CN103565608B - Finger continuous passive motion - Google Patents

Abstract

The invention discloses a finger continuous passive motion comprising a shell body. A first traction device and a power device are arranged in the shell body. The power device is connected with the first traction device. The first traction device is connected with a finger. A second traction device is arranged outside the shell body. The second traction device is connected with the finger. The finger continuous passive motion is simple, light, low in cost, easy to manufacture, and particularly suitable for being used when a patient has a rest (especially at night).

Description

Finger continuous passive motion instrument

Technical field

The present invention relates to limb rehabilitating device, particularly relate to a kind of finger continuous passive motion instrument.

Background technology

As everyone knows, the proper motion of hands has important function in the work of mankind's daily life.Hands has complicated anatomical structure and meticulous motor function, and comprising 21 degree of freedom (DOF, degree offreedom), every only finger 4 DOF, thumb has 5 DOF.For each finger, metacarpophalangeal joints (MP) has 2 DOF, and proximal interphalangeal joint (PIP) and DIPJ (DIP) only have 1 DOF (thumb metacarpophalangeal joints has 3 DOF).But hands is an organ very easily damaged, and hand injury account for higher ratio in all wounds, emergency operation or the orthopaedics case of about 40% are all hand injury, comprise finger tendon, ligament injury.In addition, the patient of apoplexy also has finger function obstacle, and same needs treats for a long time.Hands has meticulous anatomical structure, and only has few muscle attachment, and therefore the rehabilitation of hand injury is quite difficult.As a rule, hand injuryies rehabilitation is consuming time longer, and functional rehabilitation is unsatisfactory.The treatment of articular trauma needs the fixing of long period mostly, often hinders the recovery of function of joint because of the impact of the factors such as amyotrophy, arthrogryposis and intra-articular adhesion, causes ankylosis.The rehabilitation of hands function mainly comprises three kinds of Therapeutic Method: be first naturopathy, as thermotherapy, ultrasonic therapy, electrotherapy etc.; Next carries out initiatively or passive exercise therapy; It is finally the activity maintaining function of nervous system and normal muscle tendon.Wherein outbalance and what need adhere to for a long time is initiatively or passive motion.

In recent years, the rehabilitation course developing into numerous nerve or skeletal musculature injured patient of healing robot brings huge progress, wherein just comprising with passive exercise is the continuous passive motion instrument (CPM, continuous passive motion) of ultimate principle.But, initial CPM mainly for the large joint of human body, such as hip joint, knee joint, elbow joint etc.Nowadays, the existing finger continuous passive motion instrument being specifically designed to the such Minor articulus of interphalangeal joint, and there is meticulousr control ability, comprise control and the movement dimension of the movement angle to interphalangeal joint, moment, angular velocity etc., it is applied to hand injury rehabilitation can alleviate hand edema, reduce adhesion, promote injury recovery, maintain range of motion.

Meticulous small and exquisite due to finger tendon ligament, less adhesion all can cause hand function to decline, patient particularly after finger tendon reconstruction, after patient falls asleep night, finger maintains a certain angle for a long time, can cause the adhesion pointing tiny ligament tendon, next day, the mobility of whole finger can regress again.But existing finger passive exercise instrument design is complicated, volume is comparatively large, wears and treats, power supply, cost in addition, the factors such as medical expense during inconvenient patient's rest in evening, and patient also cannot be made to continue to use.

Summary of the invention

For the shortcoming of prior art, the object of this invention is to provide a kind of finger continuous passive motion instrument, facilitate patient to continue to use and can at night rest time wear use.

To achieve these goals, technical scheme of the present invention is: a kind of finger continuous passive motion instrument, comprise housing, first pulling device and power set are set in described housing, power set are connected with the first pulling device, first pulling device is connected with finger, second pulling device is set outside housing, this second pulling device is connected with finger, described first pulling device comprises rotating disk and cotton thread, rotating disk arranges joint pin, and the rear end of cotton thread is connected with joint pin, and the front end of cotton thread is connected with the finger tip of finger through after the through hole that described housing is offered.

Preferably, described housing is a dismountable plastic box body.

Preferably, described power set comprise motor and power supply, and motor and power supply are electrically connected.

Preferably, described power supply is battery.

Preferably, described power set also comprise a potentiometer be connected with described motor, power supply respectively.

Preferably, described rotating disk is disposed radially the adjustment hole that the described joint pin of a plurality of confession inserts.

