction force, high adaptability and simplicity and convenience in operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a skin traction device for arc-shaped limb parts. BACKGROUND

[0002] The skin traction device is a medical device that uses mechanical force to gradually pull the normal skin around the wound edge to promote its stretching and proliferation to close the defect. It has important value in the field of wound repair, especially for complex wounds that are difficult to handle by traditional skin grafting or skin flap surgery. However, the existing skin traction device has the problem of insufficient applicability. The existing straight rod skin traction device is used for flat skin, and the effect is not good for curved skin, and there may be a problem of traction. And the existing skin traction device has the problem of too large gap at the working endpoint, which requires secondary surgery. And the existing straight rod skin traction device has the problem of poor fit when applied to skin with curved contour (such as arc-shaped limb parts), and a large gap is easily generated at the working endpoint, which often requires secondary surgery. At the same time, its height adjustment ability is limited or cannot be adjusted, which is difficult to meet the clinical needs. SUMMARY

[0003] Therefore, the present application provides an improved skin traction device to solve the above problems, which uses a curved threaded rod to adapt to curved skin and ensure effective fit and traction. The fixed hook part is designed in a split type, divided into two parts of adjusting plate and base, and the height is adjusted up and down by bolt and nut connection. By screwing the nut to move along the curved threaded rod, the two sleeves are pushed to move; a spring is arranged between the two sleeves, and a force scale mark is arranged on the smaller sleeve, so that the required tension on the skin can be accurately controlled and quantitatively displayed. The present application is especially suitable for skin traction of arc-shaped limb parts, and can effectively solve the problems of too large gap at the working endpoint and inconvenient height adjustment.

[0004] The skin traction device for arc-shaped limb parts provided by the present application mainly comprises a curved threaded rod, a thrust nut, a fixed hook, and a pushing mechanism, and from left to right, there are a nut, a fixed hook, a sleeve one, a spring, a sleeve two, and another nut.

[0005] Further, the fixed hook mainly comprises an adjusting plate, a base, a locking screw, a fixed nut, and a fixed bolt, the lower part of the adjusting plate has two through holes for fixing with the base and adjusting the height, and the bottom of the base has a through hole to allow the Kirschner wire to be inserted and fixed by the locking screw.

[0006] Further, the pushing mechanism comprises sleeve one, spring, sleeve two and nut. The nut can be displaced radially along the curved threaded rod, thereby pushing the sleeve two to move synchronously. The sleeve two is internally formed with an axial cavity, one end of which is provided with a stepped reduced diameter structure, and the spring is embedded in the reduced diameter structure and abuts against the same, so that the movement of the sleeve two can push the spring. The spring further pushes the sleeve one to move.

[0007] Further, a scale mark for quantifying the stretching force is arranged on the outer wall of the sleeve one, so that the pulling force applied to the skin can be accurately controlled by the pushing mechanism, and the fixed hook is finally driven to move.

[0008] Compared with the prior art, the present application has the following advantages:

[0009] 1. The skin stretcher for arc-shaped limb parts provided by the present application adopts a curved threaded rod to adapt to the curved skin, thereby ensuring effective fitting and pulling.

[0010] 2. The skin stretcher for arc-shaped limb parts provided by the present application adopts a split design for the fixed hook part, which is divided into two parts of adjusting plate and base, and the height can be adjusted up and down by screwing the bolt and nut.

[0011] 3. The skin stretcher for arc-shaped limb parts provided by the present application can move the nut along the curved threaded rod by screwing, thereby pushing the two sleeves to move relatively; the spring is arranged between the two sleeves, and a force scale mark is arranged on the smaller sleeve, so that the required stretching force applied to the skin can be accurately controlled and quantitatively displayed. The present application is especially suitable for skin stretching of arc-shaped limb parts, and can effectively solve the problems of excessive gap at the working terminal point and inconvenient height adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0013] Fig. 1 It is a schematic diagram of the overall structure of the present application;

[0014] Fig. 2 It is a sectional view and left view of the adjusting plate;

[0015] Fig. 3 It is a three-view drawing of the base;

[0016] Figs. 4-5 It is a sectional view of two working states of the fixed hook;

[0017] Fig. 6 is a cross-sectional view and a left view of sleeve one;

[0018] Fig. 7 is a cross-sectional view and a left view of sleeve two.

