AU2118399A - Adjustable splint - Google Patents

Description

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR OFFICE USE Short Title: Int. Cl: Application Number: Lodged: Complete Specification-Lodged: Accepted: Lapsed: Published: Priority: Related Art: TO BE COMPLETED BY APPLICANT Name of Applicant: Dr. Jimmy Phong Xuan Nguyen Address of Applicant: 81 Childs Road, CHIPPING NORTON NSW 2170 Actual Inventor: AS ABOVE Address for Service: ANDERSON-TAYLOR ASSOCIATES, Registered Patent Attorneys of 10 Harrison Avenue BONNET BAY N.S.W. 2226 Complete Specification for the invention entitled: ADJUSTABLE SPLINT The following statement is a full description of this invention, including the best method of performing it known to me: -1- This invention relates to medical apparatus. More particularly although not exclusively it discloses an improved adjustable splint for bone fractures, dislocations of joints, soft tissue injury and ligament ruptures of the fingers or toes.

Existing splints for the finger or toe typically comprise a strip of aluminium with a layer of foam padding on one side.

The strip is folded lengthwise over one end and extends onto the palm. The device is then secured in place using tape or the like. Although the finger itself may be held reasonably straight by the splint there is little restraint against lateral movement. Also, due to the use of tape (elastoplaster) to secure the splint against the hand there is inadequate immobilisation and a certain amount of flexion and extension movement about the base of the finger can take place. As splints usually have to be in place for 2 4 weeks the use of tape or elastoplaster has several other disadvantages. For example it can cause skin allergic reactions due to the adhesive and sweating of the hand. The tape can fall off become dirty or develop an offensive odor.

It can lose its adhesive properties after a few days especially if it gets wet by water or perspiration. For these reasons the tape adhesive is commonly replaced by the practitioner after several days of use and this increases the cost of maintaining the splint. During removal of the splint the adhesive property of the tape causes pain and discomfort for the wearer. For certain injuries such as dislocation and -2stable fracture it it often recommended to allow the finger joint to mobilise several times a day to prevent stiffness.

However the use of tape has often rendered this impractical and impossible without visits to the doctor to reapply the splint. The end of the aluminium strip protruding into the wearer's palm is also a source of discomfort and has been known to cause abrasion over the 2 4 weeks or so that the splint has to be worn. Prior art aluminum splints have to be cut to a suitable length using a "metal wire cutter" and have to be applied by a physici-an with the appropriate instruments. Further, the cost of these prior art splints is high. In addition to provision of the relatively expensive aluminium strip a layer of high quality foam padding has to be affixed along the inner side of the splint as a seperate :step in manufacture.

In the applicant's earlier Australian patent applications a form of low cost one piece moulded splint is disclosed which overcomes many of the aforementioned disadvantages.

It is an object of the present invention to provide further improvements in the form of a splint which is adjustable and reusable and can be assembled by a medical practioner, nurse or patient in any one of a range of configurations determined by the location of the fracture.

It is envisaged that this splint in emergency situations may even be applied prior to attending a doctors surgery.

I N M Preferably said splint comprises an anchor plate for abutting the wearer's palm or sole and an elongated fracture support member, the support member being engagable with the anchor plate at any one of a range of positions so as to align with the particular fracture to be set.

One currently preferred form of this invention will now be described with reference to the attached drawings in which: Figure 1 shows plan and end elevation views of the anchor plate component, Figure 2 shows plan and side elevation views of a fracture support component adapted for use with a finger, Figure 3 shows the aforementioned splint components when assembled, and Figure 4 shows plan and end elevation views of an adapter for the splint, Figures 5 and 5A show plan and side views of a second embodiment of a splint according to this invention, Figure 6 shows plan and side views of a finger rest for use with the splint of figure 5, and Figure 7 shows plan and side views of a second form of adapter for use with the splint of figure and Figure 8 shows an underside perspective view of the splint of figure 5 when fitted to a finger fracture.

-4- Although these drawings depict the splint as applied to a finger fracture it could similarly within the scope of this invention be applied to a toe fracture.

Referring first to figure 1 the anchor plate (indicated generally as item 1) may be rectangular with rounded corners 2 to reduce abrasion on the wearer's palm or sole. Although with this embodiment the plate is about 70 mm square and 2 mm thick the invention extends to other sizes and shapes.