Preferably, described second pulling device comprises rubber band and elongated rod, and the front end of rubber band is connected with the finger tip of finger, and the rear end of rubber band is connected with the front end of elongated rod, and the rear end of elongated rod is fixed on the back of the hand simultaneously.

Preferably, sheathed connector for connection on the finger tip of finger.

Preferably, in the described housing forearm that is fixed on upper limb or wrist.

Compared with prior art, beneficial effect of the present invention is: (1) volume is little, device major part is fixed in box, patient forearm can be fixed on by forearm orthosis, elegant in appearance, conveniently wear, small and exquisite due to volume, patient can really wear for a long time, and also wears when rest always, realizes real continuous passive motion treatment; (2) building block is simple, does not need external power supply, as long as battery powered, facilitates the use of patient, and when being also more suitable for having a rest for night; (3) have controllability, comprise joint motion angular velocity, activity point of view, frequency speed, movable amplitude requires that PIP is from 0 ° to 50 °-90 ° at the beginning, and DIP is from 0 ° to 20 °, and metacarpophalangeal joints moves from the scope of 60 ° to 90 °.Controllability is provide possibility for the patient of the different order of severity and the selective therapy of patient's different times; (4) failure rate is low of electric aspect, the parts such as cord, rubber band can not constitute a threat to patient's finger, and some is by the CPM of electronic circuit control, then likely because some reason cause motor out of hand to finger tendon muscle etc. cause irremediable loss.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Fig. 1 is structural representation of the present invention.

Fig. 2 is the second pulling device schematic diagram of the present invention.

Fig. 3 is the first pulling device kinestate analysis chart of the present invention.

Fig. 4 is finger motion of the present invention vertical coordinate-time plot.

Fig. 5 is finger motion speed-time curve figure of the present invention.

Fig. 6 is the rotating disk schematic diagram of the first pulling device.

Fig. 7 is schematic diagram when finger stretches under duty of the present invention.

Schematic diagram when Fig. 8 is digital flexion under duty of the present invention.

Detailed description of the invention

Refer to Fig. 1 and Fig. 2, the finger continuous passive motion instrument of the present embodiment comprises housing 1, this housing is a dismountable plastic box body, first pulling device and power set are set in the housing, power set comprise motor 2, power supply 3 and potentiometer 4, this motor 2 is micromachine, power supply is battery, motor and battery are electrically connected, potentiometer is electrically connected with motor and battery respectively, first pulling device comprises rotating disk 5 and cotton thread 6, the rotating shaft of rotating disk 5 is connected with the output shaft of motor 2, rotating disk 5 arranges joint pin 7, the rear end of cotton thread 6 is connected with joint pin 7, front end is connected with the finger tip of finger 9 through after the through hole 8 that housing 1 is offered, second pulling device is set outside housing 1, this second pulling device comprises rubber band 10 and elongated rod 11, the front end of rubber band 10 is connected with the finger tip of finger 9, rear end is connected with the front end of elongated rod 11, the rear end of elongated rod is fixed on the back of the hand or refers on root simultaneously, the sheathed connector 12 (as false nail sheet) be connected with rubber band for cotton thread on the finger tip of finger.According to the concrete condition of patient, the front end of rubber band and cotton thread also can be connected with other positions of finger.

Refer to Fig. 3, during battery powered, motor drives the dial rotation on it, and because finger has the constraint of rubber band, therefore in motor process, cotton thread will keep tight state always, namely have pulling force to exist always.Wherein, the round A on rotating disk is the joint pin on rotating disk, and its distance to center of turntable is r, and disc radius is R, and lines ABC is cotton thread, and total length is L.Cotton thread ABC is through the ring in the middle of agent set, and C end is bundled on finger.Because bound finger is also bound rubber band, therefore when rotating disk is along with engine rotation, C end moves reciprocatingly immediately.The horizontal range at center of turntable and B place (namely and annulus) is h.If engine speed is n, then the angular velocity w=2pn of rotating disk running.If the angle of OA and x-axis is θ, then

$\mathrm{AB}=\sqrt{{\mathrm{OA}}^2+{\mathrm{OB}}^2-2\mathrm{OAgOBg}\cos (\mathrm{wt}+\frac{2}{p})}=\sqrt{r^2+h^2+2\mathrm{rh}\sin \left(\mathrm{wt}\right)}---\left(1\right)$

BC＝L-AB (2)

C point abscissa is 0, and vertical coordinate is

$-h-\mathrm{BC}=\mathrm{AB}-h-L=\sqrt{r^2+h^2+2\mathrm{rh}\sin \left(\mathrm{wt}\right)}-h-L---\left(3\right)$