[0019] BRIEF DESCRIPTION OF DRAWINGS

[0020] 1, nut; 2, curved threaded rod; 3, fixed hook; 31, adjusting plate; 32, base; 4, sleeve one; 5, spring; 6, sleeve two; 7, set screw; 8, fixed nut; 9, fixed bolt. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Example 1

[0023] Reference Figs. 1-7 The present application provides a skin traction device for arc-shaped limb parts. The present application mainly comprises a curved threaded rod 2, a nut 1, a fixed hook 3 and a pushing mechanism. The fixed hook 3 is composed of an adjusting plate 31 and a base 32, and the height is adjusted by a bolt nut. The bottom of the base 32 is provided with a through hole for passing a Kirschner wire and being fixed by a set screw 7.

[0024] The pushing mechanism comprises a sleeve one 4, a spring 5 and a sleeve two 6. Rotating the nut 1 pushes the sleeve two 6 to move, compresses the spring 5, and then pushes the sleeve one 4 to move, thereby realizing gradual traction of the skin. The outer wall of the sleeve one 4 is provided with a scale for quantifying the traction force.

[0025] Before the operation, the skin traction device is assembled in advance. The nut 1, the fixed hook 3, the sleeve one 4, the spring 5 and the sleeve two 6 are installed on the curved threaded rod 2 in a predetermined order. The adjusting plate 31 in the fixed hook 3 is adjusted to the required height and fixed. The operator manually slides the adjusting plate 31 up and down according to the specific contour of the arc-shaped limb part of the patient and the operation needs, so as to change the vertical distance between the bottom of the fixed hook 3 and the bottom of the base 32. Until the most suitable and effective height position is found, the through hole on the adjusting plate 31 corresponds to the through hole on the base 32, and then the bolt nut is inserted for fixation.

[0026] During operation, a Kirschner wire is inserted through the through hole at the bottom of the base 32 of the fixed hook 3, and the Kirschner wire is locked by the set screw 7. After the fixation is completed, the nut 1 on the side away from the sleeve 2 is locked. Then, the nut 1 adjacent to the sleeve 2 is rotated to drive the advancing mechanism to operate until the required traction force is achieved during the operation. During the traction process, the nut 1 is tightened regularly to maintain and increase the traction force until the skin is pulled to the desired position.

[0027] Rotating the nut 1 pushes the sleeve 2 to compress the spring 5, the spring 5 pushes the sleeve 1 to push the fixed hook 3, the fixed hook 3 pulls the Kirschner wire, and the Kirschner wire pulls the skin.

[0028] At the beginning of the operation, the doctor will insert two Kirschner wires through the healthy skin tissue on both sides of the skin wound that needs to be pulled. Then the two ends of the Kirschner wires are fixed on the base 32 of the fixed hook 3 of the two skin traction devices. This means that in actual use, two traction devices are symmetrically installed on both sides of the limb, one responsible for pulling to the left and the other responsible for pulling to the right. At this time, the spring 5 is in a slightly compressed or natural state, and the entire system is stable.

[0029] The doctor rotates the nut 1 near the sleeve 2 on one of the traction devices. Since the nut 1 cannot move axially, according to the principle of threaded transmission, rotating the nut will force it to move along the axis of the curved threaded rod 2. Please note that although the rod is curved, the nut moves along the "curved axis" of the rod, not in a straight line. The movement of the nut 1 directly pushes the sleeve 2 in contact with it to move. The sleeve 2 moves inward (toward the other fixed hook) and compresses the spring 5 inside it. The spring 5 is compressed, generating a constantly increasing counteracting spring force. The spring 5 here plays the dual role of "force buffer" and "constant force source", which is the essence of "progressive traction". Buffering effect (protecting the tissue): skin, subcutaneous tissue and muscle are biological tissues with viscoelasticity and cannot withstand instantaneous violent traction. If you directly use a rigid mechanism to pull hard, it will cause the tissue to tear, ischemic necrosis. The compression of the spring is a relatively gentle process, which converts the "rigidity" action of the doctor rotating the nut into a "flexible" traction force on the tissue, avoiding sudden impact.