Preferably the plate, as with the other components of the splint, is formed from any type of low cost and readily mouldable plastic such as Polypropylene. A series of apertures 3 are arranged in parallel rows across the width of the plate. There is also a central pin 4 extending from the upper face 5 of the plate.

o• The fracture support member indicated generally as item 6 in figure 2 comprises an elongated channel portion 7 which with this embodiment is shaped to cradle the human finger. There oare slots 8 formed in the sides 9 of this channel to receive one or more velcro fastening strips (not shown). These strips may be tightened as required to close the walls of the channel sufficiently to embrace the fracture and immobilise it. The use of velcro as opposed to close fitting adhesive tape has also been found to increase ventilation and reduce allergic reactions. The channel portion 7 is connected to a lower base portion 10 by means of a substantially rigid spine member 11. This lower portion 10 is adapted for a snap fit

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engagement onto the underside 12 of the anchor plate 1 as shown in figure 3. More specifically, it includes a set of four pins 13 which are shaped and positioned to press into corresponding sets of the apertures 3 in the anchor plate.

While the support member 6 is shown by way of example here at the extreme right-hand position, the repeating rows of apertures 3 in the anchor plate enable the support member to be fitted at any one of a range of positions across this plate in accordance with the location of the fractured finger. Although not shown in the drawings the underside 12 of the anchor plate 1 is clamped against the wearer's palm using any suitable form of tape or straps which extend around the hand and attach to the pin 4. Those apertures 3 which are not engaged by the pins 13 remain open for ventilation to increase wearer comfort.

*o As a further preferred feature of this invention a seperate adapter 16 as shown in figure 4 may be provided. This comprises a plate which may be similar in size and shape to *the base portion 10 of the fracture support member described earlier. With this embodiment there are five apertures 17 formed in the adapter and four pins 18 as shown. It may thus be fitted onto the underside 12 of the anchor plate at various positions in a manner similar to that of the fracture support member 6. In this case however two parallel slots 19 are provided one adjacent each end of the adapter. A length of malleable strip (not shown) may be fitted through these slots so that one end thereof would extend up to support the fracture in place of the substantially straight channel member 7 referred to earlier. Use of this adapter would allow a finger to be immobilised in a bent configuration as is sometimes required with such fractures. The unused apertures of the adapter together with those of the anchor plate would remain open for air ventilation.

Preferably the lower base portion 10 shown in figure 2 may also be provided with a strip receiving slot 20 to enable it to be used in the manner of an adapter when detached from the channel portion 7.

A second embodiment of a splint according to this invention S is shown in figure 5 to 8. Here the main components that correspond in function to those of figures 1 to 4 are marked by the same number but with the addition of an accent The anchor plate 1' is generally of the same shape and configuration as that of the first embodiment except that there are five rows of apertures 3' instead of the three shown in figure 3. The fracture support member 6' with this

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second embodiment also includes a mechanical hinge connection 21 between the channel portion 7' and the lower base portion instead of the rigid spine of the first embodiment. This hinge preferably comprises a sleeve 22 attached to the base portion 10' by a ribs 23. The sleeve locates on an eight sided hinge pin 24 which attaches to the channel portion 7' by a second rib 25. The base portion 10' snap fits onto the underside of the anchor plate 1' in the same manner as with the first embodiment. The hinge however allows the fractured finger to be set by a physician at any desired angle to the palm There are a series of plastic hinge lines 26 extending along the length of the channel 7' on each side. These allow the sides 9' to be closely formed around and support different sized fingers. There are also a series of ventilation holes 27 in the sides To enable the channel 7' to be easily truncated to fit different finger lengths a series of break or cutting lines 28 may be formed transversely to its length.

As a further improvement provision may also be made for imposing a predetermined flexion at any point along the length of a fractured finger. This as shown in figure 6 comprises a finger rest member 29 with a curved centre !portion 30 and planar end portions 31. Each of these end portions includes ribs 32 which engage in a series of centrally located transverse slots 33 along the length of the bottom 7A of channel The rest member 29 may thus be snap fitted onto the channel 7' under any part of the finger to impose a preset degree of flexion during the healing process.

