CA1036882A - Diffuser drape - Google Patents
Diffuser drapeInfo
- Publication number
- CA1036882A CA1036882A CA200,154A CA200154A CA1036882A CA 1036882 A CA1036882 A CA 1036882A CA 200154 A CA200154 A CA 200154A CA 1036882 A CA1036882 A CA 1036882A
- Authority
- CA
- Canada
- Prior art keywords
- clean air
- drape
- diffuser
- aperture
- duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/40—Apparatus fixed or close to patients specially adapted for providing an aseptic surgical environment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B46/00—Surgical drapes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/40—Apparatus fixed or close to patients specially adapted for providing an aseptic surgical environment
- A61B2090/401—Apparatus fixed or close to patients specially adapted for providing an aseptic surgical environment using air flow
Abstract
A B S T R A C T
The invention relates to diffuser drapes and has a particularly useful application in such drapes as those used in surgical operations. Early experiments met with difficulties in providing a diffuser drape which would pro-duce the necessary air patterns to keep the work surface clean and would not interfere with the regular activities of the operator. The diffuser drape comprises an apertured drape member with an inflatable clean air duct inte-gral with the drape and surrounding the aperture. The clean air duct has a diffuser in it which surrounds the aperture and is shaped to diffuse low veloc-ity clean air radially therethrough outwardly of the periphery and inwardly across the aperture from opposite sides thereof to produce a resultant flow away from the aperture. Two clean air inlets for the duct are provided on the underside of the drape member. The duct is preferably eliptical in shape and the inlets are sleeves which flare to merge tangentially into the duct.
The invention relates to diffuser drapes and has a particularly useful application in such drapes as those used in surgical operations. Early experiments met with difficulties in providing a diffuser drape which would pro-duce the necessary air patterns to keep the work surface clean and would not interfere with the regular activities of the operator. The diffuser drape comprises an apertured drape member with an inflatable clean air duct inte-gral with the drape and surrounding the aperture. The clean air duct has a diffuser in it which surrounds the aperture and is shaped to diffuse low veloc-ity clean air radially therethrough outwardly of the periphery and inwardly across the aperture from opposite sides thereof to produce a resultant flow away from the aperture. Two clean air inlets for the duct are provided on the underside of the drape member. The duct is preferably eliptical in shape and the inlets are sleeves which flare to merge tangentially into the duct.
Description
1036~82 The present invention relates to a diffuser drape for providing a clean work area, such as, for example, the wound site of a surgical opera-tion.
It has been proposed in the past to provide a clean area by posi-tioning clean air diffusers to diffuse clean air over a work surface and it has further been proposed to provide a clean air diffuser in a surgical drape.
The previous experimental attempts to provide a practical diffuser drape, however, met with tifficulties in integrating the diffuser into a drape in a fashion which provided the necessary clean air pattern without at the same time getting in the operator's way. Furthermore, with earlier proposals, the diffused air pattern frequently broke down because of regular activities by the operator.
According to the present invention a diffuser drape comprises a drape member having an aperture therein; inflatable clean air duct means attached to said drape and surrounding said aperture; said clean air duct means having dif-fuser means therein surrounding said aperture and shaped to diffuse, in opera-tion, low velocity clean air radially through said diffuser means inwardly across said aperture from opposite sides thereof to produce a resultant flow away therefroms and at least two clean air inlets for said clean air duct means on the underside of said drape member. According to a preferred feature of the invention the flow of clean air from the duct means is also outwardly of the periphery of the diffuser.
Another problem encountered with earlier experimental diffusers was how to avoid the jetting of air at the point where an inlet hose, or the like, encountered the diffuser and, according to a preferred feature of the invention, the clean air inlets comprise sleeve means which are widened as they approach the duct means and merge therewith.
Yet a further problem encountered with earlier proposals was to provide even distribution of air and, preferably, the clean air duct means is formed in a substantially elliptical shape. Preferably also the clean air 10368~Z
inlet sleeve means are flared to merge substantially tangentially into the duct means.
According to a further feature of the invention the clean air inlets, which comprises sleeve means, are obliquely inclined to the longitud-inal or transverse axis of the aperture and, in diffuser drapes used for abdominal surgery and the like, the sleeve means are preferably inclined at an angle of between 22 and 35 to the longitudinal axis of the aperture and preferably at an angle of 27 thereto.
The following is a tescription by way of example of one embodiment of the present invention, reference being had to the accompanying drawings in which: -Figure 1 is a di?gramtic underside plan view of a diffuser drape showing the diffuser means attached to the drape; and Figure 2 is a cross-section of the line II - II of Figure 1, look-ing in the direction of the arrows.
Referring now to the drawings, drape 10, which may be a surgical drape, is provided with an aperture 11 therein. The aperture 11 may be of square or round shape but as shown, i5 elliptical.
An inflatable clean air duct means 12 is sewn into the drape so as to become integral therewith and surrounds the aperture. The clean air duct is itself of substantially elliptical shape. ~ne duct has a diffuser 13 therein ~shown in dotted outline in Figure 2) and the diffuser is shaped so that, in operation, it will provide a current of clean air radially inwardly across the aperture as indicated by the arrows 14 in Figure 2. In the preferred config-uration, a current of clean air is also provided outwardly of the periphery of the diffuser, as indicated by the arrows 15 in Figure 2. The air pattern from the diffuser across the work space 16, from opposite sides thereof, which is the case of a surgical drape would be a patient's body, results, in known fashion, in an outwardly flow 18 of air away from the work surface 16.
The diffuser duct portion 12a is made of a similar material to the -1036~8Z ' material of the drape 10 whilst the diffuser 12b tdotted in Figure 2) may suit-ably be of a different material. The material of the duct portions 12a may be cotton of 140 to 180 threads per inch and the diffuser means 12b may be of a plain weave cotton material weighing 5.2 oz/yd sold under the Dominion Textiles trade name TQWN AND COUNTRY and having 50 threads per inch in the warp and 43 threads per inch in the weft.
With this configuration, and particularly when the duct portion 12a is of cotton about 140 threads per inch, a very slight diffusion (almost in the form of a leakage) takes place radially through the duct portion 12a as indi-cated by the arrows 13a. This minor diffusion can have beneficial effects in some applications. If unwanted, this minor diffusion may be reduced by doub-ling the number of layers of material or by making the material less permeable.
So that the air pattern will not break down in the event of the operation (perhaps a surgeon) leaning on the diffuser duct during operation, at least two inlets, or mouths 20, are provited integrally with, and of the same material as, the tuct portion 12a. The inlets comprise a widened sleeve portion merging with the diffuser duct, and in the elliptical configuration shown the widened sleeve means merge tangentially at 21 with the diffuser duct. The inlets continue outwardly at 22 from the aperture, on the underside of the drape. If the surgeon, or operator, collapses the diffuser means 13 by placing a hand or instrument on it at one point, air will still be provided to the diffuser as a whole because of the second inlet. For some types of func-tion it may be necessary to supply a third, or even a fourth, inlet.
Air is normally supplied by means of hoses from a clean air source which hoses are inserted into the upstream extensions 25 of the sleeves where the sleeves are tied by means of ties 26 around the hoses. The clean air source, which is positioned remotely from the drape, is of a type known ~ se.
It delivers clean air through the diffuser such that the air flow from the work space 16 is at about 100 ft/min (fpm). The velocities often used in the clean air art are 90 fpm plus or minor 20 fpm. In small diffusers such as shown, - 10~688Z
the range may be 90 fpm plus or minus 40 fpm. With an elliptical diffuser drape as seen in Figures 1 and 2 having a work space 16 of about 2 sq. ft., the volume of clean air supplied would be about 200 cfm.
The widening of the inlet to provide a smooth merging with the duct-ing is an important preferred feature of the invention because it provides for the smooth diffusion of air into the duct means. Furthermore, the substantial-ly elliptical shape of the diffuser and the duct means is also an important preferret feature because unlike a rectangular configuration it provides for a smooth and even flow of air and an even distribution of air through the diffuser.
As shown in Figure 1 the drape 10 is a surgical drape for abdominal surgery the sleeve means 22 are inclined at the oblique angle to the longitud-inal axis 28 and the traverse axis 29 of the aperture 11. This also is an important preferred feature of the invention for this type of use because it provides a configuration in which the clean air can be delivered to the aper-ture ll without the hoses getting in the way of the operator.
It has been found that for abdominal surgery the angle o~ of the center line of the sleeve from the longitudinal axis should be between 22 and 35 and with the optimum angle being 27.
It has been proposed in the past to provide a clean area by posi-tioning clean air diffusers to diffuse clean air over a work surface and it has further been proposed to provide a clean air diffuser in a surgical drape.
The previous experimental attempts to provide a practical diffuser drape, however, met with tifficulties in integrating the diffuser into a drape in a fashion which provided the necessary clean air pattern without at the same time getting in the operator's way. Furthermore, with earlier proposals, the diffused air pattern frequently broke down because of regular activities by the operator.
According to the present invention a diffuser drape comprises a drape member having an aperture therein; inflatable clean air duct means attached to said drape and surrounding said aperture; said clean air duct means having dif-fuser means therein surrounding said aperture and shaped to diffuse, in opera-tion, low velocity clean air radially through said diffuser means inwardly across said aperture from opposite sides thereof to produce a resultant flow away therefroms and at least two clean air inlets for said clean air duct means on the underside of said drape member. According to a preferred feature of the invention the flow of clean air from the duct means is also outwardly of the periphery of the diffuser.
Another problem encountered with earlier experimental diffusers was how to avoid the jetting of air at the point where an inlet hose, or the like, encountered the diffuser and, according to a preferred feature of the invention, the clean air inlets comprise sleeve means which are widened as they approach the duct means and merge therewith.
Yet a further problem encountered with earlier proposals was to provide even distribution of air and, preferably, the clean air duct means is formed in a substantially elliptical shape. Preferably also the clean air 10368~Z
inlet sleeve means are flared to merge substantially tangentially into the duct means.
According to a further feature of the invention the clean air inlets, which comprises sleeve means, are obliquely inclined to the longitud-inal or transverse axis of the aperture and, in diffuser drapes used for abdominal surgery and the like, the sleeve means are preferably inclined at an angle of between 22 and 35 to the longitudinal axis of the aperture and preferably at an angle of 27 thereto.
The following is a tescription by way of example of one embodiment of the present invention, reference being had to the accompanying drawings in which: -Figure 1 is a di?gramtic underside plan view of a diffuser drape showing the diffuser means attached to the drape; and Figure 2 is a cross-section of the line II - II of Figure 1, look-ing in the direction of the arrows.
Referring now to the drawings, drape 10, which may be a surgical drape, is provided with an aperture 11 therein. The aperture 11 may be of square or round shape but as shown, i5 elliptical.
An inflatable clean air duct means 12 is sewn into the drape so as to become integral therewith and surrounds the aperture. The clean air duct is itself of substantially elliptical shape. ~ne duct has a diffuser 13 therein ~shown in dotted outline in Figure 2) and the diffuser is shaped so that, in operation, it will provide a current of clean air radially inwardly across the aperture as indicated by the arrows 14 in Figure 2. In the preferred config-uration, a current of clean air is also provided outwardly of the periphery of the diffuser, as indicated by the arrows 15 in Figure 2. The air pattern from the diffuser across the work space 16, from opposite sides thereof, which is the case of a surgical drape would be a patient's body, results, in known fashion, in an outwardly flow 18 of air away from the work surface 16.
The diffuser duct portion 12a is made of a similar material to the -1036~8Z ' material of the drape 10 whilst the diffuser 12b tdotted in Figure 2) may suit-ably be of a different material. The material of the duct portions 12a may be cotton of 140 to 180 threads per inch and the diffuser means 12b may be of a plain weave cotton material weighing 5.2 oz/yd sold under the Dominion Textiles trade name TQWN AND COUNTRY and having 50 threads per inch in the warp and 43 threads per inch in the weft.
