CA2499217A1 - Surgical tool for removal of brain stem - Google Patents
Surgical tool for removal of brain stem Download PDFInfo
- Publication number
- CA2499217A1 CA2499217A1 CA 2499217 CA2499217A CA2499217A1 CA 2499217 A1 CA2499217 A1 CA 2499217A1 CA 2499217 CA2499217 CA 2499217 CA 2499217 A CA2499217 A CA 2499217A CA 2499217 A1 CA2499217 A1 CA 2499217A1
- Authority
- CA
- Canada
- Prior art keywords
- operating portion
- face
- cutting
- handle
- metal body
- 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.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B10/00—Other methods or instruments for diagnosis, e.g. instruments for taking a cell sample, for biopsy, for vaccination diagnosis; Sex determination; Ovulation-period determination; Throat striking implements
- A61B10/02—Instruments for taking cell samples or for biopsy
- A61B10/0233—Pointed or sharp biopsy instruments
- A61B10/0266—Pointed or sharp biopsy instruments means for severing sample
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pathology (AREA)
- General Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Public Health (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A method for extracting at least a sample of the brain stem of an animal for testing is carried out using a metal tool having a tubular handle portion of the metal body and a part tubular operating portion of the metal body defining a blade and scoop, inserting the operating portion while holding the handle into the cranial cavity of the head of the animal through the foramen magnum, rotating the tool to sever the cranial nerves and withdrawing the tool with the brain stem cradled in the operating portion.
Description
r~9 SURGICAL TOOL FOR REMOVAL OF BRAlN STEM
This invention relates to a tool for removing the brain stem of an animal for testing for example for BSE.
BACKGROUND OF THE INVENTION
In testing for various diseases in slaughtered animals, it is common that samples are required. For testing for BSE, only the brain stem (most importantly the obex) is required to be submit#ed for BSE diagnosis.
Typically the sample is removed using a post mortem knife in which the head is disarticulated from the carcass at the atlanto-occipital joint.
The head is oriented on a table or work surface with the dorsal side down and with the foramen magnum facing the operator. Using scissors and forceps, the dura matter is removed through the foramen magnum opening to expose the medulla.
A brain knife is inserted into the cranial cavity through the foramen magnum using a side to side slicing motion until a tip of the knife contacts bone.
The knife blade is maintained parallel to the dorsal surface of the brain stem but ventral to the cerebellum. The knife blade is rotated and carefully pushed aside the cerebellum and the knife removed. A spatula is inserted through the foramen magnum with the spatula blade facing laterally. The blade is pushed until the staff of the spatula is approximately 2/3 into the cranial cavity and the blade is rotated ventrally and then dorsally severing the brain stem. The cordal end of the brain stem is grasped using forceps and pulled with the spatula and the forceps thus removing the brain stem.
This invention relates to a tool for removing the brain stem of an animal for testing for example for BSE.
BACKGROUND OF THE INVENTION
In testing for various diseases in slaughtered animals, it is common that samples are required. For testing for BSE, only the brain stem (most importantly the obex) is required to be submit#ed for BSE diagnosis.
Typically the sample is removed using a post mortem knife in which the head is disarticulated from the carcass at the atlanto-occipital joint.
The head is oriented on a table or work surface with the dorsal side down and with the foramen magnum facing the operator. Using scissors and forceps, the dura matter is removed through the foramen magnum opening to expose the medulla.
A brain knife is inserted into the cranial cavity through the foramen magnum using a side to side slicing motion until a tip of the knife contacts bone.
The knife blade is maintained parallel to the dorsal surface of the brain stem but ventral to the cerebellum. The knife blade is rotated and carefully pushed aside the cerebellum and the knife removed. A spatula is inserted through the foramen magnum with the spatula blade facing laterally. The blade is pushed until the staff of the spatula is approximately 2/3 into the cranial cavity and the blade is rotated ventrally and then dorsally severing the brain stem. The cordal end of the brain stem is grasped using forceps and pulled with the spatula and the forceps thus removing the brain stem.
A tool specifically designed for this process is shown in US Patent application 2002/0002375 published January 23, 2002. This provides a spatula formed of plastic with a handle and the spoon section with a sharpened leading edge. The spoon has proven to be generally unsatisfactory and is unpopular with persons required to carry out this function. The spoon cannot operate on frozen or partially frozen heads due to the weakness of the plastics material, bearing in mind that the carcass can be frozen in many cases due to the surrounding cold weather.
SUMMARY OF THE INVENTION
It is one object of the invention to provide an improved tool and method for removing the brain stem of an animal for testing.