As with the first embodiment the channel 7' would preferably oa be held in place around the finger and palm 25A using velcro or Polyurethane rubber straps 33A, 33B.

If required the end section A as shown in figure 5 may be broken off and used separately as a splint without the anchor plate 1'.

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A modified form of adapter 16' to enable a malleable strip to be fitted to the anchor plate 1' ,is shown in figure 7. The basic function here is the same as that of the adapter shown in figure 4. However a longitudinal slot 34 is now provided to receive the malleable strip. There is also five rows of apertures 17 and pins 18' to enable a snap fit onto the anchor plate 1' instead of three with the first embodiment.

It will thus be appreciated that this invention at least in i the form of the embodiment described provides a novel and low o*o *cost adjustable splint for finger fractures. The advantages of this splint may be summarised as follows: Practical Water resistant Non allergic May be easily applied in emergency situations without the assistance of a medical personnel Provides immobilisation of both horiziontal and vertical movement of joints and also the small bones of the hands to minimise pain and discomfort Provides better immobilisation of thumb and fifth digits due to the extra support from the base plate and the arrangement of the Velcro strapping system The splint adapter allows conventional aluminum strips to be used to immobilise a joint at an adequate flexion or extension angle.

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-Can be used to set multiple fractures at different flexion angles by fitting two support members 6' to an anchor plate 1' The use of strapping Velcro) provides the following additional advantages: Odorless Splint can be removed and reapplied easily Allows injured finger to be placed verLically on the support splint rather than pushed into a "U" shaped aluminium splint.

e* Removal is simple and painless as no adhesive is used Because of increased comfort there would be less patient resistance to full term use of the splint Clearly however the example disclosed is only the currently preferred form of this invention and a wide variety of modifications may be made which would be apparent to a person skilled in the art. For example, the shape and configuration of the fracture support member and anchor plate may be changed according to design preference or to adapt the splint for use with toe fractures. Also, other means of connection between the splint components may be used within the scope of this invention.

Although not shown in the drawings foam is preferably applied to the side of the base plate abutting the palm.

Claims (11)

1. An adjustable splint for fractures and other injuries of the finger ot toe, said splint including an anchor plate adapted to be secured against a wearer's palm or sole and an elongated fracture support member which is engagable with said anchor plate at any one of a range of positions to align with the finger or toe fracture to be set.

2. The adjustable splint as claimed in claim 1 wherein said elongated fracture support member comprises a channel portion -which is shaped to cradle and immobilise said finger or toe fracture and a lower base portion which is engagable with said anchor plate.

3. The adjustable splint as claimed in claim 2 wherein said lower base portion includes a set of pins which are shaped and positioned to press into corresponding sets of apertures repeating across said anchor plate to enable said base portion to engage with said anchor plate at said any one of a range of positions.

4. The adjustable splint as claimed in claim 3 wherein said channel portion is linked to said lower base portion by a mechanical hinge connection.

The adjustable splint as claimed in claim 4 wherein said mechanical hinge connection comprises a sleeve attached to -11- the base portion by a first rib, said sleeve being securable at a selected one of a range of angular positions on a pin attached to said channel portion by a second rib.

6. The adjustable splint as claimed in claim 5 wherein a series of plastic hinges are formed along sides of the channel portion to allow said sides to be formed around said finger or toe fracture.

7. The adjustable splint as claimed in claim 6 wherein a series of transverse breaking or cutting lines are formed across said channel portion to enable said channel portion to be truncated to fit said finger or toe fracture.

8. The adjustable splint as claimed in claim 7 wherein a series of ventilation holes are formed in the sides of said channel portion. :'Si

9. The adjustable splint as claimed in claim 8 wherein a series of transverse slots are formed along the bottom of the channel member to enable a rest member to be snap fitted into said channel to impose a preset degree of flexion onto said finger or toe fracture during the healing process.

The adjustable splint as claimed in claim 9 wherein said anchor plate is rectangular with rounded corners.

11. The adjustable splint as claimed in claim 10 and -12- including one or more velcro straps for holding said splint in place on the wearer's hand or foot. Dated this d day of 1999 Dr. Jimmy Phong Xuan Nguyen By his Patent Attorney MICHAEL. amnDERSOnrrAyLOR -13-