[0030] Constant force (continuous stimulation): During the traction process, the skin tissue being pulled will have a slight tendency to retract due to stress relaxation. Without the spring 5, the traction force will quickly decrease. But with the spring 5, when the tissue has a slight retraction, the spring 5 will slightly stretch and release the stored elastic force, automatically and continuously maintaining a substantially constant traction force on the tissue, ensuring that the traction effect is not interrupted. This is the meaning of "progressive" - the force is continuously and steadily applied. The other end of the compressed spring 5 is against the sleeve 4. The elastic force generated by the spring 5 is transmitted to the fixed hook 3 through the sleeve 4. The fixed hook 3, through the Kirschner wire, finally applies this continuous, progressive traction force to the skin tissue. The scale on the sleeve 4, in theory, corresponds to the compression amount of the spring 5, thereby indirectly indicating the size of the traction force.

[0031] The doctor does not do it in one step, but through regular, fractional tightening of the nut (for example, several times a day), each time only increasing the compression amount by a small amount, so that the traction force is slowly and in stages. The presence of the spring 5 makes the traction force not disappear during the interval between two manual adjustments, but continuously and gently act on the tissue, guiding the tissue cells to slowly proliferate and stretch under the continuous mechanical stimulation.

[0032] Therefore, pushing the sleeve 4 to move is essentially the last step of releasing the elastic force accumulated by the spring 5 to the skin. The core driving source of the entire system is the spring 5 compressed by the nut, and the sleeve 4 is the final transmission component of this force. Without the buffering and constant force characteristics of the spring 5, this device degenerates into a simple "tensioner" and cannot achieve safe and effective clinical "progressive traction" effect.

[0033] Obviously, the above embodiments are only examples for the sake of clarity, and are not limiting of the embodiments. Based on the above description, those of ordinary skill in the art can make other different forms of changes or variations. Here, it is not necessary and impossible to exhaust all embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A skin traction device for curved limbs, characterized in that, Including bent threaded rod (2); Two nuts (1) are located at both ends of the bent threaded rod (2); At least one fixed hook (3) is fitted onto the bent threaded rod (2); The propulsion mechanism is mounted on the bent threaded rod (2); The propulsion mechanism is used to push the fixed hook (3) to move along the curved threaded rod (2).

2. The skin traction device for curved limbs according to claim 1, characterized in that, The propulsion mechanism includes a first sleeve (4), a second sleeve (6), and a spring (5) disposed between the two, all of which are slidably sleeved on the surface of the curved threaded rod (2).

3. The skin traction device for curved limbs according to claim 2, characterized in that, The fixing hook (3) includes an adjusting plate (31) and a base (32). The adjusting plate (31) is inserted into the cavity opened in the base (32) and is connected to the base (32) by a bolt and nut structure.

4. The skin traction device for curved limbs according to claim 3, characterized in that, The base (32) has a through hole at the bottom for inserting Kirschner wires and is fixed by a set screw (7).

5. The skin traction device for curved limbs according to claim 4, characterized in that, The sleeve (6) has an axial chamber inside, and one end of it has a stepped diameter reduction structure. The spring (5) is embedded in the diameter reduction structure.

6. The skin traction device for curved limbs according to claim 5, characterized in that, The outer wall of the sleeve (4) is provided with scale markings for quantifying traction force.

7. The skin traction device for curved limbs according to claim 6, characterized in that, The adjustment plate (31) has two through holes at the bottom, which are connected to the base (32) by fixing bolts (9) and fixing nuts (8).

8. The skin traction device for curved limbs according to claim 7, characterized in that, The spring (5) is a compression spring, and its two ends abut against sleeve one (4) and sleeve two (6) respectively.

9. The skin traction device for curved limbs according to claim 8, characterized in that, The nut (1) is a wing nut or a nut with a handle.

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