According to one aspect of the invention there is provided a tool for extracting at least a sample of the brain stem of an animal for testing comprising:
a metal body;
the metal body being formed from a metal tube;
a handle portion of the metal body being tubular to define a circular end face at one end of the metal body onto which hammering force can be applied;
and an operating portion of the metal body defining a blade and scoop for cutting the brain stem sample and carrying the brain stem sample from the animal;
the operating portion being defined by cutting an part of the cylinder defining the tube from the tube and along the length of the operating portion up to an end of the handle portion such that the operating portion is part cylindrical and integral with the handle part;
a part circular cutting end face of the operating portion and at least a part of the length of the side edges extending from the end face toward the handle portion of the operating portion being sharpened to form a cutting edge.
Preferably the operating portion tapers from the handle portion to the end face.
Preferably the operating portion tapers from the handle portion to the end face such that at the end of the handle portion the operating portion subtends and angle of the order of 180 degrees and at the cutting end face the operating portion subtends and angle of the order of 120 degrees.
Preferably the side edges of the operating portion are sharpened approximately half way from the end cutting face to the handle portion.
According to a second aspect of the invention there is provided a method for extracting at least a sample of the brain stem of an animal for testing comprising:
providing a metal body having;
the metal body being formed from a metal tube;
a handle portion of the metal body being tubular to define a circular end face at one end of the metal body onto which hammering force can be applied;
and an operating portion of the metal body defining a blade and scoop for cutting the brain stem sample and carrying the brain stem sample from the animal;
SUMMARY OF THE INVENTION
It is one object of the invention to provide an improved tool and method for removing the brain stem of an animal for testing.
According to one aspect of the invention there is provided a tool for extracting at least a sample of the brain stem of an animal for testing comprising:
a metal body;
the metal body being formed from a metal tube;
a handle portion of the metal body being tubular to define a circular end face at one end of the metal body onto which hammering force can be applied;
and an operating portion of the metal body defining a blade and scoop for cutting the brain stem sample and carrying the brain stem sample from the animal;
the operating portion being defined by cutting an part of the cylinder defining the tube from the tube and along the length of the operating portion up to an end of the handle portion such that the operating portion is part cylindrical and integral with the handle part;
a part circular cutting end face of the operating portion and at least a part of the length of the side edges extending from the end face toward the handle portion of the operating portion being sharpened to form a cutting edge.
Preferably the operating portion tapers from the handle portion to the end face.
Preferably the operating portion tapers from the handle portion to the end face such that at the end of the handle portion the operating portion subtends and angle of the order of 180 degrees and at the cutting end face the operating portion subtends and angle of the order of 120 degrees.
Preferably the side edges of the operating portion are sharpened approximately half way from the end cutting face to the handle portion.
According to a second aspect of the invention there is provided a method for extracting at least a sample of the brain stem of an animal for testing comprising:
providing a metal body having;
the metal body being formed from a metal tube;
a handle portion of the metal body being tubular to define a circular end face at one end of the metal body onto which hammering force can be applied;
and an operating portion of the metal body defining a blade and scoop for cutting the brain stem sample and carrying the brain stem sample from the animal;
the operating portion being defined by cutting an part of the cylinder defining the tube from the tube and along the length of the operating portion up to an end of the handle portion such that the operating portion is part cylindrical and integral with the handle part;
a part circular cutting end face of the operating portion and at least a part of the length of the side edges extending from the end face toward the handle portion of the operating portion being sharpened to form a cutting edge;
inserting the operating portion while holding the handle into the cranial cavity of the head of the animal through the foramen magnum;
rotating the tool to sever the cranial nerves;
and withdrawing the tool with the brain stem cradled in the operating portion.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of the invention will now be described in conjunction with the accompanying drawings in which:
Figure 1 is an isometric view of a tool according to the present invention.
Figure 2 is a top plan view of the tool of Figure 1.
Figure 3 is a side elevational view of the tool of Figure 1.
In the drawings like characters of reference indicate corresponding parts in the different figures.
DETAILED DESCRIPTION
The tool according to the present invention is shown in Figures 1 2 and 3 and comprises a tubular body 10 including a handle portion 11 and an operating portion 12. The tubular body is cut from a single piece of pipe or tube of stainless 5 steel or other suitable non corrosive metal so that the handle portion 11 and the operating portion 12 are integral. The handle portion 11 forms a full periphery of the tubular member so that it is cylindrical in shape with a circular end face 13.
The operating portion is formed by cutting partway across the tube to form a face which is part circular and extends around approximately 180° of arc of the tubular member. From that face 14, a further cut extends along the tube from the face 14 to an end cutting face 15 of the operating portion.
Thus the operating portion 12 is formed as a part cylindrical portion which tapers slightly from 180° of arc at the face 14 to the end cutting face 15 which is arranged to be approximately 120° of arc.
Thus the cutting action forms two side edges 16 and 17 of the part cylindrical portion which forms a scoop and a blade for the cutting action.