Namely C point coordinates is

C point vertical coordinate, to t differentiate, is the speed that C point runs.Its speed is

$v=\frac{\mathrm{hrw}\cos \left(\mathrm{wt}\right)}{\sqrt{h^2+2\mathrm{hr}\sin \left(\mathrm{wt}\right)+r^2}}---\left(4\right)$

The stroke of finger motion is

L＝2r (5)

As shown in Figure 3, the stroke during finger motion displacement of one way (when the moving back and forth) is determined by the distance of joint pin apart from disc centre, is 2r.In the continuous passive motion process of finger, in fact its track is a camber line, but also can be approximately straight line section.Getting finger continuous passive motion one way is 6cm, then r=3cm.Separately get disk operating angle speed w=π rad/s, the cycle is T=2s, h=12cm, R=4cm, L=20cm.

Refer to Fig. 4 and Fig. 5, the rate curve of C point is close with sine curve, and maximum operational speed is about 9cm/s, but only maintains very short time, and all in all speed is comparatively mild, can not cause larger impact to finger-joint and tendon ligament etc. thereof.In addition, suffered pulling force not very big when considering finger passive exercise, general miniature motor at a slow speed can meet the demands, and this also reduces cost to a certain extent.

From formula (4), the speed of finger motion is by changing the resistance of potentiometer and then changing the rotating speed of motor or change joint pin and regulate with the distance of center of turntable, and the stroke of finger motion is undertaken by the distance of the joint pin on adjustment rotating disk and center of turntable.Refer to Fig. 6, rotating disk can be designed to following shape, and joint pin lower end can be designed to helical form, matches with the hole 13 on rotating disk.When being inserted in the hole on rotating disk, the distance r that can arrange 7 × 4=28 group different regulates.

Refer to Fig. 7 and Fig. 8, job step of the present invention is as follows:

(1) false nail sheet on orthopedic finger plaster (or other can be worn on finger, has aperture can fix the parts of cord and rubber band) need be carried out, and elongated rod is fixed on the hands back of the body;

(2) according to the practical situation of patient, wear forearm orthosis and the housing being packaged with power set and the first pulling device is fixed on arm, and choose rubber band and the cotton thread of appropriate length, cotton thread and housing are positioned at the finger belly side of finger, and rubber band and elongated rod are positioned at the finger back of the body side of finger.

(3) turn on the power switch, and adjust motor speed and joint pin to the distance of center of turntable, make finger carry out passive exercise with suitable speed.

Although the present invention discloses as above with preferred embodiment, and is not used to limit scope of the invention process.The ordinary person of any this area, not departing from the scope of utility model, does some improvement, and namely every equal improvement done according to the present invention, should be scope of the present invention and contained.

Claims (9)

1. a finger continuous passive motion instrument, comprise housing, it is characterized in that, first pulling device and power set are set in described housing, power set are connected with the first pulling device, first pulling device is connected with finger, second pulling device is set outside housing, this second pulling device is connected with finger, described first pulling device comprises rotating disk and cotton thread, rotating disk arranges joint pin, and the rear end of cotton thread is connected with joint pin, and the front end of cotton thread is connected with the finger tip of finger through after the through hole that described housing is offered.

2. finger continuous passive motion instrument according to claim 1, is characterized in that, described housing is a dismountable plastic box body.

3. finger continuous passive motion instrument according to claim 1, it is characterized in that, described power set comprise motor and power supply, and motor and power supply are electrically connected.

4. finger continuous passive motion instrument according to claim 3, is characterized in that, described power supply is battery.

5. finger continuous passive motion instrument according to claim 3, is characterized in that, described power set also comprise a potentiometer be connected with described motor, power supply respectively.

6. finger continuous passive motion instrument according to claim 1, is characterized in that, described rotating disk is disposed radially the adjustment hole that the described joint pin of a plurality of confession inserts.

7. finger continuous passive motion instrument according to claim 1, it is characterized in that, described second pulling device comprises rubber band and elongated rod, the front end of rubber band is connected with the finger tip of finger, the rear end of rubber band is connected with the front end of elongated rod, and the rear end of elongated rod is fixed on the root of the back of the hand or finger simultaneously.

8. the finger continuous passive motion instrument according to claim 1 or 7, is characterized in that, sheathed connector for connection on the finger tip of finger.

9. finger continuous passive motion instrument according to claim 1, is characterized in that, in the forearm that described housing is fixed on upper limb or wrist.