With this configuration, and particularly when the duct portion 12a is of cotton about 140 threads per inch, a very slight diffusion (almost in the form of a leakage) takes place radially through the duct portion 12a as indi-cated by the arrows 13a. This minor diffusion can have beneficial effects in some applications. If unwanted, this minor diffusion may be reduced by doub-ling the number of layers of material or by making the material less permeable.
So that the air pattern will not break down in the event of the operation (perhaps a surgeon) leaning on the diffuser duct during operation, at least two inlets, or mouths 20, are provited integrally with, and of the same material as, the tuct portion 12a. The inlets comprise a widened sleeve portion merging with the diffuser duct, and in the elliptical configuration shown the widened sleeve means merge tangentially at 21 with the diffuser duct. The inlets continue outwardly at 22 from the aperture, on the underside of the drape. If the surgeon, or operator, collapses the diffuser means 13 by placing a hand or instrument on it at one point, air will still be provided to the diffuser as a whole because of the second inlet. For some types of func-tion it may be necessary to supply a third, or even a fourth, inlet.
Air is normally supplied by means of hoses from a clean air source which hoses are inserted into the upstream extensions 25 of the sleeves where the sleeves are tied by means of ties 26 around the hoses. The clean air source, which is positioned remotely from the drape, is of a type known ~ se.
It delivers clean air through the diffuser such that the air flow from the work space 16 is at about 100 ft/min (fpm). The velocities often used in the clean air art are 90 fpm plus or minor 20 fpm. In small diffusers such as shown, - 10~688Z
the range may be 90 fpm plus or minus 40 fpm. With an elliptical diffuser drape as seen in Figures 1 and 2 having a work space 16 of about 2 sq. ft., the volume of clean air supplied would be about 200 cfm.
The widening of the inlet to provide a smooth merging with the duct-ing is an important preferred feature of the invention because it provides for the smooth diffusion of air into the duct means. Furthermore, the substantial-ly elliptical shape of the diffuser and the duct means is also an important preferret feature because unlike a rectangular configuration it provides for a smooth and even flow of air and an even distribution of air through the diffuser.
As shown in Figure 1 the drape 10 is a surgical drape for abdominal surgery the sleeve means 22 are inclined at the oblique angle to the longitud-inal axis 28 and the traverse axis 29 of the aperture 11. This also is an important preferred feature of the invention for this type of use because it provides a configuration in which the clean air can be delivered to the aper-ture ll without the hoses getting in the way of the operator.
It has been found that for abdominal surgery the angle o~ of the center line of the sleeve from the longitudinal axis should be between 22 and 35 and with the optimum angle being 27.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A diffuser drape comprising a drape member having an aperture therein; inflatable clean air duct means integral with said drape and surround-ing said aperture; said clean air duct means having diffuser means therein surrounding said aperture and shaped to diffuse, in operation, low velocity clean air radially through the diffuser means inwardly across said aperture from opposite sides thereof to provide a resultant flow away therefrom; and at least two clean air inlets for said clean air duct means on the underside of said drape member.
2. A diffuser drape comprising a drape member having an aperture therein; inflatable clean air duct means integral with said drape and surround-ing said aperture; said clean air duct means having diffuser means therein surrounding said aperture and shaped to diffuse, in operation, low velocity clean air radially through the diffuser means outwardly of the periphery thereof and inwardly across said aperture from opposite sides thereof to pro-duce a resultant flow away therefrom; and at least two clean air inlets for said clean air duct means on the underside of said drape member.
3. A diffuser drape as claimed in claim 1 or claim 2 in which the air duct means is of a material which; in operation, diffuses a small amount of clean air radially therethrough in addition to the air through the diffuser means.
4. A diffuser drape as claimed in claim 1 or claim 2 in which said clean air inlets comprises sleeve means widened as they approach said duct means to merge therewith.
5. A diffuser drape as claimed in claim 2 in which said clean air duct means is substantially elliptical in shape.
6. A diffuser drape as claimed in claim 5 in which said clean air inlets are sleeve means flared to merge substantially tangentially into said duct means.
7. A diffuser drape as claimed in claim 5 in which said clean air inlets comprise sleeve means which are obliquely inclined to a longitudinal or transverse axis of said aperture.
8. A diffuser drape as claimed in claim 5 in which said clean air inlets comprise sleeve means inclined at an angle of between 22° and 35° to the longitudinal axis of said aperture.
9. A diffuser drape as claimed in claim 8 in which said sleeve means are inclined at an angle of 27° to the longitudinal axis of said aperture.
10. A diffuser drape comprising: (a) a drape member having a sub-stantially elliptical aperture therein; (b) an inflatable clean air duct of substantially elliptical shape integral with said drape and surrounding said aperture; (c) a clean air diffuser in said clean air duct surrounding said aperture and shaped to diffuse, in operation, low velocity clean air radially through the diffuser outwardly of the periphery thereof and inwardly across said aperture from opposite sides thereof to produce a resultant flow away therefrom; and (d) at least two opposed clean air inlets for said clean air duct on the underside of said drape member, which clean air inlets are sleeve members flared to merge substantially tangentially into said duct and inclined at an angle of between 22° and 35° to the longitudinal axis of said aperture.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA200,154A CA1036882A (en) | 1974-05-16 | 1974-05-16 | Diffuser drape |
| US471886A US3927667A (en) | 1974-05-16 | 1974-05-21 | Diffuser drape |
| GB18812/75A GB1501934A (en) | 1974-05-16 | 1975-05-05 | Clean air diffuser drape |
| DE19752521186 DE2521186A1 (en) | 1974-05-16 | 1975-05-13 | DIFFUSER CLOTH TO CREATE A CLEAN WORK SURFACE, E.g. A CLEAN WOUND AREA DURING SURGICAL OPERATIONS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA200,154A CA1036882A (en) | 1974-05-16 | 1974-05-16 | Diffuser drape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1036882A true CA1036882A (en) | 1978-08-22 |
Family
ID=4100095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA200,154A Expired CA1036882A (en) | 1974-05-16 | 1974-05-16 | Diffuser drape |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3927667A (en) |
| CA (1) | CA1036882A (en) |
| DE (1) | DE2521186A1 (en) |
| GB (1) | GB1501934A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1070584A (en) * | 1978-05-24 | 1980-01-29 | Her Majesty The Queen, In Right Of Canada, As Represented By The Minister Of National Defence | Elliptical diffuser drape |
| US4248216A (en) * | 1979-05-16 | 1981-02-03 | Glintz Georgia E | Disposable stretcher care sheet |
| US4334529A (en) * | 1981-04-14 | 1982-06-15 | Caroline G. Wirth | Wirth's sterile, disposable surgical drape |
| US20060206051A1 (en) * | 2005-03-01 | 2006-09-14 | Hamilton Dwight A | Gas irrigator for surgical procedures |
| US8409129B2 (en) | 2009-05-01 | 2013-04-02 | Nimbic Systems, Inc. | Apparatus for reducing contamination of surgical site |
| EP3236861A4 (en) * | 2014-12-23 | 2018-08-01 | Fisher&Paykel Healthcare Limited | Wound retractor and diffuser |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2305289A (en) * | 1939-06-17 | 1942-12-15 | Coburg Hermann | Surgical appliance |
| US3610238A (en) * | 1970-04-28 | 1971-10-05 | Us Health Education & Welfare | Wound infection prevention device |
| US3692024A (en) * | 1970-10-16 | 1972-09-19 | Robert E Von Otto | Surgical appliance |
| CA943317A (en) * | 1971-01-25 | 1974-03-12 | Howorth (James) And Company Limited | Operating theatres |
| US3763857A (en) * | 1972-04-24 | 1973-10-09 | Kimberly Clark Co | Surgical drape |
-
1974
- 1974-05-16 CA CA200,154A patent/CA1036882A/en not_active Expired
- 1974-05-21 US US471886A patent/US3927667A/en not_active Expired - Lifetime
-
1975
- 1975-05-05 GB GB18812/75A patent/GB1501934A/en not_active Expired
- 1975-05-13 DE DE19752521186 patent/DE2521186A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB1501934A (en) | 1978-02-22 |
| US3927667A (en) | 1975-12-23 |
| DE2521186A1 (en) | 1975-11-27 |
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