The edges 16 and 17 are then sharpened by grinding as indicated at 19 and 20 to form sharpened edges along the sides 16 and 17 and through the cutting end face 15.
The sharpening action is applied on the inside surface so that the outside surface is sharp and forms a part cylindrical cutting blade extending approximately one half way along the operating portion to a mid line generally indicated at 21.
The tool is used on the head with the ventral side down such that the foramen magnum is facing the operator. Using forceps and scissors, a single cut is made down the center of the exposed dura matter creating two flaps. Holding the dura mater with the forceps to expose the cranial nerves exiting the spinal cord, the cranial nerves are severed from the spinal cord thus freeing the spinal cord and facilitating the removal of the obex using the tool herein.
With the tool having the channel or receptacle facing downwardly, it is inserted through the foramen magnum moving it forwardly and lodging the tip between the cerebellum and the brain stem-spinal cord. Applying downward pressure on the tool, it is moved from side to side as a rotating action over the spinal cord to sever it from the rest of the brain. The channel is used to pull the severed portion of the brain stem from the foramen magnum.
The tool with the metal sharp edges provides an effective cutting action to ensure that the nerves are properly cut and the required part removed. Even in a frozen condition, the tool can be inserted and if necessary a hammering force can be applied onto the end face of the handle to drive the tool using the cutting edge into the required position.
Since various modifications can be made in my invention as herein above described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without department from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
a part circular cutting end face of the operating portion and at least a part of the length of the side edges extending from the end face toward the handle portion of the operating portion being sharpened to form a cutting edge;
inserting the operating portion while holding the handle into the cranial cavity of the head of the animal through the foramen magnum;
rotating the tool to sever the cranial nerves;
and withdrawing the tool with the brain stem cradled in the operating portion.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of the invention will now be described in conjunction with the accompanying drawings in which:
Figure 1 is an isometric view of a tool according to the present invention.
Figure 2 is a top plan view of the tool of Figure 1.
Figure 3 is a side elevational view of the tool of Figure 1.
In the drawings like characters of reference indicate corresponding parts in the different figures.
DETAILED DESCRIPTION
The tool according to the present invention is shown in Figures 1 2 and 3 and comprises a tubular body 10 including a handle portion 11 and an operating portion 12. The tubular body is cut from a single piece of pipe or tube of stainless 5 steel or other suitable non corrosive metal so that the handle portion 11 and the operating portion 12 are integral. The handle portion 11 forms a full periphery of the tubular member so that it is cylindrical in shape with a circular end face 13.
The operating portion is formed by cutting partway across the tube to form a face which is part circular and extends around approximately 180° of arc of the tubular member. From that face 14, a further cut extends along the tube from the face 14 to an end cutting face 15 of the operating portion.
Thus the operating portion 12 is formed as a part cylindrical portion which tapers slightly from 180° of arc at the face 14 to the end cutting face 15 which is arranged to be approximately 120° of arc.
Thus the cutting action forms two side edges 16 and 17 of the part cylindrical portion which forms a scoop and a blade for the cutting action.
The edges 16 and 17 are then sharpened by grinding as indicated at 19 and 20 to form sharpened edges along the sides 16 and 17 and through the cutting end face 15.
The sharpening action is applied on the inside surface so that the outside surface is sharp and forms a part cylindrical cutting blade extending approximately one half way along the operating portion to a mid line generally indicated at 21.
The tool is used on the head with the ventral side down such that the foramen magnum is facing the operator. Using forceps and scissors, a single cut is made down the center of the exposed dura matter creating two flaps. Holding the dura mater with the forceps to expose the cranial nerves exiting the spinal cord, the cranial nerves are severed from the spinal cord thus freeing the spinal cord and facilitating the removal of the obex using the tool herein.
With the tool having the channel or receptacle facing downwardly, it is inserted through the foramen magnum moving it forwardly and lodging the tip between the cerebellum and the brain stem-spinal cord. Applying downward pressure on the tool, it is moved from side to side as a rotating action over the spinal cord to sever it from the rest of the brain. The channel is used to pull the severed portion of the brain stem from the foramen magnum.
The tool with the metal sharp edges provides an effective cutting action to ensure that the nerves are properly cut and the required part removed. Even in a frozen condition, the tool can be inserted and if necessary a hammering force can be applied onto the end face of the handle to drive the tool using the cutting edge into the required position.
Since various modifications can be made in my invention as herein above described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without department from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
Claims (8)
1. ~A tool for extracting at least a sample of the brain stem of an animal for testing comprising:
a metal body;
the metal body being formed from a metal tube;
a handle portion of the metal body being tubular to define a circular end face at one end of the metal body onto which hammering force can be applied;
and an operating portion of the metal body defining a blade and scoop for cutting the brain stem sample and carrying the brain stem sample from the animal;
the operating portion being defined by cutting an part of the cylinder defining the tube from the tube and along the length of the operating portion up to an end of the handle portion such that the operating portion is part cylindrical and integral with the handle part;
a part circular cutting end face of the operating portion and at least a part of the length of the side edges extending from the end face toward the handle portion of the operating portion being sharpened to form a cutting edge.
a metal body;
the metal body being formed from a metal tube;
a handle portion of the metal body being tubular to define a circular end face at one end of the metal body onto which hammering force can be applied;
and an operating portion of the metal body defining a blade and scoop for cutting the brain stem sample and carrying the brain stem sample from the animal;
the operating portion being defined by cutting an part of the cylinder defining the tube from the tube and along the length of the operating portion up to an end of the handle portion such that the operating portion is part cylindrical and integral with the handle part;
a part circular cutting end face of the operating portion and at least a part of the length of the side edges extending from the end face toward the handle portion of the operating portion being sharpened to form a cutting edge.
2. ~The tool according to Claim 1 wherein the operating portion tapers from the handle portion to the end face.
3. ~The tool according to Claim 1 wherein the operating portion tapers from the handle portion to the end face such that at the end of the handle portion the operating portion subtends and angle of the order of 180 degrees and at the cutting end face the operating portion subtends and angle of the order of degrees.
4. The tool according to Claim 1 wherein the side edges of the operating portion are sharpened approximately half way from the end cutting face to the handle portion.
5. A method for extracting at least a sample of the brain stem of an animal for testing comprising:
providing a metal body having;
the metal body being formed from a metal tube;
a handle portion of the metal body being tubular to define a circular end face at one end of the metal body onto which hammering force can be applied;~
and an operating portion of the metal body defining a blade and scoop for cutting the brain stem sample and carrying the brain stem sample from the animal;
the operating portion being defined by cutting an part of the cylinder defining the tube from the tube and along the length of the operating portion up to an end of the handle portion such that the operating portion is part cylindrical and integral with the handle part;
a part circular cutting end face of the operating portion and at least a part of the length of the side edges extending from the end face toward the handle portion of the operating portion being sharpened to form a cutting edge;
inserting the operating portion while holding the handle into the cranial cavity of the head of the animal through the foramen magnum;
rotating the tool to sever the cranial nerves;
and withdrawing the tool with the brain stem cradled in the operating portion.
providing a metal body having;
the metal body being formed from a metal tube;
a handle portion of the metal body being tubular to define a circular end face at one end of the metal body onto which hammering force can be applied;~
and an operating portion of the metal body defining a blade and scoop for cutting the brain stem sample and carrying the brain stem sample from the animal;
the operating portion being defined by cutting an part of the cylinder defining the tube from the tube and along the length of the operating portion up to an end of the handle portion such that the operating portion is part cylindrical and integral with the handle part;
a part circular cutting end face of the operating portion and at least a part of the length of the side edges extending from the end face toward the handle portion of the operating portion being sharpened to form a cutting edge;
inserting the operating portion while holding the handle into the cranial cavity of the head of the animal through the foramen magnum;
rotating the tool to sever the cranial nerves;
and withdrawing the tool with the brain stem cradled in the operating portion.
6. The method according to Claim 5 wherein the operating portion tapers from the handle portion to the end face.
7. The method according to Claim 5 wherein the operating portion tapers from the handle portion to the end face such that at the end of the handle portion the operating portion subtends and angle of the order of 180 degrees and at the cutting end face the operating portion subtends and angle of the order of degrees.
8. The method according to Claim 5 wherein the side edges of the operating portion are sharpened approximately half way from the end cutting face to the handle portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2499217 CA2499217A1 (en) | 2005-03-03 | 2005-03-03 | Surgical tool for removal of brain stem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2499217 CA2499217A1 (en) | 2005-03-03 | 2005-03-03 | Surgical tool for removal of brain stem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2499217A1 true CA2499217A1 (en) | 2006-09-03 |
Family
ID=36955276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2499217 Abandoned CA2499217A1 (en) | 2005-03-03 | 2005-03-03 | Surgical tool for removal of brain stem |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2499217A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103006345A (en) * | 2012-12-17 | 2013-04-03 | 中国人民解放军第四军医大学 | Brain taking device for simulating surgical injury |
-
2005
- 2005-03-03 CA CA 2499217 patent/CA2499217A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103006345A (en) * | 2012-12-17 | 2013-04-03 | 中国人民解放军第四军医大学 | Brain taking device for simulating surgical injury |
| CN103006345B (en) * | 2012-12-17 | 2015-07-29 | 中国人民解放军第四军医大学 | What a kind of sham operated damaged gets brain device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |